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             fenStart: "",
  19             incheck: [],
  20         };
  21     },
  22     render(h) {
  23         let [sizeX,sizeY] = VariantRules.size;
  24         // Precompute hints squares to facilitate rendering
  25         let hintSquares = doubleArray(sizeX, sizeY, false);
  26         this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
  27         // Also precompute in-check squares
  28         let incheckSq = doubleArray(sizeX, sizeY, false);
  29         this.incheck.forEach(sq => { incheckSq[sq[0]][sq[1]] = true; });
  30         let elementArray = [];
  31         let square00 = document.getElementById("sq-0-0");
  32         let squareWidth = !!square00
  33             ? parseFloat(window.getComputedStyle(square00).width.slice(0,-2))
  34             : 0;
  35         const playingHuman = (this.mode == "human");
  36         const playingComp = (this.mode == "computer");
  37         let actionArray = [
  38             h('button',
  39                 {
  40                     on: {
  41                         click: () => {
  42                             if (this.mode == "human")
  43                                 return; //no newgame while playing
  44                             if (this.seek)
  45                                 delete localStorage["newgame"]; //cancel game seek
  46                             else
  47                             {
  48                                 localStorage["newgame"] = variant;
  49                                 this.newGame("human");
  50                             }
  51                             this.seek = !this.seek;
  52                         }
  53                     },
  54                     attrs: { "aria-label": 'New game VS human' },
  55                     'class': {
  56                         "tooltip": true,
  57                         "seek": this.seek,
  58                         "playing": playingHuman,
  59                     },
  60                 },
  61                 [h('i', { 'class': { "material-icons": true } }, "accessibility")]),
  62             h('button',
  63                 {
  64                     on: {
  65                         click: () => {
  66                             if (this.mode == "human")
  67                                 return; //no newgame while playing
  68                             this.newGame("computer");
  69                         }
  70                     },
  71                     attrs: { "aria-label": 'New game VS computer' },
  72                     'class': {
  73                         "tooltip":true,
  74                         "playing": playingComp,
  75                     },
  76                 },
  77                 [h('i', { 'class': { "material-icons": true } }, "computer")])
  78         ];
  79         if (!!this.vr)
  80         {
  81             if (this.mode == "human")
  82             {
  83                 let connectedIndic = h(
  84                     'div',
  85                     {
  86                         "class": {
  87                             "connected": this.oppConnected,
  88                             "disconnected": !this.oppConnected,
  89                         },
  90                     }
  91                 );
  92                 elementArray.push(connectedIndic);
  93             }
  94             let choices = h('div',
  95                 {
  96                     attrs: { "id": "choices" },
  97                     'class': { 'row': true },
  98                     style: {
  99                         //"position": "relative",
 100                         "display": this.choices.length>0?"block":"none",
 101                         "top": "-" + ((sizeY/2)*squareWidth+squareWidth/2) + "px",
 102                         "width": (this.choices.length * squareWidth) + "px",
 103                         "height": squareWidth + "px",
 104                     },
 105                 },
 106                 this.choices.map( m => { //a "choice" is a move
 107                     return h('div',
 108                         {
 109                             'class': { 'board': true },
 110                             style: {
 111                                 'width': (100/this.choices.length) + "%",
 112                                 'padding-bottom': (100/this.choices.length) + "%",
 113                             },
 114                         },
 115                         [h('img',
 116                             {
 117                                 attrs: { "src": '/images/pieces/' + VariantRules.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
 118                                 'class': { 'choice-piece': true, 'board': true },
 119                                 on: { "click": e => { this.play(m); this.choices=[]; } },
 120                             })
 121                         ]
 122                     );
 123                 })
 124             );
 125             // Create board element (+ reserves if needed by variant or mode)
 126             let gameDiv = h('div',
 127                 {
 128                     'class': { 'game': true },
 129                 },
 130                 [_.range(sizeX).map(i => {
 131                     let ci = this.mycolor=='w' ? i : sizeX-i-1;
 132                     return h(
 133                         'div',
 134                         {
 135                             'class': {
 136                                 'row': true,
 137                             },
 138                             style: { 'opacity': this.choices.length>0?"0.5":"1" },
 139                         },
 140                         _.range(sizeY).map(j => {
 141                             let cj = this.mycolor=='w' ? j : sizeY-j-1;
 142                             let elems = [];
 143                             if (this.vr.board[ci][cj] != VariantRules.EMPTY)
 144                             {
 145                                 elems.push(
 146                                     h(
 147                                         'img',
 148                                         {
 149                                             'class': {
 150                                                 'piece': true,
 151                                                 'ghost': !!this.selectedPiece && this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
 152                                             },
 153                                             attrs: {
 154                                                 src: "/images/pieces/" + VariantRules.getPpath(this.vr.board[ci][cj]) + ".svg",
 155                                             },
 156                                         }
 157                                     )
 158                                 );
 159                             }
 160                             if (hintSquares[ci][cj])
 161                             {
 162                                 elems.push(
 163                                     h(
 164                                         'img',
 165                                         {
 166                                             'class': {
 167                                                 'mark-square': true,
 168                                             },
 169                                             attrs: {
 170                                                 src: "/images/mark.svg",
 171                                             },
 172                                         }
 173                                     )
 174                                 );
 175                             }
 176                             const lm = this.vr.lastMove;
 177                             const highlight = !!lm && _.isMatch(lm.end, {x:ci,y:cj});
 178                             return h(
 179                                 'div',
 180                                 {
 181                                     'class': {
 182                                         'board': true,
 183                                         'light-square': !highlight && (i+j)%2==0,
 184                                         'dark-square': !highlight && (i+j)%2==1,
 185                                         'highlight': highlight,
 186                                         'incheck': incheckSq[ci][cj],
 187                                     },
 188                                     attrs: {
 189                                         id: this.getSquareId({x:ci,y:cj}),
 190                                     },
 191                                 },
 192                                 elems
 193                             );
 194                         })
 195                     );
 196                 }), choices]
 197             );
 198             actionArray.push(
 199                 h('button',
 200                     {
 201                         on: { click: this.resign },
 202                         attrs: { "aria-label": 'Resign' },
 203                         'class': { "tooltip":true },
 204                     },
 205                     [h('i', { 'class': { "material-icons": true } }, "flag")])
 206             );
 207             elementArray.push(gameDiv);
 208     //          if (!!vr.reserve)
 209     //          {
 210     //              let reserve = h('div',
 211     //                  {'class':{'game':true}}, [
 212     //                      h('div',
 213     //                          { 'class': { 'row': true }},
 214     //                          [
 215     //                              h('div',
 216     //                                  {'class':{'board':true}},
 217     //                                  [h('img',{'class':{"piece":true},attrs:{"src":"/images/pieces/wb.svg"}})]
 218     //                              )
 219     //                          ]
 220     //                      )
 221     //                  ],
 222     //              );
 223     //              elementArray.push(reserve);
 224     //          }
 225             let eogMessage = "Unfinished";
 226             switch (this.score)
 227             {
 228                 case "1-0":
 229                     eogMessage = "White win";
 230                     break;
 231                 case "0-1":
 232                     eogMessage = "Black win";
 233                     break;
 234                 case "1/2":
 235                     eogMessage = "Draw";
 236                     break;
 237             }
 238             let elemsOfEog =
 239             [
 240                 h('label',
 241                     {
 242                         attrs: { "for": "modal-control" },
 243                         "class": { "modal-close": true },
 244                     }
 245                 ),
 246                 h('h3',
 247                     {
 248                         "class": { "section": true },
 249                         domProps: { innerHTML: eogMessage },
 250                     }
 251                 )
 252             ];
 253             if (this.score != "*")
 254             {
 255                 elemsOfEog.push(
 256                     h('p', //'textarea', //TODO: selectable!
 257                         {
 258                             domProps: { innerHTML: this.vr.getPGN(this.mycolor, this.score, this.fenStart) },
 259                             //attrs: { "readonly": true },
 260                         }
 261                     )
 262                 );
 263             }
 264             const modalEog = [
 265                 h('input',
 266                     {
 267                         attrs: { "id": "modal-control", type: "checkbox" },
 268                         "class": { "modal": true },
 269                     }),
 270                 h('div',
 271                     {
 272                         attrs: { "role": "dialog", "aria-labelledby": "dialog-title" },
 273                     },
 274                     [
 275                         h('div',
 276                             {
 277                                 "class": { "card": true, "smallpad": true },
 278                             },
 279                             elemsOfEog
 280                         )
 281                     ]
 282                 )
 283             ];
 284             elementArray = elementArray.concat(modalEog);
 285         }
 286         const modalNewgame = [
 287             h('input',
 288                 {
 289                     attrs: { "id": "modal-control2", type: "checkbox" },
 290                     "class": { "modal": true },
 291                 }),
 292             h('div',
 293                 {
 294                     attrs: { "role": "dialog", "aria-labelledby": "dialog-title" },
 295                 },
 296                 [
 297                     h('div',
 298                         {
 299                             "class": { "card": true, "smallpad": true },
 300                         },
 301                         [
 302                             h('label',
 303                                 {
 304                                     attrs: { "id": "close-newgame", "for": "modal-control2" },
 305                                     "class": { "modal-close": true },
 306                                 }
 307                             ),
 308                             h('h3',
 309                                 {
 310                                     "class": { "section": true },
 311                                     domProps: { innerHTML: "New game" },
 312                                 }
 313                             ),
 314                             h('p',
 315                                 {
 316                                     "class": { "section": true },
 317                                     domProps: { innerHTML: "Waiting for opponent..." },
 318                                 }
 319                             )
 320                         ]
 321                     )
 322                 ]
 323             )
 324         ];
 325         elementArray = elementArray.concat(modalNewgame);
 326         const actions = h('div',
 327             {
 328                 attrs: { "id": "actions" },
 329                 'class': { 'text-center': true },
 330             },
 331             actionArray
 332         );
 333         elementArray.push(actions);
 334         return h(
 335             'div',
 336             {
 337                 'class': {
 338                     "col-sm-12":true,
 339                     "col-md-8":true,
 340                     "col-md-offset-2":true,
 341                     "col-lg-6":true,
 342                     "col-lg-offset-3":true,
 343                 },
 344                 // NOTE: click = mousedown + mouseup --> what about smartphone?!
 345                 on: {
 346                     mousedown: this.mousedown,
 347                     mousemove: this.mousemove,
 348                     mouseup: this.mouseup,
 349                     touchdown: this.mousedown,
 350                     touchmove: this.mousemove,
 351                     touchup: this.mouseup,
 352                 },
 353             },
 354             elementArray
 355         );
 356     },
 357     created: function() {
 358         const url = socketUrl;
 359         const continuation = (localStorage.getItem("variant") === variant);
 360         this.myid = continuation
 361             ? localStorage.getItem("myid")
 362             // random enough (TODO: function)
 363             : (Date.now().toString(36) + Math.random().toString(36).substr(2, 7)).toUpperCase();
 364         this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 365         const socketOpenListener = () => {
 366             if (continuation)
 367             {
 368                 // TODO: check FEN integrity with opponent
 369                 const fen = localStorage.getItem("fen");
 370                 const mycolor = localStorage.getItem("mycolor");
 371                 const oppid = localStorage.getItem("oppid");
 372                 const moves = JSON.parse(localStorage.getItem("moves"));
 373                 this.newGame("human", fen, mycolor, oppid, moves, true);
 374                 // Send ping to server, which answers pong if opponent is connected
 375                 this.conn.send(JSON.stringify({code:"ping", oppid:this.oppId}));
 376             }
 377             else if (localStorage.getItem("newgame") === variant)
 378             {
 379                 // New game request has been cancelled on disconnect
 380                 this.seek = true;
 381                 this.newGame("human");
 382             }
 383         };
 384         const socketMessageListener = msg => {
 385             const data = JSON.parse(msg.data);
 386             switch (data.code)
 387             {
 388                 case "newgame": //opponent found
 389                     this.newGame("human", data.fen, data.color, data.oppid); //oppid: opponent socket ID
 390                     break;
 391                 case "newmove": //..he played!
 392                     this.play(data.move, "animate");
 393                     break;
 394                 case "pong": //sent when opponent stayed online after we disconnected
 395                     this.oppConnected = true;
 396                     break;
 397                 case "resign": //..you won!
 398                     this.endGame(this.mycolor=="w"?"1-0":"0-1");
 399                     break;
 400                 // TODO: also use (dis)connect info to count online players
 401                 case "connect":
 402                 case "disconnect":
 403                     if (this.mode == "human" && this.oppid == data.id)
 404                         this.oppConnected = (data.code == "connect");
 405                     break;
 406             }
 407         };
 408         const socketCloseListener = () => {
 409             console.log("Lost connection -- reconnect");
 410             this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 411             this.conn.addEventListener('open', socketOpenListener);
 412             this.conn.addEventListener('message', socketMessageListener);
 413             this.conn.addEventListener('close', socketCloseListener);
 414         };
 415         this.conn.onopen = socketOpenListener;
 416         this.conn.onmessage = socketMessageListener;
 417         this.conn.onclose = socketCloseListener;
 418     },
 419     methods: {
 420         endGame: function(score) {
 421             this.score = score;
 422             let modalBox = document.getElementById("modal-control");
 423             modalBox.checked = true;
 424             //setTimeout(() => { modalBox.checked = false; }, 2000); //disabled, to show PGN
 425             if (this.mode == "human")
 426                 this.clearStorage();
 427             this.mode = "idle";
 428             this.oppid = "";
 429         },
 430         resign: function() {
 431             if (this.mode == "human" && this.oppConnected)
 432             {
 433                 try {
 434                     this.conn.send(JSON.stringify({code: "resign", oppid: this.oppid}));
 435                 } catch (INVALID_STATE_ERR) {
 436                     return; //resign failed for some reason...
 437                 }
 438             }
 439             this.endGame(this.mycolor=="w"?"0-1":"1-0");
 440         },
 441         setStorage: function() {
 442             localStorage.setItem("myid", this.myid);
 443             localStorage.setItem("variant", variant);
 444             localStorage.setItem("mycolor", this.mycolor);
 445             localStorage.setItem("oppid", this.oppid);
 446             localStorage.setItem("fenStart", this.fenStart);
 447             localStorage.setItem("moves", JSON.stringify(this.vr.moves));
 448             localStorage.setItem("fen", this.vr.getFen());
 449         },
 450         updateStorage: function() {
 451             localStorage.setItem("moves", JSON.stringify(this.vr.moves));
 452             localStorage.setItem("fen", this.vr.getFen());
 453         },
 454         clearStorage: function() {
 455             delete localStorage["variant"];
 456             delete localStorage["myid"];
 457             delete localStorage["mycolor"];
 458             delete localStorage["oppid"];
 459             delete localStorage["fenStart"];
 460             delete localStorage["fen"];
 461             delete localStorage["moves"];
 462         },
 463         newGame: function(mode, fenInit, color, oppId, moves, continuation) {
 464             const fen = fenInit || VariantRules.GenRandInitFen();
 465             console.log(fen); //DEBUG
 466             this.score = "*";
 467             if (mode=="human" && !oppId)
 468             {
 469                 // Send game request and wait..
 470                 this.clearStorage(); //in case of
 471                 try {
 472                     this.conn.send(JSON.stringify({code:"newgame", fen:fen}));
 473                 } catch (INVALID_STATE_ERR) {
 474                     return; //nothing achieved
 475                 }
 476                 let modalBox = document.getElementById("modal-control2");
 477                 modalBox.checked = true;
 478                 setTimeout(() => { modalBox.checked = false; }, 2000);
 479                 return;
 480             }
 481             this.vr = new VariantRules(fen, moves || []);
 482             this.mode = mode;
 483             this.fenStart = continuation
 484                 ? localStorage.getItem("fenStart")
 485                 : fen.split(" ")[0]; //Only the position matters
 486             if (mode=="human")
 487             {
 488                 // Opponent found!
 489                 if (!continuation)
 490                 {
 491                     // Playing sound fails on game continuation:
 492                     new Audio("/sounds/newgame.mp3").play();
 493                     document.getElementById("modal-control2").checked = false;
 494                 }
 495                 this.oppid = oppId;
 496                 this.oppConnected = true;
 497                 this.mycolor = color;
 498                 this.seek = false;
 499                 if (!!moves && moves.length > 0) //imply continuation
 500                 {
 501                     const oppCol = this.vr.turn;
 502                     const lastMove = moves[moves.length-1];
 503                     this.vr.undo(lastMove, "ingame");
 504                     this.incheck = this.vr.getCheckSquares(lastMove, oppCol);
 505                     this.vr.play(lastMove, "ingame");
 506                 }
 507                 delete localStorage["newgame"];
 508                 this.setStorage(); //in case of interruptions
 509             }
 510             else //against computer
 511             {
 512                 this.mycolor = Math.random() < 0.5 ? 'w' : 'b';
 513                 if (this.mycolor == 'b')
 514                     setTimeout(this.playComputerMove, 500);
 515             }
 516         },
 517         playComputerMove: function() {
 518             const compColor = this.mycolor=='w' ? 'b' : 'w';
 519             const compMove = this.vr.getComputerMove(compColor);
 520             // HACK: avoid selecting elements before they appear on page:
 521             setTimeout(() => this.play(compMove, "animate"), 500);
 522         },
 523         // Get the identifier of a HTML table cell from its numeric coordinates o.x,o.y.
 524         getSquareId: function(o) {
 525             // NOTE: a separator is required to allow any size of board
 526             return  "sq-" + o.x + "-" + o.y;
 527         },
 528         // Inverse function
 529         getSquareFromId: function(id) {
 530             let idParts = id.split('-');
 531             return [parseInt(idParts[1]), parseInt(idParts[2])];
 532         },
 533         mousedown: function(e) {
 534             e = e || window.event;
 535             e.preventDefault(); //disable native drag & drop
 536             if (!this.selectedPiece && e.target.classList.contains("piece"))
 537             {
 538                 // Next few lines to center the piece on mouse cursor
 539                 let rect = e.target.parentNode.getBoundingClientRect();
 540                 this.start = {
 541                     x: rect.x + rect.width/2,
 542                     y: rect.y + rect.width/2,
 543                     id: e.target.parentNode.id
 544                 };
 545                 this.selectedPiece = e.target.cloneNode();
 546                 this.selectedPiece.style.position = "absolute";
 547                 this.selectedPiece.style.top = 0;
 548                 this.selectedPiece.style.display = "inline-block";
 549                 this.selectedPiece.style.zIndex = 3000;
 550                 let startSquare = this.getSquareFromId(e.target.parentNode.id);
 551                 this.possibleMoves = this.vr.canIplay(this.mycolor,startSquare)
 552                     ? this.vr.getPossibleMovesFrom(startSquare)
 553                     : [];
 554                 e.target.parentNode.appendChild(this.selectedPiece);
 555             }
 556         },
 557         mousemove: function(e) {
 558             if (!this.selectedPiece)
 559                 return;
 560             e = e || window.event;
 561             // If there is an active element, move it around
 562             if (!!this.selectedPiece)
 563             {
 564                 this.selectedPiece.style.left = (e.clientX-this.start.x) + "px";
 565                 this.selectedPiece.style.top = (e.clientY-this.start.y) + "px";
 566             }
 567         },
 568         mouseup: function(e) {
 569             if (!this.selectedPiece)
 570                 return;
 571             e = e || window.event;
 572             // Read drop target (or parentElement, parentNode... if type == "img")
 573             this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coordinates
 574             let landing = document.elementFromPoint(e.clientX, e.clientY);
 575             this.selectedPiece.style.zIndex = 3000;
 576             while (landing.tagName == "IMG") //classList.contains(piece) fails because of mark/highlight
 577                 landing = landing.parentNode;
 578             if (this.start.id == landing.id) //a click: selectedPiece and possibleMoves already filled
 579                 return;
 580             // OK: process move attempt
 581             let endSquare = this.getSquareFromId(landing.id);
 582             let moves = this.findMatchingMoves(endSquare);
 583             this.possibleMoves = [];
 584             if (moves.length > 1)
 585                 this.choices = moves;
 586             else if (moves.length==1)
 587                 this.play(moves[0]);
 588             // Else: impossible move
 589             this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 590             delete this.selectedPiece;
 591             this.selectedPiece = null;
 592         },
 593         findMatchingMoves: function(endSquare) {
 594             // Run through moves list and return the matching set (if promotions...)
 595             let moves = [];
 596             this.possibleMoves.forEach(function(m) {
 597                 if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
 598                     moves.push(m);
 599             });
 600             return moves;
 601         },
 602         animateMove: function(move) {
 603             let startSquare = document.getElementById(this.getSquareId(move.start));
 604             let endSquare = document.getElementById(this.getSquareId(move.end));
 605             let rectStart = startSquare.getBoundingClientRect();
 606             let rectEnd = endSquare.getBoundingClientRect();
 607             let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
 608             let movingPiece = document.querySelector("#" + this.getSquareId(move.start) + " > img.piece");
 609             // HACK for animation (otherwise with positive translate, image slides "under background"...)
 610             // Possible improvement: just alter squares on the piece's way...
 611             squares = document.getElementsByClassName("board");
 612             for (let i=0; i<squares.length; i++)
 613             {
 614                 let square = squares.item(i);
 615                 if (square.id != this.getSquareId(move.start))
 616                     square.style.zIndex = "-1";
 617             }
 618             movingPiece.style.transform = "translate(" + translation.x + "px," + translation.y + "px)";
 619             movingPiece.style.transitionDuration = "0.2s";
 620             movingPiece.style.zIndex = "3000";
 621             setTimeout( () => {
 622                 for (let i=0; i<squares.length; i++)
 623                     squares.item(i).style.zIndex = "auto";
 624                 movingPiece.style = {}; //required e.g. for 0-0 with KR swap
 625                 this.play(move);
 626             }, 200);
 627         },
 628         play: function(move, programmatic) {
 629             if (!!programmatic) //computer or human opponent
 630             {
 631                 this.animateMove(move);
 632                 return;
 633             }
 634             const oppCol = this.vr.getOppCol(this.vr.turn);
 635             this.incheck = this.vr.getCheckSquares(move, oppCol); //is opponent in check?
 636             // Not programmatic, or animation is over
 637             if (this.mode == "human" && this.vr.turn == this.mycolor)
 638             {
 639                 if (!this.oppConnected)
 640                     return; //abort move if opponent is gone
 641                 try {
 642                     this.conn.send(JSON.stringify({code:"newmove", move:move, oppid:this.oppid}));
 643                 } catch(INVALID_STATE_ERR) {
 644                     return; //abort also if sending failed
 645                 }
 646             }
 647             new Audio("/sounds/chessmove1.mp3").play();
 648             this.vr.play(move, "ingame");
 649             if (this.mode == "human")
 650                 this.updateStorage(); //after our moves and opponent moves
 651             const eog = this.vr.checkGameOver(this.vr.turn);
 652             if (eog != "*")
 653                 this.endGame(eog);
 654             else if (this.mode == "computer" && this.vr.turn != this.mycolor)
 655                 setTimeout(this.playComputerMove, 500);
 656         },
 657     },
 658 })