import {
  type ReactNode,
  useEffect,
  useState,
  useMemo,
  useCallback,
  useRef,
} from 'react'
import { useForm } from 'react-hook-form'
import { zodResolver } from '@hookform/resolvers/zod'
import { useQuery, useQueryClient } from '@tanstack/react-query'
import {
  ArrowRight,
  HelpCircle,
  Loader2,
  Sparkles,
  Trash2,
  Copy,
  FileText,
  Eraser,
  Plus,
  Eye,
  Link2,
  RefreshCw,
  ChevronDown,
  Code,
  Boxes,
  KeyRound,
  Route,
  Server,
  Settings,
  SlidersHorizontal,
  Wand2,
} from 'lucide-react'
import { useTranslation } from 'react-i18next'
import { toast } from 'sonner'
import { getLobeIcon } from '@/lib/lobe-icon'
import { cn } from '@/lib/utils'
import { useCopyToClipboard } from '@/hooks/use-copy-to-clipboard'
import { useHiddenClickUnlock } from '@/hooks/use-hidden-click-unlock'
import { Alert, AlertDescription } from '@/components/ui/alert'
import { Button } from '@/components/ui/button'
import {
  Collapsible,
  CollapsibleContent,
  CollapsibleTrigger,
} from '@/components/ui/collapsible'
import { Combobox } from '@/components/ui/combobox'
import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from '@/components/ui/form'
import { Input } from '@/components/ui/input'
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select'
import {
  Sheet,
  SheetClose,
  SheetContent,
  SheetDescription,
  SheetFooter,
  SheetHeader,
  SheetTitle,
} from '@/components/ui/sheet'
import { Skeleton } from '@/components/ui/skeleton'
import { Switch } from '@/components/ui/switch'
import { Textarea } from '@/components/ui/textarea'
import {
  Tooltip,
  TooltipContent,
  TooltipTrigger,
} from '@/components/ui/tooltip'
import { JsonEditor } from '@/components/json-editor'
import { MultiSelect } from '@/components/multi-select'
import {
  SecureVerificationDialog,
  useSecureVerification,
} from '@/features/auth/secure-verification'
import {
  createChannel,
  fetchModels,
  getAllModels,
  getChannel,
  getChannelKey,
  getGroups,
  getPrefillGroups,
  refreshCodexCredential,
  updateChannel,
} from '../../api'
import {
  ADD_MODE_OPTIONS,
  CHANNEL_TYPE_OPTIONS,
  CHANNEL_TYPE_WARNINGS,
  ERROR_MESSAGES,
  FIELD_DESCRIPTIONS,
  FIELD_PLACEHOLDERS,
  MODEL_FETCHABLE_TYPES,
  SUCCESS_MESSAGES,
} from '../../constants'
import {
  CHANNEL_FORM_DEFAULT_VALUES,
  channelFormSchema,
  channelsQueryKeys,
  transformChannelToFormDefaults,
  transformFormDataToCreatePayload,
  transformFormDataToUpdatePayload,
  type ChannelFormValues,
  deduplicateKeys,
  getChannelTypeIcon,
  getKeyPromptForType,
  parseModelsString,
  formatModelsArray,
  extractRedirectModels,
  extractMappingSourceModels,
  hasModelConfigChanged,
  findMissingModelsInMapping,
  validateModelMappingJson,
} from '../../lib'
import {
  collectInvalidStatusCodeEntries,
  collectNewDisallowedStatusCodeRedirects,
} from '../../lib/status-code-risk-guard'
import type { Channel } from '../../types'
import { useChannels } from '../channels-provider'
import { CodexOAuthDialog } from '../dialogs/codex-oauth-dialog'
import { FetchModelsDialog } from '../dialogs/fetch-models-dialog'
import {
  MissingModelsConfirmationDialog,
  type MissingModelsAction,
} from '../dialogs/missing-models-confirmation-dialog'
import { ParamOverrideEditorDialog } from '../dialogs/param-override-editor-dialog'
import { StatusCodeRiskDialog } from '../dialogs/status-code-risk-dialog'
import { ModelMappingEditor } from '../model-mapping-editor'

type ChannelMutateDrawerProps = {
  open: boolean
  onOpenChange: (open: boolean) => void
  currentRow?: Channel | null
}

type ModelMappingGuardrail = {
  invalidJson: boolean
  entries: Array<{ source: string; target: string }>
  missingSourceModels: string[]
  exposedTargetModels: string[]
}

function isRecord(value: unknown): value is Record<string, unknown> {
  return typeof value === 'object' && value !== null
}

function getErrorMessage(error: unknown): string | undefined {
  if (error instanceof Error && typeof error.message === 'string') {
    return error.message
  }

  if (!isRecord(error)) return undefined

  const response = error.response
  if (isRecord(response)) {
    const data = response.data
    if (isRecord(data)) {
      const message = data.message
      if (typeof message === 'string') return message
    }
  }

  const message = error.message
  if (typeof message === 'string') return message
  return undefined
}

// Helper functions
const createEmptyModelMappingGuardrail = (): ModelMappingGuardrail => ({
  invalidJson: false,
  entries: [],
  missingSourceModels: [],
  exposedTargetModels: [],
})

const formatModelNames = (models: string[]): string =>
  models.map((model) => `"${model}"`).join(', ')

const MODEL_MAPPING_PREVIEW_FALLBACK: Array<{
  source: string
  target: string
}> = [{ source: 'client-model', target: 'upstream-model' }]

const ADVANCED_SETTINGS_EXPANDED_KEY = 'channel-advanced-settings-expanded'
const UPSTREAM_DETECTED_MODEL_PREVIEW_LIMIT = 8

function readAdvancedSettingsPreference(): boolean {
  if (typeof window === 'undefined') return false
  return window.localStorage.getItem(ADVANCED_SETTINGS_EXPANDED_KEY) === 'true'
}

function hasAdvancedSettingsValues(values: ChannelFormValues): boolean {
  return Boolean(
    values.model_mapping?.trim() ||
    values.param_override?.trim() ||
    values.header_override?.trim() ||
    values.status_code_mapping?.trim() ||
    values.tag?.trim() ||
    values.remark?.trim() ||
    values.priority ||
    values.weight ||
    values.proxy?.trim() ||
    values.system_prompt?.trim() ||
    values.force_format ||
    values.thinking_to_content ||
    values.pass_through_body_enabled ||
    values.system_prompt_override ||
    values.claude_beta_query ||
    values.upstream_model_update_check_enabled ||
    values.upstream_model_update_auto_sync_enabled ||
    values.upstream_model_update_ignored_models?.trim()
  )
}

function parseSettingsRecord(
  settings: string | undefined
): Record<string, unknown> {
  if (!settings?.trim()) return {}
  try {
    const parsed = JSON.parse(settings)
    if (parsed && typeof parsed === 'object' && !Array.isArray(parsed)) {
      return parsed as Record<string, unknown>
    }
  } catch {
    return {}
  }
  return {}
}

function formatUnixTime(timestamp: unknown): string {
  const seconds = Number(timestamp)
  if (!Number.isFinite(seconds) || seconds <= 0) return '-'
  return new Date(seconds * 1000).toLocaleString()
}

function CardHeading({ title, icon }: { title: string; icon?: ReactNode }) {
  return (
    <div className='flex items-center gap-2.5'>
      {icon && (
        <span className='bg-primary/10 text-primary flex h-8 w-8 items-center justify-center rounded-lg'>
          {icon}
        </span>
      )}
      <h3 className='text-sm font-semibold tracking-tight'>{title}</h3>
    </div>
  )
}

function SubHeading({ title, icon }: { title: string; icon?: ReactNode }) {
  return (
    <div className='flex items-center gap-2'>
      {icon && <span className='text-muted-foreground'>{icon}</span>}
      <h4 className='text-muted-foreground text-xs font-medium tracking-wide uppercase'>
        {title}
      </h4>
    </div>
  )
}

export function ChannelMutateDrawer({
  open,
  onOpenChange,
  currentRow,
}: ChannelMutateDrawerProps) {
  const { t } = useTranslation()
  const queryClient = useQueryClient()
  const { setOpen } = useChannels()
  const [isSubmitting, setIsSubmitting] = useState(false)
  const [customModel, setCustomModel] = useState('')
  const [isFetchingModels, setIsFetchingModels] = useState(false)
  const [fetchModelsDialogOpen, setFetchModelsDialogOpen] = useState(false)
  const [channelKey, setChannelKey] = useState<string | null>(null)
  const [isChannelKeyLoading, setIsChannelKeyLoading] = useState(false)
  const [codexOAuthDialogOpen, setCodexOAuthDialogOpen] = useState(false)
  const [isCodexCredentialRefreshing, setIsCodexCredentialRefreshing] =
    useState(false)
  const initialModelsRef = useRef<string[]>([])
  const initialModelMappingRef = useRef<string>('')
  const initialStatusCodeMappingRef = useRef<string>('')
  const [statusCodeRiskOpen, setStatusCodeRiskOpen] = useState(false)
  const [statusCodeRiskDetailItems, setStatusCodeRiskDetailItems] = useState<
    string[]
  >([])
  const statusCodeRiskResolveRef = useRef<
    ((confirmed: boolean) => void) | null
  >(null)
  const [missingModelsDialogOpen, setMissingModelsDialogOpen] = useState(false)
  const [missingModelsList, setMissingModelsList] = useState<string[]>([])
  const missingModelsResolveRef = useRef<
    ((action: MissingModelsAction) => void) | null
  >(null)
  const [advancedSettingsOpen, setAdvancedSettingsOpen] = useState(false)
  const [paramOverrideEditorOpen, setParamOverrideEditorOpen] = useState(false)

  const isEditing = Boolean(currentRow)
  const channelId = currentRow?.id ?? null

  // Fetch channel details if editing
  const { data: channelData } = useQuery({
    queryKey: channelsQueryKeys.detail(currentRow?.id || 0),
    queryFn: () => getChannel(currentRow!.id),
    enabled: isEditing && Boolean(currentRow?.id),
  })

  // Fetch available groups
  const { data: groupsData, isLoading: isLoadingGroups } = useQuery({
    queryKey: ['groups'],
    queryFn: getGroups,
  })

  // Fetch all available models
  const { data: allModelsData } = useQuery({
    queryKey: ['channel_models'],
    queryFn: getAllModels,
  })

  // Fetch prefill model groups
  const { data: prefillGroupsData } = useQuery({
    queryKey: ['prefill_groups', 'model'],
    queryFn: () => getPrefillGroups('model'),
  })

  const { copyToClipboard } = useCopyToClipboard()

  const {
    open: verificationOpen,
    methods: verificationMethods,
    state: verificationState,
    executeVerification,
    withVerification,
    cancel: cancelVerification,
    setCode: setVerificationCode,
    switchMethod: switchVerificationMethod,
  } = useSecureVerification()

  useEffect(() => {
    if (!open) {
      setChannelKey(null)
      setIsChannelKeyLoading(false)
    } else if (channelId) {
      setChannelKey(null)
    }
  }, [open, channelId])

  // Check if this is a multi-key channel
  const isMultiKeyChannel =
    isEditing && channelData?.data?.channel_info?.is_multi_key === true

  // Form setup
  const form = useForm<ChannelFormValues>({
    resolver: zodResolver(channelFormSchema),
    defaultValues: CHANNEL_FORM_DEFAULT_VALUES,
  })

  // Watch form values for conditional rendering
  const multiKeyMode = form.watch('multi_key_mode')
  const multiKeyType = form.watch('multi_key_type')
  const keyMode = form.watch('key_mode')
  const currentGroups = form.watch('group')
  const currentType = form.watch('type')
  const currentBaseUrl = form.watch('base_url')
  const currentModels = form.watch('models')
  const currentModelMapping = form.watch('model_mapping')
  const awsKeyType = form.watch('aws_key_type')
  const upstreamModelUpdateCheckEnabled = form.watch(
    'upstream_model_update_check_enabled'
  )
  const currentSettings = form.watch('settings')
  const {
    unlocked: doubaoApiEditUnlocked,
    handleClick: handleApiConfigSecretClick,
    reset: resetDoubaoApiUnlock,
  } = useHiddenClickUnlock({
    requiredClicks: 10,
    disabled: currentType !== 45,
    onUnlock: () => {
      toast.info(t('Doubao custom API address editing unlocked'))
    },
  })

  useEffect(() => {
    if (!open) {
      resetDoubaoApiUnlock()
    }
  }, [open, resetDoubaoApiUnlock])

  // Helper computed values
  const isBatchMode =
    multiKeyMode === 'batch' || multiKeyMode === 'multi_to_single'

  // Get all models list
  const allModelsList = useMemo(
    () => allModelsData?.data?.map((model) => model.id).filter(Boolean) || [],
    [allModelsData]
  )

  // Get basic models for the current channel type
  const basicModels = useMemo(() => {
    if (!allModelsList.length) return []
    // Filter models based on common patterns for specific types
    if (currentType === 1) {
      return allModelsList.filter(
        (model) => model.startsWith('gpt-') || model.startsWith('text-')
      )
    }
    return allModelsList
  }, [allModelsList, currentType])

  // Get prefill groups
  const prefillGroups = useMemo(
    () => prefillGroupsData?.data || [],
    [prefillGroupsData]
  )

  // Transform groups to multi-select options
  const groupOptions = useMemo(() => {
    if (!groupsData?.data) return []
    const allGroups = new Set([...groupsData.data, ...(currentGroups || [])])
    return Array.from(allGroups).map((group) => ({
      value: group,
      label: group,
    }))
  }, [groupsData, currentGroups])

  // Parse current models as array
  const currentModelsArray = useMemo(
    () => parseModelsString(currentModels),
    [currentModels]
  )

  const currentTypeLabel = useMemo(
    () =>
      CHANNEL_TYPE_OPTIONS.find((option) => option.value === currentType)
        ?.label || `#${currentType}`,
    [currentType]
  )

  const channelTypeOptions = useMemo(() => {
    const options = CHANNEL_TYPE_OPTIONS.map((option) => ({
      value: String(option.value),
      label: t(option.label),
      icon: getLobeIcon(`${getChannelTypeIcon(option.value)}.Color`, 16),
    }))
    if (!options.some((option) => Number(option.value) === currentType)) {
      options.push({
        value: String(currentType),
        label: `#${currentType}`,
        icon: getLobeIcon(`${getChannelTypeIcon(currentType)}.Color`, 16),
      })
    }
    return options
  }, [currentType, t])

  // Extract redirect models from model_mapping (target values)
  const redirectModelList = useMemo(
    () => extractRedirectModels(currentModelMapping || ''),
    [currentModelMapping]
  )

  // Extract source keys from model_mapping (models being remapped FROM)
  const redirectModelKeyList = useMemo(
    () => extractMappingSourceModels(currentModelMapping || ''),
    [currentModelMapping]
  )

  // Transform models to multi-select options
  const modelOptions = useMemo(() => {
    const allModels = new Set([...allModelsList, ...currentModelsArray])
    return Array.from(allModels).map((model) => ({
      value: model,
      label: model,
    }))
  }, [allModelsList, currentModelsArray])

  const modelMappingGuardrail = useMemo<ModelMappingGuardrail>(() => {
    if (!currentModelMapping?.trim()) {
      return createEmptyModelMappingGuardrail()
    }

    try {
      const parsed = JSON.parse(currentModelMapping)
      if (!parsed || typeof parsed !== 'object' || Array.isArray(parsed)) {
        return { ...createEmptyModelMappingGuardrail(), invalidJson: true }
      }

      const entries = Object.entries(parsed).reduce<
        Array<{ source: string; target: string }>
      >((acc, [rawSource, rawTarget]) => {
        const source = String(rawSource).trim()
        const target = String(rawTarget ?? '').trim()

        if (!source || !target) {
          return acc
        }

        acc.push({ source, target })
        return acc
      }, [])

      const missingSourceModels = Array.from(
        new Set(
          entries
            .filter(
              (entry) =>
                Boolean(entry.source) &&
                !currentModelsArray.includes(entry.source)
            )
            .map((entry) => entry.source)
        )
      )

      const exposedTargetModels = Array.from(
        new Set(
          entries
            .filter(
              (entry) =>
                Boolean(entry.target) &&
                currentModelsArray.includes(entry.target)
            )
            .map((entry) => entry.target)
        )
      )

      return {
        invalidJson: false,
        entries,
        missingSourceModels,
        exposedTargetModels,
      }
    } catch {
      return { ...createEmptyModelMappingGuardrail(), invalidJson: true }
    }
  }, [currentModelMapping, currentModelsArray])

  const mappingPreviewPairs =
    modelMappingGuardrail.entries.length > 0
      ? modelMappingGuardrail.entries.slice(0, 3)
      : MODEL_MAPPING_PREVIEW_FALLBACK
  const remainingMappingCount =
    modelMappingGuardrail.entries.length > 3
      ? modelMappingGuardrail.entries.length - 3
      : 0

  const upstreamUpdateMeta = useMemo(() => {
    const settings = parseSettingsRecord(currentSettings)
    const detectedModels = Array.isArray(
      settings.upstream_model_update_last_detected_models
    )
      ? settings.upstream_model_update_last_detected_models
          .map((model) => String(model || '').trim())
          .filter(Boolean)
      : []

    return {
      lastCheckTime: settings.upstream_model_update_last_check_time,
      detectedModels: Array.from(new Set(detectedModels)),
    }
  }, [currentSettings])

  const upstreamDetectedModelsPreview = upstreamUpdateMeta.detectedModels.slice(
    0,
    UPSTREAM_DETECTED_MODEL_PREVIEW_LIMIT
  )
  const upstreamDetectedModelsOmittedCount =
    upstreamUpdateMeta.detectedModels.length -
    upstreamDetectedModelsPreview.length

  // Load channel data into form when editing
  useEffect(() => {
    if (isEditing && channelData?.data) {
      const defaults = transformChannelToFormDefaults(channelData.data)
      form.reset(defaults)
      setAdvancedSettingsOpen(
        readAdvancedSettingsPreference() || hasAdvancedSettingsValues(defaults)
      )
      // Store initial values for comparison
      initialModelsRef.current = parseModelsString(
        channelData.data.models || ''
      )
      initialModelMappingRef.current = channelData.data.model_mapping || ''
      initialStatusCodeMappingRef.current =
        channelData.data.status_code_mapping || ''
    } else if (!isEditing) {
      form.reset(CHANNEL_FORM_DEFAULT_VALUES)
      setAdvancedSettingsOpen(false)
      initialModelsRef.current = []
      initialModelMappingRef.current = ''
      initialStatusCodeMappingRef.current = ''
    }
  }, [isEditing, channelData, form])

  // Handle type change - set default values for specific types
  useEffect(() => {
    if (isEditing) return // Don't auto-set defaults when editing

    // Type 45 (VolcEngine) - set default base_url
    if (currentType === 45) {
      const currentBaseUrlValue = form.getValues('base_url')
      if (!currentBaseUrlValue || currentBaseUrlValue === '') {
        form.setValue('base_url', 'https://ark.cn-beijing.volces.com')
      }
    }

    // Type 18 (Xunfei) - set default other (version)
    if (currentType === 18) {
      const currentOther = form.getValues('other')
      if (!currentOther || currentOther === '') {
        form.setValue('other', 'v2.1')
      }
    }
  }, [currentType, isEditing, form])

  // Validate base_url - warn if it ends with /v1
  useEffect(() => {
    if (!currentBaseUrl || !currentBaseUrl.endsWith('/v1')) return

    // Show warning toast
    const timer = setTimeout(() => {
      toast.warning(
        t(
          'Warning: Base URL should not end with /v1. New API will handle it automatically. This may cause request failures.'
        ),
        { duration: 5000 }
      )
    }, 500)

    return () => clearTimeout(timer)
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [currentBaseUrl])

  // Handle key deduplication
  const handleDeduplicateKeys = () => {
    const currentKey = form.getValues('key')
    if (!currentKey || currentKey.trim() === '') {
      toast.info(t('Please enter keys first'))
      return
    }

    const result = deduplicateKeys(currentKey)

    if (result.removedCount === 0) {
      toast.info(t('No duplicate keys found'))
    } else {
      form.setValue('key', result.deduplicatedText)
      toast.success(
        t(
          'Removed {{removed}} duplicate key(s). Before: {{before}}, After: {{after}}',
          {
            removed: result.removedCount,
            before: result.beforeCount,
            after: result.afterCount,
          }
        )
      )
    }
  }

  const fetchChannelKey = useCallback(async () => {
    if (!channelId) {
      throw new Error('Channel is not selected')
    }

    setIsChannelKeyLoading(true)
    try {
      const res = await getChannelKey(channelId)
      if (!res.success) {
        throw new Error(res.message || 'Failed to fetch channel key')
      }

      const keyValue = res.data?.key ?? ''
      setChannelKey(keyValue)
      toast.success(t('Channel key unlocked'))
      return res
    } finally {
      setIsChannelKeyLoading(false)
    }
  }, [channelId, t])

  const handleRevealKey = useCallback(async () => {
    if (!channelId) return

    try {
      await withVerification(fetchChannelKey, {
        preferredMethod: 'passkey',
        title: 'Verify to view channel key',
        description:
          'Use Passkey or 2FA to confirm your identity before revealing this channel key.',
      })
    } catch (error) {
      if (error instanceof Error) {
        toast.error(error.message)
      }
    }
  }, [channelId, withVerification, fetchChannelKey])

  const handleRefreshCodexCredential = useCallback(async () => {
    if (!channelId) return
    setIsCodexCredentialRefreshing(true)
    try {
      const res = await refreshCodexCredential(channelId)
      if (!res.success) {
        throw new Error(res.message || 'Failed to refresh credential')
      }
      toast.success(t('Credential refreshed'))
      queryClient.invalidateQueries({
        queryKey: channelsQueryKeys.detail(channelId),
      })
    } catch (error) {
      toast.error(error instanceof Error ? error.message : t('Refresh failed'))
    } finally {
      setIsCodexCredentialRefreshing(false)
    }
  }, [channelId, queryClient, t])

  // Unified function to update models
  const updateModels = useCallback(
    (newModels: string[], merge: boolean = false) => {
      const finalModels = merge
        ? formatModelsArray([...currentModelsArray, ...newModels])
        : formatModelsArray(newModels)
      form.setValue('models', finalModels)
      return newModels.length
    },
    [currentModelsArray, form]
  )

  // Handle fetching models from upstream
  const handleFetchModels = useCallback(async () => {
    const type = form.getValues('type')

    if (!MODEL_FETCHABLE_TYPES.has(type)) {
      toast.error(t('This channel type does not support fetching models'))
      return
    }

    // For editing mode, open FetchModelsDialog to let user select
    if (isEditing && currentRow) {
      setFetchModelsDialogOpen(true)
      return
    }

    // For creation mode, fetch and fill all models
    const key = form.getValues('key')
    if (!key?.trim()) {
      toast.error(t('Please enter API key first'))
      return
    }

    setIsFetchingModels(true)
    try {
      const response = await fetchModels({
        type,
        key,
        base_url: form.getValues('base_url') || '',
      })

      if (response.success && response.data) {
        updateModels(response.data, true)
        toast.success(
          t('Fetched {{count}} model(s) from upstream', {
            count: response.data.length,
          })
        )
      } else {
        toast.error(t('No models fetched from upstream'))
      }
    } catch (error: unknown) {
      toast.error(getErrorMessage(error) || t('Failed to fetch models'))
    } finally {
      setIsFetchingModels(false)
    }
  }, [isEditing, currentRow, form, t, updateModels])

  // Handle adding custom models
  const handleAddCustomModels = useCallback(() => {
    if (!customModel?.trim()) return

    const modelArray = parseModelsString(customModel)
    const count = updateModels(modelArray, true)
    setCustomModel('')
    toast.success(t('Added {{count}} custom model(s)', { count }))
  }, [customModel, t, updateModels])

  // Handle model operations
  const handleFillRelatedModels = useCallback(() => {
    if (!basicModels.length) {
      toast.info(t('No related models available for this channel type'))
      return
    }
    updateModels(basicModels)
    toast.success(
      t('Filled {{count}} related model(s)', { count: basicModels.length })
    )
  }, [basicModels, updateModels, t])

  const handleFillAllModels = useCallback(() => {
    if (!allModelsList.length) {
      toast.info(t('No models available'))
      return
    }
    updateModels(allModelsList)
    toast.success(
      t('Filled {{count}} model(s)', { count: allModelsList.length })
    )
  }, [allModelsList, updateModels, t])

  const handleClearModels = useCallback(() => {
    form.setValue('models', '')
    toast.success(t('Cleared all models'))
  }, [form, t])

  const handleCopyModels = useCallback(async () => {
    const models = form.getValues('models')
    if (!models?.trim()) {
      toast.info(t('No models to copy'))
      return
    }
    await copyToClipboard(models)
  }, [form, copyToClipboard, t])

  // Handle adding prefill group models
  const handleAddPrefillGroup = useCallback(
    (group: { id: number; name: string; items: string | string[] }) => {
      try {
        const items = Array.isArray(group.items)
          ? group.items
          : JSON.parse(group.items)

        if (!Array.isArray(items)) {
          throw new Error('Invalid items format')
        }

        const count = updateModels(items, true)
        toast.success(
          t('Added {{count}} models from "{{name}}"', {
            count,
            name: group.name,
          })
        )
      } catch {
        toast.error(t('Failed to parse group items'))
      }
    },
    [updateModels, t]
  )

  // Handle model selection change from MultiSelect
  const handleModelsChange = useCallback(
    (selected: string[]) => {
      form.setValue('models', selected.join(','))
    },
    [form]
  )

  // Handle successful submission
  const handleSuccess = useCallback(() => {
    queryClient.invalidateQueries({ queryKey: channelsQueryKeys.lists() })
    onOpenChange(false)
    setOpen(null)
  }, [queryClient, onOpenChange, setOpen])

  // Show missing models confirmation dialog
  const confirmMissingModelMappings = useCallback(
    (missingModels: string[]): Promise<MissingModelsAction> => {
      return new Promise((resolve) => {
        setMissingModelsList(missingModels)
        setMissingModelsDialogOpen(true)
        missingModelsResolveRef.current = resolve
      })
    },
    []
  )

  // Handle missing models dialog action
  const handleMissingModelsAction = useCallback(
    (action: MissingModelsAction) => {
      setMissingModelsDialogOpen(false)
      if (missingModelsResolveRef.current) {
        missingModelsResolveRef.current(action)
        missingModelsResolveRef.current = null
      }
    },
    []
  )

  const confirmStatusCodeRisk = useCallback(
    (detailItems: string[]): Promise<boolean> =>
      new Promise((resolve) => {
        statusCodeRiskResolveRef.current = resolve
        setStatusCodeRiskDetailItems(detailItems)
        setStatusCodeRiskOpen(true)
      }),
    []
  )

  const handleStatusCodeRiskAction = useCallback((confirmed: boolean) => {
    setStatusCodeRiskOpen(false)
    setStatusCodeRiskDetailItems([])
    if (statusCodeRiskResolveRef.current) {
      statusCodeRiskResolveRef.current(confirmed)
      statusCodeRiskResolveRef.current = null
    }
  }, [])

  useEffect(() => {
    return () => {
      if (statusCodeRiskResolveRef.current) {
        statusCodeRiskResolveRef.current(false)
        statusCodeRiskResolveRef.current = null
      }
    }
  }, [])

  // Submit handler
  const onSubmit = useCallback(
    async (data: ChannelFormValues) => {
      // Validate key is required when creating
      if (!isEditing && !data.key?.trim()) {
        form.setError('key', {
          type: 'manual',
          message: 'API key is required',
        })
        return
      }

      // Validate status_code_mapping entries
      if (data.status_code_mapping?.trim()) {
        const invalidEntries = collectInvalidStatusCodeEntries(
          data.status_code_mapping
        )
        if (invalidEntries.length > 0) {
          toast.error(
            t('Invalid status code mapping entries: {{entries}}', {
              entries: invalidEntries.join(', '),
            })
          )
          return
        }

        const riskyRedirects = collectNewDisallowedStatusCodeRedirects(
          initialStatusCodeMappingRef.current,
          data.status_code_mapping
        )
        if (riskyRedirects.length > 0) {
          const confirmed = await confirmStatusCodeRisk(riskyRedirects)
          if (!confirmed) return
        }
      }

      // Validate model_mapping JSON format
      const hasModelMapping =
        typeof data.model_mapping === 'string' &&
        data.model_mapping.trim() !== ''

      if (hasModelMapping) {
        const validation = validateModelMappingJson(data.model_mapping!)
        if (!validation.valid) {
          toast.error(t(validation.error || 'Invalid model mapping'))
          return
        }
      }

      // Normalize models array
      const normalizedModels = parseModelsString(data.models || '')

      // Check for missing models in model_mapping
      if (hasModelMapping) {
        const missingModels = findMissingModelsInMapping(
          data.model_mapping!,
          normalizedModels
        )

        const shouldPromptMissing =
          missingModels.length > 0 &&
          hasModelConfigChanged(
            normalizedModels,
            data.model_mapping || '',
            initialModelsRef.current,
            initialModelMappingRef.current
          )

        if (shouldPromptMissing) {
          const confirmAction = await confirmMissingModelMappings(missingModels)
          if (confirmAction === 'cancel') {
            return
          }
          if (confirmAction === 'add') {
            const updatedModels = Array.from(
              new Set([...normalizedModels, ...missingModels])
            )
            data.models = formatModelsArray(updatedModels)
            form.setValue('models', data.models)
          }
        }
      }

      setIsSubmitting(true)
      try {
        if (isEditing && currentRow) {
          // Update existing channel
          const payload = transformFormDataToUpdatePayload(data, currentRow.id)
          const payloadWithKeyMode =
            isMultiKeyChannel && data.key_mode
              ? {
                  ...payload,
                  key_mode: data.key_mode,
                }
              : payload

          const response = await updateChannel(
            currentRow.id,
            payloadWithKeyMode
          )
          if (response.success) {
            toast.success(t(SUCCESS_MESSAGES.UPDATED))
            handleSuccess()
          }
        } else {
          // Create new channel(s)
          const payload = transformFormDataToCreatePayload(data)
          const response = await createChannel(payload)
          if (response.success) {
            toast.success(t(SUCCESS_MESSAGES.CREATED))
            handleSuccess()
          }
        }
      } catch (error: unknown) {
        toast.error(getErrorMessage(error) || t(ERROR_MESSAGES.CREATE_FAILED))
      } finally {
        setIsSubmitting(false)
      }
    },
    [
      isEditing,
      currentRow,
      isMultiKeyChannel,
      form,
      handleSuccess,
      confirmMissingModelMappings,
      confirmStatusCodeRisk,
      t,
    ]
  )

  // Handle drawer close
  const handleOpenChange = useCallback(
    (v: boolean) => {
      onOpenChange(v)
      if (!v) {
        form.reset(CHANNEL_FORM_DEFAULT_VALUES)
        setAdvancedSettingsOpen(false)
      }
    },
    [onOpenChange, form]
  )

  const handleAdvancedSettingsOpenChange = useCallback((nextOpen: boolean) => {
    setAdvancedSettingsOpen(nextOpen)
    if (typeof window !== 'undefined') {
      window.localStorage.setItem(
        ADVANCED_SETTINGS_EXPANDED_KEY,
        String(nextOpen)
      )
    }
  }, [])

  return (
    <>
      <Sheet open={open} onOpenChange={handleOpenChange}>
        <SheetContent className='flex h-dvh w-full flex-col gap-0 overflow-hidden p-0 sm:max-w-3xl'>
          <SheetHeader className='border-b px-4 py-3 text-start sm:px-6 sm:py-4'>
            <SheetTitle className='flex items-center gap-3'>
              <span className='bg-muted flex h-9 w-9 shrink-0 items-center justify-center rounded-xl border'>
                {getLobeIcon(`${getChannelTypeIcon(currentType)}.Color`, 22)}
              </span>
              <span>
                {isEditing ? t('Edit Channel') : t('Create Channel')}
                <span className='text-muted-foreground ml-2 text-sm font-normal'>
                  {t(currentTypeLabel)}
                </span>
              </span>
            </SheetTitle>
            <SheetDescription>
              {isEditing
                ? t(
                    "Update channel configuration and click save when you're done."
                  )
                : t(
                    'Add a new channel by providing the necessary information.'
                  )}
            </SheetDescription>
          </SheetHeader>

          <Form {...form}>
            <form
              id='channel-form'
              onSubmit={form.handleSubmit(onSubmit)}
              className='flex-1 space-y-4 overflow-y-auto px-3 py-3 pb-4 sm:space-y-5 sm:px-4'
            >
              {/* ── Basic Information ── */}
              <div className='bg-card space-y-4 rounded-xl border p-3 sm:p-5'>
                <CardHeading
                  title={t('Basic Information')}
                  icon={<Server className='h-4 w-4' />}
                />
                <div className='grid gap-4 sm:grid-cols-2'>
                  <FormField
                    control={form.control}
                    name='name'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('Name *')}</FormLabel>
                        <FormControl>
                          <Input
                            placeholder={t(FIELD_PLACEHOLDERS.NAME)}
                            {...field}
                          />
                        </FormControl>
                        <FormMessage />
                      </FormItem>
                    )}
                  />

                  <FormField
                    control={form.control}
                    name='type'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('Type *')}</FormLabel>
                        <FormControl>
                          <Combobox
                            options={channelTypeOptions}
                            value={String(field.value)}
                            onValueChange={(value) => {
                              const nextType = Number(value)
                              if (Number.isInteger(nextType) && nextType > 0) {
                                field.onChange(nextType)
                              }
                            }}
                            placeholder={t('Select channel type')}
                            searchPlaceholder={t('Search channel type...')}
                            emptyText={t('No channel type found.')}
                            allowCustomValue
                          />
                        </FormControl>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                </div>

                <FormField
                  control={form.control}
                  name='status'
                  render={({ field }) => (
                    <FormItem className='flex items-center justify-between rounded-lg border px-4 py-3'>
                      <div className='space-y-0.5'>
                        <FormLabel>{t('Enabled')}</FormLabel>
                        <FormDescription className='text-xs'>
                          {t('Enable or disable this channel')}
                        </FormDescription>
                      </div>
                      <FormControl>
                        <Switch
                          checked={field.value === 1}
                          onCheckedChange={(checked) =>
                            field.onChange(checked ? 1 : 2)
                          }
                        />
                      </FormControl>
                    </FormItem>
                  )}
                />

                {currentType === 1 && (
                  <FormField
                    control={form.control}
                    name='openai_organization'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('OpenAI Organization')}</FormLabel>
                        <FormControl>
                          <Input placeholder={t('org-...')} {...field} />
                        </FormControl>
                        <FormDescription>
                          {t(FIELD_DESCRIPTIONS.OPENAI_ORG)}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}
              </div>

              {/* ── API Access ── */}
              <div className='bg-card space-y-4 rounded-xl border p-5'>
                <CardHeading
                  title={t('API Access')}
                  icon={<Link2 className='h-4 w-4' />}
                />
                {CHANNEL_TYPE_WARNINGS[currentType] && (
                  <Alert>
                    <AlertDescription>
                      {t(CHANNEL_TYPE_WARNINGS[currentType])}
                    </AlertDescription>
                  </Alert>
                )}

                {/* Azure (type 3) */}
                {currentType === 3 && (
                  <>
                    <FormField
                      control={form.control}
                      name='base_url'
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>{t('AZURE_OPENAI_ENDPOINT *')}</FormLabel>
                          <FormControl>
                            <Input
                              placeholder={t(
                                'e.g., https://docs-test-001.openai.azure.com'
                              )}
                              {...field}
                            />
                          </FormControl>
                          <FormDescription>
                            {t('Your Azure OpenAI endpoint URL')}
                          </FormDescription>
                          <FormMessage />
                        </FormItem>
                      )}
                    />
                    <FormField
                      control={form.control}
                      name='other'
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>{t('Default API Version *')}</FormLabel>
                          <FormControl>
                            <Input
                              placeholder={t('e.g., 2025-04-01-preview')}
                              {...field}
                            />
                          </FormControl>
                          <FormDescription>
                            {t('Default API version for this channel')}
                          </FormDescription>
                          <FormMessage />
                        </FormItem>
                      )}
                    />
                    <FormField
                      control={form.control}
                      name='azure_responses_version'
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>{t('Responses API Version')}</FormLabel>
                          <FormControl>
                            <Input
                              placeholder={t('e.g., preview')}
                              {...field}
                            />
                          </FormControl>
                          <FormDescription>
                            {t(
                              'Default Responses API version, if empty, will use the API version above'
                            )}
                          </FormDescription>
                          <FormMessage />
                        </FormItem>
                      )}
                    />
                  </>
                )}

                {/* Custom (type 8) */}
                {currentType === 8 && (
                  <FormField
                    control={form.control}
                    name='base_url'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>
                          {t('Full Base URL (supports')} {'{'}
                          {t('model')}
                          {'}'} {t('variable) *')}
                        </FormLabel>
                        <FormControl>
                          <Input
                            placeholder={t(
                              'e.g., https://api.openai.com/v1/chat/completions'
                            )}
                            {...field}
                          />
                        </FormControl>
                        <FormDescription>
                          {t('Enter the complete URL, supports')} {'{'}
                          {t('model')}
                          {'}'} {t('variable')}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}

                {/* Xunfei/Spark (type 18) */}
                {currentType === 18 && (
                  <FormField
                    control={form.control}
                    name='other'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('Model Version *')}</FormLabel>
                        <FormControl>
                          <Input placeholder={t('e.g., v2.1')} {...field} />
                        </FormControl>
                        <FormDescription>
                          {t(
                            'Spark model version, e.g., v2.1 (version number in API URL)'
                          )}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}

                {/* OpenRouter (type 20) */}
                {currentType === 20 && (
                  <FormField
                    control={form.control}
                    name='is_enterprise_account'
                    render={({ field }) => (
                      <FormItem className='flex items-center justify-between'>
                        <div className='space-y-0.5'>
                          <FormLabel>{t('Enterprise Account')}</FormLabel>
                          <FormDescription>
                            {t(
                              'Enable if this is an OpenRouter enterprise account with special response format'
                            )}
                          </FormDescription>
                        </div>
                        <FormControl>
                          <Switch
                            checked={field.value}
                            onCheckedChange={field.onChange}
                          />
                        </FormControl>
                      </FormItem>
                    )}
                  />
                )}

                {/* AWS (type 33) */}
                {currentType === 33 && (
                  <FormField
                    control={form.control}
                    name='aws_key_type'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('AWS Key Format')}</FormLabel>
                        <Select
                          onValueChange={field.onChange}
                          value={field.value}
                        >
                          <FormControl>
                            <SelectTrigger>
                              <SelectValue
                                placeholder={t('Select key format')}
                              />
                            </SelectTrigger>
                          </FormControl>
                          <SelectContent>
                            <SelectItem value='ak_sk'>
                              {t('AccessKey / SecretAccessKey')}
                            </SelectItem>
                            <SelectItem value='api_key'>
                              {t('API Key')}
                            </SelectItem>
                          </SelectContent>
                        </Select>
                        <FormDescription>
                          {field.value === 'api_key'
                            ? t('API Key mode: use APIKey|Region')
                            : t(
                                'AK/SK mode: use AccessKey|SecretAccessKey|Region'
                              )}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}

                {/* AI Proxy Library (type 21) */}
                {currentType === 21 && (
                  <FormField
                    control={form.control}
                    name='other'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('Knowledge Base ID *')}</FormLabel>
                        <FormControl>
                          <Input placeholder={t('e.g., 123456')} {...field} />
                        </FormControl>
                        <FormDescription>
                          {t('Enter the knowledge base ID')}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}

                {/* FastGPT (type 22) */}
                {currentType === 22 && (
                  <FormField
                    control={form.control}
                    name='base_url'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('Private Deployment URL')}</FormLabel>
                        <FormControl>
                          <Input
                            placeholder={t(
                              'e.g., https://fastgpt.run/api/openapi'
                            )}
                            {...field}
                          />
                        </FormControl>
                        <FormDescription>
                          {t(
                            'For private deployments, format: https://fastgpt.run/api/openapi'
                          )}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}

                {/* SunoAPI (type 36) */}
                {currentType === 36 && (
                  <FormField
                    control={form.control}
                    name='base_url'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>
                          {t('API Base URL (Important: Not Chat API) *')}
                        </FormLabel>
                        <FormControl>
                          <Input
                            placeholder={t(
                              'e.g., https://api.example.com (path before /suno)'
                            )}
                            {...field}
                          />
                        </FormControl>
                        <FormDescription>
                          {t(
                            'Enter the path before /suno, usually just the domain'
                          )}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}

                {/* Cloudflare Workers AI (type 39) */}
                {currentType === 39 && (
                  <FormField
                    control={form.control}
                    name='other'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('Account ID *')}</FormLabel>
                        <FormControl>
                          <Input
                            placeholder={t('e.g., d6b5da8hk1awo8nap34ube6gh')}
                            {...field}
                          />
                        </FormControl>
                        <FormDescription>
                          {t('Your Cloudflare Account ID')}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}

                {/* SiliconFlow (type 40) */}
                {currentType === 40 && (
                  <Alert>
                    <AlertDescription>
                      {t('Referral link:')}{' '}
                      <a
                        href='https://cloud.siliconflow.cn/i/hij0YNTZ'
                        target='_blank'
                        rel='noopener noreferrer'
                        className='text-primary underline'
                      >
                        {t('https://cloud.siliconflow.cn/i/hij0YNTZ')}
                      </a>
                    </AlertDescription>
                  </Alert>
                )}

                {/* Vertex AI (type 41) */}
                {currentType === 41 && (
                  <>
                    <FormField
                      control={form.control}
                      name='vertex_key_type'
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>{t('Vertex AI Key Format')}</FormLabel>
                          <Select
                            onValueChange={field.onChange}
                            value={field.value}
                          >
                            <FormControl>
                              <SelectTrigger>
                                <SelectValue />
                              </SelectTrigger>
                            </FormControl>
                            <SelectContent>
                              <SelectItem value='json'>{t('JSON')}</SelectItem>
                              <SelectItem value='api_key'>
                                {t('API Key')}
                              </SelectItem>
                            </SelectContent>
                          </Select>
                          <FormDescription>
                            {field.value === 'json'
                              ? t(
                                  'JSON format supports service account JSON files'
                                )
                              : t(
                                  'API Key mode (does not support batch creation)'
                                )}
                          </FormDescription>
                          <FormMessage />
                        </FormItem>
                      )}
                    />
                    {form.watch('vertex_key_type') === 'json' && (
                      <FormItem>
                        <FormLabel>
                          {t('Service account JSON file(s)')}
                        </FormLabel>
                        <FormControl>
                          <Input
                            type='file'
                            accept='.json,application/json'
                            multiple={isBatchMode}
                            onChange={async (e) => {
                              const fileList = e.target.files
                              const files = fileList ? Array.from(fileList) : []
                              // allow re-selecting the same file
                              e.target.value = ''

                              if (files.length === 0) {
                                toast.info(t('Please upload key file(s)'))
                                return
                              }

                              const keys: unknown[] = []
                              for (const file of files) {
                                try {
                                  const txt = await file.text()
                                  keys.push(JSON.parse(txt))
                                } catch {
                                  toast.error(
                                    t('Failed to parse JSON file: {{name}}', {
                                      name: file.name,
                                    })
                                  )
                                  return
                                }
                              }

                              if (keys.length === 0) {
                                toast.info(t('Please upload key file(s)'))
                                return
                              }

                              const keyValue = isBatchMode
                                ? JSON.stringify(keys)
                                : JSON.stringify(keys[0])

                              form.setValue('key', keyValue, {
                                shouldDirty: true,
                                shouldValidate: true,
                              })

                              toast.success(
                                t('Parsed {{count}} service account file(s)', {
                                  count: keys.length,
                                })
                              )
                            }}
                          />
                        </FormControl>
                        <FormDescription>
                          {isBatchMode
                            ? t('Upload multiple JSON files in batch modes')
                            : t('Upload a single service account JSON file')}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                    <FormField
                      control={form.control}
                      name='other'
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>{t('Deployment Region *')}</FormLabel>
                          <FormControl>
                            <Textarea
                              placeholder={t(
                                'e.g., us-central1 or JSON format for model-specific regions'
                              )}
                              rows={3}
                              {...field}
                            />
                          </FormControl>
                          <FormDescription>
                            {t('Enter deployment region or JSON mapping:')}{' '}
                            {'{'}
                            {t(
                              '"default": "us-central1", "claude-3-5-sonnet-20240620": "europe-west1"'
                            )}
                            {'}'}
                          </FormDescription>
                          <FormMessage />
                        </FormItem>
                      )}
                    />
                  </>
                )}

                {/* VolcEngine (type 45) */}
                {currentType === 45 && !doubaoApiEditUnlocked && (
                  <FormField
                    control={form.control}
                    name='base_url'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel
                          className='cursor-pointer select-none'
                          onClick={handleApiConfigSecretClick}
                        >
                          {t('API Base URL *')}
                        </FormLabel>
                        <Select
                          onValueChange={field.onChange}
                          value={
                            field.value || 'https://ark.cn-beijing.volces.com'
                          }
                        >
                          <FormControl>
                            <SelectTrigger>
                              <SelectValue />
                            </SelectTrigger>
                          </FormControl>
                          <SelectContent>
                            <SelectItem value='https://ark.cn-beijing.volces.com'>
                              {t('https://ark.cn-beijing.volces.com')}
                            </SelectItem>
                            <SelectItem value='https://ark.ap-southeast.bytepluses.com'>
                              {t('https://ark.ap-southeast.bytepluses.com')}
                            </SelectItem>
                            <SelectItem value='doubao-coding-plan'>
                              {t('Doubao Coding Plan')}
                            </SelectItem>
                          </SelectContent>
                        </Select>
                        <FormDescription>
                          {t('Select the API endpoint region')}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}

                {/* VolcEngine (type 45) - Custom API URL (unlocked) */}
                {currentType === 45 && doubaoApiEditUnlocked && (
                  <FormField
                    control={form.control}
                    name='base_url'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('API Base URL *')}</FormLabel>
                        <FormControl>
                          <Input
                            placeholder={t(
                              'e.g., https://ark.cn-beijing.volces.com'
                            )}
                            {...field}
                          />
                        </FormControl>
                        <FormDescription>
                          {t('Enter custom API endpoint URL')}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}

                {/* Coze (type 49) */}
                {currentType === 49 && (
                  <FormField
                    control={form.control}
                    name='other'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('Agent ID *')}</FormLabel>
                        <FormControl>
                          <Input
                            placeholder={t('e.g., 7342866812345')}
                            {...field}
                          />
                        </FormControl>
                        <FormDescription>
                          {t('Enter the Coze agent ID')}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}

                {/* General base_url for other types */}
                {![3, 8, 22, 36, 45].includes(currentType) && (
                  <FormField
                    control={form.control}
                    name='base_url'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('Base URL')}</FormLabel>
                        <FormControl>
                          <Input
                            placeholder={t(FIELD_PLACEHOLDERS.BASE_URL)}
                            {...field}
                          />
                        </FormControl>
                        <FormDescription>
                          {t(
                            'Custom API base URL. For official channels, New API has built-in addresses. Only fill this for third-party proxy sites or special endpoints. Do not add /v1 or trailing slash.'
                          )}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}

                <div className='border-border/60 border-t pt-4'>
                  <SubHeading
                    title={t('Authentication')}
                    icon={<KeyRound className='h-3.5 w-3.5' />}
                  />
                </div>
                {!isEditing && (
                  <FormField
                    control={form.control}
                    name='multi_key_mode'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('Add Mode')}</FormLabel>
                        <Select
                          onValueChange={field.onChange}
                          value={field.value}
                        >
                          <FormControl>
                            <SelectTrigger>
                              <SelectValue />
                            </SelectTrigger>
                          </FormControl>
                          <SelectContent>
                            {ADD_MODE_OPTIONS.map((option) => (
                              <SelectItem
                                key={option.value}
                                value={option.value}
                              >
                                {t(option.label)}
                              </SelectItem>
                            ))}
                          </SelectContent>
                        </Select>
                        <FormDescription>
                          {t(FIELD_DESCRIPTIONS.BATCH_ADD)}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}

                <FormField
                  control={form.control}
                  name='key'
                  render={({ field }) => {
                    const keyPlaceholder = (() => {
                      if (isEditing) {
                        return t('Leave empty to keep existing key')
                      }
                      if (currentType === 33) {
                        if (awsKeyType === 'api_key') {
                          return isBatchMode
                            ? t(
                                'Enter API Key, one per line, format: APIKey|Region'
                              )
                            : t('Enter API Key, format: APIKey|Region')
                        }
                        return isBatchMode
                          ? t(
                              'Enter key, one per line, format: AccessKey|SecretAccessKey|Region'
                            )
                          : t(
                              'Enter key, format: AccessKey|SecretAccessKey|Region'
                            )
                      }
                      if (isBatchMode) {
                        return t('Enter one key per line for batch creation')
                      }
                      return t(getKeyPromptForType(currentType))
                    })()
                    return (
                      <FormItem>
                        <FormLabel>{t('API Key *')}</FormLabel>
                        <FormControl>
                          <Textarea
                            placeholder={keyPlaceholder}
                            rows={isBatchMode ? 8 : 4}
                            {...field}
                          />
                        </FormControl>
                        <FormDescription>
                          <div className='flex flex-col gap-2'>
                            <span>
                              {isEditing ? (
                                <>
                                  {t(
                                    'Enter new key to update, or leave empty to keep current key'
                                  )}
                                  {isMultiKeyChannel && (
                                    <span className='text-warning mt-1 block'>
                                      {t('Multi-key channel: Keys will be')}{' '}
                                      {keyMode === 'replace'
                                        ? t('replaced')
                                        : t('appended')}
                                    </span>
                                  )}
                                </>
                              ) : isBatchMode ? (
                                t(
                                  'Enter one API key per line for batch creation'
                                )
                              ) : (
                                t(FIELD_DESCRIPTIONS.KEY)
                              )}
                            </span>
                            {isBatchMode && (
                              <Button
                                type='button'
                                variant='outline'
                                size='sm'
                                onClick={handleDeduplicateKeys}
                                className='w-fit'
                              >
                                <Trash2 className='mr-2 h-4 w-4' />
                                {t('Remove Duplicates')}
                              </Button>
                            )}
                          </div>
                        </FormDescription>
                        {isEditing && (
                          <div className='mt-4 space-y-3 rounded-lg border border-dashed p-4'>
                            <div className='flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between'>
                              <div>
                                <p className='text-sm font-medium'>
                                  {t('Current key')}
                                </p>
                                <p className='text-muted-foreground text-xs'>
                                  {t(
                                    'Verification required to reveal the saved key.'
                                  )}
                                </p>
                              </div>
                              <div className='flex items-center gap-2'>
                                <Button
                                  type='button'
                                  variant='outline'
                                  size='sm'
                                  onClick={handleRevealKey}
                                  disabled={
                                    isChannelKeyLoading ||
                                    verificationState.loading
                                  }
                                >
                                  {isChannelKeyLoading ||
                                  verificationState.loading ? (
                                    <Loader2 className='mr-2 h-4 w-4 animate-spin' />
                                  ) : (
                                    <Eye className='mr-2 h-4 w-4' />
                                  )}
                                  {t('Reveal key')}
                                </Button>
                                <Button
                                  type='button'
                                  variant='ghost'
                                  size='sm'
                                  onClick={async () => {
                                    if (channelKey) {
                                      await copyToClipboard(channelKey)
                                    }
                                  }}
                                  disabled={!channelKey}
                                >
                                  <Copy className='mr-2 h-4 w-4' />
                                  {t('Copy')}
                                </Button>
                              </div>
                            </div>
                            <Input
                              readOnly
                              value={channelKey ?? ''}
                              placeholder={t('Hidden — verify to reveal')}
                              className='font-mono'
                            />
                          </div>
                        )}
                        <FormMessage />
                      </FormItem>
                    )
                  }}
                />

                {currentType === 57 && (
                  <div className='bg-muted/20 space-y-3 rounded-lg border p-4'>
                    <div className='flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between'>
                      <div className='space-y-0.5'>
                        <div className='text-sm font-semibold'>
                          {t('Codex Authorization')}
                        </div>
                        <div className='text-muted-foreground text-xs'>
                          {t(
                            'Codex channels use an OAuth JSON credential as the key.'
                          )}
                        </div>
                      </div>
                      <div className='flex flex-wrap items-center gap-2'>
                        <Button
                          type='button'
                          variant='outline'
                          size='sm'
                          onClick={() => setCodexOAuthDialogOpen(true)}
                        >
                          <Link2 className='mr-2 h-4 w-4' />
                          {t('Authorize')}
                        </Button>
                        {isEditing && channelId && (
                          <Button
                            type='button'
                            variant='outline'
                            size='sm'
                            onClick={handleRefreshCodexCredential}
                            disabled={isCodexCredentialRefreshing}
                          >
                            {isCodexCredentialRefreshing ? (
                              <Loader2 className='mr-2 h-4 w-4 animate-spin' />
                            ) : (
                              <RefreshCw className='mr-2 h-4 w-4' />
                            )}
                            {isCodexCredentialRefreshing
                              ? t('Refreshing...')
                              : t('Refresh credential')}
                          </Button>
                        )}
                      </div>
                    </div>
                    <Alert>
                      <AlertDescription>
                        {t(
                          'If authorization succeeds, the generated JSON will be inserted into the key field. You still need to save the channel to persist it.'
                        )}
                      </AlertDescription>
                    </Alert>
                  </div>
                )}

                <CodexOAuthDialog
                  open={codexOAuthDialogOpen}
                  onOpenChange={setCodexOAuthDialogOpen}
                  onKeyGenerated={(key) => {
                    form.setValue('key', key, { shouldDirty: true })
                  }}
                />

                {isEditing && isMultiKeyChannel && (
                  <FormField
                    control={form.control}
                    name='key_mode'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('Key Update Mode')}</FormLabel>
                        <Select
                          onValueChange={field.onChange}
                          value={field.value}
                        >
                          <FormControl>
                            <SelectTrigger>
                              <SelectValue />
                            </SelectTrigger>
                          </FormControl>
                          <SelectContent>
                            <SelectItem value='append'>
                              {t('Append to existing keys')}
                            </SelectItem>
                            <SelectItem value='replace'>
                              {t('Replace all existing keys')}
                            </SelectItem>
                          </SelectContent>
                        </Select>
                        <FormDescription>
                          {field.value === 'replace'
                            ? t(
                                'Replace mode: Will completely replace all existing keys'
                              )
                            : t(
                                'Append mode: New keys will be added to the end of the existing key list'
                              )}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}

                {!isEditing && multiKeyMode === 'multi_to_single' && (
                  <FormField
                    control={form.control}
                    name='multi_key_type'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('Multi-Key Strategy')}</FormLabel>
                        <Select
                          onValueChange={field.onChange}
                          value={field.value}
                        >
                          <FormControl>
                            <SelectTrigger>
                              <SelectValue />
                            </SelectTrigger>
                          </FormControl>
                          <SelectContent>
                            <SelectItem value='random'>
                              {t('Random')}
                            </SelectItem>
                            <SelectItem value='polling'>
                              {t('Polling')}
                            </SelectItem>
                          </SelectContent>
                        </Select>
                        <FormDescription>
                          {multiKeyType === 'polling' ? (
                            <span className='text-warning'>
                              {t(
                                'Polling mode requires Redis and memory cache, otherwise performance will be significantly degraded'
                              )}
                            </span>
                          ) : (
                            t(
                              'Randomly select a key from the pool for each request'
                            )
                          )}
                        </FormDescription>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}
              </div>

              {/* ── Models & Groups ── */}
              <div className='bg-card space-y-4 rounded-xl border p-5'>
                <CardHeading
                  title={t('Models & Groups')}
                  icon={<Boxes className='h-4 w-4' />}
                />
                <FormField
                  control={form.control}
                  name='models'
                  render={() => (
                    <FormItem>
                      <FormLabel>{t('Models *')}</FormLabel>
                      <FormControl>
                        <MultiSelect
                          options={modelOptions}
                          selected={currentModelsArray}
                          onChange={handleModelsChange}
                          placeholder={t('Select models or add custom ones')}
                        />
                      </FormControl>
                      <FormDescription>
                        <div className='flex flex-col gap-2'>
                          <span>{t(FIELD_DESCRIPTIONS.MODELS)}</span>
                          <div className='flex flex-wrap gap-2'>
                            <Button
                              type='button'
                              variant='outline'
                              size='sm'
                              onClick={handleFillRelatedModels}
                              disabled={!basicModels.length}
                            >
                              <FileText className='mr-2 h-4 w-4' />
                              {t('Fill Related Models')}
                            </Button>
                            <Button
                              type='button'
                              variant='outline'
                              size='sm'
                              onClick={handleFillAllModels}
                              disabled={!allModelsList.length}
                            >
                              <Plus className='mr-2 h-4 w-4' />
                              {t('Fill All Models')}
                            </Button>
                            {MODEL_FETCHABLE_TYPES.has(currentType) && (
                              <Button
                                type='button'
                                variant='outline'
                                size='sm'
                                onClick={handleFetchModels}
                                disabled={isFetchingModels}
                              >
                                {isFetchingModels ? (
                                  <Loader2 className='mr-2 h-4 w-4 animate-spin' />
                                ) : (
                                  <Sparkles className='mr-2 h-4 w-4' />
                                )}
                                {t('Fetch from Upstream')}
                              </Button>
                            )}
                            <Button
                              type='button'
                              variant='outline'
                              size='sm'
                              onClick={handleClearModels}
                            >
                              <Eraser className='mr-2 h-4 w-4' />
                              {t('Clear All')}
                            </Button>
                            <Button
                              type='button'
                              variant='outline'
                              size='sm'
                              onClick={handleCopyModels}
                            >
                              <Copy className='mr-2 h-4 w-4' />
                              {t('Copy All')}
                            </Button>
                            {prefillGroups.map((group) => (
                              <Button
                                key={group.id}
                                type='button'
                                variant='secondary'
                                size='sm'
                                onClick={() => handleAddPrefillGroup(group)}
                              >
                                {group.name}
                              </Button>
                            ))}
                          </div>
                        </div>
                      </FormDescription>
                      {modelMappingGuardrail.exposedTargetModels.length > 0 && (
                        <Alert className='mt-3 border-amber-200 bg-amber-50 text-amber-900 dark:border-amber-500/40 dark:bg-amber-500/10 dark:text-amber-50'>
                          <AlertDescription>
                            {t('The mapped upstream model(s)')}{' '}
                            {formatModelNames(
                              modelMappingGuardrail.exposedTargetModels
                            )}{' '}
                            {t(
                              'are also listed here. Remove them from Models to keep the `/v1/models` response user-friendly and hide vendor-specific names.'
                            )}
                          </AlertDescription>
                        </Alert>
                      )}
                      <FormMessage />
                    </FormItem>
                  )}
                />

                {/* Custom Model Input */}
                <div className='flex gap-2'>
                  <Input
                    placeholder={t('Add custom model(s), comma-separated')}
                    value={customModel}
                    onChange={(e) => setCustomModel(e.target.value)}
                    onKeyDown={(e) => {
                      if (e.key === 'Enter') {
                        e.preventDefault()
                        handleAddCustomModels()
                      }
                    }}
                  />
                  <Button
                    type='button'
                    variant='secondary'
                    onClick={handleAddCustomModels}
                    disabled={!customModel}
                  >
                    {t('Add')}
                  </Button>
                </div>

                <FormField
                  control={form.control}
                  name='model_mapping'
                  render={({ field }) => (
                    <FormItem>
                      <div className='flex items-center gap-2'>
                        <FormLabel className='mb-0'>
                          {t('Model Mapping')}
                        </FormLabel>
                        <Tooltip>
                          <TooltipTrigger
                            render={
                              <Button
                                type='button'
                                variant='ghost'
                                size='icon-sm'
                                className='text-muted-foreground hover:text-foreground size-auto p-0'
                                aria-label='How model mapping works'
                              />
                            }
                          >
                            <HelpCircle className='h-4 w-4' />
                          </TooltipTrigger>
                          <TooltipContent
                            side='top'
                            align='start'
                            className='max-w-xs space-y-2 text-left'
                          >
                            <p className='text-xs font-semibold tracking-wide uppercase'>
                              {t('Request flow')}
                            </p>
                            <div className='space-y-1 font-mono text-xs'>
                              {mappingPreviewPairs.map((pair) => (
                                <div
                                  key={`${pair.source}-${pair.target}`}
                                  className='flex items-center gap-1'
                                >
                                  <span>{pair.source}</span>
                                  <ArrowRight className='h-3.5 w-3.5 opacity-70' />
                                  <span>{pair.target}</span>
                                </div>
                              ))}
                              {remainingMappingCount > 0 && (
                                <div className='text-[11px] opacity-70'>
                                  +{remainingMappingCount} {t('more mapping')}
                                  {remainingMappingCount > 1 ? 's' : ''}
                                </div>
                              )}
                            </div>
                            <p className='text-[11px] leading-relaxed opacity-80'>
                              {t(
                                'Users call the model on the left. The platform forwards the request to the upstream model on the right.'
                              )}
                            </p>
                          </TooltipContent>
                        </Tooltip>
                      </div>
                      <FormControl>
                        <ModelMappingEditor
                          value={field.value || ''}
                          onChange={field.onChange}
                          disabled={isSubmitting}
                        />
                      </FormControl>
                      <FormDescription>
                        {t(FIELD_DESCRIPTIONS.MODEL_MAPPING)}
                      </FormDescription>
                      {modelMappingGuardrail.invalidJson && (
                        <Alert variant='destructive' className='mt-3'>
                          <AlertDescription>
                            {t('Model Mapping must be a JSON object like')}{' '}
                            <code className='font-mono'>
                              {'{"gpt-4":"Azure-GPT4"}'}
                            </code>
                            {t('. Please fix the JSON before saving.')}
                          </AlertDescription>
                        </Alert>
                      )}
                      {modelMappingGuardrail.missingSourceModels.length > 0 && (
                        <Alert className='mt-3 border-amber-200 bg-amber-50 text-amber-900 dark:border-amber-500/40 dark:bg-amber-500/10 dark:text-amber-50'>
                          <AlertDescription>
                            {t('Add')}{' '}
                            {formatModelNames(
                              modelMappingGuardrail.missingSourceModels
                            )}{' '}
                            {t(
                              'to the Models list so users can use them before the mapping sends traffic upstream.'
                            )}
                          </AlertDescription>
                        </Alert>
                      )}
                      <FormMessage />
                    </FormItem>
                  )}
                />

                <FormField
                  control={form.control}
                  name='group'
                  render={({ field }) => (
                    <FormItem>
                      <FormLabel>{t('Groups *')}</FormLabel>
                      <FormControl>
                        {isLoadingGroups ? (
                          <Skeleton className='h-10 w-full' />
                        ) : (
                          <MultiSelect
                            options={groupOptions}
                            selected={field.value}
                            onChange={field.onChange}
                            placeholder={t(FIELD_PLACEHOLDERS.GROUP)}
                          />
                        )}
                      </FormControl>
                      <FormDescription>
                        {t(FIELD_DESCRIPTIONS.GROUP)}
                      </FormDescription>
                      <FormMessage />
                    </FormItem>
                  )}
                />
              </div>

              <Collapsible
                open={advancedSettingsOpen}
                onOpenChange={handleAdvancedSettingsOpenChange}
              >
                <CollapsibleTrigger
                  render={
                    <button
                      type='button'
                      className='bg-card hover:bg-accent/50 flex w-full items-center justify-between rounded-xl border px-5 py-4 text-left transition-colors'
                    />
                  }
                >
                  <div className='space-y-0.5'>
                    <div className='text-[13px] font-semibold'>
                      {t('Advanced Settings')}
                    </div>
                    <div className='text-muted-foreground text-xs'>
                      {t(
                        'Request overrides, routing behavior, and upstream model automation'
                      )}
                    </div>
                  </div>
                  <ChevronDown
                    className={cn(
                      'text-muted-foreground h-4 w-4 shrink-0 transition-transform',
                      advancedSettingsOpen && 'rotate-180'
                    )}
                  />
                </CollapsibleTrigger>

                <CollapsibleContent className='mt-5 space-y-5'>
                  {/* ── Routing & Overrides ── */}
                  <div className='bg-card space-y-4 rounded-xl border p-5'>
                    <CardHeading
                      title={t('Routing & Overrides')}
                      icon={<Route className='h-4 w-4' />}
                    />
                    <div className='space-y-4'>
                      <SubHeading
                        title={t('Routing Strategy')}
                        icon={<Route className='h-3.5 w-3.5' />}
                      />
                      <div className='grid gap-4 sm:grid-cols-2'>
                        <FormField
                          control={form.control}
                          name='priority'
                          render={({ field }) => (
                            <FormItem>
                              <FormLabel>{t('Priority')}</FormLabel>
                              <FormControl>
                                <Input
                                  type='number'
                                  placeholder='0'
                                  {...field}
                                  onChange={(e) =>
                                    field.onChange(Number(e.target.value))
                                  }
                                />
                              </FormControl>
                              <FormDescription>
                                {t(FIELD_DESCRIPTIONS.PRIORITY)}
                              </FormDescription>
                              <FormMessage />
                            </FormItem>
                          )}
                        />

                        <FormField
                          control={form.control}
                          name='weight'
                          render={({ field }) => (
                            <FormItem>
                              <FormLabel>{t('Weight')}</FormLabel>
                              <FormControl>
                                <Input
                                  type='number'
                                  placeholder='0'
                                  {...field}
                                  onChange={(e) =>
                                    field.onChange(Number(e.target.value))
                                  }
                                />
                              </FormControl>
                              <FormDescription>
                                {t(FIELD_DESCRIPTIONS.WEIGHT)}
                              </FormDescription>
                              <FormMessage />
                            </FormItem>
                          )}
                        />
                      </div>

                      <FormField
                        control={form.control}
                        name='test_model'
                        render={({ field }) => (
                          <FormItem>
                            <FormLabel>{t('Test Model')}</FormLabel>
                            <FormControl>
                              <Input
                                placeholder={t(FIELD_PLACEHOLDERS.TEST_MODEL)}
                                {...field}
                              />
                            </FormControl>
                            <FormDescription>
                              {t(FIELD_DESCRIPTIONS.TEST_MODEL)}
                            </FormDescription>
                            <FormMessage />
                          </FormItem>
                        )}
                      />

                      <FormField
                        control={form.control}
                        name='auto_ban'
                        render={({ field }) => (
                          <FormItem className='flex items-center justify-between'>
                            <div className='space-y-0.5'>
                              <FormLabel>{t('Auto Ban')}</FormLabel>
                              <FormDescription>
                                {t(FIELD_DESCRIPTIONS.AUTO_BAN)}
                              </FormDescription>
                            </div>
                            <FormControl>
                              <Switch
                                checked={field.value === 1}
                                onCheckedChange={(checked) =>
                                  field.onChange(checked ? 1 : 0)
                                }
                              />
                            </FormControl>
                          </FormItem>
                        )}
                      />
                    </div>

                    <div className='space-y-4 border-t pt-4'>
                      <SubHeading
                        title={t('Internal Notes')}
                        icon={<FileText className='h-3.5 w-3.5' />}
                      />
                      <div className='grid gap-4 sm:grid-cols-2'>
                        <FormField
                          control={form.control}
                          name='tag'
                          render={({ field }) => (
                            <FormItem>
                              <FormLabel>{t('Tag')}</FormLabel>
                              <FormControl>
                                <Input
                                  placeholder={t(FIELD_PLACEHOLDERS.TAG)}
                                  {...field}
                                />
                              </FormControl>
                              <FormDescription>
                                {t(FIELD_DESCRIPTIONS.TAG)}
                              </FormDescription>
                              <FormMessage />
                            </FormItem>
                          )}
                        />

                        <FormField
                          control={form.control}
                          name='remark'
                          render={({ field }) => (
                            <FormItem>
                              <FormLabel>{t('Remark')}</FormLabel>
                              <FormControl>
                                <Textarea
                                  placeholder={t(FIELD_PLACEHOLDERS.REMARK)}
                                  rows={2}
                                  {...field}
                                />
                              </FormControl>
                              <FormDescription>
                                {t(FIELD_DESCRIPTIONS.REMARK)}
                              </FormDescription>
                              <FormMessage />
                            </FormItem>
                          )}
                        />
                      </div>
                    </div>

                    <div className='space-y-4 border-t pt-4'>
                      <SubHeading
                        title={t('Override Rules')}
                        icon={<Code className='h-3.5 w-3.5' />}
                      />

                      <FormField
                        control={form.control}
                        name='status_code_mapping'
                        render={({ field }) => (
                          <FormItem className='space-y-3'>
                            <div className='space-y-1'>
                              <FormLabel>{t('Status Code Mapping')}</FormLabel>
                              <FormDescription>
                                {t(
                                  'Map upstream status codes to different codes'
                                )}
                              </FormDescription>
                            </div>
                            <FormControl>
                              <JsonEditor
                                value={field.value || ''}
                                onChange={field.onChange}
                                disabled={isSubmitting}
                                keyPlaceholder='400'
                                valuePlaceholder='500'
                                keyLabel='Original Code'
                                valueLabel='Mapped Code'
                                emptyMessage={t(
                                  'No status code mappings configured.'
                                )}
                                template={{ '400': '500', '429': '503' }}
                                valueType='string'
                              />
                            </FormControl>
                            <FormMessage />
                          </FormItem>
                        )}
                      />

                      <FormField
                        control={form.control}
                        name='param_override'
                        render={({ field }) => (
                          <FormItem className='space-y-3 border-t pt-4'>
                            <div className='flex flex-col gap-2 sm:flex-row sm:items-start sm:justify-between'>
                              <div className='space-y-1'>
                                <FormLabel>{t('Parameter Override')}</FormLabel>
                                <FormDescription>
                                  {t(
                                    'Override request parameters. Cannot override stream parameter.'
                                  )}
                                </FormDescription>
                              </div>
                              <div className='flex flex-wrap gap-2'>
                                <Button
                                  type='button'
                                  variant='outline'
                                  size='sm'
                                  onClick={() =>
                                    setParamOverrideEditorOpen(true)
                                  }
                                >
                                  <Wand2 className='mr-2 h-4 w-4' />
                                  {t('Visual edit')}
                                </Button>
                                <Button
                                  type='button'
                                  variant='outline'
                                  size='sm'
                                  onClick={() => {
                                    field.onChange(
                                      JSON.stringify(
                                        {
                                          operations: [
                                            {
                                              path: 'temperature',
                                              mode: 'set',
                                              value: 0.7,
                                              conditions: [
                                                {
                                                  path: 'model',
                                                  mode: 'prefix',
                                                  value: 'gpt',
                                                },
                                              ],
                                              logic: 'AND',
                                            },
                                          ],
                                        },
                                        null,
                                        2
                                      )
                                    )
                                  }}
                                >
                                  <Code className='mr-2 h-4 w-4' />
                                  {t('New Format Template')}
                                </Button>
                                <Button
                                  type='button'
                                  variant='ghost'
                                  size='sm'
                                  onClick={() => field.onChange('')}
                                >
                                  {t('Clear')}
                                </Button>
                              </div>
                            </div>
                            <FormControl>
                              <JsonEditor
                                value={field.value || ''}
                                onChange={field.onChange}
                                disabled={isSubmitting}
                                keyPlaceholder='temperature'
                                valuePlaceholder='0.7'
                                keyLabel='Parameter'
                                valueLabel='Value'
                                emptyMessage={t(
                                  'No parameter overrides configured.'
                                )}
                                template={{
                                  temperature: 0.7,
                                  max_tokens: 2000,
                                  top_p: 1,
                                }}
                                valueType='any'
                              />
                            </FormControl>
                            <FormMessage />
                          </FormItem>
                        )}
                      />

                      <FormField
                        control={form.control}
                        name='header_override'
                        render={({ field }) => (
                          <FormItem className='space-y-3 border-t pt-4'>
                            <div className='flex flex-col gap-2 sm:flex-row sm:items-start sm:justify-between'>
                              <div className='space-y-1'>
                                <FormLabel>
                                  {t('Request Header Override')}
                                </FormLabel>
                                <FormDescription>
                                  {t('Override request headers')}
                                </FormDescription>
                              </div>
                              <div className='flex flex-wrap gap-2'>
                                <Button
                                  type='button'
                                  variant='outline'
                                  size='sm'
                                  onClick={() =>
                                    field.onChange(
                                      JSON.stringify(
                                        {
                                          '*': true,
                                          're:^X-Trace-.*$': true,
                                          'X-Foo': '{client_header:X-Foo}',
                                          Authorization: 'Bearer {api_key}',
                                        },
                                        null,
                                        2
                                      )
                                    )
                                  }
                                >
                                  {t('Fill Template')}
                                </Button>
                                <Button
                                  type='button'
                                  variant='outline'
                                  size='sm'
                                  onClick={() =>
                                    field.onChange(
                                      JSON.stringify({ '*': true }, null, 2)
                                    )
                                  }
                                >
                                  {t('Passthrough Template')}
                                </Button>
                                <Button
                                  type='button'
                                  variant='outline'
                                  size='sm'
                                  onClick={() => {
                                    try {
                                      const parsed = JSON.parse(
                                        field.value || '{}'
                                      )
                                      field.onChange(
                                        JSON.stringify(parsed, null, 2)
                                      )
                                    } catch (_e) {
                                      /* ignore invalid JSON */
                                    }
                                  }}
                                >
                                  {t('Format')}
                                </Button>
                                <Button
                                  type='button'
                                  variant='ghost'
                                  size='sm'
                                  onClick={() => field.onChange('')}
                                >
                                  {t('Clear')}
                                </Button>
                              </div>
                            </div>
                            <FormControl>
                              <Textarea
                                className='font-mono text-sm'
                                rows={6}
                                value={field.value || ''}
                                onChange={field.onChange}
                                disabled={isSubmitting}
                                placeholder={t(
                                  'Enter JSON to override request headers'
                                )}
                              />
                            </FormControl>
                            <FormDescription className='text-xs'>
                              {t('Supported variables')}:{' '}
                              <code className='bg-muted rounded px-1 py-0.5'>
                                {'{api_key}'}
                              </code>{' '}
                              — {t('Channel key')},{' '}
                              <code className='bg-muted rounded px-1 py-0.5'>
                                {'{client_header:NAME}'}
                              </code>{' '}
                              — {t('Client header value')}
                            </FormDescription>
                            <FormMessage />
                          </FormItem>
                        )}
                      />
                    </div>
                  </div>

                  {/* ── Extra Settings ── */}
                  <div className='bg-card space-y-4 rounded-xl border p-5'>
                    <CardHeading
                      title={t('Channel Extra Settings')}
                      icon={<Settings className='h-4 w-4' />}
                    />
                    {(currentType === 1 || currentType === 14) && (
                      <div className='space-y-3 rounded-lg border p-4'>
                        <SubHeading
                          title={t('Field passthrough controls')}
                          icon={<SlidersHorizontal className='h-3.5 w-3.5' />}
                        />

                        <div className='divide-border space-y-0 divide-y border-y'>
                          <FormField
                            control={form.control}
                            name='allow_service_tier'
                            render={({ field }) => (
                              <FormItem className='flex items-center justify-between gap-3 px-4 py-3'>
                                <div className='space-y-0.5'>
                                  <FormLabel className='text-sm'>
                                    {t('Allow service_tier passthrough')}
                                  </FormLabel>
                                  <FormDescription>
                                    {t('Pass through the service_tier field')}
                                  </FormDescription>
                                </div>
                                <FormControl>
                                  <Switch
                                    checked={field.value}
                                    onCheckedChange={field.onChange}
                                  />
                                </FormControl>
                              </FormItem>
                            )}
                          />

                          {currentType === 1 && (
                            <>
                              <FormField
                                control={form.control}
                                name='disable_store'
                                render={({ field }) => (
                                  <FormItem className='flex items-center justify-between gap-3 px-4 py-3'>
                                    <div className='space-y-0.5'>
                                      <FormLabel className='text-sm'>
                                        {t('Disable store passthrough')}
                                      </FormLabel>
                                      <FormDescription>
                                        {t(
                                          'When enabled, the store field will be blocked'
                                        )}
                                      </FormDescription>
                                    </div>
                                    <FormControl>
                                      <Switch
                                        checked={field.value}
                                        onCheckedChange={field.onChange}
                                      />
                                    </FormControl>
                                  </FormItem>
                                )}
                              />

                              <FormField
                                control={form.control}
                                name='allow_safety_identifier'
                                render={({ field }) => (
                                  <FormItem className='flex items-center justify-between gap-3 px-4 py-3'>
                                    <div className='space-y-0.5'>
                                      <FormLabel className='text-sm'>
                                        {t(
                                          'Allow safety_identifier passthrough'
                                        )}
                                      </FormLabel>
                                      <FormDescription>
                                        {t(
                                          'Pass through the safety_identifier field'
                                        )}
                                      </FormDescription>
                                    </div>
                                    <FormControl>
                                      <Switch
                                        checked={field.value}
                                        onCheckedChange={field.onChange}
                                      />
                                    </FormControl>
                                  </FormItem>
                                )}
                              />

                              <FormField
                                control={form.control}
                                name='allow_include_obfuscation'
                                render={({ field }) => (
                                  <FormItem className='flex items-center justify-between gap-3 px-4 py-3'>
                                    <div className='space-y-0.5'>
                                      <FormLabel className='text-sm'>
                                        {t(
                                          'Allow include usage obfuscation passthrough'
                                        )}
                                      </FormLabel>
                                      <FormDescription>
                                        {t(
                                          'Pass through the include field for usage obfuscation'
                                        )}
                                      </FormDescription>
                                    </div>
                                    <FormControl>
                                      <Switch
                                        checked={field.value}
                                        onCheckedChange={field.onChange}
                                      />
                                    </FormControl>
                                  </FormItem>
                                )}
                              />

                              <FormField
                                control={form.control}
                                name='allow_inference_geo'
                                render={({ field }) => (
                                  <FormItem className='flex items-center justify-between gap-3 px-4 py-3'>
                                    <div className='space-y-0.5'>
                                      <FormLabel className='text-sm'>
                                        {t(
                                          'Allow inference geography passthrough'
                                        )}
                                      </FormLabel>
                                      <FormDescription>
                                        {t(
                                          'Pass through the inference_geo field for geographic routing'
                                        )}
                                      </FormDescription>
                                    </div>
                                    <FormControl>
                                      <Switch
                                        checked={field.value}
                                        onCheckedChange={field.onChange}
                                      />
                                    </FormControl>
                                  </FormItem>
                                )}
                              />
                            </>
                          )}

                          {currentType === 14 && (
                            <>
                              <FormField
                                control={form.control}
                                name='allow_inference_geo'
                                render={({ field }) => (
                                  <FormItem className='flex items-center justify-between gap-3 px-4 py-3'>
                                    <div className='space-y-0.5'>
                                      <FormLabel className='text-sm'>
                                        {t('Allow inference_geo passthrough')}
                                      </FormLabel>
                                      <FormDescription>
                                        {t(
                                          'Pass through the inference_geo field for Claude data residency region control'
                                        )}
                                      </FormDescription>
                                    </div>
                                    <FormControl>
                                      <Switch
                                        checked={field.value}
                                        onCheckedChange={field.onChange}
                                      />
                                    </FormControl>
                                  </FormItem>
                                )}
                              />

                              <FormField
                                control={form.control}
                                name='allow_speed'
                                render={({ field }) => (
                                  <FormItem className='flex items-center justify-between gap-3 px-4 py-3'>
                                    <div className='space-y-0.5'>
                                      <FormLabel className='text-sm'>
                                        {t('Allow speed passthrough')}
                                      </FormLabel>
                                      <FormDescription>
                                        {t(
                                          'Pass through the speed field for Claude inference speed mode control'
                                        )}
                                      </FormDescription>
                                    </div>
                                    <FormControl>
                                      <Switch
                                        checked={field.value}
                                        onCheckedChange={field.onChange}
                                      />
                                    </FormControl>
                                  </FormItem>
                                )}
                              />

                              <FormField
                                control={form.control}
                                name='claude_beta_query'
                                render={({ field }) => (
                                  <FormItem className='flex items-center justify-between gap-3 px-4 py-3'>
                                    <div className='space-y-0.5'>
                                      <FormLabel className='text-sm'>
                                        {t(
                                          'Allow Claude beta query passthrough'
                                        )}
                                      </FormLabel>
                                      <FormDescription>
                                        {t(
                                          'Pass through the anthropic-beta header for beta features'
                                        )}
                                      </FormDescription>
                                    </div>
                                    <FormControl>
                                      <Switch
                                        checked={field.value}
                                        onCheckedChange={field.onChange}
                                      />
                                    </FormControl>
                                  </FormItem>
                                )}
                              />
                            </>
                          )}
                        </div>
                      </div>
                    )}

                    <div className='divide-border space-y-0 divide-y border-y'>
                      {currentType === 1 && (
                        <FormField
                          control={form.control}
                          name='force_format'
                          render={({ field }) => (
                            <FormItem className='flex items-center justify-between px-4 py-3'>
                              <div className='space-y-0.5'>
                                <FormLabel>{t('Force Format')}</FormLabel>
                                <FormDescription>
                                  {t(
                                    'Force format response to OpenAI standard (OpenAI channel only)'
                                  )}
                                </FormDescription>
                              </div>
                              <FormControl>
                                <Switch
                                  checked={field.value}
                                  onCheckedChange={field.onChange}
                                />
                              </FormControl>
                            </FormItem>
                          )}
                        />
                      )}

                      <FormField
                        control={form.control}
                        name='thinking_to_content'
                        render={({ field }) => (
                          <FormItem className='flex items-center justify-between px-4 py-3'>
                            <div className='space-y-0.5'>
                              <FormLabel>{t('Thinking to Content')}</FormLabel>
                              <FormDescription>
                                {t(
                                  'Convert reasoning_content to <think> tag in content'
                                )}
                              </FormDescription>
                            </div>
                            <FormControl>
                              <Switch
                                checked={field.value}
                                onCheckedChange={field.onChange}
                              />
                            </FormControl>
                          </FormItem>
                        )}
                      />

                      <FormField
                        control={form.control}
                        name='pass_through_body_enabled'
                        render={({ field }) => (
                          <FormItem className='flex items-center justify-between px-4 py-3'>
                            <div className='space-y-0.5'>
                              <FormLabel>{t('Pass Through Body')}</FormLabel>
                              <FormDescription>
                                {t('Pass request body directly to upstream')}
                              </FormDescription>
                            </div>
                            <FormControl>
                              <Switch
                                checked={field.value}
                                onCheckedChange={field.onChange}
                              />
                            </FormControl>
                          </FormItem>
                        )}
                      />
                    </div>

                    <FormField
                      control={form.control}
                      name='proxy'
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>{t('Proxy Address')}</FormLabel>
                          <FormControl>
                            <Input
                              placeholder={t('socks5://user:pass@host:port')}
                              {...field}
                            />
                          </FormControl>
                          <FormDescription>
                            {t(
                              'Network proxy for this channel (supports socks5 protocol)'
                            )}
                          </FormDescription>
                          <FormMessage />
                        </FormItem>
                      )}
                    />

                    <FormField
                      control={form.control}
                      name='system_prompt'
                      render={({ field }) => (
                        <FormItem>
                          <FormLabel>{t('System Prompt')}</FormLabel>
                          <FormControl>
                            <Textarea
                              placeholder={t(
                                'Enter system prompt (user prompt takes priority)'
                              )}
                              rows={3}
                              {...field}
                            />
                          </FormControl>
                          <FormDescription>
                            {t('Default system prompt for this channel')}
                          </FormDescription>
                          <FormMessage />
                        </FormItem>
                      )}
                    />

                    <FormField
                      control={form.control}
                      name='system_prompt_override'
                      render={({ field }) => (
                        <FormItem className='flex items-center justify-between'>
                          <div className='space-y-0.5'>
                            <FormLabel>
                              {t('System Prompt Concatenation')}
                            </FormLabel>
                            <FormDescription>
                              {t(
                                'Concatenate channel system prompt with user&apos;s prompt'
                              )}
                            </FormDescription>
                          </div>
                          <FormControl>
                            <Switch
                              checked={field.value}
                              onCheckedChange={field.onChange}
                            />
                          </FormControl>
                        </FormItem>
                      )}
                    />

                    {MODEL_FETCHABLE_TYPES.has(currentType) && (
                      <div className='space-y-3 rounded-lg border p-4'>
                        <SubHeading
                          title={t('Upstream Model Detection Settings')}
                          icon={<RefreshCw className='h-3.5 w-3.5' />}
                        />
                        <div className='divide-border space-y-0 divide-y border-y'>
                          <FormField
                            control={form.control}
                            name='upstream_model_update_check_enabled'
                            render={({ field }) => (
                              <FormItem className='flex items-center justify-between px-4 py-3'>
                                <div className='space-y-0.5'>
                                  <FormLabel>
                                    {t('Upstream Model Update Check')}
                                  </FormLabel>
                                  <FormDescription>
                                    {t(
                                      'Periodically check for upstream model changes'
                                    )}
                                  </FormDescription>
                                </div>
                                <FormControl>
                                  <Switch
                                    checked={field.value}
                                    onCheckedChange={field.onChange}
                                  />
                                </FormControl>
                              </FormItem>
                            )}
                          />
                          <FormField
                            control={form.control}
                            name='upstream_model_update_auto_sync_enabled'
                            render={({ field }) => (
                              <FormItem className='flex items-center justify-between px-4 py-3'>
                                <div className='space-y-0.5'>
                                  <FormLabel>
                                    {t('Auto Sync Upstream Models')}
                                  </FormLabel>
                                  <FormDescription>
                                    {t(
                                      'Automatically sync model list when upstream changes are detected'
                                    )}
                                  </FormDescription>
                                </div>
                                <FormControl>
                                  <Switch
                                    checked={field.value}
                                    disabled={!upstreamModelUpdateCheckEnabled}
                                    onCheckedChange={field.onChange}
                                  />
                                </FormControl>
                              </FormItem>
                            )}
                          />
                        </div>
                        <FormField
                          control={form.control}
                          name='upstream_model_update_ignored_models'
                          render={({ field }) => (
                            <FormItem>
                              <FormLabel>
                                {t('Ignored upstream models')}
                              </FormLabel>
                              <FormControl>
                                <Input
                                  placeholder={t(
                                    'e.g., gpt-4.1-nano,regex:^claude-.*$,regex:^sora-.*$'
                                  )}
                                  {...field}
                                />
                              </FormControl>
                              <FormDescription>
                                {t(
                                  'Comma-separated exact model names. Prefix with regex: to ignore by regular expression.'
                                )}
                              </FormDescription>
                              <FormMessage />
                            </FormItem>
                          )}
                        />
                        <div className='text-muted-foreground space-y-2 border-t pt-3 text-xs'>
                          <div>
                            <span className='text-foreground font-medium'>
                              {t('Last check time')}:
                            </span>{' '}
                            {formatUnixTime(upstreamUpdateMeta.lastCheckTime)}
                          </div>
                          <div>
                            <span className='text-foreground font-medium'>
                              {t('Last detected addable models')}:
                            </span>{' '}
                            {upstreamUpdateMeta.detectedModels.length === 0 ? (
                              t('None')
                            ) : (
                              <>
                                <span className='break-all'>
                                  {upstreamDetectedModelsPreview.join(', ')}
                                </span>
                                {upstreamDetectedModelsOmittedCount > 0 && (
                                  <span className='ml-1'>
                                    {t('({{total}} total, {{omit}} omitted)', {
                                      total:
                                        upstreamUpdateMeta.detectedModels
                                          .length,
                                      omit: upstreamDetectedModelsOmittedCount,
                                    })}
                                  </span>
                                )}
                              </>
                            )}
                          </div>
                        </div>
                      </div>
                    )}
                  </div>
                </CollapsibleContent>
              </Collapsible>
            </form>
          </Form>

          <SheetFooter className='grid grid-cols-2 gap-2 border-t px-4 py-3 sm:flex sm:px-6 sm:py-4'>
            <SheetClose
              render={<Button variant='outline' disabled={isSubmitting} />}
            >
              {t('Cancel')}
            </SheetClose>
            <Button form='channel-form' type='submit' disabled={isSubmitting}>
              {isSubmitting && (
                <Loader2 className='mr-2 h-4 w-4 animate-spin' />
              )}
              {isEditing ? t('Update Channel') : t('Save changes')}
            </Button>
          </SheetFooter>
        </SheetContent>
      </Sheet>

      {paramOverrideEditorOpen && (
        <ParamOverrideEditorDialog
          open={paramOverrideEditorOpen}
          value={form.watch('param_override') || ''}
          onOpenChange={setParamOverrideEditorOpen}
          onSave={(nextValue) => {
            form.setValue('param_override', nextValue, {
              shouldDirty: true,
              shouldValidate: true,
            })
          }}
        />
      )}

      {/* Fetch Models Dialog (for editing mode) */}
      {isEditing && currentRow && (
        <FetchModelsDialog
          open={fetchModelsDialogOpen}
          onOpenChange={setFetchModelsDialogOpen}
          onModelsSelected={(models) => {
            // Fill selected models to form
            form.setValue('models', formatModelsArray(models))
          }}
          redirectModels={redirectModelList}
          redirectSourceModels={redirectModelKeyList}
        />
      )}

      <SecureVerificationDialog
        open={verificationOpen}
        onOpenChange={(open) => {
          if (!open) {
            cancelVerification()
          }
        }}
        methods={verificationMethods}
        state={verificationState}
        onVerify={async (method, code) => {
          await executeVerification(method, code)
        }}
        onCancel={cancelVerification}
        onCodeChange={setVerificationCode}
        onMethodChange={switchVerificationMethod}
      />

      {/* Missing Models Confirmation Dialog */}
      <MissingModelsConfirmationDialog
        open={missingModelsDialogOpen}
        missingModels={missingModelsList}
        onConfirm={handleMissingModelsAction}
        onOpenChange={setMissingModelsDialogOpen}
      />

      <StatusCodeRiskDialog
        open={statusCodeRiskOpen}
        onOpenChange={(v) => {
          if (!v) handleStatusCodeRiskAction(false)
        }}
        detailItems={statusCodeRiskDetailItems}
        onConfirm={() => handleStatusCodeRiskAction(true)}
      />
    </>
  )
}