/**
 * MIT License
 *
 * Copyright (c) 2019 Xu Liangzhan
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

import each from '../base/each'
import isFunction from '../base/isFunction'
import toNumber from '../number/toNumber'

const sum = (array, iterate, context) => {
  let result = 0
  let eachCallback

  if (iterate) {
    if (isFunction(iterate)) {
      eachCallback = (...args) => {
        result += toNumber(iterate.apply(context, args))
      }
    } else {
      eachCallback = (val) => {
        result += toNumber(val[iterate])
      }
    }
  } else {
    eachCallback = (val) => {
      result += toNumber(val)
    }
  }

  each(array, eachCallback)

  return result
}

export default sum