import { Injectable } from '@angular/core';

import { Log } from '../utils/log'
const log = new Log('Timer');

@Injectable()
export class Timer {

  constructor() {}

  /**
   * 创建倒计时
   * @param $scope  作用域
   * @param name  挂载在$scope下的变量
   * @param sep 倒计时分隔符
   */
  create = ($scope, name?, sep?, pure?) => {
    name = name || 'countdown';
    let timer;

    return {
      /**
       * 实际倒计时执行方法
       * @param second 剩余时间(秒)
       * @param finished 倒计时结束时的回调
       */
      start: (second, finished) => {
        $scope[name] = this.secondToTime(second, sep, pure);

        const count = () => {
          $scope[name] = this.secondToTime(--second, sep, pure);

          if(second > 0){
            timer = setTimeout(() => {
              count();
            },1000);
          }else{
            if(timer) clearTimeout(timer);
            if(finished && typeof finished === 'function') finished();
          }
        }

        count();

        return () => {
          if(timer) clearTimeout(timer);
        }
      }
    }
  }

  // 秒转时分秒
  secondToTime =  (second, sep, pure) => {
    sep = sep || ':';

    if(pure){
      return second;
    }else{
      if(sep === ':'){
        return [
          parseInt((second / 60 / 60).toString()),
          parseInt((second / 60).toString()) % 60, second % 60
        ].join(sep)
          .replace(/\b(\d)\b/g, "0$1");
      }else{
        return this.splitSecondToTime(second,sep);
      }
    }
  }

  // 分割为指定格式
  splitSecondToTime =  (second,sep) => {
    var seps = sep.split('|');
    var str = '';

    var days = parseInt((second / 60 / 60 / 24).toString());
    var hours = parseInt((second / 60 / 60).toString()) % 24;
    var minutes = parseInt((second / 60).toString()) % 60;
    var seconds = second % 60;

    if(seps.length == 3){ // 一般为时分秒
      str = (hours > 0 ? (hours + seps[0]) : '') +
        (minutes > 0 ? (minutes + seps[1]) : '') +
        (seconds >= 0 ? (seconds + seps[2]) : '');
    }else if(seps.length == 4){ //一般为天时分秒
      str = (days > 0 ? (days + seps[0]) : '') +
        (hours > 0 ? (hours + seps[1]) : '') +
        (minutes > 0 ? (minutes + seps[2]) : '') +
        (seconds >= 0 ? (seconds + seps[3]) : '');
    }

    return str;
  }

}