(function () {

    // don't emit events from inside the previews themselves
    if (window.location.search.match(/receiver/gi)) {
        return;
    }

    var socket = io.connect(window.location.origin),
        socketId = Math.random().toString().slice(2);

    console.log('View slide notes at ' + window.location.origin + '/notes/' + socketId);

    window.open(window.location.origin + '/notes/' + socketId, 'notes-' + socketId);

    /**
     * Posts the current slide data to the notes window
     */
    function post() {

        var slideElement = Reveal.getCurrentSlide(),
            notesElement = slideElement.querySelector('aside.notes');

        var messageData = {
            notes: '',
            markdown: false,
            socketId: socketId,
            state: Reveal.getState()
        };

        // Look for notes defined in a slide attribute
        if (slideElement.hasAttribute('data-notes')) {
            messageData.notes = slideElement.getAttribute('data-notes');
        }

        // Look for notes defined in an aside element
        if (notesElement) {
            messageData.notes = notesElement.innerHTML;
            messageData.markdown = typeof notesElement.getAttribute('data-markdown') === 'string';
        }

        socket.emit('statechanged', messageData);

    }

    // When a new notes window connects, post our current state
    socket.on('new-subscriber', function (data) {
        post();
    });

    // When the state changes from inside of the speaker view
    socket.on('statechanged-speaker', function (data) {
        Reveal.setState(data.state);
    });

    // Monitor events that trigger a change in state
    Reveal.addEventListener('slidechanged', post);
    Reveal.addEventListener('fragmentshown', post);
    Reveal.addEventListener('fragmenthidden', post);
    Reveal.addEventListener('overviewhidden', post);
    Reveal.addEventListener('overviewshown', post);
    Reveal.addEventListener('paused', post);
    Reveal.addEventListener('resumed', post);

    // Post the initial state
    post();

}());