var firstSeatLabel = 1;

            $(document).ready(function() {
                var $cart = $('#selected-seats'),
                    $counter = $('#counter'),
                    $total = $('#total'),
                    sc = $('#seat-map').seatCharts({
                    map: [
            'cccccc',
            '_',
            'cccccc',
            'cccccc',
                    ],
                    seats: {
            h: {
                            price   : 2500,
                            classes : 'student-class',
                            category: 'Student Seat'
                        },      
                    },
                    naming : {
            rows: ['1','','2','3'],
                        top : false,
                        getLabel : function (character, row, column) {
              if (row == '1') {
                return column;
              } else if (row == '2') {
                return column;
              } else if (row == '3') {
                return column;
              }
                        },
                    },
                    legend : {
                        node : $('#legend'),
                        items : [
                [ 'c', 'available', 'Dostępne miejsce'],
                [ 'f', 'unavailable', 'Zajęte miejsce']
                        ]                   
                    },
                    click: function () {
                        if (this.status() == 'available' && recalculateTotal(sc) < 1) {
                            //let's create a new <li> which we'll add to the cart items
                            $('<li> rząd '+ this.settings.row + ', miejsce '+this.settings.label+ ' <a href="#" class="cancel-cart-item">[cancel]</a></li>')
                                .attr('id', 'cart-item-'+this.settings.id)
                                .data('seatId', this.settings.id)
                                .appendTo($cart);
                            
                            /*
                             * Lets update the counter and total
                             *
                             * .find function will not find the current seat, because it will change its stauts only after return
                             * 'selected'. This is why we have to add 1 to the length and the current seat price to the total.
                             */
                            $counter.text(sc.find('selected').length+1);
                            $total.text(recalculateTotal(sc)+1);
                            
                            return 'selected';
                        } else if (this.status() == 'selected') {
                            //update the counter
                            $counter.text(sc.find('selected').length-1);
                            //and total
                            $total.text(recalculateTotal(sc)-1);
                        
                            //remove the item from our cart
                            $('#cart-item-'+this.settings.id).remove();
                        
                            //seat has been vacated
                            return 'available';
                        } else if (this.status() == 'unavailable') {
                            //seat has been already booked
                            return 'unavailable';
                        } else {
                            return this.style();
                        }
                    }
                });

                //this will handle "[cancel]" link clicks
                $('#selected-seats').on('click', '.cancel-cart-item', function () {
                    //let's just trigger Click event on the appropriate seat, so we don't have to repeat the logic here
                    sc.get($(this).parents('li:first').data('seatId')).click();
                });

                //let's pretend some seats have already been booked
                //sc.get(['1_2', '4_1', '7_1', '7_2']).status('unavailable');
        
        });

        function recalculateTotal(sc) {
            var total = 0;
        
            //basically find every selected seat and sum its price
            sc.find('selected').each(function () {
                total += 1;//this.data().price;
            });
            
            return total;
        }