{"repo": "angri450/nong.nanobot.net", "files": {"Nanobot.Core/Providers/DeepSeekV4Provider.cs": {"5415f25b81e5b00141b1674c1992f07168045135": {"t": 1785746199.4491425, "n": 15847, "h": "56d422aaae48cdce", "c": "using System.Runtime.CompilerServices;\nusing System.Text;\nusing System.Text.Json;\nusing System.Text.Json.Nodes;\nusing Nanobot.Core.Models;\n\nnamespace Nanobot.Core.Providers;\n\npublic class DeepSeekV4Provider : IStreamingLLMProvider\n{\n    private const string DefaultBaseUrl = \"https://api.deepseek.com\";\n\n    private readonly string _apiKey;\n    private readonly string _apiBase;\n    private readonly HttpClient _httpClient;\n    private readonly DeepSeekV4Options _options;\n    private readonly DeepSeekV4Profile _profile;\n\n    public DeepSeekV4Provider(\n        string apiKey,\n        string? apiBase = null,\n        DeepSeekV4Options? options = null,\n        HttpClient? httpClient = null)\n    {\n        _apiKey = apiKey;\n        _apiBase = (apiBase ?? DefaultBaseUrl).TrimEnd('/');\n        _httpClient = httpClient ?? new HttpClient();\n        _options = options ?? new DeepSeekV4Options();\n        _profile = DeepSeekV4Models.GetProfile(_options.Model ?? DeepSeekV4Models.Flash);\n    }\n\n    public string GetDefaultModel() => _options.Model ?? DeepSeekV4Models.Flash;\n\n    public DeepSeekV4Profile Profile => _profile;\n\n    public async Task<LLMResponse> ChatAsync(\n        List<Message> messages,\n        List<JsonNode>? tools = null,\n        string? model = null,\n        int maxTokens = 4096,\n        double temperature = 0.7)\n    {\n        var body = BuildRequestBody(messages, tools, model ?? GetDefaultModel(), maxTokens, temperature, stream: false);\n        return await SendRequestAsync(body);\n    }\n\n    public async IAsyncEnumerable<LLMStreamChunk> ChatStreamAsync(\n        List<Message> messages,\n        List<JsonNode>? tools = null,\n        string? model = null,\n        int maxTokens = 4096,\n        double temperature = 0.7,\n        [EnumeratorCancellation] CancellationToken cancellationToken = default)\n    {\n        var body = BuildRequestBody(messages, tools, model ?? GetDefaultModel(), maxTokens, temperature, stream: true);\n        var request = CreateRequest(body);\n\n        using var response = await _httpClient.SendAsync(\n            request,\n            HttpCompletionOption.ResponseHeadersRead,\n            cancellationToken);\n\n        if (!response.IsSuccessStatusCode)\n        {\n            var errorBody = await response.Content.ReadAsStringAsync(cancellationToken);\n            yield return LLMStreamChunk.Delta($\"Error: DeepSeek returned {(int)response.StatusCode}: {errorBody}\");\n            yield return LLMStreamChunk.Final(new LLMResponse($\"Error: DeepSeek returned {(int)response.StatusCode}: {errorBody}\")\n            {\n                FinishReason = \"error\"\n            });\n            yield break;\n        }\n\n        await using var stream = await response.Content.ReadAsStreamAsync(cancellationToken);\n        using var reader = new StreamReader(stream);\n        var parser = new DeepSeekStreamParser();\n\n        await foreach (var data in ReadSseDataAsync(reader, cancellationToken))\n        {\n            if (data == \"[DONE]\")\n            {\n                break;\n            }\n\n            foreach (var chunk in parser.Apply(data))\n            {\n                yield return chunk;\n            }\n        }\n\n        yield return LLMStreamChunk.Final(parser.BuildResponse(GetDefaultModel()));\n    }\n\n    private async Task<LLMResponse> SendRequestAsync(JsonObject body)\n    {\n        var request = CreateRequest(body);\n        try\n        {\n            using var response = await _httpClient.SendAsync(request);\n            var content = await response.Content.ReadAsStringAsync();\n            if (!response.IsSuccessStatusCode)\n            {\n                return new LLMResponse($\"Error: DeepSeek returned {(int)response.StatusCode}: {content}\")\n                {\n                    FinishReason = \"error\"\n                };\n            }\n\n            return ParseNonStreamingResponse(content);\n        }\n        catch (Exception ex)\n        {\n            return new LLMResponse($\"Error: {ex.Message}\") { FinishReason = \"error\" };\n        }\n    }\n\n    private JsonObject BuildRequestBody(\n        List<Message> messages,\n        List<JsonNode>? tools,\n        string model,\n        int maxTokens,\n        double temperature,\n        bool stream)\n    {\n        var body = new JsonObject\n        {\n            [\"model\"] = model,\n            [\"messages\"] = new JsonArray(messages.Select(MessageToJson).ToArray()),\n            [\"max_tokens\"] = maxTokens,\n            [\"stream\"] = stream\n        };\n\n        // Only send temperature when thinking is off (DeepSeek ignores it otherwise)\n        if (_options.Thinking == DeepSeekV4Options.ThinkingMode.Off)\n        {\n            body[\"temperature\"] = temperature;\n        }\n\n        // Thinking mode\n        if (_options.Thinking != DeepSeekV4Options.ThinkingMode.Auto)\n        {\n            body[\"thinking\"] = new JsonObject\n            {\n                [\"type\"] = _options.IsThinkingEnabled ? \"enabled\" : \"disabled\"\n            };\n\n            if (_options.IsThinkingEnabled)\n            {\n                body[\"reasoning_effort\"] = _options.ReasoningEffort;\n            }\n        }\n\n        // Stream options for usage in final chunk\n        if (stream && _options.IncludeStreamUsage)\n        {\n            body[\"stream_options\"] = new JsonObject\n            {\n                [\"include_usage\"] = true\n            };\n        }\n\n        // Tools\n        if (tools is { Count: > 0 })\n        {\n            var toolArray = new JsonArray();\n            foreach (var tool in tools)\n            {\n                toolArray.Add(tool.DeepClone());\n            }\n\n            body[\"tools\"] = toolArray;\n        }\n\n        return body;\n    }\n\n    private static JsonObject MessageToJson(Message message)\n    {\n        var node = new JsonObject\n        {\n            [\"role\"] = message.Role.ToLowerInvariant()\n        };\n\n        if (!string.IsNullOrEmpty(message.Content))\n        {\n            node[\"content\"] = message.Content;\n        }\n        else\n        {\n            node[\"content\"] = \"\";\n        }\n\n        // Handle tool result messages\n        if (message.Role.Equals(\"tool\", StringComparison.OrdinalIgnoreCase))\n        {\n            if (!string.IsNullOrEmpty(message.ToolCallId))\n            {\n                node[\"tool_call_id\"] = message.ToolCallId;\n            }\n\n            return node;\n        }\n\n        // Handle assistant messages with tool calls\n        if (message.Role.Equals(\"assistant\", StringComparison.OrdinalIgnoreCase)\n            && message.ToolCalls is { Count: > 0 })\n        {\n            var toolCallsArray = new JsonArray();\n            foreach (var tc in message.ToolCalls)\n            {\n                toolCallsArray.Add(new JsonObject\n                {\n                    [\"id\"] = tc.Id,\n                    [\"type\"] = \"function\",\n                    [\"function\"] = new JsonObject\n                    {\n                        [\"name\"] = tc.Name,\n                        [\"arguments\"] = tc.Arguments?.ToJsonString() ?? \"{}\"\n                    }\n                });\n            }\n\n            node[\"tool_calls\"] = toolCallsArray;\n\n            // Keep reasoning_content for tool-call history (required by DeepSeek V4)\n            if (!string.IsNullOrEmpty(message.ReasoningContent))\n            {\n                node[\"reasoning_content\"] = message.ReasoningContent;\n            }\n        }\n\n        return node;\n    }\n\n    private HttpRequestMessage CreateRequest(JsonObject body)\n    {\n        var uri = $\"{_apiBase}/v1/chat/completions\";\n        var request = new HttpRequestMessage(HttpMethod.Post, uri)\n        {\n            Content = new StringContent(body.ToJsonString(), Encoding.UTF8, \"application/json\")\n        };\n        request.Headers.Add(\"Authorization\", $\"Bearer {_apiKey}\");\n        request.Headers.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue(\n            body[\"stream\"]?.GetValue<bool>() == true ? \"text/event-stream\" : \"application/json\"));\n        return request;\n    }\n\n    private LLMResponse ParseNonStreamingResponse(string json)\n    {\n        var root = JsonNode.Parse(json) as JsonObject ?? new JsonObject();\n        var choice = root[\"choices\"]?[0] as JsonObject;\n        var message = choice?[\"message\"] as JsonObject;\n\n        var response = new LLMResponse\n        {\n            Content = message?[\"content\"]?.ToString(),\n            FinishReason = choice?[\"finish_reason\"]?.ToString() ?? \"stop\",\n            ReasoningContent = message?[\"reasoning_content\"]?.ToString(),\n            Model = root[\"model\"]?.ToString(),\n            Usage = ParseDeepSeekUsage(root[\"usage\"] as JsonObject)\n        };\n\n        if (message?[\"tool_calls\"] is JsonArray toolCalls)\n        {\n            foreach (var tc in toolCalls.OfType<JsonObject>())\n            {\n                var function = tc[\"function\"] as JsonObject;\n                JsonNode? args = null;\n                try { args = JsonNode.Parse(function?[\"arguments\"]?.ToString() ?? \"{}\"); }\n                catch { /* keep null */ }\n\n                response.ToolCalls.Add(new ToolCallRequest(\n                    tc[\"id\"]?.ToString() ?? Guid.NewGuid().ToString(\"N\"),\n                    function?[\"name\"]?.ToString() ?? \"unknown\",\n                    args));\n            }\n        }\n\n        return response;\n    }\n\n    public static LLMUsage ParseDeepSeekUsage(JsonObject? usage)\n    {\n        if (usage is null)\n        {\n            return LLMUsage.Basic(0, 0);\n        }\n\n        var promptTokens = usage[\"prompt_tokens\"]?.GetValue<int>() ?? 0;\n        var completionTokens = usage[\"completion_tokens\"]?.GetValue<int>() ?? 0;\n        var cacheHitTokens = usage[\"prompt_cache_hit_tokens\"]?.GetValue<int>() ?? 0;\n        var cacheMissTokens = usage[\"prompt_cache_miss_tokens\"]?.GetValue<int>() ?? 0;\n        var reasoningTokens = usage[\"completion_tokens_details\"] is JsonObject details\n            ? details[\"reasoning_tokens\"]?.GetValue<int>() ?? 0\n            : 0;\n\n        return LLMUsage.FromDeepSeekResponse(promptTokens, cacheHitTokens, cacheMissTokens, completionTokens, reasoningTokens);\n    }\n\n    private static async IAsyncEnumerable<string> ReadSseDataAsync(\n        StreamReader reader,\n        [EnumeratorCancellation] CancellationToken cancellationToken)\n    {\n        var data = new StringBuilder();\n        while (!cancellationToken.IsCancellationRequested)\n        {\n            var line = await reader.ReadLineAsync(cancellationToken);\n            if (line is null)\n            {\n                break;\n            }\n\n            if (line.Length == 0)\n            {\n                if (data.Length > 0)\n                {\n                    yield return data.ToString();\n                    data.Clear();\n                }\n\n                continue;\n            }\n\n            if (line.StartsWith(\"data:\", StringComparison.OrdinalIgnoreCase))\n            {\n                if (data.Length > 0)\n                {\n                    data.Append('\\n');\n                }\n\n                data.Append(line[\"data:\".Length..].Trim());\n            }\n        }\n\n        if (data.Length > 0)\n        {\n            yield return data.ToString();\n        }\n    }\n\n    private sealed class DeepSeekStreamParser\n    {\n        private readonly StringBuilder _content = new();\n        private readonly StringBuilder _reasoning = new();\n        private readonly Dictionary<int, ToolCallAccumulator> _toolCallsByIndex = new();\n        private string _finishReason = \"stop\";\n        private LLMUsage? _usage;\n\n        public IReadOnlyList<LLMStreamChunk> Apply(string json)\n        {\n            var chunks = new List<LLMStreamChunk>();\n            var root = JsonNode.Parse(json) as JsonObject;\n            if (root is null) return chunks;\n\n            var choices = root[\"choices\"];\n            if (choices is null) return chunks;\n\n            var choice = choices[0] as JsonObject;\n            if (choice is null) return chunks;\n\n            var delta = choice[\"delta\"] as JsonObject;\n\n            // Reasoning delta\n            if (delta is not null)\n            {\n                var reasoningDelta = delta[\"reasoning_content\"]?.ToString();\n                if (!string.IsNullOrEmpty(reasoningDelta))\n                {\n                    _reasoning.Append(reasoningDelta);\n                    chunks.Add(LLMStreamChunk.Reasoning(reasoningDelta));\n                }\n\n                // Content delta\n                var contentDelta = delta[\"content\"]?.ToString();\n                if (!string.IsNullOrEmpty(contentDelta))\n                {\n                    _content.Append(contentDelta);\n                    chunks.Add(LLMStreamChunk.Delta(contentDelta));\n                }\n\n                // Tool call deltas\n                if (delta[\"tool_calls\"] is JsonArray toolCalls)\n                {\n                    foreach (var item in toolCalls.OfType<JsonObject>())\n                    {\n                        var index = item[\"index\"]?.GetValue<int>() ?? 0;\n                        if (!_toolCallsByIndex.TryGetValue(index, out var accumulator))\n                        {\n                            accumulator = new ToolCallAccumulator();\n                            _toolCallsByIndex[index] = accumulator;\n                        }\n\n                        if (!string.IsNullOrWhiteSpace(item[\"id\"]?.ToString()))\n                        {\n                            accumulator.Id = item[\"id\"]!.ToString();\n                        }\n\n                        var function = item[\"function\"] as JsonObject;\n                        if (!string.IsNullOrWhiteSpace(function?[\"name\"]?.ToString()))\n                        {\n                            accumulator.Name = function![\"name\"]!.ToString();\n                        }\n\n                        if (function?[\"arguments\"] is JsonNode args)\n                        {\n                            accumulator.Arguments.Append(args.ToString());\n                        }\n                    }\n                }\n            }\n\n            // Finish reason\n            var finishReason = choice[\"finish_reason\"]?.ToString();\n            if (!string.IsNullOrWhiteSpace(finishReason))\n            {\n                _finishReason = finishReason;\n            }\n\n            // Usage (from stream_options.include_usage final chunk)\n            var usage = root[\"usage\"] as JsonObject;\n            if (usage is not null)\n            {\n                _usage = ParseDeepSeekUsage(usage);\n            }\n\n            return chunks;\n        }\n\n        public LLMResponse BuildResponse(string model)\n        {\n            var response = new LLMResponse\n            {\n                Content = _content.Length == 0 ? null : _content.ToString(),\n                ReasoningContent = _reasoning.Length == 0 ? null : _reasoning.ToString(),\n                FinishReason = _finishReason,\n                Usage = _usage,\n                Model = model,\n                Provider = \"deepseek\"\n            };\n\n            foreach (var accumulator in _toolCallsByIndex.Values)\n            {\n                if (string.IsNullOrWhiteSpace(accumulator.Name))\n                {\n                    continue;\n                }\n\n                JsonNode? args = null;\n                try\n                {\n                    args = JsonNode.Parse(accumulator.Arguments.Length == 0 ? \"{}\" : accumulator.Arguments.ToString());\n                }\n                catch { /* keep null */ }\n\n                response.ToolCalls.Add(new ToolCallRequest(\n                    string.IsNullOrWhiteSpace(accumulator.Id) ? Guid.NewGuid().ToString(\"N\") : accumulator.Id,\n                    accumulator.Name,\n                    args));\n            }\n\n            return response;\n        }\n    }\n\n    private sealed class ToolCallAccumulator\n    {\n        public string? Id { get; set; }\n        public string? Name { get; set; }\n        public StringBuilder Arguments { get; } = new();\n    }\n}\n"}, "ead7343727376a8374eab207827e4f00f2572d58": {"t": 1785760541.127495, "n": 15847, "h": "56d422aaae48cdce", "c": "using System.Runtime.CompilerServices;\nusing System.Text;\nusing System.Text.Json;\nusing System.Text.Json.Nodes;\nusing Nanobot.Core.Models;\n\nnamespace Nanobot.Core.Providers;\n\npublic class DeepSeekV4Provider : IStreamingLLMProvider\n{\n    private const string DefaultBaseUrl = \"https://api.deepseek.com\";\n\n    private readonly string _apiKey;\n    private readonly string _apiBase;\n    private readonly HttpClient _httpClient;\n    private readonly DeepSeekV4Options _options;\n    private readonly DeepSeekV4Profile _profile;\n\n    public DeepSeekV4Provider(\n        string apiKey,\n        string? apiBase = null,\n        DeepSeekV4Options? options = null,\n        HttpClient? httpClient = null)\n    {\n        _apiKey = apiKey;\n        _apiBase = (apiBase ?? DefaultBaseUrl).TrimEnd('/');\n        _httpClient = httpClient ?? new HttpClient();\n        _options = options ?? new DeepSeekV4Options();\n        _profile = DeepSeekV4Models.GetProfile(_options.Model ?? DeepSeekV4Models.Flash);\n    }\n\n    public string GetDefaultModel() => _options.Model ?? DeepSeekV4Models.Flash;\n\n    public DeepSeekV4Profile Profile => _profile;\n\n    public async Task<LLMResponse> ChatAsync(\n        List<Message> messages,\n        List<JsonNode>? tools = null,\n        string? model = null,\n        int maxTokens = 4096,\n        double temperature = 0.7)\n    {\n        var body = BuildRequestBody(messages, tools, model ?? GetDefaultModel(), maxTokens, temperature, stream: false);\n        return await SendRequestAsync(body);\n    }\n\n    public async IAsyncEnumerable<LLMStreamChunk> ChatStreamAsync(\n        List<Message> messages,\n        List<JsonNode>? tools = null,\n        string? model = null,\n        int maxTokens = 4096,\n        double temperature = 0.7,\n        [EnumeratorCancellation] CancellationToken cancellationToken = default)\n    {\n        var body = BuildRequestBody(messages, tools, model ?? GetDefaultModel(), maxTokens, temperature, stream: true);\n        var request = CreateRequest(body);\n\n        using var response = await _httpClient.SendAsync(\n            request,\n            HttpCompletionOption.ResponseHeadersRead,\n            cancellationToken);\n\n        if (!response.IsSuccessStatusCode)\n        {\n            var errorBody = await response.Content.ReadAsStringAsync(cancellationToken);\n            yield return LLMStreamChunk.Delta($\"Error: DeepSeek returned {(int)response.StatusCode}: {errorBody}\");\n            yield return LLMStreamChunk.Final(new LLMResponse($\"Error: DeepSeek returned {(int)response.StatusCode}: {errorBody}\")\n            {\n                FinishReason = \"error\"\n            });\n            yield break;\n        }\n\n        await using var stream = await response.Content.ReadAsStreamAsync(cancellationToken);\n        using var reader = new StreamReader(stream);\n        var parser = new DeepSeekStreamParser();\n\n        await foreach (var data in ReadSseDataAsync(reader, cancellationToken))\n        {\n            if (data == \"[DONE]\")\n            {\n                break;\n            }\n\n            foreach (var chunk in parser.Apply(data))\n            {\n                yield return chunk;\n            }\n        }\n\n        yield return LLMStreamChunk.Final(parser.BuildResponse(GetDefaultModel()));\n    }\n\n    private async Task<LLMResponse> SendRequestAsync(JsonObject body)\n    {\n        var request = CreateRequest(body);\n        try\n        {\n            using var response = await _httpClient.SendAsync(request);\n            var content = await response.Content.ReadAsStringAsync();\n            if (!response.IsSuccessStatusCode)\n            {\n                return new LLMResponse($\"Error: DeepSeek returned {(int)response.StatusCode}: {content}\")\n                {\n                    FinishReason = \"error\"\n                };\n            }\n\n            return ParseNonStreamingResponse(content);\n        }\n        catch (Exception ex)\n        {\n            return new LLMResponse($\"Error: {ex.Message}\") { FinishReason = \"error\" };\n        }\n    }\n\n    private JsonObject BuildRequestBody(\n        List<Message> messages,\n        List<JsonNode>? tools,\n        string model,\n        int maxTokens,\n        double temperature,\n        bool stream)\n    {\n        var body = new JsonObject\n        {\n            [\"model\"] = model,\n            [\"messages\"] = new JsonArray(messages.Select(MessageToJson).ToArray()),\n            [\"max_tokens\"] = maxTokens,\n            [\"stream\"] = stream\n        };\n\n        // Only send temperature when thinking is off (DeepSeek ignores it otherwise)\n        if (_options.Thinking == DeepSeekV4Options.ThinkingMode.Off)\n        {\n            body[\"temperature\"] = temperature;\n        }\n\n        // Thinking mode\n        if (_options.Thinking != DeepSeekV4Options.ThinkingMode.Auto)\n        {\n            body[\"thinking\"] = new JsonObject\n            {\n                [\"type\"] = _options.IsThinkingEnabled ? \"enabled\" : \"disabled\"\n            };\n\n            if (_options.IsThinkingEnabled)\n            {\n                body[\"reasoning_effort\"] = _options.ReasoningEffort;\n            }\n        }\n\n        // Stream options for usage in final chunk\n        if (stream && _options.IncludeStreamUsage)\n        {\n            body[\"stream_options\"] = new JsonObject\n            {\n                [\"include_usage\"] = true\n            };\n        }\n\n        // Tools\n        if (tools is { Count: > 0 })\n        {\n            var toolArray = new JsonArray();\n            foreach (var tool in tools)\n            {\n                toolArray.Add(tool.DeepClone());\n            }\n\n            body[\"tools\"] = toolArray;\n        }\n\n        return body;\n    }\n\n    private static JsonObject MessageToJson(Message message)\n    {\n        var node = new JsonObject\n        {\n            [\"role\"] = message.Role.ToLowerInvariant()\n        };\n\n        if (!string.IsNullOrEmpty(message.Content))\n        {\n            node[\"content\"] = message.Content;\n        }\n        else\n        {\n            node[\"content\"] = \"\";\n        }\n\n        // Handle tool result messages\n        if (message.Role.Equals(\"tool\", StringComparison.OrdinalIgnoreCase))\n        {\n            if (!string.IsNullOrEmpty(message.ToolCallId))\n            {\n                node[\"tool_call_id\"] = message.ToolCallId;\n            }\n\n            return node;\n        }\n\n        // Handle assistant messages with tool calls\n        if (message.Role.Equals(\"assistant\", StringComparison.OrdinalIgnoreCase)\n            && message.ToolCalls is { Count: > 0 })\n        {\n            var toolCallsArray = new JsonArray();\n            foreach (var tc in message.ToolCalls)\n            {\n                toolCallsArray.Add(new JsonObject\n                {\n                    [\"id\"] = tc.Id,\n                    [\"type\"] = \"function\",\n                    [\"function\"] = new JsonObject\n                    {\n                        [\"name\"] = tc.Name,\n                        [\"arguments\"] = tc.Arguments?.ToJsonString() ?? \"{}\"\n                    }\n                });\n            }\n\n            node[\"tool_calls\"] = toolCallsArray;\n\n            // Keep reasoning_content for tool-call history (required by DeepSeek V4)\n            if (!string.IsNullOrEmpty(message.ReasoningContent))\n            {\n                node[\"reasoning_content\"] = message.ReasoningContent;\n            }\n        }\n\n        return node;\n    }\n\n    private HttpRequestMessage CreateRequest(JsonObject body)\n    {\n        var uri = $\"{_apiBase}/v1/chat/completions\";\n        var request = new HttpRequestMessage(HttpMethod.Post, uri)\n        {\n            Content = new StringContent(body.ToJsonString(), Encoding.UTF8, \"application/json\")\n        };\n        request.Headers.Add(\"Authorization\", $\"Bearer {_apiKey}\");\n        request.Headers.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue(\n            body[\"stream\"]?.GetValue<bool>() == true ? \"text/event-stream\" : \"application/json\"));\n        return request;\n    }\n\n    private LLMResponse ParseNonStreamingResponse(string json)\n    {\n        var root = JsonNode.Parse(json) as JsonObject ?? new JsonObject();\n        var choice = root[\"choices\"]?[0] as JsonObject;\n        var message = choice?[\"message\"] as JsonObject;\n\n        var response = new LLMResponse\n        {\n            Content = message?[\"content\"]?.ToString(),\n            FinishReason = choice?[\"finish_reason\"]?.ToString() ?? \"stop\",\n            ReasoningContent = message?[\"reasoning_content\"]?.ToString(),\n            Model = root[\"model\"]?.ToString(),\n            Usage = ParseDeepSeekUsage(root[\"usage\"] as JsonObject)\n        };\n\n        if (message?[\"tool_calls\"] is JsonArray toolCalls)\n        {\n            foreach (var tc in toolCalls.OfType<JsonObject>())\n            {\n                var function = tc[\"function\"] as JsonObject;\n                JsonNode? args = null;\n                try { args = JsonNode.Parse(function?[\"arguments\"]?.ToString() ?? \"{}\"); }\n                catch { /* keep null */ }\n\n                response.ToolCalls.Add(new ToolCallRequest(\n                    tc[\"id\"]?.ToString() ?? Guid.NewGuid().ToString(\"N\"),\n                    function?[\"name\"]?.ToString() ?? \"unknown\",\n                    args));\n            }\n        }\n\n        return response;\n    }\n\n    public static LLMUsage ParseDeepSeekUsage(JsonObject? usage)\n    {\n        if (usage is null)\n        {\n            return LLMUsage.Basic(0, 0);\n        }\n\n        var promptTokens = usage[\"prompt_tokens\"]?.GetValue<int>() ?? 0;\n        var completionTokens = usage[\"completion_tokens\"]?.GetValue<int>() ?? 0;\n        var cacheHitTokens = usage[\"prompt_cache_hit_tokens\"]?.GetValue<int>() ?? 0;\n        var cacheMissTokens = usage[\"prompt_cache_miss_tokens\"]?.GetValue<int>() ?? 0;\n        var reasoningTokens = usage[\"completion_tokens_details\"] is JsonObject details\n            ? details[\"reasoning_tokens\"]?.GetValue<int>() ?? 0\n            : 0;\n\n        return LLMUsage.FromDeepSeekResponse(promptTokens, cacheHitTokens, cacheMissTokens, completionTokens, reasoningTokens);\n    }\n\n    private static async IAsyncEnumerable<string> ReadSseDataAsync(\n        StreamReader reader,\n        [EnumeratorCancellation] CancellationToken cancellationToken)\n    {\n        var data = new StringBuilder();\n        while (!cancellationToken.IsCancellationRequested)\n        {\n            var line = await reader.ReadLineAsync(cancellationToken);\n            if (line is null)\n            {\n                break;\n            }\n\n            if (line.Length == 0)\n            {\n                if (data.Length > 0)\n                {\n                    yield return data.ToString();\n                    data.Clear();\n                }\n\n                continue;\n            }\n\n            if (line.StartsWith(\"data:\", StringComparison.OrdinalIgnoreCase))\n            {\n                if (data.Length > 0)\n                {\n                    data.Append('\\n');\n                }\n\n                data.Append(line[\"data:\".Length..].Trim());\n            }\n        }\n\n        if (data.Length > 0)\n        {\n            yield return data.ToString();\n        }\n    }\n\n    private sealed class DeepSeekStreamParser\n    {\n        private readonly StringBuilder _content = new();\n        private readonly StringBuilder _reasoning = new();\n        private readonly Dictionary<int, ToolCallAccumulator> _toolCallsByIndex = new();\n        private string _finishReason = \"stop\";\n        private LLMUsage? _usage;\n\n        public IReadOnlyList<LLMStreamChunk> Apply(string json)\n        {\n            var chunks = new List<LLMStreamChunk>();\n            var root = JsonNode.Parse(json) as JsonObject;\n            if (root is null) return chunks;\n\n            var choices = root[\"choices\"];\n            if (choices is null) return chunks;\n\n            var choice = choices[0] as JsonObject;\n            if (choice is null) return chunks;\n\n            var delta = choice[\"delta\"] as JsonObject;\n\n            // Reasoning delta\n            if (delta is not null)\n            {\n                var reasoningDelta = delta[\"reasoning_content\"]?.ToString();\n                if (!string.IsNullOrEmpty(reasoningDelta))\n                {\n                    _reasoning.Append(reasoningDelta);\n                    chunks.Add(LLMStreamChunk.Reasoning(reasoningDelta));\n                }\n\n                // Content delta\n                var contentDelta = delta[\"content\"]?.ToString();\n                if (!string.IsNullOrEmpty(contentDelta))\n                {\n                    _content.Append(contentDelta);\n                    chunks.Add(LLMStreamChunk.Delta(contentDelta));\n                }\n\n                // Tool call deltas\n                if (delta[\"tool_calls\"] is JsonArray toolCalls)\n                {\n                    foreach (var item in toolCalls.OfType<JsonObject>())\n                    {\n                        var index = item[\"index\"]?.GetValue<int>() ?? 0;\n                        if (!_toolCallsByIndex.TryGetValue(index, out var accumulator))\n                        {\n                            accumulator = new ToolCallAccumulator();\n                            _toolCallsByIndex[index] = accumulator;\n                        }\n\n                        if (!string.IsNullOrWhiteSpace(item[\"id\"]?.ToString()))\n                        {\n                            accumulator.Id = item[\"id\"]!.ToString();\n                        }\n\n                        var function = item[\"function\"] as JsonObject;\n                        if (!string.IsNullOrWhiteSpace(function?[\"name\"]?.ToString()))\n                        {\n                            accumulator.Name = function![\"name\"]!.ToString();\n                        }\n\n                        if (function?[\"arguments\"] is JsonNode args)\n                        {\n                            accumulator.Arguments.Append(args.ToString());\n                        }\n                    }\n                }\n            }\n\n            // Finish reason\n            var finishReason = choice[\"finish_reason\"]?.ToString();\n            if (!string.IsNullOrWhiteSpace(finishReason))\n            {\n                _finishReason = finishReason;\n            }\n\n            // Usage (from stream_options.include_usage final chunk)\n            var usage = root[\"usage\"] as JsonObject;\n            if (usage is not null)\n            {\n                _usage = ParseDeepSeekUsage(usage);\n            }\n\n            return chunks;\n        }\n\n        public LLMResponse BuildResponse(string model)\n        {\n            var response = new LLMResponse\n            {\n                Content = _content.Length == 0 ? null : _content.ToString(),\n                ReasoningContent = _reasoning.Length == 0 ? null : _reasoning.ToString(),\n                FinishReason = _finishReason,\n                Usage = _usage,\n                Model = model,\n                Provider = \"deepseek\"\n            };\n\n            foreach (var accumulator in _toolCallsByIndex.Values)\n            {\n                if (string.IsNullOrWhiteSpace(accumulator.Name))\n                {\n                    continue;\n                }\n\n                JsonNode? args = null;\n                try\n                {\n                    args = JsonNode.Parse(accumulator.Arguments.Length == 0 ? \"{}\" : accumulator.Arguments.ToString());\n                }\n                catch { /* keep null */ }\n\n                response.ToolCalls.Add(new ToolCallRequest(\n                    string.IsNullOrWhiteSpace(accumulator.Id) ? Guid.NewGuid().ToString(\"N\") : accumulator.Id,\n                    accumulator.Name,\n                    args));\n            }\n\n            return response;\n        }\n    }\n\n    private sealed class ToolCallAccumulator\n    {\n        public string? Id { get; set; }\n        public string? Name { get; set; }\n        public StringBuilder Arguments { get; } = new();\n    }\n}\n"}}}}