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 //          onClick :: ask full game to remote player, and register as an observer in game
   5 //          (use gameId to communicate)
   6 //          on landing on game :: if gameId not found locally, check remotely
   7 //          ==> il manque un param dans game : "remoteId"
   8 Vue.component('my-game', {
   9     // gameId: to find the game in storage (assumption: it exists)
  10     // fen: to start from a FEN without identifiers (analyze mode)
  11     // subMode: "auto" (game comp vs comp) or "corr" (correspondance game),
  12     // or "examine" (after human game: TODO)
  13     props: ["conn","gameRef","fen","mode","subMode",
  14         "allowChat","allowMovelist","settings"],
  15     data: function() {
  16         return {
  17             // Web worker to play computer moves without freezing interface:
  18             compWorker: new Worker('/javascripts/playCompMove.js'),
  19             timeStart: undefined, //time when computer starts thinking
  20             vr: null, //VariantRules object, describing the game state + rules
  21             endgameMessage: "",
  22             orientation: "w",
  23             lockCompThink: false, //used to avoid some ghost moves
  24             myname: user.name, //may be anonymous (thus no name)
  25             opponents: {}, //filled later (potentially 2 or 3 opponents)
  26             drawOfferSent: false, //did I just ask for draw?
  27             people: {}, //observers
  28             score: "*", //'*' means 'unfinished'
  29             // userColor: given by gameId, or fen in problems mode (if no game Id)...
  30             mycolor: "w",
  31             fenStart: "",
  32             moves: [], //TODO: initialize if gameId is defined...
  33             cursor: -1, //index of the move just played
  34             lastMove: null,
  35         };
  36     },
  37     watch: {
  38         fen: function() {
  39             // (Security) No effect if a computer move is in progress:
  40             if (this.mode == "computer" && this.lockCompThink)
  41                 return this.$emit("computer-think");
  42             this.newGameFromFen();
  43         },
  44         gameRef: function() {
  45             this.loadGame();
  46         },
  47     },
  48     computed: {
  49         showChat: function() {
  50             return this.allowChat && this.mode=='human' && this.score != '*';
  51         },
  52         showMoves: function() {
  53             return true;
  54             return this.allowMovelist && window.innerWidth >= 768;
  55         },
  56         showFen: function() {
  57             return variant.name != "Dark" || this.score != "*";
  58         },
  59     },
  60     // Modal end of game, and then sub-components
  61     template: `
  62         <div class="col-sm-12 col-md-10 col-md-offset-1 col-lg-8 col-lg-offset-2">
  63             <input id="modal-eog" type="checkbox" class="modal"/>
  64             <div role="dialog" aria-labelledby="eogMessage">
  65                 <div class="card smallpad small-modal text-center">
  66                     <label for="modal-eog" class="modal-close">
  67                     </label>
  68                     <h3 id="eogMessage" class="section">
  69                         {{ endgameMessage }}
  70                     </h3>
  71                 </div>
  72             </div>
  73             <my-chat v-if="showChat" :conn="conn" :myname="myname"
  74                 :opponents="opponents" :people="people">
  75             </my-chat>
  76             <my-board v-bind:vr="vr" :last-move="lastMove" :mode="mode"
  77                 :orientation="orientation" :user-color="mycolor" :settings="settings"
  78                 @play-move="play">
  79             </my-board>
  80             <div class="button-group">
  81                 <button @click="() => play()">Play</button>
  82                 <button @click="() => undo()">Undo</button>
  83                 <button @click="flip">Flip</button>
  84                 <button @click="gotoBegin">GotoBegin</button>
  85                 <button @click="gotoEnd">GotoEnd</button>
  86             </div>
  87             <div v-if="mode=='human'" class="button-group">
  88                 <button @click="offerDraw">Draw</button>
  89                 <button @click="abortGame">Abort</button>
  90                 <button @click="resign">Resign</button>
  91             </div>
  92             <div v-if="mode=='human' && subMode=='corr'">
  93                 <textarea v-show="score=='*' && vr.turn==mycolor" v-model="corrMsg">
  94                 </textarea>
  95                 <div v-show="cursor>=0">
  96                     {{ moves[cursor].message }}
  97                 </div>
  98             </div>
  99             <div v-if="showFen && !!vr" id="fen-div" class="section-content">
 100                 <p id="fen-string" class="text-center">
 101                     {{ vr.getFen() }}
 102                 </p>
 103             </div>
 104             <div id="pgn-div" class="section-content">
 105                 <a id="download" href="#">
 106                 </a>
 107                 <div class="button-group">
 108                     <button id="downloadBtn" @click="download">
 109                         {{ translate("Download PGN") }}
 110                     </button>
 111                     <button>Import game</button>
 112                 </div>
 113             </div>
 114             <my-move-list v-if="showMoves" :moves="moves" :cursor="cursor" @goto-move="gotoMove">
 115             </my-move-list>
 116         </div>
 117     `,
 118     created: function() {
 119         if (!!this.gameRef)
 120             this.loadGame();
 121         else if (!!this.fen)
 122         {
 123             this.vr = new V(this.fen);
 124             this.fenStart = this.fen;
 125         }
 126         // TODO: if I'm one of the players in game, then:
 127         // Send ping to server (answer pong if opponent is connected)
 128         if (true && !!this.conn && !!this.gameRef)
 129         {
 130             this.conn.onopen = () => {
 131                 this.conn.send(JSON.stringify({
 132                     code:"ping",oppid:this.oppid,gameId:this.gameRef.id}));
 133             };
 134         }
 135         // TODO: also handle "draw accepted" (use opponents array?)
 136         // --> must give this info also when sending lastState...
 137         // and, if all players agree then OK draw (end game ...etc)
 138         const socketMessageListener = msg => {
 139             const data = JSON.parse(msg.data);
 140             let L = undefined;
 141             switch (data.code)
 142             {
 143                 case "newmove": //..he played!
 144                     this.play(data.move, variant.name!="Dark" ? "animate" : null);
 145                     break;
 146                 case "pong": //received if we sent a ping (game still alive on our side)
 147                     if (this.gameRef.id != data.gameId)
 148                         break; //games IDs don't match: definitely over...
 149                     this.oppConnected = true;
 150                     // Send our "last state" informations to opponent(s)
 151                     L = this.vr.moves.length;
 152                     Object.keys(this.opponents).forEach(oid => {
 153                         this.conn.send(JSON.stringify({
 154                             code: "lastate",
 155                             oppid: oid,
 156                             gameId: this.gameRef.id,
 157                             lastMove: (L>0?this.vr.moves[L-1]:undefined),
 158                             movesCount: L,
 159                         }));
 160                     });
 161                     break;
 162                 // TODO: refactor this, because at 3 or 4 players we may have missed 2 or 3 moves (not just one)
 163                 case "lastate": //got opponent infos about last move
 164                     L = this.vr.moves.length;
 165                     if (this.gameRef.id != data.gameId)
 166                         break; //games IDs don't match: nothing we can do...
 167                     // OK, opponent still in game (which might be over)
 168                     if (this.score != "*")
 169                     {
 170                         // We finished the game (any result possible)
 171                         this.conn.send(JSON.stringify({
 172                             code: "lastate",
 173                             oppid: data.oppid,
 174                             gameId: this.gameRef.id,
 175                             score: this.score,
 176                         }));
 177                     }
 178                     else if (!!data.score) //opponent finished the game
 179                         this.endGame(data.score);
 180                     else if (data.movesCount < L)
 181                     {
 182                         // We must tell last move to opponent
 183                         this.conn.send(JSON.stringify({
 184                             code: "lastate",
 185                             oppid: this.opponent.id,
 186                             gameId: this.gameRef.id,
 187                             lastMove: this.vr.moves[L-1],
 188                             movesCount: L,
 189                         }));
 190                     }
 191                     else if (data.movesCount > L) //just got last move from him
 192                         this.play(data.lastMove, "animate");
 193                     break;
 194                 case "resign": //..you won!
 195                     this.endGame(this.mycolor=="w"?"1-0":"0-1");
 196                     break;
 197                 // TODO: also use (dis)connect info to count online players?
 198                 case "connect":
 199                 case "disconnect":
 200                     if (this.mode=="human")
 201                     {
 202                         const online = (data.code == "connect");
 203                         // If this is an opponent ?
 204                         if (!!this.opponents[data.id])
 205                             this.opponents[data.id].online = online;
 206                         else
 207                         {
 208                             // Or an observer ?
 209                             if (!online)
 210                                 delete this.people[data.id];
 211                             else
 212                                 this.people[data.id] = data.name;
 213                         }
 214                     }
 215                     break;
 216             }
 217         };
 218         const socketCloseListener = () => {
 219             this.conn.addEventListener('message', socketMessageListener);
 220             this.conn.addEventListener('close', socketCloseListener);
 221         };
 222         if (!!this.conn)
 223         {
 224             this.conn.onmessage = socketMessageListener;
 225             this.conn.onclose = socketCloseListener;
 226         }
 227         // Computer moves web worker logic: (TODO: also for observers in HH games ?)
 228         this.compWorker.postMessage(["scripts",variant.name]);
 229         this.compWorker.onmessage = e => {
 230             this.lockCompThink = true; //to avoid some ghost moves
 231             let compMove = e.data;
 232             if (!Array.isArray(compMove))
 233                 compMove = [compMove]; //to deal with MarseilleRules
 234             // Small delay for the bot to appear "more human"
 235             const delay = Math.max(500-(Date.now()-this.timeStart), 0);
 236             setTimeout(() => {
 237                 const animate = variant.name != "Dark";
 238                 this.play(compMove[0], animate);
 239                 if (compMove.length == 2)
 240                     setTimeout( () => { this.play(compMove[1], animate); }, 750);
 241                 else //250 == length of animation (TODO: should be a constant somewhere)
 242                     setTimeout( () => this.lockCompThink = false, 250);
 243             }, delay);
 244         }
 245     },
 246     // dans variant.js (plutôt room.js) conn gère aussi les challenges
 247     // et les chats dans chat.js. Puis en webRTC, repenser tout ça.
 248     methods: {
 249         offerDraw: function() {
 250             if (!confirm("Offer draw?"))
 251                 return;
 252             // Stay in "draw offer sent" state until next move is played
 253             this.drawOfferSent = true;
 254             if (this.subMode == "corr")
 255             {
 256                 // TODO: set drawOffer on in game (how ?)
 257             }
 258             else //live game
 259             {
 260                 this.opponents.forEach(o => {
 261                     if (!!o.online)
 262                     {
 263                         try {
 264                             this.conn.send(JSON.stringify({code: "draw", oppid: o.id}));
 265                         } catch (INVALID_STATE_ERR) {
 266                             return;
 267                         }
 268                     }
 269                 });
 270             }
 271         },
 272         // + conn handling: "draw" message ==> agree for draw (if we have "drawOffered" at true)
 273         receiveDrawOffer: function() {
 274             //if (...)
 275             // TODO: ignore if preventDrawOffer is set; otherwise show modal box with option "prevent future offers"
 276             // if accept: send message "draw"
 277         },
 278         abortGame: function() {
 279             if (!confirm("Abort the game?"))
 280                 return;
 281             //+ bouton "abort" avec score == "?" + demander confirmation pour toutes ces actions,
 282             //send message: "gameOver" avec score "?"
 283         },
 284         resign: function(e) {
 285             if (!confirm("Resign the game?"))
 286                 return;
 287             if (this.mode == "human" && this.oppConnected(this.oppid))
 288             {
 289                 try {
 290                     this.conn.send(JSON.stringify({code: "resign", oppid: this.oppid}));
 291                 } catch (INVALID_STATE_ERR) {
 292                     return;
 293                 }
 294             }
 295             this.endGame(this.mycolor=="w"?"0-1":"1-0");
 296         },
 297         translate: translate,
 298         newGameFromFen: function() {
 299             this.vr = new V(this.fen);
 300             this.moves = [];
 301             this.cursor = -1;
 302             this.fenStart = this.fen;
 303             this.score = "*";
 304             if (this.mode == "analyze")
 305             {
 306                 this.mycolor = V.ParseFen(this.fen).turn;
 307                 this.orientation = this.mycolor;
 308             }
 309             else if (this.mode == "computer") //only other alternative (HH with gameId)
 310             {
 311                 this.mycolor = (Math.random() < 0.5 ? "w" : "b");
 312                 this.orientation = this.mycolor;
 313                 this.compWorker.postMessage(["init",this.fen]);
 314                 if (this.mycolor != "w" || this.subMode == "auto")
 315                     this.playComputerMove();
 316             }
 317         },
 318         loadGame: function() {
 319             // TODO: ask game to remote peer if this.remoteId is set
 320             // (or just if game not found locally)
 321             // NOTE: if it's a corr game, ask it from server
 322             const game = getGameFromStorage(this.gameRef.id, this.gameRef.uid); //uid may be blank
 323             this.opponent.id = game.oppid; //opponent ID in case of running HH game
 324             this.opponent.name = game.oppname; //maye be blank (if anonymous)
 325             this.score = game.score;
 326             this.mycolor = game.mycolor;
 327             this.fenStart = game.fenStart;
 328             this.moves = game.moves;
 329             this.cursor = game.moves.length-1;
 330             this.lastMove = (game.moves.length > 0 ? game.moves[this.cursor] : null);
 331         },
 332         setEndgameMessage: function(score) {
 333             let eogMessage = "Undefined";
 334             switch (score)
 335             {
 336                 case "1-0":
 337                     eogMessage = translations["White win"];
 338                     break;
 339                 case "0-1":
 340                     eogMessage = translations["Black win"];
 341                     break;
 342                 case "1/2":
 343                     eogMessage = translations["Draw"];
 344                     break;
 345                 case "?":
 346                     eogMessage = "Unfinished";
 347                     break;
 348             }
 349             this.endgameMessage = eogMessage;
 350         },
 351         download: function() {
 352             const content = this.getPgn();
 353             // Prepare and trigger download link
 354             let downloadAnchor = document.getElementById("download");
 355             downloadAnchor.setAttribute("download", "game.pgn");
 356             downloadAnchor.href = "data:text/plain;charset=utf-8," + encodeURIComponent(content);
 357             downloadAnchor.click();
 358         },
 359         getPgn: function() {
 360             let pgn = "";
 361             pgn += '[Site "vchess.club"]\n';
 362             const opponent = (this.mode=="human" ? "Anonymous" : "Computer");
 363             pgn += '[Variant "' + variant.name + '"]\n';
 364             pgn += '[Date "' + getDate(new Date()) + '"]\n';
 365             const whiteName = ["human","computer"].includes(this.mode)
 366                 ? (this.mycolor=='w'?'Myself':opponent)
 367                 : "analyze";
 368             const blackName = ["human","computer"].includes(this.mode)
 369                 ? (this.mycolor=='b'?'Myself':opponent)
 370                 : "analyze";
 371             pgn += '[White "' + whiteName + '"]\n';
 372             pgn += '[Black "' + blackName + '"]\n';
 373             pgn += '[Fen "' + this.fenStart + '"]\n';
 374             pgn += '[Result "' + this.score + '"]\n\n';
 375             let counter = 1;
 376             let i = 0;
 377             while (i < this.moves.length)
 378             {
 379                 pgn += (counter++) + ".";
 380                 for (let color of ["w","b"])
 381                 {
 382                     let move = "";
 383                     while (i < this.moves.length && this.moves[i].color == color)
 384                         move += this.moves[i++].notation[0] + ",";
 385                     move = move.slice(0,-1); //remove last comma
 386                     pgn += move + (i < this.moves.length-1 ? " " : "");
 387                 }
 388             }
 389             return pgn + "\n";
 390         },
 391         showScoreMsg: function(score) {
 392             this.setEndgameMessage(score);
 393             let modalBox = document.getElementById("modal-eog");
 394             modalBox.checked = true;
 395             setTimeout(() => { modalBox.checked = false; }, 2000);
 396         },
 397         endGame: function(score) {
 398             this.score = score;
 399             this.showScoreMsg(score);
 400             if (this.mode == "human")
 401                 localStorage["score"] = score;
 402             this.$emit("game-over");
 403         },
 404         oppConnected: function(uid) {
 405             return this.opponents.any(o => o.id == uidi && o.online);
 406         },
 407         playComputerMove: function() {
 408             this.timeStart = Date.now();
 409             this.compWorker.postMessage(["askmove"]);
 410         },
 411         animateMove: function(move) {
 412             let startSquare = document.getElementById(getSquareId(move.start));
 413             let endSquare = document.getElementById(getSquareId(move.end));
 414             let rectStart = startSquare.getBoundingClientRect();
 415             let rectEnd = endSquare.getBoundingClientRect();
 416             let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
 417             let movingPiece =
 418                 document.querySelector("#" + getSquareId(move.start) + " > img.piece");
 419             // HACK for animation (with positive translate, image slides "under background")
 420             // Possible improvement: just alter squares on the piece's way...
 421             squares = document.getElementsByClassName("board");
 422             for (let i=0; i<squares.length; i++)
 423             {
 424                 let square = squares.item(i);
 425                 if (square.id != getSquareId(move.start))
 426                     square.style.zIndex = "-1";
 427             }
 428             movingPiece.style.transform = "translate(" + translation.x + "px," +
 429                 translation.y + "px)";
 430             movingPiece.style.transitionDuration = "0.2s";
 431             movingPiece.style.zIndex = "3000";
 432             setTimeout( () => {
 433                 for (let i=0; i<squares.length; i++)
 434                     squares.item(i).style.zIndex = "auto";
 435                 movingPiece.style = {}; //required e.g. for 0-0 with KR swap
 436                 this.play(move);
 437             }, 250);
 438         },
 439         play: function(move, programmatic) {
 440             let navigate = !move;
 441             // Forbid playing outside analyze mode when cursor isn't at moves.length-1
 442             // (except if we receive opponent's move, human or computer)
 443             if (!navigate && this.mode != "analyze" && !programmatic
 444                 && this.cursor < this.moves.length-1)
 445             {
 446                 return;
 447             }
 448             if (navigate)
 449             {
 450                 if (this.cursor == this.moves.length-1)
 451                     return; //no more moves
 452                 move = this.moves[this.cursor+1];
 453             }
 454             if (!!programmatic) //computer or (remote) human opponent
 455             {
 456                 if (this.cursor < this.moves.length-1)
 457                     this.gotoEnd(); //required to play the move
 458                 return this.animateMove(move);
 459             }
 460             // Not programmatic, or animation is over
 461             if (this.mode == "human" && this.subMode == "corr" && this.mycolor == this.vr.turn)
 462             {
 463                 // TODO: show confirm box "validate move ?"
 464             }
 465             if (!move.notation)
 466                 move.notation = this.vr.getNotation(move);
 467             if (!move.color)
 468                 move.color = this.vr.turn;
 469             this.vr.play(move);
 470             this.cursor++;
 471             this.lastMove = move;
 472             if (!move.fen)
 473                 move.fen = this.vr.getFen();
 474             if (this.settings.sound == 2)
 475                 new Audio("/sounds/move.mp3").play().catch(err => {});
 476             if (this.mode == "human")
 477             {
 478                 updateStorage(move); //after our moves and opponent moves
 479                 if (this.vr.turn == this.mycolor)
 480                     this.conn.send(JSON.stringify({code:"newmove", move:move, oppid:this.oppid}));
 481             }
 482             else if (this.mode == "computer")
 483             {
 484                 // Send the move to web worker (including his own moves)
 485                 this.compWorker.postMessage(["newmove",move]);
 486             }
 487             if (!navigate && (this.score == "*" || this.mode == "analyze"))
 488             {
 489                 // Stack move on movesList at current cursor
 490                 if (this.cursor == this.moves.length)
 491                     this.moves.push(move);
 492                 else
 493                     this.moves = this.moves.slice(0,this.cursor).concat([move]);
 494             }
 495             // Is opponent in check?
 496             this.incheck = this.vr.getCheckSquares(this.vr.turn);
 497             const score = this.vr.getCurrentScore();
 498             if (score != "*")
 499             {
 500                 if (["human","computer"].includes(this.mode))
 501                     this.endGame(score);
 502                 else //just show score on screen (allow undo)
 503                     this.showScoreMsg(score);
 504             }
 505             // subTurn condition for Marseille (and Avalanche) rules
 506             else if ((this.mode == "computer" && (!this.vr.subTurn || this.vr.subTurn <= 1))
 507                 && (this.subMode == "auto" || this.vr.turn != this.mycolor))
 508             {
 509                 this.playComputerMove();
 510             }
 511             // https://vuejs.org/v2/guide/list.html#Caveats (also for undo)
 512             if (navigate)
 513                 this.$children[0].$forceUpdate(); //TODO!?
 514         },
 515         undo: function(move) {
 516             let navigate = !move;
 517             if (navigate)
 518             {
 519                 if (this.cursor < 0)
 520                     return; //no more moves
 521                 move = this.moves[this.cursor];
 522             }
 523             this.vr.undo(move);
 524             this.cursor--;
 525             this.lastMove = (this.cursor >= 0 ? this.moves[this.cursor] : undefined);
 526             if (this.settings.sound == 2)
 527                 new Audio("/sounds/undo.mp3").play().catch(err => {});
 528             this.incheck = this.vr.getCheckSquares(this.vr.turn);
 529             if (navigate)
 530                 this.$children[0].$forceUpdate(); //TODO!?
 531             else if (this.mode == "analyze") //TODO: can this happen?
 532                 this.moves.pop();
 533         },
 534         gotoMove: function(index) {
 535             this.vr = new V(this.moves[index].fen);
 536             this.cursor = index;
 537             this.lastMove = this.moves[index];
 538         },
 539         gotoBegin: function() {
 540             this.vr = new V(this.fenStart);
 541             this.cursor = -1;
 542             this.lastMove = null;
 543         },
 544         gotoEnd: function() {
 545             this.gotoMove(this.moves.length-1);
 546         },
 547         flip: function() {
 548             this.orientation = V.GetNextCol(this.orientation);
 549         },
 550     },
 551 })