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

import {encode} from '@/packets/index.js';

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

import Engine from '../../engine.js';
import Server from './server.js';

class WorkerServer extends Server {
  constructor() {
    super();
    this.fs = {};
  }
  static qualify(path) {
    return ['UNIVERSE', path].join('/');
  }
  async readAsset(path) {
    return fetch(path).then((response) => (
      response.ok ? response.arrayBuffer() : 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) {
    engine.stop();
    await engine.disconnectPlayer(0);
    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 createResolver = () => {
    let r;
    const promise = new Promise((resolve) => {
      r = resolve;
    });
    promise.resolve = r;
    return promise;
  };
  const beforeResolver = createResolver();
  const resolvers = [beforeResolver];
  import.meta.hot.on('vite:beforeUpdate', async () => {
    engine.stop();
    await engine.disconnectPlayer(0);
    await engine.saveEcses();
    beforeResolver.resolve();
  });
  import.meta.hot.accept('../../engine.js');
  import.meta.hot.accept('../../create-player.js', async ({default: createPlayer}) => {
    const resolver = createResolver();
    resolvers.push(resolver);
    await beforeResolver;
    const oldBuffer = await engine.server.readData('players/0');
    const oldPlayer = JSON.parse((new TextDecoder()).decode(oldBuffer));
    const buffer = await createPlayer(0);
    const player = JSON.parse((new TextDecoder()).decode(buffer));
    // Less jarring
    player.Ecs = oldPlayer.Ecs;
    player.Direction = oldPlayer.Direction;
    player.Position = oldPlayer.Position;
    await engine.server.writeData('players/0', (new TextEncoder()).encode(JSON.stringify(player)));
    resolver.resolve();
  });
  import.meta.hot.accept('../../create-forest.js', async ({default: createForest}) => {
    const resolver = createResolver();
    resolvers.push(resolver);
    await beforeResolver;
    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);
    resolver.resolve();
  });
  import.meta.hot.accept('../../create-homestead.js', async ({default: createHomestead}) => {
    const resolver = createResolver();
    resolvers.push(resolver);
    await beforeResolver;
    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);
    resolver.resolve();
  });
  import.meta.hot.on('vite:afterUpdate', async () => {
    await Promise.all(resolvers);
    postMessage(encode({type: 'ConnectionStatus', payload: 'aborted'}));
    close();
  });
  import.meta.hot.accept();
}