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