'use strict';
/**
 * @param {...Function} funcs The functions to compose.
 * @returns {Function} A function obtained by composing the argument functions
 * from right to left. For example, compose(f, g, h) is identical to doing
 * (...args) => f(g(h(...args))).
 */
export function compose(...args) {
  for (var _len = args.length, funcs = Array(_len), _key = 0;
       _key < _len;
       _key++) {
    funcs[_key] = args[_key];
  }

  if (funcs.length === 0) {
    return function (arg) {
      return arg;
    };
  }

  if (funcs.length === 1) {
    return funcs[0];
  }

  var last = funcs[funcs.length - 1];
  var rest = funcs.slice(0, -1);
  return function () {
    return rest.reduceRight(function (composed, f) {
      return f(composed);
    }, last.apply(undefined, args));
  };
}

// == 生成uuid
export function uuid() {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
    return v.toString(16);
  });
}

// == 浅复制
export function extend() {
  var args = Array.prototype.slice.apply(arguments);
  var finalObj = {};
  args.map(function (obj) {
    for (var name in obj) {
      finalObj[name] = obj[name];
    }
  });
  return finalObj;
}

// == 防抖函数
export function debounce(func, wait) {
  var timer;
  return function (...args) {
    var context = this;
    clearTimeout(timer);
    timer = setTimeout(function () {
      func.apply(context, args);
    }, wait);
  }
}

function firstWordToUpper(str) {
  return str.substr(0,1).toLocaleUpperCase() + str.substr(1);
};

function firstWordToLower(str) {
  return str.substr(0,1).toLocaleLowerCase() + str.substr(1);
};

export const letter = {
  firstWordToUpper,
  firstWordToLower,
  // 路径转驼峰写法
  pathToCamelCase: (path, firstLower?) => {
    firstLower = firstLower || false;
    var parts = path.split('/');

    var output = '';
    for (var i = 0, n = parts.length; i < n; i++) {
      var part = parts[i];
      output = output + firstWordToUpper(part);
    }


    // 首字母是否小写(默认为大写)
    return firstLower
      ? firstWordToLower(output) : output;
  }
}

// == dom操作集
export const dom = {
  isIdSelector: (target) => {
    return target.indexOf('#') > -1;
  }
}


export const base64ImageSize = function (base64Image) {
  var str = base64Image.substring(22).replace('=',''); // 去除头部
  var strLength = parseInt(str.length);
  var fileLength = strLength - (strLength/8) *2;
  return fileLength;
}


/**
 * 版本比较,1为大于，0为相等，-1为小于
 * @param ver1
 * @param ver2
 */
export const compareVersion = function(ver1, ver2) {
  if(!ver1) return -1;
  if(ver1 === ver2) return 0;
  var ver1Arr = ver1.split('.');
  var ver2Arr = ver2.split('.');
  var ver1Count = ver1Arr.length;
  var ver2Count = ver2Arr.length;
  var len = Math.max(ver1Count, ver2Count);
  for (var i = 0, n = len; i < n; i++) {
    var num1 = ver1Arr[i] || 0;
    var num2 = ver2Arr[i] || 0;
    if(num1 === num2) continue;
    if(num1 > num2) return 1;
    if(num1 < num2) return -1;
  }
  return 0;
}