const Gpio = require("pigpio").Gpio;
const schedule = require("./schedule.json");
const HZ = 10000;

let ledRed = new Gpio(18, {mode: Gpio.OUTPUT});
let ledGreen = new Gpio(12, {mode: Gpio.OUTPUT});

let timings = schedule.times.reduce((result, time)  => {
	result.push({start: time.time, color: time.color});
	return result;
}, []).sort((a, b) => a.start - b.start).map((timing, i, arr) => {
	timing.end = arr[(i+1) % arr.length].start;
	return timing;
});

splitAtMidnight(timings);

let state = {
	color: "red"
}

let updateState = setInterval(() => {
	let time = getTime();
	let timing = timings.find(x => x.start <= time && x.end > time);
	if(timing.color !== state.color) {
		state = {
			color: timing.color
		};
	}
}, 1000);

let render = setInterval(() => {
	switch(state.color) {
		case "red":
			if(ledGreen.digitalRead()) {
				return ledGreen.digitalWrite(0);
			}
			return ledRed.hardwarePwmWrite(HZ, getBrightness(Date.now()));
			break;
		case "green":
			if(ledRed.digitalRead()) {
				return ledRed.digitalWrite(0);
			}
			return ledGreen.hardwarePwmWrite(HZ, getBrightness(Date.now()));
			break;
	}
}, 50);

function getBrightness(x) {
	return Math.floor(breathingCurve(x, 3000, 1000000, 100000));
}

function breathingCurve(x, interval = 3000, max, min) {
	let t = (x)/interval;
	let y = (Math.sin(t) + 1)/2;
	return ((max-min) * y) + min;
}

function splitAtMidnight(arr) {
	let last = arr[arr.length -1];
	arr.unshift({ ...last, start: 0});
	arr[arr.length - 1].end = 0;
}

function getTime() {
	let date = new Date(Date.now());
	return (date.getHours() * 100) + date.getMinutes() + 1
}