(function (window, document) {
    "use strict";

    function byId(id) {
        return document.getElementById(id);
    }

    function open(drawerId) {
        var drawer = byId(drawerId);
        var backdrop = byId(drawerId + "_backdrop");
        if (!drawer) { return; }
        drawer.classList.add("is-open");
        drawer.setAttribute("aria-hidden", "false");
        if (backdrop) { backdrop.classList.add("is-open"); }
        document.body.classList.add("sig-pdf-drawer-open");
    }

    function close(drawerId) {
        var drawer = byId(drawerId);
        var backdrop = byId(drawerId + "_backdrop");
        if (!drawer) { return; }
        drawer.classList.remove("is-open");
        drawer.setAttribute("aria-hidden", "true");
        if (backdrop) { backdrop.classList.remove("is-open"); }
        document.body.classList.remove("sig-pdf-drawer-open");
    }

    document.addEventListener("click", function (event) {
        var target = event.target;
        while (target && target !== document) {
            if (target.getAttribute && target.getAttribute("data-sig-pdf-drawer-close")) {
                close(target.getAttribute("data-sig-pdf-drawer-close"));
                return;
            }
            target = target.parentNode;
        }
    });

    document.addEventListener("keydown", function (event) {
        if (event.keyCode !== 27) { return; }
        var drawer = document.querySelector(".sig-pdf-drawer.is-open");
        if (drawer) { close(drawer.id); }
    });


    var drawersOpenBeforeRequest = [];

    function captureOpenDrawers() {
        drawersOpenBeforeRequest = [];

        var drawers = document.querySelectorAll(
            ".sig-pdf-drawer.is-open"
        );

        for (var index = 0; index < drawers.length; index += 1) {
            if (drawers[index].id) {
                drawersOpenBeforeRequest.push(drawers[index].id);
            }
        }
    }

    function restoreOpenDrawers() {
        for (var index = 0; index < drawersOpenBeforeRequest.length; index += 1) {
            open(drawersOpenBeforeRequest[index]);
        }

        drawersOpenBeforeRequest = [];
    }

    function bindPartialPostbackPersistence() {
        if (!window.Sys ||
            !window.Sys.WebForms ||
            !window.Sys.WebForms.PageRequestManager) {
            return;
        }

        var manager =
            window.Sys.WebForms.PageRequestManager.getInstance();

        if (!manager || manager.__sigPdfDrawerBound) {
            return;
        }

        manager.__sigPdfDrawerBound = true;
        manager.add_beginRequest(captureOpenDrawers);
        manager.add_endRequest(restoreOpenDrawers);
    }

    window.SIGPdfDrawer = {
        open: open,
        close: close
    };

    if (window.Sys &&
        window.Sys.Application &&
        typeof window.Sys.Application.add_load === "function") {
        window.Sys.Application.add_load(
            bindPartialPostbackPersistence
        );
    } else if (document.readyState === "loading") {
        document.addEventListener(
            "DOMContentLoaded",
            bindPartialPostbackPersistence
        );
    } else {
        bindPartialPostbackPersistence();
    }
}(window, document));