var App_Cart_Cart = {
    _options: [],
    _elements: [],
    _priceInfo: null,
    _loaderSrc: 'images/loading-arrow-16x16.gif',
    _loaderAlt: 'loading',
    _loaderClass: 'loader',
    _qtyElementPrefix: 'quantity-',
    _updateActionAjax: 'updateItem',
    _subTotalContainerId: 'subtotal-price-container',
    _rowCellPriceClass: 'cell_price',
    _rowCellTotalClass: 'cell_row_total',
    _headerItemCartCountId: 'header-cart-item-count',
    _headerItemCartCountTextId: 'header-cart-item-count-text',

    init: function(options)
    {
        $.extend(this._options, options);
        this._initQuantityElements();
    },

    _initQuantityElements: function()
    {
        var obj = this;
        $('input[name^=' + this._qtyElementPrefix + ']').autoNumeric({aSep: '', aDec: ''});
        if (this._options.qtyList) {
            for (var elementId in this._options.qtyList) {
                this._elements[this._qtyElementPrefix + elementId] = this._options.qtyList[elementId];
            }
        }
        $('input[name^=' + this._qtyElementPrefix + ']').keyup(function(eventObject) {
            obj._onQuantityKeyup(eventObject);
        }).blur(function(eventObject) {
            obj._onQuantityBlur(eventObject);
        });

    },

    _onQuantityKeyup: function(eventObject)
    {
        var targetName = eventObject.target.name;
        var itemId = targetName.replace(this._qtyElementPrefix, '');
        var existsCacheQty = this._elements.hasOwnProperty(targetName);
        var newQty = parseInt(eventObject.target.value);
        if (!isNaN(newQty) && ((!existsCacheQty && newQty) || (existsCacheQty && newQty != this._elements[targetName]))) {
            if (newQty == 0) {
                this.restoreQuantity(eventObject)
            } else {
                this._elements[targetName] = newQty;
                this._recalculate(targetName, itemId);
            }
        }
    },

    _onQuantityBlur: function(eventObject)
    {
        this.restoreQuantity(eventObject);
    },

    restoreQuantity: function(eventObject)
    {
        var targetName = eventObject.target.name;
        var qty = parseInt(this._elements[targetName]);
        if (!isNaN(qty) && qty > 0) {
            eventObject.target.value = qty;
        }
    },

    _recalculate: function(targetName, itemId)
    {
        if (!this._elements[targetName]) {
            return false;
        }
        var target = $('input[name=' + targetName + ']');
        target.after($('<img/>', {'src': this._loaderSrc, 'alt': this._loaderAlt, 'class': this._loaderClass}));
        var obj = this;
        $.ajax({
            url: qs.constant('BASE_URL') + '/' + qs.constant('CURRENT_PAGE'),
            data: {action: obj._updateActionAjax, 'qty': obj._elements[targetName], 'itemId': itemId},
            dataType: 'json',
            async: false,
            type: 'POST'
        }).fail(function (status) { alert(status.responseText); }).done(
            function (data) {
                if (data.success) {
                    target.parents('td').siblings('.' + obj._rowCellPriceClass).html(data.rowPrice);
                    target.parents('td').siblings('.' + obj._rowCellTotalClass).html(data.rowTotal);
                    $('#' + obj._subTotalContainerId).html(data.subTotal);
                    $('#' + obj._headerItemCartCountId).html(data.itemsCount);
                    $('#' + obj._headerItemCartCountTextId).html('Item' + (parseInt(data.itemsCount) == 1 ? 's' : ''))
                    if (typeof App_Cart_Small != 'undefined') {
                        App_Cart_Small.reset();
                        App_Cart_Small.updateQty(data.quantity);
                    }
                }
            }
        );
        target.siblings('.' + this._loaderClass).remove();

        return true;
    }
};