public/javascripts/components/game.js

   1 // Game logic on a variant page: 3 modes, analyze, computer or human
   2 // TODO: envoyer juste "light move", sans FEN ni notation ...etc
   3 // TODO: if I'm an observer and player(s) disconnect/reconnect, how to find me ?
   4 Vue.component('my-game', {
   5     // gameId: to find the game in storage (assumption: it exists)
   6     // fen: to start from a FEN without identifiers (analyze mode)
   7     // subMode: "auto" (game comp vs comp) or "corr" (correspondance game),
   8     // or "examine" (after human game: TODO)
   9     props: ["conn","gameId","fen","mode","subMode","allowChat","allowMovelist",
  10         "queryHash","settings"],
  11     data: function() {
  12         return {
  13             // Web worker to play computer moves without freezing interface:
  14             compWorker: new Worker('/javascripts/playCompMove.js'),
  15             timeStart: undefined, //time when computer starts thinking
  16             vr: null, //VariantRules object, describing the game state + rules
  17             endgameMessage: "",
  18             orientation: "w",
  19             lockCompThink: false, //used to avoid some ghost moves
  20             myname: user.name, //may be anonymous (thus no name)
  21             opponents: {}, //filled later (potentially 2 or 3 opponents)
  22             drawOfferSent: false, //did I just ask for draw?
  23             people: {}, //observers
  24             score: "*", //'*' means 'unfinished'
  25             // userColor: given by gameId, or fen in problems mode (if no game Id)...
  26             mycolor: "w",
  27             fenStart: "",
  28             moves: [], //TODO: initialize if gameId is defined...
  29             cursor: -1, //index of the move just played
  30             lastMove: null,
  31         };
  32     },
  33     watch: {
  34         fen: function(newFen) {
  35             // (Security) No effect if a computer move is in progress:
  36             if (this.mode == "computer" && this.lockCompThink)
  37                 return this.$emit("computer-think");
  38             this.newGameFromFen(newFen);
  39         },
  40         gameId: function() {
  41             this.loadGame();
  42         },
  43         queryHash: function(newQhash) {
  44             // New query hash = "id=42"; get 42 as gameId
  45             this.gameId = parseInt(newQhash.substr(2));
  46             this.loadGame();
  47         },
  48     },
  49     computed: {
  50         showChat: function() {
  51             return this.allowChat && this.mode=='human' && this.score != '*';
  52         },
  53         showMoves: function() {
  54             return true;
  55             return this.allowMovelist && window.innerWidth >= 768;
  56         },
  57         showFen: function() {
  58             return variant.name != "Dark" || this.score != "*";
  59         },
  60     },
  61     // Modal end of game, and then sub-components
  62     template: `
  63         <div class="col-sm-12 col-md-10 col-md-offset-1 col-lg-8 col-lg-offset-2">
  64             <input id="modal-eog" type="checkbox" class="modal"/>
  65             <div role="dialog" aria-labelledby="eogMessage">
  66                 <div class="card smallpad small-modal text-center">
  67                     <label for="modal-eog" class="modal-close">
  68                     </label>
  69                     <h3 id="eogMessage" class="section">
  70                         {{ endgameMessage }}
  71                     </h3>
  72                 </div>
  73             </div>
  74             <my-chat v-if="showChat" :conn="conn" :myname="myname"
  75                 :opponents="opponents" :people="people">
  76             </my-chat>
  77             <my-board v-bind:vr="vr" :last-move="lastMove" :mode="mode"
  78                 :orientation="orientation" :user-color="mycolor" :settings="settings"
  79                 @play-move="play">
  80             </my-board>
  81             <div class="button-group">
  82                 <button @click="() => play()">Play</button>
  83                 <button @click="() => undo()">Undo</button>
  84                 <button @click="flip">Flip</button>
  85                 <button @click="gotoBegin">GotoBegin</button>
  86                 <button @click="gotoEnd">GotoEnd</button>
  87             </div>
  88             <div v-if="mode=='human'" class="button-group">
  89                 <button @click="offerDraw">Draw</button>
  90                 <button @click="abortGame">Abort</button>
  91                 <button @click="resign">Resign</button>
  92             </div>
  93             <div v-if="mode=='human' && subMode=='corr'">
  94                 <textarea v-show="score=='*' && vr.turn==mycolor" v-model="corrMsg">
  95                 </textarea>
  96                 <div v-show="cursor>=0">
  97                     {{ moves[cursor].message }}
  98                 </div>
  99             </div>
 100             <div v-if="showFen && !!vr" id="fen-div" class="section-content">
 101                 <p id="fen-string" class="text-center">
 102                     {{ vr.getFen() }}
 103                 </p>
 104             </div>
 105             <div id="pgn-div" class="section-content">
 106                 <a id="download" href="#">
 107                 </a>
 108                 <button id="downloadBtn" @click="download">
 109                     {{ translate("Download PGN") }}
 110                 </button>
 111             </div>
 112             <my-move-list v-if="showMoves" :moves="moves" :cursor="cursor" @goto-move="gotoMove">
 113             </my-move-list>
 114         </div>
 115     `,
 116     created: function() {
 117         if (!!this.gameId)
 118             this.loadGame();
 119         else if (!!this.fen)
 120         {
 121             this.vr = new VariantRules(this.fen);
 122             this.fenStart = this.fen;
 123         }
 124         // TODO: also handle "draw accepted" (use opponents array?)
 125         // --> must give this info also when sending lastState...
 126         // and, if all players agree then OK draw (end game ...etc)
 127         const socketMessageListener = msg => {
 128             const data = JSON.parse(msg.data);
 129             let L = undefined;
 130             switch (data.code)
 131             {
 132                 case "newmove": //..he played!
 133                     this.play(data.move, variant.name!="Dark" ? "animate" : null);
 134                     break;
 135                 case "pong": //received if we sent a ping (game still alive on our side)
 136                     if (this.gameId != data.gameId)
 137                         break; //games IDs don't match: definitely over...
 138                     this.oppConnected = true;
 139                     // Send our "last state" informations to opponent(s)
 140                     L = this.vr.moves.length;
 141                     Object.keys(this.opponents).forEach(oid => {
 142                         this.conn.send(JSON.stringify({
 143                             code: "lastate",
 144                             oppid: oid,
 145                             gameId: this.gameId,
 146                             lastMove: (L>0?this.vr.moves[L-1]:undefined),
 147                             movesCount: L,
 148                         }));
 149                     });
 150                     break;
 151                 // TODO: refactor this, because at 3 or 4 players we may have missed 2 or 3 moves (not just one)
 152                 case "lastate": //got opponent infos about last move
 153                     L = this.vr.moves.length;
 154                     if (this.gameId != data.gameId)
 155                         break; //games IDs don't match: nothing we can do...
 156                     // OK, opponent still in game (which might be over)
 157                     if (this.score != "*")
 158                     {
 159                         // We finished the game (any result possible)
 160                         this.conn.send(JSON.stringify({
 161                             code: "lastate",
 162                             oppid: data.oppid,
 163                             gameId: this.gameId,
 164                             score: this.score,
 165                         }));
 166                     }
 167                     else if (!!data.score) //opponent finished the game
 168                         this.endGame(data.score);
 169                     else if (data.movesCount < L)
 170                     {
 171                         // We must tell last move to opponent
 172                         this.conn.send(JSON.stringify({
 173                             code: "lastate",
 174                             oppid: this.opponent.id,
 175                             gameId: this.gameId,
 176                             lastMove: this.vr.moves[L-1],
 177                             movesCount: L,
 178                         }));
 179                     }
 180                     else if (data.movesCount > L) //just got last move from him
 181                         this.play(data.lastMove, "animate");
 182                     break;
 183                 case "resign": //..you won!
 184                     this.endGame(this.mycolor=="w"?"1-0":"0-1");
 185                     break;
 186                 // TODO: also use (dis)connect info to count online players?
 187                 case "connect":
 188                 case "disconnect":
 189                     if (this.mode=="human")
 190                     {
 191                         const online = (data.code == "connect");
 192                         // If this is an opponent ?
 193                         if (!!this.opponents[data.id])
 194                             this.opponents[data.id].online = online;
 195                         else
 196                         {
 197                             // Or an observer ?
 198                             if (!online)
 199                                 delete this.people[data.id];
 200                             else
 201                                 this.people[data.id] = data.name;
 202                         }
 203                     }
 204                     break;
 205             }
 206         };
 207         const socketCloseListener = () => {
 208             this.conn.addEventListener('message', socketMessageListener);
 209             this.conn.addEventListener('close', socketCloseListener);
 210         };
 211         if (!!this.conn)
 212         {
 213             this.conn.onmessage = socketMessageListener;
 214             this.conn.onclose = socketCloseListener;
 215         }
 216         // Computer moves web worker logic: (TODO: also for observers in HH games ?)
 217         this.compWorker.postMessage(["scripts",variant.name]);
 218         this.compWorker.onmessage = e => {
 219             this.lockCompThink = true; //to avoid some ghost moves
 220             let compMove = e.data;
 221             if (!Array.isArray(compMove))
 222                 compMove = [compMove]; //to deal with MarseilleRules
 223             // Small delay for the bot to appear "more human"
 224             const delay = Math.max(500-(Date.now()-this.timeStart), 0);
 225             setTimeout(() => {
 226                 const animate = variant.name != "Dark";
 227                 this.play(compMove[0], animate);
 228                 if (compMove.length == 2)
 229                     setTimeout( () => { this.play(compMove[1], animate); }, 750);
 230                 else //250 == length of animation (TODO: should be a constant somewhere)
 231                     setTimeout( () => this.lockCompThink = false, 250);
 232             }, delay);
 233         }
 234     },
 235     // dans variant.js (plutôt room.js) conn gère aussi les challenges
 236     // et les chats dans chat.js. Puis en webRTC, repenser tout ça.
 237     methods: {
 238         offerDraw: function() {
 239             if (!confirm("Offer draw?"))
 240                 return;
 241             // Stay in "draw offer sent" state until next move is played
 242             this.drawOfferSent = true;
 243             if (this.subMode == "corr")
 244             {
 245                 // TODO: set drawOffer on in game (how ?)
 246             }
 247             else //live game
 248             {
 249                 this.opponents.forEach(o => {
 250                     if (!!o.online)
 251                     {
 252                         try {
 253                             this.conn.send(JSON.stringify({code: "draw", oppid: o.id}));
 254                         } catch (INVALID_STATE_ERR) {
 255                             return;
 256                         }
 257                     }
 258                 });
 259             }
 260         },
 261         // + conn handling: "draw" message ==> agree for draw (if we have "drawOffered" at true)
 262         receiveDrawOffer: function() {
 263             //if (...)
 264             // TODO: ignore if preventDrawOffer is set; otherwise show modal box with option "prevent future offers"
 265             // if accept: send message "draw"
 266         },
 267         abortGame: function() {
 268             if (!confirm("Abort the game?"))
 269                 return;
 270             //+ bouton "abort" avec score == "?" + demander confirmation pour toutes ces actions,
 271             //send message: "gameOver" avec score "?"
 272         },
 273         resign: function(e) {
 274             if (!confirm("Resign the game?"))
 275                 return;
 276             if (this.mode == "human" && this.oppConnected(this.oppid))
 277             {
 278                 try {
 279                     this.conn.send(JSON.stringify({code: "resign", oppid: this.oppid}));
 280                 } catch (INVALID_STATE_ERR) {
 281                     return;
 282                 }
 283             }
 284             this.endGame(this.mycolor=="w"?"0-1":"1-0");
 285         },
 286         translate: translate,
 287         newGameFromFen: function(fen) {
 288             this.vr = new VariantRules(fen);
 289             this.moves = [];
 290             this.cursor = -1;
 291             this.fenStart = newFen;
 292             this.score = "*";
 293             if (this.mode == "analyze")
 294             {
 295                 this.mycolor = V.ParseFen(newFen).turn;
 296                 this.orientation = this.mycolor;
 297             }
 298             else if (this.mode == "computer") //only other alternative (HH with gameId)
 299             {
 300                 this.mycolor = (Math.random() < 0.5 ? "w" : "b");
 301                 this.orientation = this.mycolor;
 302                 this.compWorker.postMessage(["init",newFen]);
 303                 if (this.mycolor != "w" || this.subMode == "auto")
 304                     this.playComputerMove();
 305             }
 306         },
 307         loadGame: function() {
 308             const game = getGameFromStorage(this.gameId);
 309             this.opponent.id = game.oppid; //opponent ID in case of running HH game
 310             this.opponent.name = game.oppname; //maye be blank (if anonymous)
 311             this.score = game.score;
 312             this.mycolor = game.mycolor;
 313             this.fenStart = game.fenStart;
 314             this.moves = game.moves;
 315             this.cursor = game.moves.length-1;
 316             this.lastMove = (game.moves.length > 0 ? game.moves[this.cursor] : null);
 317         },
 318         setEndgameMessage: function(score) {
 319             let eogMessage = "Undefined";
 320             switch (score)
 321             {
 322                 case "1-0":
 323                     eogMessage = translations["White win"];
 324                     break;
 325                 case "0-1":
 326                     eogMessage = translations["Black win"];
 327                     break;
 328                 case "1/2":
 329                     eogMessage = translations["Draw"];
 330                     break;
 331                 case "?":
 332                     eogMessage = "Unfinished";
 333                     break;
 334             }
 335             this.endgameMessage = eogMessage;
 336         },
 337         download: function() {
 338             const content = this.getPgn();
 339             // Prepare and trigger download link
 340             let downloadAnchor = document.getElementById("download");
 341             downloadAnchor.setAttribute("download", "game.pgn");
 342             downloadAnchor.href = "data:text/plain;charset=utf-8," + encodeURIComponent(content);
 343             downloadAnchor.click();
 344         },
 345         getPgn: function() {
 346             let pgn = "";
 347             pgn += '[Site "vchess.club"]\n';
 348             const opponent = (this.mode=="human" ? "Anonymous" : "Computer");
 349             pgn += '[Variant "' + variant.name + '"]\n';
 350             pgn += '[Date "' + getDate(new Date()) + '"]\n';
 351             const whiteName = ["human","computer"].includes(this.mode)
 352                 ? (this.mycolor=='w'?'Myself':opponent)
 353                 : "analyze";
 354             const blackName = ["human","computer"].includes(this.mode)
 355                 ? (this.mycolor=='b'?'Myself':opponent)
 356                 : "analyze";
 357             pgn += '[White "' + whiteName + '"]\n';
 358             pgn += '[Black "' + blackName + '"]\n';
 359             pgn += '[Fen "' + this.fenStart + '"]\n';
 360             pgn += '[Result "' + this.score + '"]\n\n';
 361             let counter = 1;
 362             let i = 0;
 363             while (i < this.moves.length)
 364             {
 365                 pgn += (counter++) + ".";
 366                 for (let color of ["w","b"])
 367                 {
 368                     let move = "";
 369                     while (i < this.moves.length && this.moves[i].color == color)
 370                         move += this.moves[i++].notation[0] + ",";
 371                     move = move.slice(0,-1); //remove last comma
 372                     pgn += move + (i < this.moves.length-1 ? " " : "");
 373                 }
 374             }
 375             return pgn + "\n";
 376         },
 377         showScoreMsg: function(score) {
 378             this.setEndgameMessage(score);
 379             let modalBox = document.getElementById("modal-eog");
 380             modalBox.checked = true;
 381             setTimeout(() => { modalBox.checked = false; }, 2000);
 382         },
 383         endGame: function(score) {
 384             this.score = score;
 385             this.showScoreMsg(score);
 386             if (this.mode == "human")
 387                 localStorage["score"] = score;
 388             this.$emit("game-over");
 389         },
 390         oppConnected: function(uid) {
 391             return this.opponents.any(o => o.id == uidi && o.online);
 392         },
 393         playComputerMove: function() {
 394             this.timeStart = Date.now();
 395             this.compWorker.postMessage(["askmove"]);
 396         },
 397         animateMove: function(move) {
 398             let startSquare = document.getElementById(getSquareId(move.start));
 399             let endSquare = document.getElementById(getSquareId(move.end));
 400             let rectStart = startSquare.getBoundingClientRect();
 401             let rectEnd = endSquare.getBoundingClientRect();
 402             let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
 403             let movingPiece =
 404                 document.querySelector("#" + getSquareId(move.start) + " > img.piece");
 405             // HACK for animation (with positive translate, image slides "under background")
 406             // Possible improvement: just alter squares on the piece's way...
 407             squares = document.getElementsByClassName("board");
 408             for (let i=0; i<squares.length; i++)
 409             {
 410                 let square = squares.item(i);
 411                 if (square.id != getSquareId(move.start))
 412                     square.style.zIndex = "-1";
 413             }
 414             movingPiece.style.transform = "translate(" + translation.x + "px," +
 415                 translation.y + "px)";
 416             movingPiece.style.transitionDuration = "0.2s";
 417             movingPiece.style.zIndex = "3000";
 418             setTimeout( () => {
 419                 for (let i=0; i<squares.length; i++)
 420                     squares.item(i).style.zIndex = "auto";
 421                 movingPiece.style = {}; //required e.g. for 0-0 with KR swap
 422                 this.play(move);
 423             }, 250);
 424         },
 425         play: function(move, programmatic) {
 426             let navigate = !move;
 427             // Forbid playing outside analyze mode when cursor isn't at moves.length-1
 428             // (except if we receive opponent's move, human or computer)
 429             if (!navigate && this.mode != "analyze" && !programmatic
 430                 && this.cursor < this.moves.length-1)
 431             {
 432                 return;
 433             }
 434             if (navigate)
 435             {
 436                 if (this.cursor == this.moves.length-1)
 437                     return; //no more moves
 438                 move = this.moves[this.cursor+1];
 439             }
 440             if (!!programmatic) //computer or (remote) human opponent
 441             {
 442                 if (this.cursor < this.moves.length-1)
 443                     this.gotoEnd(); //required to play the move
 444                 return this.animateMove(move);
 445             }
 446             // Not programmatic, or animation is over
 447             if (this.mode == "human" && this.subMode == "corr" && this.mycolor == this.vr.turn)
 448             {
 449                 // TODO: show confirm box "validate move ?"
 450             }
 451             if (!move.notation)
 452                 move.notation = this.vr.getNotation(move);
 453             if (!move.color)
 454                 move.color = this.vr.turn;
 455             this.vr.play(move);
 456             this.cursor++;
 457             this.lastMove = move;
 458             if (!move.fen)
 459                 move.fen = this.vr.getFen();
 460             if (this.settings.sound == 2)
 461                 new Audio("/sounds/move.mp3").play().catch(err => {});
 462             if (this.mode == "human")
 463             {
 464                 updateStorage(move); //after our moves and opponent moves
 465                 if (this.vr.turn == this.mycolor)
 466                     this.conn.send(JSON.stringify({code:"newmove", move:move, oppid:this.oppid}));
 467             }
 468             else if (this.mode == "computer")
 469             {
 470                 // Send the move to web worker (including his own moves)
 471                 this.compWorker.postMessage(["newmove",move]);
 472             }
 473             if (!navigate && (this.score == "*" || this.mode == "analyze"))
 474             {
 475                 // Stack move on movesList at current cursor
 476                 if (this.cursor == this.moves.length)
 477                     this.moves.push(move);
 478                 else
 479                     this.moves = this.moves.slice(0,this.cursor-1).concat([move]);
 480             }
 481             // Is opponent in check?
 482             this.incheck = this.vr.getCheckSquares(this.vr.turn);
 483             const score = this.vr.getCurrentScore();
 484             if (score != "*")
 485             {
 486                 if (["human","computer"].includes(this.mode))
 487                     this.endGame(score);
 488                 else //just show score on screen (allow undo)
 489                     this.showScoreMsg(score);
 490             }
 491             // subTurn condition for Marseille (and Avalanche) rules
 492             else if ((this.mode == "computer" && (!this.vr.subTurn || this.vr.subTurn <= 1))
 493                 && (this.subMode == "auto" || this.vr.turn != this.mycolor))
 494             {
 495                 this.playComputerMove();
 496             }
 497             // https://vuejs.org/v2/guide/list.html#Caveats (also for undo)
 498             if (navigate)
 499                 this.$children[0].$forceUpdate(); //TODO!?
 500         },
 501         undo: function(move) {
 502             let navigate = !move;
 503             if (navigate)
 504             {
 505                 if (this.cursor < 0)
 506                     return; //no more moves
 507                 move = this.moves[this.cursor];
 508             }
 509             this.vr.undo(move);
 510             this.cursor--;
 511             this.lastMove = (this.cursor >= 0 ? this.moves[this.cursor] : undefined);
 512             if (this.settings.sound == 2)
 513                 new Audio("/sounds/undo.mp3").play().catch(err => {});
 514             this.incheck = this.vr.getCheckSquares(this.vr.turn);
 515             if (navigate)
 516                 this.$children[0].$forceUpdate(); //TODO!?
 517             else if (this.mode == "analyze") //TODO: can this happen?
 518                 this.moves.pop();
 519         },
 520         gotoMove: function(index) {
 521             this.vr = new VariantRules(this.moves[index].fen);
 522             this.cursor = index;
 523             this.lastMove = this.moves[index];
 524         },
 525         gotoBegin: function() {
 526             this.vr = new VariantRules(this.fenStart);
 527             this.cursor = -1;
 528             this.lastMove = null;
 529         },
 530         gotoEnd: function() {
 531             this.gotoMove(this.moves.length-1);
 532         },
 533         flip: function() {
 534             this.orientation = V.GetNextCol(this.orientation);
 535         },
 536     },
 537 })