(function() {
    // Notes from http://news.ycombinator.com/item?id=1952531
    var notes = {
        "suspended cymbal":"zk",
        "snare":"bschk",
        "brush":"pv",
        "bass":"bk",
        "flam1":"tk",
        "roll tap":"vk",
        "flam2":"kt",
        "flam tap":"kttp",
        "hi hat tap":"krp",
        "short roll":"pv",
        "better hi hat":"th",
        "instant rimshot":"thp, ds"
    };

    function clickListen() {
        var e = document.createEvent('MouseEvents');
        e.initMouseEvent("click", true, true, window, 1, 12, 345, 7, 220, false, false, true, false, 0, null );
        document.getElementsByClassName("gt-icon-listen-off")[0].dispatchEvent(e);
    }

    function playNote(event) {
        var source = document.getElementById("source");
        if (source.value === event.target.note) {
            clickListen();
            return;
        }

        source.value = event.target.note;
        var state = 0;
        var result_box = document.getElementById("result_box");
        var timer = window.setInterval(function() {
            if (state === 0 && result_box.childNodes[1] && result_box.childNodes[1].data === "...") {
                state = 1;
            } else if (state === 1 && (!result_box.childNodes[1] || !result_box.childNodes[1].data)) {
                clickListen();
                window.clearInterval(timer);
            }
        });
    }

    for (var name in notes) {
        if (notes.hasOwnProperty(name)) {
            var button = document.createElement("input");
            button.type = "button";
            button.value = name;
            button.note = notes[name];
            button.onclick = playNote;
            document.body.appendChild(button);
        }
    }
})();