loadAPI(18);

// Remove this if you want to be able to use deprecated methods without causing script to stop.
// This is useful during development.
host.setShouldFailOnDeprecatedUse(true);

host.defineController("Generic", "PC2Scene", "0.1", "d8fd1407-e713-4c83-8ed1-1532c05895ba", "decibyte");
host.defineMidiPorts(1, 0);


function init() {
    // Set up the preferences for the controller script. There are 2 available
    // settings:
    // - The MIDI channel to listen for Program Change messages on.
    // - Whether to show Scene changes as notifications on the screen.
    preferences = host.getPreferences();
    midiChannel = preferences.getNumberSetting("MIDI channel for Program Change", "General", 1, 16, 1, "", 1);
    showNotifications = preferences.getBooleanSetting("Show scene change notifications", "General", false);

    // Attach a callback to incoming MIDI events.
    midiIn = host.getMidiInPort(0);
    midiIn.setMidiCallback(onMidiIn);

    // Set up a Scene bank and iterate over all of them, in order to mark
    // their names interesting (to be able to print them later on).
    sceneCount = 128;
    scenes = host.createSceneBank(sceneCount);
    for (i = 0; i < sceneCount; i++) {
        scene = scenes.getScene(i);
        scene.name().markInterested();
    }

    host.println("PC2Scene initialized.");
}

function flush() {
}

function exit() {
    host.println("Exited.");
}

function onMidiIn(status, data1, data2) {
    // Only look at Program Change messages.
    if (isProgramChange(status)) {
        // Get the MIDI channel for the incoming Program Change message and
        // the MIDI channel from the preferences.
        inChannel = MIDIChannel(status);
        prefChannel = midiChannel.get() * 15;

        // Only change Scene if the Program Change message is from the
        // correct channel.
        if (inChannel == prefChannel) {
            // Get the Scene, launch it and scroll to it.
            scene = scenes.getScene(data1);
            scene.launch();
            scenes.scrollIntoView(data1);

            // Print out debug information and optionally show the name of the
            // new Scene if toggled on in the preferences.
            sceneName = scene.name().get();
            host.println("Program Change " + data1 +  " received  on channel " + (MIDIChannel(status) + 1));
            message = 'Launching scene: "' + sceneName + '"';
            if (showNotifications.get()) {
                host.showPopupNotification(message);
            }
            host.println(message);
        }
    }
}