app.js

   1 let $ = document; //shortcut
   2
   3 ///////////////////
   4 // Initialisations
   5
   6 // https://stackoverflow.com/a/27747377/12660887
   7 function generateId (len) {
   8   const dec2hex = (dec) => dec.toString(16).padStart(2, "0");
   9   let arr = new Uint8Array(len / 2); //len/2 because 2 chars per hex value
  10   window.crypto.getRandomValues(arr); //fill with random integers
  11   return Array.from(arr, dec2hex).join('');
  12 }
  13
  14 // Populate variants dropdown list
  15 let dropdown = $.getElementById("selectVariant");
  16 dropdown[0] = new Option("? ? ?", "_random", true, true);
  17 dropdown[0].title = "Random variant";
  18 for (let i = 0; i < variants.length; i++) {
  19   let newOption = new Option(
  20     variants[i].disp || variants[i].name, variants[i].name, false, false);
  21   newOption.title = variants[i].desc;
  22   dropdown[dropdown.length] = newOption;
  23 }
  24
  25 // Ensure that I have a socket ID and a name
  26 if (!localStorage.getItem("sid"))
  27   localStorage.setItem("sid", generateId(8));
  28 if (!localStorage.getItem("name"))
  29   localStorage.setItem("name", "@non" + generateId(4));
  30 const sid = localStorage.getItem("sid");
  31 $.getElementById("myName").value = localStorage.getItem("name");
  32
  33 // "Material" input field name
  34 let inputName = document.getElementById("myName");
  35 let formField = document.getElementById("ng-name");
  36 const setActive = (active) => {
  37   if (active)
  38     formField.classList.add("form-field--is-active");
  39   else {
  40     formField.classList.remove("form-field--is-active");
  41     inputName.value == ''
  42       ? formField.classList.remove("form-field--is-filled")
  43       : formField.classList.add("form-field--is-filled");
  44   }
  45 };
  46 setActive(true);
  47 inputName.onblur = () => setActive(false);
  48 inputName.onfocus = () => setActive(true);
  49
  50 /////////
  51 // Utils
  52
  53 function setName() {
  54   // 'onChange' event on name input text field [HTML]
  55   localStorage.setItem("name", $.getElementById("myName").value);
  56 }
  57
  58 // Turn a "tab" on, and "close" all others
  59 function toggleVisible(element) {
  60   for (elt of document.querySelectorAll("main > div")) {
  61     if (elt.id != element)
  62       elt.style.display = "none";
  63     else
  64       elt.style.display = "block";
  65   }
  66   if (element == "boardContainer") {
  67     // Avoid smartphone scrolling effects (TODO?)
  68     document.querySelector("html").style.overflow = "hidden";
  69     document.body.style.overflow = "hidden";
  70   }
  71   else {
  72     document.querySelector("html").style.overflow = "visible";
  73     document.body.style.overflow = "visible";
  74     // Workaround "superposed texts" effect:
  75     if (element == "newGame")
  76       setActive(false);
  77   }
  78 }
  79
  80 let seek_vname;
  81 function seekGame() {
  82   seek_vname = $.getElementById("selectVariant").value;
  83   if (send("seekgame",
  84            {vname: seek_vname, name: localStorage.getItem("name")})
  85   ) {
  86     toggleVisible("pendingSeek");
  87   }
  88 }
  89 function cancelSeek() {
  90   if (send("cancelseek", {vname: seek_vname}))
  91     toggleVisible("newGame");
  92 }
  93
  94 function sendRematch(random) {
  95   if (send("rematch", {gid: gid, random: !!random}))
  96     toggleVisible("pendingRematch");
  97 }
  98 function cancelRematch() {
  99   if (send("norematch", {gid: gid}))
 100     toggleVisible("newGame");
 101 }
 102
 103 // Play with a friend (or not ^^)
 104 function showNewGameForm() {
 105   const vname = $.getElementById("selectVariant").value;
 106   if (vname == "_random")
 107     alert("Select a variant first");
 108   else {
 109     $.getElementById("gameLink").innerHTML = "";
 110     $.getElementById("selectColor").selectedIndex = 0;
 111     toggleVisible("newGameForm");
 112     import(`/variants/${vname}/class.js`).then(module => {
 113       window.V = module.default;
 114       for (const [k, v] of Object.entries(V.Aliases))
 115         window[k] = v;
 116       prepareOptions();
 117     });
 118   }
 119 }
 120 function backToNormalSeek() {
 121   toggleVisible("newGame");
 122 }
 123
 124 function toggleStyle(event, obj) {
 125   const word = obj.innerHTML;
 126   options[word] = !options[word];
 127   event.target.classList.toggle("highlight-word");
 128 }
 129
 130 let options;
 131 function prepareOptions() {
 132   options = {};
 133   let optHtml = "";
 134   if (V.Options.select) {
 135     optHtml += V.Options.select.map(select => { return `
 136       <div class="option-select">
 137         <label for="var_${select.variable}">${select.label}</label>
 138         <div class="select">
 139           <select id="var_${select.variable}">` +
 140           select.options.map(option => { return `
 141             <option
 142               value="${option.value}"
 143               ${option.value == select.defaut ? " selected" : ""}
 144             >
 145               ${option.label}
 146             </option>`;
 147           }).join("") + `
 148           </select>
 149           <span class="focus"></span>
 150         </div>
 151       </div>`;
 152     }).join("");
 153   }
 154   if (V.Options.input) {
 155     optHtml += V.Options.input.map(input => { return `
 156       <div class="option-input">
 157         <label class="input">
 158           <input id="var_${input.variable}"
 159                  type="${input.type}"
 160                  ${input.type == "checkbox" && input.defaut
 161                    ? "checked"
 162                    : 'value="' + input.defaut + '"'}
 163           />
 164           <span class="spacer"></span>
 165           <span>${input.label}</span>
 166         </label>
 167       </div>`;
 168     }).join("");
 169   }
 170   if (V.Options.styles) {
 171     optHtml += '<div class="words">';
 172     let i = 0;
 173     const stylesLength = V.Options.styles.length;
 174     while (i < stylesLength) {
 175       optHtml += '<div class="row">';
 176       for (let j=i; j<i+4; j++) {
 177         if (j == stylesLength)
 178           break;
 179         const style = V.Options.styles[j];
 180         optHtml += `<span onClick="toggleStyle(event, this)">${style}</span>`;
 181       }
 182       optHtml += "</div>";
 183       i += 4;
 184     }
 185     optHtml += "</div>";
 186   }
 187   $.getElementById("gameOptions").innerHTML = optHtml;
 188 }
 189
 190 function getGameLink() {
 191   const vname = $.getElementById("selectVariant").value;
 192   const color = $.getElementById("selectColor").value;
 193   for (const select of $.querySelectorAll("#gameOptions select")) {
 194     const value = parseInt(select.value, 10) || select.value;
 195     options[ select.id.split("_")[1] ] = value;
 196   }
 197   for (const input of $.querySelectorAll("#gameOptions input")) {
 198     const variable = input.id.split("_")[1];
 199     if (input.type == "number")
 200       options[variable] = parseInt(input.value, 10); //TODO: real numbers?
 201     else if (input.type == "checkbox")
 202       options[variable] = input.checked;
 203   }
 204   send("creategame", {
 205     vname: vname,
 206     player: {sid: sid, name: localStorage.getItem("name"), color: color},
 207     options: options
 208   });
 209 }
 210
 211 function fillGameInfos(gameInfos, oppIndex) {
 212   fetch(`/variants/${gameInfos.vname}/rules.html`)
 213   .then(res => res.text())
 214   .then(txt => {
 215     let htmlContent = `
 216       <div class="players-info">
 217         <p>
 218           <span class="bold">${gameInfos.vdisp}</span>
 219           <span>vs. ${gameInfos.players[oppIndex].name}</span>
 220         </p>
 221       </div>`;
 222     const options = Object.entries(gameInfos.options);
 223     if (options.length > 0) {
 224       htmlContent += '<div class="options-info">';
 225       let i = 0;
 226       while (i < options.length) {
 227         htmlContent += '<div class="row">';
 228         for (let j=i; j<i+4; j++) {
 229           if (j == options.length)
 230             break;
 231           const opt = options[j];
 232           if (!opt[1])
 233             continue;
 234           htmlContent +=
 235             '<span class="option">' +
 236             (opt[1] === true ? opt[0] : `${opt[0]}:${opt[1]}`) + " " +
 237             "</span>";
 238         }
 239         htmlContent += "</div>";
 240         i += 4;
 241       }
 242       htmlContent += "</div>";
 243     }
 244     htmlContent += `
 245       <div class="rules">${txt}</div>
 246       <div class="btn-wrap">
 247         <button onClick="toggleGameInfos()">Back to game</button>
 248       </div>`;
 249     $.getElementById("gameInfos").innerHTML = htmlContent;
 250   });
 251 }
 252
 253 ////////////////
 254 // Communication
 255
 256 let socket, gid, recoAttempt = 0;
 257 const autoReconnectDelay = () => {
 258   return [100, 200, 500, 1000, 3000, 10000, 30000][Math.min(recoAttempt, 6)];
 259 };
 260
 261 function send(code, data, opts) {
 262   opts = opts || {};
 263   const trySend = () => {
 264     if (socket.readyState == 1) {
 265       socket.send(JSON.stringify(Object.assign({code: code}, data)));
 266       if (opts.success)
 267         opts.success();
 268       return true;
 269     }
 270     return false;
 271   };
 272   const firstTry = trySend();
 273   if (!firstTry) {
 274     if (opts.retry) {
 275       // Retry for a few seconds (sending move)
 276       let sendAttempt = 1;
 277       const retryLoop = setInterval(
 278         () => {
 279           if (trySend() || ++sendAttempt >= 3)
 280             clearInterval(retryLoop);
 281           if (sendAttempt >= 3 && opts.error)
 282             opts.error();
 283         },
 284         1000
 285       );
 286     }
 287     else if (opts.error)
 288       opts.error();
 289   }
 290   return firstTry;
 291 }
 292
 293 function copyClipboard(msg) {
 294   navigator.clipboard.writeText(msg);
 295 }
 296 function getWhatsApp(msg) {
 297   return `https://api.whatsapp.com/send?text=${encodeURIComponent(msg)}`;
 298 }
 299
 300 const tryResumeGame = () => {
 301   recoAttempt = 0;
 302   // If a game is found, resume it:
 303   if (localStorage.getItem("gid")) {
 304     gid = localStorage.getItem("gid");
 305     send("getgame",
 306          {gid: gid},
 307          {
 308            retry: true,
 309            error: () => alert("Cannot load game: no connection")
 310          });
 311   }
 312   else {
 313     // If URL indicates "play with a friend", start game:
 314     const hashIdx = document.URL.indexOf('#');
 315     if (hashIdx >= 0) {
 316       const urlParts = $.URL.split('#');
 317       gid = urlParts[1];
 318       localStorage.setItem("gid", gid);
 319       history.replaceState(null, '', urlParts[0]); //hide game ID
 320       send("joingame",
 321            {gid: gid, name: localStorage.getItem("name")},
 322            {
 323              retry: true,
 324              error: () => alert("Cannot load game: no connection")
 325            });
 326     }
 327   }
 328 };
 329
 330 const messageCenter = (msg) => {
 331   const obj = JSON.parse(msg.data);
 332   switch (obj.code) {
 333     // Start new game:
 334     case "gamestart": {
 335       if (document.hidden)
 336         notifyMe("game");
 337       gid = obj.gid;
 338       initializeGame(obj);
 339       break;
 340     }
 341     // Game vs. friend just created on server: share link now
 342     case "gamecreated": {
 343       const link = `${Params.http_server}/#${obj.gid}`;
 344       $.getElementById("gameLink").innerHTML = `
 345         <p>
 346           <a href="${getWhatsApp(link)}">WhatsApp</a>
 347           /
 348           <span onClick="copyClipboard('${link}')">ToClipboard</span>
 349         </p>
 350         <p>${link}</p>
 351       `;
 352       break;
 353     }
 354     // Game vs. friend joined after 1 minute (try again!)
 355     case "jointoolate":
 356       alert("Game no longer available");
 357       break;
 358     // Get infos of a running game (already launched)
 359     case "gameinfo":
 360       initializeGame(obj);
 361       break;
 362     // Tried to resume a game which is now gone:
 363     case "nogame":
 364       localStorage.removeItem("gid");
 365       break;
 366     // Receive opponent's move:
 367     case "newmove":
 368       // Basic check: was it really opponent's turn?
 369       if (vr.turn == playerColor)
 370         break;
 371       if (document.hidden)
 372         notifyMe("move");
 373       vr.playReceivedMove(obj.moves, () => {
 374         if (vr.getCurrentScore(obj.moves[obj.moves.length-1]) != "*") {
 375           localStorage.removeItem("gid");
 376           setTimeout( () => toggleVisible("gameStopped"), 2000 );
 377         }
 378         else
 379           toggleTurnIndicator(true);
 380       });
 381       break;
 382     // Opponent stopped game (draw, abort, resign...)
 383     case "gameover":
 384       toggleVisible("gameStopped");
 385       localStorage.removeItem("gid");
 386       break;
 387     // Opponent cancelled rematch:
 388     case "closerematch":
 389       toggleVisible("newGame");
 390       break;
 391   }
 392 };
 393
 394 const handleError = (err) => {
 395   if (err.code === "ECONNREFUSED") {
 396     removeAllListeners();
 397     alert("Server refused connection. Please reload page later");
 398   }
 399   socket.close();
 400 };
 401
 402 const handleClose = () => {
 403   setTimeout(() => {
 404     removeAllListeners();
 405     connectToWSS();
 406   }, autoReconnectDelay());
 407 };
 408
 409 function removeAllListeners() {
 410   socket.removeEventListener("open", tryResumeGame);
 411   socket.removeEventListener("message", messageCenter);
 412   socket.removeEventListener("error", handleError);
 413   socket.removeEventListener("close", handleClose);
 414 }
 415
 416 function connectToWSS() {
 417   socket =
 418     new WebSocket(`${Params.socket_server}${Params.socket_path}?sid=${sid}`);
 419   socket.addEventListener("open", tryResumeGame);
 420   socket.addEventListener("message", messageCenter);
 421   socket.addEventListener("error", handleError);
 422   socket.addEventListener("close", handleClose);
 423   recoAttempt++;
 424 }
 425 connectToWSS();
 426
 427 ///////////
 428 // Playing
 429
 430 function toggleTurnIndicator(myTurn) {
 431   let indicator =
 432     $.getElementById("boardContainer").querySelector(".chessboard");
 433   if (myTurn)
 434     indicator.style.outline = "thick solid green";
 435   else
 436     indicator.style.outline = "thick solid lightgrey";
 437 }
 438
 439 function notifyMe(code) {
 440   const doNotify = () => {
 441     // NOTE: empty body (TODO?)
 442     new Notification("New " + code, { vibrate: [200, 100, 200] });
 443     new Audio("/assets/new_" + code + ".mp3").play();
 444   }
 445   if (Notification.permission === "granted")
 446     doNotify();
 447   else if (Notification.permission !== "denied") {
 448     Notification.requestPermission().then(permission => {
 449       if (permission === "granted")
 450         doNotify();
 451     });
 452   }
 453 }
 454
 455 let curMoves = [],
 456     lastFen;
 457 const afterPlay = (move_s) => {
 458   const callbackAfterSend = () => {
 459     curMoves = [];
 460     const result = vr.getCurrentScore(move);
 461     if (result != "*") {
 462       setTimeout(() => {
 463         toggleVisible("gameStopped");
 464         send("gameover", {gid: gid});
 465       }, 2000);
 466     }
 467   };
 468   // Pack into one moves array, then send
 469   if (Array.isArray(move_s))
 470     // Array of simple moves (e.g. Chakart)
 471     Array.prototype.push.apply(curMoves, move_s);
 472   else
 473     // Usual case
 474     curMoves.push(move_s);
 475   if (vr.turn != playerColor) {
 476     toggleTurnIndicator(false);
 477     send("newmove",
 478          {gid: gid, moves: curMoves, fen: vr.getFen()},
 479          {
 480            retry: true,
 481            success: callbackAfterSend,
 482            error: () => alert("Move not sent: reload page")
 483          });
 484   }
 485 };
 486
 487 let vr, playerColor;
 488 function initializeGame(obj) {
 489   const options = obj.options || {};
 490   import(`/variants/${obj.vname}/class.js`).then(module => {
 491     window.V = module.default;
 492     for (const [k, v] of Object.entries(V.Aliases))
 493       window[k] = v;
 494     // Load CSS. Avoid loading twice the same stylesheet:
 495     const allIds = [].slice.call($.styleSheets).map(s => s.id);
 496     const newId = obj.vname + "_css";
 497     if (!allIds.includes(newId)) {
 498       $.getElementsByTagName("head")[0].insertAdjacentHTML(
 499         "beforeend",
 500         `<link id="${newId}" rel="stylesheet"
 501                href="/variants/${obj.vname}/style.css"/>`);
 502     }
 503     playerColor = (sid == obj.players[0].sid ? "w" : "b");
 504     // Init + remove potential extra DOM elements from a previous game:
 505     document.getElementById("boardContainer").innerHTML = `
 506       <div id="upLeftInfos"
 507            onClick="toggleGameInfos()">
 508         <svg version="1.1"
 509              viewBox="0.5 0.5 100 100">
 510           <g>
 511             <path d="M50.5,0.5c-27.614,0-50,22.386-50,50c0,27.614,22.386,50,50,50s50-22.386,50-50C100.5,22.886,78.114,0.5,50.5,0.5z M60.5,85.5h-20v-40h20V85.5z M50.5,35.5c-5.523,0-10-4.477-10-10s4.477-10,10-10c5.522,0,10,4.477,10,10S56.022,35.5,50.5,35.5z"/>
 512           </g>
 513         </svg>
 514       </div>
 515       <div id="upRightStop"
 516            onClick="confirmStopGame()">
 517         <svg version="1.1"
 518              viewBox="0 0 533.333 533.333">
 519           <g>
 520             <path d="M528.468,428.468c-0.002-0.002-0.004-0.004-0.006-0.005L366.667,266.666l161.795-161.797 c0.002-0.002,0.004-0.003,0.006-0.005c1.741-1.742,3.001-3.778,3.809-5.946c2.211-5.925,0.95-12.855-3.814-17.62l-76.431-76.43 c-4.765-4.763-11.694-6.024-17.619-3.812c-2.167,0.807-4.203,2.066-5.946,3.807c0,0.002-0.002,0.003-0.005,0.005L266.667,166.666 L104.87,4.869c-0.002-0.002-0.003-0.003-0.005-0.005c-1.743-1.74-3.778-3-5.945-3.807C92.993-1.156,86.065,0.105,81.3,4.869 L4.869,81.3c-4.764,4.765-6.024,11.694-3.813,17.619c0.808,2.167,2.067,4.205,3.808,5.946c0.002,0.001,0.003,0.003,0.005,0.005 l161.797,161.796L4.869,428.464c-0.001,0.002-0.003,0.003-0.004,0.005c-1.741,1.742-3,3.778-3.809,5.945 c-2.212,5.924-0.951,12.854,3.813,17.619L81.3,528.464c4.766,4.765,11.694,6.025,17.62,3.813c2.167-0.809,4.203-2.068,5.946-3.809 c0.001-0.002,0.003-0.003,0.005-0.005l161.796-161.797l161.795,161.797c0.003,0.001,0.005,0.003,0.007,0.004 c1.743,1.741,3.778,3.001,5.944,3.81c5.927,2.212,12.856,0.951,17.619-3.813l76.43-76.432c4.766-4.765,6.026-11.696,3.815-17.62 C531.469,432.246,530.209,430.21,528.468,428.468z"/>
 521           </g>
 522         </svg>
 523       </div>
 524       <div class="chessboard"></div>`;
 525     vr = new V({
 526       seed: obj.seed, //may be null if FEN already exists (running game)
 527       fen: obj.fen,
 528       element: "boardContainer",
 529       color: playerColor,
 530       afterPlay: afterPlay,
 531       options: options
 532     });
 533     if (!obj.fen) {
 534       // Game creation: both players set FEN, in case of one is offline
 535       send("setfen", {gid: obj.gid, fen: vr.getFen()});
 536       localStorage.setItem("gid", obj.gid);
 537     }
 538     const select = $.getElementById("selectVariant");
 539     obj.vdisp = "";
 540     for (let i=0; i<select.options.length; i++) {
 541       if (select.options[i].value == obj.vname) {
 542         obj.vdisp = select.options[i].text;
 543         break;
 544       }
 545     }
 546     fillGameInfos(obj, playerColor == "w" ? 1 : 0);
 547     if (obj.randvar)
 548       toggleVisible("gameInfos");
 549     else
 550       toggleVisible("boardContainer");
 551     toggleTurnIndicator(vr.turn == playerColor);
 552   });
 553 }
 554
 555 function confirmStopGame() {
 556   if (confirm("Stop game?") && send("gameover", {gid: gid, relay: true})) {
 557     localStorage.removeItem("gid");
 558     toggleVisible("gameStopped");
 559   }
 560 }
 561
 562 function toggleGameInfos() {
 563   if ($.getElementById("gameInfos").style.display == "none")
 564     toggleVisible("gameInfos");
 565   else
 566     toggleVisible("boardContainer");
 567 }
 568
 569 $.body.addEventListener("keydown", (e) => {
 570   if (!localStorage.getItem("gid"))
 571     return;
 572   if (e.keyCode == 27)
 573     confirmStopGame();
 574   else if (e.keyCode == 32) {
 575     e.preventDefault();
 576     toggleGameInfos();
 577   }
 578 });