/*
 * jQuery One Page Nav Plugin
 * http://github.com/davist11/jQuery-One-Page-Nav
 *
 * Copyright (c) 2010 Trevor Davis (http://trevordavis.net)
 * Dual licensed under the MIT and GPL licenses.
 * Uses the same license as jQuery, see:
 * http://jquery.org/license
 *
 * @version 0.4
 */
(function (a) {
    a.fn.onePageNav = function (b) {
        var c = a.extend({}, a.fn.onePageNav.defaults, b),
            d = {};
        d.sections = {};
        d.bindNav = function (g, k, j, f, h) {
            var i = g.parent(),
                e = g.attr("href"),
                l = a(document);
            if (!i.hasClass(j)) {
                d.adjustNav(k, i, j);
                l.unbind(".onePageNav");
                a.scrollTo(e, h, {
                    onAfter: function () {
                        if (f) {
                            window.location.hash = e
                        }
                        l.bind("scroll.onePageNav", function () {
                            d.scrollChange(k, j)
                        })
                    }
                })
            }
        };
        d.adjustNav = function (g, e, f) {
            g.find("." + f).removeClass(f);
            e.addClass(f)
        };
        d.getPositions = function (e) {
            e.find("a").each(function () {
                var h = a(this).attr("href"),
                    g = a(h).offset(),
                    f = g.left;
                d.sections[h.substr(1)] = Math.round(f)
            })
        };
        d.getSection = function (h) {
            var e = "",
                g = Math.round(a(window).height() / 2);
            for (var f in d.sections) {
                if ((d.sections[f] - g) < h) {
                    e = f
                }
            }
            return e
        };
        d.scrollChange = function (h, g) {
            d.getPositions(h);
            var f = a(window).scrollLeft(),
                e = d.getSection(f);
            if (e !== "") {
                d.adjustNav(h, h.find("a[href=#" + e + "]").parent(), g)
            }
        };
        d.init = function (f, g) {
            f.find("a").bind("click", function (h) {
                d.bindNav(a(this), f, g.currentClass, g.changeHash, g.scrollSpeed);
                h.preventDefault()
            });
            d.getPositions(f);
            var e = false;
            a(document).bind("scroll.onePageNav", function () {
                e = true
            });
            setInterval(function () {
                if (e) {
                    e = false;
                    d.scrollChange(f, g.currentClass)
                }
            }, 250)
        };
        return this.each(function () {
            var e = a(this),
                f = a.meta ? a.extend({}, c, e.data()) : c;
            d.init(e, f)
        })
    };
    a.fn.onePageNav.defaults = {
        currentClass: "current",
        changeHash: false,
        scrollSpeed: 750
    }
})(jQuery);