// this will either smooth scroll to an anchor where the `name`
// is the same as the `scroll-to` reference, or to a px height
// (as specified like `scroll-to='0px'`).
var ScrollTo = function () {
    $("[scroll-to]").click(function () {
        var sel = $(this).attr("scroll-to");

        // if the `scroll-to` is a parse-able pixel value like `50px`,
        // then use that as the scrollTop, else assume it is a selector name
        // and find the `offsetTop`.
        var top = /\dpx/.test(sel) ?
                parseInt(sel, 10) :
                $("[name='" + sel + "']").offset().top;

        $("body").animate({ scrollTop: top + "px" }, 300);
    });
};

// these are events that are only to run on the integrations page.
// check if the page location is integrations.
var integration_events = function () {
    $("a.title")
        .addClass("show-integral")
        .prepend($("<span class='integral'>∫</span>"))
        .hover(function () {
            $(".integral").css("display", "inline");
            var width = $(".integral").width();
            $("a.title").css("left", -1 * width);
        },
        function () {
            $(".integral").css("display", "none");
                $("a.title").css("left", 0);
            }
        );

    var $lozenge_icon;
    var currentblock;
    var instructionbox = $("#integration-instruction-block");
    var hashes = $('.integration-instructions').map(function () {
        return this.id || null;
    }).get();


    var show_integration = function (hash) {
        // the version of the hash without the leading "#".
        var _hash = hash.replace(/^#/, "");

        if (hashes.indexOf(_hash) > -1) {
            $lozenge_icon = $(".integration-lozenges .integration-lozenge.integration-" + _hash).clone(true);
            currentblock = $(hash);
            instructionbox.children(".integration-lozenge").replaceWith($lozenge_icon);
            instructionbox.append($lozenge_icon, currentblock);

            $(".inner-content").removeClass("show");
            setTimeout(function () {
                instructionbox.hide();
                $(".integration-lozenges").addClass("hide");
                $(".portico-page-header.extra, .portico-large-text.extra, #integration-main-text").hide();

                instructionbox.append(currentblock);
                instructionbox.show();
                $("#integration-list-link").css("display", "block");

                $(".inner-content").addClass("show");
            }, 300);
            window.scrollTo(0,0);
        }
    };

    function update_hash() {
        var hash = document.location.hash;

        if (hash && hash !== '#hubot-integrations') {
            show_integration(window.location.hash);
        } else if (currentblock && $lozenge_icon) {
            $(".inner-content").removeClass("show");
            setTimeout(function () {
                $("#integration-list-link").css("display", "none");
                $(".integration-lozenges").removeClass("hide");
                $(".portico-page-header.extra, .portico-large-text.extra, #integration-main-text").show();
                instructionbox.hide();
                $lozenge_icon.remove();
                currentblock.appendTo("#integration-instructions-group");
                $(".inner-content").addClass("show");
                $('html, body').animate({scrollTop: ($(hash).offset() || { top: 0 }).top}, 'slow');
            }, 300);
        } else {
            $(".inner-content").addClass("show");
        }
    }

    window.onhashchange = update_hash;
    update_hash();
};

var events = function () {
    ScrollTo();

    $("a").click(function (e) {
        // if the pathname is different than what we are already on, run the
        // custom transition function.
        if (window.location.pathname !== this.pathname && !this.hasAttribute("download")) {
            e.preventDefault();
            $(".portico-landing").removeClass("show");
            setTimeout(function () {
                window.location.href = $(this).attr("href");
            }.bind(this), 500);
        }
    });

    // get the location url like `zulipchat.com/features/`, cut off the trailing
    // `/` and then split by `/` to get ["zulipchat.com", "features"], then
    // pop the last element to get the current section (eg. `features`).
    var location = window.location.href.replace(/\/#*$/, "").split(/\//).pop();

    $("[on-page='" + location + "']").addClass("active");

    $("body").click(function (e) {
        var $e = $(e.target);

        var should_close = !$e.is("ul, #hamburger") && $e.closest("ul, #hamburger").length === 0;

        // this means that it is in mobile sidebar mode.
        if ($("nav ul").height() === window.innerHeight && should_close) {
            $("nav ul").removeClass("show");
        }
    });

    $("#hamburger").click(function () {
        $("nav ul").addClass("show");
    });

    if (/\/integrations\/*/.test(window.location.pathname)) {
        integration_events();
    }
};

// run this callback when the page is determined to have loaded.
var load = function () {
    // show the .portico-landing when the document is loaded.
    setTimeout(function () {
        $(".portico-landing").addClass("show");
    }, 200);

    // display the `x-grad` element a second after load so that the slide up
    // transition on the .portico-landing is nice and smooth.
    setTimeout(function () {
        $("x-grad").addClass("show");
    }, 1000);

    // Set events.
    events();
};

if (document.readyState === "complete") {
    load();
} else {
    $(document).ready(load);
}