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