let lampContainer = document.getElementById("leuchte");
let fillContainer = document.getElementById("fill");
let configInput = document.getElementById("config");
let configLoadError = document.getElementById("config_error");
let configOutput = document.getElementById("config_out");
let ctrlPane = document.getElementById("ctrlPane");
let serialErrorState = document.getElementById("serialState");

const warn = document.getElementById("configWarn");

// Inputs
let input_setup_top = document.getElementById("setup_top");

// Elements
const topElement = document.getElementById("module_top");

const config_ring1 = document.getElementById("ring1Confg");
const config_ring2 = document.getElementById("ring2Confg");
const config_ring3 = document.getElementById("ring3Confg");
const config_ring4 = document.getElementById("ring4Confg");
const config_ring5 = document.getElementById("ring5Confg");

const config_ring_list = [config_ring1, config_ring2, config_ring3, config_ring4, config_ring5];

// Serial port
let port;
const usbVendorId = 0x0403;

// URLs

const urls = {
	rings: {
		red: "res/images/licht_rot.jpg",
		green: "res/images/licht_gruen.jpg",
		blue: "res/images/licht_blau.jpg",
		yellow: "res/images/licht_gelb.jpg",
		white: "res/images/licht_weiss.jpg",
		empty: "",
	},
	extras: {
		top: {
			normal: "res/images/top.jpg",
			buzzer: "res/images/licht_summer.jpg"
		}
	},
	selector: {
		rings: {
			red: "res/images/module_red.jpg",
			green: "res/images/module_green.jpg",
			blue: "res/images/module_blue.jpg",
			yellow: "res/images/module_yellow.jpg",
			white: "res/images/module_white.jpg",
			empty: "res/images/no.png",
		},
		extras: {
			top: {
				normal: "res/images/no.png",
				buzzer: "res/images/module_sounder.jpg"
			}
		}
	}, 
	ctrls: {
		off: "res/images/buttons/Off.png",
		on: "res/images/buttons/On.png",
		alternate1: "res/images/buttons/Alternate1.png",
		alternate2: "res/images/buttons/Alternate2.png"
	}
}

// Attach event listeners
input_setup_top.addEventListener("change", (event) => {
	myConfig.extras.top = event.target.value;
	applyConfig();
});

let myConfig = {
	rings: {
		0: "green",
		1: "yellow",
		2: "red",
		3: "empty",
		4: "empty",
	},
	extras: {
		top: "buzzer"
	}, 
	states: {
		0: 0,
		1: 0,
		2: 0,
		3: 0,
		4: 0,
	}
}

function validateConfig() {
	// Check if there is a "hole" (empty) in the rings 
	// We want to detect ELEMENT EMPTY ELEMENT
	// If the stack is "openended", thats fine
	// Iterate over keys
	let wasEmpty = false;
	for (let i = 0; i < Object.keys(myConfig.rings).length; i++) {
		console.log("Checking ring ", i);
		isNowEmpty = myConfig.rings[i] === "empty";
		if (wasEmpty && !isNowEmpty) {
			warn.innerText = "Invalid config: Empty ring in the middle of the stack!";
			return false;
		}
		console.log("Was empty: ", wasEmpty, " is empty: ", isNowEmpty);
		wasEmpty = myConfig.rings[i] === "empty";

	}

	let amountOfPopulatedRings = 0;
	for (let i = 0; i < Object.keys(myConfig.rings).length; i++) {
		if (myConfig.rings[i] !== "empty") {
			amountOfPopulatedRings++;
		}
	}
	if(amountOfPopulatedRings === 0) {
		warn.innerText = "Invalid config: No rings selected!";
		return false;
	}

	if(amountOfPopulatedRings == 5 && myConfig.extras.top === "buzzer") {
		warn.innerText = "Invalid config: Buzzer selected with all rings!";
		return false;
	}
	
	warn.innerText = "";
	return true;
}

function applyConfig() {
	validateConfig();
	// Remove state from output
	let configCopy = JSON.parse(JSON.stringify(myConfig));
	delete configCopy.states;
	configOutput.innerText = JSON.stringify(configCopy);
	topElement.src = urls.extras.top[myConfig.extras.top];
	
	// Update radio buttons
	for (let i = config_ring_list.length-1; i >= 0; i--) {
		let currElm = config_ring_list[i];
		for (let j = currElm.children.length-1; j >= 0; j--) {
			const child = currElm.children[j];
			if (child.type === "radio") {
				if (child.value === myConfig.rings[i]) {
					child.checked = true;
				}
			}
		}
	}

	// Populate lamp tower
	// Iterate over rings keys
	for (let i = Object.keys(myConfig.rings).length - 1; i >= 0; i--) {
		const ring = myConfig.rings[i];
		let ringElm = document.getElementById("ring" + (i + 1));
		if (!ringElm) {
			ringElm = document.createElement("img");
			ringElm.id = "ring" + (i + 1);
			fillContainer.appendChild(ringElm);
		} else {
			ringElm.src = urls.rings[ring];
		}

		if(myConfig.states[i] == 0) {
			ringElm.classList.remove("is-lit");
			ringElm.classList.remove("is-alternating-1");
			ringElm.classList.remove("is-alternating-2");
		} else if(myConfig.states[i] == 2) {
			ringElm.classList.add("is-alternating-1");
			ringElm.classList.remove("is-alternating-2");
			ringElm.classList.remove("is-lit");
		}else{
			ringElm.classList.add("is-lit");
			ringElm.classList.remove("is-alternating-1");
			ringElm.classList.remove("is-alternating-2");
		}
	}
	setTimeout(() => {
	// Add divs for the controll elements in the same height as the rings
	// But only show for the visible rings
	for (let i = 0; i < Object.keys(myConfig.rings).length; i++) {
		// Get top and bottom y position of the ring from html element

		const ring = myConfig.rings[i];
		let ringElm = document.getElementById("ring" + (i + 1));
		if (ring === "empty") {
			continue;
		}
		console.log("Ring ", i, " is ", ring);
		// output coords
		console.log("Ring ", i, " coords: ", ringElm.getBoundingClientRect());
		console.log(ringElm)
		let ctrlElm = document.getElementById("ctrl" + (i + 1));
		if (!ctrlElm) {
			ctrlElm = document.createElement("div");
			ctrlElm.id = "ctrl" + (i + 1);
			ctrlElm.classList.add("ctrl");
			ctrlPane.appendChild(ctrlElm);
		}
		// Set position by top and bottom of the ring (ignore left and right)
		ctrlElm.style.position = "absolute";
		ctrlElm.style.top = ringElm.getBoundingClientRect().top + "px";
		ctrlElm.style.bottom = ringElm.getBoundingClientRect().bottom + "px";
		ctrlElm.style.width = "250px";

		// Add buttons for the modes (off, on, alternate1, alternate2)
		let actionList = ["off", "on", "alternate1", "alternate2"];
		for (let j = 0; j < actionList.length; j++) {
			let action = actionList[j];
			let actionElm = document.getElementById("action" + (i + 1) + action);
			if (!actionElm) {
				actionElm = document.createElement("button");
				actionElm.id = "action" + (i + 1) + action;
				// actionElm.innerText = action;
				actionElm.style.backgroundImage = `url(${urls.ctrls[action]})`;
				actionElm.style.backgroundSize = "contain";
				actionElm.style.backgroundRepeat = "no-repeat";
				actionElm.classList.add("ctrl-action");
				actionElm.addEventListener("click", () => {
					writeAction(i, action);
				});
				ctrlElm.appendChild(actionElm);
			}
		}




		// ctrlElm.style.left = "0px";
		// ctrlElm.style.right = "0px";
	}
}, 200);

}

function writeAction(ring, state){
	actionToState = {
		"off": 0,
		"on": 1,
		"alternate1": 2,
		"alternate2": 3
	}
	// Check if the ring is empty and check if buzzer is enabled
	if(myConfig.rings[ring] === "empty" && myConfig.extras.top === "buzzer") {
		// Write to buzzer

		return;
	}
	myConfig.states[ring] = actionToState[state];
	applyConfig();
	serial_send();
}

function loadConfig() {
	try {
		let config = JSON.parse(configInput.value);
		// Merge configs, as states is not part of the input
		config.states = myConfig.states;
		myConfig = config;
		applyConfig();
	} catch (error) {
		console.error("Error loading config: ", error);
		configLoadError.innerText = "Error loading config: " + error;
	} finally {
		configLoadError.innerText = "Config loaded!";
	}

	input_setup_top.value = myConfig.extras.top;
	
}

function serial_check_env() {
	if (!navigator.serial) {
		console.error("Serial not supported!");
		serialErrorState.innerText = "Serial not supported in this browser! Try using something chromium based!";
		return false;
	}
	return true;
}

async function serial_connect() {
	if (!serial_check_env()) {
		return;
	}
	navigator.serial.requestPort({ filters: [{ usbVendorId }] }).then((serialPort) => {
		serialPort.open({ baudRate: 9600 });
		port = serialPort;
		serialErrorState.innerText = "Connected to serial port!";
	}).catch((error) => {
		console.error("Error connecting to serial port: ", error);
		serialErrorState.innerText = "Error connecting to serial port: " + error;
	});
}

async function serial_send() {
	if(port && port.writable) {
		let data = `WR${myConfig.states[0]}${myConfig.states[1]}${myConfig.states[2]}${myConfig.states[3]}${myConfig.states[4]}\r`;
		const encoder = new TextEncoder();
		const writer = port.writable.getWriter();
		await writer.write(encoder.encode(data));
		writer.releaseLock();
	}
}

// // Populate config section
// // From urls->selector->rings
// // Show as radio buttons
for (let i = config_ring_list.length-1; i >= 0; i--) {
	let currElm = config_ring_list[i];
	for (const key in urls.selector.rings) {
		if (urls.selector.rings.hasOwnProperty(key)) {
			const url = urls.selector.rings[key];
			let radio = document.createElement("input");
			radio.type = "radio";
			radio.name = "ring" + (i + 1);
			radio.value = key;
			radio.id = "ring" + (i + 1) + key;
			radio.addEventListener("change", (event) => {
				myConfig.rings[i] = event.target.value;
				applyConfig();
			});
			currElm.appendChild(radio);

			let img = document.createElement("img");
			img.src = url;
			img.addEventListener("click", () => {
				radio.checked = true;
				myConfig.rings[i] = key;
				applyConfig();
			}
			);
			currElm.appendChild(img);
		}
	}
}



applyConfig();
setTimeout(() => {
	applyConfig();
}
, 200);