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