import Config from './config.js'
import http from './http.js'
import store from '@/store/index.js'

export default {
  /**
   * 发送消息到Dify API
   * @param {string} message 用户消息内容
   * @param {Object} options 配置选项
   * @returns {Promise} 
   */
  async sendMessage(message, options = {}) {
    try {
      const aiConfig = store.getters.globalAIKefuConfig
      const params = {
        url: '/api/kefu/chat',
        data: {
          user_id: store.state.memberInfo?.id || 'anonymous',
          stream: false,
          inputs: {},
          query: message,
          response_mode: options.stream ? 'streaming' : 'blocking',
          user: store.state.memberInfo?.id || 'anonymous'
        },
        header: {
          'Content-Type': 'application/json'
        }
      }
      console.log('Sending request to:', params.url);
      console.log('Request data:', params.data);

      const response = await http.sendRequest({
        ...params,
        async: false
      })
      return this.handleResponse(response, options)
    } catch (error) {
      console.error('Dify API请求失败:', error)
      throw new Error('AI服务暂时不可用，请稍后重试')
    }
  },
  
  /**
   * 流式消息处理
   */
  async sendStreamMessage(message, onChunk, onComplete) {
    try {
      return this.sendHttpStream(message, onChunk, onComplete)
    } catch (error) {
      console.error('流式消息发送失败:', error)
      throw error
    }
  },

  /**
   * EventSource 流式聊天
   */
  chatWithEventSource(message, conversationId = '', onMessage, onComplete, onError) {
    if (window.currentEventSource) {
      window.currentEventSource.close();
    }
    const params = new URLSearchParams({
      uniacid: store.state.uniacid || '1',
      user_id: store.state.memberInfo?.id || '123456',
      query: message,
      conversation_id: conversationId || '',
      stream: 'true'
    });
    const url = `/api/kefu/chat?${params.toString()}`;
    try {
      const eventSource = new EventSource(url);
      window.currentEventSource = eventSource;
      let aiMessage = '';
      eventSource.addEventListener('message', (event) => {
        try {
          const data = JSON.parse(event.data);
          if (data.event === 'message') {
            aiMessage += data.answer || '';
            if (onMessage) onMessage(data.answer || '');
          }
          if (data.event === 'message_end') {
            if (onComplete) onComplete({ 
              conversation_id: data.conversation_id,
              message: aiMessage 
            });
          }
          if (data.conversation_id) {
            conversationId = data.conversation_id;
          }
        } catch (error) {
          console.error('解析消息失败:', error);
        }
      });
      eventSource.addEventListener('done', (event) => {
        try {
          const data = JSON.parse(event.data);
          if (onComplete) onComplete(data);
        } catch (error) {
          console.error('解析完成事件失败:', error);
        }
      });
      eventSource.addEventListener('close', (event) => {
        try {
          const data = JSON.parse(event.data);
          console.log('连接正常结束:', data);
        } catch (error) {
          console.error('解析关闭事件失败:', error);
        }
        window.currentEventSource = null;
      });
      eventSource.addEventListener('error', (error) => {
        console.error('EventSource错误:', error);
        if (onError) onError({ error: 'EventSource连接错误' });
        window.currentEventSource = null;
      });
      return eventSource;
    } catch (error) {
      console.error('创建EventSource失败:', error);
      if (onError) onError({ error: error.message });
      return null;
    }
  },

  /**
   * Fetch API 流式聊天
   */
  async chatWithFetchStream(message, conversationId = '', onMessage, onComplete, onError) {
    try {
      let requestData;
      let headers = {
        'Accept': 'text/event-stream'
      };
      requestData = {
        uniacid: store.state.uniacid || '1',
        user_id: store.state.memberInfo?.id || '123456',
        query: message,
        conversation_id: conversationId || '',
        stream: true,
        inputs: {},
        response_mode: 'streaming',
        user: store.state.memberInfo?.id || '123456'
      };
      headers['Content-Type'] = 'application/json';
      const response = await fetch('/api/kefu/chat', {
        method: 'POST',
        headers: headers,
        body: JSON.stringify(requestData)
      });
      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
      }
      if (!response.body) {
        throw new Error('响应体不可用');
      }
      const reader = response.body.getReader();
      const decoder = new TextDecoder('utf-8');
      let buffer = '';
      let aiMessage = '';
      while (true) {
        const { done, value } = await reader.read();
        if (done) break;
        buffer += decoder.decode(value, { stream: true });
        let lineEnd;
        while ((lineEnd = buffer.indexOf('\n')) !== -1) {
          const line = buffer.substring(0, lineEnd);
          buffer = buffer.substring(lineEnd + 1);
          if (line.startsWith('data: ')) {
            try {
              const data = JSON.parse(line.substring(6));
              if (data.event === 'message' || data.event === 'text_message') {
                const textContent = data.answer || data.text || '';
                aiMessage += textContent;
                if (onMessage) onMessage(textContent);
              } else if (data.event === 'message_end' || data.event === 'done') {
                if (onComplete) onComplete({
                  conversation_id: data.conversation_id,
                  message: aiMessage,
                  ...data
                });
              } else if (data.event === 'error' && onError) {
                onError(data);
              }
              if (data.conversation_id) {
                conversationId = data.conversation_id;
              }
            } catch (e) {
              console.warn('解析流式数据失败:', e);
            }
          }
        }
      }
      if (buffer.startsWith('data: ')) {
        try {
          const data = JSON.parse(buffer.substring(6));
          if ((data.event === 'message' || data.event === 'text_message') && onMessage) {
            const textContent = data.answer || data.text || '';
            onMessage(textContent);
          } else if ((data.event === 'message_end' || data.event === 'done') && onComplete) {
            onComplete({
              conversation_id: data.conversation_id,
              message: aiMessage,
              ...data
            });
          }
        } catch (e) {
          console.warn('解析剩余数据失败:', e);
        }
      }
    } catch (error) {
      console.error('Fetch流式聊天请求失败:', error);
      if (onError) onError({ error: error.message });
    }
  },
    
  /**
   * HTTP流式请求（修复conversationId未定义）
   */
  async sendHttpStream(message, onChunk, onComplete) {    
    const params = {
      url: '/api/kefu/chat',
      data: {
        query: message,
        conversation_id: '',
        user_id: store.state.memberInfo?.id || 'anonymous',
        stream: true,
        uniacid: store.state.uniacid,
        inputs: {},
        response_mode: 'streaming',
        user: store.state.memberInfo?.id || 'anonymous'
      },
      header: {
        'Content-Type': 'application/json'
      }
    }
    // #ifdef H5
    try {
      const url = Config.baseUrl + `/api/kefu/chat`;
      const response = await fetch(url, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Accept': 'text/event-stream',
        },
        body: JSON.stringify({
          uniacid: store.state.uniacid || '1',
          inputs: {},
          query: message,
          response_mode: 'streaming',
          user_id: store.state.memberInfo?.id || 'anonymous'
        })
      })
      const reader = response.body.getReader()
      const decoder = new TextDecoder()
      let content = ''
      let buffer = ''
      // 修复：声明conversationId变量
      let conversationId = ''; 
      
      function processStreamData(buffer, callback) {
        const lines = buffer.split('\n');
        buffer = lines.pop() || '';
        lines.forEach(line => {
          line = line.trim();
          if (!line) return;
          if (line.startsWith('data:')) {
            const dataPart = line.slice(5).trim();
            if (dataPart) {
              try {
                const data = JSON.parse(dataPart);
                if (data.event === 'message') {
                  callback(data.answer || '');
                }
                if (data.conversation_id) {
                  conversationId = data.conversation_id;
                }
                if (data.event === 'message_end') {
                  console.log('对话完成');
                }
              } catch (error) {
                console.error('解析流式数据失败:', error);
              }
            }
          }
        });
        return buffer;
      }
      
      while (true) {
        const { done, value } = await reader.read()
        if (done) break
        buffer += decoder.decode(value, { stream: true });
        buffer = processStreamData(buffer, (newData) => {
          if (newData) {
            content += newData;
            if (onChunk) onChunk(newData);
          }
        });
      }
      if (onComplete) onComplete(content)
      return content
    } catch (error) {
      console.error('HTTP流式请求失败:', error)
      throw error
    }
    // #endif
    // #ifndef H5
    const response = await http.sendRequest({
      ...params,
      async: false
    })
    if (response.success && response.data) {
      const content = response.data
      const chunkSize = 3
      let index = 0
      const streamInterval = setInterval(() => {
        if (index < content.length) {
          const chunk = content.substring(index, index + chunkSize)
          index += chunkSize
          if (onChunk) onChunk(chunk)
        } else {
          clearInterval(streamInterval)
          if (onComplete) onComplete(content)
        }
      }, 100)
    }
    // #endif
  },
  
  /**
   * 处理API响应
   */
  handleResponse(response, options) {
    if (response.code === 0 || response.success) {
      return {
        success: true,
        content: response.data?.answer || response.data?.content || response.data?.reply|| response.data,
        conversationId: response.data?.conversation_id,
        messageId: response.data?.message_id
      }
    } else {
      throw new Error(response.message || 'AI服务返回错误')
    }
  },
  
  /**
   * 生成会话ID
   */
  async generateConversationId() {
    const params = {
      url: '/api/kefu/createConversation',
      data: {
        uniacid: store.state.uniacid,
        user_id: store.state.memberInfo?.id || 'anonymous',
        member_id: store.state.memberInfo?.id || '',
      },
      header: {
        'Content-Type': 'application/json'
      }
    }
    const response = await http.sendRequest({
      ...params,
      async: false
    })
    return this.handleResponse(response)
  },
  
  /**
   * 获取AI服务状态
   */
  async getServiceStatus() {
    try {
      const response = await http.sendRequest({
        url: '/api/kefu/health',
        async: false,
        data: {}
      })
      const available = [response?.data?.status, response?.data?.components?.ai_service_config?.status].filter(item => item === 'healthy').length > 0;
      return {
        available,
        reason: available ? '服务正常' : '服务异常'
      }
    } catch (error) {
      return {
        available: false,
        reason: '服务检查失败'
      }
    }
  },
  
  /**
   * 清除会话历史
   */
  async clearConversation(conversationId) {
    try {
      const response = await http.sendRequest({
        url: '/api/kefu/clear-conversation',
        data: { conversation_id: conversationId },
        async: false
      })
      return response.success
    } catch (error) {
      console.error('清除会话失败:', error)
      return false
    }
  },
  /**
   * 获取会话历史
   */
  async getConversationHistory(params = {}) {
    try {
      if (!params.conversation_id) {
        throw new Error('会话ID（conversation_id）是必填参数');
      }
      const requestData = {
        uniacid: params.uniacid || store.state.uniacid || '1',
        conversation_id: params.conversation_id,
        user_id: params.user_id || store.state.memberInfo?.id || 'anonymous',
        limit: params.limit || 20,
        offset: params.offset || 0,
        member_id: params.member_id || store.state.memberInfo?.id || '',
        token: params.token || ''
      };
      const response = await http.sendRequest({
        url: '/api/kefu/getHistory',
        data: requestData,
        header: {
          'Content-Type': 'application/json'
        },
        async: false
      });
      if (response.code === 0 || response.success) {
        return {
          success: true,
          data: response.data,
          messages: response.data?.messages || [],
          total: response.data?.total || 0,
          page_info: response.data?.page_info || { limit: 20, offset: 0 }
        };
      } else {
        throw new Error(response.message || '获取会话历史失败');
      }
    } catch (error) {
      console.error('获取会话历史失败:', error);
      throw new Error(error.message || '获取会话历史时发生错误，请稍后重试');
    }
  }
}