'use strict';

const assert = require('assert');
const _ = require('lodash');
const uuid = require('uuid');
const urljoin = require('url-join');
const Controller = require('egg').Controller;

/**
 * 微信认证，获得openid和用户信息，生成微信Jwt
 */
class WeixinController extends Controller {
  /**
   * 认证流程
   * 1. 缓存原始请求地址，生成state和认证回调地址
   * 2. 通过wxapi认证，获得认证code
   * 3. 通过code获得openid，通过openid，查询绑定用户，创建jwt
   * 4. jwt写入redis，返回认证code
   * 5. 通过code获取jwt
   */
  // GET 请求认证
  // response_type:
  //       code - url带上code参数重定向到原始地址
  //       store - 默认，认证结果写入sessionStore，然后重定向回请求页面（要求请求页面和认证服务在同一域名下）
  //       token - url带上token参数重定向到原始地址
  async auth() {
    const { redirect_uri, code, test, type, response_type = 'store', groupid, doctorid } = this.ctx.query;
    if (test) {
      return await this.authTest();
    }
    if (code) {
      return await this.authBack(this.ctx.query);
    }

    this.ctx.logger.debug(`[auth] reditect_uri - ${redirect_uri}`);
    // assert(redirect_uri, '回调地址不能为空');

    // TODO: 保存原始请求地址
    // const { config } = this.app;
    // console.log('ctx.host: ', this.ctx.host);
    // console.log('config.hostHeaders: ', config.hostHeaders);
    // TODO: 保存原始请求地址
    const state = uuid();
    const key = `visit:auth:state:${state}`;
    const val = JSON.stringify({ redirect_uri, type, groupid, doctorid });
    await this.app.redis.set(key, val, 'EX', 600);

    // TODO: 生成回调地址
    const { wxapi, authUrl = this.ctx.path } = this.app.config;
    const backUrl = encodeURI(`${this.app.config.baseUrl}${this.config.authUrl}?state=${state}`);
    const to_uri = `${wxapi.baseUrl}/api/auth?appid=${wxapi.appid}&response_type=code&redirect_uri=${backUrl}&connect_redirect=1#wechat`;
    console.log('url-->' + to_uri);
    this.ctx.redirect(to_uri);
  }

  // GET 认证回调
  async authBack({ code, state }) {
    // const { code, state, type, redirecturi } = this.ctx.query;
    console.log(this.ctx.query);
    this.ctx.logger.debug(`[auth-back] code - ${code}, state - ${state}`);
    assert(code, 'code不能为空');
    assert(state, 'state不能为空');
    console.log('code-->' + code);

    const { weixin } = this.ctx.service;
    let openid;
    try {
      ({ openid } = await weixin.fetch(code));
    } catch (err) {
      await this.ctx.render('error.njk', { title: err.message, message: err.details });
      return;
    }
    console.log('openid--->' + openid);
    if (openid) {
      const key = `visit:auth:state:${state}`;
      const val = await this.app.redis.get(key);
      const { redirect_uri } = JSON.parse(val);
      console.log('redirect_uri-->' + redirect_uri);
      // 通过openid取得用户信息
      const user = await this.ctx.service.user.findByOpenid(openid);
      if (user) {
        const to_uri = urljoin(redirect_uri, `?openid=${openid}&uid=${user.id}&type=${user.type}`);
        // TODO: 重定性页面
        console.log('to_uri222-->' + to_uri);
        this.ctx.redirect(to_uri);
      } else {
        console.log('rrr--->' + redirect_uri);
        const to_uri = urljoin(redirect_uri, `?openid=${openid}`);

        // TODO: 重定性页面
        this.ctx.redirect(to_uri);
      }
    }

  }

  // GET 用户授权内部测试接口
  async authTest() {
    const { redirect_uri, type, groupid, doctorid } = this.ctx.query;
    const openid = '1234567';
    this.ctx.logger.debug(`[auth-test] reditect_uri - ${redirect_uri}, openid - ${openid}`);
    assert(redirect_uri, '回调地址不能为空');
    assert(openid, 'openid不能为空');

    if (type === 'group') {
      const to_uri = urljoin(redirect_uri, `?openid=${openid}&groupid=${groupid}`);
      // TODO: 重定性页面
      console.log('to_uri222-->' + to_uri);
      this.ctx.redirect(to_uri);
    } else if (type === 'login') {
      console.log('to_uri333-->' + redirect_uri);
      const to_uri = urljoin(redirect_uri, `?openid=${openid}`);
      console.log('to_uri333-->' + to_uri);
      // TODO: 重定性页面
      this.ctx.redirect(to_uri);
    } else if (type === 'doctor') {
      const to_uri = urljoin(redirect_uri, `?openid=${openid}&doctorid=${doctorid}`);
      // TODO: 重定性页面
      this.ctx.redirect(to_uri);
    } else {
      console.log('rrr--->' + redirect_uri);
      const to_uri = urljoin(redirect_uri, `?openid=${openid}`);

      // TODO: 重定性页面
      this.ctx.redirect(to_uri);
    }
  }
}

module.exports = WeixinController;