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) formField.classList.add("form-field--is-active");
  38   else {
  39     formField.classList.remove("form-field--is-active");
  40     inputName.value == ''
  41       ? formField.classList.remove("form-field--is-filled")
  42       : formField.classList.add("form-field--is-filled");
  43   }
  44 };
  45 setActive(true);
  46 inputName.onblur = () => setActive(false);
  47 inputName.onfocus = () => setActive(true);
  48
  49 /////////
  50 // Utils
  51
  52 function setName() {
  53   // 'onChange' event on name input text field [HTML]
  54   localStorage.setItem("name", $.getElementById("myName").value);
  55 }
  56
  57 // Turn a "tab" on, and "close" all others
  58 function toggleVisible(element) {
  59   for (elt of document.querySelectorAll("main > div")) {
  60     if (elt.id != element) elt.style.display = "none";
  61     else elt.style.display = "block";
  62   }
  63   if (element == "boardContainer") {
  64     // Avoid smartphone scrolling effects (TODO?)
  65     document.querySelector("html").style.overflow = "hidden";
  66     document.body.style.overflow = "hidden";
  67   }
  68   else {
  69     document.querySelector("html").style.overflow = "visible";
  70     document.body.style.overflow = "visible";
  71     // Workaround "superposed texts" effect:
  72     if (element == "newGame") setActive(false);
  73   }
  74 }
  75
  76 let seek_vname;
  77 function seekGame() {
  78   seek_vname = $.getElementById("selectVariant").value;
  79   if (send("seekgame",
  80            {vname: seek_vname, name: localStorage.getItem("name")})
  81   ) {
  82     toggleVisible("pendingSeek");
  83   }
  84 }
  85 function cancelSeek() {
  86   if (send("cancelseek", {vname: seek_vname})) toggleVisible("newGame");
  87 }
  88
  89 function sendRematch() {
  90   if (send("rematch", {gid: gid})) toggleVisible("pendingRematch");
  91 }
  92 function cancelRematch() {
  93   if (send("norematch", {gid: gid})) toggleVisible("newGame");
  94 }
  95
  96 // Play with a friend (or not ^^)
  97 function showNewGameForm() {
  98   const vname = $.getElementById("selectVariant").value;
  99   if (vname == "_random") alert("Select a variant first");
 100   else {
 101     $.getElementById("gameLink").innerHTML = "";
 102     $.getElementById("selectColor").selectedIndex = 0;
 103     toggleVisible("newGameForm");
 104     import(`/variants/${vname}/class.js`).then(module => {
 105       window.V = module.default;
 106       prepareOptions();
 107     });
 108   }
 109 }
 110 function backToNormalSeek() {
 111   toggleVisible("newGame");
 112 }
 113
 114 function toggleStyle(event, obj) {
 115   const word = obj.innerHTML;
 116   options[word] = !options[word];
 117   event.target.classList.toggle("highlight-word");
 118 }
 119
 120 let options;
 121 function prepareOptions() {
 122   options = {};
 123   let optHtml = V.Options.select.map(select => { return `
 124       <div class="option-select">
 125         <label for="var_${select.variable}">${select.label}</label>
 126         <div class="select">
 127           <select id="var_${select.variable}" data-numeric="1">` +
 128           select.options.map(option => { return `
 129             <option
 130               value="${option.value}"
 131               ${option.value == select.defaut ? " selected" : ""}
 132             >
 133               ${option.label}
 134             </option>`;
 135           }).join("") + `
 136           </select>
 137           <span class="focus"></span>
 138         </div>
 139       </div>`;
 140   }).join("");
 141   optHtml += V.Options.check.map(check => {
 142     return `
 143       <div class="option-check">
 144         <label class="checkbox">
 145           <input id="var_${check.variable}"
 146                  type="checkbox"${check.defaut ? " checked" : ""}/>
 147           <span class="spacer"></span>
 148           <span>${check.label}</span>
 149         </label>
 150       </div>`;
 151   }).join("");
 152   if (V.Options.styles.length >= 1) {
 153     optHtml += '<div class="words">';
 154     let i = 0;
 155     const stylesLength = V.Options.styles.length;
 156     while (i < stylesLength) {
 157       optHtml += '<div class="row">';
 158       for (let j=i; j<i+4; j++) {
 159         if (j == stylesLength) break;
 160         const style = V.Options.styles[j];
 161         optHtml += `<span onClick="toggleStyle(event, this)">${style}</span>`;
 162       }
 163       optHtml += "</div>";
 164       i += 4;
 165     }
 166     optHtml += "</div>";
 167   }
 168   $.getElementById("gameOptions").innerHTML = optHtml;
 169 }
 170
 171 function getGameLink() {
 172   const vname = $.getElementById("selectVariant").value;
 173   const color = $.getElementById("selectColor").value;
 174   for (const select of $.querySelectorAll("#gameOptions select")) {
 175     let value = select.value;
 176     if (select.attributes["data-numeric"]) value = parseInt(value, 10);
 177     if (value) options[ select.id.split("_")[1] ] = value;
 178   }
 179   for (const check of $.querySelectorAll("#gameOptions input")) {
 180     if (check.checked) options[ check.id.split("_")[1] ] = check.checked;
 181   }
 182   send("creategame", {
 183     vname: vname,
 184     player: {sid: sid, name: localStorage.getItem("name"), color: color},
 185     options: options
 186   });
 187 }
 188
 189 function fillGameInfos(gameInfos, oppIndex) {
 190   fetch(`/variants/${gameInfos.vname}/rules.html`)
 191   .then(res => res.text())
 192   .then(txt => {
 193     let htmlContent = `
 194       <div class="players-info">
 195         <p>
 196           <span class="bold">${gameInfos.vdisp}</span>
 197           <span>vs. ${gameInfos.players[oppIndex].name}</span>
 198         </p>
 199       </div>`;
 200     const options = Object.entries(gameInfos.options);
 201     if (options.length > 0) {
 202       htmlContent += '<div class="options-info">';
 203       let i = 0;
 204       while (i < options.length) {
 205         htmlContent += '<div class="row">';
 206         for (let j=i; j<i+4; j++) {
 207           if (j == options.length) break;
 208           const opt = options[j];
 209           htmlContent +=
 210             '<span class="option">' +
 211             (opt[1] === true ? opt[0] : `${opt[0]}:${opt[1]}`) + " " +
 212             "</span>";
 213         }
 214         htmlContent += "</div>";
 215         i += 4;
 216       }
 217       htmlContent += "</div>";
 218     }
 219     htmlContent += `
 220       <div class="rules">${txt}</div>
 221       <div class="btn-wrap">
 222         <button onClick="toggleGameInfos()">Back to game</button>
 223       </div>`;
 224     $.getElementById("gameInfos").innerHTML = htmlContent;
 225   });
 226 }
 227
 228 ////////////////
 229 // Communication
 230
 231 let socket, gid, recoAttempt = 0;
 232 const autoReconnectDelay = () => {
 233   return [100, 200, 500, 1000, 3000, 10000, 30000][Math.min(recoAttempt, 6)];
 234 };
 235
 236 function send(code, data, opts) {
 237   opts = opts || {};
 238   const trySend = () => {
 239     if (socket.readyState == 1) {
 240       socket.send(JSON.stringify(Object.assign({code: code}, data)));
 241       if (opts.success) opts.success();
 242       return true;
 243     }
 244     return false;
 245   };
 246   const firstTry = trySend();
 247   if (!firstTry) {
 248     if (opts.retry) {
 249       // Retry for a few seconds (sending move)
 250       let sendAttempt = 1;
 251       const retryLoop = setInterval(
 252         () => {
 253           if (trySend() || ++sendAttempt >= 3) clearInterval(retryLoop);
 254           if (sendAttempt >= 3 && opts.error) opts.error();
 255         },
 256         1000
 257       );
 258     }
 259     else if (opt.error) opts.error();
 260   }
 261   return firstTry;
 262 }
 263
 264 function copyClipboard(msg) {
 265   navigator.clipboard.writeText(msg);
 266 }
 267 function getWhatsApp(msg) {
 268   return `https://api.whatsapp.com/send?text=${encodeURIComponent(msg)}`;
 269 }
 270
 271 const tryResumeGame = () => {
 272   recoAttempt = 0;
 273   // If a game is found, resume it:
 274   if (localStorage.getItem("gid")) {
 275     gid = localStorage.getItem("gid");
 276     send("getgame",
 277          {gid: gid},
 278          {
 279            retry: true,
 280            error: () => alert("Cannot load game: no connection")
 281          });
 282   }
 283   else {
 284     // If URL indicates "play with a friend", start game:
 285     const hashIdx = document.URL.indexOf('#');
 286     if (hashIdx >= 0) {
 287       const urlParts = $.URL.split('#');
 288       gid = urlParts[1];
 289       localStorage.setItem("gid", gid);
 290       history.replaceState(null, '', urlParts[0]); //hide game ID
 291       send("joingame",
 292            {gid: gid, name: localStorage.getItem("name")},
 293            {
 294              retry: true,
 295              error: () => alert("Cannot load game: no connection")
 296            });
 297     }
 298   }
 299 };
 300
 301 const messageCenter = (msg) => {
 302   const obj = JSON.parse(msg.data);
 303   switch (obj.code) {
 304     // Start new game:
 305     case "gamestart": {
 306       if (document.hidden) notifyMe("game");
 307       gid = obj.gid;
 308       initializeGame(obj);
 309       break;
 310     }
 311     // Game vs. friend just created on server: share link now
 312     case "gamecreated": {
 313       const link = `${Params.http_server}/#${obj.gid}`;
 314       $.getElementById("gameLink").innerHTML = `
 315         <p>
 316           <a href="${getWhatsApp(link)}">WhatsApp</a>
 317           /
 318           <span onClick="copyClipboard('${link}')">ToClipboard</span>
 319         </p>
 320         <p>${link}</p>
 321       `;
 322       break;
 323     }
 324     // Game vs. friend joined after 1 minute (try again!)
 325     case "jointoolate":
 326       alert("Game no longer available");
 327       break;
 328     // Get infos of a running game (already launched)
 329     case "gameinfo":
 330       initializeGame(obj);
 331       break;
 332     // Tried to resume a game which is now gone:
 333     case "nogame":
 334       localStorage.removeItem("gid");
 335       break;
 336     // Receive opponent's move:
 337     case "newmove":
 338       // Basic check: was it really opponent's turn?
 339       if (vr.turn == playerColor) break;
 340       if (document.hidden) notifyMe("move");
 341       vr.playReceivedMove(obj.moves, () => {
 342         if (vr.getCurrentScore(obj.moves[obj.moves.length-1]) != "*") {
 343           localStorage.removeItem("gid");
 344           setTimeout( () => toggleVisible("gameStopped"), 2000 );
 345         }
 346         else toggleTurnIndicator(true);
 347       });
 348       break;
 349     // Opponent stopped game (draw, abort, resign...)
 350     case "gameover":
 351       toggleVisible("gameStopped");
 352       localStorage.removeItem("gid");
 353       break;
 354     // Opponent cancelled rematch:
 355     case "closerematch":
 356       toggleVisible("newGame");
 357       break;
 358   }
 359 };
 360
 361 const handleError = (err) => {
 362   if (err.code === "ECONNREFUSED") {
 363     removeAllListeners();
 364     alert("Server refused connection. Please reload page later");
 365   }
 366   socket.close();
 367 };
 368
 369 const handleClose = () => {
 370   setTimeout(() => {
 371     removeAllListeners();
 372     connectToWSS();
 373   }, autoReconnectDelay());
 374 };
 375
 376 function removeAllListeners() {
 377   socket.removeEventListener("open", tryResumeGame);
 378   socket.removeEventListener("message", messageCenter);
 379   socket.removeEventListener("error", handleError);
 380   socket.removeEventListener("close", handleClose);
 381 }
 382
 383 function connectToWSS() {
 384   socket =
 385     new WebSocket(`${Params.socket_server}${Params.socket_path}?sid=${sid}`);
 386   socket.addEventListener("open", tryResumeGame);
 387   socket.addEventListener("message", messageCenter);
 388   socket.addEventListener("error", handleError);
 389   socket.addEventListener("close", handleClose);
 390   recoAttempt++;
 391 }
 392 connectToWSS();
 393
 394 ///////////
 395 // Playing
 396
 397 function toggleTurnIndicator(myTurn) {
 398   let indicator = $.getElementById("chessboard");
 399   if (myTurn) indicator.style.outline = "thick solid green";
 400   else indicator.style.outline = "thick solid lightgrey";
 401 }
 402
 403 function notifyMe(code) {
 404   const doNotify = () => {
 405     // NOTE: empty body (TODO?)
 406     new Notification("New " + code, { vibrate: [200, 100, 200] });
 407     new Audio("/assets/new_" + code + ".mp3").play();
 408   }
 409   if (Notification.permission === "granted") doNotify();
 410   else if (Notification.permission !== "denied") {
 411     Notification.requestPermission().then(permission => {
 412       if (permission === "granted") doNotify();
 413     });
 414   }
 415 }
 416
 417 let curMoves = [],
 418     lastFen;
 419 const afterPlay = (move) => {
 420   const callbackAfterSend = () => {
 421     curMoves = [];
 422     const result = vr.getCurrentScore(move);
 423     if (result != "*") {
 424       setTimeout(() => {
 425         toggleVisible("gameStopped");
 426         send("gameover", {gid: gid});
 427       }, 2000);
 428     }
 429   };
 430   // Pack into one moves array, then send
 431   curMoves.push({
 432     appear: move.appear,
 433     vanish: move.vanish,
 434     start: move.start,
 435     end: move.end
 436   });
 437   if (vr.turn != playerColor) {
 438     toggleTurnIndicator(false);
 439     send("newmove",
 440          {gid: gid, moves: curMoves, fen: vr.getFen()},
 441          {
 442            retry: true,
 443            success: callbackAfterSend,
 444            error: () => alert("Move not sent: reload page")
 445          });
 446   }
 447 };
 448
 449 let vr, playerColor;
 450 function initializeGame(obj) {
 451   const options = obj.options || {};
 452   import(`/variants/${obj.vname}/class.js`).then(module => {
 453     window.V = module.default;
 454     // Load CSS. Avoid loading twice the same stylesheet:
 455     const allIds = [].slice.call($.styleSheets).map(s => s.id);
 456     const newId = obj.vname + "_css";
 457     if (!allIds.includes(newId)) {
 458       $.getElementsByTagName("head")[0].insertAdjacentHTML(
 459         "beforeend",
 460         `<link id="${newId}" rel="stylesheet"
 461                href="/variants/${obj.vname}/style.css"/>`);
 462     }
 463     playerColor = (sid == obj.players[0].sid ? "w" : "b");
 464     // Init + remove potential extra DOM elements from a previous game:
 465     document.getElementById("boardContainer").innerHTML = `
 466       <div id="upLeftInfos"
 467            onClick="toggleGameInfos()">
 468         <svg version="1.1"
 469              viewBox="0.5 0.5 100 100">
 470           <g>
 471             <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"/>
 472           </g>
 473         </svg>
 474       </div>
 475       <div id="upRightStop"
 476            onClick="confirmStopGame()">
 477         <svg version="1.1"
 478              viewBox="0 0 533.333 533.333">
 479           <g>
 480             <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"/>
 481           </g>
 482         </svg>
 483       </div>
 484       <div class="resizeable" id="chessboard"></div>`;
 485     vr = new V({
 486       seed: obj.seed, //may be null if FEN already exists (running game)
 487       fen: obj.fen,
 488       element: "chessboard",
 489       color: playerColor,
 490       afterPlay: afterPlay,
 491       options: options
 492     });
 493     if (!obj.fen) {
 494       // Game creation: both players set FEN, in case of one is offline
 495       send("setfen", {gid: obj.gid, fen: vr.getFen()});
 496       localStorage.setItem("gid", obj.gid);
 497     }
 498     const select = $.getElementById("selectVariant");
 499     obj.vdisp = "";
 500     for (let i=0; i<select.options.length; i++) {
 501       if (select.options[i].value == obj.vname) {
 502         obj.vdisp = select.options[i].text;
 503         break;
 504       }
 505     }
 506     fillGameInfos(obj, playerColor == "w" ? 1 : 0);
 507     if (obj.randvar) toggleVisible("gameInfos");
 508     else toggleVisible("boardContainer");
 509     toggleTurnIndicator(vr.turn == playerColor);
 510   });
 511 }
 512
 513 function confirmStopGame() {
 514   if (confirm("Stop game?") && send("gameover", {gid: gid, relay: true})) {
 515     localStorage.removeItem("gid");
 516     toggleVisible("gameStopped");
 517   }
 518 }
 519
 520 function toggleGameInfos() {
 521   if ($.getElementById("gameInfos").style.display == "none")
 522     toggleVisible("gameInfos");
 523   else toggleVisible("boardContainer");
 524 }
 525
 526 $.body.addEventListener("keydown", (e) => {
 527   if (!localStorage.getItem("gid")) return;
 528   if (e.keyCode == 27) confirmStopGame();
 529   else if (e.keyCode == 32) {
 530     e.preventDefault();
 531     toggleGameInfos();
 532   }
 533 });