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         const smallScreen = (screen.width <= 420);
  26         // Precompute hints squares to facilitate rendering
  27         let hintSquares = doubleArray(sizeX, sizeY, false);
  28         this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
  29         // Also precompute in-check squares
  30         let incheckSq = doubleArray(sizeX, sizeY, false);
  31         this.incheck.forEach(sq => { incheckSq[sq[0]][sq[1]] = true; });
  32         let elementArray = [];
  33         let actionArray = [];
  34         actionArray.push(
  35             h('button',
  36             {
  37                 on: { click: this.clickGameSeek },
  38                 attrs: { "aria-label": 'New online game' },
  39                 'class': {
  40                     "tooltip": true,
  41                     "bottom": true, //display below
  42                     "seek": this.seek,
  43                     "playing": this.mode == "human",
  44                     "small": smallScreen,
  45                 },
  46             },
  47             [h('i', { 'class': { "material-icons": true } }, "accessibility")])
  48         );
  49         if (["idle","computer"].includes(this.mode))
  50         {
  51             actionArray.push(
  52                 h('button',
  53                 {
  54                     on: { click: this.clickComputerGame },
  55                     attrs: { "aria-label": 'New game VS computer' },
  56                     'class': {
  57                         "tooltip":true,
  58                         "bottom": true,
  59                         "playing": this.mode == "computer",
  60                         "small": smallScreen,
  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                         "small": smallScreen,
  78                     },
  79                 },
  80                 [h('i', { 'class': { "material-icons": true } }, "people")])
  81             );
  82         }
  83         if (!!this.vr)
  84         {
  85             const square00 = document.getElementById("sq-0-0");
  86             const squareWidth = !!square00
  87                 ? parseFloat(window.getComputedStyle(square00).width.slice(0,-2))
  88                 : 0;
  89             const indicWidth = (squareWidth>0 ? squareWidth/2 : 20);
  90             if (this.mode == "human")
  91             {
  92                 let connectedIndic = h(
  93                     'div',
  94                     {
  95                         "class": {
  96                             "topindicator": true,
  97                             "indic-left": true,
  98                             "connected": this.oppConnected,
  99                             "disconnected": !this.oppConnected,
 100                         },
 101                         style: {
 102                             "width": indicWidth + "px",
 103                             "height": indicWidth + "px",
 104                         },
 105                     }
 106                 );
 107                 elementArray.push(connectedIndic);
 108             }
 109             let turnIndic = h(
 110                 'div',
 111                 {
 112                     "class": {
 113                         "topindicator": true,
 114                         "indic-right": true,
 115                         "white-turn": this.vr.turn=="w",
 116                         "black-turn": this.vr.turn=="b",
 117                     },
 118                     style: {
 119                         "width": indicWidth + "px",
 120                         "height": indicWidth + "px",
 121                     },
 122                 }
 123             );
 124             elementArray.push(turnIndic);
 125             let expertSwitch = h(
 126                 'button',
 127                 {
 128                     on: { click: this.toggleExpertMode },
 129                     attrs: { "aria-label": 'Toggle expert mode' },
 130                     style: { "padding-top": "0", "margin-top": "0" },
 131                     'class': {
 132                         "tooltip":true,
 133                         "topindicator": true,
 134                         "indic-right": true,
 135                         "expert-switch": true,
 136                         "expert-mode": this.expert,
 137                         "small": smallScreen,
 138                     },
 139                 },
 140                 [h('i', { 'class': { "material-icons": true } }, "visibility_off")]
 141             );
 142             elementArray.push(expertSwitch);
 143             let choices = h('div',
 144                 {
 145                     attrs: { "id": "choices" },
 146                     'class': { 'row': true },
 147                     style: {
 148                         "display": this.choices.length>0?"block":"none",
 149                         "top": "-" + ((sizeY/2)*squareWidth+squareWidth/2) + "px",
 150                         "width": (this.choices.length * squareWidth) + "px",
 151                         "height": squareWidth + "px",
 152                     },
 153                 },
 154                 this.choices.map( m => { //a "choice" is a move
 155                     return h('div',
 156                         {
 157                             'class': {
 158                                 'board': true,
 159                                 ['board'+sizeY]: true,
 160                             },
 161                             style: {
 162                                 'width': (100/this.choices.length) + "%",
 163                                 'padding-bottom': (100/this.choices.length) + "%",
 164                             },
 165                         },
 166                         [h('img',
 167                             {
 168                                 attrs: { "src": '/images/pieces/' +
 169                                     VariantRules.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
 170                                 'class': { 'choice-piece': true },
 171                                 on: { "click": e => { this.play(m); this.choices=[]; } },
 172                             })
 173                         ]
 174                     );
 175                 })
 176             );
 177             // Create board element (+ reserves if needed by variant or mode)
 178             let gameDiv = h('div',
 179                 {
 180                     'class': { 'game': true },
 181                 },
 182                 [_.range(sizeX).map(i => {
 183                     let ci = this.mycolor=='w' ? i : sizeX-i-1;
 184                     return h(
 185                         'div',
 186                         {
 187                             'class': {
 188                                 'row': true,
 189                             },
 190                             style: { 'opacity': this.choices.length>0?"0.5":"1" },
 191                         },
 192                         _.range(sizeY).map(j => {
 193                             let cj = this.mycolor=='w' ? j : sizeY-j-1;
 194                             let elems = [];
 195                             if (this.vr.board[ci][cj] != VariantRules.EMPTY)
 196                             {
 197                                 elems.push(
 198                                     h(
 199                                         'img',
 200                                         {
 201                                             'class': {
 202                                                 'piece': true,
 203                                                 'ghost': !!this.selectedPiece
 204                                                     && this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
 205                                             },
 206                                             attrs: {
 207                                                 src: "/images/pieces/" +
 208                                                     VariantRules.getPpath(this.vr.board[ci][cj]) + ".svg",
 209                                             },
 210                                         }
 211                                     )
 212                                 );
 213                             }
 214                             if (!this.expert && hintSquares[ci][cj])
 215                             {
 216                                 elems.push(
 217                                     h(
 218                                         'img',
 219                                         {
 220                                             'class': {
 221                                                 'mark-square': true,
 222                                             },
 223                                             attrs: {
 224                                                 src: "/images/mark.svg",
 225                                             },
 226                                         }
 227                                     )
 228                                 );
 229                             }
 230                             const lm = this.vr.lastMove;
 231                             const showLight = !this.expert &&
 232                                 (this.mode!="idle" || this.cursor==this.vr.moves.length);
 233                             return h(
 234                                 'div',
 235                                 {
 236                                     'class': {
 237                                         'board': true,
 238                                         ['board'+sizeY]: true,
 239                                         'light-square': (i+j)%2==0,
 240                                         'dark-square': (i+j)%2==1,
 241                                         'highlight': showLight && !!lm && _.isMatch(lm.end, {x:ci,y:cj}),
 242                                         'incheck': showLight && incheckSq[ci][cj],
 243                                     },
 244                                     attrs: {
 245                                         id: this.getSquareId({x:ci,y:cj}),
 246                                     },
 247                                 },
 248                                 elems
 249                             );
 250                         })
 251                     );
 252                 }), choices]
 253             );
 254             if (this.mode != "idle")
 255             {
 256                 actionArray.push(
 257                     h('button',
 258                         {
 259                             on: { click: this.resign },
 260                             attrs: { "aria-label": 'Resign' },
 261                             'class': {
 262                                 "tooltip":true,
 263                                 "bottom": true,
 264                                 "small": smallScreen,
 265                             },
 266                         },
 267                         [h('i', { 'class': { "material-icons": true } }, "flag")])
 268                 );
 269             }
 270             else if (this.vr.moves.length > 0)
 271             {
 272                 // A game finished, and another is not started yet: allow navigation
 273                 actionArray = actionArray.concat([
 274                     h('button',
 275                         {
 276                             style: { "margin-left": "30px" },
 277                             on: { click: e => this.undo() },
 278                             attrs: { "aria-label": 'Undo' },
 279                             "class": { "small": smallScreen },
 280                         },
 281                         [h('i', { 'class': { "material-icons": true } }, "fast_rewind")]),
 282                     h('button',
 283                         {
 284                             on: { click: e => this.play() },
 285                             attrs: { "aria-label": 'Play' },
 286                             "class": { "small": smallScreen },
 287                         },
 288                         [h('i', { 'class': { "material-icons": true } }, "fast_forward")]),
 289                     ]
 290                 );
 291             }
 292             if (this.mode == "friend")
 293             {
 294                 actionArray = actionArray.concat(
 295                 [
 296                     h('button',
 297                         {
 298                             style: { "margin-left": "30px" },
 299                             on: { click: this.undoInGame },
 300                             attrs: { "aria-label": 'Undo' },
 301                             "class": { "small": smallScreen },
 302                         },
 303                         [h('i', { 'class': { "material-icons": true } }, "undo")]
 304                     ),
 305                     h('button',
 306                         {
 307                             on: { click: () => { this.mycolor = this.vr.getOppCol(this.mycolor) } },
 308                             attrs: { "aria-label": 'Flip' },
 309                             "class": { "small": smallScreen },
 310                         },
 311                         [h('i', { 'class': { "material-icons": true } }, "cached")]
 312                     ),
 313                 ]);
 314             }
 315             elementArray.push(gameDiv);
 316             if (!!this.vr.reserve)
 317             {
 318                 const shiftIdx = (this.mycolor=="w" ? 0 : 1);
 319                 let myReservePiecesArray = [];
 320                 for (let i=0; i<VariantRules.RESERVE_PIECES.length; i++)
 321                 {
 322                     myReservePiecesArray.push(h('div',
 323                     {
 324                         'class': {'board':true, ['board'+sizeY]:true},
 325                         attrs: { id: this.getSquareId({x:sizeX+shiftIdx,y:i}) }
 326                     },
 327                     [
 328                         h('img',
 329                         {
 330                             'class': {"piece":true},
 331                             attrs: {
 332                                 "src": "/images/pieces/" +
 333                                     this.vr.getReservePpath(this.mycolor,i) + ".svg",
 334                             }
 335                         }),
 336                         h('sup',
 337                             {style: { "padding-left":"40%"} },
 338                             [ this.vr.reserve[this.mycolor][VariantRules.RESERVE_PIECES[i]] ]
 339                         )
 340                     ]));
 341                 }
 342                 let oppReservePiecesArray = [];
 343                 const oppCol = this.vr.getOppCol(this.mycolor);
 344                 for (let i=0; i<VariantRules.RESERVE_PIECES.length; i++)
 345                 {
 346                     oppReservePiecesArray.push(h('div',
 347                     {
 348                         'class': {'board':true, ['board'+sizeY]:true},
 349                         attrs: { id: this.getSquareId({x:sizeX+(1-shiftIdx),y:i}) }
 350                     },
 351                     [
 352                         h('img',
 353                         {
 354                             'class': {"piece":true},
 355                             attrs: {
 356                                 "src": "/images/pieces/" +
 357                                     this.vr.getReservePpath(oppCol,i) + ".svg",
 358                             }
 359                         }),
 360                         h('sup',
 361                             {style: { "padding-left":"40%"} },
 362                             [ this.vr.reserve[oppCol][VariantRules.RESERVE_PIECES[i]] ]
 363                         )
 364                     ]));
 365                 }
 366                 let reserves = h('div',
 367                     {
 368                         'class':{'game':true},
 369                         style: {"margin-bottom": "20px"},
 370                     },
 371                     [
 372                         h('div',
 373                             {
 374                                 'class': { 'row': true },
 375                                 style: {"margin-bottom": "15px"},
 376                             },
 377                             myReservePiecesArray
 378                         ),
 379                         h('div',
 380                             { 'class': { 'row': true }},
 381                             oppReservePiecesArray
 382                         )
 383                     ]
 384                 );
 385                 elementArray.push(reserves);
 386             }
 387             const eogMessage = this.getEndgameMessage(this.score);
 388             const modalEog = [
 389                 h('input',
 390                     {
 391                         attrs: { "id": "modal-eog", type: "checkbox" },
 392                         "class": { "modal": true },
 393                     }),
 394                 h('div',
 395                     {
 396                         attrs: { "role": "dialog", "aria-labelledby": "modal-eog" },
 397                     },
 398                     [
 399                         h('div',
 400                             {
 401                                 "class": { "card": true, "smallpad": true },
 402                             },
 403                             [
 404                                 h('label',
 405                                     {
 406                                         attrs: { "for": "modal-eog" },
 407                                         "class": { "modal-close": true },
 408                                     }
 409                                 ),
 410                                 h('h3',
 411                                     {
 412                                         "class": { "section": true },
 413                                         domProps: { innerHTML: eogMessage },
 414                                     }
 415                                 )
 416                             ]
 417                         )
 418                     ]
 419                 )
 420             ];
 421             elementArray = elementArray.concat(modalEog);
 422         }
 423         const modalNewgame = [
 424             h('input',
 425                 {
 426                     attrs: { "id": "modal-newgame", type: "checkbox" },
 427                     "class": { "modal": true },
 428                 }),
 429             h('div',
 430                 {
 431                     attrs: { "role": "dialog", "aria-labelledby": "modal-newgame" },
 432                 },
 433                 [
 434                     h('div',
 435                         {
 436                             "class": { "card": true, "smallpad": true },
 437                         },
 438                         [
 439                             h('label',
 440                                 {
 441                                     attrs: { "id": "close-newgame", "for": "modal-newgame" },
 442                                     "class": { "modal-close": true },
 443                                 }
 444                             ),
 445                             h('h3',
 446                                 {
 447                                     "class": { "section": true },
 448                                     domProps: { innerHTML: "New game" },
 449                                 }
 450                             ),
 451                             h('p',
 452                                 {
 453                                     "class": { "section": true },
 454                                     domProps: { innerHTML: "Waiting for opponent..." },
 455                                 }
 456                             )
 457                         ]
 458                     )
 459                 ]
 460             )
 461         ];
 462         elementArray = elementArray.concat(modalNewgame);
 463         const modalFenEdit = [
 464             h('input',
 465                 {
 466                     attrs: { "id": "modal-fenedit", type: "checkbox" },
 467                     "class": { "modal": true },
 468                 }),
 469             h('div',
 470                 {
 471                     attrs: { "role": "dialog", "aria-labelledby": "modal-fenedit" },
 472                 },
 473                 [
 474                     h('div',
 475                         {
 476                             "class": { "card": true, "smallpad": true },
 477                         },
 478                         [
 479                             h('label',
 480                                 {
 481                                     attrs: { "id": "close-fenedit", "for": "modal-fenedit" },
 482                                     "class": { "modal-close": true },
 483                                 }
 484                             ),
 485                             h('h3',
 486                                 {
 487                                     "class": { "section": true },
 488                                     domProps: { innerHTML: "Position + flags (FEN):" },
 489                                 }
 490                             ),
 491                             h('input',
 492                                 {
 493                                     attrs: {
 494                                         "id": "input-fen",
 495                                         type: "text",
 496                                         value: VariantRules.GenRandInitFen(),
 497                                     },
 498                                 }
 499                             ),
 500                             h('button',
 501                                 {
 502                                     on: { click:
 503                                         () => {
 504                                             const fen = document.getElementById("input-fen").value;
 505                                             document.getElementById("modal-fenedit").checked = false;
 506                                             this.newGame("friend", fen);
 507                                         }
 508                                     },
 509                                     domProps: { innerHTML: "Ok" },
 510                                 }
 511                             ),
 512                             h('button',
 513                                 {
 514                                     on: { click:
 515                                         () => {
 516                                             document.getElementById("input-fen").value =
 517                                                 VariantRules.GenRandInitFen();
 518                                         }
 519                                     },
 520                                     domProps: { innerHTML: "Random" },
 521                                 }
 522                             ),
 523                         ]
 524                     )
 525                 ]
 526             )
 527         ];
 528         elementArray = elementArray.concat(modalFenEdit);
 529         const actions = h('div',
 530             {
 531                 attrs: { "id": "actions" },
 532                 'class': { 'text-center': true },
 533             },
 534             actionArray
 535         );
 536         elementArray.push(actions);
 537         if (this.score != "*")
 538         {
 539             elementArray.push(
 540                 h('div',
 541                     { attrs: { id: "pgn-div" } },
 542                     [
 543                         h('a',
 544                             {
 545                                 attrs: {
 546                                     id: "download",
 547                                     href: "#",
 548                                 }
 549                             }
 550                         ),
 551                         h('p',
 552                             {
 553                                 attrs: { id: "pgn-game" },
 554                                 on: { click: this.download },
 555                                 domProps: { innerHTML: this.pgnTxt }
 556                             }
 557                         )
 558                     ]
 559                 )
 560             );
 561         }
 562         else if (this.mode != "idle")
 563         {
 564             // Show current FEN
 565             elementArray.push(
 566                 h('div',
 567                     { attrs: { id: "fen-div" } },
 568                     [
 569                         h('p',
 570                             {
 571                                 attrs: { id: "fen-string" },
 572                                 domProps: { innerHTML: this.vr.getFen() }
 573                             }
 574                         )
 575                     ]
 576                 )
 577             );
 578         }
 579         return h(
 580             'div',
 581             {
 582                 'class': {
 583                     "col-sm-12":true,
 584                     "col-md-8":true,
 585                     "col-md-offset-2":true,
 586                     "col-lg-6":true,
 587                     "col-lg-offset-3":true,
 588                 },
 589                 // NOTE: click = mousedown + mouseup
 590                 on: {
 591                     mousedown: this.mousedown,
 592                     mousemove: this.mousemove,
 593                     mouseup: this.mouseup,
 594                     touchstart: this.mousedown,
 595                     touchmove: this.mousemove,
 596                     touchend: this.mouseup,
 597                 },
 598             },
 599             elementArray
 600         );
 601     },
 602     created: function() {
 603         const url = socketUrl;
 604         const continuation = (localStorage.getItem("variant") === variant);
 605         this.myid = continuation ? localStorage.getItem("myid") : getRandString();
 606         if (!continuation)
 607         {
 608             // HACK: play a small silent sound to allow "new game" sound later if tab not focused
 609             new Audio("/sounds/silent.mp3").play().then(() => {}).catch(err => {});
 610         }
 611         this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 612         const socketOpenListener = () => {
 613             if (continuation)
 614             {
 615                 const fen = localStorage.getItem("fen");
 616                 const mycolor = localStorage.getItem("mycolor");
 617                 const oppid = localStorage.getItem("oppid");
 618                 const moves = JSON.parse(localStorage.getItem("moves"));
 619                 this.newGame("human", fen, mycolor, oppid, moves, true);
 620                 // Send ping to server (answer pong if opponent is connected)
 621                 this.conn.send(JSON.stringify({code:"ping",oppid:this.oppid}));
 622             }
 623             else if (localStorage.getItem("newgame") === variant)
 624             {
 625                 // New game request has been cancelled on disconnect
 626                 this.newGame("human", undefined, undefined, undefined, undefined, "reconnect");
 627             }
 628         };
 629         const socketMessageListener = msg => {
 630             const data = JSON.parse(msg.data);
 631             switch (data.code)
 632             {
 633                 case "newgame": //opponent found
 634                     this.newGame("human", data.fen, data.color, data.oppid); //oppid: opponent socket ID
 635                     break;
 636                 case "newmove": //..he played!
 637                     this.play(data.move, "animate");
 638                     break;
 639                 case "pong": //received if we sent a ping (game still alive on our side)
 640                     this.oppConnected = true;
 641                     const L = this.vr.moves.length;
 642                     // Send our "last state" informations to opponent
 643                     this.conn.send(JSON.stringify({
 644                         code:"lastate",
 645                         oppid:this.oppid,
 646                         lastMove:L>0?this.vr.moves[L-1]:undefined,
 647                         movesCount:L,
 648                     }));
 649                     break;
 650                 case "lastate": //got opponent infos about last move (we might have resigned)
 651                     if (this.mode!="human" || this.oppid!=data.oppid)
 652                     {
 653                         // OK, we resigned
 654                         this.conn.send(JSON.stringify({
 655                             code:"lastate",
 656                             oppid:this.oppid,
 657                             lastMove:undefined,
 658                             movesCount:-1,
 659                         }));
 660                     }
 661                     else if (data.movesCount < 0)
 662                     {
 663                         // OK, he resigned
 664                         this.endGame(this.mycolor=="w"?"1-0":"0-1");
 665                     }
 666                     else if (data.movesCount < this.vr.moves.length)
 667                     {
 668                         // We must tell last move to opponent
 669                         const L = this.vr.moves.length;
 670                         this.conn.send(JSON.stringify({
 671                             code:"lastate",
 672                             oppid:this.oppid,
 673                             lastMove:this.vr.moves[L-1],
 674                             movesCount:L,
 675                         }));
 676                     }
 677                     else if (data.movesCount > this.vr.moves.length) //just got last move from him
 678                         this.play(data.lastMove, "animate");
 679                     break;
 680                 case "resign": //..you won!
 681                     this.endGame(this.mycolor=="w"?"1-0":"0-1");
 682                     break;
 683                 // TODO: also use (dis)connect info to count online players?
 684                 case "connect":
 685                 case "disconnect":
 686                     if (this.mode == "human" && this.oppid == data.id)
 687                         this.oppConnected = (data.code == "connect");
 688                     break;
 689             }
 690         };
 691         const socketCloseListener = () => {
 692             this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 693             this.conn.addEventListener('open', socketOpenListener);
 694             this.conn.addEventListener('message', socketMessageListener);
 695             this.conn.addEventListener('close', socketCloseListener);
 696         };
 697         this.conn.onopen = socketOpenListener;
 698         this.conn.onmessage = socketMessageListener;
 699         this.conn.onclose = socketCloseListener;
 700         // Listen to keyboard left/right to navigate in game
 701         document.onkeydown = event => {
 702             if (this.mode == "idle" && !!this.vr && this.vr.moves.length > 0
 703                 && [37,39].includes(event.keyCode))
 704             {
 705                 event.preventDefault();
 706                 if (event.keyCode == 37) //Back
 707                     this.undo();
 708                 else //Forward (39)
 709                     this.play();
 710             }
 711         };
 712     },
 713     methods: {
 714         download: function() {
 715             let content = document.getElementById("pgn-game").innerHTML;
 716             content = content.replace(/<br>/g, "\n");
 717             // Prepare and trigger download link
 718             let downloadAnchor = document.getElementById("download");
 719             downloadAnchor.setAttribute("download", "game.pgn");
 720             downloadAnchor.href = "data:text/plain;charset=utf-8," + encodeURIComponent(content);
 721             downloadAnchor.click();
 722         },
 723         endGame: function(score) {
 724             this.score = score;
 725             let modalBox = document.getElementById("modal-eog");
 726             modalBox.checked = true;
 727             // Variants may have special PGN structure (so next function isn't defined here)
 728             this.pgnTxt = this.vr.getPGN(this.mycolor, this.score, this.fenStart, this.mode);
 729             setTimeout(() => { modalBox.checked = false; }, 2000);
 730             if (this.mode == "human")
 731                 this.clearStorage();
 732             this.mode = "idle";
 733             this.cursor = this.vr.moves.length; //to navigate in finished game
 734             this.oppid = "";
 735         },
 736         getEndgameMessage: function(score) {
 737             let eogMessage = "Unfinished";
 738             switch (this.score)
 739             {
 740                 case "1-0":
 741                     eogMessage = "White win";
 742                     break;
 743                 case "0-1":
 744                     eogMessage = "Black win";
 745                     break;
 746                 case "1/2":
 747                     eogMessage = "Draw";
 748                     break;
 749             }
 750             return eogMessage;
 751         },
 752         setStorage: function() {
 753             localStorage.setItem("myid", this.myid);
 754             localStorage.setItem("variant", variant);
 755             localStorage.setItem("mycolor", this.mycolor);
 756             localStorage.setItem("oppid", this.oppid);
 757             localStorage.setItem("fenStart", this.fenStart);
 758             localStorage.setItem("moves", JSON.stringify(this.vr.moves));
 759             localStorage.setItem("fen", this.vr.getFen());
 760         },
 761         updateStorage: function() {
 762             localStorage.setItem("moves", JSON.stringify(this.vr.moves));
 763             localStorage.setItem("fen", this.vr.getFen());
 764         },
 765         clearStorage: function() {
 766             delete localStorage["variant"];
 767             delete localStorage["myid"];
 768             delete localStorage["mycolor"];
 769             delete localStorage["oppid"];
 770             delete localStorage["fenStart"];
 771             delete localStorage["fen"];
 772             delete localStorage["moves"];
 773         },
 774         // HACK because mini-css tooltips are persistent after click...
 775         getRidOfTooltip: function(elt) {
 776             elt.style.visibility = "hidden";
 777             setTimeout(() => { elt.style.visibility="visible"; }, 100);
 778         },
 779         clickGameSeek: function(e) {
 780             this.getRidOfTooltip(e.currentTarget);
 781             if (this.mode == "human")
 782                 return; //no newgame while playing
 783             if (this.seek)
 784             {
 785                 this.conn.send(JSON.stringify({code:"cancelnewgame"}));
 786                 delete localStorage["newgame"]; //cancel game seek
 787                 this.seek = false;
 788             }
 789             else
 790                 this.newGame("human");
 791         },
 792         clickComputerGame: function(e) {
 793             this.getRidOfTooltip(e.currentTarget);
 794             if (this.mode == "human")
 795                 return; //no newgame while playing
 796             this.newGame("computer");
 797         },
 798         clickFriendGame: function(e) {
 799             this.getRidOfTooltip(e.currentTarget);
 800             document.getElementById("modal-fenedit").checked = true;
 801         },
 802         toggleExpertMode: function(e) {
 803             this.getRidOfTooltip(e.currentTarget);
 804             this.expert = !this.expert;
 805             setCookie("expert", this.expert ? "1" : "0");
 806         },
 807         resign: function(e) {
 808             this.getRidOfTooltip(e.currentTarget);
 809             if (this.mode == "human" && this.oppConnected)
 810             {
 811                 try {
 812                     this.conn.send(JSON.stringify({code: "resign", oppid: this.oppid}));
 813                 } catch (INVALID_STATE_ERR) {
 814                     return; //socket is not ready (and not yet reconnected)
 815                 }
 816             }
 817             this.endGame(this.mycolor=="w"?"0-1":"1-0");
 818         },
 819         newGame: function(mode, fenInit, color, oppId, moves, continuation) {
 820             const fen = fenInit || VariantRules.GenRandInitFen();
 821             console.log(fen); //DEBUG
 822             if (mode=="human" && !oppId)
 823             {
 824                 const storageVariant = localStorage.getItem("variant");
 825                 if (!!storageVariant && storageVariant !== variant)
 826                 {
 827                     alert("Finish your " + storageVariant + " game first!");
 828                     return;
 829                 }
 830                 // Send game request and wait..
 831                 localStorage["newgame"] = variant;
 832                 this.seek = true;
 833                 this.clearStorage(); //in case of
 834                 try {
 835                     this.conn.send(JSON.stringify({code:"newgame", fen:fen}));
 836                 } catch (INVALID_STATE_ERR) {
 837                     return; //nothing achieved
 838                 }
 839                 if (continuation !== "reconnect") //TODO: bad HACK...
 840                 {
 841                     let modalBox = document.getElementById("modal-newgame");
 842                     modalBox.checked = true;
 843                     setTimeout(() => { modalBox.checked = false; }, 2000);
 844                 }
 845                 return;
 846             }
 847             this.gameId = getRandString();
 848             this.vr = new VariantRules(fen, moves || []);
 849             this.score = "*";
 850             this.pgnTxt = ""; //redundant with this.score = "*", but cleaner
 851             this.mode = mode;
 852             this.incheck = []; //in case of
 853             this.fenStart = (continuation ? localStorage.getItem("fenStart") : fen);
 854             if (mode=="human")
 855             {
 856                 // Opponent found!
 857                 if (!continuation)
 858                 {
 859                     // Not playing sound on game continuation:
 860                     new Audio("/sounds/newgame.mp3").play().then(() => {}).catch(err => {});
 861                     document.getElementById("modal-newgame").checked = false;
 862                 }
 863                 this.oppid = oppId;
 864                 this.oppConnected = true;
 865                 this.mycolor = color;
 866                 this.seek = false;
 867                 if (!!moves && moves.length > 0) //imply continuation
 868                 {
 869                     const lastMove = moves[moves.length-1];
 870                     this.vr.undo(lastMove);
 871                     this.incheck = this.vr.getCheckSquares(lastMove);
 872                     this.vr.play(lastMove, "ingame");
 873                 }
 874                 delete localStorage["newgame"];
 875                 this.setStorage(); //in case of interruptions
 876             }
 877             else if (mode == "computer")
 878             {
 879                 this.mycolor = Math.random() < 0.5 ? 'w' : 'b';
 880                 if (this.mycolor == 'b')
 881                     setTimeout(this.playComputerMove, 500);
 882             }
 883             //else: against a (IRL) friend: nothing more to do
 884         },
 885         playComputerMove: function() {
 886             const timeStart = Date.now();
 887             const nbMoves = this.vr.moves.length; //using played moves to know if search finished
 888             const gameId = this.gameId; //to know if game was reset before timer end
 889             setTimeout(
 890                 () => {
 891                     if (gameId != this.gameId)
 892                         return; //game stopped
 893                     const L = this.vr.moves.length;
 894                     if (nbMoves == L || !this.vr.moves[L-1].notation) //move search didn't finish
 895                         this.vr.shouldReturn = true;
 896                 }, 5000);
 897             const compMove = this.vr.getComputerMove();
 898             // (first move) HACK: avoid selecting elements before they appear on page:
 899             const delay = Math.max(500-(Date.now()-timeStart), 0);
 900             setTimeout(() => this.play(compMove, "animate"), delay);
 901         },
 902         // Get the identifier of a HTML table cell from its numeric coordinates o.x,o.y.
 903         getSquareId: function(o) {
 904             // NOTE: a separator is required to allow any size of board
 905             return  "sq-" + o.x + "-" + o.y;
 906         },
 907         // Inverse function
 908         getSquareFromId: function(id) {
 909             let idParts = id.split('-');
 910             return [parseInt(idParts[1]), parseInt(idParts[2])];
 911         },
 912         mousedown: function(e) {
 913             e = e || window.event;
 914             let ingame = false;
 915             let elem = e.target;
 916             while (!ingame && elem !== null)
 917             {
 918                 if (elem.classList.contains("game"))
 919                 {
 920                     ingame = true;
 921                     break;
 922                 }
 923                 elem = elem.parentElement;
 924             }
 925             if (!ingame) //let default behavior (click on button...)
 926                 return;
 927             e.preventDefault(); //disable native drag & drop
 928             if (!this.selectedPiece && e.target.classList.contains("piece"))
 929             {
 930                 // Next few lines to center the piece on mouse cursor
 931                 let rect = e.target.parentNode.getBoundingClientRect();
 932                 this.start = {
 933                     x: rect.x + rect.width/2,
 934                     y: rect.y + rect.width/2,
 935                     id: e.target.parentNode.id
 936                 };
 937                 this.selectedPiece = e.target.cloneNode();
 938                 this.selectedPiece.style.position = "absolute";
 939                 this.selectedPiece.style.top = 0;
 940                 this.selectedPiece.style.display = "inline-block";
 941                 this.selectedPiece.style.zIndex = 3000;
 942                 let startSquare = this.getSquareFromId(e.target.parentNode.id);
 943                 const iCanPlay = this.mode!="idle"
 944                     && (this.mode=="friend" || this.vr.canIplay(this.mycolor,startSquare));
 945                 this.possibleMoves = iCanPlay ? this.vr.getPossibleMovesFrom(startSquare) : [];
 946                 // Next line add moving piece just after current image (required for Crazyhouse reserve)
 947                 e.target.parentNode.insertBefore(this.selectedPiece, e.target.nextSibling);
 948             }
 949         },
 950         mousemove: function(e) {
 951             if (!this.selectedPiece)
 952                 return;
 953             e = e || window.event;
 954             // If there is an active element, move it around
 955             if (!!this.selectedPiece)
 956             {
 957                 const [offsetX,offsetY] = !!e.clientX
 958                     ? [e.clientX,e.clientY] //desktop browser
 959                     : [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
 960                 this.selectedPiece.style.left = (offsetX-this.start.x) + "px";
 961                 this.selectedPiece.style.top = (offsetY-this.start.y) + "px";
 962             }
 963         },
 964         mouseup: function(e) {
 965             if (!this.selectedPiece)
 966                 return;
 967             e = e || window.event;
 968             // Read drop target (or parentElement, parentNode... if type == "img")
 969             this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coordinates
 970             const [offsetX,offsetY] = !!e.clientX
 971                 ? [e.clientX,e.clientY]
 972                 : [e.changedTouches[0].pageX, e.changedTouches[0].pageY];
 973             let landing = document.elementFromPoint(offsetX, offsetY);
 974             this.selectedPiece.style.zIndex = 3000;
 975             while (landing.tagName == "IMG") //classList.contains(piece) fails because of mark/highlight
 976                 landing = landing.parentNode;
 977             if (this.start.id == landing.id) //a click: selectedPiece and possibleMoves already filled
 978                 return;
 979             // OK: process move attempt
 980             let endSquare = this.getSquareFromId(landing.id);
 981             let moves = this.findMatchingMoves(endSquare);
 982             this.possibleMoves = [];
 983             if (moves.length > 1)
 984                 this.choices = moves;
 985             else if (moves.length==1)
 986                 this.play(moves[0]);
 987             // Else: impossible move
 988             this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 989             delete this.selectedPiece;
 990             this.selectedPiece = null;
 991         },
 992         findMatchingMoves: function(endSquare) {
 993             // Run through moves list and return the matching set (if promotions...)
 994             let moves = [];
 995             this.possibleMoves.forEach(function(m) {
 996                 if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
 997                     moves.push(m);
 998             });
 999             return moves;
1000         },
1001         animateMove: function(move) {
1002             let startSquare = document.getElementById(this.getSquareId(move.start));
1003             let endSquare = document.getElementById(this.getSquareId(move.end));
1004             let rectStart = startSquare.getBoundingClientRect();
1005             let rectEnd = endSquare.getBoundingClientRect();
1006             let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
1007             let movingPiece =
1008                 document.querySelector("#" + this.getSquareId(move.start) + " > img.piece");
1009             // HACK for animation (with positive translate, image slides "under background"...)
1010             // Possible improvement: just alter squares on the piece's way...
1011             squares = document.getElementsByClassName("board");
1012             for (let i=0; i<squares.length; i++)
1013             {
1014                 let square = squares.item(i);
1015                 if (square.id != this.getSquareId(move.start))
1016                     square.style.zIndex = "-1";
1017             }
1018             movingPiece.style.transform = "translate(" + translation.x + "px," + translation.y + "px)";
1019             movingPiece.style.transitionDuration = "0.2s";
1020             movingPiece.style.zIndex = "3000";
1021             setTimeout( () => {
1022                 for (let i=0; i<squares.length; i++)
1023                     squares.item(i).style.zIndex = "auto";
1024                 movingPiece.style = {}; //required e.g. for 0-0 with KR swap
1025                 this.play(move);
1026             }, 200);
1027         },
1028         play: function(move, programmatic) {
1029             if (!move)
1030             {
1031                 // Navigate after game is over
1032                 if (this.cursor >= this.vr.moves.length)
1033                     return; //already at the end
1034                 move = this.vr.moves[this.cursor++];
1035             }
1036             if (!!programmatic) //computer or human opponent
1037             {
1038                 this.animateMove(move);
1039                 return;
1040             }
1041             // Not programmatic, or animation is over
1042             if (this.mode == "human" && this.vr.turn == this.mycolor)
1043                 this.conn.send(JSON.stringify({code:"newmove", move:move, oppid:this.oppid}));
1044             new Audio("/sounds/chessmove1.mp3").play().then(() => {}).catch(err => {});
1045             if (this.mode != "idle")
1046             {
1047                 this.incheck = this.vr.getCheckSquares(move); //is opponent in check?
1048                 this.vr.play(move, "ingame");
1049             }
1050             else
1051             {
1052                 VariantRules.PlayOnBoard(this.vr.board, move);
1053                 this.$forceUpdate(); //TODO: ?!
1054             }
1055             if (this.mode == "human")
1056                 this.updateStorage(); //after our moves and opponent moves
1057             if (this.mode != "idle")
1058             {
1059                 const eog = this.vr.checkGameOver();
1060                 if (eog != "*")
1061                     this.endGame(eog);
1062             }
1063             if (this.mode == "computer" && this.vr.turn != this.mycolor)
1064                 setTimeout(this.playComputerMove, 500);
1065         },
1066         undo: function() {
1067             // Navigate after game is over
1068             if (this.cursor == 0)
1069                 return; //already at the beginning
1070             if (this.cursor == this.vr.moves.length)
1071                 this.incheck = []; //in case of...
1072             const move = this.vr.moves[--this.cursor];
1073             VariantRules.UndoOnBoard(this.vr.board, move);
1074             this.$forceUpdate(); //TODO: ?!
1075         },
1076         undoInGame: function() {
1077             const lm = this.vr.lastMove;
1078             if (!!lm)
1079                 this.vr.undo(lm);
1080         },
1081     },
1082 })