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

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',
      'REMOTE_BASE_URL',
      'GITEA_APP_BASE_URL',
      'GITEA_API_BASE_URL',
      'GITEA_WEB_BASE_URL',
      'GITEA_CLIENT_ID',
      'GITEA_CLIENT_SECRET',
    ])
    this.port = env.PORT ?? 3000
    this.baseUrl = env.BASE_URL ?? '/macchiato'
    this.remoteBaseUrl = env.REMOTE_BASE_URL
    this.giteaAppBaseUrl = (
      env.GITEA_APP_BASE_URL ?? 'http://gitea:3000'
    )
    this.giteaApiBaseUrl = (
      env.GITEA_API_BASE_URL ?? 'http://gitea:3000/api/v1'
    )
    this.giteaWebBaseUrl = env.GITEA_WEB_BASE_URL
    this.giteaClientId = env.GITEA_CLIENT_ID
    this.giteaClientSecret = env.GITEA_CLIENT_SECRET
  }

  async init() {
    if (this.port === undefined) {
      await this.configure()
    }
    this.auth = new Auth({
      baseUrl: this.baseUrl,
      remoteBaseUrl: this.remoteBaseUrl,
      giteaAppBaseUrl: this.giteaAppBaseUrl,
      giteaApiBaseUrl: this.giteaApiBaseUrl,
      giteaWebBaseUrl: this.giteaWebBaseUrl,
      giteaClientId: this.giteaClientId,
      giteaClientSecret: this.giteaClientSecret,
    })
    this.frontend = new Frontend({
      appBaseUrl: this.giteaAppBaseUrl,
      apiBaseUrl: this.giteaApiBaseUrl,
    })
    await Promise.all([
      ...([
        'loader',
        'editor',
        'forms',
        'menu',
        'settings',
        'dialog',
        'storage',
        'editor-lib-codemirror',
      ].map(repo => (
        server.frontend.loadRepo(
          'macchiato',
          repo,
          {srcPath: [], destPath: [repo]}
        )
      ))),
      server.frontend.loadRepo(
        'macchiato',
        'pages',
        {srcPath: [], destPath: []}
      ),
      server.frontend.loadRepo(
        'macchiato',
        'server',
        {
          srcPath: [],
          destPath: ['server'],
          ref: 'shared-server'
        }
      ),
    ])
    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.startsWith(`${this.baseUrl}/api/auth`)) {
      await this.auth.serve(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() {
    if (!this.server) {
      await this.init()
    }
    this.server = Deno.listen({
      port: this.port,
    })
    for await (const conn of this.server) {
      this.serveConn(conn)
    }
  }
}