const {
	HCColorLamp,
	StateUpdateManager,
	utils,
} = require('homecontrol-control-base');

class HCMHAddressableSubsection extends HCColorLamp {
	constructor(config, registry) {
		super(config);

		if (!("parent" in this._configuration)) {
			throw new Error(`Required configuration field "parent" is missing"`);
		}
		if (!("section_id" in this._configuration)) {
			throw new Error(`Required configuration field "section_id" is missing"`);
		}
		if (!("section_start" in this._configuration)) {
			throw new Error(`Required configuration field "section_start" is missing"`);
		}
		if (!("section_end" in this._configuration)) {
			throw new Error(`Required configuration field "section_end" is missing"`);
		}

		this._registry = registry;
		this._parent = null;

		// the default state should be white and 100% brightness
		this._state.brightness = 100;
		this._state.color.l = 100;
	}

	async init() {
		for (let i = 0; i < 20; i++) {
			if (this._configuration.parent in this._registry) {
				this._parent = this._registry[this._configuration.parent];

				this._parent.on("state change", state => {
					this.pullState();
				});

				return;
			} else {
				await utils.asyncTimeout(100);
			}
		}

		throw new Error("Could not connect to parent after 2 seconds");
	}

	turnOn() {
		let { red, green, blue } = utils.HSL_to_RGB(this.state.color);

		red = Math.round(red * this.state.brightness / 100);
        green = Math.round(green * this.state.brightness / 100);
        blue = Math.round(blue * this.state.brightness / 100);

		this._state.on = true;
		this.emit("state change", this.state);

		return this._parent.setSubsectionColor(
			this._configuration.section_start, 
			this._configuration.section_end, 
			this._configuration.section_id,
			{ red, green, blue }
		);
	}

	turnOff() {
		this._state.on = false;
		this.emit("state change", this.state);
		return this._parent.removeSubsection(this._configuration.section_id);
	}

	setColor(color) {
		this._state.color = utils.fillPartialHSL(color, this._state.color);

		return this.turnOn();
	}

	setBrightness(brightness) {
		this._state.brightness = brightness;

		return this.turnOn();
	}

	pullState() {
		if (this._parent == null) return Promise.resolve();

		const futureState = this.state;

		futureState.on = this._parent.isSubsectionActive(this._configuration.section_id);

		if (this.state.hash != futureState.hash) {
			this._state = futureState;
			this.emit("state change", futureState);
		}

		return Promise.resolve();
	}
}

module.exports = HCMHAddressableSubsection;