const ctx = canvas.getContext('2d');
const canvasLeft = canvas.offsetLeft + canvas.clientLeft;
const canvasTop = canvas.offsetTop + canvas.clientTop;

const cardWidth = 80;
const cardHeight = 120;

const cards = new Image();
const back = new Image();

let clickableItems = [];
// Make all clickableItems sit in the same clickableItems array
// Not needed in a child, as loops will be on arrays below
clickableItems['board'] = [];
clickableItems['hand'] = [];
clickableItems['opponentHand'] = [];

// TODO: Uniform the arrays to player and opponent/different playesr
let playerHand =	[];
let opponentHand =	[];
let playerBoard =	[];
let opponentBoard =	[];
let playerDeck = 	[];
let opponentDeck =	[];
let playerShield =	[];
let opponentShield =	[];

let deckCount = 60;
let deckCountOpponent = 60;

let cardsInOpponentsHand = 0;
const maxHandSize = 4;
const maxBoardSize = 3;
const maxShield = 4;

let inspectCard = null;
let attackingCard = null;
let gameWin = 0;

// Gonna need lots of refactoring, and sorting
class Board{
	constructor(){
		console.log('initBoard');
		ctx.font = "12px Arial";
		canvas.style.backgroundColor = 'rgb(143 153 150)';
		cards.src = 'images/deck.svg';
		back.src = 'images/uno.svg';
		ctx.fillStyle = '#000';
	}

	drawBoard(){
		// Reset board
		ctx.clearRect(0, 0, canvas.width, canvas.height);
		// Room Name
		ctx.fillText(name, 0, 10);

		this.drawCardsOnBoard();
		this.drawCardsOnBoardOpponent();

		this.drawDeck();
		this.drawDeckOpponent();

		this.drawShield();
		this.drawShieldOpponent();

		this.drawHand();
		this.drawOpponentHand();

		this.drawPlayerNames('Nathan', 'Evil Nathan');

		if(gameWin){
			this.drawWin();
		}

		this.drawInspectedCard();
	}

	drawWin(){
		var winBoard = new Shape({
			name: name,
			x: 0,
			y: canvas.height/2 - (canvas.height/4)/2,
			width: canvas.width,
			height: canvas.height/4,
			fillStyle: '#CCC',
			strokeStyle: '#00EEAA' 
		});
		winBoard.draw();

		ctx.fillStyle = '#000';
		ctx.font = "bold 50pt Arial";
		ctx.fillText('WINNER', 200, 300);
		ctx.font = "10pt Arial";
	}

	drawPlayerNames(playerName, opponentName = false){
		// Player Name
		ctx.fillText(playerName, 50, canvas.height - 50);

		// Opponent's Name
		if(!opponentName){
			// Just clear the name
		}else{
			ctx.fillText(opponentName, canvas.width - (ctx.measureText(opponentName).width + 50), 50);
		}
	}

	// Draw Invidual Cards, called by other deck stuff
	// Might be put into a card class, makes sense, eh.
	drawCard(array, arrayKey, name, positionX, positionY, width, height, fill, border){
		// Card Colour
		//console.log('drawCard card: '+JSON.stringify(array[arrayKey]));
		let colourId = array[arrayKey].colour;
		if(colourId == 0){ fill = '#EEE' }
		else if(colourId == 1){ fill = '#0033EE' }

		var cardClickable = new Shape({
			name: name,
			x: positionX,
			y: positionY,
			width: width,
			height: height,
			fillStyle: fill,
			strokeStyle: border
		});

		array[arrayKey]['clickable'] = cardClickable;
		array[arrayKey]['clickable'].draw();

		// Add image
		// half circle for unit Set start angle to 0 and end angle to Math.PI.
		// Ellipse for token (near full size)
		// Octagon for spell
		let cardImageContainer = new Shape({
			shape: 'semi',
			name: 'cardImageContainer_'+name,
			x: positionX+height/3,
			y: positionY+width/2,
			width: width*.9,
			height: height*.9,
			fillStyle: "#BBB"
		});
		cardImageContainer.draw();

		// Add card name
		let fontSize = width/cardWidth*10; // 10 = baseFontSize of 10pt
		ctx.font = "bold "+fontSize+"pt Arial";
		ctx.fillStyle = '#000';
		ctx.fillText(
			array[arrayKey]['name']
			, positionX + (ctx.measureText(array[arrayKey]['name']/2).width) - width/4
			, positionY+height*.25
		);

		// Add card type
		ctx.fillText(
			array[arrayKey]['type']
			, positionX + (ctx.measureText(array[arrayKey]['type']/2).width) - width/4
			, positionY+height*.7
		);
		// Add text/effect area
		if(array[arrayKey]['effect'] !== null){
			ctx.fillText(
				array[arrayKey]['effect']
				, positionX + (ctx.measureText(array[arrayKey]['effect']/2).width) - width/4
				, positionY+height*.8
			);
		}
		// Attack
		ctx.fillText(
			array[arrayKey]['atk']
			, positionX + (ctx.measureText(array[arrayKey]['atk']).width)
			, positionY+height*.95
		);
		// Add cost
		ctx.fillText(
			array[arrayKey]['cost']
			, positionX + (ctx.measureText(array[arrayKey]['cost']).width)
			, positionY+height*.1
		);

		// Unbold font for other draws
		ctx.font = "10pt Arial";
	}

	drawDeck(){
		// Deck
		clickableItems['deckSprite'] = new Shape({
			name: 'deck',
			x: canvas.width-cardWidth*1.5-40,
			y: canvas.height-cardHeight*1.5-60,
			width: cardWidth*1.5,
			height: cardHeight*1.5,
			fillStyle: "#0000FF"
		});
		//ctx.fillRect(canvas.width-cardWidth/2-60, canvas.height/2-cardHeight/4, cardWidth/2, cardHeight/2);
		clickableItems['deckSprite'].draw();
		let deckCounterSprite = new Shape({
			shape: 'circle',
			name: 'deckCounter',
			x: canvas.width-cardWidth*.6,
			y: canvas.height-cardHeight*.6,
			width: cardWidth*.375,
			height: cardHeight*.375,
			fillStyle: "#FFF"
		});
		deckCounterSprite.draw();

		// TODO: Center in the circle
		ctx.fillStyle = '#000';
		ctx.fillText(playerDeck.length, canvas.width-cardWidth*.6 - (ctx.measureText(playerDeck.length).width) + 7, canvas.height-cardHeight*.6 + 5);
	}
	drawDeckOpponent(){
		// Opponent's Deck
		clickableItems['deckOpponentSprite'] = new Shape({
			name: 'deckOpponent',
			x: 40,
			y: 60,
			width: cardWidth*1.5,
			height: cardHeight*1.5,
			fillStyle: "#FF0000"
		});
		clickableItems['deckOpponentSprite'].draw();
		let deckCounterOpponentSprite = new Shape({
			shape: 'circle',
			name: 'deckCounterOpponent',
			x: cardWidth*1.5+(cardWidth*.375),
			y: cardHeight*1.5+(cardHeight*.375),
			width: cardWidth*.375,
			height: cardHeight*.375,
			fillStyle: "#FFF"
		});
		deckCounterOpponentSprite.draw();

		ctx.fillStyle = '#000';
		// TODO: Center in the circle
		ctx.fillText(opponentDeck.length, cardWidth*1.5 + (ctx.measureText(opponentDeck.length).width) + 10, cardHeight*1.9);
	}

	// Naming's getting awkward here...
	// Draw the cards in hand
	drawHand(){
		// Player Hand/Cards in Hand
		for (let i = 0; i < playerHand.length; i++) {

			let name = 'cardInHand_'+(i+1);

			let cardPadding = 10;
			let fill = '#'+i+i+'FF00';

			// TODO: fix positionX, actually have some maffs
			let positionX	= canvas.width/2 - (cardWidth * (playerHand.length - (i+1)) - (cardPadding * (i+1)));
			let positionY	= canvas.height-cardWidth*1.5-20;
			let width	= cardWidth;
			let height	= cardHeight;

			this.drawCard(playerHand, i, name, positionX, positionY, width, height, fill);
		}

	}

	drawOpponentHand(){
		// Opponents Hand/Cards in Hand
		for (let i = 0; i < opponentHand.length; i++) {

			let name = 'cardInOpponentsHand_'+(i+1);

			let cardPadding = 10;
			let fill = '#'+i+i+'DD00';

			// TODO: fix positionX, actually have some maffs
			let positionX = canvas.width/2 - (cardWidth * (opponentHand.length - (i+1)) - (cardPadding * (i+1)));
			let positionY = 20;
			let width	= cardWidth;
			let height	= cardHeight;

			this.drawCard(opponentHand, i, name, positionX, positionY, width, height, fill);
		}

	}

	drawCards(){}

	// Draw a card, traditional TCG
	drawACard(cardsToDraw = 1){
		// For loop so that animations will play each time (when they exist)
		for(let draw = 0; draw < cardsToDraw; draw++){
			if(playerHand.length >= maxHandSize){
				alert('Hand full '+playerHand.length+'/'+maxHandSize);
				return 0;
			}

			// Random card from deck, remove from deck, add to hand
			let cardToDraw	= Math.floor(Math.random() * deckCount);
			let cardDrawn	= playerDeck[cardToDraw];
			// Remove from deck
			playerDeck.splice(cardToDraw, 1);
			// Add to hand
			playerHand.push(cardDrawn);
			this.drawBoard();
		}
	}
	drawACardOpponent(cardsToDraw = 1){
		for(let draw = 0; draw < cardsToDraw; draw++){
			if(opponentHand.length >= maxHandSize){
				alert('Hand full '+opponentHand.length+'/'+maxHandSize);
				return 0;
			}
			// Random card from deck, remove from deck, add to hand
			let cardToDraw	= Math.floor(Math.random() * deckCountOpponent);
			let cardDrawn	= opponentDeck[cardToDraw];
			// Remove from deck
			opponentDeck.splice(cardToDraw, 1);
			// Add to hand
			opponentHand.push(cardDrawn);
			this.drawBoard();
		}
	}


	drawCardsOnBoard(){
		// DUPE OF DRAW PLAYER HAND FOR NOW!!!
		for (let i = 0; i < playerBoard.length; i++) {

			let name = 'cardOnBoard_'+(i+1);

			let cardPadding = 10;
			let fill = '#'+i+i+'CC00';

			// TODO: fix positionX, actually have some maffs
			let positionX = canvas.width/2 - (cardWidth * (playerBoard.length - (i+1)) - (cardPadding * (i+1)));
			let positionY = canvas.height - cardHeight-30-(cardHeight);
			let width	= cardWidth;
			let height	= cardHeight;
			let border	= false;

			if(attackingCard !== null && playerBoard[i].name == attackingCard[0].name){
				border = '#FF0000';
			}
			this.drawCard(playerBoard, i, name, positionX, positionY, width, height, fill, border);
		}
	}

	drawCardsOnBoardOpponent(){
		for (let i = 0; i < opponentBoard.length; i++) {

			let name = 'cardOnBoardOpponent_'+(i+1);

			let cardPadding = 10;
			let fill = '#'+i+i+'AA00';

			// TODO: fix positionX, actually have some maffs
			let positionX = canvas.width/2 - (cardWidth * (opponentBoard.length - (i+1)) - (cardPadding * (i+1)));
			let positionY = cardHeight + 30;
			let width	= cardWidth;
			let height	= cardHeight;

			this.drawCard(opponentBoard, i, name, positionX, positionY, width, height, fill);
		}
	}

	// Currently only functionality in hand
	playCardToBoard(index){
		// Get the card data
		let cardPlayed = playerHand[index];

		// Check if there's space on board to play
		// TODO: Check this in back-end
		if(playerBoard.length >= maxBoardSize){
			alert('No space on board to play card. '+playerBoard.length+'/'+maxBoardSize);
			return 0;
		}

		// Remove from hand
		playerHand.splice(index, 1);
		// Add to board
		playerBoard.push(cardPlayed);

		this.drawBoard();
	}
	playCardToBoardFromDeckOpponent(){

		// Random card from deck
		let cardToDraw	= Math.floor(Math.random() * deckCount);
		let cardPlayed = opponentDeck[cardToDraw];

		if(opponentBoard.length >= maxBoardSize){
			alert('No space on board to play card. '+opponentBoard.length+'/'+maxBoardSize);
			return 0;
		}

		// Remove from deck
		opponentDeck.splice(cardToDraw, 1);
		// Add to board
		opponentBoard.push(cardPlayed);

		this.drawBoard();
	}
	inspectOpponentBoard(index){
		// Get the card data
		inspectCard = [opponentBoard, index];

		this.drawBoard();
	}
	drawInspectedCard(){
		if(inspectCard != null){
			let positionX = canvas.width/2 - cardWidth;
			let positionY = canvas.height/2 - cardHeight;
			let width	= cardWidth*2;
			let height	= cardHeight*2;

			this.drawCard(inspectCard[0], inspectCard[1], name, positionX, positionY, width, height, '#D1D100');
			console.log('inspect');
		}
	}

	// Selects the card that will be attacking
	// Stop other actions besides selecting opponent/opponent unit
	// Can cancel, will do later
	startAttack(index){
		// Can probably combine attacking/inspect, and set another array element to 'attacking', 'inspecting', etc.
		attackingCard = [playerBoard[index], index];
		this.drawBoard();
	}
	// Do the attack
	makeAttack(index, array = null, name = null){
		if(array == null){ array = opponentBoard; name = 'opponentBoard' }
		console.log(name);
		// If card attacked
		// Compare attackingCard and defendingCard	

		let defendingCard = array[index];

		// If hitting shield, don't calc combat damage
		if(name == 'opponentShield'){
			// This should tap the card first, then after all shields
			// are tapped, THEN attacking destroys them
			array.splice(index, 1);
			opponentHand.push(array[index]);
			this.endAttack();
			return 1;
		}

		if(defendingCard.atk <= attackingCard[0].atk){
			array.splice(index, 1);
			// Need to push to grave, etc. here in future too
		}
		if(attackingCard[0].atk <= defendingCard.atk){
			playerBoard.splice(attackingCard[1], 1);
		}
		console.log('attacking');
		this.endAttack();
		
		// If player attacked
		// Compare life/remove life cards 5/10/15,1/2/3?
	}
	endAttack(){
		attackingCard = null;
		if(opponentShield.length <= 0){
			gameWin = 1;
		}
		this.drawBoard();
	}

	// Like everything else, need to consolidate into one function that
	// can work for both players, and even more for 2v2 3v1 combats, etc.
	playShield(shieldsToPlay = 4){
		for(let shieldNo = 0; shieldNo < shieldsToPlay; shieldNo++){
			if(playerShield.length >= maxShield){
				alert('Shield zone full '+playerShield.length+'/'+maxShield);
				return 0;
			}

			// Random card from deck, remove from deck, add to hand
			let cardToDraw	= Math.floor(Math.random() * deckCount);
			let cardDrawn	= playerDeck[cardToDraw];
			// Remove from deck
			playerDeck.splice(cardToDraw, 1);
			// Add to shield zone
			playerShield.push(cardDrawn);
			this.drawBoard();
		}
	}
	playShieldOpponent(shieldsToPlay = 4){
		for(let shieldNo = 0; shieldNo < shieldsToPlay; shieldNo++){
			if(opponentShield.length >= maxShield){
				alert('Shield zone full '+opponentShield.length+'/'+maxShield);
				return 0;
			}

			// Random card from deck, remove from deck, add to hand
			let cardToDraw	= Math.floor(Math.random() * deckCount);
			let cardDrawn	= opponentDeck[cardToDraw];
			// Remove from deck
			opponentDeck.splice(cardToDraw, 1);
			// Add to shield zone
			opponentShield.push(cardDrawn);
			this.drawBoard();
		}
	}
	drawShield(){
		for (let i = 0; i < playerShield.length; i++) {

			let name = 'playerShield_'+(i+1);

			let shieldMargin = 10;
			let fromX	= 60;
			let fromY	= 300;
			let fill = '#'+i+i+'0000';
			let cWidth	= cardWidth*.8;
			let cHeight	= cardHeight*.8;
			let split	= 0;
			if(i>=2){ split = 1; }

			// i%2 0 = 0, 1 = 1, 2 = 0, 3 = 1 to prevent margin from X/Y axis, and just between cards
			let positionX	= (fromX+((i%2)*shieldMargin)) +(i%2*cWidth);
			let positionY	= canvas.height-fromY+(split*cHeight+(shieldMargin*split));
			let width	= cWidth;
			let height	= cHeight;
			console.log('i: '+i+' X: '+positionX+' Y: '+positionY);

			this.drawCard(playerShield, i, name, positionX, positionY, width, height, fill);
		}
	}
	drawShieldOpponent(){
		for (let i = 0; i < opponentShield.length; i++) {

			let name = 'opponentShield_'+(i+1);

			let shieldMargin = 10;
			let fromX	= canvas.width-60;
			let fromY	= 300;
			let fill = '#'+i+i+'0000';
			let cWidth	= cardWidth*.8;
			let cHeight	= cardHeight*.8;
			let split	= 0;
			if(i>=2){ split = 1; }

			// i%2 0 = 0, 1 = 1, 2 = 0, 3 = 1 to prevent margin from X/Y axis, and just between cards
			let positionX	= (fromX+((i%2)*shieldMargin))+(i%2*cWidth)-(cWidth*2);
			let positionY	= fromY+(split*cHeight+(shieldMargin*split))-(cHeight*2 + shieldMargin);
			let width	= cWidth;
			let height	= cHeight;
			console.log('i: '+i+' X: '+positionX+' Y: '+positionY);

			this.drawCard(opponentShield, i, name, positionX, positionY, width, height, fill);
		}
	}
}

// TEMP!!
createDeckList(playerDeck, deckCount);
createDeckList(opponentDeck, deckCountOpponent);

// Run board commands here for testing
let board = new Board;
//board.initBoard();

// TEMP: Play a card on opponents board (from their deck)
board.playCardToBoardFromDeckOpponent();

board.drawBoard();

board.playShield(4);
board.playShieldOpponent(4);

board.drawACard(3);

canvas.addEventListener('click', function(event) {
	console.log('EVENT LISTENER');
	console.log('');

	// specialEvent used to prevent eventTriggers if something specific
	// is being done, attack needs to be made, inspecting card.
	// Prevents user from doing other actions until completed or cancelled event
	let specialEvent = false;
	if(inspectCard !== null || attackingCard !== null || gameWin){
		specialEvent = true;
	}

	var x = event.pageX - canvasLeft,
	    y = event.pageY - canvasTop;

	// Collision detection between clicked offset and clickableItems
	// https://stackoverflow.com/a/9880302

	if(inspectCard !== null){
		console.log(inspectCard);
		clickable = inspectCard[0][inspectCard[1]].clickable;
		console.log(clickable);

		if(clickableCheck(x,y,clickable)){
			console.log('clicked inspect card');

		}else{
			console.log('not inspected card');
			// Stop inspecting card if player clicks off it
			inspectCard = null;
			board.drawBoard();
		}
	}

	// # PLAYER DECK
	clickable = clickableItems['deckSprite'];

	// Want to loop clickables ideally, and call a function
	// that's set to them for click, hover, etc.
	// TODO: potentially loop all clickables, and do a check on clickable.name to differ event handling per-item

	// For now this will be fine, as it functions
	if(clickableCheck(x,y,clickable) && !specialEvent){
		board.drawACard();
	}

	// # OPPONENT DECK
	clickable = clickableItems['deckOpponentSprite'];

	if(clickableCheck(x,y,clickable) && !specialEvent){
		board.drawACardOpponent();
	}

	// # PLAYER HAND
	playerHand.forEach(function(card, index){

		let clickable = card.clickable;

		if(clickableCheck(x,y,clickable) && !specialEvent){

			board.playCardToBoard(index);
			
			// This would actually fire off a socketIO doodad, that would then return
			// data, and redraw. But for now (UI test)

			// Add to board
			board.drawBoard();
		}
	});

	// # PLAYER BOARD
	playerBoard.forEach(function(card, index){
		let clickable = card.clickable;

		if(clickableCheck(x,y,clickable)){
			if(attackingCard !== null && card == attackingCard[0]){
				board.endAttack();
			}
			if(!specialEvent){
				board.startAttack(index);
			}
			board.drawBoard();
		}
	});

	// # OPPONENT BOARD
	opponentBoard.forEach(function(card, index){
		let clickable = card.clickable;

		if(clickableCheck(x,y,clickable)){
			// Check if card if getting attacked
			if(attackingCard !== null){
				board.makeAttack(index);
			}

			if(!specialEvent){
				board.inspectOpponentBoard(index);
			}
			board.drawBoard();
		}
	});
	// # OPPONENT SHIELD
	opponentShield.forEach(function(card, index){
		let clickable = card.clickable;

		if(clickableCheck(x,y,clickable)){
			// Check if card if getting attacked
			if(attackingCard !== null){
				board.makeAttack(index, opponentShield, 'opponentShield');
			}
			board.drawBoard();
		}
	});

}, false);

function clickableCheck(x,y,clickable){

	// Debug Stuff
	let debug = false
	if(debug){
		console.log(clickable.y+' <');
		console.log(y+ '<')
		console.log(clickable.y+clickable.height);
	}

	if(
		y > clickable.y && y < clickable.y + clickable.height
		&& x > clickable.x && x < clickable.x + clickable.width)
	{
		return true;
	}

	return false;
	
}

// TEMP: Create a deck of X different cards that can be drawn/played
// for UI development, will be done on server and not shown to clients
function createDeckList(deck, deckCount){
	for(let i = 0; i < deckCount; i++){
		// Randomise colour
		let colour	= Math.floor(Math.random() * 2);
		let effect	= Math.floor(Math.random() * 5);
		if(effect == 0){ effect = 'effect here'; } else{ effect = null }

		deck.push({
			'name':'CardName '+(i+1)
			, 'cost':1
			, 'atk':1
			, 'def':1
			, 'rarity': 'common'
			, 'effect':effect
			, 'type':'human'
			, 'colour':colour
		});
	}
}