import mapLimit from './mapLimit.js'
import wrapAsync from './internal/wrapAsync.js'
import awaitify from './internal/awaitify.js'

/**
 * The same as [`groupBy`]{@link module:Collections.groupBy} but runs a maximum of `limit` async operations at a time.
 *
 * @name groupByLimit
 * @static
 * @memberOf module:Collections
 * @method
 * @see [async.groupBy]{@link module:Collections.groupBy}
 * @category Collection
 * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
 * @param {number} limit - The maximum number of async operations at a time.
 * @param {AsyncFunction} iteratee - An async function to apply to each item in
 * `coll`.
 * The iteratee should complete with a `key` to group the value under.
 * Invoked with (value, callback).
 * @param {Function} [callback] - A callback which is called when all `iteratee`
 * functions have finished, or an error occurs. Result is an `Object` whoses
 * properties are arrays of values which returned the corresponding key.
 * @returns {Promise} a promise, if no callback is passed
 */
function groupByLimit(coll, limit, iteratee, callback) {
    var _iteratee = wrapAsync(iteratee);
    return mapLimit(coll, limit, (val, iterCb) => {
        _iteratee(val, (err, key) => {
            if (err) return iterCb(err);
            return iterCb(err, {key, val});
        });
    }, (err, mapResults) => {
        var result = {};
        // from MDN, handle object having an `hasOwnProperty` prop
        var {hasOwnProperty} = Object.prototype;

        for (var i = 0; i < mapResults.length; i++) {
            if (mapResults[i]) {
                var {key} = mapResults[i];
                var {val} = mapResults[i];

                if (hasOwnProperty.call(result, key)) {
                    result[key].push(val);
                } else {
                    result[key] = [val];
                }
            }
        }

        return callback(err, result);
    });
}

export default awaitify(groupByLimit, 4);