client/src/views/Hall.vue

   1 <template lang="pug">
   2 main
   3   input#modalInfo.modal(type="checkbox")
   4   div#infoDiv(
   5     role="dialog"
   6     data-checkbox="modalInfo"
   7   )
   8     .card.text-center
   9       label.modal-close(for="modalInfo")
  10       p(v-html="infoMessage")
  11   input#modalAccept.modal(type="checkbox")
  12   div#acceptDiv(role="dialog")
  13     .card
  14       p.text-center
  15         span.variantName {{ curChallToAccept.vname }}
  16         span {{ curChallToAccept.cadence }}
  17         span {{ st.tr["with"] + " " + curChallToAccept.from.name }}
  18       .diagram(
  19         v-if="!!curChallToAccept.fen"
  20         v-html="tchallDiag"
  21       )
  22       .button-group#buttonsTchall(:style="tchallButtonsMargin()")
  23         button.acceptBtn(@click="decisionChallenge(true)")
  24           span {{ st.tr["Accept challenge?"] }}
  25         button.refuseBtn(@click="decisionChallenge(false)")
  26           span {{ st.tr["Refuse"] }}
  27   input#modalNewgame.modal(
  28     type="checkbox"
  29     @change="cadenceFocusIfOpened($event)"
  30   )
  31   div#newgameDiv(
  32     role="dialog"
  33     data-checkbox="modalNewgame"
  34   )
  35     .card
  36       label#closeNewgame.modal-close(for="modalNewgame")
  37       div(@keyup.enter="issueNewChallenge()")
  38         fieldset
  39           label(for="selectVariant") {{ st.tr["Variant"] }} *
  40           select#selectVariant(
  41             @change="loadNewchallVariant(trySetNewchallDiag)"
  42             v-model="newchallenge.vid"
  43           )
  44             option(
  45               v-for="v in st.variants"
  46               :value="v.id"
  47               :selected="newchallenge.vid==v.id"
  48             )
  49               | {{ v.name }}
  50         fieldset
  51           label(for="cadence") {{ st.tr["Cadence"] }} *
  52           div#predefinedCadences
  53             button(type="button") 15+5
  54             button(type="button") 45+30
  55             button(type="button") 3d
  56             button(type="button") 7d
  57           input#cadence(
  58             type="text"
  59             v-model="newchallenge.cadence"
  60             placeholder="5+0, 1h+30s, 5d ..."
  61           )
  62         fieldset
  63           label(for="selectRandomLevel") {{ st.tr["Randomness"] }} *
  64           select#selectRandomLevel(v-model="newchallenge.randomness")
  65             option(value="0") {{ st.tr["Deterministic"] }}
  66             option(value="1") {{ st.tr["Symmetric random"] }}
  67             option(value="2") {{ st.tr["Asymmetric random"] }}
  68         fieldset
  69           label(for="memorizeChall") {{ st.tr["Memorize"] }}
  70           input#memorizeChall(
  71             type="checkbox"
  72             v-model="newchallenge.memorize"
  73           )
  74         fieldset(v-if="st.user.id > 0")
  75           label(for="selectPlayers") {{ st.tr["Play with"] }}
  76           select#selectPlayersInList(
  77             v-model="newchallenge.to"
  78             @change="changeChallTarget()"
  79           )
  80             option(value="")
  81             option(
  82               v-for="p in Object.values(people)"
  83               v-if="!!p.name"
  84               :value="p.name"
  85             )
  86               | {{ p.name }}
  87           input#selectPlayers(
  88             type="text"
  89             v-model="newchallenge.to"
  90           )
  91         fieldset(v-if="st.user.id > 0 && newchallenge.to.length > 0")
  92           input#inputFen(
  93             placeholder="FEN"
  94             @input="trySetNewchallDiag()"
  95             type="text"
  96             v-model="newchallenge.fen"
  97           )
  98         .diagram(v-html="newchallenge.diag")
  99       button(@click="issueNewChallenge()") {{ st.tr["Send challenge"] }}
 100   input#modalPeople.modal(
 101     type="checkbox"
 102     @click="toggleSocialColor()"
 103   )
 104   div#peopleWrap(
 105     role="dialog"
 106     data-checkbox="modalPeople"
 107   )
 108     .card
 109       label.modal-close(for="modalPeople")
 110       #people
 111         #players
 112           p(
 113             v-for="sid in Object.keys(people)"
 114             v-if="!!people[sid].name"
 115           )
 116             span {{ people[sid].name }}
 117             button.player-action(
 118               v-if="isGamer(sid)"
 119               @click="watchGame(sid)"
 120             )
 121               | {{ st.tr["Observe"] }}
 122             button.player-action(
 123               v-else-if="isFocusedOnHall(sid)"
 124               @click="challenge(sid)"
 125             )
 126               | {{ st.tr["Challenge"] }}
 127           p.anonymous @nonymous ({{ anonymousCount() }})
 128         #chat
 129           Chat(
 130             ref="chatcomp"
 131             @mychat="processChat"
 132             :pastChats="[]"
 133           )
 134         .clearer
 135   .row
 136     .col-sm-12.col-md-10.col-md-offset-1.col-lg-8.col-lg-offset-2
 137       .button-group
 138         button#peopleBtn(onClick="window.doClick('modalPeople')")
 139           | {{ st.tr["Who's there?"] }}
 140         button(@click="showNewchallengeForm()")
 141           | {{ st.tr["New game"] }}
 142   .row(v-if="presetChalls.length > 0")
 143     .col-sm-12.col-md-10.col-md-offset-1.col-lg-8.col-lg-offset-2
 144       h4.text-center {{ st.tr["Preset challenges"] }}
 145       table
 146         thead
 147           tr
 148             th {{ st.tr["Variant"] }}
 149             th {{ st.tr["Cadence"] }}
 150             th {{ st.tr["Random?"] }}
 151             th
 152         tbody
 153           tr(
 154             v-for="pc in presetChalls"
 155             @click="newChallFromPreset(pc)"
 156           )
 157             td {{ pc.vname }}
 158             td {{ pc.cadence }}
 159             td(:class="getRandomnessClass(pc)")
 160             td.remove-preset(@click="removePresetChall($event, pc)")
 161               img(src="/images/icons/delete.svg")
 162   .row
 163     .col-sm-12.col-md-10.col-md-offset-1.col-lg-8.col-lg-offset-2
 164       div#div2
 165         .button-group
 166           button.tabbtn#btnClive(@click="setDisplay('c','live',$event)")
 167             | {{ st.tr["Live challenges"] }}
 168           button.tabbtn#btnCcorr(@click="setDisplay('c','corr',$event)")
 169             | {{ st.tr["Correspondance challenges"] }}
 170         ChallengeList(
 171           v-show="cdisplay=='live'"
 172           :challenges="filterChallenges('live')"
 173           @click-challenge="clickChallenge"
 174         )
 175         ChallengeList(
 176           v-show="cdisplay=='corr'"
 177           :challenges="filterChallenges('corr')"
 178           @click-challenge="clickChallenge"
 179         )
 180       div#div3
 181         .button-group
 182           button.tabbtn#btnGlive(@click="setDisplay('g','live',$event)")
 183             | {{ st.tr["Live games"] }}
 184           button.tabbtn#btnGcorr(@click="setDisplay('g','corr',$event)")
 185             | {{ st.tr["Correspondance games"] }}
 186         GameList(
 187           v-show="gdisplay=='live'"
 188           :games="filterGames('live')"
 189           :show-both="true"
 190           @show-game="showGame"
 191         )
 192         div(v-show="gdisplay=='corr'")
 193           GameList(
 194             :games="filterGames('corr')"
 195             :show-both="true"
 196             @show-game="showGame"
 197           )
 198           button#loadMoreBtn(
 199             v-if="hasMore"
 200             @click="loadMoreCorr()"
 201           )
 202             | {{ st.tr["Load more"] }}
 203 </template>
 204
 205 <script>
 206 import { store } from "@/store";
 207 import { checkChallenge } from "@/data/challengeCheck";
 208 import { notify } from "@/utils/notifications";
 209 import { ArrayFun } from "@/utils/array";
 210 import { ajax } from "@/utils/ajax";
 211 import params from "@/parameters";
 212 import { getRandString, shuffle, randInt } from "@/utils/alea";
 213 import { getDiagram } from "@/utils/printDiagram";
 214 import Chat from "@/components/Chat.vue";
 215 import GameList from "@/components/GameList.vue";
 216 import ChallengeList from "@/components/ChallengeList.vue";
 217 import { GameStorage } from "@/utils/gameStorage";
 218 import { processModalClick } from "@/utils/modalClick";
 219 export default {
 220   name: "my-hall",
 221   components: {
 222     Chat,
 223     GameList,
 224     ChallengeList
 225   },
 226   data: function() {
 227     return {
 228       st: store.state,
 229       cdisplay: "live", //or corr
 230       gdisplay: "live",
 231       // timestamp of last showed (oldest) corr game:
 232       cursor: Number.MAX_SAFE_INTEGER,
 233       // hasMore == TRUE: a priori there could be more games to load
 234       hasMore: true,
 235       games: [],
 236       challenges: [],
 237       people: {},
 238       infoMessage: "",
 239       newchallenge: {
 240         fen: "",
 241         vid: parseInt(localStorage.getItem("vid")) || 0,
 242         to: "", //name of challenged player (if any)
 243         cadence: localStorage.getItem("cadence") || "",
 244         randomness:
 245           // Warning: randomness can be 0, then !!randomness is false
 246           (parseInt(localStorage.getItem("challRandomness"))+1 || 3) - 1,
 247         // VariantRules object, stored to not interfere with
 248         // diagrams of targetted challenges:
 249         V: null,
 250         vname: "",
 251         diag: "", //visualizing FEN
 252         memorize: false //put settings in localStorage
 253       },
 254       focus: true,
 255       tchallDiag: "",
 256       curChallToAccept: {from: {}},
 257       presetChalls: JSON.parse(localStorage.getItem("presetChalls") || "[]"),
 258       conn: null,
 259       connexionString: "",
 260       socketCloseListener: 0,
 261       // Related to (killing of) self multi-connects:
 262       newConnect: {}
 263     };
 264   },
 265   watch: {
 266     // st.variants changes only once, at loading from [] to [...]
 267     "st.variants": function() {
 268       // Set potential challenges and games variant names:
 269       this.challenges.concat(this.games).forEach(o => {
 270         if (!o.vname) o.vname = this.getVname(o.vid);
 271       });
 272       if (!this.newchallenge.V && this.newchallenge.vid > 0)
 273         this.loadNewchallVariant();
 274     },
 275     $route: function(to, from) {
 276       if (to.path != "/") this.cleanBeforeDestroy();
 277     }
 278   },
 279   created: function() {
 280     document.addEventListener('visibilitychange', this.visibilityChange);
 281     window.addEventListener('focus', this.onFocus);
 282     window.addEventListener('blur', this.onBlur);
 283     window.addEventListener("beforeunload", this.cleanBeforeDestroy);
 284     if (this.st.variants.length > 0 && this.newchallenge.vid > 0)
 285       this.loadNewchallVariant();
 286     const my = this.st.user;
 287     const tmpId = getRandString();
 288     this.$set(
 289       this.people,
 290       my.sid,
 291       {
 292         id: my.id,
 293         name: my.name,
 294         tmpIds: {
 295           tmpId: { page: "/", focus: true }
 296         }
 297       }
 298     );
 299     const connectAndPoll = () => {
 300       this.send("connect");
 301       this.send("pollclientsandgamers");
 302     };
 303     // Initialize connection
 304     this.connexionString =
 305       params.socketUrl +
 306       "/?sid=" + this.st.user.sid +
 307       "&id=" + this.st.user.id +
 308       "&tmpId=" + tmpId +
 309       "&page=" +
 310       // Hall: path is "/" (TODO: could be hard-coded as well)
 311       encodeURIComponent(this.$route.path);
 312     this.conn = new WebSocket(this.connexionString);
 313     this.conn.onopen = connectAndPoll;
 314     this.conn.addEventListener("message", this.socketMessageListener);
 315     this.socketCloseListener = setInterval(
 316       () => {
 317         if (this.conn.readyState == 3) {
 318           this.conn.removeEventListener("message", this.socketMessageListener);
 319           this.conn = new WebSocket(this.connexionString);
 320           this.conn.addEventListener("message", this.socketMessageListener);
 321         }
 322       },
 323       1000
 324     );
 325   },
 326   mounted: function() {
 327     document.getElementById("peopleWrap")
 328       .addEventListener("click", (e) => {
 329         processModalClick(e, () => {
 330           this.toggleSocialColor("close")
 331         });
 332       });
 333     ["infoDiv", "newgameDiv"].forEach(eltName => {
 334       document.getElementById(eltName)
 335         .addEventListener("click", processModalClick);
 336     });
 337     document.querySelectorAll("#predefinedCadences > button").forEach(b => {
 338       b.addEventListener("click", () => {
 339         this.newchallenge.cadence = b.innerHTML;
 340       });
 341     });
 342     const dispCorr = this.$route.query["disp"];
 343     const showCtype =
 344       dispCorr || localStorage.getItem("type-challenges") || "live";
 345     const showGtype =
 346       dispCorr || localStorage.getItem("type-games") || "live";
 347     this.setDisplay('c', showCtype);
 348     this.setDisplay('g', showGtype);
 349     // Ask server for current corr games (all but mines)
 350     this.loadMoreCorr();
 351     // Also ask for corr challenges (open + sent by/to me)
 352     // List them all, because they are not supposed to be that many (TODO?)
 353     ajax(
 354       "/challenges",
 355       "GET",
 356       {
 357         data: { uid: this.st.user.id },
 358         success: (response) => {
 359           if (
 360             response.challenges.length > 0 &&
 361             this.challenges.length == 0 &&
 362             this.cdisplay == "live"
 363           ) {
 364             document
 365               .getElementById("btnCcorr")
 366               .classList.add("somethingnew");
 367           }
 368           // Gather all senders names, and then retrieve full identity:
 369           // (TODO [perf]: some might be online...)
 370           let names = {};
 371           response.challenges.forEach(c => {
 372             if (c.uid != this.st.user.id) names[c.uid] = "";
 373             else if (!!c.target && c.target != this.st.user.id)
 374               names[c.target] = "";
 375           });
 376           const addChallenges = () => {
 377             names[this.st.user.id] = this.st.user.name; //in case of
 378             this.challenges = this.challenges.concat(
 379               response.challenges.map(c => {
 380                 const from = { name: names[c.uid], id: c.uid }; //or just name
 381                 const type = this.classifyObject(c);
 382                 const vname = this.getVname(c.vid);
 383                 return Object.assign(
 384                   {},
 385                   {
 386                     type: type,
 387                     vname: vname,
 388                     from: from,
 389                     to: c.target ? names[c.target] : ""
 390                   },
 391                   c
 392                 );
 393               })
 394             );
 395           };
 396           if (Object.keys(names).length > 0) {
 397             ajax(
 398               "/users",
 399               "GET",
 400               {
 401                 data: { ids: Object.keys(names).join(",") },
 402                 success: (response2) => {
 403                   response2.users.forEach(u => {
 404                     names[u.id] = u.name;
 405                   });
 406                   addChallenges();
 407                 }
 408               }
 409             );
 410           } else addChallenges();
 411         }
 412       }
 413     );
 414   },
 415   beforeDestroy: function() {
 416     this.cleanBeforeDestroy();
 417   },
 418   methods: {
 419     cleanBeforeDestroy: function() {
 420       clearInterval(this.socketCloseListener);
 421       document.removeEventListener('visibilitychange', this.visibilityChange);
 422       window.removeEventListener('focus', this.onFocus);
 423       window.removeEventListener('blur', this.onBlur);
 424       window.removeEventListener("beforeunload", this.cleanBeforeDestroy);
 425       this.conn.removeEventListener("message", this.socketMessageListener);
 426       this.send("disconnect");
 427       this.conn = null;
 428     },
 429     getRandomnessClass: function(pc) {
 430       return {
 431         ["random-" + pc.randomness]: true
 432       };
 433     },
 434     anonymousCount: function() {
 435       let count = 0;
 436       Object.values(this.people).forEach(p => {
 437         // Do not cound people who did not send their identity yet:
 438         count += (!p.name && p.id === 0) ? 1 : 0;
 439       });
 440       return count;
 441     },
 442     visibilityChange: function() {
 443       // TODO: Use document.hidden? https://webplatform.news/issues/2019-03-27
 444       this.focus = (document.visibilityState == "visible");
 445       this.send(this.focus ? "getfocus" : "losefocus");
 446     },
 447     onFocus: function() {
 448       this.focus = true;
 449       this.send("getfocus");
 450     },
 451     onBlur: function() {
 452       this.focus = false;
 453       this.send("losefocus");
 454     },
 455     partialResetNewchallenge: function() {
 456       // Reset potential target and custom FEN:
 457       this.newchallenge.to = "";
 458       this.newchallenge.fen = "";
 459       this.newchallenge.diag = "";
 460       this.newchallenge.memorize = false;
 461     },
 462     showNewchallengeForm: function() {
 463       this.partialResetNewchallenge();
 464       window.doClick("modalNewgame");
 465     },
 466     addPresetChall: function(chall) {
 467       // Add only if not already existing:
 468       if (this.presetChalls.some(c =>
 469         c.vid == chall.vid &&
 470         c.cadence == chall.cadence &&
 471         c.randomness == chall.randomness
 472       )) {
 473         return;
 474       }
 475       const L = this.presetChalls.length;
 476       this.presetChalls.push({
 477         index: L,
 478         vid: chall.vid,
 479         vname: chall.vname, //redundant, but easier
 480         cadence: chall.cadence,
 481         randomness: chall.randomness
 482       });
 483       localStorage.setItem("presetChalls", JSON.stringify(this.presetChalls));
 484     },
 485     removePresetChall: function(e, pchall) {
 486       e.stopPropagation();
 487       const pchallIdx =
 488         this.presetChalls.findIndex(pc => pc.index == pchall.index);
 489       this.presetChalls.splice(pchallIdx, 1);
 490       localStorage.setItem("presetChalls", JSON.stringify(this.presetChalls));
 491     },
 492     tchallButtonsMargin: function() {
 493       if (!!this.curChallToAccept.fen) return { "margin-top": "10px" };
 494       return {};
 495     },
 496     changeChallTarget: function() {
 497       if (!this.newchallenge.to) {
 498         // Reset potential FEN + diagram
 499         this.newchallenge.fen = "";
 500         this.newchallenge.diag = "";
 501       }
 502     },
 503     cadenceFocusIfOpened: function() {
 504       if (event.target.checked)
 505         document.getElementById("cadence").focus();
 506     },
 507     send: function(code, obj) {
 508       if (!!this.conn && this.conn.readyState == 1) {
 509         this.conn.send(JSON.stringify(Object.assign({ code: code }, obj)));
 510       }
 511     },
 512     getVname: function(vid) {
 513       const variant = this.st.variants.find(v => v.id == vid);
 514       // this.st.variants might be uninitialized (variant == null)
 515       return variant ? variant.name : "";
 516     },
 517     filterChallenges: function(type) {
 518       return this.challenges.filter(c => c.type == type);
 519     },
 520     filterGames: function(type) {
 521       return this.games.filter(g => g.type == type);
 522     },
 523     // o: challenge or game
 524     classifyObject: function(o) {
 525       // Consider imports as live games (TODO)
 526       if (!!o.id && !!o.id.toString().match(/^i/)) return "live";
 527       return o.cadence.indexOf("d") === -1 ? "live" : "corr";
 528     },
 529     setDisplay: function(letter, type, e) {
 530       this[letter + "display"] = type;
 531       localStorage.setItem(
 532         "type-" + (letter == "c" ? "challenges" : "games"),
 533         type
 534       );
 535       let elt = e
 536         ? e.target
 537         : document.getElementById("btn" + letter.toUpperCase() + type);
 538       elt.classList.add("active");
 539       elt.classList.remove("somethingnew"); //in case of
 540       if (!!elt.previousElementSibling)
 541         elt.previousElementSibling.classList.remove("active");
 542       else elt.nextElementSibling.classList.remove("active");
 543     },
 544     isGamer: function(sid) {
 545       return Object.values(this.people[sid].tmpIds)
 546         .some(v => v.focus && v.page.indexOf("/game/") >= 0);
 547     },
 548     isFocusedOnHall: function(sid) {
 549       return (
 550         // This is meant to challenge people, thus the next 2 conditions:
 551         this.st.user.id > 0 &&
 552         sid != this.st.user.sid &&
 553         Object.values(this.people[sid].tmpIds)
 554           .some(v => v.focus && v.page == "/")
 555       );
 556     },
 557     challenge: function(sid) {
 558       this.partialResetNewchallenge();
 559       // Available, in Hall
 560       this.newchallenge.to = this.people[sid].name;
 561       // TODO: also store target sid to not re-search for it
 562       document.getElementById("modalPeople").checked = false;
 563       window.doClick("modalNewgame");
 564     },
 565     watchGame: function(sid) {
 566       // In some game, maybe playing maybe not: show a random one
 567       let gids = [];
 568       Object.values(this.people[sid].tmpIds).forEach(v => {
 569         if (v.focus) {
 570           const matchGid = v.page.match(/[a-zA-Z0-9]+$/);
 571           if (!!matchGid) gids.push(matchGid[0]);
 572         }
 573       });
 574       const gid = gids[Math.floor(Math.random() * gids.length)];
 575       window.open("/#/game/" + gid, "_blank");
 576     },
 577     showGame: function(g) {
 578       // NOTE: we are an observer, since only games I don't play are shown here
 579       // ==> Moves sent by connected remote player(s) if live game
 580       window.open("/#/game/" + g.id, "_blank");
 581     },
 582     toggleSocialColor: function(action) {
 583       if (!action && document.getElementById("modalPeople").checked)
 584         document.getElementById("inputChat").focus();
 585       else
 586         document.getElementById("peopleBtn").classList.remove("somethingnew");
 587     },
 588     processChat: function(chat) {
 589       this.send("newchat", { data: chat });
 590     },
 591     getOppsid: function(c) {
 592       let oppsid = c.from.sid; //may not be defined if corr + offline opp
 593       if (!oppsid) {
 594         oppsid = Object.keys(this.people).find(
 595           sid => this.people[sid].id == c.from.id
 596         );
 597       }
 598       return oppsid;
 599     },
 600     // Messaging center:
 601     socketMessageListener: function(msg) {
 602       if (!this.conn) return;
 603       const data = JSON.parse(msg.data);
 604       switch (data.code) {
 605         case "pollclientsandgamers": {
 606           // TODO: shuffling and random filtering on server,
 607           // if the room is really crowded.
 608           Object.keys(data.sockIds).forEach(sid => {
 609             if (sid != this.st.user.sid) {
 610               // Pick a target tmpId (+page) at random:
 611               const pt = Object.values(data.sockIds[sid]);
 612               const randPage = pt[randInt(pt.length)].page;
 613               this.send(
 614                 "askidentity",
 615                 {
 616                   target: sid,
 617                   page: randPage
 618                 }
 619               );
 620             }
 621             if (!this.people[sid])
 622               // Do not set name or id: identity unknown yet
 623               this.people[sid] = { tmpIds: data.sockIds[sid] };
 624             else
 625               Object.assign(this.people[sid].tmpIds, data.sockIds[sid]);
 626             if (Object.values(data.sockIds[sid]).some(v => v.page == "/"))
 627               // Peer is in Hall
 628               this.send("askchallenges", { target: sid });
 629             Object.values(data.sockIds[sid]).forEach(v => {
 630               if (
 631                 v.page.indexOf("/game/") >= 0 &&
 632                 !v.page.match(/\/[0-9]+$/)
 633               ) {
 634                 // Peer is in Game: ask only if live game
 635                 this.send("askgame", { target: sid, page: v.page });
 636               }
 637             });
 638           });
 639           break;
 640         }
 641         case "connect":
 642         case "gconnect": {
 643           const page = data.page || "/";
 644           if (data.code == "connect") {
 645             // Ask challenges only on first connexion:
 646             if (!this.people[data.from[0]])
 647               this.send("askchallenges", { target: data.from[0] });
 648           }
 649           // Ask game only if live:
 650           else if (!page.match(/\/[0-9]+$/))
 651             this.send("askgame", { target: data.from[0], page: page });
 652           if (!this.people[data.from[0]]) {
 653             this.$set(
 654               this.people,
 655               data.from[0],
 656               {
 657                 tmpIds: {
 658                   [data.from[1]]: { page: page, focus: true }
 659                 }
 660               }
 661             );
 662             // For self multi-connects tests:
 663             this.newConnect[data.from[0]] = true;
 664             this.send("askidentity", { target: data.from[0], page: page });
 665           } else {
 666             this.people[data.from[0]].tmpIds[data.from[1]] =
 667               { page: page, focus: true };
 668             this.$forceUpdate(); //TODO: shouldn't be required
 669           }
 670           break;
 671         }
 672         case "disconnect":
 673         case "gdisconnect": {
 674           // If the user reloads the page twice very quickly
 675           // (experienced with Firefox), the first reload won't have time to
 676           // connect but will trigger a "close" event anyway.
 677           // ==> Next check is required.
 678           if (!this.people[data.from[0]]) return;
 679           delete this.people[data.from[0]].tmpIds[data.from[1]];
 680           if (Object.keys(this.people[data.from[0]].tmpIds).length == 0)
 681             this.$delete(this.people, data.from[0]);
 682           else this.$forceUpdate(); //TODO: shouldn't be required
 683           if (data.code == "disconnect") {
 684             // Remove the live challenges sent by this player, if
 685             // he isn't connected on another tab:
 686             if (
 687               !this.people[data.from[0]] ||
 688               Object.values(this.people[data.from[0]].tmpIds)
 689                 .every(v => v.page != "/")
 690             ) {
 691               ArrayFun.remove(
 692                 this.challenges,
 693                 c => c.type == "live" && c.from.sid == data.from[0],
 694                 "all"
 695               );
 696             }
 697           } else {
 698             // Remove the matching live game if now unreachable
 699             const gid = data.page.match(/[a-zA-Z0-9]+$/)[0];
 700             // Corr games are always reachable:
 701             if (!gid.match(/^[0-9]+$/)) {
 702               // Live games are reachable if someone is on the game page
 703               if (Object.values(this.people).every(p =>
 704                 Object.values(p.tmpIds).every(v => v.page != data.page))
 705               ) {
 706                 ArrayFun.remove(this.games, g => g.id == gid);
 707               }
 708             }
 709           }
 710           break;
 711         }
 712         case "getfocus": {
 713           let player = this.people[data.from[0]];
 714           // If user reload a page, focus may arrive earlier than connect
 715           if (!!player) {
 716             player.tmpIds[data.from[1]].focus = true;
 717             this.$forceUpdate(); //TODO: shouldn't be required
 718           }
 719           break;
 720         }
 721         case "losefocus": {
 722           let player = this.people[data.from[0]];
 723           if (!!player) {
 724             player.tmpIds[data.from[1]].focus = false;
 725             this.$forceUpdate(); //TODO: shouldn't be required
 726           }
 727           break;
 728         }
 729         case "askidentity": {
 730           // Request for identification
 731           const me = {
 732             // Decompose to avoid revealing email
 733             name: this.st.user.name,
 734             sid: this.st.user.sid,
 735             id: this.st.user.id
 736           };
 737           this.send("identity", { data: me, target: data.from });
 738           break;
 739         }
 740         case "identity": {
 741           const user = data.data;
 742           let player = this.people[user.sid];
 743           // player.tmpIds is already set
 744           player.id = user.id;
 745           player.name = user.name;
 746           // TODO: this.$set(people, ...) fails. So forceUpdate.
 747           //       But this shouldn't be like that!
 748           this.$forceUpdate();
 749           // If I multi-connect, kill current connexion if no mark (I'm older)
 750           if (this.newConnect[user.sid]) {
 751             delete this.newConnect[user.sid];
 752             if (
 753               user.id > 0 &&
 754               user.id == this.st.user.id &&
 755               user.sid != this.st.user.sid
 756             ) {
 757               // I logged in elsewhere:
 758               this.cleanBeforeDestroy();
 759               alert(this.st.tr["New connexion detected: tab now offline"]);
 760             }
 761           }
 762           break;
 763         }
 764         case "askchallenges": {
 765           // Send my current live challenges (if any)
 766           const myChallenges = this.challenges
 767             .filter(c =>
 768               c.from.sid == this.st.user.sid && c.type == "live"
 769             )
 770             .map(c => {
 771               // NOTE: in principle, should only send targeted challenge to the
 772               // target. But we may not know yet the identity of the target
 773               // (just name), so can't decide if data.from is the target.
 774               return {
 775                 id: c.id,
 776                 from: this.st.user.sid,
 777                 to: c.to,
 778                 randomness: c.randomness,
 779                 fen: c.fen,
 780                 vid: c.vid,
 781                 cadence: c.cadence,
 782                 added: c.added
 783               };
 784             });
 785           if (myChallenges.length > 0)
 786             this.send("challenges", { data: myChallenges, target: data.from });
 787           break;
 788         }
 789         case "challenges": //after "askchallenges"
 790           data.data.forEach(this.addChallenge);
 791           break;
 792         case "newchallenge":
 793           this.addChallenge(data.data);
 794           break;
 795         case "refusechallenge": {
 796           const cid = data.data;
 797           ArrayFun.remove(this.challenges, c => c.id == cid);
 798           alert(this.st.tr["Challenge declined"]);
 799           break;
 800         }
 801         case "deletechallenge_s": {
 802           // NOTE: the challenge(s) may be already removed
 803           const cref = data.data;
 804           if (!!cref.cid)
 805             ArrayFun.remove(this.challenges, c => c.id == cref.cid);
 806           else if (!!cref.sids) {
 807             cref.sids.forEach(s => {
 808               ArrayFun.remove(
 809                 this.challenges,
 810                 c => c.type == "live" && c.from.sid == s,
 811                 "all"
 812               );
 813             });
 814           }
 815           break;
 816         }
 817         case "game": // Individual request
 818         case "newgame": {
 819           const game = data.data;
 820           // Ignore games where I play (will go in MyGames page),
 821           // and also games that I already received.
 822           if (
 823             this.games.findIndex(g => g.id == game.id) == -1 &&
 824             game.players.every(p => {
 825               return (
 826                 p.sid != this.st.user.sid &&
 827                 (p.id == 0 || p.id != this.st.user.id)
 828               );
 829             })
 830           ) {
 831             let newGame = game;
 832             newGame.type = this.classifyObject(game);
 833             newGame.vname = this.getVname(game.vid);
 834             if (!game.score)
 835               // New game from Hall
 836               newGame.score = "*";
 837             this.games.push(newGame);
 838             if (
 839               newGame.score == '*' &&
 840               (newGame.type == "live" && this.gdisplay == "corr") ||
 841               (newGame.type == "corr" && this.gdisplay == "live")
 842             ) {
 843               document
 844                 .getElementById("btnG" + newGame.type)
 845                 .classList.add("somethingnew");
 846             }
 847           }
 848           break;
 849         }
 850         case "result": {
 851           let g = this.games.find(g => g.id == data.gid);
 852           if (!!g) g.score = data.score;
 853           break;
 854         }
 855         case "startgame": {
 856           // New game just started, I'm involved
 857           const gameInfo = data.data;
 858           if (this.classifyObject(gameInfo) == "live")
 859             this.startNewGame(gameInfo);
 860           else {
 861             this.infoMessage =
 862               this.st.tr["New correspondance game:"] + " " +
 863               "<a href='#/game/" + gameInfo.id + "'>" +
 864               "#/game/" + gameInfo.id + "</a>";
 865             document.getElementById("modalInfo").checked = true;
 866           }
 867           break;
 868         }
 869         case "newchat":
 870           this.$refs["chatcomp"].newChat(data.data);
 871           if (!document.getElementById("modalPeople").checked)
 872             document.getElementById("peopleBtn").classList.add("somethingnew");
 873           break;
 874       }
 875     },
 876     loadMoreCorr: function() {
 877       ajax(
 878         "/observedgames",
 879         "GET",
 880         {
 881           data: {
 882             uid: this.st.user.id,
 883             cursor: this.cursor
 884           },
 885           success: (res) => {
 886             const L = res.games.length;
 887             if (L > 0) {
 888               if (
 889                 this.cursor == Number.MAX_SAFE_INTEGER &&
 890                 this.games.length == 0 &&
 891                 this.gdisplay == "live" &&
 892                 res.games.some(g => g.score == '*')
 893               ) {
 894                 // First loading: show indicators
 895                 document
 896                   .getElementById("btnGcorr")
 897                   .classList.add("somethingnew");
 898               }
 899               this.cursor = res.games[L - 1].created;
 900               let moreGames = res.games.map(g => {
 901                 const vname = this.getVname(g.vid);
 902                 return Object.assign(
 903                   {},
 904                   g,
 905                   {
 906                     type: "corr",
 907                     vname: vname
 908                   }
 909                 );
 910               });
 911               this.games = this.games.concat(moreGames);
 912             } else this.hasMore = false;
 913           }
 914         }
 915       );
 916     },
 917     // Challenge lifecycle:
 918     addChallenge: function(chall) {
 919       // NOTE about next condition: see "askchallenges" case.
 920       if (
 921         !chall.to ||
 922         (this.people[chall.from].id > 0 &&
 923           (chall.from == this.st.user.sid || chall.to == this.st.user.name))
 924       ) {
 925         let newChall = Object.assign({}, chall);
 926         newChall.type = this.classifyObject(chall);
 927         newChall.randomness = chall.randomness;
 928         newChall.added = Date.now();
 929         let fromValues = Object.assign({}, this.people[chall.from]);
 930         delete fromValues["pages"]; //irrelevant in this context
 931         newChall.from = Object.assign({ sid: chall.from }, fromValues);
 932         newChall.vname = this.getVname(newChall.vid);
 933         this.challenges.push(newChall);
 934         if (
 935           (newChall.type == "live" && this.cdisplay == "corr") ||
 936           (newChall.type == "corr" && this.cdisplay == "live")
 937         ) {
 938           document
 939             .getElementById("btnC" + newChall.type)
 940             .classList.add("somethingnew");
 941         }
 942         if (!!chall.to) {
 943           notify(
 944             "New challenge",
 945             // fromValues.name should exist since the player is online, but
 946             // let's consider there is some chance that the challenge arrives
 947             // right after we connected and before receiving the poll result:
 948             { body: "from " + (fromValues.name || "unknown yet...") }
 949           );
 950         }
 951       }
 952     },
 953     loadNewchallVariant: async function(cb) {
 954       const vname = this.getVname(this.newchallenge.vid);
 955       await import("@/variants/" + vname + ".js")
 956       .then((vModule) => {
 957         window.V = vModule[vname + "Rules"];
 958         this.newchallenge.V = window.V;
 959         this.newchallenge.vname = vname;
 960         if (!!cb) cb();
 961       });
 962     },
 963     trySetNewchallDiag: function() {
 964       if (!this.newchallenge.fen) {
 965         this.newchallenge.diag = "";
 966         return;
 967       }
 968       // If vid > 0 then the variant is loaded (function above):
 969       window.V = this.newchallenge.V;
 970       if (
 971         this.newchallenge.vid > 0 &&
 972         !!this.newchallenge.fen &&
 973         V.IsGoodFen(this.newchallenge.fen)
 974       ) {
 975         const parsedFen = V.ParseFen(this.newchallenge.fen);
 976         this.newchallenge.diag = getDiagram({
 977           position: parsedFen.position,
 978           orientation: parsedFen.turn
 979         });
 980       } else this.newchallenge.diag = "";
 981     },
 982     newChallFromPreset(pchall) {
 983       this.partialResetNewchallenge();
 984       this.newchallenge.vid = pchall.vid;
 985       this.newchallenge.cadence = pchall.cadence;
 986       this.newchallenge.randomness = pchall.randomness;
 987       this.loadNewchallVariant(this.issueNewChallenge);
 988     },
 989     issueNewChallenge: async function() {
 990       if (!!(this.newchallenge.cadence.match(/^[0-9]+$/)))
 991         this.newchallenge.cadence += "+0"; //assume minutes, no increment
 992       const ctype = this.classifyObject(this.newchallenge);
 993       // TODO: cadence still unchecked so ctype could be wrong...
 994       let error = "";
 995       if (!this.newchallenge.vid)
 996         error = this.st.tr["Please select a variant"];
 997       else if (ctype == "corr" && this.st.user.id <= 0)
 998         error = this.st.tr["Please log in to play correspondance games"];
 999       else if (!!this.newchallenge.to) {
1000         if (this.newchallenge.to == this.st.user.name)
1001           error = this.st.tr["Self-challenge is forbidden"];
1002         else if (
1003           ctype == "live" &&
1004           Object.values(this.people).every(p => p.name != this.newchallenge.to)
1005         ) {
1006           error = this.newchallenge.to + " " + this.st.tr["is not online"];
1007         }
1008       }
1009       if (error) {
1010         alert(error);
1011         return;
1012       }
1013       window.V = this.newchallenge.V;
1014       error = checkChallenge(this.newchallenge);
1015       if (error) {
1016         alert(error);
1017         return;
1018       }
1019       // NOTE: "from" information is not required here
1020       let chall = Object.assign({}, this.newchallenge);
1021       // Add only if not already issued (not counting target or FEN):
1022       if (this.challenges.some(c =>
1023         (
1024           c.from.sid == this.st.user.sid ||
1025           (c.from.id > 0 && c.from.id == this.st.user.id)
1026         )
1027         &&
1028         c.vid == chall.vid &&
1029         c.cadence == chall.cadence &&
1030         c.randomness == chall.randomness
1031       )) {
1032         alert(this.st.tr["Challenge already exists"]);
1033         return;
1034       }
1035       if (this.newchallenge.memorize) this.addPresetChall(this.newchallenge);
1036       delete chall["V"];
1037       delete chall["diag"];
1038       const finishAddChallenge = cid => {
1039         chall.id = cid || "c" + getRandString();
1040         const MAX_ALLOWED_CHALLS = 3;
1041         // Remove oldest challenge if 3 found: only 3 at a time of a given type
1042         let countMyChalls = 0;
1043         let challToDelIdx = 0;
1044         let oldestAdded = Number.MAX_SAFE_INTEGER;
1045         for (let i=0; i<this.challenges.length; i++) {
1046           const c = this.challenges[i];
1047           if (
1048             c.type == ctype &&
1049             (
1050               c.from.sid == this.st.user.sid ||
1051               (c.from.id > 0 && c.from.id == this.st.user.id)
1052             )
1053           ) {
1054             countMyChalls++;
1055             if (c.added < oldestAdded) {
1056               challToDelIdx = i;
1057               oldestAdded = c.added;
1058             }
1059           }
1060         }
1061         if (countMyChalls >= MAX_ALLOWED_CHALLS) {
1062           this.send(
1063             "deletechallenge_s",
1064             { data: { cid: this.challenges[challToDelIdx].id } }
1065           );
1066           if (ctype == "corr") {
1067             ajax(
1068               "/challenges",
1069               "DELETE",
1070               { data: { id: this.challenges[challToDelIdx].id } }
1071             );
1072           }
1073           this.challenges.splice(challToDelIdx, 1);
1074         }
1075         this.send("newchallenge", {
1076           data: Object.assign({ from: this.st.user.sid }, chall)
1077         });
1078         // Add new challenge:
1079         chall.from = {
1080           sid: this.st.user.sid,
1081           id: this.st.user.id,
1082           name: this.st.user.name
1083         };
1084         chall.added = Date.now();
1085         // NOTE: vname and type are redundant (deduced from cadence + vid)
1086         chall.type = ctype;
1087         chall.vname = this.newchallenge.vname;
1088         this.challenges.push(chall);
1089         // Remember cadence  + vid for quicker further challenges:
1090         localStorage.setItem("cadence", chall.cadence);
1091         localStorage.setItem("vid", chall.vid);
1092         localStorage.setItem("challRandomness", chall.randomness);
1093         document.getElementById("modalNewgame").checked = false;
1094         // Show the challenge if not on current display
1095         if (
1096           (ctype == "live" && this.cdisplay == "corr") ||
1097           (ctype == "corr" && this.cdisplay == "live")
1098         ) {
1099           this.setDisplay('c', ctype);
1100         }
1101       };
1102       if (ctype == "live") {
1103         // Live challenges have a random ID
1104         finishAddChallenge(null);
1105       } else {
1106         // Correspondance game: send challenge to server
1107         ajax(
1108           "/challenges",
1109           "POST",
1110           {
1111             data: { chall: chall },
1112             success: (response) => {
1113               finishAddChallenge(response.id);
1114             }
1115           }
1116         );
1117       }
1118     },
1119     // Callback function after a diagram was showed to accept
1120     // or refuse targetted challenge:
1121     decisionChallenge: function(accepted) {
1122       this.curChallToAccept.accepted = accepted;
1123       this.finishProcessingChallenge(this.curChallToAccept);
1124       document.getElementById("modalAccept").checked = false;
1125     },
1126     finishProcessingChallenge: function(c) {
1127       if (c.accepted) {
1128         c.seat = {
1129           sid: this.st.user.sid,
1130           id: this.st.user.id,
1131           name: this.st.user.name
1132         };
1133         this.launchGame(c);
1134         if (c.type == "live") {
1135           // Remove all live challenges of both players
1136           this.send(
1137             "deletechallenge_s",
1138             { data: { sids: [c.from.sid, c.seat.sid] } }
1139           );
1140         }
1141         else
1142           // Corr challenge: just remove the challenge
1143           this.send("deletechallenge_s", { data: { cid: c.id } });
1144       } else {
1145         const oppsid = this.getOppsid(c);
1146         if (!!oppsid)
1147           this.send("refusechallenge", { data: c.id, target: oppsid });
1148         if (c.type == "corr") {
1149           ajax(
1150             "/challenges",
1151             "DELETE",
1152             { data: { id: c.id } }
1153           );
1154         }
1155         this.send("deletechallenge_s", { data: { cid: c.id } });
1156       }
1157     },
1158     // TODO: if several players click same challenge at the same time: problem
1159     clickChallenge: async function(c) {
1160       const myChallenge =
1161         c.from.sid == this.st.user.sid || //live
1162         (this.st.user.id > 0 && c.from.id == this.st.user.id); //corr
1163       if (!myChallenge) {
1164         if (c.type == "corr" && this.st.user.id <= 0) {
1165           alert(this.st.tr["Please log in to accept corr challenges"]);
1166           return;
1167         }
1168         c.accepted = true;
1169         await import("@/variants/" + c.vname + ".js")
1170         .then((vModule) => {
1171           window.V = vModule[c.vname + "Rules"];
1172           if (!!c.to) {
1173             // c.to == this.st.user.name (connected)
1174             if (!!c.fen) {
1175               const parsedFen = V.ParseFen(c.fen);
1176               c.mycolor = V.GetOppCol(parsedFen.turn);
1177               this.tchallDiag = getDiagram({
1178                 position: parsedFen.position,
1179                 orientation: c.mycolor
1180               });
1181             }
1182             this.curChallToAccept = c;
1183             document.getElementById("modalAccept").checked = true;
1184           }
1185           else this.finishProcessingChallenge(c);
1186         });
1187       }
1188       else {
1189         // My challenge
1190         if (c.type == "corr") {
1191           ajax(
1192             "/challenges",
1193             "DELETE",
1194             { data: { id: c.id } }
1195           );
1196         }
1197         this.send("deletechallenge_s", { data: { cid: c.id } });
1198       }
1199       // In all cases, the challenge is consumed:
1200       ArrayFun.remove(this.challenges, ch => ch.id == c.id);
1201     },
1202     // NOTE: when launching game, the challenge is already being deleted
1203     launchGame: function(c) {
1204       // White player index 0, black player index 1:
1205       let players =
1206         !!c.mycolor
1207           ? (c.mycolor == "w" ? [c.seat, c.from] : [c.from, c.seat])
1208           : shuffle([c.from, c.seat]);
1209       players.forEach(p => {
1210         if (!!p["tmpIds"]) delete p["tmpIds"];
1211       });
1212       // These game informations will be shared
1213       let gameInfo = {
1214         id: getRandString(),
1215         fen: c.fen || V.GenRandInitFen(c.randomness),
1216         randomness: c.randomness, //for rematch
1217         players: players,
1218         vid: c.vid,
1219         cadence: c.cadence
1220       };
1221       const notifyNewgame = () => {
1222         const oppsid = this.getOppsid(c);
1223         if (!!oppsid)
1224           // Opponent is online
1225           this.send("startgame", { data: gameInfo, target: oppsid });
1226         // If new corr game, notify Hall (except opponent and me)
1227         if (c.type == "corr") {
1228           this.send(
1229             "newgame",
1230             {
1231               data: gameInfo,
1232               excluded: [this.st.user.sid, oppsid]
1233             }
1234           );
1235         }
1236         // Notify MyGames page:
1237         this.send(
1238           "notifynewgame",
1239           {
1240             data: gameInfo,
1241             targets: gameInfo.players
1242           }
1243         );
1244         // NOTE: no need to send the game to the room, since I'll connect
1245         // on game just after, the main Hall will be notified.
1246       };
1247       if (c.type == "live") {
1248         notifyNewgame();
1249         this.startNewGame(gameInfo);
1250       } else {
1251         // corr: game only on server
1252         ajax(
1253           "/games",
1254           "POST",
1255           {
1256             // cid is useful to delete the challenge:
1257             data: {
1258               gameInfo: gameInfo,
1259               cid: c.id
1260             },
1261             success: (response) => {
1262               gameInfo.id = response.id;
1263               notifyNewgame();
1264               this.$router.push("/game/" + response.id);
1265             }
1266           }
1267         );
1268       }
1269     },
1270     // NOTE: for live games only (corr games start on the server)
1271     startNewGame: function(gameInfo) {
1272       const game = Object.assign(
1273         {},
1274         gameInfo,
1275         {
1276           // (other) Game infos: constant
1277           fenStart: gameInfo.fen,
1278           vname: this.getVname(gameInfo.vid),
1279           created: Date.now(),
1280           // Game state (including FEN): will be updated
1281           moves: [],
1282           clocks: [-1, -1], //-1 = unstarted
1283           chats: [],
1284           score: "*"
1285         }
1286       );
1287       setTimeout(
1288         () => {
1289           const myIdx = (game.players[0].sid == this.st.user.sid ? 0 : 1);
1290           GameStorage.add(game, (err) => {
1291             // If an error occurred, game is not added: a tab already
1292             // added the game. Maybe a focused one, maybe not.
1293             // We know for sure that it emitted the gong start sound.
1294             // ==> Do not play it again.
1295             if (!err && this.st.settings.sound)
1296               new Audio("/sounds/newgame.flac").play().catch(() => {});
1297             if (!this.focus) {
1298               notify(
1299                 "New live game",
1300                 { body: "vs " + game.players[1-myIdx].name || "@nonymous" }
1301               );
1302             }
1303             this.$router.push(
1304               "/game/" + gameInfo.id + "/?focus=" + this.focus);
1305           });
1306         },
1307         this.focus ? 500 + 1000 * Math.random() : 0
1308       );
1309     }
1310   }
1311 };
1312 </script>
1313
1314 <style lang="sass" scoped>
1315 .active
1316   color: #388e3c
1317
1318 #infoDiv > .card
1319   padding: 15px 0
1320   max-width: 430px
1321
1322 #newgameDiv > .card, #acceptDiv > .card
1323   max-width: 767px
1324   max-height: 100%
1325
1326 div#peopleWrap > .card
1327   max-height: 100%
1328
1329 @media screen and (min-width: 1281px)
1330   div#peopleWrap > .card
1331     max-width: 66.67%
1332
1333 @media screen and (max-width: 1280px)
1334   div#peopleWrap > .card
1335     max-width: 83.33%
1336
1337 @media screen and (max-width: 767px)
1338   div#peopleWrap > .card
1339     max-width: 100%
1340
1341 #players
1342   width: 50%
1343   position: relative
1344   float: left
1345
1346 #chat
1347   width: 50%
1348   float: left
1349   position: relative
1350
1351 @media screen and (max-width: 767px)
1352   #players, #chats
1353     width: 100%
1354
1355 #chat > .card
1356   max-width: 100%
1357   margin: 0;
1358   border: none;
1359
1360 #players > p
1361   margin-left: 5px
1362
1363 .anonymous
1364   font-style: italic
1365
1366 button.player-action
1367   margin-left: 32px
1368
1369 .somethingnew
1370   background-color: #D6EAF8 !important
1371
1372 .tabbtn
1373   background-color: #f9faee
1374
1375 button.acceptBtn
1376   background-color: lightgreen
1377 button.refuseBtn
1378   background-color: red
1379
1380 #buttonsTchall
1381   // margin-top set dynamically (depends if diagram showed or not)
1382   & > button > span
1383     width: 100%
1384     text-align: center
1385
1386 .variantName
1387   font-weight: bold
1388
1389 .diagram
1390   margin: 0 auto
1391   max-width: 400px
1392   // width: 100% required for Firefox
1393   width: 100%
1394
1395 #inputFen
1396   width: 100%
1397
1398 #div2, #div3
1399   margin-top: 15px
1400 @media screen and (max-width: 767px)
1401   #div2, #div3
1402     margin-top: 0
1403
1404 tr > td
1405   &.random-0
1406     background-color: #FF5733
1407   &.random-1
1408     background-color: #2B63B4
1409   &.random-2
1410     background-color: #33B42B
1411
1412 @media screen and (max-width: 767px)
1413   h4
1414     margin: 5px 0
1415
1416 button#loadMoreBtn
1417   display: block
1418   margin: 0 auto
1419
1420 td.remove-preset
1421   background-color: lightgrey
1422   text-align: center
1423   & > img
1424     height: 1em
1425 </style>