(function ($) {
    $.fn.bitTopMenu = function (options) {
        return this.each(function() {
            if (undefined == $(this).data('bitTopMenu')) {
                var plugin = new $.bitTopMenu(this, options);
                $(this).data('bitTopMenu', plugin);
            }
        });
    };

    $.bitTopMenu = function (element, options) {

        var _element = $(element);

        var plugin = this;
        plugin.settings = {};       //ustawienia pluginu
        var defaults = {};

        // stan włączenia menu w trybie mobilnym
        var isMobileView = false;

        var isMoreBtnVisible = false;

        // Ostatnia szerokość okna. Służy do optymalizacji wywołań alignMenu()
        var lastWitdh = 0;

        var isHoverEnabled = false;

        plugin.turnOnHover = function() {
            if (isHoverEnabled) {
                return;
            }

            _element.find('.nav > li > a').keypress(function (e) {

                if (!/(37|38|39|40)/.test(e.keyCode)) return;

                var target = $( e.target );

                switch(e.keyCode) {
                    case 37: // next
                        target.parent().prev().find('a:first').focus().click();
                        break;
                    case 39: // next
                        target.parent().next().find('a:first').focus().click();
                        break;
                    case 40: // next
                        target.children('li a:first').focus();
                        break;
                }
            });

            _element.find('ul.dropdown-menu li > a').keypress(function (e) {

                if (!/(37|38|39|40)/.test(e.keyCode)) return;

                var target = $( e.target );

                switch(e.keyCode) {
                    case 37: // next
                        target.click();
                        break;
                    case 39: // next
                        target.click();
                        break;
                    case 40: // next
                        target.children('li a:first').focus();
                        break;
                }
            });

            // 2 level
            _element.find('.nav > li.dropdown').hover(function() {
                _element.find('.open').removeClass('open');
                $(this).addClass('open');
            }, function() {
                $(this).removeClass('open');
            }).find('ul.dropdown-menu > li.dropdown').hover(function() {
                $(this).siblings('.open').removeClass('open');
                $(this).addClass('open');
            }, function() {
                $(this).removeClass('open');
            });

            _element.find('ul.dropdown-menu li a:not([data-toggle])').hover(function (event) {
                $(this).parent().siblings('.open').removeClass('open');
            });

            _element.find('ul.dropdown-menu [data-toggle=dropdown]').on('click mouseover', function(event) {
                // Avoid following the href location when clicking
                event.preventDefault();
                // Avoid having the menu to close when clicking
                event.stopPropagation();
                // If a menu is already open we close it
                //$('ul.dropdown-menu [data-toggle=dropdown]').parent().removeClass('open');
                // opening the one you clicked on
                $(this).parent().siblings('.open').removeClass('open');
                $(this).parent().addClass('open');
            });
            isHoverEnabled = true;
        };

        plugin.turnOffHover = function() {
            if (isHoverEnabled) {
                // wyłączenie obsługi hover
                _element.find('.nav li.dropdown').unbind('mouseenter mouseleave');
                isHoverEnabled = false;
            }
        };

        plugin.removeMoreButton = function() {
            if (isMoreBtnVisible) {
                _element.find(".main-nav").append(_element.find(".navbar-right .dropdown-menu").html());
                _element.find(".navbar-right").remove();
                isMoreBtnVisible = false;
            }
        };

        plugin.alignMenu = function() {

            var li_sum = 0;
            _element.find('.navbar-nav > li').each(function() {
                li_sum += $(this).outerWidth(true);
            });

            var w = 0;
            var mw = _element.find(".navbar-collapse").width() - 130;
            var menuhtml = $('<div>');

            if ( _element.find(".navbar-nav").width() < li_sum) {
                jQuery.each(_element.find(".navbar-nav").children(), function() {
                    w += $(this).outerWidth(true);
                    if (mw < w) {
                        menuhtml.append(this);
                    }
                });

                var moreElement = _element.find(".navbar-right");
                if (menuhtml.children().length > 0) {
                    if (moreElement.length > 0) {
                        moreElement.find("ul:first-child.dropdown-menu").prepend(menuhtml.html());
                    }
                    else {
                        _element.find(".navbar-collapse").append (
                            '<ul class="nav navbar-nav navbar-right">'
                            + '<li class="dropdown">'
                            + '<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Więcej <span class="caret"></span></a>'
                            + '<ul class="dropdown-menu">'
                            + menuhtml.html()
                            + '</ul></li></ul>'
                        );
                    }
                    isMoreBtnVisible = true;
                }
            }
        };

        plugin.detectMobile = function() {
            // detect if mobile
            this.isMobileView = window.innerWidth < 767;

            // the same on resize
            $( window ).resize(function() {
                this.isMobileView = window.innerWidth < 767;
            });
        };

        plugin.init = function() {
            plugin.settings = $.extend({}, defaults, options);
            lastWitdh = window.innerWidth;
            plugin.detectMobile();

            if(!isMobileView) {
                if ("more" in plugin.settings && plugin.settings.more == 1) {
                    plugin.alignMenu();
                }
                plugin.turnOnHover();
                this.isMobileView = false;
            }
            else {
                isMobileView = true;
            }

            $(window).resize(function() {

                // Blokada działania, jeśli nie ma zmiany szerokości
                // a tylko np. wysokości.
                if(window.innerWidth == lastWitdh) {
                    return;
                }

                plugin.removeMoreButton();
                if(!isMobileView) {
                    plugin.turnOnHover();
                    if ("more" in plugin.settings && plugin.settings.more == 1) {
                        plugin.alignMenu();
                    }
                }
            });
        };

        plugin.init();
    };

})(jQuery);