// --- begin, important constants
const data = {
	duration: 1, // will be multiplied by 30
	machine_id: ""
}

const API_URL = "https://backend.laundryweb.altafcreator.com"

// --- check user status
// returns true if there exists a timer, and returns false otherwise.
// cookie need to be included.
async function checkUserStatus() {
	const response = await fetch(`${API_URL}/check`, {
		credentials: "include",
		method: "POST",
	});
	return await response.text();
}

// --- check machine status
// returns a 2d array representing machines
// []: root array
// 	[]: block
//		enum: machine status
async function checkMachineStatus() {
	const response = await fetch(`${API_URL}/status`, {
		method: "POST",
		credentials: "include",
	});
	return await response.json();
}

// --- timer duration
const minField = document.getElementById("min-field");
const decBtn = document.getElementById("decTime");
function increaseTime() {
	data.duration += 1;
	minField.innerText = (30 * data.duration).toString() + " minutes";
	decBtn.disabled = false;
}

function decreaseTime() {
	data.duration -= 1;
	data.duration = Math.max(data.duration, 1);
	if (data.duration == 1) {
		decBtn.disabled = true;
	}
	minField.innerText = (30 * data.duration).toString() + " minutes";
}

// --- starting a timer
function start() {
	fetch(`${API_URL}/start`, {
		credentials: "include",
		method: "POST",
		headers: {
			"Content-Type": "application/json"
		},
		body: JSON.stringify(data)
	}).then(response => response.text())
	.then(data => {
		console.log(data);
		if (data == "all good bro timer started") {
			window.location.href = "/timer/";
		}
	});
}

// --- information loading + cookie setting (from server)
async function information(urlParam = null) {
	const response = fetch(`${API_URL}/info`, {
		credentials: "include",
		method: "POST",
		headers: {
			"Content-Type": "application/json"
		},
		body: JSON.stringify({ "machine_id": urlParam ? urlParam : "" }),
	});

	const block = await response.json()["block"];

	document.getElementById("logo-id").innerText = block;

	return Promise.resolve(block);
}


// ------ page specific -----

// ---- machine status page

const STATUS_INTERVAL = 30

// --- machines visual
async function startUpdateMachines() {
	const urlParams = new URLSearchParams(window.location.search);

	await information(urlParams.get("block"));

	updateMachines();

	while (true) {
		await delay(STATUS_INTERVAL * 1000);

		await updateMachines();
	}
}

async function updateMachines() {
	const dryer1 = document.getElementById("dryer1-img");
	const washer1 = document.getElementById("washer1-img");
	const dryer2 = document.getElementById("dryer2-img");
	const washer2 = document.getElementById("washer2-img");

	const machine_imgs = [dryer1, washer1, dryer2, washer2];

	const dryer1txt = document.getElementById("dryer1-span");
	const washer1txt = document.getElementById("washer1-span");
	const dryer2txt = document.getElementById("dryer2-span");
	const washer2txt = document.getElementById("washer2-span");

	const machine_txts = [dryer1txt, washer1txt, dryer2txt, washer2txt];

	const status = await checkMachineStatus();
	console.log(status);

	for (let i = 0; i < status[0].length; i++) {
		if (status[0][i] == "RUNNING") {
			if ((i + 1) % 2 == 0) {
				machine_imgs[i].src = "/assets/img/washer_on.png";
			} else {
				machine_imgs[i].src = "/assets/img/dryer_on.png";
			}
			const now = Date.now();
			const start = Date.parse(status[1][i]);
			machine_txts[i].innerHTML = Math.ceil(((start + (status[2][i] * 60000)) - now) / 60000).toString() + " min(s) left";
		} else if (status[0][i] == "FINISHED") {
			if ((i + 1) % 2 == 0) {
				machine_imgs[i].src = "/assets/img/washer_clothes.png";
			} else {
				machine_imgs[i].src = "/assets/img/dryer_clothes.png";
			}
			machine_txts[i].innerHTML = "Idle"
		} else {
			if ((i + 1) % 2 == 0) {
				machine_imgs[i].src = "/assets/img/washer_off.png";
			} else {
				machine_imgs[i].src = "/assets/img/dryer_off.png";
			}
			machine_txts[i].innerHTML = "Idle"
		}
	}
}

// --- current timers
async function startLoadTimers() {
	const timersData = await fetchTimers();

	if (timersData[0] != 200) {
		console.error(timersData[0].toString() + " from backend: " + timersData[1]);
		return;
	}

	const timers = timersData[1];

	const container = document.getElementById("timer-container")

	const textList = []
	const progList = []
	const endTimestamps = []
	
	for (let i = 0; i < timers.length; i++) {
		container.innerHTML += `
		<div class="section-container no-pad" id="timer-${timers[i]["id"]}">
			<h1>Timer #${(i + 1).toString()}</h1>
			<div class="machine-container">
				<div class="txtcol-dryer ${timers[i]["machine"] == 1 ? "machine-selected" : ""}">
					<span>Dryer 1</span>
					<img src="/assets/img/dryer_${timers[i]["machine"] == 1 ? "on" : "off"}.png" alt="">
				</div>
				<div class="txtcol-washer ${timers[i]["machine"] == 2 ? "machine-selected" : ""}">
					<span>Washer 1</span>
					<img src="/assets/img/washer_${timers[i]["machine"] == 2 ? "on" : "off"}.png" alt="">
				</div>
				<div class="txtcol-dryer ${timers[i]["machine"] == 3 ? "machine-selected" : ""}">
					<span>Dryer 2</span>
					<img src="/assets/img/dryer_${timers[i]["machine"] == 3 ? "on" : "off"}.png" alt="">
				</div>
				<div class="txtcol-washer ${timers[i]["machine"] == 4 ? "machine-selected" : ""}">
					<span>Washer 2</span>
					<img src="/assets/img/washer_${timers[i]["machine"] == 4 ? "on" : "off"}.png" alt="">
				</div>
			</div>
			<div class="timer-container">
				<span id="timer-txt-${i}">15:00</span>
				<div class="prog-container">
					<div class="prog" id="timer-prog-${i}"></div>
				</div>
			</div>
			<button class="button bg-1" disabled id="timer-btn-${i}">I have collected my laundry!</button>
		</div>
		`

		textList.push(`timer-txt-${i}`);
		progList.push(`timer-prog-${i}`);
		endTimestamps.push(Date.parse(timers[i]["start_time"]) + timers[i]["duration"] * 60000);
	}

	for (let i = 0; i < timers.length; i++) { // html rebuilds everytime innerHTML is modified
		document.getElementById(`timer-btn-${i}`).addEventListener("click", function () {
			finishLaundryTimer(timers[i]["id"]);
		});
		console.log("added!");
	}
	
	console.log(textList);
	console.log(endTimestamps);

	while (true) {
		for (let i = 0; i < textList.length; i++) {
			const text = document.getElementById(textList[i]);
			text.innerText = "";
			const timeRemaining = Math.max(Math.round((endTimestamps[i] - Date.now()) / 1000), 0);
			const hours = Math.floor(timeRemaining / 3600);
			const minutes = Math.floor(timeRemaining / 60);
			const seconds = timeRemaining % 60;
			if (hours > 0) text.innerText += hours.toString().padStart(2, '0') + ':';
			text.innerText += minutes.toString().padStart(2, '0') + ':';
			text.innerText += seconds.toString().padStart(2, '0');
			
			const prog = document.getElementById(progList[i]);
			prog.style.width = ((timeRemaining / (timers[i]["duration"] * 60)) * 100).toString() + "%";

			if (timeRemaining <= 0) {
				document.getElementById(`timer-btn-${i}`).disabled = false;
			}
		}
		await delay(1000);
	}
}

async function fetchTimers() {
	const response = await fetch(`${API_URL}/laundry`, {
		method: "POST",
		credentials: "include",
	});
	return [response.status, await response.json()];
}

// --- finish / collect timer / laundry
async function finishLaundryTimer(timerId) {
	console.log("finishing timer! w/ id "+timerId.toString());
	const response = await fetch(`${API_URL}/finish`, {
		method: "POST",
		credentials: "include",
		headers: {
			"Content-Type": "application/json"
		},
		body: JSON.stringify({id: timerId}),
	});
	if (await response.text() == "laundry finished") {
		window.location.reload();
	}
}

const delay = (durationMs) => {
	return new Promise(resolve => setTimeout(resolve, durationMs));
}