public/javascripts/components/game.js

   1 Vue.component('my-game', {
   2     data: function() {
   3         return {
   4             vr: null, //object to check moves, store them, FEN..
   5             mycolor: "w",
   6             possibleMoves: [], //filled after each valid click/dragstart
   7             choices: [], //promotion pieces, or checkered captures... (contain possible pieces)
   8             start: {}, //pixels coordinates + id of starting square (click or drag)
   9             selectedPiece: null, //moving piece (or clicked piece)
  10             conn: null, //socket messages
  11             score: "*", //'*' means 'unfinished'
  12             mode: "idle", //human, friend, computer or idle (when not playing)
  13             oppid: "", //opponent ID in case of HH game
  14             oppConnected: false,
  15             seek: false,
  16             fenStart: "",
  17             incheck: [],
  18             pgnTxt: "",
  19             expert: getCookie("expert") === "1" ? true : false,
  20             gameId: "", //used to limit computer moves' time
  21         };
  22     },
  23     render(h) {
  24         const [sizeX,sizeY] = VariantRules.size;
  25         // Precompute hints squares to facilitate rendering
  26         let hintSquares = doubleArray(sizeX, sizeY, false);
  27         this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
  28         // Also precompute in-check squares
  29         let incheckSq = doubleArray(sizeX, sizeY, false);
  30         this.incheck.forEach(sq => { incheckSq[sq[0]][sq[1]] = true; });
  31         let elementArray = [];
  32         let actionArray = [];
  33         if (["idle","human"].includes(this.mode))
  34         {
  35             actionArray.push(
  36                 h('button',
  37                 {
  38                     on: { click: this.clickGameSeek },
  39                     attrs: { "aria-label": 'New online game' },
  40                     'class': {
  41                         "tooltip": true,
  42                         "bottom": true, //display below
  43                         "seek": this.seek,
  44                         "playing": this.mode == "human",
  45                     },
  46                 },
  47                 [h('i', { 'class': { "material-icons": true } }, "accessibility")])
  48             );
  49         }
  50         if (["idle","computer"].includes(this.mode))
  51         {
  52             actionArray.push(
  53                 h('button',
  54                 {
  55                     on: { click: this.clickComputerGame },
  56                     attrs: { "aria-label": 'New game VS computer' },
  57                     'class': {
  58                         "tooltip":true,
  59                         "bottom": true,
  60                         "playing": this.mode == "computer",
  61                     },
  62                 },
  63                 [h('i', { 'class': { "material-icons": true } }, "computer")])
  64             );
  65         }
  66         if (["idle","friend"].includes(this.mode))
  67         {
  68             actionArray.push(
  69                 h('button',
  70                 {
  71                     on: { click: this.clickFriendGame },
  72                     attrs: { "aria-label": 'New IRL game' },
  73                     'class': {
  74                         "tooltip":true,
  75                         "bottom": true,
  76                         "playing": this.mode == "friend",
  77                     },
  78                 },
  79                 [h('i', { 'class': { "material-icons": true } }, "people")])
  80             );
  81         }
  82         if (!!this.vr)
  83         {
  84             const square00 = document.getElementById("sq-0-0");
  85             const squareWidth = !!square00
  86                 ? parseFloat(window.getComputedStyle(square00).width.slice(0,-2))
  87                 : 0;
  88             const indicWidth = (squareWidth>0 ? squareWidth/2 : 20);
  89             if (this.mode == "human")
  90             {
  91                 let connectedIndic = h(
  92                     'div',
  93                     {
  94                         "class": {
  95                             "topindicator": true,
  96                             "indic-left": true,
  97                             "connected": this.oppConnected,
  98                             "disconnected": !this.oppConnected,
  99                         },
 100                         style: {
 101                             "width": indicWidth + "px",
 102                             "height": indicWidth + "px",
 103                         },
 104                     }
 105                 );
 106                 elementArray.push(connectedIndic);
 107             }
 108             let turnIndic = h(
 109                 'div',
 110                 {
 111                     "class": {
 112                         "topindicator": true,
 113                         "indic-right": true,
 114                         "white-turn": this.vr.turn=="w",
 115                         "black-turn": this.vr.turn=="b",
 116                     },
 117                     style: {
 118                         "width": indicWidth + "px",
 119                         "height": indicWidth + "px",
 120                     },
 121                 }
 122             );
 123             elementArray.push(turnIndic);
 124             let expertSwitch = h(
 125                 'button',
 126                 {
 127                     on: { click: this.toggleExpertMode },
 128                     attrs: { "aria-label": 'Toggle expert mode' },
 129                     'class': {
 130                         "tooltip":true,
 131                         "topindicator": true,
 132                         "indic-right": true,
 133                         "expert-switch": true,
 134                         "expert-mode": this.expert,
 135                     },
 136                 },
 137                 [h('i', { 'class': { "material-icons": true } }, "visibility_off")]
 138             );
 139             elementArray.push(expertSwitch);
 140             let choices = h('div',
 141                 {
 142                     attrs: { "id": "choices" },
 143                     'class': { 'row': true },
 144                     style: {
 145                         "display": this.choices.length>0?"block":"none",
 146                         "top": "-" + ((sizeY/2)*squareWidth+squareWidth/2) + "px",
 147                         "width": (this.choices.length * squareWidth) + "px",
 148                         "height": squareWidth + "px",
 149                     },
 150                 },
 151                 this.choices.map( m => { //a "choice" is a move
 152                     return h('div',
 153                         {
 154                             'class': {
 155                                 'board': true,
 156                                 ['board'+sizeY]: true,
 157                             },
 158                             style: {
 159                                 'width': (100/this.choices.length) + "%",
 160                                 'padding-bottom': (100/this.choices.length) + "%",
 161                             },
 162                         },
 163                         [h('img',
 164                             {
 165                                 attrs: { "src": '/images/pieces/' +
 166                                     VariantRules.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
 167                                 'class': { 'choice-piece': true },
 168                                 on: { "click": e => { this.play(m); this.choices=[]; } },
 169                             })
 170                         ]
 171                     );
 172                 })
 173             );
 174             // Create board element (+ reserves if needed by variant or mode)
 175             let gameDiv = h('div',
 176                 {
 177                     'class': { 'game': true },
 178                 },
 179                 [_.range(sizeX).map(i => {
 180                     let ci = this.mycolor=='w' ? i : sizeX-i-1;
 181                     return h(
 182                         'div',
 183                         {
 184                             'class': {
 185                                 'row': true,
 186                             },
 187                             style: { 'opacity': this.choices.length>0?"0.5":"1" },
 188                         },
 189                         _.range(sizeY).map(j => {
 190                             let cj = this.mycolor=='w' ? j : sizeY-j-1;
 191                             let elems = [];
 192                             if (this.vr.board[ci][cj] != VariantRules.EMPTY)
 193                             {
 194                                 elems.push(
 195                                     h(
 196                                         'img',
 197                                         {
 198                                             'class': {
 199                                                 'piece': true,
 200                                                 'ghost': !!this.selectedPiece
 201                                                     && this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
 202                                             },
 203                                             attrs: {
 204                                                 src: "/images/pieces/" +
 205                                                     VariantRules.getPpath(this.vr.board[ci][cj]) + ".svg",
 206                                             },
 207                                         }
 208                                     )
 209                                 );
 210                             }
 211                             if (!this.expert && hintSquares[ci][cj])
 212                             {
 213                                 elems.push(
 214                                     h(
 215                                         'img',
 216                                         {
 217                                             'class': {
 218                                                 'mark-square': true,
 219                                             },
 220                                             attrs: {
 221                                                 src: "/images/mark.svg",
 222                                             },
 223                                         }
 224                                     )
 225                                 );
 226                             }
 227                             const lm = this.vr.lastMove;
 228                             const showLight = !this.expert &&
 229                                 (this.mode!="idle" || this.cursor==this.vr.moves.length);
 230                             return h(
 231                                 'div',
 232                                 {
 233                                     'class': {
 234                                         'board': true,
 235                                         ['board'+sizeY]: true,
 236                                         'light-square': (i+j)%2==0,
 237                                         'dark-square': (i+j)%2==1,
 238                                         'highlight': showLight && !!lm && _.isMatch(lm.end, {x:ci,y:cj}),
 239                                         'incheck': showLight && incheckSq[ci][cj],
 240                                     },
 241                                     attrs: {
 242                                         id: this.getSquareId({x:ci,y:cj}),
 243                                     },
 244                                 },
 245                                 elems
 246                             );
 247                         })
 248                     );
 249                 }), choices]
 250             );
 251             if (this.mode != "idle")
 252             {
 253                 actionArray.push(
 254                     h('button',
 255                         {
 256                             on: { click: this.resign },
 257                             attrs: { "aria-label": 'Resign' },
 258                             'class': {
 259                                 "tooltip":true,
 260                                 "bottom": true,
 261                             },
 262                         },
 263                         [h('i', { 'class': { "material-icons": true } }, "flag")])
 264                 );
 265             }
 266             else if (this.vr.moves.length > 0)
 267             {
 268                 // A game finished, and another is not started yet: allow navigation
 269                 actionArray = actionArray.concat([
 270                     h('button',
 271                         {
 272                             style: { "margin-left": "30px" },
 273                             on: { click: e => this.undo() },
 274                             attrs: { "aria-label": 'Undo' },
 275                         },
 276                         [h('i', { 'class': { "material-icons": true } }, "fast_rewind")]),
 277                     h('button',
 278                         {
 279                             on: { click: e => this.play() },
 280                             attrs: { "aria-label": 'Play' },
 281                         },
 282                         [h('i', { 'class': { "material-icons": true } }, "fast_forward")]),
 283                     ]
 284                 );
 285             }
 286             if (this.mode == "friend")
 287             {
 288                 actionArray = actionArray.concat(
 289                 [
 290                     h('button',
 291                         {
 292                             style: { "margin-left": "30px" },
 293                             on: { click: this.undoInGame },
 294                             attrs: { "aria-label": 'Undo' },
 295                         },
 296                         [h('i', { 'class': { "material-icons": true } }, "undo")]
 297                     ),
 298                     h('button',
 299                         {
 300                             on: { click: () => { this.mycolor = this.vr.getOppCol(this.mycolor) } },
 301                             attrs: { "aria-label": 'Flip' },
 302                         },
 303                         [h('i', { 'class': { "material-icons": true } }, "cached")]
 304                     ),
 305                 ]);
 306             }
 307             elementArray.push(gameDiv);
 308             if (!!this.vr.reserve)
 309             {
 310                 const shiftIdx = (this.mycolor=="w" ? 0 : 1);
 311                 let myReservePiecesArray = [];
 312                 for (let i=0; i<VariantRules.RESERVE_PIECES.length; i++)
 313                 {
 314                     myReservePiecesArray.push(h('div',
 315                     {
 316                         'class': {'board':true, ['board'+sizeY]:true},
 317                         attrs: { id: this.getSquareId({x:sizeX+shiftIdx,y:i}) }
 318                     },
 319                     [
 320                         h('img',
 321                         {
 322                             'class': {"piece":true},
 323                             attrs: {
 324                                 "src": "/images/pieces/" +
 325                                     this.vr.getReservePpath(this.mycolor,i) + ".svg",
 326                             }
 327                         }),
 328                         h('sup',
 329                             {style: { "padding-left":"40%"} },
 330                             [ this.vr.reserve[this.mycolor][VariantRules.RESERVE_PIECES[i]] ]
 331                         )
 332                     ]));
 333                 }
 334                 let oppReservePiecesArray = [];
 335                 const oppCol = this.vr.getOppCol(this.mycolor);
 336                 for (let i=0; i<VariantRules.RESERVE_PIECES.length; i++)
 337                 {
 338                     oppReservePiecesArray.push(h('div',
 339                     {
 340                         'class': {'board':true, ['board'+sizeY]:true},
 341                         attrs: { id: this.getSquareId({x:sizeX+(1-shiftIdx),y:i}) }
 342                     },
 343                     [
 344                         h('img',
 345                         {
 346                             'class': {"piece":true},
 347                             attrs: {
 348                                 "src": "/images/pieces/" +
 349                                     this.vr.getReservePpath(oppCol,i) + ".svg",
 350                             }
 351                         }),
 352                         h('sup',
 353                             {style: { "padding-left":"40%"} },
 354                             [ this.vr.reserve[oppCol][VariantRules.RESERVE_PIECES[i]] ]
 355                         )
 356                     ]));
 357                 }
 358                 let reserves = h('div',
 359                     {
 360                         'class':{'game':true},
 361                         style: {"margin-bottom": "20px"},
 362                     },
 363                     [
 364                         h('div',
 365                             {
 366                                 'class': { 'row': true },
 367                                 style: {"margin-bottom": "15px"},
 368                             },
 369                             myReservePiecesArray
 370                         ),
 371                         h('div',
 372                             { 'class': { 'row': true }},
 373                             oppReservePiecesArray
 374                         )
 375                     ]
 376                 );
 377                 elementArray.push(reserves);
 378             }
 379             const eogMessage = this.getEndgameMessage(this.score);
 380             const modalEog = [
 381                 h('input',
 382                     {
 383                         attrs: { "id": "modal-eog", type: "checkbox" },
 384                         "class": { "modal": true },
 385                     }),
 386                 h('div',
 387                     {
 388                         attrs: { "role": "dialog", "aria-labelledby": "modal-eog" },
 389                     },
 390                     [
 391                         h('div',
 392                             {
 393                                 "class": { "card": true, "smallpad": true },
 394                             },
 395                             [
 396                                 h('label',
 397                                     {
 398                                         attrs: { "for": "modal-eog" },
 399                                         "class": { "modal-close": true },
 400                                     }
 401                                 ),
 402                                 h('h3',
 403                                     {
 404                                         "class": { "section": true },
 405                                         domProps: { innerHTML: eogMessage },
 406                                     }
 407                                 )
 408                             ]
 409                         )
 410                     ]
 411                 )
 412             ];
 413             elementArray = elementArray.concat(modalEog);
 414         }
 415         const modalNewgame = [
 416             h('input',
 417                 {
 418                     attrs: { "id": "modal-newgame", type: "checkbox" },
 419                     "class": { "modal": true },
 420                 }),
 421             h('div',
 422                 {
 423                     attrs: { "role": "dialog", "aria-labelledby": "modal-newgame" },
 424                 },
 425                 [
 426                     h('div',
 427                         {
 428                             "class": { "card": true, "smallpad": true },
 429                         },
 430                         [
 431                             h('label',
 432                                 {
 433                                     attrs: { "id": "close-newgame", "for": "modal-newgame" },
 434                                     "class": { "modal-close": true },
 435                                 }
 436                             ),
 437                             h('h3',
 438                                 {
 439                                     "class": { "section": true },
 440                                     domProps: { innerHTML: "New game" },
 441                                 }
 442                             ),
 443                             h('p',
 444                                 {
 445                                     "class": { "section": true },
 446                                     domProps: { innerHTML: "Waiting for opponent..." },
 447                                 }
 448                             )
 449                         ]
 450                     )
 451                 ]
 452             )
 453         ];
 454         elementArray = elementArray.concat(modalNewgame);
 455         const modalFenEdit = [
 456             h('input',
 457                 {
 458                     attrs: { "id": "modal-fenedit", type: "checkbox" },
 459                     "class": { "modal": true },
 460                 }),
 461             h('div',
 462                 {
 463                     attrs: { "role": "dialog", "aria-labelledby": "modal-fenedit" },
 464                 },
 465                 [
 466                     h('div',
 467                         {
 468                             "class": { "card": true, "smallpad": true },
 469                         },
 470                         [
 471                             h('label',
 472                                 {
 473                                     attrs: { "id": "close-fenedit", "for": "modal-fenedit" },
 474                                     "class": { "modal-close": true },
 475                                 }
 476                             ),
 477                             h('h3',
 478                                 {
 479                                     "class": { "section": true },
 480                                     domProps: { innerHTML: "Position + flags (FEN):" },
 481                                 }
 482                             ),
 483                             h('input',
 484                                 {
 485                                     attrs: {
 486                                         "id": "input-fen",
 487                                         type: "text",
 488                                         value: VariantRules.GenRandInitFen(),
 489                                     },
 490                                 }
 491                             ),
 492                             h('button',
 493                                 {
 494                                     on: { click:
 495                                         () => {
 496                                             const fen = document.getElementById("input-fen").value;
 497                                             document.getElementById("modal-fenedit").checked = false;
 498                                             this.newGame("friend", fen);
 499                                         }
 500                                     },
 501                                     domProps: { innerHTML: "Ok" },
 502                                 }
 503                             ),
 504                             h('button',
 505                                 {
 506                                     on: { click:
 507                                         () => {
 508                                             document.getElementById("input-fen").value =
 509                                                 VariantRules.GenRandInitFen();
 510                                         }
 511                                     },
 512                                     domProps: { innerHTML: "Random" },
 513                                 }
 514                             ),
 515                         ]
 516                     )
 517                 ]
 518             )
 519         ];
 520         elementArray = elementArray.concat(modalFenEdit);
 521         const actions = h('div',
 522             {
 523                 attrs: { "id": "actions" },
 524                 'class': { 'text-center': true },
 525             },
 526             actionArray
 527         );
 528         elementArray.push(actions);
 529         if (this.score != "*")
 530         {
 531             elementArray.push(
 532                 h('div',
 533                     { attrs: { id: "pgn-div" } },
 534                     [
 535                         h('a',
 536                             {
 537                                 attrs: {
 538                                     id: "download",
 539                                     href: "#",
 540                                 }
 541                             }
 542                         ),
 543                         h('p',
 544                             {
 545                                 attrs: { id: "pgn-game" },
 546                                 on: { click: this.download },
 547                                 domProps: { innerHTML: this.pgnTxt }
 548                             }
 549                         )
 550                     ]
 551                 )
 552             );
 553         }
 554         else if (this.mode != "idle")
 555         {
 556             // Show current FEN
 557             elementArray.push(
 558                 h('div',
 559                     { attrs: { id: "fen-div" } },
 560                     [
 561                         h('p',
 562                             {
 563                                 attrs: { id: "fen-string" },
 564                                 domProps: { innerHTML: this.vr.getFen() }
 565                             }
 566                         )
 567                     ]
 568                 )
 569             );
 570         }
 571         return h(
 572             'div',
 573             {
 574                 'class': {
 575                     "col-sm-12":true,
 576                     "col-md-8":true,
 577                     "col-md-offset-2":true,
 578                     "col-lg-6":true,
 579                     "col-lg-offset-3":true,
 580                 },
 581                 // NOTE: click = mousedown + mouseup
 582                 on: {
 583                     mousedown: this.mousedown,
 584                     mousemove: this.mousemove,
 585                     mouseup: this.mouseup,
 586                     touchstart: this.mousedown,
 587                     touchmove: this.mousemove,
 588                     touchend: this.mouseup,
 589                 },
 590             },
 591             elementArray
 592         );
 593     },
 594     created: function() {
 595         const url = socketUrl;
 596         const continuation = (localStorage.getItem("variant") === variant);
 597         this.myid = continuation ? localStorage.getItem("myid") : getRandString();
 598         if (!continuation)
 599         {
 600             // HACK: play a small silent sound to allow "new game" sound later if tab not focused
 601             new Audio("/sounds/silent.mp3").play().then(() => {}).catch(err => {});
 602         }
 603         this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 604         const socketOpenListener = () => {
 605             if (continuation)
 606             {
 607                 const fen = localStorage.getItem("fen");
 608                 const mycolor = localStorage.getItem("mycolor");
 609                 const oppid = localStorage.getItem("oppid");
 610                 const moves = JSON.parse(localStorage.getItem("moves"));
 611                 this.newGame("human", fen, mycolor, oppid, moves, true);
 612                 // Send ping to server (answer pong if opponent is connected)
 613                 this.conn.send(JSON.stringify({code:"ping",oppid:this.oppid}));
 614             }
 615             else if (localStorage.getItem("newgame") === variant)
 616             {
 617                 // New game request has been cancelled on disconnect
 618                 this.newGame("human", undefined, undefined, undefined, undefined, "reconnect");
 619             }
 620         };
 621         const socketMessageListener = msg => {
 622             const data = JSON.parse(msg.data);
 623             switch (data.code)
 624             {
 625                 case "newgame": //opponent found
 626                     this.newGame("human", data.fen, data.color, data.oppid); //oppid: opponent socket ID
 627                     break;
 628                 case "newmove": //..he played!
 629                     this.play(data.move, "animate");
 630                     break;
 631                 case "pong": //received if we sent a ping (game still alive on our side)
 632                     this.oppConnected = true;
 633                     const L = this.vr.moves.length;
 634                     // Send our "last state" informations to opponent
 635                     this.conn.send(JSON.stringify({
 636                         code:"lastate",
 637                         oppid:this.oppid,
 638                         lastMove:L>0?this.vr.moves[L-1]:undefined,
 639                         movesCount:L,
 640                     }));
 641                     break;
 642                 case "lastate": //got opponent infos about last move (we might have resigned)
 643                     if (this.mode!="human" || this.oppid!=data.oppid)
 644                     {
 645                         // OK, we resigned
 646                         this.conn.send(JSON.stringify({
 647                             code:"lastate",
 648                             oppid:this.oppid,
 649                             lastMove:undefined,
 650                             movesCount:-1,
 651                         }));
 652                     }
 653                     else if (data.movesCount < 0)
 654                     {
 655                         // OK, he resigned
 656                         this.endGame(this.mycolor=="w"?"1-0":"0-1");
 657                     }
 658                     else if (data.movesCount < this.vr.moves.length)
 659                     {
 660                         // We must tell last move to opponent
 661                         const L = this.vr.moves.length;
 662                         this.conn.send(JSON.stringify({
 663                             code:"lastate",
 664                             oppid:this.oppid,
 665                             lastMove:this.vr.moves[L-1],
 666                             movesCount:L,
 667                         }));
 668                     }
 669                     else if (data.movesCount > this.vr.moves.length) //just got last move from him
 670                         this.play(data.lastMove, "animate");
 671                     break;
 672                 case "resign": //..you won!
 673                     this.endGame(this.mycolor=="w"?"1-0":"0-1");
 674                     break;
 675                 // TODO: also use (dis)connect info to count online players?
 676                 case "connect":
 677                 case "disconnect":
 678                     if (this.mode == "human" && this.oppid == data.id)
 679                         this.oppConnected = (data.code == "connect");
 680                     break;
 681             }
 682         };
 683         const socketCloseListener = () => {
 684             this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 685             this.conn.addEventListener('open', socketOpenListener);
 686             this.conn.addEventListener('message', socketMessageListener);
 687             this.conn.addEventListener('close', socketCloseListener);
 688         };
 689         this.conn.onopen = socketOpenListener;
 690         this.conn.onmessage = socketMessageListener;
 691         this.conn.onclose = socketCloseListener;
 692         // Listen to keyboard left/right to navigate in game
 693         document.onkeydown = event => {
 694             if (this.mode == "idle" && !!this.vr && this.vr.moves.length > 0
 695                 && [37,39].includes(event.keyCode))
 696             {
 697                 event.preventDefault();
 698                 if (event.keyCode == 37) //Back
 699                     this.undo();
 700                 else //Forward (39)
 701                     this.play();
 702             }
 703         };
 704     },
 705     methods: {
 706         download: function() {
 707             let content = document.getElementById("pgn-game").innerHTML;
 708             content = content.replace(/<br>/g, "\n");
 709             // Prepare and trigger download link
 710             let downloadAnchor = document.getElementById("download");
 711             downloadAnchor.setAttribute("download", "game.pgn");
 712             downloadAnchor.href = "data:text/plain;charset=utf-8," + encodeURIComponent(content);
 713             downloadAnchor.click();
 714         },
 715         endGame: function(score) {
 716             this.score = score;
 717             let modalBox = document.getElementById("modal-eog");
 718             modalBox.checked = true;
 719             // Variants may have special PGN structure (so next function isn't defined here)
 720             this.pgnTxt = this.vr.getPGN(this.mycolor, this.score, this.fenStart, this.mode);
 721             setTimeout(() => { modalBox.checked = false; }, 2000);
 722             if (this.mode == "human")
 723                 this.clearStorage();
 724             this.mode = "idle";
 725             this.cursor = this.vr.moves.length; //to navigate in finished game
 726             this.oppid = "";
 727         },
 728         getEndgameMessage: function(score) {
 729             let eogMessage = "Unfinished";
 730             switch (this.score)
 731             {
 732                 case "1-0":
 733                     eogMessage = "White win";
 734                     break;
 735                 case "0-1":
 736                     eogMessage = "Black win";
 737                     break;
 738                 case "1/2":
 739                     eogMessage = "Draw";
 740                     break;
 741             }
 742             return eogMessage;
 743         },
 744         setStorage: function() {
 745             localStorage.setItem("myid", this.myid);
 746             localStorage.setItem("variant", variant);
 747             localStorage.setItem("mycolor", this.mycolor);
 748             localStorage.setItem("oppid", this.oppid);
 749             localStorage.setItem("fenStart", this.fenStart);
 750             localStorage.setItem("moves", JSON.stringify(this.vr.moves));
 751             localStorage.setItem("fen", this.vr.getFen());
 752         },
 753         updateStorage: function() {
 754             localStorage.setItem("moves", JSON.stringify(this.vr.moves));
 755             localStorage.setItem("fen", this.vr.getFen());
 756         },
 757         clearStorage: function() {
 758             delete localStorage["variant"];
 759             delete localStorage["myid"];
 760             delete localStorage["mycolor"];
 761             delete localStorage["oppid"];
 762             delete localStorage["fenStart"];
 763             delete localStorage["fen"];
 764             delete localStorage["moves"];
 765         },
 766         // HACK because mini-css tooltips are persistent after click...
 767         getRidOfTooltip: function(elt) {
 768             elt.style.visibility = "hidden";
 769             setTimeout(() => { elt.style.visibility="visible"; }, 100);
 770         },
 771         clickGameSeek: function(e) {
 772             this.getRidOfTooltip(e.currentTarget);
 773             if (this.mode == "human")
 774                 return; //no newgame while playing
 775             if (this.seek)
 776             {
 777                 this.conn.send(JSON.stringify({code:"cancelnewgame"}));
 778                 delete localStorage["newgame"]; //cancel game seek
 779                 this.seek = false;
 780             }
 781             else
 782                 this.newGame("human");
 783         },
 784         clickComputerGame: function(e) {
 785             this.getRidOfTooltip(e.currentTarget);
 786             if (this.mode == "human")
 787                 return; //no newgame while playing
 788             this.newGame("computer");
 789         },
 790         clickFriendGame: function(e) {
 791             this.getRidOfTooltip(e.currentTarget);
 792             document.getElementById("modal-fenedit").checked = true;
 793         },
 794         toggleExpertMode: function(e) {
 795             this.getRidOfTooltip(e.currentTarget);
 796             this.expert = !this.expert;
 797             setCookie("expert", this.expert ? "1" : "0");
 798         },
 799         resign: function(e) {
 800             this.getRidOfTooltip(e.currentTarget);
 801             if (this.mode == "human" && this.oppConnected)
 802             {
 803                 try {
 804                     this.conn.send(JSON.stringify({code: "resign", oppid: this.oppid}));
 805                 } catch (INVALID_STATE_ERR) {
 806                     return; //socket is not ready (and not yet reconnected)
 807                 }
 808             }
 809             this.endGame(this.mycolor=="w"?"0-1":"1-0");
 810         },
 811         newGame: function(mode, fenInit, color, oppId, moves, continuation) {
 812             const fen = fenInit || VariantRules.GenRandInitFen();
 813             console.log(fen); //DEBUG
 814             if (mode=="human" && !oppId)
 815             {
 816                 const storageVariant = localStorage.getItem("variant");
 817                 if (!!storageVariant && storageVariant !== variant)
 818                 {
 819                     alert("Finish your " + storageVariant + " game first!");
 820                     return;
 821                 }
 822                 // Send game request and wait..
 823                 localStorage["newgame"] = variant;
 824                 this.seek = true;
 825                 this.clearStorage(); //in case of
 826                 try {
 827                     this.conn.send(JSON.stringify({code:"newgame", fen:fen}));
 828                 } catch (INVALID_STATE_ERR) {
 829                     return; //nothing achieved
 830                 }
 831                 if (continuation !== "reconnect") //TODO: bad HACK...
 832                 {
 833                     let modalBox = document.getElementById("modal-newgame");
 834                     modalBox.checked = true;
 835                     setTimeout(() => { modalBox.checked = false; }, 2000);
 836                 }
 837                 return;
 838             }
 839             this.gameId = getRandString();
 840             this.vr = new VariantRules(fen, moves || []);
 841             this.score = "*";
 842             this.pgnTxt = ""; //redundant with this.score = "*", but cleaner
 843             this.mode = mode;
 844             this.incheck = []; //in case of
 845             this.fenStart = (continuation ? localStorage.getItem("fenStart") : fen);
 846             if (mode=="human")
 847             {
 848                 // Opponent found!
 849                 if (!continuation)
 850                 {
 851                     // Not playing sound on game continuation:
 852                     new Audio("/sounds/newgame.mp3").play().then(() => {}).catch(err => {});
 853                     document.getElementById("modal-newgame").checked = false;
 854                 }
 855                 this.oppid = oppId;
 856                 this.oppConnected = true;
 857                 this.mycolor = color;
 858                 this.seek = false;
 859                 if (!!moves && moves.length > 0) //imply continuation
 860                 {
 861                     const lastMove = moves[moves.length-1];
 862                     this.vr.undo(lastMove);
 863                     this.incheck = this.vr.getCheckSquares(lastMove);
 864                     this.vr.play(lastMove, "ingame");
 865                 }
 866                 delete localStorage["newgame"];
 867                 this.setStorage(); //in case of interruptions
 868             }
 869             else if (mode == "computer")
 870             {
 871                 this.mycolor = Math.random() < 0.5 ? 'w' : 'b';
 872                 if (this.mycolor == 'b')
 873                     setTimeout(this.playComputerMove, 500);
 874             }
 875             //else: against a (IRL) friend: nothing more to do
 876         },
 877         playComputerMove: function() {
 878             const timeStart = Date.now();
 879             const nbMoves = this.vr.moves.length; //using played moves to know if search finished
 880             const gameId = this.gameId; //to know if game was reset before timer end
 881             setTimeout(
 882                 () => {
 883                     if (gameId != this.gameId)
 884                         return; //game stopped
 885                     const L = this.vr.moves.length;
 886                     if (nbMoves == L || !this.vr.moves[L-1].notation) //move search didn't finish
 887                         this.vr.shouldReturn = true;
 888                 }, 5000);
 889             const compMove = this.vr.getComputerMove();
 890             // (first move) HACK: avoid selecting elements before they appear on page:
 891             const delay = Math.max(500-(Date.now()-timeStart), 0);
 892             setTimeout(() => this.play(compMove, "animate"), delay);
 893         },
 894         // Get the identifier of a HTML table cell from its numeric coordinates o.x,o.y.
 895         getSquareId: function(o) {
 896             // NOTE: a separator is required to allow any size of board
 897             return  "sq-" + o.x + "-" + o.y;
 898         },
 899         // Inverse function
 900         getSquareFromId: function(id) {
 901             let idParts = id.split('-');
 902             return [parseInt(idParts[1]), parseInt(idParts[2])];
 903         },
 904         mousedown: function(e) {
 905             e = e || window.event;
 906             let ingame = false;
 907             let elem = e.target;
 908             while (!ingame && elem !== null)
 909             {
 910                 if (elem.classList.contains("game"))
 911                 {
 912                     ingame = true;
 913                     break;
 914                 }
 915                 elem = elem.parentElement;
 916             }
 917             if (!ingame) //let default behavior (click on button...)
 918                 return;
 919             e.preventDefault(); //disable native drag & drop
 920             if (!this.selectedPiece && e.target.classList.contains("piece"))
 921             {
 922                 // Next few lines to center the piece on mouse cursor
 923                 let rect = e.target.parentNode.getBoundingClientRect();
 924                 this.start = {
 925                     x: rect.x + rect.width/2,
 926                     y: rect.y + rect.width/2,
 927                     id: e.target.parentNode.id
 928                 };
 929                 this.selectedPiece = e.target.cloneNode();
 930                 this.selectedPiece.style.position = "absolute";
 931                 this.selectedPiece.style.top = 0;
 932                 this.selectedPiece.style.display = "inline-block";
 933                 this.selectedPiece.style.zIndex = 3000;
 934                 let startSquare = this.getSquareFromId(e.target.parentNode.id);
 935                 const iCanPlay = this.mode!="idle"
 936                     && (this.mode=="friend" || this.vr.canIplay(this.mycolor,startSquare));
 937                 this.possibleMoves = iCanPlay ? this.vr.getPossibleMovesFrom(startSquare) : [];
 938                 // Next line add moving piece just after current image (required for Crazyhouse reserve)
 939                 e.target.parentNode.insertBefore(this.selectedPiece, e.target.nextSibling);
 940             }
 941         },
 942         mousemove: function(e) {
 943             if (!this.selectedPiece)
 944                 return;
 945             e = e || window.event;
 946             // If there is an active element, move it around
 947             if (!!this.selectedPiece)
 948             {
 949                 const [offsetX,offsetY] = !!e.clientX
 950                     ? [e.clientX,e.clientY] //desktop browser
 951                     : [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
 952                 this.selectedPiece.style.left = (offsetX-this.start.x) + "px";
 953                 this.selectedPiece.style.top = (offsetY-this.start.y) + "px";
 954             }
 955         },
 956         mouseup: function(e) {
 957             if (!this.selectedPiece)
 958                 return;
 959             e = e || window.event;
 960             // Read drop target (or parentElement, parentNode... if type == "img")
 961             this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coordinates
 962             const [offsetX,offsetY] = !!e.clientX
 963                 ? [e.clientX,e.clientY]
 964                 : [e.changedTouches[0].pageX, e.changedTouches[0].pageY];
 965             let landing = document.elementFromPoint(offsetX, offsetY);
 966             this.selectedPiece.style.zIndex = 3000;
 967             while (landing.tagName == "IMG") //classList.contains(piece) fails because of mark/highlight
 968                 landing = landing.parentNode;
 969             if (this.start.id == landing.id) //a click: selectedPiece and possibleMoves already filled
 970                 return;
 971             // OK: process move attempt
 972             let endSquare = this.getSquareFromId(landing.id);
 973             let moves = this.findMatchingMoves(endSquare);
 974             this.possibleMoves = [];
 975             if (moves.length > 1)
 976                 this.choices = moves;
 977             else if (moves.length==1)
 978                 this.play(moves[0]);
 979             // Else: impossible move
 980             this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 981             delete this.selectedPiece;
 982             this.selectedPiece = null;
 983         },
 984         findMatchingMoves: function(endSquare) {
 985             // Run through moves list and return the matching set (if promotions...)
 986             let moves = [];
 987             this.possibleMoves.forEach(function(m) {
 988                 if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
 989                     moves.push(m);
 990             });
 991             return moves;
 992         },
 993         animateMove: function(move) {
 994             let startSquare = document.getElementById(this.getSquareId(move.start));
 995             let endSquare = document.getElementById(this.getSquareId(move.end));
 996             let rectStart = startSquare.getBoundingClientRect();
 997             let rectEnd = endSquare.getBoundingClientRect();
 998             let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
 999             let movingPiece =
1000                 document.querySelector("#" + this.getSquareId(move.start) + " > img.piece");
1001             // HACK for animation (with positive translate, image slides "under background"...)
1002             // Possible improvement: just alter squares on the piece's way...
1003             squares = document.getElementsByClassName("board");
1004             for (let i=0; i<squares.length; i++)
1005             {
1006                 let square = squares.item(i);
1007                 if (square.id != this.getSquareId(move.start))
1008                     square.style.zIndex = "-1";
1009             }
1010             movingPiece.style.transform = "translate(" + translation.x + "px," + translation.y + "px)";
1011             movingPiece.style.transitionDuration = "0.2s";
1012             movingPiece.style.zIndex = "3000";
1013             setTimeout( () => {
1014                 for (let i=0; i<squares.length; i++)
1015                     squares.item(i).style.zIndex = "auto";
1016                 movingPiece.style = {}; //required e.g. for 0-0 with KR swap
1017                 this.play(move);
1018             }, 200);
1019         },
1020         play: function(move, programmatic) {
1021             if (!move)
1022             {
1023                 // Navigate after game is over
1024                 if (this.cursor >= this.vr.moves.length)
1025                     return; //already at the end
1026                 move = this.vr.moves[this.cursor++];
1027             }
1028             if (!!programmatic) //computer or human opponent
1029             {
1030                 this.animateMove(move);
1031                 return;
1032             }
1033             // Not programmatic, or animation is over
1034             if (this.mode == "human" && this.vr.turn == this.mycolor)
1035                 this.conn.send(JSON.stringify({code:"newmove", move:move, oppid:this.oppid}));
1036             new Audio("/sounds/chessmove1.mp3").play().then(() => {}).catch(err => {});
1037             if (this.mode != "idle")
1038             {
1039                 this.incheck = this.vr.getCheckSquares(move); //is opponent in check?
1040                 this.vr.play(move, "ingame");
1041             }
1042             else
1043             {
1044                 VariantRules.PlayOnBoard(this.vr.board, move);
1045                 this.$forceUpdate(); //TODO: ?!
1046             }
1047             if (this.mode == "human")
1048                 this.updateStorage(); //after our moves and opponent moves
1049             if (this.mode != "idle")
1050             {
1051                 const eog = this.vr.checkGameOver();
1052                 if (eog != "*")
1053                     this.endGame(eog);
1054             }
1055             if (this.mode == "computer" && this.vr.turn != this.mycolor)
1056                 setTimeout(this.playComputerMove, 500);
1057         },
1058         undo: function() {
1059             // Navigate after game is over
1060             if (this.cursor == 0)
1061                 return; //already at the beginning
1062             if (this.cursor == this.vr.moves.length)
1063                 this.incheck = []; //in case of...
1064             const move = this.vr.moves[--this.cursor];
1065             VariantRules.UndoOnBoard(this.vr.board, move);
1066             this.$forceUpdate(); //TODO: ?!
1067         },
1068         undoInGame: function() {
1069             const lm = this.vr.lastMove;
1070             if (!!lm)
1071                 this.vr.undo(lm);
1072         },
1073     },
1074 })