public/javascripts/components/game.js

   1 // Game logic on a variant page
   2 Vue.component('my-game', {
   3     data: function() {
   4         return {
   5             vr: null, //object to check moves, store them, FEN..
   6             mycolor: "w",
   7             possibleMoves: [], //filled after each valid click/dragstart
   8             choices: [], //promotion pieces, or checkered captures... (as moves)
   9             start: {}, //pixels coordinates + id of starting square (click or drag)
  10             selectedPiece: null, //moving piece (or clicked piece)
  11             conn: null, //socket connection
  12             score: "*", //'*' means 'unfinished'
  13             mode: "idle", //human, friend, computer or idle (when not playing)
  14             oppid: "", //opponent ID in case of HH game
  15             oppConnected: false,
  16             seek: false,
  17             fenStart: "",
  18             incheck: [],
  19             pgnTxt: "",
  20             hints: (getCookie("hints") === "1" ? true : false),
  21             color: getCookie("color", "lichess"), //lichess, chesscom or chesstempo
  22             // sound level: 0 = no sound, 1 = sound only on newgame, 2 = always
  23             sound: parseInt(getCookie("sound", "2")),
  24         };
  25     },
  26     render(h) {
  27         const [sizeX,sizeY] = VariantRules.size;
  28         const smallScreen = (window.innerWidth <= 420);
  29         // Precompute hints squares to facilitate rendering
  30         let hintSquares = doubleArray(sizeX, sizeY, false);
  31         this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
  32         // Also precompute in-check squares
  33         let incheckSq = doubleArray(sizeX, sizeY, false);
  34         this.incheck.forEach(sq => { incheckSq[sq[0]][sq[1]] = true; });
  35         let elementArray = [];
  36         let actionArray = [];
  37         actionArray.push(
  38             h('button',
  39             {
  40                 on: { click: this.clickGameSeek },
  41                 attrs: { "aria-label": 'New online game' },
  42                 'class': {
  43                     "tooltip": true,
  44                     "bottom": true, //display below
  45                     "seek": this.seek,
  46                     "playing": this.mode == "human",
  47                     "small": smallScreen,
  48                 },
  49             },
  50             [h('i', { 'class': { "material-icons": true } }, "accessibility")])
  51         );
  52         if (["idle","computer"].includes(this.mode))
  53         {
  54             actionArray.push(
  55                 h('button',
  56                 {
  57                     on: { click: this.clickComputerGame },
  58                     attrs: { "aria-label": 'New game VS computer' },
  59                     'class': {
  60                         "tooltip":true,
  61                         "bottom": true,
  62                         "playing": this.mode == "computer",
  63                         "small": smallScreen,
  64                     },
  65                 },
  66                 [h('i', { 'class': { "material-icons": true } }, "computer")])
  67             );
  68         }
  69         if (["idle","friend"].includes(this.mode))
  70         {
  71             actionArray.push(
  72                 h('button',
  73                 {
  74                     on: { click: this.clickFriendGame },
  75                     attrs: { "aria-label": 'New IRL game' },
  76                     'class': {
  77                         "tooltip":true,
  78                         "bottom": true,
  79                         "playing": this.mode == "friend",
  80                         "small": smallScreen,
  81                     },
  82                 },
  83                 [h('i', { 'class': { "material-icons": true } }, "people")])
  84             );
  85         }
  86         if (!!this.vr)
  87         {
  88             const square00 = document.getElementById("sq-0-0");
  89             const squareWidth = !!square00
  90                 ? parseFloat(window.getComputedStyle(square00).width.slice(0,-2))
  91                 : 0;
  92             const settingsBtnElt = document.getElementById("settingsBtn");
  93             const indicWidth = !!settingsBtnElt //-2 for border:
  94                 ? parseFloat(window.getComputedStyle(settingsBtnElt).height.slice(0,-2)) - 2
  95                 : (smallScreen ? 31 : 37);
  96             if (this.mode == "human")
  97             {
  98                 let connectedIndic = h(
  99                     'div',
 100                     {
 101                         "class": {
 102                             "topindicator": true,
 103                             "indic-left": true,
 104                             "connected": this.oppConnected,
 105                             "disconnected": !this.oppConnected,
 106                         },
 107                         style: {
 108                             "width": indicWidth + "px",
 109                             "height": indicWidth + "px",
 110                         },
 111                     }
 112                 );
 113                 elementArray.push(connectedIndic);
 114             }
 115             let turnIndic = h(
 116                 'div',
 117                 {
 118                     "class": {
 119                         "topindicator": true,
 120                         "indic-right": true,
 121                         "white-turn": this.vr.turn=="w",
 122                         "black-turn": this.vr.turn=="b",
 123                     },
 124                     style: {
 125                         "width": indicWidth + "px",
 126                         "height": indicWidth + "px",
 127                     },
 128                 }
 129             );
 130             elementArray.push(turnIndic);
 131             let settingsBtn = h(
 132                 'button',
 133                 {
 134                     on: { click: this.showSettings },
 135                     attrs: {
 136                         "aria-label": 'Settings',
 137                         "id": "settingsBtn",
 138                     },
 139                     'class': {
 140                         "tooltip": true,
 141                         "topindicator": true,
 142                         "indic-right": true,
 143                         "settings-btn": !smallScreen,
 144                         "settings-btn-small": smallScreen,
 145                     },
 146                 },
 147                 [h('i', { 'class': { "material-icons": true } }, "settings")]
 148             );
 149             elementArray.push(settingsBtn);
 150             let choices = h('div',
 151                 {
 152                     attrs: { "id": "choices" },
 153                     'class': { 'row': true },
 154                     style: {
 155                         "display": this.choices.length>0?"block":"none",
 156                         "top": "-" + ((sizeY/2)*squareWidth+squareWidth/2) + "px",
 157                         "width": (this.choices.length * squareWidth) + "px",
 158                         "height": squareWidth + "px",
 159                     },
 160                 },
 161                 this.choices.map( m => { //a "choice" is a move
 162                     return h('div',
 163                         {
 164                             'class': {
 165                                 'board': true,
 166                                 ['board'+sizeY]: true,
 167                             },
 168                             style: {
 169                                 'width': (100/this.choices.length) + "%",
 170                                 'padding-bottom': (100/this.choices.length) + "%",
 171                             },
 172                         },
 173                         [h('img',
 174                             {
 175                                 attrs: { "src": '/images/pieces/' +
 176                                     VariantRules.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
 177                                 'class': { 'choice-piece': true },
 178                                 on: { "click": e => { this.play(m); this.choices=[]; } },
 179                             })
 180                         ]
 181                     );
 182                 })
 183             );
 184             // Create board element (+ reserves if needed by variant or mode)
 185             const lm = this.vr.lastMove;
 186             const showLight = this.hints &&
 187                 (this.mode!="idle" || this.cursor==this.vr.moves.length);
 188             let gameDiv = h('div',
 189                 {
 190                     'class': { 'game': true },
 191                 },
 192                 [_.range(sizeX).map(i => {
 193                     let ci = this.mycolor=='w' ? i : sizeX-i-1;
 194                     return h(
 195                         'div',
 196                         {
 197                             'class': {
 198                                 'row': true,
 199                             },
 200                             style: { 'opacity': this.choices.length>0?"0.5":"1" },
 201                         },
 202                         _.range(sizeY).map(j => {
 203                             let cj = this.mycolor=='w' ? j : sizeY-j-1;
 204                             let elems = [];
 205                             if (this.vr.board[ci][cj] != VariantRules.EMPTY)
 206                             {
 207                                 elems.push(
 208                                     h(
 209                                         'img',
 210                                         {
 211                                             'class': {
 212                                                 'piece': true,
 213                                                 'ghost': !!this.selectedPiece
 214                                                     && this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
 215                                             },
 216                                             attrs: {
 217                                                 src: "/images/pieces/" +
 218                                                     VariantRules.getPpath(this.vr.board[ci][cj]) + ".svg",
 219                                             },
 220                                         }
 221                                     )
 222                                 );
 223                             }
 224                             if (this.hints && hintSquares[ci][cj])
 225                             {
 226                                 elems.push(
 227                                     h(
 228                                         'img',
 229                                         {
 230                                             'class': {
 231                                                 'mark-square': true,
 232                                             },
 233                                             attrs: {
 234                                                 src: "/images/mark.svg",
 235                                             },
 236                                         }
 237                                     )
 238                                 );
 239                             }
 240                             return h(
 241                                 'div',
 242                                 {
 243                                     'class': {
 244                                         'board': true,
 245                                         ['board'+sizeY]: true,
 246                                         'light-square': (i+j)%2==0,
 247                                         'dark-square': (i+j)%2==1,
 248                                         [this.color]: true,
 249                                         'highlight': showLight && !!lm && _.isMatch(lm.end, {x:ci,y:cj}),
 250                                         'incheck': showLight && incheckSq[ci][cj],
 251                                     },
 252                                     attrs: {
 253                                         id: this.getSquareId({x:ci,y:cj}),
 254                                     },
 255                                 },
 256                                 elems
 257                             );
 258                         })
 259                     );
 260                 }), choices]
 261             );
 262             if (this.mode != "idle")
 263             {
 264                 actionArray.push(
 265                     h('button',
 266                         {
 267                             on: { click: this.resign },
 268                             attrs: { "aria-label": 'Resign' },
 269                             'class': {
 270                                 "tooltip":true,
 271                                 "bottom": true,
 272                                 "small": smallScreen,
 273                             },
 274                         },
 275                         [h('i', { 'class': { "material-icons": true } }, "flag")])
 276                 );
 277             }
 278             else if (this.vr.moves.length > 0)
 279             {
 280                 // A game finished, and another is not started yet: allow navigation
 281                 actionArray = actionArray.concat([
 282                     h('button',
 283                         {
 284                             on: { click: e => this.undo() },
 285                             attrs: { "aria-label": 'Undo' },
 286                             "class": {
 287                                 "small": smallScreen,
 288                                 "marginleft": true,
 289                             },
 290                         },
 291                         [h('i', { 'class': { "material-icons": true } }, "fast_rewind")]),
 292                     h('button',
 293                         {
 294                             on: { click: e => this.play() },
 295                             attrs: { "aria-label": 'Play' },
 296                             "class": { "small": smallScreen },
 297                         },
 298                         [h('i', { 'class': { "material-icons": true } }, "fast_forward")]),
 299                     ]
 300                 );
 301             }
 302             if (this.mode == "friend")
 303             {
 304                 actionArray = actionArray.concat(
 305                 [
 306                     h('button',
 307                         {
 308                             on: { click: this.undoInGame },
 309                             attrs: { "aria-label": 'Undo' },
 310                             "class": {
 311                                 "small": smallScreen,
 312                                 "marginleft": true,
 313                             },
 314                         },
 315                         [h('i', { 'class': { "material-icons": true } }, "undo")]
 316                     ),
 317                     h('button',
 318                         {
 319                             on: { click: () => { this.mycolor = this.vr.getOppCol(this.mycolor) } },
 320                             attrs: { "aria-label": 'Flip' },
 321                             "class": { "small": smallScreen },
 322                         },
 323                         [h('i', { 'class': { "material-icons": true } }, "cached")]
 324                     ),
 325                 ]);
 326             }
 327             elementArray.push(gameDiv);
 328             if (!!this.vr.reserve)
 329             {
 330                 const shiftIdx = (this.mycolor=="w" ? 0 : 1);
 331                 let myReservePiecesArray = [];
 332                 for (let i=0; i<VariantRules.RESERVE_PIECES.length; i++)
 333                 {
 334                     myReservePiecesArray.push(h('div',
 335                     {
 336                         'class': {'board':true, ['board'+sizeY]:true},
 337                         attrs: { id: this.getSquareId({x:sizeX+shiftIdx,y:i}) }
 338                     },
 339                     [
 340                         h('img',
 341                         {
 342                             'class': {"piece":true},
 343                             attrs: {
 344                                 "src": "/images/pieces/" +
 345                                     this.vr.getReservePpath(this.mycolor,i) + ".svg",
 346                             }
 347                         }),
 348                         h('sup',
 349                             {"class": { "reserve-count": true } },
 350                             [ this.vr.reserve[this.mycolor][VariantRules.RESERVE_PIECES[i]] ]
 351                         )
 352                     ]));
 353                 }
 354                 let oppReservePiecesArray = [];
 355                 const oppCol = this.vr.getOppCol(this.mycolor);
 356                 for (let i=0; i<VariantRules.RESERVE_PIECES.length; i++)
 357                 {
 358                     oppReservePiecesArray.push(h('div',
 359                     {
 360                         'class': {'board':true, ['board'+sizeY]:true},
 361                         attrs: { id: this.getSquareId({x:sizeX+(1-shiftIdx),y:i}) }
 362                     },
 363                     [
 364                         h('img',
 365                         {
 366                             'class': {"piece":true},
 367                             attrs: {
 368                                 "src": "/images/pieces/" +
 369                                     this.vr.getReservePpath(oppCol,i) + ".svg",
 370                             }
 371                         }),
 372                         h('sup',
 373                             {"class": { "reserve-count": true } },
 374                             [ this.vr.reserve[oppCol][VariantRules.RESERVE_PIECES[i]] ]
 375                         )
 376                     ]));
 377                 }
 378                 let reserves = h('div',
 379                     {
 380                         'class':{
 381                             'game': true,
 382                             "reserve-div": true,
 383                         },
 384                     },
 385                     [
 386                         h('div',
 387                             {
 388                                 'class': {
 389                                     'row': true,
 390                                     "reserve-row-1": true,
 391                                 },
 392                             },
 393                             myReservePiecesArray
 394                         ),
 395                         h('div',
 396                             { 'class': { 'row': true }},
 397                             oppReservePiecesArray
 398                         )
 399                     ]
 400                 );
 401                 elementArray.push(reserves);
 402             }
 403             const eogMessage = this.getEndgameMessage(this.score);
 404             const modalEog = [
 405                 h('input',
 406                     {
 407                         attrs: { "id": "modal-eog", type: "checkbox" },
 408                         "class": { "modal": true },
 409                     }),
 410                 h('div',
 411                     {
 412                         attrs: { "role": "dialog", "aria-labelledby": "modal-eog" },
 413                     },
 414                     [
 415                         h('div',
 416                             {
 417                                 "class": { "card": true, "smallpad": true },
 418                             },
 419                             [
 420                                 h('label',
 421                                     {
 422                                         attrs: { "for": "modal-eog" },
 423                                         "class": { "modal-close": true },
 424                                     }
 425                                 ),
 426                                 h('h3',
 427                                     {
 428                                         "class": { "section": true },
 429                                         domProps: { innerHTML: eogMessage },
 430                                     }
 431                                 )
 432                             ]
 433                         )
 434                     ]
 435                 )
 436             ];
 437             elementArray = elementArray.concat(modalEog);
 438         }
 439         // NOTE: this modal could be in Pug view (no usage of Vue functions or variables)
 440         const modalNewgame = [
 441             h('input',
 442                 {
 443                     attrs: { "id": "modal-newgame", type: "checkbox" },
 444                     "class": { "modal": true },
 445                 }),
 446             h('div',
 447                 {
 448                     attrs: { "role": "dialog", "aria-labelledby": "modal-newgame" },
 449                 },
 450                 [
 451                     h('div',
 452                         {
 453                             "class": { "card": true, "smallpad": true },
 454                         },
 455                         [
 456                             h('label',
 457                                 {
 458                                     attrs: { "id": "close-newgame", "for": "modal-newgame" },
 459                                     "class": { "modal-close": true },
 460                                 }
 461                             ),
 462                             h('h3',
 463                                 {
 464                                     "class": { "section": true },
 465                                     domProps: { innerHTML: "New game" },
 466                                 }
 467                             ),
 468                             h('p',
 469                                 {
 470                                     "class": { "section": true },
 471                                     domProps: { innerHTML: "Waiting for opponent..." },
 472                                 }
 473                             )
 474                         ]
 475                     )
 476                 ]
 477             )
 478         ];
 479         elementArray = elementArray.concat(modalNewgame);
 480         const modalFenEdit = [
 481             h('input',
 482                 {
 483                     attrs: { "id": "modal-fenedit", type: "checkbox" },
 484                     "class": { "modal": true },
 485                 }),
 486             h('div',
 487                 {
 488                     attrs: { "role": "dialog", "aria-labelledby": "modal-fenedit" },
 489                 },
 490                 [
 491                     h('div',
 492                         {
 493                             "class": { "card": true, "smallpad": true },
 494                         },
 495                         [
 496                             h('label',
 497                                 {
 498                                     attrs: { "id": "close-fenedit", "for": "modal-fenedit" },
 499                                     "class": { "modal-close": true },
 500                                 }
 501                             ),
 502                             h('h3',
 503                                 {
 504                                     "class": { "section": true },
 505                                     domProps: { innerHTML: "Position + flags (FEN):" },
 506                                 }
 507                             ),
 508                             h('input',
 509                                 {
 510                                     attrs: {
 511                                         "id": "input-fen",
 512                                         type: "text",
 513                                         value: VariantRules.GenRandInitFen(),
 514                                     },
 515                                 }
 516                             ),
 517                             h('button',
 518                                 {
 519                                     on: { click:
 520                                         () => {
 521                                             const fen = document.getElementById("input-fen").value;
 522                                             document.getElementById("modal-fenedit").checked = false;
 523                                             this.newGame("friend", fen);
 524                                         }
 525                                     },
 526                                     domProps: { innerHTML: "Ok" },
 527                                 }
 528                             ),
 529                             h('button',
 530                                 {
 531                                     on: { click:
 532                                         () => {
 533                                             document.getElementById("input-fen").value =
 534                                                 VariantRules.GenRandInitFen();
 535                                         }
 536                                     },
 537                                     domProps: { innerHTML: "Random" },
 538                                 }
 539                             ),
 540                         ]
 541                     )
 542                 ]
 543             )
 544         ];
 545         elementArray = elementArray.concat(modalFenEdit);
 546         const modalSettings = [
 547             h('input',
 548                 {
 549                     attrs: { "id": "modal-settings", type: "checkbox" },
 550                     "class": { "modal": true },
 551                 }),
 552             h('div',
 553                 {
 554                     attrs: { "role": "dialog", "aria-labelledby": "modal-settings" },
 555                 },
 556                 [
 557                     h('div',
 558                         {
 559                             "class": { "card": true, "smallpad": true },
 560                         },
 561                         [
 562                             h('label',
 563                                 {
 564                                     attrs: { "id": "close-settings", "for": "modal-settings" },
 565                                     "class": { "modal-close": true },
 566                                 }
 567                             ),
 568                             h('h3',
 569                                 {
 570                                     "class": { "section": true },
 571                                     domProps: { innerHTML: "Preferences" },
 572                                 }
 573                             ),
 574                             h('fieldset',
 575                               { },
 576                                 [
 577                                     //h('legend', { domProps: { innerHTML: "Legend title" } }),
 578                                     h('label',
 579                                         {
 580                                             attrs: { for: "setHints" },
 581                                             domProps: { innerHTML: "Show hints?" },
 582                                         },
 583                                     ),
 584                                     h('input',
 585                                         {
 586                                             attrs: {
 587                                                 "id": "setHints",
 588                                                 type: "checkbox",
 589                                                 checked: this.hints,
 590                                             },
 591                                             on: { "change": this.toggleHints },
 592                                         }
 593                                     ),
 594                                 ]
 595                             ),
 596                             h('fieldset',
 597                                 { },
 598                                 [
 599                                     h('label',
 600                                         {
 601                                             attrs: { for: "selectColor" },
 602                                             domProps: { innerHTML: "Board colors" },
 603                                         },
 604                                     ),
 605                                     h("select",
 606                                         {
 607                                             attrs: { "id": "selectColor" },
 608                                             on: { "change": this.setColor },
 609                                         },
 610                                         [
 611                                             h("option",
 612                                                 {
 613                                                     domProps: {
 614                                                         "value": "lichess",
 615                                                         innerHTML: "brown"
 616                                                     },
 617                                                     attrs: { "selected": this.color=="lichess" },
 618                                                 }
 619                                             ),
 620                                             h("option",
 621                                                 {
 622                                                     domProps: {
 623                                                         "value": "chesscom",
 624                                                         innerHTML: "green"
 625                                                     },
 626                                                     attrs: { "selected": this.color=="chesscom" },
 627                                                 }
 628                                             ),
 629                                             h("option",
 630                                                 {
 631                                                     domProps: {
 632                                                         "value": "chesstempo",
 633                                                         innerHTML: "blue"
 634                                                     },
 635                                                     attrs: { "selected": this.color=="chesstempo" },
 636                                                 }
 637                                             ),
 638                                         ],
 639                                     ),
 640                                 ]
 641                             ),
 642                             h('fieldset',
 643                                 { },
 644                                 [
 645                                     h('label',
 646                                         {
 647                                             attrs: { for: "selectSound" },
 648                                             domProps: { innerHTML: "Play sounds?" },
 649                                         },
 650                                     ),
 651                                     h("select",
 652                                         {
 653                                             attrs: { "id": "selectSound" },
 654                                             on: { "change": this.setSound },
 655                                         },
 656                                         [
 657                                             h("option",
 658                                                 {
 659                                                     domProps: {
 660                                                         "value": "0",
 661                                                         innerHTML: "None"
 662                                                     },
 663                                                     attrs: { "selected": this.sound==0 },
 664                                                 }
 665                                             ),
 666                                             h("option",
 667                                                 {
 668                                                     domProps: {
 669                                                         "value": "1",
 670                                                         innerHTML: "Newgame"
 671                                                     },
 672                                                     attrs: { "selected": this.sound==1 },
 673                                                 }
 674                                             ),
 675                                             h("option",
 676                                                 {
 677                                                     domProps: {
 678                                                         "value": "2",
 679                                                         innerHTML: "All"
 680                                                     },
 681                                                     attrs: { "selected": this.sound==2 },
 682                                                 }
 683                                             ),
 684                                         ],
 685                                     ),
 686                                 ]
 687                             ),
 688                         ]
 689                     )
 690                 ]
 691             )
 692         ];
 693         elementArray = elementArray.concat(modalSettings);
 694         const actions = h('div',
 695             {
 696                 attrs: { "id": "actions" },
 697                 'class': { 'text-center': true },
 698             },
 699             actionArray
 700         );
 701         elementArray.push(actions);
 702         if (this.score != "*")
 703         {
 704             elementArray.push(
 705                 h('div',
 706                     {
 707                         attrs: { id: "pgn-div" },
 708                         "class": { "section-content": true },
 709                     },
 710                     [
 711                         h('a',
 712                             {
 713                                 attrs: {
 714                                     id: "download",
 715                                     href: "#",
 716                                 }
 717                             }
 718                         ),
 719                         h('p',
 720                             {
 721                                 attrs: { id: "pgn-game" },
 722                                 domProps: { innerHTML: this.pgnTxt }
 723                             }
 724                         ),
 725                         h('button',
 726                             {
 727                                 attrs: { "id": "downloadBtn" },
 728                                 on: { click: this.download },
 729                                 domProps: { innerHTML: "Download game" },
 730                             }
 731                         ),
 732                     ]
 733                 )
 734             );
 735         }
 736         else if (this.mode != "idle")
 737         {
 738             // Show current FEN
 739             elementArray.push(
 740                 h('div',
 741                     {
 742                         attrs: { id: "fen-div" },
 743                         "class": { "section-content": true },
 744                     },
 745                     [
 746                         h('p',
 747                             {
 748                                 attrs: { id: "fen-string" },
 749                                 domProps: { innerHTML: this.vr.getFen() }
 750                             }
 751                         )
 752                     ]
 753                 )
 754             );
 755         }
 756         return h(
 757             'div',
 758             {
 759                 'class': {
 760                     "col-sm-12":true,
 761                     "col-md-8":true,
 762                     "col-md-offset-2":true,
 763                     "col-lg-6":true,
 764                     "col-lg-offset-3":true,
 765                 },
 766                 // NOTE: click = mousedown + mouseup
 767                 on: {
 768                     mousedown: this.mousedown,
 769                     mousemove: this.mousemove,
 770                     mouseup: this.mouseup,
 771                     touchstart: this.mousedown,
 772                     touchmove: this.mousemove,
 773                     touchend: this.mouseup,
 774                 },
 775             },
 776             elementArray
 777         );
 778     },
 779     created: function() {
 780         const url = socketUrl;
 781         const continuation = (localStorage.getItem("variant") === variant);
 782         this.myid = (continuation ? localStorage.getItem("myid") : getRandString());
 783         if (!continuation)
 784         {
 785             // HACK: play a small silent sound to allow "new game" sound later
 786             // if tab not focused (TODO: does it really work ?!)
 787             new Audio("/sounds/silent.mp3").play().then(() => {}).catch(err => {});
 788         }
 789         this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 790         const socketOpenListener = () => {
 791             if (continuation)
 792             {
 793                 const fen = localStorage.getItem("fen");
 794                 const mycolor = localStorage.getItem("mycolor");
 795                 const oppid = localStorage.getItem("oppid");
 796                 const moves = JSON.parse(localStorage.getItem("moves"));
 797                 this.newGame("human", fen, mycolor, oppid, moves, true);
 798                 // Send ping to server (answer pong if opponent is connected)
 799                 this.conn.send(JSON.stringify({code:"ping",oppid:this.oppid}));
 800             }
 801             else if (localStorage.getItem("newgame") === variant)
 802             {
 803                 // New game request has been cancelled on disconnect
 804                 this.newGame("human", undefined, undefined, undefined, undefined, "reconnect");
 805             }
 806         };
 807         const socketMessageListener = msg => {
 808             const data = JSON.parse(msg.data);
 809             switch (data.code)
 810             {
 811                 case "duplicate":
 812                     // We opened another tab on the same game
 813                     this.mode = "idle";
 814                     this.vr = null;
 815                     alert("Already playing a game in this variant on another tab!");
 816                     break;
 817                 case "newgame": //opponent found
 818                     // oppid: opponent socket ID
 819                     this.newGame("human", data.fen, data.color, data.oppid);
 820                     break;
 821                 case "newmove": //..he played!
 822                     this.play(data.move, "animate");
 823                     break;
 824                 case "pong": //received if we sent a ping (game still alive on our side)
 825                     this.oppConnected = true;
 826                     const L = this.vr.moves.length;
 827                     // Send our "last state" informations to opponent
 828                     this.conn.send(JSON.stringify({
 829                         code:"lastate",
 830                         oppid:this.oppid,
 831                         lastMove:L>0?this.vr.moves[L-1]:undefined,
 832                         movesCount:L,
 833                     }));
 834                     break;
 835                 case "lastate": //got opponent infos about last move (we might have resigned)
 836                     if (this.mode!="human" || this.oppid!=data.oppid)
 837                     {
 838                         // OK, we resigned
 839                         this.conn.send(JSON.stringify({
 840                             code:"lastate",
 841                             oppid:this.oppid,
 842                             lastMove:undefined,
 843                             movesCount:-1,
 844                         }));
 845                     }
 846                     else if (data.movesCount < 0)
 847                     {
 848                         // OK, he resigned
 849                         this.endGame(this.mycolor=="w"?"1-0":"0-1");
 850                     }
 851                     else if (data.movesCount < this.vr.moves.length)
 852                     {
 853                         // We must tell last move to opponent
 854                         const L = this.vr.moves.length;
 855                         this.conn.send(JSON.stringify({
 856                             code:"lastate",
 857                             oppid:this.oppid,
 858                             lastMove:this.vr.moves[L-1],
 859                             movesCount:L,
 860                         }));
 861                     }
 862                     else if (data.movesCount > this.vr.moves.length) //just got last move from him
 863                         this.play(data.lastMove, "animate");
 864                     break;
 865                 case "resign": //..you won!
 866                     this.endGame(this.mycolor=="w"?"1-0":"0-1");
 867                     break;
 868                 // TODO: also use (dis)connect info to count online players?
 869                 case "connect":
 870                 case "disconnect":
 871                     if (this.mode == "human" && this.oppid == data.id)
 872                         this.oppConnected = (data.code == "connect");
 873                     break;
 874             }
 875         };
 876         const socketCloseListener = () => {
 877             this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 878             this.conn.addEventListener('open', socketOpenListener);
 879             this.conn.addEventListener('message', socketMessageListener);
 880             this.conn.addEventListener('close', socketCloseListener);
 881         };
 882         this.conn.onopen = socketOpenListener;
 883         this.conn.onmessage = socketMessageListener;
 884         this.conn.onclose = socketCloseListener;
 885         // Listen to keyboard left/right to navigate in game
 886         document.onkeydown = event => {
 887             if (this.mode == "idle" && !!this.vr && this.vr.moves.length > 0
 888                 && [37,39].includes(event.keyCode))
 889             {
 890                 event.preventDefault();
 891                 if (event.keyCode == 37) //Back
 892                     this.undo();
 893                 else //Forward (39)
 894                     this.play();
 895             }
 896         };
 897     },
 898     methods: {
 899         download: function() {
 900             let content = document.getElementById("pgn-game").innerHTML;
 901             content = content.replace(/<br>/g, "\n");
 902             // Prepare and trigger download link
 903             let downloadAnchor = document.getElementById("download");
 904             downloadAnchor.setAttribute("download", "game.pgn");
 905             downloadAnchor.href = "data:text/plain;charset=utf-8," +
 906                 encodeURIComponent(content);
 907             downloadAnchor.click();
 908         },
 909         endGame: function(score) {
 910             this.score = score;
 911             let modalBox = document.getElementById("modal-eog");
 912             modalBox.checked = true;
 913             // Variants may have special PGN structure (so next function isn't defined here)
 914             this.pgnTxt = this.vr.getPGN(this.mycolor, this.score, this.fenStart, this.mode);
 915             setTimeout(() => { modalBox.checked = false; }, 2000);
 916             if (this.mode == "human")
 917                 this.clearStorage();
 918             this.mode = "idle";
 919             this.cursor = this.vr.moves.length; //to navigate in finished game
 920             this.oppid = "";
 921         },
 922         getEndgameMessage: function(score) {
 923             let eogMessage = "Unfinished";
 924             switch (this.score)
 925             {
 926                 case "1-0":
 927                     eogMessage = "White win";
 928                     break;
 929                 case "0-1":
 930                     eogMessage = "Black win";
 931                     break;
 932                 case "1/2":
 933                     eogMessage = "Draw";
 934                     break;
 935             }
 936             return eogMessage;
 937         },
 938         setStorage: function() {
 939             localStorage.setItem("myid", this.myid);
 940             localStorage.setItem("variant", variant);
 941             localStorage.setItem("mycolor", this.mycolor);
 942             localStorage.setItem("oppid", this.oppid);
 943             localStorage.setItem("fenStart", this.fenStart);
 944             localStorage.setItem("moves", JSON.stringify(this.vr.moves));
 945             localStorage.setItem("fen", this.vr.getFen());
 946         },
 947         updateStorage: function() {
 948             localStorage.setItem("moves", JSON.stringify(this.vr.moves));
 949             localStorage.setItem("fen", this.vr.getFen());
 950         },
 951         clearStorage: function() {
 952             delete localStorage["variant"];
 953             delete localStorage["myid"];
 954             delete localStorage["mycolor"];
 955             delete localStorage["oppid"];
 956             delete localStorage["fenStart"];
 957             delete localStorage["fen"];
 958             delete localStorage["moves"];
 959         },
 960         // HACK because mini-css tooltips are persistent after click...
 961         getRidOfTooltip: function(elt) {
 962             elt.style.visibility = "hidden";
 963             setTimeout(() => { elt.style.visibility="visible"; }, 100);
 964         },
 965         showSettings: function(e) {
 966             this.getRidOfTooltip(e.currentTarget);
 967             document.getElementById("modal-settings").checked = true;
 968         },
 969         toggleHints: function() {
 970             this.hints = !this.hints;
 971             setCookie("hints", this.hints ? "1" : "0");
 972         },
 973         setColor: function(e) {
 974             this.color = e.target.options[e.target.selectedIndex].value;
 975             setCookie("color", this.color);
 976         },
 977         setSound: function(e) {
 978             this.sound = parseInt(e.target.options[e.target.selectedIndex].value);
 979             setCookie("sound", this.sound);
 980         },
 981         clickGameSeek: function(e) {
 982             this.getRidOfTooltip(e.currentTarget);
 983             if (this.mode == "human")
 984                 return; //no newgame while playing
 985             if (this.seek)
 986             {
 987                 this.conn.send(JSON.stringify({code:"cancelnewgame"}));
 988                 delete localStorage["newgame"]; //cancel game seek
 989                 this.seek = false;
 990             }
 991             else
 992                 this.newGame("human");
 993         },
 994         clickComputerGame: function(e) {
 995             this.getRidOfTooltip(e.currentTarget);
 996             if (this.mode == "human")
 997                 return; //no newgame while playing
 998             this.newGame("computer");
 999         },
1000         clickFriendGame: function(e) {
1001             this.getRidOfTooltip(e.currentTarget);
1002             document.getElementById("modal-fenedit").checked = true;
1003         },
1004         resign: function(e) {
1005             this.getRidOfTooltip(e.currentTarget);
1006             if (this.mode == "human" && this.oppConnected)
1007             {
1008                 try {
1009                     this.conn.send(JSON.stringify({code: "resign", oppid: this.oppid}));
1010                 } catch (INVALID_STATE_ERR) {
1011                     return; //socket is not ready (and not yet reconnected)
1012                 }
1013             }
1014             this.endGame(this.mycolor=="w"?"0-1":"1-0");
1015         },
1016         newGame: function(mode, fenInit, color, oppId, moves, continuation) {
1017             const fen = fenInit || VariantRules.GenRandInitFen();
1018             console.log(fen); //DEBUG
1019             if (mode=="human" && !oppId)
1020             {
1021                 const storageVariant = localStorage.getItem("variant");
1022                 if (!!storageVariant && storageVariant !== variant)
1023                 {
1024                     alert("Finish your " + storageVariant + " game first!");
1025                     return;
1026                 }
1027                 // Send game request and wait..
1028                 localStorage["newgame"] = variant;
1029                 this.seek = true;
1030                 this.clearStorage(); //in case of
1031                 try {
1032                     this.conn.send(JSON.stringify({code:"newgame", fen:fen}));
1033                 } catch (INVALID_STATE_ERR) {
1034                     return; //nothing achieved
1035                 }
1036                 if (continuation !== "reconnect") //TODO: bad HACK...
1037                 {
1038                     let modalBox = document.getElementById("modal-newgame");
1039                     modalBox.checked = true;
1040                     setTimeout(() => { modalBox.checked = false; }, 2000);
1041                 }
1042                 return;
1043             }
1044             this.vr = new VariantRules(fen, moves || []);
1045             this.score = "*";
1046             this.pgnTxt = ""; //redundant with this.score = "*", but cleaner
1047             this.mode = mode;
1048             this.incheck = []; //in case of
1049             this.fenStart = (continuation ? localStorage.getItem("fenStart") : fen);
1050             if (mode=="human")
1051             {
1052                 // Opponent found!
1053                 if (!continuation) //not playing sound on game continuation
1054                 {
1055                     if (this.sound >= 1)
1056                         new Audio("/sounds/newgame.mp3").play().then(() => {}).catch(err => {});
1057                     document.getElementById("modal-newgame").checked = false;
1058                 }
1059                 this.oppid = oppId;
1060                 this.oppConnected = !continuation;
1061                 this.mycolor = color;
1062                 this.seek = false;
1063                 if (!!moves && moves.length > 0) //imply continuation
1064                 {
1065                     const lastMove = moves[moves.length-1];
1066                     this.vr.undo(lastMove);
1067                     this.incheck = this.vr.getCheckSquares(lastMove);
1068                     this.vr.play(lastMove, "ingame");
1069                 }
1070                 delete localStorage["newgame"];
1071                 this.setStorage(); //in case of interruptions
1072             }
1073             else if (mode == "computer")
1074             {
1075                 this.mycolor = Math.random() < 0.5 ? 'w' : 'b';
1076                 if (this.mycolor == 'b')
1077                     setTimeout(this.playComputerMove, 500);
1078             }
1079             //else: against a (IRL) friend: nothing more to do
1080         },
1081         playComputerMove: function() {
1082             const timeStart = Date.now();
1083             const compMove = this.vr.getComputerMove();
1084             // (first move) HACK: avoid selecting elements before they appear on page:
1085             const delay = Math.max(500-(Date.now()-timeStart), 0);
1086             setTimeout(() => this.play(compMove, "animate"), delay);
1087         },
1088         // Get the identifier of a HTML table cell from its numeric coordinates o.x,o.y.
1089         getSquareId: function(o) {
1090             // NOTE: a separator is required to allow any size of board
1091             return  "sq-" + o.x + "-" + o.y;
1092         },
1093         // Inverse function
1094         getSquareFromId: function(id) {
1095             let idParts = id.split('-');
1096             return [parseInt(idParts[1]), parseInt(idParts[2])];
1097         },
1098         mousedown: function(e) {
1099             e = e || window.event;
1100             let ingame = false;
1101             let elem = e.target;
1102             while (!ingame && elem !== null)
1103             {
1104                 if (elem.classList.contains("game"))
1105                 {
1106                     ingame = true;
1107                     break;
1108                 }
1109                 elem = elem.parentElement;
1110             }
1111             if (!ingame) //let default behavior (click on button...)
1112                 return;
1113             e.preventDefault(); //disable native drag & drop
1114             if (!this.selectedPiece && e.target.classList.contains("piece"))
1115             {
1116                 // Next few lines to center the piece on mouse cursor
1117                 let rect = e.target.parentNode.getBoundingClientRect();
1118                 this.start = {
1119                     x: rect.x + rect.width/2,
1120                     y: rect.y + rect.width/2,
1121                     id: e.target.parentNode.id
1122                 };
1123                 this.selectedPiece = e.target.cloneNode();
1124                 this.selectedPiece.style.position = "absolute";
1125                 this.selectedPiece.style.top = 0;
1126                 this.selectedPiece.style.display = "inline-block";
1127                 this.selectedPiece.style.zIndex = 3000;
1128                 let startSquare = this.getSquareFromId(e.target.parentNode.id);
1129                 const iCanPlay = this.mode!="idle"
1130                     && (this.mode=="friend" || this.vr.canIplay(this.mycolor,startSquare));
1131                 this.possibleMoves = iCanPlay ? this.vr.getPossibleMovesFrom(startSquare) : [];
1132                 // Next line add moving piece just after current image
1133                 // (required for Crazyhouse reserve)
1134                 e.target.parentNode.insertBefore(this.selectedPiece, e.target.nextSibling);
1135             }
1136         },
1137         mousemove: function(e) {
1138             if (!this.selectedPiece)
1139                 return;
1140             e = e || window.event;
1141             // If there is an active element, move it around
1142             if (!!this.selectedPiece)
1143             {
1144                 const [offsetX,offsetY] = !!e.clientX
1145                     ? [e.clientX,e.clientY] //desktop browser
1146                     : [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
1147                 this.selectedPiece.style.left = (offsetX-this.start.x) + "px";
1148                 this.selectedPiece.style.top = (offsetY-this.start.y) + "px";
1149             }
1150         },
1151         mouseup: function(e) {
1152             if (!this.selectedPiece)
1153                 return;
1154             e = e || window.event;
1155             // Read drop target (or parentElement, parentNode... if type == "img")
1156             this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coords
1157             const [offsetX,offsetY] = !!e.clientX
1158                 ? [e.clientX,e.clientY]
1159                 : [e.changedTouches[0].pageX, e.changedTouches[0].pageY];
1160             let landing = document.elementFromPoint(offsetX, offsetY);
1161             this.selectedPiece.style.zIndex = 3000;
1162             // Next condition: classList.contains(piece) fails because of marks
1163             while (landing.tagName == "IMG")
1164                 landing = landing.parentNode;
1165             if (this.start.id == landing.id)
1166             {
1167                 // A click: selectedPiece and possibleMoves are already filled
1168                 return;
1169             }
1170             // OK: process move attempt
1171             let endSquare = this.getSquareFromId(landing.id);
1172             let moves = this.findMatchingMoves(endSquare);
1173             this.possibleMoves = [];
1174             if (moves.length > 1)
1175                 this.choices = moves;
1176             else if (moves.length==1)
1177                 this.play(moves[0]);
1178             // Else: impossible move
1179             this.selectedPiece.parentNode.removeChild(this.selectedPiece);
1180             delete this.selectedPiece;
1181             this.selectedPiece = null;
1182         },
1183         findMatchingMoves: function(endSquare) {
1184             // Run through moves list and return the matching set (if promotions...)
1185             let moves = [];
1186             this.possibleMoves.forEach(function(m) {
1187                 if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
1188                     moves.push(m);
1189             });
1190             return moves;
1191         },
1192         animateMove: function(move) {
1193             let startSquare = document.getElementById(this.getSquareId(move.start));
1194             let endSquare = document.getElementById(this.getSquareId(move.end));
1195             let rectStart = startSquare.getBoundingClientRect();
1196             let rectEnd = endSquare.getBoundingClientRect();
1197             let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
1198             let movingPiece =
1199                 document.querySelector("#" + this.getSquareId(move.start) + " > img.piece");
1200             // HACK for animation (with positive translate, image slides "under background")
1201             // Possible improvement: just alter squares on the piece's way...
1202             squares = document.getElementsByClassName("board");
1203             for (let i=0; i<squares.length; i++)
1204             {
1205                 let square = squares.item(i);
1206                 if (square.id != this.getSquareId(move.start))
1207                     square.style.zIndex = "-1";
1208             }
1209             movingPiece.style.transform = "translate(" + translation.x + "px," +
1210                 translation.y + "px)";
1211             movingPiece.style.transitionDuration = "0.2s";
1212             movingPiece.style.zIndex = "3000";
1213             setTimeout( () => {
1214                 for (let i=0; i<squares.length; i++)
1215                     squares.item(i).style.zIndex = "auto";
1216                 movingPiece.style = {}; //required e.g. for 0-0 with KR swap
1217                 this.play(move);
1218             }, 200);
1219         },
1220         play: function(move, programmatic) {
1221             if (!move)
1222             {
1223                 // Navigate after game is over
1224                 if (this.cursor >= this.vr.moves.length)
1225                     return; //already at the end
1226                 move = this.vr.moves[this.cursor++];
1227             }
1228             if (!!programmatic) //computer or human opponent
1229             {
1230                 this.animateMove(move);
1231                 return;
1232             }
1233             // Not programmatic, or animation is over
1234             if (this.mode == "human" && this.vr.turn == this.mycolor)
1235                 this.conn.send(JSON.stringify({code:"newmove", move:move, oppid:this.oppid}));
1236             if (this.sound == 2)
1237                 new Audio("/sounds/chessmove1.mp3").play().then(() => {}).catch(err => {});
1238             if (this.mode != "idle")
1239             {
1240                 this.incheck = this.vr.getCheckSquares(move); //is opponent in check?
1241                 this.vr.play(move, "ingame");
1242             }
1243             else
1244             {
1245                 VariantRules.PlayOnBoard(this.vr.board, move);
1246                 this.$forceUpdate(); //TODO: ?!
1247             }
1248             if (this.mode == "human")
1249                 this.updateStorage(); //after our moves and opponent moves
1250             if (this.mode != "idle")
1251             {
1252                 const eog = this.vr.checkGameOver();
1253                 if (eog != "*")
1254                     this.endGame(eog);
1255             }
1256             if (this.mode == "computer" && this.vr.turn != this.mycolor)
1257                 setTimeout(this.playComputerMove, 500);
1258         },
1259         undo: function() {
1260             // Navigate after game is over
1261             if (this.cursor == 0)
1262                 return; //already at the beginning
1263             if (this.cursor == this.vr.moves.length)
1264                 this.incheck = []; //in case of...
1265             const move = this.vr.moves[--this.cursor];
1266             VariantRules.UndoOnBoard(this.vr.board, move);
1267             this.$forceUpdate(); //TODO: ?!
1268         },
1269         undoInGame: function() {
1270             const lm = this.vr.lastMove;
1271             if (!!lm)
1272                 this.vr.undo(lm);
1273         },
1274     },
1275 })