/*
 * Copyright Elasticsearch B.V. and other contributors where applicable.
 * Licensed under the BSD 2-Clause License; you may not use this file except in
 * compliance with the BSD 2-Clause License.
 */

'use strict';

// TODO: Move to a separate module
const arrays = Symbol('sets');

function ensureArray(arrays, key) {
  const array = arrays[key];
  if (array) return array;

  arrays[key] = [];
  return arrays[key];
}

class NamedArray {
  constructor() {
    this[arrays] = {};
  }

  get keys() {
    return Object.keys(this[arrays]);
  }

  add(key, value) {
    return ensureArray(this[arrays], key).push(value);
  }

  clear(key) {
    if (this.has(key)) {
      delete this[arrays][key];
    }
  }

  delete(key, value) {
    const array = this.get(key);
    if (array) {
      const index = array.indexOf(value);
      if (index !== -1) {
        array.splice(index, 1);
        if (!array.length) {
          this.clear(key);
        }
      }
    }
  }

  has(key) {
    return key in this[arrays];
  }

  get(key) {
    return this[arrays][key];
  }
}

module.exports = NamedArray;