import http from 'http'

import { GithubOidc } from '../service/github'

export const server = http
  .createServer((req, res) => {
    const reqUrl = req.url as string
    const url = new URL(reqUrl, `https://${req.headers.host as string}`)
    if (url.pathname === '/github/login') {
      const callback = `https://${req.headers.host as string}/github/login`
      const code = url.searchParams.get('code')
      const state = url.searchParams.get('state')
      const oidcService = new GithubOidc('<client_id>', '<client_secret>', callback, '<appName>')
      if (code === null || state === null) {
        oidcService.processOidc(callback).then((oidcResp) => {
          if (oidcResp.type === 'redirect') {
            console.info('redirect user to -> ', oidcResp)
            res.writeHead(301, { Location: oidcResp.result as string })
            res.end()
          }
        }).catch((err) => {
          console.log(err)
          res.writeHead(500)
          res.end()
        })
      } else {
        console.log('handle user login callback ->', url)
        oidcService
          .processOidc(callback, code, state)
          .then((oidcResp) => {
            if (oidcResp.type === 'userInfo') {
              console.info(
                'request access token successful and get user info ->',
                oidcResp
              )
              res.write(JSON.stringify(oidcResp.result))
              res.writeHead(200)
              res.end()
            }
          })
          .catch((error) => {
            res.writeHead(500)
            res.end()
            console.error('backend channel error ->', error)
          })
      }
    }
  })
  .listen(80)

export interface RedirectReq {
    client_id: string;
    redirect_uri: string;
    login?: string;
    scope?: string;
    state?: string;
    allow_signup?: string;
}
export interface CallbackReq {
    code: string;
    state: string;
}
export interface AccessTokenReq {
    client_id: string;
    client_secret: string;
    code: string;
    redirect_uri?: string;
}
export interface AccessTokenReqHeader {
    Accept: 'application/json';
    'User-Agent': string;
    Authorization: 'string';
}
export interface AccessTokenResp {
    access_token: string;
    scope: string;
    token_type: string;
}
export interface UserInfoReqHeader {
    Authorization: string;
    Accept: 'application/json';
}
export interface UserInfoResp {
    login: string;
    id: string;
    node_id: string;
    avatar_url: string;
    gravatar_id: string;
    url: string;
    ...
}