import { WSSManager } from './wss.ts';
import { App, Route } from '@kevisual/router'
import { WebSocketReq, ListenProcessParams } from '@kevisual/router'
import { EventEmitter } from 'eventemitter3';
import { customAlphabet } from 'nanoid';
const letter = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
const customId = customAlphabet(letter, 16);
/**
 * 实时注册的代码模块
 * 
 * 别人通过 WebSocket 连接到此模块，发送路由列表和请求数据
 */
export class LiveCode {
  wssManager: WSSManager;
  app: App;
  emitter: EventEmitter;
  constructor(app: App) {
    this.wssManager = new WSSManager({ heartbeatInterval: 6 * 5000 });
    this.app = app;
    this.emitter = new EventEmitter();
    console.log('[LiveCode] 模块已初始化');
  }
  async conn(req: WebSocketReq) {
    const { ws, emitter, id } = req;
    const that = this;
    // @ts-ignore
    let wid = ws.data?.wid;
    if (!wid) {
      const _id = this.wssManager.addConnection(req, { userId: id });
      // @ts-ignore
      ws.data.wid = _id;
      emitter.once('close--' + id, () => {
        that.wssManager.closeConnection(_id);
        this.deinitAppRoutes(_id);
      });
      console.log('[LiveCode]新的 WebSocket 连接已打开', _id);
      const res = await that.init(_id);
      if (res.code === 200) {
        console.log('[LiveCode]初始化路由列表完成');
        that.initAppRoutes(res.data?.list || [], _id);
      } else {
        console.error('[LiveCode]初始化路由列表失败:', res?.message);
      }
      return this;
    }
    that.onMessage(req);
    return this;
  }
  getWss(id: string) {
    return this.wssManager.getConnection(id)
  }
  async init(id: string): Promise<{ code: number, message?: string, data?: any }> {
    return this.sendData({ message: { path: 'router', key: 'list', } }, id);
  }
  sendData(data: ListenProcessParams, id: string): Promise<{ code: number, message?: string, data?: any }> {
    const reqId = customId()
    const wss = this.getWss(id);
    if (!wss) {
      return Promise.resolve({ code: 500, message: '连接不存在或已关闭' });
    }
    const emitter = this.emitter;
    const wsReq = wss.wsReq;
    try {
      wsReq.ws.send(JSON.stringify({
        type: 'router',
        id: reqId,
        data: data
      }));
    } catch (error) {
      console.error('[LiveCode]发送数据失败:', error);
      return Promise.resolve({ code: 500, message: '发送数据失败' });
    }
    return new Promise((resolve) => {
      const timeout = setTimeout(() => {
        resolve({ code: 500, message: '请求超时' });
        emitter.off(reqId, listenOnce);
      }, 5000);
      const listenOnce = (resData: any) => {
        clearTimeout(timeout);
        resolve(resData);
        emitter.off(reqId, listenOnce);
      }
      emitter.once(reqId, listenOnce);
    });
  }
  onMessage(req: WebSocketReq) {
    const { data } = req;
    if (data?.id) {
      // console.log('LiveCode 收到消息:', data);
      this.emitter.emit(data.id, data.data);
    } else {
      console.warn('[LiveCode] 未知的消息格式', data);
    }
  }
  initAppRoutes(list: Route[], wid: string) {
    for (const route of list) {
      const path = route.path || '';
      const id = route.id || '';
      if (path.startsWith('router') || path.startsWith('auth') || path.startsWith('admin-autu') || path.startsWith('call')) {
        continue;
      }
      // console.log('注册路由:', route.path, route.description, route.metadata, route.id);
      this.app.route({
        path: route.id,
        key: route.key,
        description: route.description,
        metadata: {
          ...route.metadata,
          source: 'livecode',
          liveCodeId: wid
        },
        middleware: ['auth'],
      }).define(async (ctx) => {
        const { token, cookie, ...rest } = ctx.query;
        const tokenUser = ctx.state.tokernUser;
        const res = await this.sendData({
          message: {
            id: route.id,
            payload: rest,
          },
          context: {
            state: {
              tokenUser
            }
          }
        }, wid);
        // console.log('路由响应数据:', res);
        ctx.forward(res)
      }).addTo(this.app, {
        // override: false,
        // // @ts-ignore
        // overwrite: false
      });
    }
  }
  deinitAppRoutes(wid: string) {
    const routesToRemove = this.app.routes.filter(route => route.metadata?.liveCodeId === wid);
    for (const route of routesToRemove) {
      this.app.removeById(route.id);
    }
  }
}