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 = V.Options.select.map(select => { return `
 134       <div class="option-select">
 135         <label for="var_${select.variable}">${select.label}</label>
 136         <div class="select">
 137           <select id="var_${select.variable}" data-numeric="1">` +
 138           select.options.map(option => { return `
 139             <option
 140               value="${option.value}"
 141               ${option.value == select.defaut ? " selected" : ""}
 142             >
 143               ${option.label}
 144             </option>`;
 145           }).join("") + `
 146           </select>
 147           <span class="focus"></span>
 148         </div>
 149       </div>`;
 150   }).join("");
 151   optHtml += V.Options.check.map(check => {
 152     return `
 153       <div class="option-check">
 154         <label class="checkbox">
 155           <input id="var_${check.variable}"
 156                  type="checkbox"${check.defaut ? " checked" : ""}/>
 157           <span class="spacer"></span>
 158           <span>${check.label}</span>
 159         </label>
 160       </div>`;
 161   }).join("");
 162   if (V.Options.styles.length >= 1) {
 163     optHtml += '<div class="words">';
 164     let i = 0;
 165     const stylesLength = V.Options.styles.length;
 166     while (i < stylesLength) {
 167       optHtml += '<div class="row">';
 168       for (let j=i; j<i+4; j++) {
 169         if (j == stylesLength)
 170           break;
 171         const style = V.Options.styles[j];
 172         optHtml += `<span onClick="toggleStyle(event, this)">${style}</span>`;
 173       }
 174       optHtml += "</div>";
 175       i += 4;
 176     }
 177     optHtml += "</div>";
 178   }
 179   $.getElementById("gameOptions").innerHTML = optHtml;
 180 }
 181
 182 function getGameLink() {
 183   const vname = $.getElementById("selectVariant").value;
 184   const color = $.getElementById("selectColor").value;
 185   for (const select of $.querySelectorAll("#gameOptions select")) {
 186     let value = select.value;
 187     if (select.attributes["data-numeric"])
 188       value = parseInt(value, 10);
 189     if (value)
 190       options[ select.id.split("_")[1] ] = value;
 191   }
 192   for (const check of $.querySelectorAll("#gameOptions input")) {
 193     if (check.checked)
 194       options[ check.id.split("_")[1] ] = check.checked;
 195   }
 196   send("creategame", {
 197     vname: vname,
 198     player: {sid: sid, name: localStorage.getItem("name"), color: color},
 199     options: options
 200   });
 201 }
 202
 203 function fillGameInfos(gameInfos, oppIndex) {
 204   fetch(`/variants/${gameInfos.vname}/rules.html`)
 205   .then(res => res.text())
 206   .then(txt => {
 207     let htmlContent = `
 208       <div class="players-info">
 209         <p>
 210           <span class="bold">${gameInfos.vdisp}</span>
 211           <span>vs. ${gameInfos.players[oppIndex].name}</span>
 212         </p>
 213       </div>`;
 214     const options = Object.entries(gameInfos.options);
 215     if (options.length > 0) {
 216       htmlContent += '<div class="options-info">';
 217       let i = 0;
 218       while (i < options.length) {
 219         htmlContent += '<div class="row">';
 220         for (let j=i; j<i+4; j++) {
 221           if (j == options.length)
 222             break;
 223           const opt = options[j];
 224           if (!opt[1])
 225             continue;
 226           htmlContent +=
 227             '<span class="option">' +
 228             (opt[1] === true ? opt[0] : `${opt[0]}:${opt[1]}`) + " " +
 229             "</span>";
 230         }
 231         htmlContent += "</div>";
 232         i += 4;
 233       }
 234       htmlContent += "</div>";
 235     }
 236     htmlContent += `
 237       <div class="rules">${txt}</div>
 238       <div class="btn-wrap">
 239         <button onClick="toggleGameInfos()">Back to game</button>
 240       </div>`;
 241     $.getElementById("gameInfos").innerHTML = htmlContent;
 242   });
 243 }
 244
 245 ////////////////
 246 // Communication
 247
 248 let socket, gid, recoAttempt = 0;
 249 const autoReconnectDelay = () => {
 250   return [100, 200, 500, 1000, 3000, 10000, 30000][Math.min(recoAttempt, 6)];
 251 };
 252
 253 function send(code, data, opts) {
 254   opts = opts || {};
 255   const trySend = () => {
 256     if (socket.readyState == 1) {
 257       socket.send(JSON.stringify(Object.assign({code: code}, data)));
 258       if (opts.success)
 259         opts.success();
 260       return true;
 261     }
 262     return false;
 263   };
 264   const firstTry = trySend();
 265   if (!firstTry) {
 266     if (opts.retry) {
 267       // Retry for a few seconds (sending move)
 268       let sendAttempt = 1;
 269       const retryLoop = setInterval(
 270         () => {
 271           if (trySend() || ++sendAttempt >= 3)
 272             clearInterval(retryLoop);
 273           if (sendAttempt >= 3 && opts.error)
 274             opts.error();
 275         },
 276         1000
 277       );
 278     }
 279     else if (opts.error)
 280       opts.error();
 281   }
 282   return firstTry;
 283 }
 284
 285 function copyClipboard(msg) {
 286   navigator.clipboard.writeText(msg);
 287 }
 288 function getWhatsApp(msg) {
 289   return `https://api.whatsapp.com/send?text=${encodeURIComponent(msg)}`;
 290 }
 291
 292 const tryResumeGame = () => {
 293   recoAttempt = 0;
 294   // If a game is found, resume it:
 295   if (localStorage.getItem("gid")) {
 296     gid = localStorage.getItem("gid");
 297     send("getgame",
 298          {gid: gid},
 299          {
 300            retry: true,
 301            error: () => alert("Cannot load game: no connection")
 302          });
 303   }
 304   else {
 305     // If URL indicates "play with a friend", start game:
 306     const hashIdx = document.URL.indexOf('#');
 307     if (hashIdx >= 0) {
 308       const urlParts = $.URL.split('#');
 309       gid = urlParts[1];
 310       localStorage.setItem("gid", gid);
 311       history.replaceState(null, '', urlParts[0]); //hide game ID
 312       send("joingame",
 313            {gid: gid, name: localStorage.getItem("name")},
 314            {
 315              retry: true,
 316              error: () => alert("Cannot load game: no connection")
 317            });
 318     }
 319   }
 320 };
 321
 322 const messageCenter = (msg) => {
 323   const obj = JSON.parse(msg.data);
 324   switch (obj.code) {
 325     // Start new game:
 326     case "gamestart": {
 327       if (document.hidden)
 328         notifyMe("game");
 329       gid = obj.gid;
 330       initializeGame(obj);
 331       break;
 332     }
 333     // Game vs. friend just created on server: share link now
 334     case "gamecreated": {
 335       const link = `${Params.http_server}/#${obj.gid}`;
 336       $.getElementById("gameLink").innerHTML = `
 337         <p>
 338           <a href="${getWhatsApp(link)}">WhatsApp</a>
 339           /
 340           <span onClick="copyClipboard('${link}')">ToClipboard</span>
 341         </p>
 342         <p>${link}</p>
 343       `;
 344       break;
 345     }
 346     // Game vs. friend joined after 1 minute (try again!)
 347     case "jointoolate":
 348       alert("Game no longer available");
 349       break;
 350     // Get infos of a running game (already launched)
 351     case "gameinfo":
 352       initializeGame(obj);
 353       break;
 354     // Tried to resume a game which is now gone:
 355     case "nogame":
 356       localStorage.removeItem("gid");
 357       break;
 358     // Receive opponent's move:
 359     case "newmove":
 360       // Basic check: was it really opponent's turn?
 361       if (vr.turn == playerColor)
 362         break;
 363       if (document.hidden)
 364         notifyMe("move");
 365       vr.playReceivedMove(obj.moves, () => {
 366         if (vr.getCurrentScore(obj.moves[obj.moves.length-1]) != "*") {
 367           localStorage.removeItem("gid");
 368           setTimeout( () => toggleVisible("gameStopped"), 2000 );
 369         }
 370         else
 371           toggleTurnIndicator(true);
 372       });
 373       break;
 374     // Opponent stopped game (draw, abort, resign...)
 375     case "gameover":
 376       toggleVisible("gameStopped");
 377       localStorage.removeItem("gid");
 378       break;
 379     // Opponent cancelled rematch:
 380     case "closerematch":
 381       toggleVisible("newGame");
 382       break;
 383   }
 384 };
 385
 386 const handleError = (err) => {
 387   if (err.code === "ECONNREFUSED") {
 388     removeAllListeners();
 389     alert("Server refused connection. Please reload page later");
 390   }
 391   socket.close();
 392 };
 393
 394 const handleClose = () => {
 395   setTimeout(() => {
 396     removeAllListeners();
 397     connectToWSS();
 398   }, autoReconnectDelay());
 399 };
 400
 401 function removeAllListeners() {
 402   socket.removeEventListener("open", tryResumeGame);
 403   socket.removeEventListener("message", messageCenter);
 404   socket.removeEventListener("error", handleError);
 405   socket.removeEventListener("close", handleClose);
 406 }
 407
 408 function connectToWSS() {
 409   socket =
 410     new WebSocket(`${Params.socket_server}${Params.socket_path}?sid=${sid}`);
 411   socket.addEventListener("open", tryResumeGame);
 412   socket.addEventListener("message", messageCenter);
 413   socket.addEventListener("error", handleError);
 414   socket.addEventListener("close", handleClose);
 415   recoAttempt++;
 416 }
 417 connectToWSS();
 418
 419 ///////////
 420 // Playing
 421
 422 function toggleTurnIndicator(myTurn) {
 423   let indicator =
 424     $.getElementById("boardContainer").querySelector(".chessboard");
 425   if (myTurn)
 426     indicator.style.outline = "thick solid green";
 427   else
 428     indicator.style.outline = "thick solid lightgrey";
 429 }
 430
 431 function notifyMe(code) {
 432   const doNotify = () => {
 433     // NOTE: empty body (TODO?)
 434     new Notification("New " + code, { vibrate: [200, 100, 200] });
 435     new Audio("/assets/new_" + code + ".mp3").play();
 436   }
 437   if (Notification.permission === "granted")
 438     doNotify();
 439   else if (Notification.permission !== "denied") {
 440     Notification.requestPermission().then(permission => {
 441       if (permission === "granted")
 442         doNotify();
 443     });
 444   }
 445 }
 446
 447 let curMoves = [],
 448     lastFen;
 449 const afterPlay = (move) => {
 450   const callbackAfterSend = () => {
 451     curMoves = [];
 452     const result = vr.getCurrentScore(move);
 453     if (result != "*") {
 454       setTimeout(() => {
 455         toggleVisible("gameStopped");
 456         send("gameover", {gid: gid});
 457       }, 2000);
 458     }
 459   };
 460   // Pack into one moves array, then send
 461   curMoves.push(move);
 462   if (vr.turn != playerColor) {
 463     toggleTurnIndicator(false);
 464     send("newmove",
 465          {gid: gid, moves: curMoves, fen: vr.getFen()},
 466          {
 467            retry: true,
 468            success: callbackAfterSend,
 469            error: () => alert("Move not sent: reload page")
 470          });
 471   }
 472 };
 473
 474 let vr, playerColor;
 475 function initializeGame(obj) {
 476   const options = obj.options || {};
 477   import(`/variants/${obj.vname}/class.js`).then(module => {
 478     window.V = module.default;
 479     for (const [k, v] of Object.entries(V.Aliases))
 480       window[k] = v;
 481     // Load CSS. Avoid loading twice the same stylesheet:
 482     const allIds = [].slice.call($.styleSheets).map(s => s.id);
 483     const newId = obj.vname + "_css";
 484     if (!allIds.includes(newId)) {
 485       $.getElementsByTagName("head")[0].insertAdjacentHTML(
 486         "beforeend",
 487         `<link id="${newId}" rel="stylesheet"
 488                href="/variants/${obj.vname}/style.css"/>`);
 489     }
 490     playerColor = (sid == obj.players[0].sid ? "w" : "b");
 491     // Init + remove potential extra DOM elements from a previous game:
 492     document.getElementById("boardContainer").innerHTML = `
 493       <div id="upLeftInfos"
 494            onClick="toggleGameInfos()">
 495         <svg version="1.1"
 496              viewBox="0.5 0.5 100 100">
 497           <g>
 498             <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"/>
 499           </g>
 500         </svg>
 501       </div>
 502       <div id="upRightStop"
 503            onClick="confirmStopGame()">
 504         <svg version="1.1"
 505              viewBox="0 0 533.333 533.333">
 506           <g>
 507             <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"/>
 508           </g>
 509         </svg>
 510       </div>
 511       <div class="resizeable chessboard"></div>`;
 512     vr = new V({
 513       seed: obj.seed, //may be null if FEN already exists (running game)
 514       fen: obj.fen,
 515       element: "boardContainer",
 516       color: playerColor,
 517       afterPlay: afterPlay,
 518       options: options
 519     });
 520     if (!obj.fen) {
 521       // Game creation: both players set FEN, in case of one is offline
 522       send("setfen", {gid: obj.gid, fen: vr.getFen()});
 523       localStorage.setItem("gid", obj.gid);
 524     }
 525     const select = $.getElementById("selectVariant");
 526     obj.vdisp = "";
 527     for (let i=0; i<select.options.length; i++) {
 528       if (select.options[i].value == obj.vname) {
 529         obj.vdisp = select.options[i].text;
 530         break;
 531       }
 532     }
 533     fillGameInfos(obj, playerColor == "w" ? 1 : 0);
 534     if (obj.randvar)
 535       toggleVisible("gameInfos");
 536     else
 537       toggleVisible("boardContainer");
 538     toggleTurnIndicator(vr.turn == playerColor);
 539   });
 540 }
 541
 542 function confirmStopGame() {
 543   if (confirm("Stop game?") && send("gameover", {gid: gid, relay: true})) {
 544     localStorage.removeItem("gid");
 545     toggleVisible("gameStopped");
 546   }
 547 }
 548
 549 function toggleGameInfos() {
 550   if ($.getElementById("gameInfos").style.display == "none")
 551     toggleVisible("gameInfos");
 552   else
 553     toggleVisible("boardContainer");
 554 }
 555
 556 $.body.addEventListener("keydown", (e) => {
 557   if (!localStorage.getItem("gid"))
 558     return;
 559   if (e.keyCode == 27)
 560     confirmStopGame();
 561   else if (e.keyCode == 32) {
 562     e.preventDefault();
 563     toggleGameInfos();
 564   }
 565 });