app.js

   1 let $ = document; //shortcut
   2
   3 ///////////////////
   4 // Initialisations
   5
   6 // https://stackoverflow.com/a/27747377/12660887
   7 function dec2hex (dec) { return dec.toString(16).padStart(2, "0") }
   8 function generateId (len) {
   9   var arr = new Uint8Array((len || 40) / 2)
  10   window.crypto.getRandomValues(arr)
  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 inputName.onblur = () => setActive(false);
  46 inputName.onfocus = () => setActive(true);
  47 inputName.focus();
  48
  49 /////////
  50 // Utils
  51
  52 function setName() {
  53   localStorage.setItem("name", $.getElementById("myName").value);
  54 }
  55
  56 // Turn a "tab" on, and "close" all others
  57 function toggleVisible(element) {
  58   for (elt of document.querySelectorAll('main > div')) {
  59     if (elt.id != element) elt.style.display = "none";
  60     else elt.style.display = "block";
  61   }
  62   if (element == "boardContainer") {
  63     // Avoid smartphone scrolling effects (TODO?)
  64     document.querySelector("html").style.overflow = "hidden";
  65     document.body.style.overflow = "hidden";
  66   }
  67   else {
  68     document.querySelector("html").style.overflow = "visible";
  69     document.body.style.overflow = "visible";
  70     if (element == "newGame") {
  71       // Workaround "superposed texts" effect
  72       inputName.focus();
  73       inputName.blur();
  74     }
  75   }
  76 }
  77
  78 let seek_vname;
  79 function seekGame() {
  80   seek_vname = $.getElementById("selectVariant").value;
  81   send("seekgame", {vname: seek_vname, name: localStorage.getItem("name")});
  82   toggleVisible("pendingSeek");
  83 }
  84 function cancelSeek() {
  85   send("cancelseek", {vname: seek_vname});
  86   toggleVisible("newGame");
  87 }
  88
  89 function sendRematch() {
  90   send("rematch", { gid: gid });
  91   toggleVisible("pendingRematch");
  92 }
  93 function cancelRematch() {
  94   send("norematch", { gid: gid });
  95   toggleVisible("newGame");
  96 }
  97
  98 // Play with a friend (or not ^^)
  99 function showNewGameForm() {
 100   const vname = $.getElementById("selectVariant").value;
 101   if (vname == "_random") alert("Select a variant first");
 102   else {
 103     $.getElementById("gameLink").innerHTML = "";
 104     $.getElementById("selectColor").selectedIndex = 0;
 105     toggleVisible("newGameForm");
 106     import(`/variants/${vname}/class.js`).then(module => {
 107       window.V = module.default;
 108       prepareOptions();
 109     });
 110   }
 111 }
 112 function backToNormalSeek() { toggleVisible("newGame"); }
 113
 114 function toggleStyle(e, word) {
 115   options[word] = !options[word];
 116   e.target.classList.toggle("highlight-word");
 117 }
 118
 119 let options;
 120 function prepareOptions() {
 121   options = {};
 122   let optHtml = V.Options.select.map(select => { return `
 123       <div class="option-select">
 124         <label for="var_${select.variable}">${select.label}</label>
 125         <div class="select">
 126           <select id="var_${select.variable}" data-numeric="1">` +
 127           select.options.map(option => { return `
 128             <option
 129               value="${option.value}"
 130               ${option.value == select.defaut ? " selected" : ""}
 131             >
 132               ${option.label}
 133             </option>`;
 134           }).join("") + `
 135           </select>
 136           <span class="focus"></span>
 137         </div>
 138       </div>`;
 139   }).join("");
 140   optHtml += V.Options.check.map(check => {
 141     return `
 142       <div class="option-check">
 143         <label class="checkbox">
 144           <input id="var_${check.variable}"
 145                  type="checkbox"${check.defaut ? " checked" : ""}/>
 146           <span class="spacer"></span>
 147           <span>${check.label}</span>
 148         </label>
 149       </div>`;
 150   }).join("");
 151   if (V.Options.styles.length >= 1) {
 152     optHtml += '<div class="words">';
 153     let i = 0;
 154     const stylesLength = V.Options.styles.length;
 155     while (i < stylesLength) {
 156       optHtml += '<div class="row">';
 157       for (let j=i; j<i+4; j++) {
 158         if (j == stylesLength) break;
 159         const style = V.Options.styles[j];
 160         optHtml +=
 161           `<span onClick="toggleStyle(event, '${style}')">${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 $.querySelectorAll("#gameOptions input")) {
 180     if (check.checked) options[ check.id.split("_")[1] ] = check.checked;
 181   }
 182   send("creategame", {
 183     vname: vname,
 184     player: { sid: sid, name: localStorage.getItem("name"), color: color },
 185     options: options
 186   });
 187 }
 188
 189 const fillGameInfos = (gameInfos, oppIndex) => {
 190   fetch(`/variants/${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     $.getElementById("gameInfos").innerHTML = htmlContent;
 225   });
 226 };
 227
 228 ////////////////
 229 // Communication
 230
 231 let socket, gid, attempt = 0;
 232 const autoReconnectDelay = () => {
 233   return [100, 200, 500, 1000, 3000, 10000, 30000][Math.min(attempt, 6)];
 234 };
 235
 236 function copyClipboard(msg) { navigator.clipboard.writeText(msg); }
 237 function getWhatsApp(msg) {
 238   return `https://api.whatsapp.com/send?text=${encodeURIComponent(msg)}`;
 239 }
 240
 241 const tryResumeGame = () => {
 242   attempt = 0;
 243   // If a game is found, resume it:
 244   if (localStorage.getItem("gid")) {
 245     gid = localStorage.getItem("gid");
 246     send("getgame", { gid: gid });
 247   }
 248   else {
 249     // If URL indicates "play with a friend", start game:
 250     const hashIdx = document.URL.indexOf('#');
 251     if (hashIdx >= 0) {
 252       const urlParts = $.URL.split('#');
 253       gid = urlParts[1];
 254       send("joingame", { gid: gid, name: localStorage.getItem("name") });
 255       localStorage.setItem("gid", gid);
 256       history.replaceState(null, '', urlParts[0]);
 257     }
 258   }
 259 };
 260
 261 const messageCenter = (msg) => {
 262   const obj = JSON.parse(msg.data);
 263   switch (obj.code) {
 264     // Start new game:
 265     case "gamestart": {
 266       if (document.hidden) notifyMe("game");
 267       gid = obj.gid;
 268       initializeGame(obj);
 269       break;
 270     }
 271     // Game vs. friend just created on server: share link now
 272     case "gamecreated": {
 273       const link = `${Params.http_server}/#${obj.gid}`;
 274       $.getElementById("gameLink").innerHTML = `
 275         <p>
 276           <a href="${getWhatsApp(link)}">WhatsApp</a>
 277           /
 278           <span onClick='copyClipboard("${link}")'>ToClipboard</span>
 279         </p>
 280         <p>${link}</p>
 281       `;
 282       break;
 283     }
 284     // Game vs. friend joined after 1 minute (try again!)
 285     case "jointoolate":
 286       alert("Game no longer available");
 287       break;
 288     // Get infos of a running game (already launched)
 289     case "gameinfo":
 290       initializeGame(obj);
 291       break;
 292     // Tried to resume a game which is now gone:
 293     case "nogame":
 294       localStorage.removeItem("gid");
 295       break;
 296     // Receive opponent's move:
 297     case "newmove":
 298       send("gotmove", {fen: obj.fen, gid: gid});
 299       if (obj.fen == lastFen) break; //got this move already
 300       lastFen = obj.fen;
 301       if (document.hidden) notifyMe("move");
 302       vr.playReceivedMove(obj.moves, () => {
 303         if (vr.getCurrentScore(obj.moves[obj.moves.length-1]) != "*") {
 304           localStorage.removeItem("gid");
 305           setTimeout( () => toggleVisible("gameStopped"), 2000 );
 306         }
 307         else toggleTurnIndicator(true);
 308       });
 309       break;
 310     // The server notifies that it got our move:
 311     case "gotmove":
 312       if (obj.fen == lastFen) {
 313         curMoves = [];
 314         clearTimeout(timeout1);
 315         clearTimeout(timeout2);
 316         clearTimeout(timeout3);
 317         callbackAfterConfirmation();
 318       }
 319       break;
 320     // Opponent stopped game (draw, abort, resign...)
 321     case "gameover":
 322       toggleVisible("gameStopped");
 323       localStorage.removeItem("gid");
 324       break;
 325     // Opponent cancelled rematch:
 326     case "closerematch":
 327       toggleVisible("newGame");
 328       break;
 329   }
 330 };
 331
 332 const handleError = (err) => {
 333   if (err.code === 'ECONNREFUSED') {
 334     removeAllListeners();
 335     alert("Server refused connection. Please reload page later");
 336   }
 337   socket.close();
 338 };
 339
 340 const handleClose = () => {
 341   setTimeout(() => {
 342     removeAllListeners();
 343     connectToWSS();
 344   }, autoReconnectDelay());
 345 };
 346
 347 const removeAllListeners = () => {
 348   socket.removeEventListener("open", tryResumeGame);
 349   socket.removeEventListener("message", messageCenter);
 350   socket.removeEventListener("error", handleError);
 351   socket.removeEventListener("close", handleClose);
 352 };
 353
 354 const connectToWSS = () => {
 355   socket =
 356     new WebSocket(`${Params.socket_server}${Params.socket_path}?sid=${sid}`);
 357   socket.addEventListener("open", tryResumeGame);
 358   socket.addEventListener("message", messageCenter);
 359   socket.addEventListener("error", handleError);
 360   socket.addEventListener("close", handleClose);
 361   attempt++;
 362 };
 363 connectToWSS();
 364
 365 const send = (code, data) => {
 366   socket.send(JSON.stringify(Object.assign({code: code}, data)));
 367 };
 368
 369 ///////////
 370 // Playing
 371
 372 function toggleTurnIndicator(myTurn) {
 373   let indicator = $.getElementById("chessboard");
 374   if (myTurn) indicator.style.outline = "thick solid green";
 375   else indicator.style.outline = "thick solid lightgrey";
 376 }
 377
 378 function notifyMe(code) {
 379   const doNotify = () => {
 380     // NOTE: empty body (TODO?)
 381     new Notification("New " + code, { vibrate: [200, 100, 200] });
 382     new Audio("/assets/new_" + code + ".mp3").play();
 383   }
 384   if (Notification.permission === 'granted') doNotify();
 385   else if (Notification.permission !== 'denied') {
 386     Notification.requestPermission().then(permission => {
 387       if (permission === 'granted') doNotify();
 388     });
 389   }
 390 }
 391
 392 let curMoves = [],
 393     lastFen, lastMove,
 394     timeout1, timeout2, timeout3;
 395 const callbackAfterConfirmation = () => {
 396   const result = vr.getCurrentScore(lastMove);
 397   if (result != "*") {
 398     setTimeout( () => {
 399       toggleVisible("gameStopped");
 400       send("gameover", { gid: gid });
 401     }, 2000);
 402   }
 403 };
 404 const afterPlay = (move) => {
 405   // Pack into one moves array, then send
 406   curMoves.push({
 407     appear: move.appear,
 408     vanish: move.vanish,
 409     start: move.start,
 410     end: move.end
 411   });
 412   lastMove = move;
 413   if (vr.turn != playerColor) {
 414     toggleTurnIndicator(false);
 415     lastFen = vr.getFen();
 416     const sendMove =
 417       () => send("newmove", {gid: gid, moves: curMoves, fen: lastFen});
 418     // Send move until we obtain confirmation or timeout, then callback
 419     sendMove();
 420     timeout1 = setTimeout(sendMove, 500);
 421     timeout2 = setTimeout(sendMove, 1500);
 422     timeout3 = setTimeout(
 423       () => alert("The move may be lost :( Please reload"),
 424       3000);
 425   }
 426 };
 427
 428 // Avoid loading twice the same stylesheet:
 429 const conditionalLoadCSS = (vname) => {
 430   const allIds = [].slice.call($.styleSheets).map(s => s.id);
 431   const newId = vname + "_css";
 432   if (!allIds.includes(newId)) {
 433     $.getElementsByTagName("head")[0].insertAdjacentHTML(
 434       "beforeend",
 435       `<link id="${newId}" rel="stylesheet"
 436              href="/variants/${vname}/style.css"/>`);
 437   }
 438 };
 439
 440 let vr, playerColor;
 441 function initializeGame(obj) {
 442   const options = obj.options || {};
 443   import(`/variants/${obj.vname}/class.js`).then(module => {
 444     window.V = module.default;
 445     conditionalLoadCSS(obj.vname);
 446     playerColor = (sid == obj.players[0].sid ? "w" : "b");
 447     // Init + remove potential extra DOM elements from a previous game:
 448     document.getElementById("boardContainer").innerHTML = `
 449       <div id="upLeftInfos"
 450            onClick="toggleGameInfos()">
 451         <svg version="1.1"
 452              viewBox="0.5 0.5 100 100">
 453           <g>
 454             <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"/>
 455           </g>
 456         </svg>
 457       </div>
 458       <div id="upRightStop"
 459            onClick="confirmStopGame()">
 460         <svg version="1.1"
 461              viewBox="0 0 533.333 533.333">
 462           <g>
 463             <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"/>
 464           </g>
 465         </svg>
 466       </div>
 467       <div class="resizeable" id="chessboard"></div>`;
 468     vr = new V({
 469       seed: obj.seed, //may be null if FEN already exists (running game)
 470       fen: obj.fen,
 471       element: "chessboard",
 472       color: playerColor,
 473       afterPlay: afterPlay,
 474       options: options
 475     });
 476     if (!obj.fen) {
 477       // Game creation
 478       if (playerColor == "w") send("setfen", {gid: obj.gid, fen: vr.getFen()});
 479       localStorage.setItem("gid", obj.gid);
 480     }
 481     const select = $.getElementById("selectVariant");
 482     obj.vdisp = "";
 483     for (let i=0; i<select.options.length; i++) {
 484       if (select.options[i].value == obj.vname) {
 485         obj.vdisp = select.options[i].text;
 486         break;
 487       }
 488     }
 489     fillGameInfos(obj, playerColor == "w" ? 1 : 0);
 490     if (obj.randvar) toggleVisible("gameInfos");
 491     else toggleVisible("boardContainer");
 492     toggleTurnIndicator(vr.turn == playerColor);
 493   });
 494 }
 495
 496 function confirmStopGame() {
 497   if (confirm("Stop game?")) {
 498     send("gameover", { gid: gid, relay: true });
 499     localStorage.removeItem("gid");
 500     toggleVisible("gameStopped");
 501   }
 502 }
 503
 504 function toggleGameInfos() {
 505   if ($.getElementById("gameInfos").style.display == "none")
 506     toggleVisible("gameInfos");
 507   else {
 508     toggleVisible("boardContainer");
 509     // Quickfix for the "vanished piece" bug (move played while on game infos)
 510     vr.setupPieces(); //TODO: understand better
 511   }
 512 }
 513
 514 $.body.addEventListener("keydown", (e) => {
 515   if (!localStorage.getItem("gid")) return;
 516   if (e.keyCode == 27) confirmStopGame();
 517   else if (e.keyCode == 32) {
 518     e.preventDefault();
 519     toggleGameInfos();
 520   }
 521 });