var jQuery = (typeof(window) != 'undefined') ? window.jQuery : require('jquery');

// Sphinx theme nav state
function ThemeNav () {

    var nav = {
        navBar: null,
        win: null,
        winScroll: false,
        winResize: false,
        linkScroll: false,
        winPosition: 0,
        winHeight: null,
        docHeight: null,
        isRunning: false
    };

    nav.enable = function () {
        var self = this;

        if (!self.isRunning) {
            self.isRunning = true;
            jQuery(function ($) {
                self.init($);

                self.reset();
                self.win.on('hashchange', self.reset);

                // Set scroll monitor
                self.win.on('scroll', function () {
                    if (!self.linkScroll) {
                        self.winScroll = true;
                    }
                });
                setInterval(function () { if (self.winScroll) self.onScroll(); }, 25);

                // Set resize monitor
                self.win.on('resize', function () {
                    self.winResize = true;
                });
                setInterval(function () { if (self.winResize) self.onResize(); }, 25);
                self.onResize();
            });
        };
    };

    nav.init = function ($) {
        var doc = $(document),
            self = this;

        this.navBar = $('div.wy-side-scroll:first');
        this.win = $(window);

        // Set up javascript UX bits
        $(document)
            // Shift nav in mobile when clicking the menu.
            .on('click', "[data-toggle='wy-nav-top']", function() {
                $("[data-toggle='wy-nav-shift']").toggleClass("shift");
                $("[data-toggle='rst-versions']").toggleClass("shift");
            })

            // Nav menu link click operations
            .on('click', ".wy-menu-vertical .current ul li a", function() {
                var target = $(this);
                // Close menu when you click a link.
                $("[data-toggle='wy-nav-shift']").removeClass("shift");
                $("[data-toggle='rst-versions']").toggleClass("shift");
                // Handle dynamic display of l3 and l4 nav lists
                self.toggleCurrent(target);
                self.hashChange();
            })
            .on('click', "[data-toggle='rst-current-version']", function() {
                $("[data-toggle='rst-versions']").toggleClass("shift-up");
            })

        // Make tables responsive
        $("table.docutils:not(.field-list)")
            .wrap("<div class='wy-table-responsive'></div>");

        // Add expand links to all parents of nested ul
        $('.wy-menu-vertical ul').not('.simple').siblings('a').each(function () {
            var link = $(this);
                expand = $('<span class="toctree-expand"></span>');
            expand.on('click', function (ev) {
                self.toggleCurrent(link);
                ev.stopPropagation();
                return false;
            });
            link.prepend(expand);
        });
    };

    nav.reset = function () {
        // Get anchor from URL and open up nested nav
        var anchor = encodeURI(window.location.hash);
        if (anchor) {
            try {
                var link = $('.wy-menu-vertical')
                    .find('[href="' + anchor + '"]');
                $('.wy-menu-vertical li.toctree-l1 li.current')
                    .removeClass('current');
                link.closest('li.toctree-l2').addClass('current');
                link.closest('li.toctree-l3').addClass('current');
                link.closest('li.toctree-l4').addClass('current');
            }
            catch (err) {
                console.log("Error expanding nav for anchor", err);
            }
        }
    };

    nav.onScroll = function () {
        this.winScroll = false;
        var newWinPosition = this.win.scrollTop(),
            winBottom = newWinPosition + this.winHeight,
            navPosition = this.navBar.scrollTop(),
            newNavPosition = navPosition + (newWinPosition - this.winPosition);
        if (newWinPosition < 0 || winBottom > this.docHeight) {
            return;
        }
        this.navBar.scrollTop(newNavPosition);
        this.winPosition = newWinPosition;
    };

    nav.onResize = function () {
        this.winResize = false;
        this.winHeight = this.win.height();
        this.docHeight = $(document).height();
    };

    nav.hashChange = function () {
        this.linkScroll = true;
        this.win.one('hashchange', function () {
            this.linkScroll = false;
        });
    };

    nav.toggleCurrent = function (elem) {
        var parent_li = elem.closest('li');
        parent_li.siblings('li.current').removeClass('current');
        parent_li.siblings().find('li.current').removeClass('current');
        parent_li.find('> ul li.current').removeClass('current');
        parent_li.toggleClass('current');
    }

    return nav;
};

module.exports.ThemeNav = ThemeNav();

if (typeof(window) != 'undefined') {
    window.SphinxRtdTheme = { StickyNav: module.exports.ThemeNav };
}