Initial commit: 健康管家 AI 健康陪伴助手

- Backend: .NET 10 Minimal API + EF Core + PostgreSQL - Frontend: Flutter + Riverpod + GoRouter + Dio - AI: DeepSeek LLM + Qwen VLM (OpenAI-compatible) - Auth: SMS + JWT (access/refresh tokens) - Features: AI chat, health tracking, medication management, diet analysis, exercise plans, doctor consultations, report analysis
2026-06-02 11:11:29 +08:00
commit 14d7c30d3d
144 changed files with 11436 additions and 0 deletions
--- a/health_app/lib/providers/chat_provider.dart
+++ b/health_app/lib/providers/chat_provider.dart
@@ -0,0 +1,159 @@
+import 'dart:async';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'auth_provider.dart';
+import '../utils/sse_handler.dart';
+
+class ChatMessage {
+  final String id;
+  final String role;
+  String content;
+  final DateTime createdAt;
+  ChatMessage(
+      {required this.id,
+      required this.role,
+      required this.content,
+      required this.createdAt});
+  bool get isUser => role == 'user';
+}
+
+enum ActiveAgent { default_, consultation, health, diet, medication, report, exercise }
+
+class ChatState {
+  final ActiveAgent activeAgent;
+  final List<ChatMessage> messages;
+  final String? conversationId;
+  final bool isStreaming;
+  final String? noticeText;
+  const ChatState({
+    this.activeAgent = ActiveAgent.default_,
+    this.messages = const [],
+    this.conversationId,
+    this.isStreaming = false,
+    this.noticeText,
+  });
+  ChatState copyWith({ActiveAgent? activeAgent, List<ChatMessage>? messages,
+      String? conversationId, bool? isStreaming, String? noticeText,
+      bool clearNotice = false}) =>
+      ChatState(
+        activeAgent: activeAgent ?? this.activeAgent,
+        messages: messages ?? this.messages,
+        conversationId: conversationId ?? this.conversationId,
+        isStreaming: isStreaming ?? this.isStreaming,
+        noticeText: clearNotice ? null : (noticeText ?? this.noticeText),
+      );
+}
+
+class SelectedAgentNotifier extends Notifier<ActiveAgent?> {
+  @override
+  ActiveAgent? build() => null;
+  void select(ActiveAgent? a) => state = a;
+}
+
+final selectedAgentProvider =
+    NotifierProvider<SelectedAgentNotifier, ActiveAgent?>(SelectedAgentNotifier.new);
+final chatProvider = NotifierProvider<ChatNotifier, ChatState>(ChatNotifier.new);
+
+class ChatNotifier extends Notifier<ChatState> {
+  StreamSubscription<Map<String, dynamic>>? _subscription;
+
+  @override
+  ChatState build() => const ChatState();
+
+  void setAgent(ActiveAgent a) {
+    _subscription?.cancel();
+    state = state.activeAgent == a ? const ChatState() : ChatState(activeAgent: a);
+  }
+
+  Future<void> sendMessage(String text) async {
+    if (text.trim().isEmpty || state.isStreaming) return;
+
+    final userMsg = ChatMessage(
+      id: '${DateTime.now().millisecondsSinceEpoch}',
+      role: 'user',
+      content: text,
+      createdAt: DateTime.now(),
+    );
+    state = state.copyWith(
+        messages: [...state.messages, userMsg], isStreaming: true);
+
+    final aiMsg = ChatMessage(
+      id: '${DateTime.now().millisecondsSinceEpoch}_ai',
+      role: 'assistant',
+      content: '',
+      createdAt: DateTime.now(),
+    );
+
+    try {
+      final token = await ref.read(apiClientProvider).accessToken;
+      if (token == null) {
+        _addError(aiMsg, '未登录，请重新登录');
+        return;
+      }
+
+      final agentPath =
+          state.activeAgent.name.replaceFirst('default_', 'default');
+      final stream = SseHandler.connect(
+        agentType: agentPath,
+        message: text,
+        conversationId: state.conversationId,
+        token: token,
+      );
+
+      await for (final event in stream) {
+        _processEvent(event, aiMsg);
+      }
+    } catch (e) {
+      _addError(aiMsg, '网络异常，请稍后重试');
+    }
+  }
+
+  void _addError(ChatMessage aiMsg, String errorText) {
+    state = state.copyWith(
+      messages: [
+        ...state.messages,
+        ChatMessage(
+          id: 'err_${DateTime.now().millisecondsSinceEpoch}',
+          role: 'assistant',
+          content: errorText,
+          createdAt: DateTime.now(),
+        ),
+      ],
+      isStreaming: false,
+      clearNotice: true,
+    );
+  }
+
+  void _processEvent(Map<String, dynamic> j, ChatMessage aiMsg) {
+    final a = j['action'] as String?;
+    switch (a) {
+      case 'conversation_id':
+        state = state.copyWith(conversationId: j['data']?.toString());
+      case 'answer':
+        aiMsg.content += (j['data'] as String?) ?? '';
+        _update(aiMsg);
+      case 'notice':
+        state = state.copyWith(noticeText: j['message'] as String?);
+      case 'status':
+        _done(aiMsg);
+      case 'error':
+        _done(aiMsg);
+    }
+  }
+
+  void _update(ChatMessage m) {
+    final u = state.messages.toList();
+    final i = u.indexWhere((x) => x.id == m.id);
+    if (i >= 0) {
+      u[i] = m;
+    } else if (m.content.isNotEmpty) {
+      u.add(m);
+    }
+    state = state.copyWith(messages: u);
+  }
+
+  void _done(ChatMessage m) {
+    final u = state.messages.toList();
+    if (!u.any((x) => x.id == m.id) && m.content.isNotEmpty) u.add(m);
+    state = state.copyWith(messages: u, isStreaming: false, clearNotice: true);
+  }
+}