let canvas;
let context;

let username = localStorage.getItem("username");
let userData = {
	name: "",
	coordinates: { x: 0, y: 0 },
	inventory: [],
	position: { x: 0.5, y: 0.5 },
	size: {
		width: 0.03,
		height: 0.07
	},
	speed: 0.005,
	sprite: 'medievalUnit_01.png'
};

let lockUserMovement = false;

let loadingDelayTimeout;
let showLoadingMessage;

let otherPlayerCache = {};
let otherPlayers = {};

let roomData = { name: "", walls: [], tiles: [], decals: [] };

let keys = [];
let sendMovement = false;
let userChanged = false;

let atlas = new SpriteAtlas('assets', 'medievalRTS_spritesheet@2.xml');

const apidataurl = `http://jsonapi.eyeofmidas.net/data`;
//const websocketurl = `ws://${location.host}/ws`;
const websocketurl = `ws://jsonapi.eyeofmidas.net:8080`;
let webSocket;

function ajaxGet(url) {
	return new Promise((resolve, reject) => {
		var r = new XMLHttpRequest();
		r.open("GET", url, true);
		r.onreadystatechange = function (response) {
			if (r.readyState == 4 && r.status == 200) {
				resolve(JSON.parse(r.responseText));
			}
			if (r.readyState == 4 && r.status != 200) {
				reject(JSON.parse(r.response));
			}
			return;
		}
		r.onerror = function (response) {
			console.error("onerror", response, r);
			reject(r.responseText);
		}
		r.setRequestHeader("Content-Type", "application/json");
		r.send();
	});
}

function ajaxPost(url, data) {
	return new Promise((resolve, reject) => {
		var r = new XMLHttpRequest();
		r.open("POST", url, true);
		r.onreadystatechange = function (response) {
			if (r.readyState == 4 && r.status == 200) {
				resolve(JSON.parse(r.responseText));
			}
			if (r.readyState == 4 && r.status != 200) {
				reject(r.responseText);
			}
			return;
		}
		r.onerror = function (response) {
			reject(r.responseText);
		}
		r.setRequestHeader("Content-Type", "application/json");
		let jsonData = JSON.stringify(data);
		r.send(jsonData);
	});
}

function websocketSafeSend(message) {
	//console.log("%c" + message, "color: #22FF22");
	try {
		webSocket.send(message);
	} catch (error) {
		console.error("websocket", error);
	}
}

function handleMessage(message) {
	//console.log("%c" + message, "color: #FF2222");
	splitMessage = message.split(" ");
	switch (splitMessage[0]) {
		case "join":
			addOtherPlayer(splitMessage[1], splitMessage[2], splitMessage[3]);
			break;
		case "leave":
			removeOtherPlayer(splitMessage[1]);
			break;
		case "move":
			moveOtherPlayer(splitMessage[1], splitMessage[2], splitMessage[3]);
			break;
		case "population":
			splitMessage.shift();
			setRoomPopulation(splitMessage);
			break;
		default:
			console.log(message);
			break;
	}
}

async function getPlayerData(playerKey) {
	if (otherPlayerCache[playerKey]) {
		return otherPlayerCache[playerKey];
	}
	let result = await ajaxGet(`${apidataurl}/${playerKey}`);
	otherPlayerCache[playerKey] = result;
	return otherPlayerCache[playerKey];
}

function addOtherPlayer(playerKey, x, y) {
	let cleanName = userData.name.replace(/\s/g, '');
	if (playerKey == `user-${cleanName}` || playerKey == "") {
		return;
	}
	otherPlayers[playerKey] = { name: "", position: { x: x, y: y }, size: { width: 0.0125, height: 0.0167 }, sprite: 'medievalUnit_01.png' };
	getPlayerData(playerKey).then((response) => {
		otherPlayers[playerKey].name = response.name;
		otherPlayers[playerKey].size.width = response.size.width;
		otherPlayers[playerKey].size.height = response.size.height;
		otherPlayers[playerKey].sprite = response.sprite;
		//TODO: populate other data
	});
}

function removeOtherPlayer(playerKey) {
	let cleanName = userData.name.replace(/\s/g, '');
	if (playerKey == `user-${cleanName}`) {
		return;
	}
	delete otherPlayers[playerKey];
}

function moveOtherPlayer(playerKey, x, y) {
	let cleanName = userData.name.replace(/\s/g, '');
	if (playerKey == `user-${cleanName}`) {
		return;
	}
	if (!otherPlayers[playerKey]) {
		addOtherPlayer(playerKey, x, y);
	}
	otherPlayers[playerKey].position.x = parseFloat(x);
	otherPlayers[playerKey].position.y = parseFloat(y);
}

function setRoomPopulation(otherUserData) {
	for (let i = 0; i < otherUserData.length; i += 3) {
		addOtherPlayer(otherUserData[i], otherUserData[i + 1], otherUserData[i + 2]);
	}
}

document.addEventListener("DOMContentLoaded", () => {
	for (let i = 0; i < 256; i++) {
		keys[i] = false;
	}
	canvas = document.getElementsByTagName("canvas")[0];
	context = canvas.getContext("2d");
	context.canvas.width = canvas.clientWidth;
	context.canvas.height = canvas.clientHeight;

	atlas.load().then(() => {
		animateLoop();

		getRoom(0, 0);

		webSocket = new WebSocket(websocketurl);
		webSocket.onmessage = function (event) {
			handleMessage(event.data);
		}
		webSocket.onopen = function (event) {
		}


		if (!username) {
			username = prompt("Please enter your username");
		}
		if (!username) {
			return;
		}
		let cleanName = username.replace(/\s/g, '');
		ajaxGet(`${apidataurl}/user-${cleanName}`).then(result => {
			userData = result;
			localStorage.setItem("username", cleanName);
			getRoom(userData.coordinates.x, userData.coordinates.y);
		}, (error) => {
			if (error.errorCode == 404) {
				userData.name = username;
				let create = confirm("Would you like to create the new user '" + userData.name + "'?");
				if (!create) {
					localStorage.removeItem("username");
					return;
				}
				let validStartingUnits = [
					'medievalUnit_01.png',
					// 'medievalUnit_02.png',
					// 'medievalUnit_03.png',
					// 'medievalUnit_04.png',
					// 'medievalUnit_05.png',
					'medievalUnit_06.png',
					'medievalUnit_07.png',
					// 'medievalUnit_08.png',
					// 'medievalUnit_09.png',
					// 'medievalUnit_10.png',
					// 'medievalUnit_11.png',
					'medievalUnit_12.png',
					'medievalUnit_13.png',
					// 'medievalUnit_14.png',
					// 'medievalUnit_15.png',
					// 'medievalUnit_16.png',
					// 'medievalUnit_17.png',
					'medievalUnit_18.png',
					'medievalUnit_19.png',
					// 'medievalUnit_20.png',
					// 'medievalUnit_21.png',
					// 'medievalUnit_22.png',
					// 'medievalUnit_23.png',
					'medievalUnit_24.png',
				];
				userData.sprite = validStartingUnits[Math.floor(validStartingUnits.length * Math.random())];
				saveUser().then(() => {
					localStorage.setItem("username", cleanName);
					getRoom(userData.coordinates.x, userData.coordinates.y);
				});
			} else {
				console.error(error);
			}
		});
	});
});

let delta = { x: 0, y: 0 };

function draw(context) {
	delta.x = 0;
	delta.y = 0;
	if (keys[38] || keys[87]) {
		delta.y = -userData.speed;
		sendMovement = true;
	}
	if (keys[37] || keys[65]) {
		delta.x = -userData.speed;
		sendMovement = true;
	}
	if (keys[40] || keys[83]) {
		delta.y = userData.speed;
		sendMovement = true;
	}
	if (keys[39] || keys[68]) {
		delta.x = +userData.speed;
		sendMovement = true;
	}

	let userCurrentBounds = {
		x: userData.position.x,
		y: userData.position.y,
		width: userData.size.width,
		height: userData.size.height,
	};

	let userFutureBounds = {
		x: userData.position.x + delta.x,
		y: userData.position.y + delta.y,
		width: userData.size.width,
		height: userData.size.height,
	};
	for (let i = 0; i < roomData.walls.length; i++) {
		let wall = roomData.walls[i];
		if (boxCollision(wall, userFutureBounds) && !boxCollision(wall, userCurrentBounds)) {
			let userFutureBoundsY = {
				x: userData.position.x,
				y: userData.position.y + delta.y,
				width: userData.size.width,
				height: userData.size.height,
			};
			let userFutureBoundsX = {
				x: userData.position.x + delta.x,
				y: userData.position.y,
				width: userData.size.width,
				height: userData.size.height,
			};

			if (boxCollision(wall, userFutureBoundsX)) {
				delta.x = 0;
			}
			if (boxCollision(wall, userFutureBoundsY)) {
				delta.y = 0;
			}

			if (delta.x == 0 && delta.y == 0) {
				sendMovement = false;
			}
		}
	}

	if (!lockUserMovement) {
		userData.position.x += delta.x;
		userData.position.y += delta.y;
		if (userData.position.x * canvas.width > canvas.width) {
			lockUserMovement = true;
			loadingDelayTimeout = setTimeout(() => { showLoadingMessage = true; }, 50);
			getRoom(userData.coordinates.x + 1, userData.coordinates.y).then(() => {
				userData.position.x = 0;
				userData.coordinates.x++;
				saveUser();
				lockUserMovement = false;
			});
		}
		if (userData.position.x * canvas.width < -userData.size.width) {
			lockUserMovement = true;
			loadingDelayTimeout = setTimeout(() => { showLoadingMessage = true; }, 50);
			getRoom(userData.coordinates.x - 1, userData.coordinates.y).then(() => {
				userData.position.x = 1 - userData.size.width;
				userData.coordinates.x--;
				saveUser();
				lockUserMovement = false;
			});
		}

		if (userData.position.y * canvas.height > canvas.height) {
			lockUserMovement = true;
			loadingDelayTimeout = setTimeout(() => { showLoadingMessage = true; }, 50);
			getRoom(userData.coordinates.x, userData.coordinates.y + 1).then(() => {
				userData.position.y = 0;
				userData.coordinates.y++;
				saveUser();
				lockUserMovement = false;
			});
		}
		if (userData.position.y * canvas.height < -userData.size.height) {
			lockUserMovement = true;
			loadingDelayTimeout = setTimeout(() => { showLoadingMessage = true; }, 50);
			getRoom(userData.coordinates.x, userData.coordinates.y - 1).then(() => {
				userData.position.y = 1 - userData.size.height;
				userData.coordinates.y--;
				saveUser();
				lockUserMovement = false;
			});
		}
	}

	context.save();
	context.translate(-0.5, -0.5);
	drawRoom(context);
	drawOtherPlayers(context);
	drawPlayer(context);

	if (showLoadingMessage) {
		context.font = "30px Arial";
		context.textAlign = "center";
		context.fillStyle = "#FFFFFF";
		context.fillText("Loading... please wait", 0.5 * canvas.width, 0.5 * canvas.height);
	} else {
		clearTimeout(loadingDelayTimeout);
		showLoadingMessage = false;
	}

	context.restore();

	if (drawEditor != undefined) {
		drawEditor(context);
	}
}

function boxCollision(box1, box2) {
	return box1.x < box2.x + box2.width &&
		box1.x + box1.width > box2.x &&
		box1.y < box2.y + box2.height &&
		box1.y + box1.height > box2.y;
}

function pointCollision(box, point) {
	return box.x < point.x && box.x + box.width > point.x &&
		box.y < point.y && box.y + box.height > point.y;
}

async function saveUser() {
	if (!userData.name) {
		return;
	}
	let cleanName = userData.name.replace(/\s/g, '');
	let result = await ajaxPost(`${apidataurl}/user-${cleanName}`, userData);
	userData = result;
}

async function getRoom(x, y) {
	try {
		let result = await ajaxGet(`${apidataurl}/room-${x},${y}`);
		roomData.name = result.name ?? "";
		roomData.walls = result.walls ?? [];
		roomData.tiles = result.tiles ?? [];
		roomData.decals = result.decals ?? [];
	} catch (error) {
		let emptyRoom = { name: `${x},${y}`, walls: [], tiles: [], decals: [] };
		addRandomTiles(emptyRoom);
		let result = await ajaxPost(`${apidataurl}/room-${x},${y}`, emptyRoom);
		roomData = result;
	}
	let cleanName = userData.name.replace(/\s/g, '');
	otherPlayers = {};
	if (userData.name) {
		websocketSafeSend(`subscribe user-${cleanName} room-${x},${y} ${userData.position.x} ${userData.position.y}`);
	}
}

const colors = [
	"red",
	"green",
	"blue",
	"black",
	"purple",
	"orange"
];
function addRandomItems(room) {
	let items = [];
	for (let i = Math.floor(10 * Math.random()); i > 0; i--) {
		let newitem = { coordinates: { x: Math.random(), y: Math.random() }, color: colors[Math.floor(colors.length * Math.random())] };
		items.push(newitem);
	}

	room.items = items;
}

function addRandomTiles(room) {
	let tileSize = 8 * 5;

	room.tiles = [];
	for (let i = 0; i < tileSize; i++) {
		room.tiles.push(57 + (Math.floor(2 * Math.random())));
	}
}

function drawPlayer(context) {
	context.font = "14px Arial";
	context.textAlign = "center";

	let pos = inScreenSpace(userData.position);
	let size = inScreenSize(userData.size);

	let centerPos = { x: pos.x + (size.width / 2), y: pos.y + (size.height / 2) };

	atlas.drawCentered(context, userData.sprite, centerPos);

	context.fillStyle = "#000000";
	context.fillText(userData.name, centerPos.x - 1, (pos.y - 0.02 * canvas.height) - 1);
	context.fillText(userData.name, centerPos.x + 1, (pos.y - 0.02 * canvas.height) - 1);
	context.fillText(userData.name, centerPos.x - 1, (pos.y - 0.02 * canvas.height) + 1);
	context.fillText(userData.name, centerPos.x + 1, (pos.y - 0.02 * canvas.height) + 1);

	context.fillStyle = "#FFFFFF";
	context.fillText(userData.name, centerPos.x, pos.y - 0.02 * canvas.height);
}

function inScreenSpace(serverPosition) {
	return { x: serverPosition.x * canvas.width, y: serverPosition.y * canvas.height };
}

function inScreenSize(serverSize) {
	return { width: serverSize.width * canvas.width, height: serverSize.height * canvas.height };
}

function drawOtherPlayers(context) {
	context.font = "14px Arial";
	context.textAlign = "center";

	for (let index in otherPlayers) {
		let player = otherPlayers[index];


		let pos = inScreenSpace(player.position);
		let size = inScreenSize(player.size);

		let centerPos = { x: pos.x + (size.width / 2), y: pos.y + (size.height / 2) };

		atlas.drawCentered(context, player.sprite, centerPos);

		context.fillStyle = "#000000";
		context.fillText(player.name, centerPos.x - 1, (pos.y - 0.02 * canvas.height) - 1);
		context.fillText(player.name, centerPos.x + 1, (pos.y - 0.02 * canvas.height) - 1);
		context.fillText(player.name, centerPos.x - 1, (pos.y - 0.02 * canvas.height) + 1);
		context.fillText(player.name, centerPos.x + 1, (pos.y - 0.02 * canvas.height) + 1);

		context.fillStyle = "#FFFFFF";
		context.fillText(player.name, centerPos.x, pos.y - 0.02 * canvas.height);
	}

}

function drawRoom(context) {
	let width = 126;
	let height = 126;

	for (var i = 0; i < roomData.tiles.length; i++) {
		let tile = roomData.tiles[i];
		try {
			atlas.getSprite(tile);
			atlas.draw(context, tile, { x: ((i % 8) * width), y: (Math.floor(i / 8) * height) });
		} catch (e) {}
		
		if (tile < 10) {
			tile = "0" + tile;
		}
		let tileName = `medievalTile_${tile}.png`;

		try {
			atlas.getSprite(tileName);
			atlas.draw(context, tileName, { x: ((i % 8) * width), y: (Math.floor(i / 8) * height) });
		} catch (e) {
			// console.error("Room data error: tile index ", i, " is not defined");
			continue;
		}
	}

	// for (var i = 0; i < roomData.items.length; i++) {
	// 	let item = roomData.items[i];
	// 	context.beginPath();
	// 	context.strokeStyle = item.color;
	// 	context.rect(item.coordinates.x * canvas.width, item.coordinates.y * canvas.height, 10, 10);
	// 	context.stroke();
	// }


	// for (var i = 0; i < roomData.walls.length; i++) {
	// 	let wall = roomData.walls[i];
	// 	context.beginPath();
	// 	context.strokeStyle = wall.color ?? "red";
	// 	context.rect(wall.x * canvas.width, wall.y * canvas.height, wall.width * canvas.width, wall.height * canvas.height);
	// 	context.stroke();
	// }

	for (var i = 0; i < roomData.decals.length; i++) {
		let decal = roomData.decals[i];
		atlas.draw(context, decal.spriteName, { x: decal.x * canvas.width, y: decal.y * canvas.height });
	}

	context.font = "30px Arial";
	context.fillText(roomData.name, 20, 40);
}

function animateLoop() {
	canvas.width = canvas.width;
	draw(context);
	window.requestAnimationFrame(animateLoop);
}

document.addEventListener("keydown", event => {
	keys[event.keyCode] = true;
});

document.addEventListener("keyup", event => {
	keys[event.keyCode] = false;
});

setInterval(() => {
	if (!sendMovement) {
		return;
	}
	userChanged = true;
	sendMovement = false;
	let cleanName = userData.name.replace(/\s/g, '');
	websocketSafeSend(`move user-${cleanName} ${userData.position.x} ${userData.position.y}`);
}, Math.floor(1000 / 30));

setInterval(() => {
	if (!userChanged) {
		return;
	}
	saveUser();
	userChanged = false;
}, Math.floor(60000));