import { Dispatch, MutableRefObject, SetStateAction, useCallback, useEffect, useId, useRef, useState } from 'react';
import useSWR, { KeyedMutator } from 'swr';

export interface FunctionCall {
  /**
   * The arguments to call the function with, as generated by the model in JSON
   * format. Note that the model does not always generate valid JSON, and may
   * hallucinate parameters not defined by your function schema. Validate the
   * arguments in your code before calling your function.
   */
  arguments?: string;

  /**
   * The name of the function to call.
   */
  name?: string;
}

/**
 * The tool calls generated by the model, such as function calls.
 */
export interface ToolCall {
  // The ID of the tool call.
  id: string;

  // The type of the tool. Currently, only `function` is supported.
  type: string;

  // The function that the model called.
  function: {
    // The name of the function.
    name: string;

    // The arguments to call the function with, as generated by the model in JSON
    arguments: string;
  };
}

export type JSONValue =
  | null
  | string
  | number
  | boolean
  | { [x: string]: JSONValue }
  | Array<JSONValue>;

/**
 * Shared types between the API and UI packages.
 */
export interface Message {
  id?: string;
  tool_call_id?: string;
  createdAt?: Date;
  content: string;
  ui?: string | JSX.Element | JSX.Element[] | null | undefined;
  // role: 'system' | 'user' | 'assistant' | 'function' | 'data' | 'tool';
  /**
   * If the message has a role of `function`, the `name` field is the name of the function.
   * Otherwise, the name field should not be set.
   */
  name?: string;
  /**
   * If the assistant role makes a function call, the `function_call` field
   * contains the function call name and arguments. Otherwise, the field should
   * not be set. (Deprecated and replaced by tool_calls.)
   */
  function_call?: string | FunctionCall;

  data?: JSONValue;
  /**
   * If the assistant role makes a tool call, the `tool_calls` field contains
   * the tool call name and arguments. Otherwise, the field should not be set.
   */
  tool_calls?: string | ToolCall[];

  /**
   * Additional message-specific information added on the server via StreamData
   */
  annotations?: JSONValue[] | undefined;
}

interface Error {
  name: string;
  message: string;
  stack?: string;
}

interface WebSocketMessage {
  messageId?: string;
  conversationId?: string;
  type: string;
  content: string;
  streamStatus: "start" | "end" | "middle";
}

// type WebSocketData = WebSocketMessage;

interface WebSocketOptions {
  id?: string;
  initialMessages?: WebSocketMessage[];
  initialInput?: string;
  onResponse?: (response: Response) => void | Promise<void>;
  onFinish?: (message: WebSocketMessage[] | string[]) => void;
  onError?: (error: Error | any) => void;
}



export type WebSocketHook = {
  messages: WebSocketMessage[];
  isLoading: boolean;
  input: string;

  error: undefined | Error;

  setMessages: (messages: WebSocketMessage[]) => void;

  setInput: React.Dispatch<React.SetStateAction<string>>;
  // sendMessage: (message: string) => void;
  // append: (message: string) => void;
  append: (
    message: Message,
    // chatRequestOptions?: ChatRequestOptions,
  ) => Promise<string | null | undefined | void>;
}



const getStreamedResponse = async (
  event: MessageEvent,
  setMessages: (messages: WebSocketMessage[]) => void,
  mutate: KeyedMutator<WebSocketMessage[]>,
  messagesRef: MutableRefObject<WebSocketMessage[]>,
  mutateLoading: KeyedMutator<boolean>,
  setInput: Dispatch<SetStateAction<string>>
) => {
  const receivedMessage = event.data;
  let parsedMessage = receivedMessage;

  try {
    parsedMessage = JSON.parse(receivedMessage);
  } catch (error) {
    // console.error("解析接收到的消息时出错:", error);
  }

  let messageBuffer: WebSocketMessage = {
    messageId: '',
    conversationId: '',
    type: '',
    content: "",
    streamStatus: 'middle'
  };

  switch (parsedMessage.streamStatus) {
    case "start":
      mutateLoading(true);
      console.log("开始接收信息", parsedMessage);

      messageBuffer.type = parsedMessage.type

      // setMessages([...messagesRef.current, messageBuffer])
      messagesRef.current = [...messagesRef.current, messageBuffer]
      break;
    case "end":
      console.log("结束接收信息", parsedMessage);


      setInput("")
      mutateLoading(false);
      break;
    default:


      const lastMessage = messagesRef.current[messagesRef.current.length - 1];
      console.log("中间接收信息进行消息输出拼接", parsedMessage, lastMessage);

      lastMessage.content = lastMessage.content + parsedMessage
      // setMessages([...messagesRef.current.slice(0, -1), lastMessage])



      // // 更新最后一条消息的内容
      // const lastMessageIndex = messagesRef.current.length - 1;
      // const lastMessage = messagesRef.current[lastMessageIndex];
      // lastMessage.content += parsedMessage;

      // 更新 messagesRef.current，并触发 UI 重新渲染
      messagesRef.current = [
        ...messagesRef.current.slice(0, -1),
        lastMessage
      ];



      break;
  }

};

const useISDK_B = (url: string, options: WebSocketOptions): WebSocketHook => {

  const websocketOptions = {
    headers: {
      'Sec-WebSocket-Version': '13',
      // 添加其他自定义请求头
      'Custom-Header': 'value',
    }
  };

  const socketRef = useRef<WebSocket | null>()


  const { onResponse, onFinish, onError } = options || {};
  const [input, setInput] = useState<string>(options?.initialInput || '');


  const [initialMessagesFallback] = useState([]);

  // let messages = options?.initialMessages ?? initialMessagesFallback

  const hookId = useId();
  const idKey = options?.id ?? hookId;
  const chatKey = typeof url === 'string' ? [url, idKey] : idKey;

  const { data: messages, mutate } = useSWR<WebSocketMessage[]>(
    [chatKey, 'messages'],
    null,
    { fallbackData: (options?.initialMessages ?? initialMessagesFallback) || [] },
  );

  const { data: isLoading = false, mutate: mutateLoading } = useSWR<boolean>(
    [chatKey, 'loading'],
    null,
  );

  const { data: error = undefined, mutate: setError } = useSWR<
    undefined | Error
  >([chatKey, 'error'], null);

  // Keep the latest messages in a ref.
  const messagesRef = useRef<WebSocketMessage[]>(messages || []);

  useEffect(() => {
    // messagesRef.current = messages || [];
    mutate(messagesRef.current)
  }, [messagesRef]);

  const setMessages = useCallback(
    (newMessages: WebSocketMessage[]) => {

      // messagesRef.current = newMessages || [];
      mutate(newMessages, false);

      console.log("--setMessages---", messagesRef.current);
    },
    [mutate]
  );

  const setupWebSocket = useCallback((newURL: string) => {
    // if (socketRef.current) {
    //   socketRef.current.close(); // 关闭旧连接
    // }

    // const webSocket = new WebSocket(newURL)
    const socket = new WebSocket(newURL, []);

    if (socketRef.current) return;
    // setWs(socket);

    socket.onopen = () => {
      console.log('WebSocket 连接已建立');
      if (options?.initialInput !== undefined) {
        // console.log("---useWebSocket------", options)
        // ws.send(options.initialInput as string); // 将 undefined 转换为 string
        setInput("")
        append({
          id: '',
          content: options.initialInput,
        })
      }
    };

    socket.onclose = () => {
      console.log('WebSocket 连接已关闭');
      // if (onFinish && !!messages) {
      //   onFinish(messages);
      // }
      if (socketRef?.current) {
        socketRef.current.close()
        setupWebSocket(newURL)
      }
    };


    socket.onerror = (error) => {
      console.error('WebSocket 连接发生错误:', error);
      if (onError) {
        onError(error);
      }
      mutateLoading(false);// 发生错误后，设置 isLoading 为 false
    };

    socketRef.current = socket

  }, [
    socketRef.current,
    // input, 
    mutate,
    messagesRef,
    onError,
  ],
  )

  useEffect(() => {

    const socket = socketRef.current


    if (url && socket && socket?.url !== url) {
      socket.close()
      setupWebSocket(url)
    } else if (url && !socket) {
      setupWebSocket(url)
    }
  }, [socketRef.current, onResponse, onFinish, onError])


  // 发送消息
  const triggerRequest = useCallback(async (chatRequest: Message) => {
    console.log("-----triggerRequest--------", chatRequest)


    try {
      if (socketRef?.current && socketRef?.current.readyState === WebSocket.OPEN) {
        mutateLoading(true); // 发送消息时，设置 isLoading 为 true
        socketRef.current.send(chatRequest.content);
      } else {
        console.error('WebSocket 连接未建立或已关闭');
      }
    } catch (error) {

    } finally {
      mutateLoading(false);
    }

  }, [
    socketRef.current,
    messagesRef,

    // input, 
    mutate,
    mutateLoading,
    onResponse,
    onFinish,
    onError,
  ]);


  // 追加消息并发送
  const append = useCallback(
    async (
      message: Message,

    ) => {

      let chatRequest = message

      // setMessages([...messagesRef.current, {
      //   // messageId: message.id,
      //   conversationId: '',
      //   type: 'text',
      //   content: message.content,
      //   streamStatus: 'middle'
      // }])

      messagesRef.current = [...messagesRef.current, {
        // messageId: message.id,
        conversationId: '',
        type: 'text',
        content: message.content,
        streamStatus: 'middle'
      }]

      return triggerRequest(chatRequest);
    },
    [triggerRequest],
  );


  // 在依赖项数组中使用函数的正确方式
  useEffect(() => {


    if (socketRef.current) {
      // socketRef.current.onmessage = handleWebSocketMessage;
      socketRef.current.onmessage = (event) => getStreamedResponse(
        event,
        setMessages,
        mutate,
        messagesRef,
        mutateLoading,
        setInput,
      );
    }


    return () => {
      if (socketRef.current) {
        socketRef.current.onmessage = null; // 清除事件处理程序以防止内存泄漏
      }
    };
  }, [
    socketRef.current,
    mutate,
    mutateLoading,
    messagesRef,

    onResponse,
    onFinish,
    onError,
  ]);


  return {
    messages: messagesRef.current || [],
    isLoading,
    error,
    append,

    setMessages,

    input,
    setInput,

  };
};

export default useISDK_B;