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