import { useCallback, useEffect, useRef } from 'react';
import { useTranslation } from 'react-i18next';
import { getWebSocketManager, WsMessage, getWebSocketErrorMessage } from '@/lib/websocket-util';
import { Message, Assistant } from '@/types/ask';
import { Dispatch, SetStateAction } from 'react';

interface UseWebSocketStreamHandlerOptions {
  setUserMessages: Dispatch<SetStateAction<Message[]>>;
  isMounted: boolean;
  enableBatching?: boolean; // 是否启用批量处理
  renderInterval?: number; // 渲染间隔，默认50ms
}

export const useWebSocketStreamHandler = ({
  setUserMessages,
  isMounted,
  enableBatching = false,
  renderInterval = 50
}: UseWebSocketStreamHandlerOptions) => {
  const { t } = useTranslation();
  const isMountedRef = useRef(isMounted);
  
  // 批量处理相关的refs
  const chunkQueue = useRef<string[]>([]);
  const renderIntervalRef = useRef<ReturnType<typeof setInterval> | null>(null);
  
  // 更新挂载状态
  useEffect(() => {
    isMountedRef.current = isMounted;
  }, [isMounted]);

  // 清理函数
  const cleanup = useCallback(() => {
    if (renderIntervalRef.current) {
      clearInterval(renderIntervalRef.current);
      renderIntervalRef.current = null;
    }
    chunkQueue.current = [];
  }, []);

  // 批量处理流式消息的函数
  const processBatchedChunks = useCallback(() => {
    if (!isMountedRef.current) {
      cleanup();
      return;
    }
    
    if (chunkQueue.current.length > 0) {
      const textToRender = chunkQueue.current.join('');
      chunkQueue.current = [];

      setUserMessages(prevMessages => {
        try {
          if (prevMessages.length === 0) return prevMessages;

          const lastMessage = prevMessages[prevMessages.length - 1];
          if (lastMessage.role !== Assistant) return prevMessages;

          const updatedContent = (lastMessage.content === 'keepSearchIng' ? '' : lastMessage.content as string) + textToRender;
          const updatedLastMessage = { ...lastMessage, content: updatedContent };

          return [...prevMessages.slice(0, -1), updatedLastMessage];
        } catch (error) {
          console.error('处理批量流式消息时出错:', error);
          return prevMessages;
        }
      });
    } else {
      cleanup();
    }
  }, [setUserMessages, cleanup]);

  const handleChatStream = useCallback((message: WsMessage) => {
    if (!isMountedRef.current || message.type !== 'ChatStream' || !message.chunk) return;

    if (enableBatching) {
      // 批量处理模式
      chunkQueue.current.push(message.chunk);

      if (!renderIntervalRef.current) {
        renderIntervalRef.current = setInterval(processBatchedChunks, renderInterval);
      }
    } else {
      // 实时处理模式（原有逻辑）
      setUserMessages(prevMessages => {
        try {
          const lastMessage = prevMessages[prevMessages.length - 1];

          if (!lastMessage || lastMessage.role !== Assistant) {
            return prevMessages;
          }

          const newMessages = [...prevMessages];

          if (typeof lastMessage.content === 'string') {
            if (lastMessage.content === 'keepSearchIng') {
              newMessages[newMessages.length - 1] = {
                ...lastMessage,
                content: message.chunk
              };
            } else {
              newMessages[newMessages.length - 1] = {
                ...lastMessage,
                content: lastMessage.content + message.chunk
              };
            }
          } else if (Array.isArray(lastMessage.content)) {
            const textPartIndex = lastMessage.content.findIndex(p => p.type === 'text');
            if (textPartIndex !== -1) {
              const updatedContent = [...lastMessage.content];
              updatedContent[textPartIndex] = {
                ...updatedContent[textPartIndex],
                text: (updatedContent[textPartIndex].text || '') + message.chunk
              };

              newMessages[newMessages.length - 1] = {
                ...lastMessage,
                content: updatedContent
              };
            }
          }

          return newMessages;
        } catch (error) {
          console.error('处理 ChatStream 消息时出错:', error);
          return prevMessages;
        }
      });
    }
  }, [setUserMessages, enableBatching, processBatchedChunks, renderInterval]);

  const handleChatStreamEnd = useCallback((message: WsMessage) => {
    if (!isMountedRef.current || message.type !== 'ChatStreamEnd') return;

    // 如果是批量模式，先处理剩余的chunks
    if (enableBatching) {
      cleanup();
      
      const remainingText = chunkQueue.current.join('');
      chunkQueue.current = [];

      setUserMessages(prevMessages => {
        try {
          if (prevMessages.length === 0) return prevMessages;

          const lastMessage = prevMessages[prevMessages.length - 1];
          if (lastMessage.role !== Assistant) return prevMessages;

          const contentWithQueue = (lastMessage.content === 'keepSearchIng' ? '' : lastMessage.content as string) + remainingText;

          const updatedLastMessage = {
            ...lastMessage,
            content: message.message ? message.message.content : contentWithQueue,
            timestamp: message.message ? message.message.timestamp : lastMessage.timestamp,
          };

          return [...prevMessages.slice(0, -1), updatedLastMessage];
        } catch (error) {
          console.error('处理ChatStreamEnd消息时出错:', error);
          return prevMessages;
        }
      });
    } else {
      // 实时模式的处理逻辑
      setUserMessages(prevMessages => {
        try {
          const lastMessage = prevMessages[prevMessages.length - 1];

          if (!lastMessage || lastMessage.role !== Assistant) {
            return prevMessages;
          }

          if (message.message) {
            const newMessages = [...prevMessages];
            newMessages[newMessages.length - 1] = message.message as Message;
            return newMessages;
          } else {
            return prevMessages.filter(m =>
              !(typeof m.content === 'string' && m.content === 'keepSearchIng')
            );
          }
        } catch (error) {
          console.error('处理 ChatStreamEnd 消息时出错:', error);
          return prevMessages;
        }
      });
    }
  }, [setUserMessages, enableBatching, cleanup]);

  const handleChatResponse = useCallback((message: WsMessage) => {
    if (!isMountedRef.current || message.type !== 'ChatResponse') return;

    if (message.message) {
      setUserMessages(prevMessages => {
        try {
          const updatedMessages = [...prevMessages];
          updatedMessages[updatedMessages.length - 1] = message.message as Message;
          return updatedMessages;
        } catch (error) {
          console.error('处理聊天响应时出错:', error);
          return prevMessages;
        }
      });
    }
  }, [setUserMessages]);

  const handleError = useCallback((message: WsMessage) => {
    if (!isMountedRef.current || message.type !== 'Error') return;

    console.log(`WebSocket Error: ${message.code} - ${message.message}`);

    setUserMessages(prevMessages => {
      try {
        const lastMessage = prevMessages[prevMessages.length - 1];

        if (!lastMessage ||
          lastMessage.role !== Assistant ||
          typeof lastMessage.content !== 'string' ||
          lastMessage.content !== 'keepSearchIng') {
          return prevMessages;
        }

        const newMessages = [...prevMessages];
        newMessages[newMessages.length - 1] = {
          ...lastMessage,
          content: getWebSocketErrorMessage(message.code, t)
        };

        return newMessages;
      } catch (error) {
        console.error('处理 Error 消息时出错:', error);
        return prevMessages;
      }
    });
  }, [setUserMessages, t]);

  const subscribeToWebSocket = useCallback(() => {
    const webSocketManager = getWebSocketManager();
    webSocketManager.connect();

    webSocketManager.subscribe('ChatStream', handleChatStream);
    webSocketManager.subscribe('ChatStreamEnd', handleChatStreamEnd);
    webSocketManager.subscribe('ChatResponse', handleChatResponse);
    webSocketManager.subscribe('Error', handleError);

    return () => {
      // 清理订阅
      webSocketManager.unsubscribe('ChatStream', handleChatStream);
      webSocketManager.unsubscribe('ChatStreamEnd', handleChatStreamEnd);
      webSocketManager.unsubscribe('ChatResponse', handleChatResponse);
      webSocketManager.unsubscribe('Error', handleError);
      
      // 清理批量处理资源
      cleanup();
    };
  }, [handleChatStream, handleChatStreamEnd, handleChatResponse, handleError, cleanup]);

  // 组件卸载时的清理
  useEffect(() => {
    return () => {
      cleanup();
    };
  }, [cleanup]);

  return {
    subscribeToWebSocket,
    handleChatStream,
    handleChatStreamEnd,
    handleChatResponse,
    handleError,
    cleanup
  };
};