var _ = require('../util')
var Path = require('../parsers/path')

/**
 * Filter filter for v-repeat
 *
 * @param {String} searchKey
 * @param {String} [delimiter]
 * @param {String} dataKey
 */

exports.filterBy = function (arr, search, delimiter, dataKey) {
  // allow optional `in` delimiter
  // because why not
  if (delimiter && delimiter !== 'in') {
    dataKey = delimiter
  }
  if (search == null) {
    return arr
  }
  // cast to lowercase string
  search = ('' + search).toLowerCase()
  return arr.filter(function (item) {
    return dataKey
      ? contains(Path.get(item, dataKey), search)
      : contains(item, search)
  })
}

/**
 * Filter filter for v-repeat
 *
 * @param {String} sortKey
 * @param {String} reverse
 */

exports.orderBy = function (arr, sortKey, reverse) {
  if (!sortKey) {
    return arr
  }
  var order = 1
  if (arguments.length > 2) {
    if (reverse === '-1') {
      order = -1
    } else {
      order = reverse ? -1 : 1
    }
  }
  // sort on a copy to avoid mutating original array
  return arr.slice().sort(function (a, b) {
    if (sortKey !== '$key' && sortKey !== '$value') {
      if (a && '$value' in a) a = a.$value
      if (b && '$value' in b) b = b.$value
    }
    a = _.isObject(a) ? Path.get(a, sortKey) : a
    b = _.isObject(b) ? Path.get(b, sortKey) : b
    return a === b ? 0 : a > b ? order : -order
  })
}

/**
 * String contain helper
 *
 * @param {*} val
 * @param {String} search
 */

function contains (val, search) {
  if (_.isPlainObject(val)) {
    for (var key in val) {
      if (contains(val[key], search)) {
        return true
      }
    }
  } else if (_.isArray(val)) {
    var i = val.length
    while (i--) {
      if (contains(val[i], search)) {
        return true
      }
    }
  } else if (val != null) {
    return val.toString().toLowerCase().indexOf(search) > -1
  }
}