import {del, get, set} from 'idb-keyval';

import {encode} from '@/net/packets/index.js';
import Server from '@/net/server.js';
import {withResolvers} from '@/util/promise.js';
import {readAsset} from '@/util/resources.js';

import createEcs from './create/ecs.js';
import './create/forest.js';
import './create/homestead.js';
import './create/player.js';
import './create/town.js';

import Engine from './engine.js';

class WorkerServer extends Server {
  constructor() {
    super();
    this.fs = {};
  }
  static qualify(path) {
    return ['UNIVERSE', path].join('/');
  }
  async readAsset(path) {
    const resource = await readAsset(path);
    return resource
      ? resource
      : new ArrayBuffer(0);
  }
  async readData(path) {
    const data = await get(this.constructor.qualify(path));
    if ('undefined' !== typeof data) {
      return data;
    }
    const error = new Error();
    error.code = 'ENOENT';
    throw error;
  }
  async removeData(path) {
    await del(this.constructor.qualify(path));
  }
  async writeData(path, view) {
    await set(this.constructor.qualify(path), view);
  }
  transmit(connection, packed) { postMessage(packed); }
}

const engine = new Engine(WorkerServer);

onmessage = async (event) => {
  if (0 === event.data) {
    await engine.disconnectPlayer(0);
    engine.stop();
    await engine.saveEcses();
    postMessage(0);
    return;
  }
  engine.server.accept(0, event.data);
};

(async () => {
  await engine.load();
  engine.start();
  await engine.connectPlayer(0, 0);
  postMessage(encode({type: 'ConnectionStatus', payload: 'connected'}));
})();

if (import.meta.hot) {
  const before = withResolvers();
  const promises = [before.promise];
  const accepted = [
    '/app/server/engine.js',
    '/app/server/create/player.js',
    '/app/server/create/forest.js',
    '/app/server/create/town.js',
    '/app/server/create/homestead.js',
  ];
  let isAccepted = false;
  import.meta.hot.on('vite:beforeUpdate', async ({updates}) => {
    isAccepted = !!updates.find(({acceptedPath}) => accepted.includes(acceptedPath));
    if (!isAccepted) {
      return;
    }
    await engine.disconnectPlayer(0);
    engine.stop();
    await engine.saveEcses();
    before.resolve();
  });
  import.meta.hot.accept('./engine.js');
  import.meta.hot.accept('./create/player.js', async ({default: createPlayer}) => {
    const {promise, resolve} = withResolvers();
    promises.push(promise);
    await before.promise;
    const oldPlayer = await engine.loadPlayer(0);
    const player = await createPlayer(0);
    // Less jarring
    player.Ecs = oldPlayer.Ecs;
    player.Direction = oldPlayer.Direction;
    player.Position = oldPlayer.Position;
    await engine.savePlayer(0, player);
    resolve();
  });
  import.meta.hot.accept('./create/forest.js', async ({default: createForest}) => {
    const {promise, resolve} = withResolvers();
    promises.push(promise);
    await before.promise;
    delete engine.ecses['forests/0'];
    await engine.server.removeData('forests/0');
    const forest = createEcs(engine.Ecs);
    for (const entity of await createForest()) {
      await forest.create(entity);
    }
    await engine.saveEcs('forests/0', forest);
    resolve();
  });
  import.meta.hot.accept('./create/homestead.js', async ({default: createHomestead}) => {
    const {promise, resolve} = withResolvers();
    promises.push(promise);
    await before.promise;
    delete engine.ecses['homesteads/0'];
    await engine.server.removeData('homesteads/0');
    const homestead = createEcs(engine.Ecs);
    for (const entity of await createHomestead('0')) {
      await homestead.create(entity);
    }
    await engine.saveEcs('homesteads/0', homestead);
    resolve();
  });
import.meta.hot.accept('./create/town.js', async ({default: createTown}) => {
    const {promise, resolve} = withResolvers();
    promises.push(promise);
    await before.promise;
    delete engine.ecses['town'];
    await engine.server.removeData('town');
    const town = createEcs(engine.Ecs);
    for (const entity of await createTown()) {
      await town.create(entity);
    }
    await engine.saveEcs('town', town);
    resolve();
  });
  import.meta.hot.on('vite:afterUpdate', async () => {
    if (!isAccepted) {
      return;
    }
    await Promise.all(promises);
    postMessage(encode({type: 'ConnectionStatus', payload: 'aborted'}));
    postMessage(encode({type: 'EcsChange'}));
    close();
  });
  import.meta.hot.accept();
}