(function ($, window) {
    'use strict';

    var activeRequests = {};

    function cardSelector() {
        return '.modern-auction-card, .modern-future-card, .modern-winner-card';
    }

    function findGrid(container) {
        return container.children('.modern-auction-grid, .modern-future-grid, .modern-winner-grid').first();
    }

    function idsFrom(container) {
        var ids = [];
        findGrid(container).find(cardSelector()).each(function () {
            ids.push(this.id || 'no-id-' + ids.length);
        });
        return ids.join('|');
    }

    function mergeCards(target, incoming) {
        var currentGrid = findGrid(target);
        var incomingGrid = findGrid(incoming);
        var currentItems = {};

        if (!incomingGrid.length) {
            target.html(incoming.html());
            return true;
        }

        if (!currentGrid.length) {
            target.html(incoming.html());
            return true;
        }

        currentGrid.find(cardSelector()).each(function () {
            if (this.id) {
                currentItems[this.id] = $(this).detach();
            }
        });

        currentGrid.empty();
        incomingGrid.find(cardSelector()).each(function () {
            var incomingItem = $(this);
            var id = this.id;
            if (id && currentItems[id]) {
                currentGrid.append(currentItems[id]);
            } else {
                currentGrid.append(incomingItem.clone(true, true));
            }
        });

        return true;
    }

    function refreshBlock(target) {
        var url = target.attr('data-auction-block');
        var key = target.attr('id');

        if (!url || !key || activeRequests[key]) {
            return;
        }

        activeRequests[key] = true;
        $.ajax({ url: url, cache: false })
            .done(function (html) {
                var incoming = $('<div></div>').html(html);
                if (idsFrom(target) === idsFrom(incoming)) {
                    return;
                }
                if (mergeCards(target, incoming)) {
                    $(document).trigger('ganabid:auctions-refreshed');
                }
            })
            .always(function () {
                activeRequests[key] = false;
            });
    }

    function refreshAll() {
        var now = new Date().getTime();
        $('.modern-auction-refresh').each(function () {
            var target = $(this);
            var url = target.attr('data-auction-block') || '';
            var interval = url.indexOf('/closed') !== -1 ? 45000 : 15000;
            var lastRefresh = target.data('modernLastRefresh') || 0;

            if (now - lastRefresh < interval) {
                return;
            }

            target.data('modernLastRefresh', now);
            refreshBlock(target);
        });
    }

    $(function () {
        window.setTimeout(refreshAll, 1200);
        window.setInterval(refreshAll, 15000);
    });
}(jQuery, window));