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

const PhilipsHueApi = require('node-hue-api');

class HCMagicHome extends HCColorLamp {
	constructor(config) {
		super(config);

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

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

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

		this._api = new PhilipsHueApi.HueApi(this._configuration.address, this._configuration.username);
		this._lightid = null;

		this._sumanager = new StateUpdateManager(this._state);
	}

	// overwrite to make use of the SUManager
	get state() {
		return this._sumanager.state.clone();
	}

	get effects() {
		return [
			{name: "Color Loop", id: "colorloop"}
		];
	}

	/**
	 * Fetch idmap and resolve uniqueId into a local id
	 */
	init() {
		return this._api.lights().then((resp) => {
			let lights = resp.lights;
			
			for(let l of lights) {
				if (l.uniqueid == this._configuration.uniqueid) {
					this._lightid = l.id;
					break;
				}
			}

			if (this._lightid == null) throw new Error(`Light with unique id "${this._configuration.uniqueid}" was not found on the bridge.`);
		});
	}

	turnOn() {
		let futureState = this.state;
		futureState.on = true;
		let suid = this._sumanager.registerUpdate(futureState);

		let lightState = PhilipsHueApi.lightState.create();
		lightState.on();

		return this._api.setLightState(this._lightid, lightState).then(resolveHelper(this, suid), rejectHelper(this, suid));
	}

	turnOff() {
		let futureState = this.state;
		futureState.on = false;
		let suid = this._sumanager.registerUpdate(futureState);

		let lightState = PhilipsHueApi.lightState.create();
		lightState.off();

		return this._api.setLightState(this._lightid, lightState).then(resolveHelper(this, suid), rejectHelper(this, suid));
	}

	setBrightness(brightness) {
		let futureState = this.state;
		futureState.brightness = brightness;
		let suid = this._sumanager.registerUpdate(futureState);

		let lightState = PhilipsHueApi.lightState.create();
		lightState.bri(brightness * (255 / 100));

		return this._api.setLightState(this._lightid, lightState).then(resolveHelper(this, suid), rejectHelper(this, suid));
	}

	setColor(color) {
		let futureState = this.state;
		futureState.color = fillPartialHSL(color, futureState.color);
		let suid = this._sumanager.registerUpdate(futureState);

		let lightState = PhilipsHueApi.lightState.create();
		let { hue, sat } = convertHSLtoHue(futureState.color.hue, futureState.color.sat, futureState.color.l);
		lightState.hue(hue).sat(sat);		

		return this._api.setLightState(this._lightid, lightState).then(resolveHelper(this, suid), rejectHelper(this, suid));
	}

	setEffect(id) {
		let futureState = this.state;
		futureState.effect = id;
		let suid = this._sumanager.registerUpdate(futureState);

		let lightState = PhilipsHueApi.lightState.create();
		lightState.effect(id);

		return this._api.setLightState(this._lightid, lightState).then(resolveHelper(this, suid), rejectHelper(this, suid));
	}

	pullState() {
		return this._api.lightStatus(this._lightid).then((resp) => {
			let lampstate = resp.state;

			let currentState = this.state;
			let futureState = currentState.clone();

			futureState.on = lampstate.on;
			futureState.color = convertHuetoHSL(lampstate.hue, lampstate.sat);
			futureState.brightness = lampstate.bri * (100/255);
			futureState.effect = lampstate.effect;

			if (currentState.hash != futureState.hash) {
				// the state of the controller has changed externally
				this._sumanager.insertConfirmedState(futureState);
				this.emit("state change", this.state);
			}
		});
	}
}

module.exports = HCMagicHome;

function rejectHelper(self, suid) {
	return (err) => {
		self._sumanager.rejectUpdate(suid);
		throw err; // rethrow so we can catch it at a higher level
	};
}

function resolveHelper(self, suid) {
	return () => {
		self._sumanager.confirmUpdate(suid);

		if (self._sumanager.highestConfirmedId == suid) {
			self.emit("state change", self.state);
		}
	};
}

function fillPartialHSL(newcolor, oldcolor) {
	//console.log(newcolor, oldcolor);
	var color = {};
	color["hue"] = (newcolor.hue != null) ? newcolor.hue : oldcolor.hue;
	color["sat"] = (newcolor.sat != null) ? newcolor.sat : oldcolor.sat;
	color["l"] = (newcolor.l != null) ? newcolor.l : oldcolor.l;
	return color;
}

function convertHSLtoHue(h, s, l) {
	let hue = clamp(h, 0, 360) * (65539 / 360);
	let sat = clamp(s, 0, 100) * (255 / 100);

	return {hue, sat};
}

function convertHuetoHSL(hue, sat) {
	hue = clamp(hue, 0, 65539);
	sat = clamp(sat, 0, 255);

	var h = hue * (360 / 65539);
	var s = sat * (100 / 255);
	var l = 100 - sat * ((100-50) / 255)

	return {hue: Math.round(h), sat: Math.round(s), l: Math.round(l)};
}

function clamp(value, min, max) {
	return Math.min(max, Math.max(min, value));
}