import { init_count_down, init_count_interval } from '@/utils/game_setting/game_config';

const delay = (timeout: any) => new Promise(resolve => setTimeout(resolve, timeout));

interface CountDownClockBase {
  task_id: NodeJS.Timeout;
  count: number;
  record_start_time: Date|any;
  record_stop_time: Date|any;
  is_clock_stop: boolean;
  is_restart_timeout: boolean;
  render: Function;
}

export class CountDownClock<CountDownClockBase> {
  static task_id: NodeJS.Timeout;
  static count = init_count_down;
  static record_start_time: Date|any;
  static record_stop_time: Date|any;
  static is_clock_stop: boolean = true;
  static is_restart_timeout: boolean = false;
  static render: Function = () => {};

  static _check_is_end() {
    if (this.count <= 0) {
      this.count = 0;
      this.render();
      clearInterval(this.task_id);
      return true;
    }
    return false;
  }

  static async start() {
    if (!this.is_clock_stop || this.is_restart_timeout) return;
    if (this.record_stop_time && this.record_start_time) {
      // 是暂停的开始, 精确计算暂停时间。
      const time_gap = (this.record_stop_time.getTime() - this.record_start_time.getTime()) % init_count_interval;
      this.is_restart_timeout = true;
      await delay(init_count_interval - time_gap);
      this.is_restart_timeout = false;
      if (this._check_is_end()) {
        return ;
      }
      this.count--;
      this.render();
    }
    this.is_clock_stop = false;
    clearInterval(this.task_id);
    this.task_id = setInterval(() => {
      if (this._check_is_end()) {
        return ;
      }
      this.count--;
      this.render();
    }, init_count_interval);
    this.record_start_time = new Date();
  }
  static async stop() {
    if (this.is_restart_timeout) { setTimeout(() => { this.stop() }, 1000); return; }
    this.is_clock_stop = true;
    clearInterval(this.task_id);
    this.record_stop_time = new Date();
  }
  static destory() {
    clearInterval(this.task_id);
    this.is_clock_stop = true;
    this.is_restart_timeout = false;
    this.record_start_time = undefined;
    this.record_stop_time = undefined;
  }
}