'use client';
import { Channel, StreamChat } from 'stream-chat';
import { create } from 'zustand';
import { getUserToken, createChannel } from '@/services/editor';
import { parseSSEStream, parseData } from '@/utils/streamParser';

type Message = {
  key: string;
  role: string;
  content: string;
};

interface StreamChatStore {
  client: StreamChat | null;
  user: {
    userId: string;
    userName: string;
  };
  // 连接 StreamChat 客户端
  connect: (user: any) => Promise<void>;
  // 频道
  channels: Channel[];
  currentChannel: Channel | null;
  // 创建某个角色的聊天频道, 返回channelId
  createChannel: (characterId: string) => Promise<string | false>;
  switchToChannel: (id: string) => Promise<void>;
  queryChannels: (filter: any) => Promise<void>;
  deleteChannel: (id: string) => Promise<void>;
  clearChannels: () => Promise<void>;
  getCurrentCharacter: () => any | null;

  // 消息列表
  messages: Message[];
  setMessages: (messages: Message[]) => void;

  // 发送消息
  sendMessage: (content: string) => Promise<void>;

  // 清除通知
  clearNotifications: () => Promise<void>;
}
export const useStreamChatStore = create<StreamChatStore>((set, get) => ({
  client: null,
  user: {
    userId: '',
    userName: '',
  },
  channels: [],
  messages: [],
  setMessages: (messages: any[]) => set({ messages }),
  currentChannel: null,
  // 获取当前聊天频道中的角色id
  getCurrentCharacter() {
    const { currentChannel, user } = get();
    return (
      Object.values(currentChannel?.state?.members || {})?.find((i) => i.user?.id !== user?.userId)
        ?.user?.id || null
    );
  },
  // 创建某个角色的聊天频道
  async createChannel(characterId: string) {
    const { user, client } = get();
    const { switchToChannel, queryChannels } = get();
    if (!client) {
      return false;
    }
    const { data } = await createChannel({
      userId: user.userId,
      userName: user.userName,
      characterId,
    });
    if (!data?.channelId) {
      return false;
    }
    await queryChannels({});
    switchToChannel(data.channelId);
    return data.channelId;
  },

  async connect(user) {
    const { client } = get();
    set({ user });
    if (client) return;
    const { data } = await getUserToken(user);
    const streamClient = new StreamChat(process.env.NEXT_PUBLIC_STREAM_CHAT_API_KEY || '');
    const res = await streamClient.connectUser(
      {
        id: user.userId,
        name: user.userName,
      },
      data
    );
    set({ client: streamClient });
  },

  async switchToChannel(id: string) {
    const { client, user } = get();
    const channel = client!.channel('messaging', id);
    const result = await channel.query({
      messages: { limit: 100 },
    });
    const messages = result.messages.map((i) => ({
      key: i.id,
      role: i.user?.id === user.userId ? 'user' : 'assistant',
      content: i.text!,
    }));
    set({ currentChannel: channel, messages });
  },

  async queryChannels() {
    const { user, client } = get();
    if (!client) {
      console.error('StreamChat client is not connected');
      return;
    }
    try {
      const channels = await client.queryChannels(
        {
          members: {
            $in: [user.userId],
          },
        },
        {
          last_message_at: -1,
        },
        {
          message_limit: 1, // 返回最新的1条消息
        }
      );
      set({ channels });
    } catch (error) {
      console.error('Failed to query channels:', error);
    }
  },

  async deleteChannel(id: string) {
    const { channels, currentChannel, queryChannels } = get();
    const channel = channels.find((ch) => ch.id === id);
    if (!channel) {
      console.warn(`Channel with id ${id} not found`);
      return;
    }
    try {
      await channel.delete();
      await queryChannels({});
      if (currentChannel?.id === id) {
        set({ currentChannel: null });
      }
    } catch (error) {
      console.error(`Failed to delete channel ${id}:`, error);
    }
  },

  async clearChannels() {
    const { channels } = get();

    try {
      // 停止监听所有频道
      for (const channel of channels) {
        try {
          await channel.stopWatching();
        } catch (error) {
          console.warn(`Failed to stop watching channel ${channel.id}:`, error);
        }
      }

      // 清空频道列表和当前频道
      set({
        channels: [],
        currentChannel: null,
      });
    } catch (error) {
      console.error('Failed to clear channels:', error);
    }
  },
  async clearNotifications() {},

  // 发送消息
  sendMessage: async (content: any) => {
    const { user, currentChannel, getCurrentCharacter, setMessages, messages } = get();
    // 过滤出用户和助手的消息
    const filteredMessages = messages.filter((i) => i.role === 'user' || i.role === 'assistant');
    let finalMessages = [
      ...filteredMessages,
      { key: user.userId, role: 'user', content: content },
      { key: 'assistant', role: 'assistant', content: '' },
    ];
    setMessages(finalMessages);

    // 发送消息到服务器
    const response = await fetch(
      `${process.env.NEXT_PUBLIC_CHAT_API_URL}/chat-api/chat/testPrompt`,
      {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          userId: user.userId,
          channelId: currentChannel?.id || '',
          message: content,
          promptTemplateId: 'default',
          characterId: getCurrentCharacter()?.id,
          modelName: 'gpt-3.5-turbo',
        }),
      }
    );

    // 处理服务器返回的 SSE 流
    await parseSSEStream(response, (event: string, data: string) => {
      if (event === 'chat-message') {
        const d = parseData(data);
        const lastMsg = finalMessages[finalMessages.length - 1];
        if (lastMsg.role === 'assistant') {
          lastMsg.content = d.content || '';
        }
        setMessages([...finalMessages]);
      }
    });
  },
}));