public/javascripts/components/game.js

   1 // TODO: use indexedDB instead of localStorage? (more flexible...)
   2
   3 Vue.component('my-game', {
   4     data: function() {
   5         return {
   6             vr: null, //object to check moves, store them, FEN..
   7             mycolor: "w",
   8             possibleMoves: [], //filled after each valid click/dragstart
   9             choices: [], //promotion pieces, or checkered captures... (contain possible pieces)
  10             start: {}, //pixels coordinates + id of starting square (click or drag)
  11             selectedPiece: null, //moving piece (or clicked piece)
  12             conn: null, //socket messages
  13             score: "*", //'*' means 'unfinished'
  14             mode: "idle", //human, computer or idle (when not playing)
  15             oppid: "", //opponent ID in case of HH game
  16             oppConnected: false,
  17             seek: false,
  18             fenStart: "",
  19             incheck: false,
  20         };
  21     },
  22     render(h) {
  23         let [sizeX,sizeY] = VariantRules.size;
  24         // Precompute hints squares to facilitate rendering
  25         let hintSquares = doubleArray(sizeX, sizeY, false);
  26         this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
  27         let elementArray = [];
  28         let square00 = document.getElementById("sq-0-0");
  29         let squareWidth = !!square00
  30             ? parseFloat(window.getComputedStyle(square00).width.slice(0,-2))
  31             : 0;
  32         const playingHuman = (this.mode == "human");
  33         const playingComp = (this.mode == "computer");
  34         let actionArray = [
  35             h('button',
  36                 {
  37                     on: {
  38                         click: () => {
  39                             if (this.mode == "human")
  40                                 return; //no newgame while playing
  41                             if (this.seek)
  42                                 delete localStorage["newgame"]; //cancel game seek
  43                             else
  44                             {
  45                                 localStorage["newgame"] = variant;
  46                                 this.newGame("human");
  47                             }
  48                             this.seek = !this.seek;
  49                         }
  50                     },
  51                     attrs: { "aria-label": 'New game VS human' },
  52                     'class': {
  53                         "tooltip": true,
  54                         "seek": this.seek,
  55                         "playing": playingHuman,
  56                     },
  57                 },
  58                 [h('i', { 'class': { "material-icons": true } }, "accessibility")]),
  59             h('button',
  60                 {
  61                     on: {
  62                         click: () => {
  63                             if (this.mode == "human")
  64                                 return; //no newgame while playing
  65                             this.newGame("computer");
  66                         }
  67                     },
  68                     attrs: { "aria-label": 'New game VS computer' },
  69                     'class': {
  70                         "tooltip":true,
  71                         "playing": playingComp,
  72                     },
  73                 },
  74                 [h('i', { 'class': { "material-icons": true } }, "computer")])
  75         ];
  76         if (!!this.vr)
  77         {
  78             if (this.mode == "human")
  79             {
  80                 let connectedIndic = h(
  81                     'div',
  82                     {
  83                         "class": {
  84                             "connected": this.oppConnected,
  85                             "disconnected": !this.oppConnected,
  86                         },
  87                     }
  88                 );
  89                 elementArray.push(connectedIndic);
  90             }
  91             let choices = h('div',
  92                 {
  93                     attrs: { "id": "choices" },
  94                     'class': { 'row': true },
  95                     style: {
  96                         //"position": "relative",
  97                         "display": this.choices.length>0?"block":"none",
  98                         "top": "-" + ((sizeY/2)*squareWidth+squareWidth/2) + "px",
  99                         "width": (this.choices.length * squareWidth) + "px",
 100                         "height": squareWidth + "px",
 101                     },
 102                 },
 103                 this.choices.map( m => { //a "choice" is a move
 104                     return h('div',
 105                         {
 106                             'class': { 'board': true },
 107                             style: {
 108                                 'width': (100/this.choices.length) + "%",
 109                                 'padding-bottom': (100/this.choices.length) + "%",
 110                             },
 111                         },
 112                         [h('img',
 113                             {
 114                                 attrs: { "src": '/images/pieces/' + VariantRules.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
 115                                 'class': { 'choice-piece': true, 'board': true },
 116                                 on: { "click": e => { this.play(m); this.choices=[]; } },
 117                             })
 118                         ]
 119                     );
 120                 })
 121             );
 122             // Create board element (+ reserves if needed by variant or mode)
 123             let gameDiv = h('div',
 124                 {
 125                     'class': { 'game': true },
 126                 },
 127                 [_.range(sizeX).map(i => {
 128                     let ci = this.mycolor=='w' ? i : sizeX-i-1;
 129                     return h(
 130                         'div',
 131                         {
 132                             'class': {
 133                                 'row': true,
 134                             },
 135                             style: { 'opacity': this.choices.length>0?"0.5":"1" },
 136                         },
 137                         _.range(sizeY).map(j => {
 138                             let cj = this.mycolor=='w' ? j : sizeY-j-1;
 139                             let elems = [];
 140                             if (this.vr.board[ci][cj] != VariantRules.EMPTY)
 141                             {
 142                                 elems.push(
 143                                     h(
 144                                         'img',
 145                                         {
 146                                             'class': {
 147                                                 'piece': true,
 148                                                 'ghost': !!this.selectedPiece && this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
 149                                             },
 150                                             attrs: {
 151                                                 src: "/images/pieces/" + VariantRules.getPpath(this.vr.board[ci][cj]) + ".svg",
 152                                             },
 153                                         }
 154                                     )
 155                                 );
 156                             }
 157                             if (hintSquares[ci][cj])
 158                             {
 159                                 elems.push(
 160                                     h(
 161                                         'img',
 162                                         {
 163                                             'class': {
 164                                                 'mark-square': true,
 165                                             },
 166                                             attrs: {
 167                                                 src: "/images/mark.svg",
 168                                             },
 169                                         }
 170                                     )
 171                                 );
 172                             }
 173                             const lm = this.vr.lastMove;
 174                             const highlight = !!lm && _.isMatch(lm.end, {x:ci,y:cj});
 175                             const incheck = this.incheck
 176                                 && _.isEqual(this.vr.kingPos[this.vr.turn], [ci,cj]);
 177                             return h(
 178                                 'div',
 179                                 {
 180                                     'class': {
 181                                         'board': true,
 182                                         'light-square': !highlight && (i+j)%2==0,
 183                                         'dark-square': !highlight && (i+j)%2==1,
 184                                         'highlight': highlight,
 185                                         'incheck': incheck,
 186                                     },
 187                                     attrs: {
 188                                         id: this.getSquareId({x:ci,y:cj}),
 189                                     },
 190                                 },
 191                                 elems
 192                             );
 193                         })
 194                     );
 195                 }), choices]
 196             );
 197             actionArray.push(
 198                 h('button',
 199                     {
 200                         on: { click: this.resign },
 201                         attrs: { "aria-label": 'Resign' },
 202                         'class': { "tooltip":true },
 203                     },
 204                     [h('i', { 'class': { "material-icons": true } }, "flag")])
 205             );
 206             elementArray.push(gameDiv);
 207     //          if (!!vr.reserve)
 208     //          {
 209     //              let reserve = h('div',
 210     //                  {'class':{'game':true}}, [
 211     //                      h('div',
 212     //                          { 'class': { 'row': true }},
 213     //                          [
 214     //                              h('div',
 215     //                                  {'class':{'board':true}},
 216     //                                  [h('img',{'class':{"piece":true},attrs:{"src":"/images/pieces/wb.svg"}})]
 217     //                              )
 218     //                          ]
 219     //                      )
 220     //                  ],
 221     //              );
 222     //              elementArray.push(reserve);
 223     //          }
 224             let eogMessage = "Unfinished";
 225             switch (this.score)
 226             {
 227                 case "1-0":
 228                     eogMessage = "White win";
 229                     break;
 230                 case "0-1":
 231                     eogMessage = "Black win";
 232                     break;
 233                 case "1/2":
 234                     eogMessage = "Draw";
 235                     break;
 236             }
 237             let elemsOfEog =
 238             [
 239                 h('label',
 240                     {
 241                         attrs: { "for": "modal-control" },
 242                         "class": { "modal-close": true },
 243                     }
 244                 ),
 245                 h('h3',
 246                     {
 247                         "class": { "section": true },
 248                         domProps: { innerHTML: eogMessage },
 249                     }
 250                 )
 251             ];
 252             if (this.score != "*")
 253             {
 254                 elemsOfEog.push(
 255                     h('p', //'textarea', //TODO: selectable!
 256                         {
 257                             domProps: { innerHTML: this.vr.getPGN(this.mycolor, this.score, this.fenStart) },
 258                             //attrs: { "readonly": true },
 259                         }
 260                     )
 261                 );
 262             }
 263             const modalEog = [
 264                 h('input',
 265                     {
 266                         attrs: { "id": "modal-control", type: "checkbox" },
 267                         "class": { "modal": true },
 268                     }),
 269                 h('div',
 270                     {
 271                         attrs: { "role": "dialog", "aria-labelledby": "dialog-title" },
 272                     },
 273                     [
 274                         h('div',
 275                             {
 276                                 "class": { "card": true, "smallpad": true },
 277                             },
 278                             elemsOfEog
 279                         )
 280                     ]
 281                 )
 282             ];
 283             elementArray = elementArray.concat(modalEog);
 284         }
 285         const modalNewgame = [
 286             h('input',
 287                 {
 288                     attrs: { "id": "modal-control2", type: "checkbox" },
 289                     "class": { "modal": true },
 290                 }),
 291             h('div',
 292                 {
 293                     attrs: { "role": "dialog", "aria-labelledby": "dialog-title" },
 294                 },
 295                 [
 296                     h('div',
 297                         {
 298                             "class": { "card": true, "smallpad": true },
 299                         },
 300                         [
 301                             h('label',
 302                                 {
 303                                     attrs: { "id": "close-newgame", "for": "modal-control2" },
 304                                     "class": { "modal-close": true },
 305                                 }
 306                             ),
 307                             h('h3',
 308                                 {
 309                                     "class": { "section": true },
 310                                     domProps: { innerHTML: "New game" },
 311                                 }
 312                             ),
 313                             h('p',
 314                                 {
 315                                     "class": { "section": true },
 316                                     domProps: { innerHTML: "Waiting for opponent..." },
 317                                 }
 318                             )
 319                         ]
 320                     )
 321                 ]
 322             )
 323         ];
 324         elementArray = elementArray.concat(modalNewgame);
 325         const actions = h('div',
 326             {
 327                 attrs: { "id": "actions" },
 328                 'class': { 'text-center': true },
 329             },
 330             actionArray
 331         );
 332         elementArray.push(actions);
 333         return h(
 334             'div',
 335             {
 336                 'class': {
 337                     "col-sm-12":true,
 338                     "col-md-8":true,
 339                     "col-md-offset-2":true,
 340                     "col-lg-6":true,
 341                     "col-lg-offset-3":true,
 342                 },
 343                 // NOTE: click = mousedown + mouseup --> what about smartphone?!
 344                 on: {
 345                     mousedown: this.mousedown,
 346                     mousemove: this.mousemove,
 347                     mouseup: this.mouseup,
 348                     touchdown: this.mousedown,
 349                     touchmove: this.mousemove,
 350                     touchup: this.mouseup,
 351                 },
 352             },
 353             elementArray
 354         );
 355     },
 356     created: function() {
 357         const url = socketUrl;
 358         const continuation = (localStorage.getItem("variant") === variant);
 359         this.myid = continuation
 360             ? localStorage.getItem("myid")
 361             // random enough (TODO: function)
 362             : (Date.now().toString(36) + Math.random().toString(36).substr(2, 7)).toUpperCase();
 363         this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 364         const socketOpenListener = () => {
 365             if (continuation)
 366             {
 367                 // TODO: check FEN integrity with opponent
 368                 const fen = localStorage.getItem("fen");
 369                 const mycolor = localStorage.getItem("mycolor");
 370                 const oppid = localStorage.getItem("oppid");
 371                 const moves = JSON.parse(localStorage.getItem("moves"));
 372                 this.newGame("human", fen, mycolor, oppid, moves, true);
 373                 // Send ping to server, which answers pong if opponent is connected
 374                 this.conn.send(JSON.stringify({code:"ping", oppid:this.oppId}));
 375             }
 376             else if (localStorage.getItem("newgame") === variant)
 377             {
 378                 // New game request has been cancelled on disconnect
 379                 this.seek = true;
 380                 this.newGame("human");
 381             }
 382         };
 383         const socketMessageListener = msg => {
 384             const data = JSON.parse(msg.data);
 385             switch (data.code)
 386             {
 387                 case "newgame": //opponent found
 388                     this.newGame("human", data.fen, data.color, data.oppid); //oppid: opponent socket ID
 389                     break;
 390                 case "newmove": //..he played!
 391                     this.play(data.move, "animate");
 392                     break;
 393                 case "pong": //sent when opponent stayed online after we disconnected
 394                     this.oppConnected = true;
 395                     break;
 396                 case "resign": //..you won!
 397                     this.endGame(this.mycolor=="w"?"1-0":"0-1");
 398                     break;
 399                 // TODO: also use (dis)connect info to count online players
 400                 case "connect":
 401                 case "disconnect":
 402                     if (this.mode == "human" && this.oppid == data.id)
 403                         this.oppConnected = (data.code == "connect");
 404                     break;
 405             }
 406         };
 407         const socketCloseListener = () => {
 408             console.log("Lost connection -- reconnect");
 409             this.conn = new WebSocket(url + "/?sid=" + this.myid + "&page=" + variant);
 410             this.conn.addEventListener('open', socketOpenListener);
 411             this.conn.addEventListener('message', socketMessageListener);
 412             this.conn.addEventListener('close', socketCloseListener);
 413         };
 414         this.conn.onopen = socketOpenListener;
 415         this.conn.onmessage = socketMessageListener;
 416         this.conn.onclose = socketCloseListener;
 417     },
 418     methods: {
 419         endGame: function(score) {
 420             this.score = score;
 421             let modalBox = document.getElementById("modal-control");
 422             modalBox.checked = true;
 423             //setTimeout(() => { modalBox.checked = false; }, 2000); //disabled, to show PGN
 424             if (this.mode == "human")
 425                 this.clearStorage();
 426             this.mode = "idle";
 427             this.oppid = "";
 428         },
 429         resign: function() {
 430             if (this.mode == "human" && this.oppConnected)
 431             {
 432                 try {
 433                     this.conn.send(JSON.stringify({code: "resign", oppid: this.oppid}));
 434                 } catch (INVALID_STATE_ERR) {
 435                     return; //resign failed for some reason...
 436                 }
 437             }
 438             this.endGame(this.mycolor=="w"?"0-1":"1-0");
 439         },
 440         setStorage: function() {
 441             localStorage.setItem("myid", this.myid);
 442             localStorage.setItem("variant", variant);
 443             localStorage.setItem("mycolor", this.mycolor);
 444             localStorage.setItem("oppid", this.oppid);
 445             localStorage.setItem("fenStart", this.fenStart);
 446             localStorage.setItem("moves", JSON.stringify(this.vr.moves));
 447             localStorage.setItem("fen", this.vr.getFen());
 448         },
 449         updateStorage: function() {
 450             localStorage.setItem("moves", JSON.stringify(this.vr.moves));
 451             localStorage.setItem("fen", this.vr.getFen());
 452         },
 453         clearStorage: function() {
 454             delete localStorage["variant"];
 455             delete localStorage["myid"];
 456             delete localStorage["mycolor"];
 457             delete localStorage["oppid"];
 458             delete localStorage["fenStart"];
 459             delete localStorage["fen"];
 460             delete localStorage["moves"];
 461         },
 462         newGame: function(mode, fenInit, color, oppId, moves, continuation) {
 463             const fen = fenInit || VariantRules.GenRandInitFen();
 464             console.log(fen); //DEBUG
 465             this.score = "*";
 466             if (mode=="human" && !oppId)
 467             {
 468                 // Send game request and wait..
 469                 this.clearStorage(); //in case of
 470                 try {
 471                     this.conn.send(JSON.stringify({code:"newgame", fen:fen}));
 472                 } catch (INVALID_STATE_ERR) {
 473                     return; //nothing achieved
 474                 }
 475                 let modalBox = document.getElementById("modal-control2");
 476                 modalBox.checked = true;
 477                 setTimeout(() => { modalBox.checked = false; }, 2000);
 478                 return;
 479             }
 480             this.vr = new VariantRules(fen, moves || []);
 481             this.mode = mode;
 482             this.fenStart = continuation
 483                 ? localStorage.getItem("fenStart")
 484                 : fen.split(" ")[0]; //Only the position matters
 485             if (mode=="human")
 486             {
 487                 // Opponent found!
 488                 if (!continuation)
 489                 {
 490                     // Playing sound fails on game continuation:
 491                     new Audio("/sounds/newgame.mp3").play();
 492                     document.getElementById("modal-control2").checked = false;
 493                 }
 494                 this.oppid = oppId;
 495                 this.oppConnected = true;
 496                 this.mycolor = color;
 497                 this.seek = false;
 498                 if (!!moves && moves.length > 0) //imply continuation
 499                 {
 500                     const oppCol = this.vr.turn;
 501                     const lastMove = moves[moves.length-1];
 502                     this.vr.undo(lastMove);
 503                     this.incheck = this.vr.underCheck(lastMove, oppCol);
 504                     this.vr.play(lastMove, "ingame");
 505                 }
 506                 delete localStorage["newgame"];
 507                 this.setStorage(); //in case of interruptions
 508             }
 509             else //against computer
 510             {
 511                 this.mycolor = Math.random() < 0.5 ? 'w' : 'b';
 512                 if (this.mycolor == 'b')
 513                     setTimeout(this.playComputerMove, 500);
 514             }
 515         },
 516         playComputerMove: function() {
 517             const compColor = this.mycolor=='w' ? 'b' : 'w';
 518             const compMove = this.vr.getComputerMove(compColor);
 519             // HACK: avoid selecting elements before they appear on page:
 520             setTimeout(() => this.play(compMove, "animate"), 500);
 521         },
 522         // Get the identifier of a HTML table cell from its numeric coordinates o.x,o.y.
 523         getSquareId: function(o) {
 524             // NOTE: a separator is required to allow any size of board
 525             return  "sq-" + o.x + "-" + o.y;
 526         },
 527         // Inverse function
 528         getSquareFromId: function(id) {
 529             let idParts = id.split('-');
 530             return [parseInt(idParts[1]), parseInt(idParts[2])];
 531         },
 532         mousedown: function(e) {
 533             e = e || window.event;
 534             e.preventDefault(); //disable native drag & drop
 535             if (!this.selectedPiece && e.target.classList.contains("piece"))
 536             {
 537                 // Next few lines to center the piece on mouse cursor
 538                 let rect = e.target.parentNode.getBoundingClientRect();
 539                 this.start = {
 540                     x: rect.x + rect.width/2,
 541                     y: rect.y + rect.width/2,
 542                     id: e.target.parentNode.id
 543                 };
 544                 this.selectedPiece = e.target.cloneNode();
 545                 this.selectedPiece.style.position = "absolute";
 546                 this.selectedPiece.style.top = 0;
 547                 this.selectedPiece.style.display = "inline-block";
 548                 this.selectedPiece.style.zIndex = 3000;
 549                 let startSquare = this.getSquareFromId(e.target.parentNode.id);
 550                 this.possibleMoves = this.vr.canIplay(this.mycolor,startSquare)
 551                     ? this.vr.getPossibleMovesFrom(startSquare)
 552                     : [];
 553                 e.target.parentNode.appendChild(this.selectedPiece);
 554             }
 555         },
 556         mousemove: function(e) {
 557             if (!this.selectedPiece)
 558                 return;
 559             e = e || window.event;
 560             // If there is an active element, move it around
 561             if (!!this.selectedPiece)
 562             {
 563                 this.selectedPiece.style.left = (e.clientX-this.start.x) + "px";
 564                 this.selectedPiece.style.top = (e.clientY-this.start.y) + "px";
 565             }
 566         },
 567         mouseup: function(e) {
 568             if (!this.selectedPiece)
 569                 return;
 570             e = e || window.event;
 571             // Read drop target (or parentElement, parentNode... if type == "img")
 572             this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coordinates
 573             let landing = document.elementFromPoint(e.clientX, e.clientY);
 574             this.selectedPiece.style.zIndex = 3000;
 575             while (landing.tagName == "IMG") //classList.contains(piece) fails because of mark/highlight
 576                 landing = landing.parentNode;
 577             if (this.start.id == landing.id) //a click: selectedPiece and possibleMoves already filled
 578                 return;
 579             // OK: process move attempt
 580             let endSquare = this.getSquareFromId(landing.id);
 581             let moves = this.findMatchingMoves(endSquare);
 582             this.possibleMoves = [];
 583             if (moves.length > 1)
 584                 this.choices = moves;
 585             else if (moves.length==1)
 586                 this.play(moves[0]);
 587             // Else: impossible move
 588             this.selectedPiece.parentNode.removeChild(this.selectedPiece);
 589             delete this.selectedPiece;
 590             this.selectedPiece = null;
 591         },
 592         findMatchingMoves: function(endSquare) {
 593             // Run through moves list and return the matching set (if promotions...)
 594             let moves = [];
 595             this.possibleMoves.forEach(function(m) {
 596                 if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
 597                     moves.push(m);
 598             });
 599             return moves;
 600         },
 601         animateMove: function(move) {
 602             let startSquare = document.getElementById(this.getSquareId(move.start));
 603             let endSquare = document.getElementById(this.getSquareId(move.end));
 604             let rectStart = startSquare.getBoundingClientRect();
 605             let rectEnd = endSquare.getBoundingClientRect();
 606             let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
 607             let movingPiece = document.querySelector("#" + this.getSquareId(move.start) + " > img.piece");
 608             // HACK for animation (otherwise with positive translate, image slides "under background"...)
 609             // Possible improvement: just alter squares on the piece's way...
 610             squares = document.getElementsByClassName("board");
 611             for (let i=0; i<squares.length; i++)
 612             {
 613                 let square = squares.item(i);
 614                 if (square.id != this.getSquareId(move.start))
 615                     square.style.zIndex = "-1";
 616             }
 617             movingPiece.style.transform = "translate(" + translation.x + "px," + translation.y + "px)";
 618             movingPiece.style.transitionDuration = "0.2s";
 619             movingPiece.style.zIndex = "3000";
 620             setTimeout( () => {
 621                 for (let i=0; i<squares.length; i++)
 622                     squares.item(i).style.zIndex = "auto";
 623                 movingPiece.style = {}; //required e.g. for 0-0 with KR swap
 624                 this.play(move);
 625             }, 200);
 626         },
 627         play: function(move, programmatic) {
 628             if (!!programmatic) //computer or human opponent
 629             {
 630                 this.animateMove(move);
 631                 return;
 632             }
 633             const oppCol = this.vr.getOppCol(this.vr.turn);
 634             this.incheck = this.vr.underCheck(move, oppCol); //is opponent in check?
 635             // Not programmatic, or animation is over
 636             if (this.mode == "human" && this.vr.turn == this.mycolor)
 637             {
 638                 if (!this.oppConnected)
 639                     return; //abort move if opponent is gone
 640                 try {
 641                     this.conn.send(JSON.stringify({code:"newmove", move:move, oppid:this.oppid}));
 642                 } catch(INVALID_STATE_ERR) {
 643                     return; //abort also if sending failed
 644                 }
 645             }
 646             new Audio("/sounds/chessmove1.mp3").play();
 647             this.vr.play(move, "ingame");
 648             if (this.mode == "human")
 649                 this.updateStorage(); //after our moves and opponent moves
 650             const eog = this.vr.checkGameOver(this.vr.turn);
 651             if (eog != "*")
 652                 this.endGame(eog);
 653             else if (this.mode == "computer" && this.vr.turn != this.mycolor)
 654                 setTimeout(this.playComputerMove, 500);
 655         },
 656     },
 657 })