import { Auth } from "./auth"
import { Frontend } from "./frontend"

export class Server {
  async getEnv(variables) {
    return Object.fromEntries(
      await Promise.all(
        variables.map(async variable => {
          const {state} = await Deno.permissions.query({
            name: 'env', variable
          })
          if (state === 'granted') {
            return [variable, Deno.env.get(variable)]
          } else {
            return [variable, undefined]
          }
        })
      )
    )
  }

  async configure() {
    const env = await this.getEnv([
      'PORT',
      'BASE_URL',
      'GITEA_APP_BASE_URL',
      'GITEA_API_BASE_URL',
    ])
    this.port = env.PORT ?? 3000
    this.baseUrl = env.BASE_URL ?? '/macchiato'
    this.giteaAppBaseUrl = (
      env.GITEA_APP_BASE_URL ?? 'http://gitea:3000'
    )
    this.giteaApiBaseUrl = (
      env.GITEA_API_BASE_URL ?? 'http://gitea:3000/api/v1'
    )
  }

  async init() {
    this.auth = new Auth()
    this.frontend = new Frontend({
      appBaseUrl: this.giteaAppBaseUrl,
      apiBaseUrl: this.giteaApiBaseUrl,
    })
    const promises = []
    const repos = [
      'loader',
      'editor',
      'forms',
      'menu',
      'settings',
      'dialog',
      'storage',
      'editor-lib-codemirror',
    ]
    for (const repo of repos) {
      promises.push(server.frontend.loadRepo(
        'macchiato',
        repo,
        {srcPath: [], destPath: [repo]}
      ))
    }
    promises.push(server.frontend.loadRepo(
      'macchiato',
      'pages',
      {srcPath: [], destPath: []}
    ))
    promises.push(server.frontend.loadRepo(
      'macchiato',
      'server',
      {
        srcPath: [],
        destPath: ['server'],
        ref: 'shared-server'
      }
    ))
    await Promise.all(promises)
    this.frontend.files['/app.js'] = (
      this.frontend.files['/server/app.js']
    )
    this.frontend.files['/'] = (
      this.frontend.files['/index.html']
    )
    const sw = this.frontend.files['/sw.js']
    const commit = (
      this.frontend.files['/server/app.js'].commit
    )
    sw.body = (
      new TextEncoder().encode(
        new TextDecoder().decode(sw.body) +
        `\n// ${commit}\n`
      )
    )
  }

  async serveRequest(event) {
    const {pathname} = new URL(event.request.url)
    if (pathname === `${this.baseUrl}/api/auth`) {
      await this.auth.redirect(event)
    } else {
      await this.frontend.serve(event)
    }
  }

  async serveConn(conn) {
    const httpConn = Deno.serveHttp(conn)
    for await (const event of httpConn) {
      this.serveRequest(event)
    }
  }

  async serve() {
    await this.configure()
    await this.init()
    this.server = Deno.listen({
      port: this.port,
    })
    for await (const conn of this.server) {
      this.serveConn(conn)
    }
  }

  async run() {
    await this.configure()
    await this.init()
    await this.serve()
  }
}