import 'dart:async';
import 'dart:io';
import 'dart:convert';
import '../../data/models/appconfig.dart';
import '../../data/models/appconfig_model.dart';
import 'package:flutter_dotenv/flutter_dotenv.dart';
import 'package:get_storage/get_storage.dart';
import 'package:open_ai_service/open_ai_service.dart';
import 'package:get/get.dart';
import 'ai_service.dart';
import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';

/// 定义流事件类型，用于区分不同类型的事件
enum StreamEventType { token, functionCall, complete, error }

/// 流事件包装类
class StreamEvent {
  final StreamEventType type;
  final String? content;
  final Map? meta;

  StreamEvent(this.type, {this.content, this.meta});
}

/// OpenAI服务适配器 - 连接AiService接口与OpenAIService插件
class OpenAIServiceAdapter implements AiService {
  final OpenAIService _openAIService = OpenAIService();
  StreamSubscription<OpenAIEvent>? _eventSubscription;
  final StreamController<StreamEvent> _tokenStreamController =
      StreamController<StreamEvent>.broadcast();
  final GetStorage _storage = GetStorage();

  /// 构造函数
  OpenAIServiceAdapter() {
    printInfo(info: '创建OpenAIServiceAdapter实例');
    _setupEventListener();
  }

  /// 设置事件监听器
  void _setupEventListener() {
    try {
      // 首先确保访问eventStream以初始化底层事件通道
      _openAIService.eventStream;

      // 设置事件处理
      _eventSubscription = _openAIService.eventStream.listen(
        (event) {
          try {
            switch (event.type) {
              case OpenAIEventType.token:
                if (event.content is String) {
                  _tokenStreamController.add(StreamEvent(StreamEventType.token,
                      content: event.content as String));
                } else {
                  printInfo(info: '收到非字符串类型的token: ${event.content}');
                }
                break;
              case OpenAIEventType.complete:
                _tokenStreamController
                    .add(StreamEvent(StreamEventType.complete));
                break;
              case OpenAIEventType.error:
                _tokenStreamController.add(StreamEvent(StreamEventType.error,
                    content: '未知错误: ${event.content}'));
                break;
              case OpenAIEventType.functionCall:
                printInfo(
                    info:
                        '接收到 functionCall content: ${event.content} meta: ${event.meta}');
                _tokenStreamController.add(StreamEvent(
                    StreamEventType.functionCall,
                    meta: event.meta as Map<String, dynamic>?));
                // _tokenStreamController.add(StreamEvent(
                //   StreamEventType.error,
                //   content: '收到函数调用，该流仅支持文本响应'
                // ));
                break;
            }
          } catch (e) {
            printError(info: '处理事件出错: $e');
            _tokenStreamController
                .add(StreamEvent(StreamEventType.error, content: '处理事件失败: $e'));
          }
        },
        onError: (error) {
          printError(info: '事件流错误: $error');
          _tokenStreamController.add(
              StreamEvent(StreamEventType.error, content: '事件流错误: $error'));
        },
        onDone: () {
          printInfo(info: '事件流已关闭');
        },
      );
    } catch (e) {
      printError(info: '设置事件监听器失败: $e');
    }
  }

  /// 初始化OpenAI服务
  Future<bool> initialize() async {
    try {
      // 从.env文件中读取配置
      // final apiKey = dotenv.env['OPENAI_API_KEY'] ?? '';
      // final baseUrl = dotenv.env['OPENAI_BASE_URL'] ?? '';
      // final model = dotenv.env['OPENAI_MODEL'] ?? '';
      // final _env = _storage.read("ENV") as Map<String, String>;
      final apiKey = AppConfig.env('OPENAI_API_KEY') ?? '';
      final baseUrl = AppConfig.env('OPENAI_BASE_URL') ?? '';
      final model = AppConfig.env('OPENAI_MODEL') ?? '';

      printInfo(info: '从.env读取OpenAI配置');
      printInfo(info: '基础URL: $baseUrl');
      printInfo(info: '模型名称: $model');

      if (apiKey.isEmpty) {
        printError(info: '错误: OpenAI API密钥未配置，请在.env文件中设置OPENAI_API_KEY');
        return false;
      }
      final _mcps = _storage.read("MCPS") as Map<String, DBMCPServer>;
      // 读取.mcp.json文件
      String mcpConfig = jsonEncode(_mcps);
      // try {
      //   // 从Flutter资源包中加载.mcp.json
      //   mcpConfig = await rootBundle.loadString('.mcp.json');
      //   printInfo(info: '成功从资源包加载.mcp.json配置文件');

      //   // 验证JSON格式
      //   final jsonData = jsonDecode(mcpConfig);
      //   if (jsonData is Map && jsonData.containsKey('mcpServers')) {
      //     printInfo(info: '解析到有效的mcpServers配置');
      //   } else {
      //     printInfo(info: '.mcp.json内容格式不正确，期望包含mcpServers字段');
      //   }
      // } catch (e) {
      //   printError(info: '加载.mcp.json资源文件时出错: $e');
      // }

      // 初始化OpenAI服务
      final result = await _openAIService.initialize(
        apiKey: apiKey,
        baseUrl: baseUrl,
        model: model,
        mcpServer: mcpConfig,
      );

      if (result) {
        printInfo(info: 'OpenAI服务初始化成功');
      } else {
        printError(info: 'OpenAI服务初始化失败');
      }

      return result;
    } catch (e) {
      printError(info: 'OpenAI服务初始化异常: $e');
      return false;
    }
  }

  /// 发送消息并获取回复
  @override
  Future<String> sendMessage({
    required List<Map<String, String>> messages,
    String? systemPrompt,
    String? userProperties,
  }) async {
    try {
      // 在方法内直接转换
      final convertedMessages =
          messages.map((m) => Map<String, dynamic>.from(m)).toList();

      // 发送消息并获取回复
      final response = await _openAIService.sendMessage(
        messages: convertedMessages,
        systemPrompt: systemPrompt,
        userProperties: userProperties,
      );

      return response;
    } catch (e) {
      printError(info: 'OpenAI发送消息失败: $e');
      throw '发送消息失败: $e';
    }
  }

  /// 发送消息并获取流式回复
  @override
  Stream sendMessageStream({
    required List<Map<String, String>> messages,
    String? systemPrompt, //提示词
    String? userProperties, //用户属性
  }) async* {
    try {
      // 在方法内直接转换
      final convertedMessages =
          messages.map((m) => Map<String, dynamic>.from(m)).toList();

      // 创建用于接收token的控制器
      final localController = StreamController();

      // 添加从广播流到本地流的订阅
      final subscription = _tokenStreamController.stream.listen((streamEvent) {
        switch (streamEvent.type) {
          case StreamEventType.token:
            if (streamEvent.content != null && !localController.isClosed) {
              localController.add(streamEvent.content!);
            }
            break;
          case StreamEventType.functionCall:
            if (streamEvent.meta != null && !localController.isClosed) {
              localController.add(streamEvent.meta!);
            }
            break;
          case StreamEventType.complete:
            if (!localController.isClosed) {
              localController.close();
            }
            break;
          case StreamEventType.error:
            if (!localController.isClosed) {
              printError(info: '令牌流错误: ${streamEvent.content}');
              localController.addError(streamEvent.content ?? '未知错误');
              localController.close();
            }
            break;
        }
      });

      // 当本地控制器关闭时，取消订阅
      localController.onCancel = () {
        subscription.cancel();
      };

      // 启动流式消息请求
      bool started = false;
      try {
        started = await _openAIService.sendMessageStream(
          messages: convertedMessages,
          systemPrompt: systemPrompt,
          userProperties: userProperties,
        );
      } catch (e) {
        printError(info: '启动消息流失败: $e');
        if (!localController.isClosed) {
          localController.addError('启动消息流失败: $e');
          localController.close();
        }
        throw '启动消息流失败: $e';
      }

      if (!started) {
        printError(info: '无法启动消息流');
        if (!localController.isClosed) {
          localController.addError('无法启动消息流');
          localController.close();
        }
        throw '无法启动消息流';
      }

      // 通过yield*将controller的流转发
      yield* localController.stream;
    } catch (e) {
      printError(info: 'OpenAI流式消息处理失败: $e');
      throw '流式消息处理失败: $e';
    }
  }

  /// 注册函数
  Future<bool> registerFunction(
      String name, String description, Map<String, dynamic> parameters) async {
    try {
      final result = await _openAIService.registerFunction(
        name: name,
        description: description,
        parameters: parameters,
      );

      if (result) {
        printInfo(info: '函数 "$name" 注册成功');
      } else {
        printError(info: '函数 "$name" 注册失败');
      }

      return result;
    } catch (e) {
      printError(info: '注册函数失败: $e');
      return false;
    }
  }

  /// 释放资源
  void dispose() {
    try {
      _eventSubscription?.cancel();
      _tokenStreamController.close();
      printInfo(info: 'OpenAIServiceAdapter资源已释放');
    } catch (e) {
      printError(info: '释放资源时出错: $e');
    }
  }
}