IKEA Tradfri Remote

// This function is for use in Node-Red within Home Assistant for the IKEA
// Trafdri Remote Control. The function can turn on/off a light (or group of
// lights), adjust the brightness (in stepped increments), and cycle through
// defined colors (white, red, green, and blue).

// Usage: An Events: All node with an Event Type of zha_event is used to handle
// the events. It is connected to a Switch node with a Property of
// msg.payload.event.device_ieee. The outputs correspond to the device_ieee of
// the remote being used. This allows for multiple remotes to use different
// functions. The output is connected to this Function node. Multiple outputs
// can be connected to this function. The output is connected to an empty
// Service Call node.

// The function requires an entity to be defined. A group defined in Home
// Assistant can also be used to control multiple lights simultaneously. If you
// want to use this function with only one bulb, enter its entity name in both
// entity and entity_group.
var entity = "light.living_room1";
var entity_group = "light.living_room_lights";
// Define your desired color temperature when the light cycles back to white
var color_temp = 154;
// Define the colors to cycle through using RGB format.
const color_options = ['255,255,255','0,0,255','255,0,0','0,255,0']

// ======
// This function helps prevent multiple entities within a group from being
// out-of-sync with the other entities. If any entities within the group are on,
// the group itself will be on and, therefore, the turn_off service will be
// called in the following call service node. This is more effective than
// relying on a toggle service.

var button_pressed = msg.payload.event.command
var left_right_button_pressed = msg.payload.event.args[0]
var state = global.get('homeassistant').homeAssistant.states[entity_group].state;

// Establish standard payload to be passed to service call node
msg.payload = {domain: "light", service: "turn_on",
    data: {
        entity_id: entity_group,
        transition: 1, }
    };

if (button_pressed === "checkin") { return }
if (button_pressed === "on_with_timed_off") { return }

if (button_pressed === "toggle") {
    if (state === "off") { msg.payload.service = "turn_on" }
    if (state === "on") { msg.payload.service = "turn_off" }
}

if (button_pressed === "step_with_on_off" || button_pressed === "step") {
    var brightness = global.get('homeassistant').homeAssistant.states[entity].attributes.brightness;
    brightness = parseInt(brightness);

    if (button_pressed == "step_with_on_off") { //Brightness Up pressed
        if (brightness < 204) {
            brightness = brightness + 50;
        } else {
            brightness = 255;
        }
    }

    if (button_pressed == "step") { //Brightness Down pressed
        if (brightness > 51) {
            brightness = brightness - 50;
        } else {
        brightness = 1;
        }
    }
    msg.payload.data.brightness = brightness.toString();
}

if (button_pressed === "press") {
    // This section uses an older revision of the code where strings were
    // evaluated and used instead of objects. I was unable to figure out how to
    // make this section work using objects so it is still using the older
    // string format.
    var rgb_in = [], rgb_out = []
    //const color_options = ['255,255,255','0,0,255','255,0,0','0,255,0']
    //const color_options = [[255,255,255],[0,0,255],[255,0,0],[0,255,0]];

    //Determines if the light is running in color_temp mode or RGB.
    //Color_temp will not have RGB associated with it even though it is
    //white is [255,255,255].
    const d = global.get('homeassistant').homeAssistant.states[entity].attributes
    if (d.rgb_color != null) {
        rgb_in = d.rgb_color.toString();
        //rgb_in = d.rgb_color;
    } else {
        rgb_in = "255,255,255";
        //rgb_in = [255,255,255];
    }

    //Finds the current RGB in the color_options array and determines which RGB
    //will be displayed next depending on advancing in the array or stepping
    //backwards.
    var key = color_options.indexOf(rgb_in)
    if (key == -1) { key = 0; } //If RGB not found in color_options, set to 0
    if (left_right_button_pressed == 256) { //Right button pressed (257 = Left)
        direction = 1
    } else {
        direction = -1
    }

    //Provides 'loop around' functionality for the array
    new_key = (key + direction) % color_options.length
    if (new_key == -1) { new_key = color_options.length - 1; }
    rgb_out = color_options[new_key];

    //Generates the msg.payload with the new RGB or sets the color to white with
    //color_temp setting.
    if (rgb_out == '255,255,255') {
    //if (rgb_out == [255,255,255]) {
        msg.payload.data.color_temp = color_temp;
    } else {
        //Recent NR/HA update broke sending the rgb_color as a string. Call
        //service node wanted an object. This RegEx fixed the problem without
        //having to re-write the entire RGB changing section, which still
        //needs to be done at some point.
        msg.payload.data.rgb_color = rgb_out.replace(/[^\d,]/g, '').split(',');
        //msg.payload.data.rgb_color = [rgb_out];
    }
}

return msg;