'use strict';

var eachOfLimit = require('../../../_virtual/eachOfLimit2.js');
var once = require('./once.js');
var iterator = require('./iterator.js');
var onlyOnce = require('./onlyOnce.js');
var wrapAsync = require('./wrapAsync.js');
var asyncEachOfLimit = require('./asyncEachOfLimit.js');
var breakLoop = require('./breakLoop.js');

(function (module, exports) {

	Object.defineProperty(exports, "__esModule", {
	    value: true
	});

	var _once = once.onceExports;

	var _once2 = _interopRequireDefault(_once);

	var _iterator = iterator.iteratorExports;

	var _iterator2 = _interopRequireDefault(_iterator);

	var _onlyOnce = onlyOnce.onlyOnceExports;

	var _onlyOnce2 = _interopRequireDefault(_onlyOnce);

	var _wrapAsync = wrapAsync.__require();

	var _asyncEachOfLimit = asyncEachOfLimit.asyncEachOfLimitExports;

	var _asyncEachOfLimit2 = _interopRequireDefault(_asyncEachOfLimit);

	var _breakLoop = breakLoop.breakLoopExports;

	var _breakLoop2 = _interopRequireDefault(_breakLoop);

	function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

	exports.default = limit => {
	    return (obj, iteratee, callback) => {
	        callback = (0, _once2.default)(callback);
	        if (limit <= 0) {
	            throw new RangeError('concurrency limit cannot be less than 1');
	        }
	        if (!obj) {
	            return callback(null);
	        }
	        if ((0, _wrapAsync.isAsyncGenerator)(obj)) {
	            return (0, _asyncEachOfLimit2.default)(obj, limit, iteratee, callback);
	        }
	        if ((0, _wrapAsync.isAsyncIterable)(obj)) {
	            return (0, _asyncEachOfLimit2.default)(obj[Symbol.asyncIterator](), limit, iteratee, callback);
	        }
	        var nextElem = (0, _iterator2.default)(obj);
	        var done = false;
	        var canceled = false;
	        var running = 0;
	        var looping = false;

	        function iterateeCallback(err, value) {
	            if (canceled) return;
	            running -= 1;
	            if (err) {
	                done = true;
	                callback(err);
	            } else if (err === false) {
	                done = true;
	                canceled = true;
	            } else if (value === _breakLoop2.default || done && running <= 0) {
	                done = true;
	                return callback(null);
	            } else if (!looping) {
	                replenish();
	            }
	        }

	        function replenish() {
	            looping = true;
	            while (running < limit && !done) {
	                var elem = nextElem();
	                if (elem === null) {
	                    done = true;
	                    if (running <= 0) {
	                        callback(null);
	                    }
	                    return;
	                }
	                running += 1;
	                iteratee(elem.value, elem.key, (0, _onlyOnce2.default)(iterateeCallback));
	            }
	            looping = false;
	        }

	        replenish();
	    };
	};

	module.exports = exports.default; 
} (eachOfLimit.__module, eachOfLimit.__module.exports));

var eachOfLimitExports = eachOfLimit.__module.exports;

exports.eachOfLimitExports = eachOfLimitExports;
