public/javascripts/components/game.js

   1 // TODO: use indexedDB instead of localStorage? (more flexible...)
   2
   3 Vue.component('my-game', {
   4     data: function() {
   5         return {
   6             vr: null, //object to check moves, store them, FEN..
   7             mycolor: "w",
   8             possibleMoves: [], //filled after each valid click/dragstart
   9             choices: [], //promotion pieces, or checkered captures... (contain possible pieces)
  10             start: {}, //pixels coordinates + id of starting square (click or drag)
  11             selectedPiece: null, //moving piece (or clicked piece)
  12             conn: null, //socket messages
  13             score: "*", //'*' means 'unfinished'
  14             mode: "idle", //human, computer or idle (when not playing)
  15             oppid: "", //opponent ID in case of HH game
  16             oppConnected: false,
  17             seek: false,
  18         };
  19     },
  20     render(h) {
  21         let [sizeX,sizeY] = VariantRules.size;
  22         // Precompute hints squares to facilitate rendering
  23         let hintSquares = doubleArray(sizeX, sizeY, false);
  24         this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
  25         let elementArray = [];
  26         let square00 = document.getElementById("sq-0-0");
  27         let squareWidth = !!square00
  28             ? parseFloat(window.getComputedStyle(square00).width.slice(0,-2))
  29             : 0;
  30         const playingHuman = (this.mode == "human");
  31         const playingComp = (this.mode == "computer");
  32         let actionArray = [
  33             h('button',
  34                 {
  35                     on: {
  36                         click: () => {
  37                             if (this.seek)
  38                                 delete localStorage["newgame"]; //cancel game seek
  39                             else
  40                             {
  41                                 localStorage["newgame"] = variant;
  42                                 this.newGame("human");
  43                             }
  44                             this.seek = !this.seek;
  45                         }
  46                     },
  47                     attrs: { "aria-label": 'New game VS human' },
  48                     'class': {
  49                         "tooltip": true,
  50                         "seek": this.seek,
  51                         "playing": playingHuman,
  52                     },
  53                 },
  54                 [h('i', { 'class': { "material-icons": true } }, "accessibility")]),
  55             h('button',
  56                 {
  57                     on: { click: () => this.newGame("computer") },
  58                     attrs: { "aria-label": 'New game VS computer' },
  59                     'class': {
  60                         "tooltip":true,
  61                         "playing": playingComp,
  62                     },
  63                 },
  64                 [h('i', { 'class': { "material-icons": true } }, "computer")])
  65         ];
  66         if (!!this.vr)
  67         {
  68             if (this.mode == "human")
  69             {
  70                 let connectedIndic = h(
  71                     'div',
  72                     {
  73                         "class": {
  74                             "connected": this.oppConnected,
  75                             "disconnected": !this.oppConnected,
  76                         },
  77                     }
  78                 );
  79                 elementArray.push(connectedIndic);
  80             }
  81             let choices = h('div',
  82                 {
  83                     attrs: { "id": "choices" },
  84                     'class': { 'row': true },
  85                     style: {
  86                         //"position": "relative",
  87                         "display": this.choices.length>0?"block":"none",
  88                         "top": "-" + ((sizeY/2)*squareWidth+squareWidth/2) + "px",
  89                         "width": (this.choices.length * squareWidth) + "px",
  90                         "height": squareWidth + "px",
  91                     },
  92                 },
  93                 this.choices.map( m => { //a "choice" is a move
  94                     return h('div',
  95                         {
  96                             'class': { 'board': true },
  97                             style: {
  98                                 'width': (100/this.choices.length) + "%",
  99                                 'padding-bottom': (100/this.choices.length) + "%",
 100                             },
 101                         },
 102                         [h('img',
 103                             {
 104                                 attrs: { "src": '/images/pieces/' + VariantRules.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
 105                                 'class': { 'choice-piece': true, 'board': true },
 106                                 on: { "click": e => { this.play(m); this.choices=[]; } },
 107                             })
 108                         ]
 109                     );
 110                 })
 111             );
 112             // Create board element (+ reserves if needed by variant or mode)
 113             let gameDiv = h('div',
 114                 {
 115                     'class': { 'game': true },
 116                 },
 117                 [_.range(sizeX).map(i => {
 118                     let ci = this.mycolor=='w' ? i : sizeX-i-1;
 119                     return h(
 120                         'div',
 121                         {
 122                             'class': {
 123                                 'row': true,
 124                             },
 125                             style: { 'opacity': this.choices.length>0?"0.5":"1" },
 126                         },
 127                         _.range(sizeY).map(j => {
 128                             let cj = this.mycolor=='w' ? j : sizeY-j-1;
 129                             let elems = [];
 130                             if (this.vr.board[ci][cj] != VariantRules.EMPTY)
 131                             {
 132                                 elems.push(
 133                                     h(
 134                                         'img',
 135                                         {
 136                                             'class': {
 137                                                 'piece': true,
 138                                                 'ghost': !!this.selectedPiece && this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
 139                                             },
 140                                             attrs: {
 141                                                 src: "/images/pieces/" + VariantRules.getPpath(this.vr.board[ci][cj]) + ".svg",
 142                                             },
 143                                         }
 144                                     )
 145                                 );
 146                             }
 147                             if (hintSquares[ci][cj])
 148                             {
 149                                 elems.push(
 150                                     h(
 151                                         'img',
 152                                         {
 153                                             'class': {
 154                                                 'mark-square': true,
 155                                             },
 156                                             attrs: {
 157                                                 src: "/images/mark.svg",
 158                                             },
 159                                         }
 160                                     )
 161                                 );
 162                             }
 163                             const lm = this.vr.lastMove;
 164                             const highlight = !!lm && _.isMatch(lm.end, {x:ci,y:cj}); //&& _.isMatch(lm.start, {x:ci,y:cj})
 165                             return h(
 166                                 'div',
 167                                 {
 168                                     'class': {
 169                                         'board': true,
 170                                         'light-square': !highlight && (i+j)%2==0,
 171                                         'dark-square': !highlight && (i+j)%2==1,
 172                                         'highlight': highlight,
 173                                     },
 174                                     attrs: {
 175                                         id: this.getSquareId({x:ci,y:cj}),
 176                                     },
 177                                 },
 178                                 elems
 179                             );
 180                         })
 181                     );
 182                 }), choices]
 183             );
 184             actionArray.push(
 185                 h('button',
 186                     {
 187                         on: { click: this.resign },
 188                         attrs: { "aria-label": 'Resign' },
 189                         'class': { "tooltip":true },
 190                     },
 191                     [h('i', { 'class': { "material-icons": true } }, "flag")])
 192             );
 193             elementArray.push(gameDiv);
 194     //          if (!!vr.reserve)
 195     //          {
 196     //              let reserve = h('div',
 197     //                  {'class':{'game':true}}, [
 198     //                      h('div',
 199     //                          { 'class': { 'row': true }},
 200     //                          [
 201     //                              h('div',
 202     //                                  {'class':{'board':true}},
 203     //                                  [h('img',{'class':{"piece":true},attrs:{"src":"/images/pieces/wb.svg"}})]
 204     //                              )
 205     //                          ]
 206     //                      )
 207     //                  ],
 208     //              );
 209     //              elementArray.push(reserve);
 210     //          }
 211             let eogMessage = "Unfinished";
 212             switch (this.score)
 213             {
 214                 case "1-0":
 215                     eogMessage = "White win";
 216                     break;
 217                 case "0-1":
 218                     eogMessage = "Black win";
 219                     break;
 220                 case "1/2":
 221                     eogMessage = "Draw";
 222                     break;
 223             }
 224             let elemsOfEog =
 225             [
 226                 h('label',
 227                     {
 228                         attrs: { "for": "modal-control" },
 229                         "class": { "modal-close": true },
 230                     }
 231                 ),
 232                 h('h3',
 233                     {
 234                         "class": { "section": true },
 235                         domProps: { innerHTML: "End of game" },
 236                     }
 237                 ),
 238                 h('p',
 239                     {
 240                         "class": { "section": true },
 241                         domProps: { innerHTML: eogMessage },
 242                     }
 243                 )
 244             ];
 245             if (this.score != "*")
 246             {
 247                 elemsOfEog.push(
 248                     h('p', //'textarea', //TODO: selectable!
 249                         {
 250                             domProps: { innerHTML: this.vr.getPGN(this.mycolor, this.score) },
 251                             //attrs: { "readonly": true },
 252                         }
 253                     )
 254                 );
 255             }
 256             const modalEog = [
 257                 h('input',
 258                     {
 259                         attrs: { "id": "modal-control", type: "checkbox" },
 260                         "class": { "modal": true },
 261                     }),
 262                 h('div',
 263                     {
 264                         attrs: { "role": "dialog", "aria-labelledby": "dialog-title" },
 265                     },
 266                     [
 267                         h('div',
 268                             {
 269                                 "class": { "card": true, "smallpad": true },
 270                             },
 271                             elemsOfEog
 272                         )
 273                     ]
 274                 )
 275             ];
 276             elementArray = elementArray.concat(modalEog);
 277         }
 278         const modalNewgame = [
 279             h('input',
 280                 {
 281                     attrs: { "id": "modal-control2", type: "checkbox" },
 282                     "class": { "modal": true },
 283                 }),
 284             h('div',
 285                 {
 286                     attrs: { "role": "dialog", "aria-labelledby": "dialog-title" },
 287                 },
 288                 [
 289                     h('div',
 290                         {
 291                             "class": { "card": true, "smallpad": true },
 292                         },
 293                         [
 294                             h('label',
 295                                 {
 296                                     attrs: { "id": "close-newgame", "for": "modal-control2" },
 297                                     "class": { "modal-close": true },
 298                                 }
 299                             ),
 300                             h('h3',
 301                                 {
 302                                     "class": { "section": true },
 303                                     domProps: { innerHTML: "New game" },
 304                                 }
 305                             ),
 306                             h('p',
 307                                 {
 308                                     "class": { "section": true },
 309                                     domProps: { innerHTML: "Waiting for opponent..." },
 310                                 }
 311                             )
 312                         ]
 313                     )
 314                 ]
 315             )
 316         ];
 317         elementArray = elementArray.concat(modalNewgame);
 318         const actions = h('div',
 319             {
 320                 attrs: { "id": "actions" },
 321                 'class': { 'text-center': true },
 322             },
 323             actionArray
 324         );
 325         elementArray.push(actions);
 326         return h(
 327             'div',
 328             {
 329                 'class': {
 330                     "col-sm-12":true,
 331                     "col-md-8":true,
 332                     "col-md-offset-2":true,
 333                     "col-lg-6":true,
 334                     "col-lg-offset-3":true,
 335                 },
 336                 // NOTE: click = mousedown + mouseup --> what about smartphone?!
 337                 on: {
 338                     mousedown: this.mousedown,
 339                     mousemove: this.mousemove,
 340                     mouseup: this.mouseup,
 341                     touchdown: this.mousedown,
 342                     touchmove: this.mousemove,
 343                     touchup: this.mouseup,
 344                 },
 345             },
 346             elementArray
 347         );
 348     },
 349     created: function() {
 350         const url = socketUrl;
 351         const continuation = (localStorage.getItem("variant") === variant);
 352         this.myid = continuation
 353             ? localStorage.getItem("myid")
 354             // random enough (TODO: function)
 355             : (Date.now().toString(36) + Math.random().toString(36).substr(2, 7)).toUpperCase();
 356         this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 357         const socketOpenListener = () => {
 358             if (continuation)
 359             {
 360                 // TODO: check FEN integrity with opponent
 361                 const fen = localStorage.getItem("fen");
 362                 const mycolor = localStorage.getItem("mycolor");
 363                 const oppid = localStorage.getItem("oppid");
 364                 const moves = JSON.parse(localStorage.getItem("moves"));
 365                 this.newGame("human", fen, mycolor, oppid, moves, true);
 366                 // Send ping to server, which answers pong if opponent is connected
 367                 this.conn.send(JSON.stringify({code:"ping", oppid:this.oppId}));
 368             }
 369             else if (localStorage.getItem("newgame") === variant)
 370             {
 371                 // New game request has been cancelled on disconnect
 372                 this.seek = true;
 373                 this.newGame("human");
 374             }
 375         };
 376         const socketMessageListener = msg => {
 377             const data = JSON.parse(msg.data);
 378             switch (data.code)
 379             {
 380                 case "newgame": //opponent found
 381                     this.newGame("human", data.fen, data.color, data.oppid); //oppid: opponent socket ID
 382                     break;
 383                 case "newmove": //..he played!
 384                     this.play(data.move, "animate");
 385                     break;
 386                 case "pong": //sent when opponent stayed online after we disconnected
 387                     this.oppConnected = true;
 388                     break;
 389                 case "resign": //..you won!
 390                     this.endGame(this.mycolor=="w"?"1-0":"0-1");
 391                     break;
 392                 // TODO: also use (dis)connect info to count online players
 393                 case "connect":
 394                 case "disconnect":
 395                     if (this.mode == "human" && this.oppid == data.id)
 396                         this.oppConnected = (data.code == "connect");
 397                     break;
 398             }
 399         };
 400         const socketCloseListener = () => {
 401             console.log("Lost connection -- reconnect");
 402             this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 403             this.conn.addEventListener('open', socketOpenListener);
 404             this.conn.addEventListener('message', socketMessageListener);
 405             this.conn.addEventListener('close', socketCloseListener);
 406         };
 407         this.conn.onopen = socketOpenListener;
 408         this.conn.onmessage = socketMessageListener;
 409         this.conn.onclose = socketCloseListener;
 410     },
 411     methods: {
 412         endGame: function(score) {
 413             this.score = score;
 414             let modalBox = document.getElementById("modal-control");
 415             modalBox.checked = true;
 416             //setTimeout(() => { modalBox.checked = false; }, 2000); //disabled, to show PGN
 417             if (this.mode == "human")
 418                 this.clearStorage();
 419             this.mode = "idle";
 420             this.oppid = "";
 421         },
 422         resign: function() {
 423             if (this.mode == "human" && this.oppConnected)
 424             {
 425                 try {
 426                     this.conn.send(JSON.stringify({code: "resign", oppid: this.oppid}));
 427                 } catch (INVALID_STATE_ERR) {
 428                     return; //resign failed for some reason...
 429                 }
 430             }
 431             this.endGame(this.mycolor=="w"?"0-1":"1-0");
 432         },
 433         updateStorage: function() {
 434             if (!localStorage.getItem("myid"))
 435             {
 436                 localStorage.setItem("myid", this.myid);
 437                 localStorage.setItem("variant", variant);
 438                 localStorage.setItem("mycolor", this.mycolor);
 439                 localStorage.setItem("oppid", this.oppid);
 440             }
 441             localStorage.setItem("fen", this.vr.getFen());
 442             localStorage.setItem("moves", JSON.stringify(this.vr.moves));
 443         },
 444         clearStorage: function() {
 445             delete localStorage["variant"];
 446             delete localStorage["myid"];
 447             delete localStorage["mycolor"];
 448             delete localStorage["oppid"];
 449             delete localStorage["fen"];
 450             delete localStorage["moves"];
 451         },
 452         newGame: function(mode, fenInit, color, oppId, moves, continuation) {
 453             const fen = fenInit || VariantRules.GenRandInitFen();
 454             console.log(fen); //DEBUG
 455             this.score = "*";
 456             if (mode=="human" && !oppId)
 457             {
 458                 // Send game request and wait..
 459                 this.clearStorage(); //in case of
 460                 try {
 461                     this.conn.send(JSON.stringify({code:"newgame", fen:fen}));
 462                 } catch (INVALID_STATE_ERR) {
 463                     return; //nothing achieved
 464                 }
 465                 let modalBox = document.getElementById("modal-control2");
 466                 modalBox.checked = true;
 467                 setTimeout(() => { modalBox.checked = false; }, 2000);
 468                 return;
 469             }
 470             this.vr = new VariantRules(fen, moves || []);
 471             this.mode = mode;
 472             if (mode=="human")
 473             {
 474                 // Opponent found!
 475                 if (!continuation)
 476                 {
 477                     // Playing sound fails on game continuation:
 478                     new Audio("/sounds/newgame.mp3").play();
 479                     document.getElementById("modal-control2").checked = false;
 480                 }
 481                 this.oppid = oppId;
 482                 this.oppConnected = true;
 483                 this.mycolor = color;
 484                 this.seek = false;
 485                 delete localStorage["newgame"];
 486             }
 487             else //against computer
 488             {
 489                 this.mycolor = Math.random() < 0.5 ? 'w' : 'b';
 490                 if (this.mycolor == 'b')
 491                     setTimeout(this.playComputerMove, 500);
 492             }
 493         },
 494         playComputerMove: function() {
 495             const compColor = this.mycolor=='w' ? 'b' : 'w';
 496             const compMove = this.vr.getComputerMove(compColor);
 497             // HACK: avoid selecting elements before they appear on page:
 498             setTimeout(() => this.play(compMove, "animate"), 500);
 499         },
 500         // Get the identifier of a HTML table cell from its numeric coordinates o.x,o.y.
 501         getSquareId: function(o) {
 502             // NOTE: a separator is required to allow any size of board
 503             return  "sq-" + o.x + "-" + o.y;
 504         },
 505         // Inverse function
 506         getSquareFromId: function(id) {
 507             let idParts = id.split('-');
 508             return [parseInt(idParts[1]), parseInt(idParts[2])];
 509         },
 510         mousedown: function(e) {
 511             e = e || window.event;
 512             e.preventDefault(); //disable native drag & drop
 513             if (!this.selectedPiece && e.target.classList.contains("piece"))
 514             {
 515                 // Next few lines to center the piece on mouse cursor
 516                 let rect = e.target.parentNode.getBoundingClientRect();
 517                 this.start = {
 518                     x: rect.x + rect.width/2,
 519                     y: rect.y + rect.width/2,
 520                     id: e.target.parentNode.id
 521                 };
 522                 this.selectedPiece = e.target.cloneNode();
 523                 this.selectedPiece.style.position = "absolute";
 524                 this.selectedPiece.style.top = 0;
 525                 this.selectedPiece.style.display = "inline-block";
 526                 this.selectedPiece.style.zIndex = 3000;
 527                 let startSquare = this.getSquareFromId(e.target.parentNode.id);
 528                 this.possibleMoves = this.vr.canIplay(this.mycolor,startSquare)
 529                     ? this.vr.getPossibleMovesFrom(startSquare)
 530                     : [];
 531                 e.target.parentNode.appendChild(this.selectedPiece);
 532             }
 533         },
 534         mousemove: function(e) {
 535             if (!this.selectedPiece)
 536                 return;
 537             e = e || window.event;
 538             // If there is an active element, move it around
 539             if (!!this.selectedPiece)
 540             {
 541                 this.selectedPiece.style.left = (e.clientX-this.start.x) + "px";
 542                 this.selectedPiece.style.top = (e.clientY-this.start.y) + "px";
 543             }
 544         },
 545         mouseup: function(e) {
 546             if (!this.selectedPiece)
 547                 return;
 548             e = e || window.event;
 549             // Read drop target (or parentElement, parentNode... if type == "img")
 550             this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coordinates
 551             let landing = document.elementFromPoint(e.clientX, e.clientY);
 552             this.selectedPiece.style.zIndex = 3000;
 553             while (landing.tagName == "IMG") //classList.contains(piece) fails because of mark/highlight
 554                 landing = landing.parentNode;
 555             if (this.start.id == landing.id) //a click: selectedPiece and possibleMoves already filled
 556                 return;
 557             // OK: process move attempt
 558             let endSquare = this.getSquareFromId(landing.id);
 559             let moves = this.findMatchingMoves(endSquare);
 560             this.possibleMoves = [];
 561             if (moves.length > 1)
 562                 this.choices = moves;
 563             else if (moves.length==1)
 564                 this.play(moves[0]);
 565             // Else: impossible move
 566             this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 567             delete this.selectedPiece;
 568             this.selectedPiece = null;
 569         },
 570         findMatchingMoves: function(endSquare) {
 571             // Run through moves list and return the matching set (if promotions...)
 572             let moves = [];
 573             this.possibleMoves.forEach(function(m) {
 574                 if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
 575                     moves.push(m);
 576             });
 577             return moves;
 578         },
 579         animateMove: function(move) {
 580             let startSquare = document.getElementById(this.getSquareId(move.start));
 581             let endSquare = document.getElementById(this.getSquareId(move.end));
 582             let rectStart = startSquare.getBoundingClientRect();
 583             let rectEnd = endSquare.getBoundingClientRect();
 584             let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
 585             let movingPiece = document.querySelector("#" + this.getSquareId(move.start) + " > img.piece");
 586             // HACK for animation (otherwise with positive translate, image slides "under background"...)
 587             // Possible improvement: just alter squares on the piece's way...
 588             squares = document.getElementsByClassName("board");
 589             for (let i=0; i<squares.length; i++)
 590             {
 591                 let square = squares.item(i);
 592                 if (square.id != this.getSquareId(move.start))
 593                     square.style.zIndex = "-1";
 594             }
 595             movingPiece.style.transform = "translate(" + translation.x + "px," + translation.y + "px)";
 596             movingPiece.style.transitionDuration = "0.2s";
 597             movingPiece.style.zIndex = "3000";
 598             setTimeout( () => {
 599                 for (let i=0; i<squares.length; i++)
 600                     squares.item(i).style.zIndex = "auto";
 601                 movingPiece.style = {}; //required e.g. for 0-0 with KR swap
 602                 this.play(move);
 603             }, 200);
 604         },
 605         play: function(move, programmatic) {
 606             if (!!programmatic) //computer or human opponent
 607             {
 608                 this.animateMove(move);
 609                 return;
 610             }
 611             // Not programmatic, or animation is over
 612             if (this.mode == "human" && this.vr.turn == this.mycolor)
 613             {
 614                 if (!this.oppConnected)
 615                     return; //abort move if opponent is gone
 616                 try {
 617                     this.conn.send(JSON.stringify({code:"newmove", move:move, oppid:this.oppid}));
 618                 } catch(INVALID_STATE_ERR) {
 619                     return; //abort also if sending failed
 620                 }
 621             }
 622             new Audio("/sounds/chessmove1.mp3").play();
 623             this.vr.play(move, "ingame");
 624             if (this.mode == "human")
 625                 this.updateStorage(); //after our moves and opponent moves
 626             const eog = this.vr.checkGameOver(this.vr.turn);
 627             if (eog != "*")
 628                 this.endGame(eog);
 629             else if (this.mode == "computer" && this.vr.turn != this.mycolor)
 630                 setTimeout(this.playComputerMove, 500);
 631         },
 632     },
 633 })