my-board seems OK. Now TODO: test my-game (with sockets)

[vchess.git] / public / javascripts / components / board.js

Vue.component('my-board', {
	// Last move cannot be guessed from here, and is required to highlight squares
	// vr: object to check moves, print board...
	props: ["vr","lastMove","mode","orientation","userColor","gameOver"],
	data: function () {
		return {
			hints: (!localStorage["hints"] ? true : localStorage["hints"] === "1"),
			bcolor: localStorage["bcolor"] || "lichess", //lichess, chesscom or chesstempo
			possibleMoves: [], //filled after each valid click/dragstart
			choices: [], //promotion pieces, or checkered captures... (as moves)
			selectedPiece: null, //moving piece (or clicked piece)
			incheck: [],
			start: {}, //pixels coordinates + id of starting square (click or drag)
		};
	},
	render(h) {
		if (!this.vr)
			return;
		const [sizeX,sizeY] = [V.size.x,V.size.y];
		// Precompute hints squares to facilitate rendering
		let hintSquares = doubleArray(sizeX, sizeY, false);
		this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
		// Also precompute in-check squares
		let incheckSq = doubleArray(sizeX, sizeY, false);
		this.incheck.forEach(sq => { incheckSq[sq[0]][sq[1]] = true; });
		const squareWidth = 40; //TODO: compute this
		const choices = h(
			'div',
			{
				attrs: { "id": "choices" },
				'class': { 'row': true },
				style: {
					"display": this.choices.length>0?"block":"none",
					"top": "-" + ((sizeY/2)*squareWidth+squareWidth/2) + "px",
					"width": (this.choices.length * squareWidth) + "px",
					"height": squareWidth + "px",
				},
			},
			this.choices.map(m => { //a "choice" is a move
				return h('div',
					{
						'class': {
							'board': true,
							['board'+sizeY]: true,
						},
						style: {
							'width': (100/this.choices.length) + "%",
							'padding-bottom': (100/this.choices.length) + "%",
						},
					},
					[h('img',
						{
							attrs: { "src": '/images/pieces/' +
								V.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
							'class': { 'choice-piece': true },
							on: {
								"click": e => { this.play(m); this.choices=[]; },
								// NOTE: add 'touchstart' event to fix a problem on smartphones
								"touchstart": e => { this.play(m); this.choices=[]; },
							},
						})
					]
				);
			})
		);
		// Create board element (+ reserves if needed by variant or mode)
		const lm = this.lastMove;
		const showLight = this.hints && variant.name != "Dark";
		const gameDiv = h(
			'div',
			{
				'class': {
					'game': true,
					'clearer': true,
				},
			},
			[_.range(sizeX).map(i => {
				let ci = (this.orientation=='w' ? i : sizeX-i-1);
				return h(
					'div',
					{
						'class': {
							'row': true,
						},
						style: { 'opacity': this.choices.length>0?"0.5":"1" },
					},
					_.range(sizeY).map(j => {
						let cj = (this.orientation=='w' ? j : sizeY-j-1);
						let elems = [];
						if (this.vr.board[ci][cj] != V.EMPTY && (variant.name!="Dark"
							|| this.gameOver || this.mode == "analyze"
							|| this.vr.enlightened[this.userColor][ci][cj]))
						{
							elems.push(
								h(
									'img',
									{
										'class': {
											'piece': true,
											'ghost': !!this.selectedPiece
												&& this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
										},
										attrs: {
											src: "/images/pieces/" +
												V.getPpath(this.vr.board[ci][cj]) + ".svg",
										},
									}
								)
							);
						}
						if (this.hints && hintSquares[ci][cj])
						{
							elems.push(
								h(
									'img',
									{
										'class': {
											'mark-square': true,
										},
										attrs: {
											src: "/images/mark.svg",
										},
									}
								)
							);
						}
						return h(
							'div',
							{
								'class': {
									'board': true,
									['board'+sizeY]: true,
									'light-square': (i+j)%2==0,
									'dark-square': (i+j)%2==1,
									[this.bcolor]: true,
									'in-shadow': variant.name=="Dark" && !this.gameOver
										&& this.mode != "analyze"
										&& !this.vr.enlightened[this.userColor][ci][cj],
									'highlight': showLight && !!lm && _.isMatch(lm.end, {x:ci,y:cj}),
									'incheck': showLight && incheckSq[ci][cj],
								},
								attrs: {
									id: this.getSquareId({x:ci,y:cj}),
								},
							},
							elems
						);
					})
				);
			}), choices]
		);
		let elementArray = [choices, gameDiv];
		if (!!this.vr.reserve)
		{
			const shiftIdx = (this.userColor=="w" ? 0 : 1);
			let myReservePiecesArray = [];
			for (let i=0; i<V.RESERVE_PIECES.length; i++)
			{
				myReservePiecesArray.push(h('div',
				{
					'class': {'board':true, ['board'+sizeY]:true},
					attrs: { id: this.getSquareId({x:sizeX+shiftIdx,y:i}) }
				},
				[
					h('img',
					{
						'class': {"piece":true, "reserve":true},
						attrs: {
							"src": "/images/pieces/" +
								this.vr.getReservePpath(this.userColor,i) + ".svg",
						}
					}),
					h('sup',
						{"class": { "reserve-count": true } },
						[ this.vr.reserve[this.userColor][V.RESERVE_PIECES[i]] ]
					)
				]));
			}
			let oppReservePiecesArray = [];
			const oppCol = V.GetOppCol(this.userColor);
			for (let i=0; i<V.RESERVE_PIECES.length; i++)
			{
				oppReservePiecesArray.push(h('div',
				{
					'class': {'board':true, ['board'+sizeY]:true},
					attrs: { id: this.getSquareId({x:sizeX+(1-shiftIdx),y:i}) }
				},
				[
					h('img',
					{
						'class': {"piece":true, "reserve":true},
						attrs: {
							"src": "/images/pieces/" +
								this.vr.getReservePpath(oppCol,i) + ".svg",
						}
					}),
					h('sup',
						{"class": { "reserve-count": true } },
						[ this.vr.reserve[oppCol][V.RESERVE_PIECES[i]] ]
					)
				]));
			}
			let reserves = h('div',
				{
					'class':{
						'game': true,
						"reserve-div": true,
					},
				},
				[
					h('div',
						{
							'class': {
								'row': true,
								"reserve-row-1": true,
							},
						},
						myReservePiecesArray
					),
					h('div',
						{ 'class': { 'row': true }},
						oppReservePiecesArray
					)
				]
			);
			elementArray.push(reserves);
		}
		return h(
			'div',
			{
				'class': {
					"col-sm-12":true,
					"col-md-10":true,
					"col-md-offset-1":true,
					"col-lg-8":true,
					"col-lg-offset-2":true,
				},
				// NOTE: click = mousedown + mouseup
				on: {
					mousedown: this.mousedown,
					mousemove: this.mousemove,
					mouseup: this.mouseup,
					touchstart: this.mousedown,
					touchmove: this.mousemove,
					touchend: this.mouseup,
				},
			},
			elementArray
		);
	},
	methods: {
		// Get the identifier of a HTML square from its numeric coordinates o.x,o.y.
		getSquareId: function(o) {
			// NOTE: a separator is required to allow any size of board
			return  "sq-" + o.x + "-" + o.y;
		},
		// Inverse function
		getSquareFromId: function(id) {
			let idParts = id.split('-');
			return [parseInt(idParts[1]), parseInt(idParts[2])];
		},
		mousedown: function(e) {
			e = e || window.event;
			let ingame = false;
			let elem = e.target;
			while (!ingame && elem !== null)
			{
				if (elem.classList.contains("game"))
				{
					ingame = true;
					break;
				}
				elem = elem.parentElement;
			}
			if (!ingame) //let default behavior (click on button...)
				return;
			e.preventDefault(); //disable native drag & drop
			if (!this.selectedPiece && e.target.classList.contains("piece"))
			{
				// Next few lines to center the piece on mouse cursor
				let rect = e.target.parentNode.getBoundingClientRect();
				this.start = {
					x: rect.x + rect.width/2,
					y: rect.y + rect.width/2,
					id: e.target.parentNode.id
				};
				this.selectedPiece = e.target.cloneNode();
				this.selectedPiece.style.position = "absolute";
				this.selectedPiece.style.top = 0;
				this.selectedPiece.style.display = "inline-block";
				this.selectedPiece.style.zIndex = 3000;
				const startSquare = this.getSquareFromId(e.target.parentNode.id);
				this.possibleMoves = [];
				const color = this.mode=="analyze" || this.gameOver
					? this.vr.turn
					: this.userColor;
				if (this.vr.canIplay(color,startSquare))
					this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
				// Next line add moving piece just after current image
				// (required for Crazyhouse reserve)
				e.target.parentNode.insertBefore(this.selectedPiece, e.target.nextSibling);
			}
		},
		mousemove: function(e) {
			if (!this.selectedPiece)
				return;
			e = e || window.event;
			// If there is an active element, move it around
			if (!!this.selectedPiece)
			{
				const [offsetX,offsetY] = !!e.clientX
					? [e.clientX,e.clientY] //desktop browser
					: [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
				this.selectedPiece.style.left = (offsetX-this.start.x) + "px";
				this.selectedPiece.style.top = (offsetY-this.start.y) + "px";
			}
		},
		mouseup: function(e) {
			if (!this.selectedPiece)
				return;
			e = e || window.event;
			// Read drop target (or parentElement, parentNode... if type == "img")
			this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coords
			const [offsetX,offsetY] = !!e.clientX
				? [e.clientX,e.clientY]
				: [e.changedTouches[0].pageX, e.changedTouches[0].pageY];
			let landing = document.elementFromPoint(offsetX, offsetY);
			this.selectedPiece.style.zIndex = 3000;
			// Next condition: classList.contains(piece) fails because of marks
			while (landing.tagName == "IMG")
				landing = landing.parentNode;
			if (this.start.id == landing.id)
			{
				// A click: selectedPiece and possibleMoves are already filled
				return;
			}
			// OK: process move attempt
			let endSquare = this.getSquareFromId(landing.id);
			let moves = this.findMatchingMoves(endSquare);
			this.possibleMoves = [];
			if (moves.length > 1)
				this.choices = moves;
			else if (moves.length==1)
				this.play(moves[0]);
			// Else: impossible move
			this.selectedPiece.parentNode.removeChild(this.selectedPiece);
			delete this.selectedPiece;
			this.selectedPiece = null;
		},
		findMatchingMoves: function(endSquare) {
			// Run through moves list and return the matching set (if promotions...)
			let moves = [];
			this.possibleMoves.forEach(function(m) {
				if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
					moves.push(m);
			});
			return moves;
		},
		play: function(move) {
			this.$emit('play-move', move);
		},
	},
})