/**
 * 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'
    )
  }
}

// 获取昨天

export function getYestoday() {
  let d = new Date().getTime() - 1000 * 60 * 60 * 24
  return parseTime(new Date(new Date().getTime() - 1000 * 60 * 60 * 24), "{yy}-{mm}-{dd}")
}

/**
 * @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
}

/**
 * 函数防抖 
 * @param fn
 * @param delay
 * @returns {Function}
 * @constructor
 */
export const Debounce = (fn, t) => {
  let delay = t || 500;
  let timer;
  return function () {
    let args = arguments;
    if (timer) {
      clearTimeout(timer);
    }
    timer = setTimeout(() => {
      timer = null;
      fn.apply(this, args);
    }, delay);
  }
};


/**
1. 函数节流
2. @param fn
3. @param interval
4. @returns {Function}
5. @constructor
*/
export const Throttle = (fn, t) => {
  let last;
  let timer;
  let interval = t || 500;
  return function () {
    let args = arguments;
    let now = +new Date();
    if (last && now - last < interval) {
      clearTimeout(timer);
      timer = setTimeout(() => {
        last = now;
        fn.apply(this, args);
      }, interval);
    } else {
      last = now;
      fn.apply(this, args);
    }
  }
}

// // 获取完整的url，根据环境进行配置
// export function getFullUrl(url) {
//   let fullUrl = ''
//   if (url && url.indexOf('http') != -1 && url.indexOf('files') != -1) {
//     let urlArr = url.split('files')
//     fullUrl = '/files' + urlArr[1]
//   } else if (url && url.indexOf('http') == -1 && url.indexOf('files') == -1) {
//     fullUrl = '/files' + url
//   } else {
//     fullUrl = url
//   }
//   return fullUrl
// }

// 获取完整的url，根据环境进行配置
export function getFullUrl(url) {
  let fullUrl = ''
  if (url && url.indexOf('http') != -1 && url.indexOf('files') != -1) {
    let urlArr = url.split('files')
    fullUrl = '/files' + urlArr[1]
  } else if (url && url.indexOf('http') == -1 && url.indexOf('files') == -1) {
    fullUrl = '/files' + url
  } else {
    fullUrl = url
  }
  return fullUrl
}


/**
 * 增加万单位 
 * @param num 
 */
export function formatNum(num) {
  num = Number(num);
  if (num == 0) {
    return num + '';
  } else
    if (num > 0 && num < 10000) {
      return num + '';
    } else {
      return (num / 10000).toFixed(1) + 'w';
    }
}


// 格式化文件大小
export function renderSize(value) {
  if (null == value || value == '') {
    return "0 Bytes";
  }
  var unitArr = new Array("Bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB");
  var index = 0;
  var srcsize = parseFloat(value);
  index = Math.floor(Math.log(srcsize) / Math.log(1024));
  var size = srcsize / Math.pow(1024, index);
  size = size.toFixed(2);//保留的小数位数
  return size + unitArr[index];
}

// 监听某元素是否在可视区，使用getBoundingClientRect
export const isElementInViewport2 = function (content) {
  let scrollTop =
    window.pageYOffset ||
    document.documentElement.scrollTop ||
    document.body.scrollTop;
  let clientHeight =
    document.documentElement.clientHeight || window.innerHeight;
  if (content) {
    return (content.offsetTop + content.offsetHeight > scrollTop &&
      content.offsetTop < scrollTop + clientHeight)
  }
};
