'use strict';

const { Each } = require('./each');
const { setShorthand } = require('./internal/collection');

class Some extends Each {
  constructor(collection, iterator) {
    super(collection, iterator, setShorthand);
    this._result = false;
  }

  _callResolve(value) {
    if (value) {
      this._promise._resolve(true);
    } else if (--this._rest === 0) {
      this._promise._resolve(false);
    }
  }
}

module.exports = { some, Some };

/**
 * `Aigle.some` has almost the same functionality as `Array#some`.
 * It iterates all elements of `collection` and executes `iterator` using each element on parallel.
 * The `iterator` needs to return a promise or something..
 * If a promise is returned, the function will wait until the promise is fulfilled.
 * If the result is truthy, the function will return true otherwise false.
 * @param {Array|Object} collection
 * @param {Function|Array|Object|string} iterator
 * @return {Aigle} Returns an Aigle instance
 * @example
 * const order = [];
 * const collection = [1, 4, 2];
 * const iterator = num => {
 *   return Aigle.delay(num * 10)
 *     .then(() => {
 *       order.push(num);
 *       return num % 2 === 0;
 *     });
 * };
 * Aigle.some(collection, iterator)
 *   .then(bool => {
 *     console.log(bool); // true
 *     console.log(order); // [1, 2]
 *   });
 *
 * @example
 * const order = [];
 * const collection = { a: 1, b: 4, c: 2 };
 * const iterator = num => {
 *   return Aigle.delay(num * 10)
 *     .then(() => {
 *       order.push(num);
 *       return num % 2 === 0;
 *     });
 * };
 * Aigle.some(collection, iterator)
 *   .then(bool => {
 *     console.log(bool); // true
 *     console.log(order); // [1, 2]
 *   });
 *
 * @example
 * const order = [];
 * const collection = [1, 4, 2];
 * const iterator = num => {
 *   return Aigle.delay(num * 10)
 *     .then(() => {
 *       order.push(num);
 *       return false;
 *     });
 * };
 * Aigle.some(collection, iterator)
 *   .then(bool => {
 *     console.log(bool); // false
 *     console.log(order); // [1, 2, 4]
 *   });
 *
 * @example
 * const collection = [{
 *  uid: 1, active: false
 * }, {
 *  uid: 4, active: true
 * }, {
 *  uid: 2, active: true
 * }];
 * Aigle.some(collection, 'active')
 *   .then(value => console.log(value)); // true
 *
 * @example
 * const collection = [{
 *  uid: 1, active: false
 * }, {
 *  uid: 4, active: true
 * }, {
 *  uid: 2, active: true
 * }];
 * Aigle.some(collection, ['uid', 4])
 *   .then(value => console.log(value)); // true
 *
 * @example
 * const collection = [{
 *  uid: 1, active: false
 * }, {
 *  uid: 4, active: true
 * }, {
 *  uid: 2, active: true
 * }];
 * Aigle.some(collection, { uid: 4 })
 *   .then(value => console.log(value)); // true
 */
function some(collection, iterator) {
  return new Some(collection, iterator)._execute();
}