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

/**
 * The same as [`concat`]{@link module:Collections.concat} but runs a maximum of `limit` async operations at a time.
 *
 * @name concatLimit
 * @static
 * @memberOf module:Collections
 * @method
 * @see [async.concat]{@link module:Collections.concat}
 * @category Collection
 * @alias flatMapLimit
 * @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 - A function to apply to each item in `coll`,
 * which should use an array as its result. Invoked with (item, callback).
 * @param {Function} [callback] - A callback which is called after all the
 * `iteratee` functions have finished, or an error occurs. Results is an array
 * containing the concatenated results of the `iteratee` function. Invoked with
 * (err, results).
 * @returns A Promise, if no callback is passed
 */
function concatLimit(coll, limit, iteratee, callback) {
    var _iteratee = wrapAsync(iteratee);
    return mapLimit(coll, limit, (val, iterCb) => {
        _iteratee(val, (err, ...args) => {
            if (err) return iterCb(err);
            return iterCb(err, args);
        });
    }, (err, mapResults) => {
        var result = [];
        for (var i = 0; i < mapResults.length; i++) {
            if (mapResults[i]) {
                result = result.concat(...mapResults[i]);
            }
        }

        return callback(err, result);
    });
}
export default awaitify(concatLimit, 4)