import {compose} from '@avocado/core';
import {Synchronized} from '@avocado/state';
import {Ticker} from '@avocado/timing';

import {WorldTimePacket} from './world-time.packet';

const MAGIC_TO_FIT_HOUR_INTO_USHORT = 2730;

const decorate = compose(
  Synchronized,
);

export class WorldTime extends decorate(class {}) {

  constructor() {
    super();
    this._hour = 0;
    this._isUpdateReady = true;
    this._lastHour = 0;
    this.ticker = new Ticker(0.25);
    this.ticker.on('tick', () => {
      this._isUpdateReady = true;
    });
  }

  acceptPacket(packet) {
    if (packet instanceof WorldTimePacket) {
      this._hour = packet.data / MAGIC_TO_FIT_HOUR_INTO_USHORT;
    }
  }

  static format(time) {
    const rawHour = (time + 12) % 12;
    const hour = Math.floor(0 === Math.floor(rawHour) ? 12 : rawHour);
    const minutes = String(Math.floor((rawHour - Math.floor(rawHour)) * 60)).padStart(2, '0');
    if (time >= 12) {
      return `${hour}:${minutes} pm`;
    }
    else {
      return `${hour}:${minutes} am`;
    }
  }

  get hour() {
    return this._hour;
  }

  set hour(hour) {
    this._hour = hour;
  }

  packetsForUpdate(force) {
    const updates = [];
    if (force || this._isUpdateReady) {
      updates.push(new WorldTimePacket(
        (this._hour * MAGIC_TO_FIT_HOUR_INTO_USHORT) >> 0
      ));
    }
    if (!force) {
      this._isUpdateReady = false;
    }
    return updates;
  }

  secondsPerHour() {
    return 60;
  }

  tick(elapsed) {
    this._hour += (elapsed / this.secondsPerHour());
    this._hour = this._hour % 24;
    this.ticker.tick(elapsed);
  }

}