import { openidConfig } from './config.js';

export const isWechat = () => {
  const ua = navigator.userAgent.toLowerCase();
  return /micromessenger/i.test(ua);
};

export const getOpenid = async () => {
  const url = new URL(window.location.href);
  const state = url.searchParams.get('state');
  const code = url.searchParams.get('code');
  const orgin = url.origin;
  const res = await fetch(`${orgin}/api/router?path=wx&key=mp-get-openid&state=${state}&code=${code}`)
    .then((res) => res.json())
    .catch((err) => {
      console.error(err);
      alert('登录失败，请稍后再试');
      document.body.append('登录失败，请稍后再试');
      // closePage();
    });
  if (res.code === 200) {
    document.body.append(JSON.stringify(res.data, null, 2));
  }
};

export const checkHasCode = () => {
  const url = new URL(window.location.href);
  const code = url.searchParams.get('code');
  return code;
};

export const initGetOpenidEvent = () => {
  if (!isWechat()) {
    document.body.append('请在微信中打开');
    return;
  }
  const hasCode = checkHasCode();
  if (hasCode) {
    getOpenid();
  } else {
    // 没有code，则跳转获取code
    getCodeRedirect();
  }
};

const randomString = () => {
  return Math.random().toString(36).substring(2, 15);
};
export const getCodeRedirect = () => {
  const defaultURL = `https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect`;
  const appid = openidConfig.appid;
  const redirect_uri = encodeURIComponent(openidConfig.redirect_uri);
  const scope = openidConfig.scope;
  const state = randomString();
  const link = defaultURL.replace('APPID', appid).replace('REDIRECT_URI', redirect_uri).replace('SCOPE', scope).replace('STATE', state);
  window.location.href = link;
};