chore: 全面规范化代码，遵循 CLAUDE.md 编码规范
- C# 文件命名改为 snake_case（28 个文件重命名） - C# 类转换为主构造函数（8 个类） - 空 catch 添加异常类型（2 处） - 新建 GlobalUsings.cs（Health.Infrastructure、Health.WebApi） - Flutter 移除 go_router，改用 Riverpod 路由栈 - Flutter 移除 flutter_secure_storage，改用 sqflite 持久化 - 修复 Flutter 构建路径（Flutter SDK 迁至 D 盘） - 后端端口改为 0.0.0.0:5000，支持局域网访问
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MingNian
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using System.Net.Http.Headers;
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namespace Health.Infrastructure.AI;
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/// <summary>
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/// OpenAI 兼容协议 HTTP 客户端，统一调用 DeepSeek / 千问 VL
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/// </summary>
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public sealed class OpenAiCompatibleClient(string baseUrl, string apiKey, string model)
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{
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private readonly HttpClient _http = CreateHttpClient(baseUrl, apiKey);
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private readonly string _model = model;
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private readonly JsonSerializerOptions _jsonOptions = new()
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{
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PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower,
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PropertyNameCaseInsensitive = true
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};
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private static HttpClient CreateHttpClient(string baseUrl, string apiKey)
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{
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var client = new HttpClient
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{
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BaseAddress = new Uri(baseUrl.TrimEnd('/') + "/"),
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Timeout = TimeSpan.FromSeconds(60)
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};
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client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", apiKey);
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client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
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return client;
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}
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/// <summary>
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/// 流式 Chat Completions（SSE）
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/// </summary>
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public async IAsyncEnumerable<string> ChatStreamAsync(
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List<ChatMessage> messages,
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List<ToolDefinition>? tools = null,
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int maxTokens = 2048,
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float temperature = 0.7f)
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{
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var request = new ChatCompletionRequest
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{
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Model = _model,
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Messages = messages,
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Stream = true,
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MaxTokens = maxTokens,
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Temperature = temperature,
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Tools = tools,
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};
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if (tools?.Count > 0)
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request.ToolChoice = "auto";
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var json = JsonSerializer.Serialize(request, _jsonOptions);
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var content = new StringContent(json, Encoding.UTF8, "application/json");
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var httpRequest = new HttpRequestMessage(HttpMethod.Post, "chat/completions")
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{
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Content = content
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};
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httpRequest.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("text/event-stream"));
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var response = await _http.SendAsync(httpRequest, HttpCompletionOption.ResponseHeadersRead);
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response.EnsureSuccessStatusCode();
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using var stream = await response.Content.ReadAsStreamAsync();
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using var reader = new StreamReader(stream);
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string? line;
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while ((line = await reader.ReadLineAsync()) != null)
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{
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if (string.IsNullOrWhiteSpace(line)) continue;
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if (!line.StartsWith("data: ")) continue;
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var data = line["data: ".Length..];
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if (data == "[DONE]") break;
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yield return data;
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}
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}
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/// <summary>
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/// 非流式 Chat Completions
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/// </summary>
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public async Task<ChatCompletionResponse> ChatAsync(
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List<ChatMessage> messages,
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List<ToolDefinition>? tools = null,
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int maxTokens = 2048,
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float temperature = 0.7f)
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{
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var request = new ChatCompletionRequest
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{
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Model = _model,
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Messages = messages,
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Stream = false,
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MaxTokens = maxTokens,
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Temperature = temperature,
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Tools = tools,
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};
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if (tools?.Count > 0)
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request.ToolChoice = "auto";
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var json = JsonSerializer.Serialize(request, _jsonOptions);
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var content = new StringContent(json, Encoding.UTF8, "application/json");
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var response = await _http.PostAsync("chat/completions", content);
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response.EnsureSuccessStatusCode();
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var body = await response.Content.ReadAsStringAsync();
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return JsonSerializer.Deserialize<ChatCompletionResponse>(body, _jsonOptions)!;
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}
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/// <summary>
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/// Vision 图片理解（非流式）
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/// </summary>
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public async Task<ChatCompletionResponse> VisionAsync(
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string systemPrompt,
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List<string> imageUrls,
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string? userText = null,
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int maxTokens = 2048)
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{
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var messages = new List<ChatMessage>();
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if (!string.IsNullOrEmpty(systemPrompt))
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messages.Add(new ChatMessage { Role = "system", Content = systemPrompt });
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// 构建多模态消息内容
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var contentParts = new List<object>();
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foreach (var url in imageUrls)
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contentParts.Add(new { type = "image_url", image_url = new { url } });
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if (!string.IsNullOrEmpty(userText))
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contentParts.Add(new { type = "text", text = userText });
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var userMessage = new ChatMessage
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{
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Role = "user",
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Content = JsonSerializer.Serialize(contentParts, _jsonOptions)
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};
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messages.Add(userMessage);
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var request = new ChatCompletionRequest
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{
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Model = _model,
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Messages = messages,
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MaxTokens = maxTokens,
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Stream = false,
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};
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var json = JsonSerializer.Serialize(request, _jsonOptions);
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var content = new StringContent(json, Encoding.UTF8, "application/json");
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var response = await _http.PostAsync("chat/completions", content);
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response.EnsureSuccessStatusCode();
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var body = await response.Content.ReadAsStringAsync();
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return JsonSerializer.Deserialize<ChatCompletionResponse>(body, _jsonOptions)!;
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}
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}
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#region 请求/响应模型
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public sealed class ChatCompletionRequest
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{
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public string Model { get; set; } = string.Empty;
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public List<ChatMessage> Messages { get; set; } = [];
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public bool Stream { get; set; }
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public int MaxTokens { get; set; } = 2048;
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public float Temperature { get; set; } = 0.7f;
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public List<ToolDefinition>? Tools { get; set; }
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public string? ToolChoice { get; set; }
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}
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public sealed class ChatMessage
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{
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public string Role { get; set; } = string.Empty;
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public string Content { get; set; } = string.Empty;
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public string? ToolCallId { get; set; }
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public List<ToolCall>? ToolCalls { get; set; }
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}
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public sealed class ToolDefinition
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{
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public string Type { get; set; } = "function";
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public ToolFunction Function { get; set; } = new();
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}
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public sealed class ToolFunction
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{
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public string Name { get; set; } = string.Empty;
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public string Description { get; set; } = string.Empty;
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public object Parameters { get; set; } = new();
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}
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public sealed class ToolCall
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{
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public string Id { get; set; } = string.Empty;
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public string Type { get; set; } = "function";
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public ToolCallFunction Function { get; set; } = new();
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}
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public sealed class ToolCallFunction
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{
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public string Name { get; set; } = string.Empty;
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public string Arguments { get; set; } = string.Empty;
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}
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public sealed class ChatCompletionResponse
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{
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public string Id { get; set; } = string.Empty;
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public List<Choice> Choices { get; set; } = [];
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}
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public sealed class Choice
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{
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public int Index { get; set; }
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public ResponseMessage? Message { get; set; }
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public ResponseDelta? Delta { get; set; }
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public string? FinishReason { get; set; }
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}
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public sealed class ResponseMessage
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{
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public string Role { get; set; } = string.Empty;
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public string? Content { get; set; }
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public List<ToolCall>? ToolCalls { get; set; }
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}
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public sealed class ResponseDelta
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{
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public string? Content { get; set; }
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public string? Role { get; set; }
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}
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#endregion
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