/**
 * Created by PanJiaChen on 16/11/18.
 */

/**
 * Parse the time to string
 * @param {(Object|string|number)} time
 * @param {string} cFormat
 * @returns {string | null}
 */
export function parseTime(time, cFormat) {
  if (arguments.length === 0 || !time) {
    return null
  }
  const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
  let date
  if (typeof time === 'object') {
    date = time
  } else {
    if ((typeof time === 'string')) {
      if ((/^[0-9]+$/.test(time))) {
        // support "1548221490638"
        time = parseInt(time)
      } else {
        // support safari
        // https://stackoverflow.com/questions/4310953/invalid-date-in-safari
        time = time.replace(new RegExp(/-/gm), '/')
      }
    }

    if ((typeof time === 'number') && (time.toString().length === 10)) {
      time = time * 1000
    }
    date = new Date(time)
  }
  const formatObj = {
    y: date.getFullYear(),
    m: date.getMonth() + 1,
    d: date.getDate(),
    h: date.getHours(),
    i: date.getMinutes(),
    s: date.getSeconds(),
    a: date.getDay()
  }
  const time_str = format.replace(/{([ymdhisa])+}/g, (result, key) => {
    const value = formatObj[key]
    // Note: getDay() returns 0 on Sunday
    if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value ] }
    return value.toString().padStart(2, '0')
  })
  return time_str
}

/**
 * @param {number} time
 * @param {string} option
 * @returns {string}
 */
export function formatTime(time, option) {
  if (('' + time).length === 10) {
    time = parseInt(time) * 1000
  } else {
    time = +time
  }
  const d = new Date(time)
  const now = Date.now()

  const diff = (now - d) / 1000

  if (diff < 30) {
    return '刚刚'
  } else if (diff < 3600) {
    // less 1 hour
    return Math.ceil(diff / 60) + '分钟前'
  } else if (diff < 3600 * 24) {
    return Math.ceil(diff / 3600) + '小时前'
  } else if (diff < 3600 * 24 * 2) {
    return '1天前'
  }
  if (option) {
    return parseTime(time, option)
  } else {
    return (
      d.getMonth() +
      1 +
      '月' +
      d.getDate() +
      '日' +
      d.getHours() +
      '时' +
      d.getMinutes() +
      '分'
    )
  }
}

/**
 * @param {string} url
 * @returns {Object}
 */
export function param2Obj(url) {
  const search = decodeURIComponent(url.split('?')[1]).replace(/\+/g, ' ')
  if (!search) {
    return {}
  }
  const obj = {}
  const searchArr = search.split('&')
  searchArr.forEach(v => {
    const index = v.indexOf('=')
    if (index !== -1) {
      const name = v.substring(0, index)
      const val = v.substring(index + 1, v.length)
      obj[name] = val
    }
  })
  return obj
}

export function deepCopy(data) {
  //string,number,bool,null,undefined,symbol
  //object,array,date
  if (data && typeof data === "object") {
    //针对函数的拷贝
    if (typeof data === "function") {
      let tempFunc = data.bind(null);
      tempFunc.prototype = deepCopy(data.prototype);
      return tempFunc;
    }

    switch (Object.prototype.toString.call(data)) {
      case "[object String]":
        return data.toString();
      case "[object Number]":
        return Number(data.toString());
      case "[object Boolean]":
        return Boolean(data.toString());
      case "[object Date]":
        return new Date(data.getTime());
      case "[object Array]":
        let arr = [];
        for (let i = 0; i < data.length; i++) {
          arr[i] = deepCopy(data[i]);
        }
        return arr;

      //js自带对象或用户自定义类实例
      case "[object Object]":
        let obj = {};
        for (let key in data) {
          //会遍历原型链上的属性方法，可以用hasOwnProperty来控制 （obj.hasOwnProperty(prop)
          obj[key] = deepCopy(data[key]);
        }
        return obj;
    }
  } else {
    //string,number,bool,null,undefined,symbol
    return data;
  }
}
export function throttle(fn, interval, immediate=true) {
  // 1.记录上一次的开始时间
  let lastTime = 0

  // 2.事件触发时, 真正执行的函数
  return function(...args) {

    // 2.1.获取当前事件触发时的时间
    const nowTime = new Date().getTime()
    //当lastTime为0时且第一次不执行，此时 remainTime = interval - (nowTime - lastTime) = interval > 0
    if (!lastTime && !immediate) lastTime = nowTime//决定第一次是否执行函数

    // 2.2.使用当前触发的时间和之前的时间间隔以及上一次开始的时间, 计算出还剩余多长事件需要去触发函数
    const remainTime = interval - (nowTime - lastTime)
    if (remainTime <= 0) {
      // 2.3.真正触发函数
      fn.apply(this, args)
      // 2.4.保留上次触发的时间
      lastTime = nowTime
    }
  }

}