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