import * as CONST from '../common/constants';

export default () => {

    var $win     = $(window);
    var $html    = $('html');
    var $body    = $('body');
    var $sidebar = $('.sidebar');
    var mq       = CONST.APP_MEDIAQUERY;

    // AUTOCOLLAPSE ITEMS
    // -----------------------------------

    var sidebarCollapse = $sidebar.find('.collapse');
    sidebarCollapse.on('show.bs.collapse', function(event){

        event.stopPropagation();
        if ( $(this).parents('.collapse').length === 0 )
            sidebarCollapse.filter('.in').collapse('hide');

    });

    // SIDEBAR ACTIVE STATE
    // -----------------------------------

    // // Find current active item
    // var currentItem = $('.sidebar .active').parents('li');

    // // hover mode don't try to expand active collapse
    // if ( ! useAsideHover() )
    //   currentItem
    //     .addClass('active')     // activate the parent
    //     .children('.collapse')  // find the collapse
    //     .collapse('show');      // and show it

    // // remove this if you use only collapsible sidebar items
    // $sidebar.find('li > a + ul').on('show.bs.collapse', function (e) {
    //   if( useAsideHover() ) e.preventDefault();
    // });

    // SIDEBAR COLLAPSED ITEM HANDLER
    // -----------------------------------


    var eventName = isTouch() ? 'click' : 'mouseenter' ;
    var subNav = $();
    $sidebar.on( eventName, '.nav > li', function() {

        if( isSidebarCollapsed() || useAsideHover() ) {

            subNav.trigger('mouseleave');
            subNav = toggleMenuItem( $(this) );

            // Used to detect click and touch events outside the sidebar
            sidebarAddBackdrop();
        }

    });

    var sidebarAnyclickClose = $sidebar.data('sidebarAnyclickClose');

    // Allows to close
    if ( typeof sidebarAnyclickClose !== 'undefined' ) {

        $('.wrapper').on('click.sidebar', function(e){
            // don't check if sidebar not visible
            if( ! $body.hasClass('aside-toggled')) return;

            var $target = $(e.target);
            if( ! $target.parents('.aside').length && // if not child of sidebar
                ! $target.parents('.topnavbar-wrapper').length && // if not child of header
                ! $target.is('#user-block-toggle') && // user block toggle anchor
                ! $target.parent().is('#user-block-toggle') // user block toggle icon
              ) {
                $body.removeClass('aside-toggled');
            }

        });
    }



    function sidebarAddBackdrop() {
        var $backdrop = $('<div/>', { 'class': 'dropdown-backdrop'} );
        $backdrop.insertAfter('.aside').on("click mouseenter", function () {
            removeFloatingNav();
        });
    }

    // Open the collapse sidebar submenu items when on touch devices
    // - desktop only opens on hover
    function toggleTouchItem($element){
        $element
            .siblings('li')
            .removeClass('open')
            .end()
            .toggleClass('open');
    }

    // Handles hover to open items under collapsed menu
    // -----------------------------------
    function toggleMenuItem($listItem) {

        removeFloatingNav();

        var ul = $listItem.children('ul');

        if( !ul.length ) return $();
        if( $listItem.hasClass('open') ) {
            toggleTouchItem($listItem);
            return $();
        }

        var $aside = $('.aside');
        var $asideInner = $('.aside-inner'); // for top offset calculation
        // float aside uses extra padding on aside
        var mar = parseInt( $asideInner.css('padding-top'), 0) + parseInt( $aside.css('padding-top'), 0);

        var subNav = ul.clone().appendTo( $aside );

        toggleTouchItem($listItem);

        var itemTop = ($listItem.position().top + mar) - $sidebar.scrollTop();
        var vwHeight = $win.height();

        subNav
            .addClass('nav-floating')
            .css({
                position: isFixed() ? 'fixed' : 'absolute',
                top:      itemTop,
                bottom:   (subNav.outerHeight(true) + itemTop > vwHeight) ? 0 : 'auto'
            });

        subNav.on('mouseleave', function() {
            toggleTouchItem($listItem);
            subNav.remove();
        });

        return subNav;
    }

    function removeFloatingNav() {
        $('.sidebar-subnav.nav-floating').remove();
        $('.dropdown-backdrop').remove();
        $('.sidebar li.open').removeClass('open');
    }

    function isTouch() {
        return $html.hasClass('touch');
    }
    function isSidebarCollapsed() {
        return $body.hasClass('aside-collapsed');
    }
    function isSidebarToggled() {
        return $body.hasClass('aside-toggled');
    }
    function isMobile() {
        return $win.width() < mq.tablet;
    }
    function isFixed(){
        return $body.hasClass('layout-fixed');
    }
    function useAsideHover() {
        return $body.hasClass('aside-hover');
    }

} // rendered