/**
 * Single Page Nav Plugin
 * Copyright (c) 2014 Chris Wojcik <hello@chriswojcik.net>
 * Dual licensed under MIT and GPL.
 * @author Chris Wojcik
 * @version 1.2.0
 */
if (typeof Object.create !== "function") {
    Object.create = function (e) {
        function t() {}
        t.prototype = e;
        return new t
    }
}(function (e, t, n, r) {
    "use strict";
    var i = {
        init: function (n, r) {
            this.options = e.extend({}, e.fn.singlePageNav.defaults, n);
            this.container = r;
            this.$container = e(r);
            this.$links = this.$container.find("a");
            if (this.options.filter !== "") {
                this.$links = this.$links.filter(this.options.filter)
            }
            this.$window = e(t);
            this.$htmlbody = e("html, body");
            this.$links.on("click.singlePageNav", e.proxy(this.handleClick, this));
            this.didScroll = false;
            this.checkPosition();
            this.setTimer()
        },
        handleClick: function (t) {
            var n = this,
                r = t.currentTarget,
                i = e(r.hash);
            t.preventDefault();
            if (i.length) {
                n.clearTimer();
                if (typeof n.options.beforeStart === "function") {
                    n.options.beforeStart()
                }
                n.setActiveLink(r.hash);
                n.scrollTo(i, function () {
                    if (n.options.updateHash && history.pushState) {
                        history.pushState(null, null, r.hash)
                    }
                    n.setTimer();
                    if (typeof n.options.onComplete === "function") {
                        n.options.onComplete()
                    }
                })
            }
        },
        scrollTo: function (e, t) {
            var n = this;
            var r = n.getCoords(e).top;
            var i = false;
            n.$htmlbody.stop().animate({
                scrollTop: r
            }, {
                duration: n.options.speed,
                easing: n.options.easing,
                complete: function () {
                    if (typeof t === "function" && !i) {
                        t()
                    }
                    i = true
                }
            })
        },
        setTimer: function () {
            var e = this;
            e.$window.on("scroll.singlePageNav", function () {
                e.didScroll = true
            });
            e.timer = setInterval(function () {
                if (e.didScroll) {
                    e.didScroll = false;
                    e.checkPosition()
                }
            }, 250)
        },
        clearTimer: function () {
            clearInterval(this.timer);
            this.$window.off("scroll.singlePageNav");
            this.didScroll = false
        },
        checkPosition: function () {
            var e = this.$window.scrollTop();
            var t = this.getCurrentSection(e);
            this.setActiveLink(t)
        },
        getCoords: function (e) {
            return {
                top: Math.round(e.offset().top) - this.options.offset
            }
        },
        setActiveLink: function (e) {
   var t = this.$container.find("a[href$='" + e + "']").parents('li');
            if (!t.hasClass(this.options.currentClass)) {
                this.$links.parents('li').removeClass(this.options.currentClass);
                t.addClass(this.options.currentClass)
            }
        },
        getCurrentSection: function (t) {
            var n, r, i, s;
            for (n = 0; n < this.$links.length; n++) {
                r = this.$links[n].hash;
                if (e(r).length) {
                    i = this.getCoords(e(r));
                    if (t >= i.top - this.options.threshold) {
                        s = r
                    }
                }
            }
            return s || this.$links[0].hash
        }
    };
    e.fn.singlePageNav = function (e) {
        return this.each(function () {
            var t = Object.create(i);
            t.init(e, this)
        })
    };
    e.fn.singlePageNav.defaults = {
        offset: 0,
        threshold: 120,
        speed: 400,
        currentClass: "active",
        easing: "swing",
        updateHash: false,
        filter: "",
        onComplete: false,
        beforeStart: false
    }
})(jQuery, window, document)