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;(function ( $, window, undefined ) {

/** Default settings */
    var defaults = {
        active: null,
        event: 'click',
        disabled: [],
        collapsible: 'accordion',
        startCollapsed: false,
        rotate: false,
        setHash: false,
        animation: 'default',
        animationQueue: false,
        duration: 500,
        fluidHeight: true,
        scrollToAccordion: false,
        scrollToAccordionOnLoad: true,
        scrollToAccordionOffset: 0,
        accordionTabElement: '<div></div>',
        click: function(){},
        activate: function(){},
        deactivate: function(){},
        load: function(){},
        activateState: function(){},
        classes: {
            stateDefault: 'r-tabs-state-default',
            stateActive: 'r-tabs-state-active',
            stateDisabled: 'r-tabs-state-disabled',
            stateExcluded: 'r-tabs-state-excluded',
            container: 'r-tabs',
            ul: 'r-tabs-nav',
            tab: 'r-tabs-tab',
            anchor: 'r-tabs-anchor',
            panel: 'r-tabs-panel',
            accordionTitle: 'r-tabs-accordion-title'
        }
    };

/**
     * Responsive Tabs
     * @constructor
     * @param {object} element - The HTML element the validator should be bound to
     * @param {object} options - An option map
     */
    function ResponsiveTabs(element, options) {
        this.element = element; // Selected DOM element
        this.$element = $(element); // Selected jQuery element

this.tabs = []; // Create tabs array
        this.state = ''; // Define the plugin state (tabs/accordion)
        this.rotateInterval = 0; // Define rotate interval
        this.$queue = $({});

// Extend the defaults with the passed options
        this.options = $.extend( {}, defaults, options);

this.init();
    }

/**
     * This function initializes the tab plugin
     */
    ResponsiveTabs.prototype.init = function () {
        var _this = this;

// Load all the elements
        this.tabs = this._loadElements();
        this._loadClasses();
        this._loadEvents();

// Window resize bind to check state
        $(window).on('resize', function(e) {
            _this._setState(e);
            if(_this.options.fluidHeight !== true) {
                _this._equaliseHeights();
            }
        });

// Hashchange event
        $(window).on('hashchange', function(e) {
            var tabRef = _this._getTabRefBySelector(window.location.hash);
            var oTab = _this._getTab(tabRef);

// Check if a tab is found that matches the hash
            if(tabRef >= 0 && !oTab._ignoreHashChange && !oTab.disabled) {
                // If so, open the tab and auto close the current one
                _this._openTab(e, _this._getTab(tabRef), true);
            }
        });

// Start rotate event if rotate option is defined
        if(this.options.rotate !== false) {
            this.startRotation();
        }

// Set fluid height
        if(this.options.fluidHeight !== true) {
            _this._equaliseHeights();
        }

// --------------------
        // Define plugin events
        //

// Activate: this event is called when a tab is selected
        this.$element.bind('tabs-click', function(e, oTab) {
            _this.options.click.call(this, e, oTab);
        });

// Activate: this event is called when a tab is selected
        this.$element.bind('tabs-activate', function(e, oTab) {
            _this.options.activate.call(this, e, oTab);
        });
        // Deactivate: this event is called when a tab is closed
        this.$element.bind('tabs-deactivate', function(e, oTab) {
            _this.options.deactivate.call(this, e, oTab);
        });
        // Activate State: this event is called when the plugin switches states
        this.$element.bind('tabs-activate-state', function(e, state) {
            _this.options.activateState.call(this, e, state);
        });

// Load: this event is called when the plugin has been loaded
        this.$element.bind('tabs-load', function(e) {
            var startTab;

_this._setState(e); // Set state

// Check if the panel should be collaped on load
            if(_this.options.startCollapsed !== true && !(_this.options.startCollapsed === 'accordion' && _this.state === 'accordion')) {

startTab = _this._getStartTab();

// Open the initial tab
                _this._openTab(e, startTab); // Open first tab

// Call the callback function
                _this.options.load.call(this, e, startTab); // Call the load callback
            }
        });
        // Trigger loaded event
        this.$element.trigger('tabs-load');
    };

//
    // PRIVATE FUNCTIONS
    //

/**
     * This function loads the tab elements and stores them in an array
     * @returns {Array} Array of tab elements
     */
    ResponsiveTabs.prototype._loadElements = function() {
        var _this = this;
        var $ul = this.$element.children('ul:first');
        var tabs = [];
        var id = 0;

// Add the classes to the basic html elements
        this.$element.addClass(_this.options.classes.container); // Tab container
        $ul.addClass(_this.options.classes.ul); // List container

// Get tab buttons and store their data in an array
        $('li', $ul).each(function() {
            var $tab = $(this);
            var isExcluded = $tab.hasClass(_this.options.classes.stateExcluded);
            var $anchor, $panel, $accordionTab, $accordionAnchor, panelSelector;

// Check if the tab should be excluded
            if(!isExcluded) {

$anchor = $('a', $tab);
                panelSelector = $anchor.attr('href');
                $panel = $(panelSelector);
                $accordionTab = $(_this.options.accordionTabElement).insertBefore($panel);
                $accordionAnchor = $('<a></a>').attr('href', panelSelector).html($anchor.html()).appendTo($accordionTab);

var oTab = {
                    _ignoreHashChange: false,
                    id: id,
                    disabled: ($.inArray(id, _this.options.disabled) !== -1),
                    tab: $(this),
                    anchor: $('a', $tab),
                    panel: $panel,
                    selector: panelSelector,
                    accordionTab: $accordionTab,
                    accordionAnchor: $accordionAnchor,
                    active: false
                };

// 1up the ID
                id++;
                // Add to tab array
                tabs.push(oTab);
            }
        });
        return tabs;
    };

/**
     * This function adds classes to the tab elements based on the options
     */
    ResponsiveTabs.prototype._loadClasses = function() {
        for (var i=0; i<this.tabs.length; i++) {
            this.tabs[i].tab.addClass(this.options.classes.stateDefault).addClass(this.options.classes.tab);
            this.tabs[i].anchor.addClass(this.options.classes.anchor);
            this.tabs[i].panel.addClass(this.options.classes.stateDefault).addClass(this.options.classes.panel);
            this.tabs[i].accordionTab.addClass(this.options.classes.accordionTitle);
            this.tabs[i].accordionAnchor.addClass(this.options.classes.anchor);
            if(this.tabs[i].disabled) {
                this.tabs[i].tab.removeClass(this.options.classes.stateDefault).addClass(this.options.classes.stateDisabled);
                this.tabs[i].accordionTab.removeClass(this.options.classes.stateDefault).addClass(this.options.classes.stateDisabled);
           }
        }
    };

/**
     * This function adds events to the tab elements
     */
    ResponsiveTabs.prototype._loadEvents = function() {
        var _this = this;

// Define activate event on a tab element
        var fActivate = function(e) {
            var current = _this._getCurrentTab(); // Fetch current tab
            var activatedTab = e.data.tab;

e.preventDefault();

// Trigger click event for whenever a tab is clicked/touched even if the tab is disabled
            activatedTab.tab.trigger('tabs-click', activatedTab);

// Make sure this tab isn't disabled
            if(!activatedTab.disabled) {

// Check if hash has to be set in the URL location
                if(_this.options.setHash) {
                    // Set the hash using the history api if available to tackle Chromes repaint bug on hash change
                    if(history.pushState) {
                        history.pushState(null, null, window.location.origin + window.location.pathname + window.location.search + activatedTab.selector);
                    } else {
                        // Otherwise fallback to the hash update for sites that don't support the history api
                        window.location.hash = activatedTab.selector;
                    }
                }

e.data.tab._ignoreHashChange = true;

// Check if the activated tab isnt the current one or if its collapsible. If not, do nothing
                if(current !== activatedTab || _this._isCollapisble()) {
                    // The activated tab is either another tab of the current one. If it's the current tab it is collapsible
                    // Either way, the current tab can be closed
                    _this._closeTab(e, current);

// Check if the activated tab isnt the current one or if it isnt collapsible
                    if(current !== activatedTab || !_this._isCollapisble()) {
                        _this._openTab(e, activatedTab, false, true);
                    }
                }
            }
        };

// Loop tabs
        for (var i=0; i<this.tabs.length; i++) {
            // Add activate function to the tab and accordion selection element
            this.tabs[i].anchor.on(_this.options.event, {tab: _this.tabs[i]}, fActivate);
            this.tabs[i].accordionAnchor.on(_this.options.event, {tab: _this.tabs[i]}, fActivate);
        }
    };

/**
     * This function gets the tab that should be opened at start
     * @returns {Object} Tab object
     */
    ResponsiveTabs.prototype._getStartTab = function() {
        var tabRef = this._getTabRefBySelector(window.location.hash);
        var startTab;

// Check if the page has a hash set that is linked to a tab
        if(tabRef >= 0 && !this._getTab(tabRef).disabled) {
            // If so, set the current tab to the linked tab
            startTab = this._getTab(tabRef);
        } else if(this.options.active > 0 && !this._getTab(this.options.active).disabled) {
            startTab = this._getTab(this.options.active);
        } else {
            // If not, just get the first one
            startTab = this._getTab(0);
        }

return startTab;
    };

/**
     * This function sets the current state of the plugin
     * @param {Event} e - The event that triggers the state change
     */
    ResponsiveTabs.prototype._setState = function(e) {
        var $ul = $('ul:first', this.$element);
        var oldState = this.state;
        var startCollapsedIsState = (typeof this.options.startCollapsed === 'string');
        var startTab;

// The state is based on the visibility of the tabs list
        if($ul.is(':visible')){
            // Tab list is visible, so the state is 'tabs'
            this.state = 'tabs';
        } else {
            // Tab list is invisible, so the state is 'accordion'
            this.state = 'accordion';
        }

// If the new state is different from the old state
        if(this.state !== oldState) {
            // If so, the state activate trigger must be called
            this.$element.trigger('tabs-activate-state', {oldState: oldState, newState: this.state});

// Check if the state switch should open a tab
            if(oldState && startCollapsedIsState && this.options.startCollapsed !== this.state && this._getCurrentTab() === undefined) {
                // Get initial tab
                startTab = this._getStartTab(e);
                // Open the initial tab
                this._openTab(e, startTab); // Open first tab
            }
        }
    };

/**
     * This function opens a tab
     * @param {Event} e - The event that triggers the tab opening
     * @param {Object} oTab - The tab object that should be opened
     * @param {Boolean} closeCurrent - Defines if the current tab should be closed
     * @param {Boolean} stopRotation - Defines if the tab rotation loop should be stopped
     */
    ResponsiveTabs.prototype._openTab = function(e, oTab, closeCurrent, stopRotation) {
        var _this = this;
        var scrollOffset;

// Check if the current tab has to be closed
        if(closeCurrent) {
            this._closeTab(e, this._getCurrentTab());
        }

// Check if the rotation has to be stopped when activated
        if(stopRotation && this.rotateInterval > 0) {
            this.stopRotation();
        }

// Set this tab to active
        oTab.active = true;
        // Set active classes to the tab button and accordion tab button
        oTab.tab.removeClass(_this.options.classes.stateDefault).addClass(_this.options.classes.stateActive);
        oTab.accordionTab.removeClass(_this.options.classes.stateDefault).addClass(_this.options.classes.stateActive);

// Run panel transiton
        _this._doTransition(oTab.panel, _this.options.animation, 'open', function() {
            var scrollOnLoad = (e.type !== 'tabs-load' || _this.options.scrollToAccordionOnLoad);

// When finished, set active class to the panel
            oTab.panel.removeClass(_this.options.classes.stateDefault).addClass(_this.options.classes.stateActive);

// And if enabled and state is accordion, scroll to the accordion tab
            if(_this.getState() === 'accordion' && _this.options.scrollToAccordion && (!_this._isInView(oTab.accordionTab) || _this.options.animation !== 'default') && scrollOnLoad) {

// Add offset element's height to scroll position
                scrollOffset = oTab.accordionTab.offset().top - _this.options.scrollToAccordionOffset;

// Check if the animation option is enabled, and if the duration isn't 0
                if(_this.options.animation !== 'default' && _this.options.duration > 0) {
                    // If so, set scrollTop with animate and use the 'animation' duration
                    $('html, body').animate({
                        scrollTop: scrollOffset
                    }, _this.options.duration);
                } else {
                    //  If not, just set scrollTop
                    $('html, body').scrollTop(scrollOffset);
                }
            }
        });

this.$element.trigger('tabs-activate', oTab);
    };

/**
     * This function closes a tab
     * @param {Event} e - The event that is triggered when a tab is closed
     * @param {Object} oTab - The tab object that should be closed
     */
    ResponsiveTabs.prototype._closeTab = function(e, oTab) {
        var _this = this;
        var doQueueOnState = typeof _this.options.animationQueue === 'string';
        var doQueue;

if(oTab !== undefined) {
            if(doQueueOnState && _this.getState() === _this.options.animationQueue) {
                doQueue = true;
            } else if(doQueueOnState) {
                doQueue = false;
            } else {
                doQueue = _this.options.animationQueue;
            }

// Deactivate tab
            oTab.active = false;
            // Set default class to the tab button
            oTab.tab.removeClass(_this.options.classes.stateActive).addClass(_this.options.classes.stateDefault);

// Run panel transition
            _this._doTransition(oTab.panel, _this.options.animation, 'close', function() {
                // Set default class to the accordion tab button and tab panel
                oTab.accordionTab.removeClass(_this.options.classes.stateActive).addClass(_this.options.classes.stateDefault);
                oTab.panel.removeClass(_this.options.classes.stateActive).addClass(_this.options.classes.stateDefault);
            }, !doQueue);

this.$element.trigger('tabs-deactivate', oTab);
        }
    };

/**
     * This function runs an effect on a panel
     * @param {Element} panel - The HTML element of the tab panel
     * @param {String} method - The transition method reference
     * @param {String} state - The state (open/closed) that the panel should transition to
     * @param {Function} callback - The callback function that is called after the transition
     * @param {Boolean} dequeue - Defines if the event queue should be dequeued after the transition
     */
    ResponsiveTabs.prototype._doTransition = function(panel, method, state, callback, dequeue) {
        var effect;
        var _this = this;

// Get effect based on method
        switch(method) {
            case 'slide':
                effect = (state === 'open') ? 'slideDown' : 'slideUp';
                break;
            case 'fade':
                effect = (state === 'open') ? 'fadeIn' : 'fadeOut';
                break;
            default:
                effect = (state === 'open') ? 'show' : 'hide';
                // When default is used, set the duration to 0
                _this.options.duration = 0;
                break;
        }

// Add the transition to a custom queue
        this.$queue.queue('responsive-tabs',function(next){
            // Run the transition on the panel
            panel[effect]({
                duration: _this.options.duration,
                complete: function() {
                    // Call the callback function
                    callback.call(panel, method, state);
                    // Run the next function in the queue
                    next();
                }
            });
        });

// When the panel is openend, dequeue everything so the animation starts
        if(state === 'open' || dequeue) {
            this.$queue.dequeue('responsive-tabs');
        }

};

/**
     * This function returns the collapsibility of the tab in this state
     * @returns {Boolean} The collapsibility of the tab
     */
    ResponsiveTabs.prototype._isCollapisble = function() {
        return (typeof this.options.collapsible === 'boolean' && this.options.collapsible) || (typeof this.options.collapsible === 'string' && this.options.collapsible === this.getState());
    };

/**
     * This function returns a tab by numeric reference
     * @param {Integer} numRef - Numeric tab reference
     * @returns {Object} Tab object
     */
    ResponsiveTabs.prototype._getTab = function(numRef) {
        return this.tabs[numRef];
    };

/**
     * This function returns the numeric tab reference based on a hash selector
     * @param {String} selector - Hash selector
     * @returns {Integer} Numeric tab reference
     */
    ResponsiveTabs.prototype._getTabRefBySelector = function(selector) {
        // Loop all tabs
        for (var i=0; i<this.tabs.length; i++) {
            // Check if the hash selector is equal to the tab selector
            if(this.tabs[i].selector === selector) {
                return i;
            }
        }
        // If none is found return a negative index
        return -1;
    };

/**
     * This function returns the current tab element
     * @returns {Object} Current tab element
     */
    ResponsiveTabs.prototype._getCurrentTab = function() {
        return this._getTab(this._getCurrentTabRef());
    };

/**
     * This function returns the next tab's numeric reference
     * @param {Integer} currentTabRef - Current numeric tab reference
     * @returns {Integer} Numeric tab reference
     */
    ResponsiveTabs.prototype._getNextTabRef = function(currentTabRef) {
        var tabRef = (currentTabRef || this._getCurrentTabRef());
        var nextTabRef = (tabRef === this.tabs.length - 1) ? 0 : tabRef + 1;
        return (this._getTab(nextTabRef).disabled) ? this._getNextTabRef(nextTabRef) : nextTabRef;
    };

/**
     * This function returns the previous tab's numeric reference
     * @returns {Integer} Numeric tab reference
     */
    ResponsiveTabs.prototype._getPreviousTabRef = function() {
        return (this._getCurrentTabRef() === 0) ? this.tabs.length - 1 : this._getCurrentTabRef() - 1;
    };

/**
     * This function returns the current tab's numeric reference
     * @returns {Integer} Numeric tab reference
     */
    ResponsiveTabs.prototype._getCurrentTabRef = function() {
        // Loop all tabs
        for (var i=0; i<this.tabs.length; i++) {
            // If this tab is active, return it
            if(this.tabs[i].active) {
                return i;
            }
        }
        // No tabs have been found, return negative index
        return -1;
    };

/**
     * This function gets the tallest tab and applied the height to all tabs
     */
    ResponsiveTabs.prototype._equaliseHeights = function() {
        var maxHeight = 0;

$.each($.map(this.tabs, function(tab) {
            maxHeight = Math.max(maxHeight, tab.panel.css('minHeight', '').height());
            return tab.panel;
        }), function() {
            this.css('minHeight', maxHeight);
        });
    };

//
    // HELPER FUNCTIONS
    //

ResponsiveTabs.prototype._isInView = function($element) {
        var docViewTop = $(window).scrollTop(),
            docViewBottom = docViewTop + $(window).height(),
            elemTop = $element.offset().top,
            elemBottom = elemTop + $element.height();
        return ((elemBottom <= docViewBottom) && (elemTop >= docViewTop));
    };

//
    // PUBLIC FUNCTIONS
    //

/**
     * This function activates a tab
     * @param {Integer} tabRef - Numeric tab reference
     * @param {Boolean} stopRotation - Defines if the tab rotation should stop after activation
     */
    ResponsiveTabs.prototype.activate = function(tabRef, stopRotation) {
        var e = jQuery.Event('tabs-activate');
        var oTab = this._getTab(tabRef);
        if(!oTab.disabled) {
            this._openTab(e, oTab, true, stopRotation || true);
        }
    };

/**
     * This function deactivates a tab
     * @param {Integer} tabRef - Numeric tab reference
     */
    ResponsiveTabs.prototype.deactivate = function(tabRef) {
        var e = jQuery.Event('tabs-dectivate');
        var oTab = this._getTab(tabRef);
        if(!oTab.disabled) {
            this._closeTab(e, oTab);
        }
    };

/**
     * This function enables a tab
     * @param {Integer} tabRef - Numeric tab reference
     */
    ResponsiveTabs.prototype.enable = function(tabRef) {
        var oTab = this._getTab(tabRef);
        if(oTab){
            oTab.disabled = false;
            oTab.tab.addClass(this.options.classes.stateDefault).removeClass(this.options.classes.stateDisabled);
            oTab.accordionTab.addClass(this.options.classes.stateDefault).removeClass(this.options.classes.stateDisabled);
        }
    };

/**
     * This function disable a tab
     * @param {Integer} tabRef - Numeric tab reference
     */
    ResponsiveTabs.prototype.disable = function(tabRef) {
        var oTab = this._getTab(tabRef);
        if(oTab){
            oTab.disabled = true;
            oTab.tab.removeClass(this.options.classes.stateDefault).addClass(this.options.classes.stateDisabled);
            oTab.accordionTab.removeClass(this.options.classes.stateDefault).addClass(this.options.classes.stateDisabled);
        }
    };

/**
     * This function gets the current state of the plugin
     * @returns {String} State of the plugin
     */
    ResponsiveTabs.prototype.getState = function() {
        return this.state;
    };

/**
     * This function starts the rotation of the tabs
     * @param {Integer} speed - The speed of the rotation
     */
    ResponsiveTabs.prototype.startRotation = function(speed) {
        var _this = this;
        // Make sure not all tabs are disabled
        if(this.tabs.length > this.options.disabled.length) {
            this.rotateInterval = setInterval(function(){
                var e = jQuery.Event('rotate');
                _this._openTab(e, _this._getTab(_this._getNextTabRef()), true);
            }, speed || (($.isNumeric(_this.options.rotate)) ? _this.options.rotate : 4000) );
        } else {
            throw new Error("Rotation is not possible if all tabs are disabled");
        }
    };

/**
     * This function stops the rotation of the tabs
     */
    ResponsiveTabs.prototype.stopRotation = function() {
        window.clearInterval(this.rotateInterval);
        this.rotateInterval = 0;
    };

/**
     * This function can be used to get/set options
     * @return {any} Option value
     */
    ResponsiveTabs.prototype.option = function(key, value) {
        if(value) {
            this.options[key] = value;
        }
        return this.options[key];
    };

/** jQuery wrapper */
    $.fn.responsiveTabs = function ( options ) {
        var args = arguments;
        var instance;

if (options === undefined || typeof options === 'object') {
            return this.each(function () {
                if (!$.data(this, 'responsivetabs')) {
                    $.data(this, 'responsivetabs', new ResponsiveTabs( this, options ));
                }
            });
        } else if (typeof options === 'string' && options[0] !== '_' && options !== 'init') {
            instance = $.data(this[0], 'responsivetabs');

// Allow instances to be destroyed via the 'destroy' method
            if (options === 'destroy') {
                // TODO: destroy instance classes, etc
                $.data(this, 'responsivetabs', null);
            }

if (instance instanceof ResponsiveTabs && typeof instance[options] === 'function') {
                return instance[options].apply( instance, Array.prototype.slice.call( args, 1 ) );
            } else {
                return this;
            }
        }
    };

}(jQuery, window));