var Etherpad = (function (my) {
    var etherpadName = null;
    var etherpadIFrame = null;
    var domain = null;
    var options = "?showControls=true&showChat=false&showLineNumbers=true&useMonospaceFont=false";

    /**
     * Initializes the etherpad.
     */
    my.init = function (name) {

        if (config.etherpad_base && !etherpadName) {

            domain = config.etherpad_base;

            if (!name) {
                // In case we're the focus we generate the name.
                etherpadName = Math.random().toString(36).substring(7)
                                + '_' + (new Date().getTime()).toString();
                shareEtherpad();
            }
            else
                etherpadName = name;

            enableEtherpadButton();
        }
    };

    /**
     * Opens/hides the Etherpad.
     */
    my.toggleEtherpad = function (isPresentation) {
        if (!etherpadIFrame)
            createIFrame();

        var largeVideo = null;
        if (Prezi.isPresentationVisible())
            largeVideo = $('#presentation>iframe');
        else
            largeVideo = $('#largeVideo');

        if ($('#etherpad>iframe').css('visibility') === 'hidden') {
            largeVideo.fadeOut(300, function () {
                if (Prezi.isPresentationVisible())
                    largeVideo.css({opacity:'0'});
                else {
                    setLargeVideoVisible(false);
                    dockToolbar(true);
                }

                $('#etherpad>iframe').fadeIn(300, function() {
                    document.body.style.background = '#eeeeee';
                    $('#etherpad>iframe').css({visibility:'visible'});
                    $('#etherpad').css({zIndex:2});
                });
            });
        }
        else if ($('#etherpad>iframe')) {
            $('#etherpad>iframe').fadeOut(300, function () {
                $('#etherpad>iframe').css({visibility:'hidden'});
                $('#etherpad').css({zIndex:0});
                document.body.style.background = 'black';
                if (!isPresentation) {
                    $('#largeVideo').fadeIn(300, function() {
                        setLargeVideoVisible(true);
                        dockToolbar(false);
                    });
                }
            });
        }
        resize();
    };

    /**
     * Resizes the etherpad.
     */
    function resize() {
        if ($('#etherpad>iframe').length) {
            var remoteVideos = $('#remoteVideos');
            var availableHeight
                = window.innerHeight - remoteVideos.outerHeight();
            var availableWidth = Util.getAvailableVideoWidth();

            $('#etherpad>iframe').width(availableWidth);
            $('#etherpad>iframe').height(availableHeight);
        }
    }

    /**
     * Shares the Etherpad name with other participants.
     */
    function shareEtherpad() {
        connection.emuc.addEtherpadToPresence(etherpadName);
        connection.emuc.sendPresence();
    }

    /**
     * Creates the Etherpad button and adds it to the toolbar.
     */
    function enableEtherpadButton() {
        if (!$('#etherpadButton').is(":visible"))
            $('#etherpadButton').css({display:'inline-block'});
    }

    /**
     * Creates the IFrame for the etherpad.
     */
    function createIFrame() {
        etherpadIFrame = document.createElement('iframe');
        etherpadIFrame.src = domain + etherpadName + options;
        etherpadIFrame.frameBorder = 0;
        etherpadIFrame.scrolling = "no";
        etherpadIFrame.width = $('#largeVideoContainer').width() || 640;
        etherpadIFrame.height = $('#largeVideoContainer').height() || 480;
        etherpadIFrame.setAttribute('style', 'visibility: hidden;');

        document.getElementById('etherpad').appendChild(etherpadIFrame);
    }

    /**
     * On Etherpad added to muc.
     */
    $(document).bind('etherpadadded.muc', function (event, jid, etherpadName) {
        console.log("Etherpad added", etherpadName);
        if (config.etherpad_base && !focus) {
            Etherpad.init(etherpadName);
        }
    });

    /**
     * On focus changed event.
     */
    $(document).bind('focusechanged.muc', function (event, focus) {
        console.log("Focus changed");
        if (config.etherpad_base)
            shareEtherpad();
    });

    /**
     * On video selected event.
     */
    $(document).bind('video.selected', function (event, isPresentation) {
        if (!config.etherpad_base)
            return;

        if (etherpadIFrame && etherpadIFrame.style.visibility !== 'hidden')
            Etherpad.toggleEtherpad(isPresentation);
    });

    /**
     * Resizes the etherpad, when the window is resized.
     */
    $(window).resize(function () {
        resize();
    });

    return my;
}(Etherpad || {}));