import express from 'express';
import { BotConfig } from '../types'
import {botDeleted, postAdded, groupLeft} from '../handlers';
import {BotType} from '../types';

const createApp = (handle: Function, conf: BotConfig) => {
  const app = express();
  app.use(express.json())
  app.use(express.urlencoded({ extended: true }))
  const {Bot} = conf.models || {}
  app.all('/oauth', async (req, res, next) => {
    try {
      const bot = (await (Bot as any).init({
        code: req.query.code,
        token: req.body,
        creator_extension_id: req.query.creator_extension_id,
        creator_account_id: req.query.creator_account_id,
      })) as BotType;
      await bot.setupWebHook(); // this might take a while, depends on when the bot user is ready
      await handle({type: 'BotAdded', bot});
      res.status(200);
      res.send('ok'); // return string to fix issue for serverless-offline
    } catch (e) {
      next(e);
    }
  });

  app.post('/webhook', async (req, res, next) => {
    const message = req.body;
    if (process.env.LOG_LEVEL === 'DEBUG') {
      console.log('WebHook payload:', JSON.stringify(message, null, 2));
    }
    try {
      const body = message.body;
      if (body) {
        switch (body.eventType) {
          case 'Delete': {
            const deleteBot = await botDeleted(Bot, message);
            await handle({type: 'BotRemoved', bot: deleteBot});
            break;
          }
          case 'PostAdded': {
            const result = await postAdded(Bot, message, conf);
            if (result) {
              await handle({type: 'Message4Bot', ...result});
            }
            break;
          }
          case 'GroupLeft':
            const info = await groupLeft(message);
            await handle({
              type: 'BotGroupLeft',
              ...info
            });
            break;
          case 'GroupJoined': {
            const botId = message.ownerId;
            const joinGroupBot = await Bot.findByPk(botId);
            const groupId = message.body.id;
            const groupType = message.body.type;
            await handle({
              type: 'BotJoinGroup',
              bot: joinGroupBot,
              group: {id: groupId, type: groupType },
            });
            break;
          }
          default:
            break;
        }
        await handle({type: body.eventType, message});
      }
      res.header('Validation-Token', req.header('Validation-Token'));
      res.json({ result: 'ok' });
    } catch (e) {
      next(e);
    }
  });

  return app;
};

export default createApp;