git.cworth.org Git - lmno.games/blob - empathy/empathy.jsx

   1 const MAX_PROMPT_ITEMS = 20;
   2
   3 function undisplay(element) {
   4   element.style.display="none";
   5 }
   6
   7 function add_message(severity, message) {
   8   message = `<div class="message ${severity}" onclick="undisplay(this)">
   9 <span class="hide-button" onclick="undisplay(this.parentElement)">&times;</span>
  10 ${message}
  11 </div>`;
  12   const message_area = document.getElementById('message-area');
  13   message_area.insertAdjacentHTML('beforeend', message);
  14 }
  15
  16 /*********************************************************
  17  * Handling server-sent event stream                     *
  18  *********************************************************/
  19
  20 const events = new EventSource("events");
  21
  22 events.onerror = function(event) {
  23   if (event.target.readyState === EventSource.CLOSED) {
  24     setTimeout(() => {
  25       add_message("danger", "Connection to server lost.");
  26     }, 1000);
  27   }
  28 };
  29
  30 events.addEventListener("game-info", event => {
  31   const info = JSON.parse(event.data);
  32
  33   window.game.set_game_info(info);
  34 });
  35
  36 events.addEventListener("player-info", event => {
  37   const info = JSON.parse(event.data);
  38
  39   window.game.set_player_info(info);
  40 });
  41
  42 events.addEventListener("player-enter", event => {
  43   const info = JSON.parse(event.data);
  44
  45   window.game.set_other_player_info(info);
  46 });
  47
  48 events.addEventListener("player-update", event => {
  49   const info = JSON.parse(event.data);
  50
  51   if (info.id === window.game.state.player_info.id)
  52     window.game.set_player_info(info);
  53   else
  54     window.game.set_other_player_info(info);
  55 });
  56
  57 events.addEventListener("game-state", event => {
  58   const state = JSON.parse(event.data);
  59
  60   window.game.reset_game_state();
  61
  62   window.game.set_prompts(state.prompts);
  63
  64   window.game.set_active_prompt(state.active_prompt);
  65
  66   window.game.set_scores(state.scores);
  67
  68   window.game.set_ambiguities(state.ambiguities);
  69 });
  70
  71 events.addEventListener("prompt", event => {
  72   const prompt = JSON.parse(event.data);
  73
  74   window.game.add_or_update_prompt(prompt);
  75 });
  76
  77 events.addEventListener("start", event => {
  78   const prompt = JSON.parse(event.data);
  79
  80   window.game.set_active_prompt(prompt);
  81 });
  82
  83 events.addEventListener("player-answered", event => {
  84   const player = JSON.parse(event.data);
  85
  86   window.game.set_player_answered(player);
  87 });
  88
  89 events.addEventListener("player-answering", event => {
  90   const player = JSON.parse(event.data);
  91
  92   window.game.set_player_answering(player);
  93 });
  94
  95 events.addEventListener("vote-end-answers", event => {
  96   const player = JSON.parse(event.data);
  97
  98   window.game.set_player_vote_end_answers(player);
  99 });
 100
 101 events.addEventListener("unvote-end-answers", event => {
 102   const player = JSON.parse(event.data);
 103
 104   window.game.set_player_unvote_end_answers(player);
 105 });
 106
 107 events.addEventListener("ambiguities", event => {
 108   const ambiguities = JSON.parse(event.data);
 109
 110   window.game.set_ambiguities(ambiguities);
 111 });
 112
 113 events.addEventListener("player-judged", event => {
 114   const player = JSON.parse(event.data);
 115
 116   window.game.set_player_judged(player);
 117 });
 118
 119 events.addEventListener("player-judging", event => {
 120   const player = JSON.parse(event.data);
 121
 122   window.game.set_player_judging(player);
 123 });
 124
 125 events.addEventListener("vote-end-judging", event => {
 126   const player = JSON.parse(event.data);
 127
 128   window.game.set_player_vote_end_judging(player);
 129 });
 130
 131 events.addEventListener("unvote-end-judging", event => {
 132   const player = JSON.parse(event.data);
 133
 134   window.game.set_player_unvote_end_judging(player);
 135 });
 136
 137 events.addEventListener("scores", event => {
 138   const scores = JSON.parse(event.data);
 139
 140   window.game.set_scores(scores);
 141 });
 142
 143 /*********************************************************
 144  * Game and supporting classes                           *
 145  *********************************************************/
 146
 147 function copy_to_clipboard(id)
 148 {
 149   const tmp = document.createElement("input");
 150   tmp.setAttribute("value", document.getElementById(id).innerHTML);
 151   document.body.appendChild(tmp);
 152   tmp.select();
 153   document.execCommand("copy");
 154   document.body.removeChild(tmp);
 155 }
 156
 157 const GameInfo = React.memo(props => {
 158   if (! props.id)
 159     return null;
 160
 161   return (
 162     <div className="game-info">
 163       <span className="game-id">{props.id}</span>
 164       {" "}
 165       Share this link to invite friends:{" "}
 166       <span id="game-share-url">{props.url}</span>
 167       {" "}
 168       <button
 169         className="inline"
 170         onClick={() => copy_to_clipboard('game-share-url')}
 171       >Copy Link</button>
 172     </div>
 173   );
 174 });
 175
 176 const PlayerInfo = React.memo(props => {
 177   if (! props.player.id)
 178     return null;
 179
 180   return (
 181     <div className="player-info">
 182       <span className="players-header">Players: </span>
 183       {props.player.name}
 184       {props.player.score > 0 ? ` (${props.player.score})` : ""}
 185       {props.other_players.map(other => (
 186         <span key={other.id}>
 187           {", "}
 188           {other.name}
 189           {other.score > 0 ? ` (${other.score})` : ""}
 190         </span>
 191       ))}
 192     </div>
 193   );
 194 });
 195
 196 function fetch_method_json(method, api = '', data = {}) {
 197   const response = fetch(api, {
 198     method: method,
 199     headers: {
 200       'Content-Type': 'application/json'
 201     },
 202     body: JSON.stringify(data)
 203   });
 204   return response;
 205 }
 206
 207 function fetch_post_json(api = '', data = {}) {
 208   return fetch_method_json('POST', api, data);
 209 }
 210
 211 async function fetch_put_json(api = '', data = {}) {
 212   return fetch_method_json('PUT', api, data);
 213 }
 214
 215 class CategoryRequest extends React.PureComponent {
 216   constructor(props) {
 217     super(props);
 218     this.category = React.createRef();
 219
 220     this.handle_change = this.handle_change.bind(this);
 221     this.handle_submit = this.handle_submit.bind(this);
 222   }
 223
 224   handle_change(event) {
 225     const category_input = this.category.current;
 226     const category = category_input.value;
 227
 228     const match = category.match(/[0-9]+/);
 229     if (match) {
 230       const num_items = parseInt(match[0], 10);
 231       if (num_items <= MAX_PROMPT_ITEMS)
 232         category_input.setCustomValidity("");
 233     }
 234   }
 235
 236   async handle_submit(event) {
 237     const form = event.currentTarget;
 238     const category_input = this.category.current;
 239     const category = category_input.value;
 240
 241     /* Prevent the default page-changing form-submission behavior. */
 242     event.preventDefault();
 243
 244     const match = category.match(/[0-9]+/);
 245     if (match === null) {
 246       category_input.setCustomValidity("Category must include a number");
 247       form.reportValidity();
 248       return;
 249     }
 250
 251     const num_items = parseInt(match[0], 10);
 252
 253     if (num_items > MAX_PROMPT_ITEMS) {
 254       category_input.setCustomValidity(`Maximum number of items is ${MAX_PROMPT_ITEMS}`);
 255       form.reportValidity();
 256       return;
 257     }
 258
 259     const response = await fetch_post_json("prompts", {
 260       items: num_items,
 261       prompt: category
 262     });
 263
 264     if (response.status === 200) {
 265       const result = await response.json();
 266       if (! result.valid) {
 267         add_message("danger", result.message);
 268         return;
 269       }
 270     } else {
 271       add_message("danger", "An error occurred submitting your category");
 272     }
 273
 274     form.reset();
 275   }
 276
 277   render() {
 278     return (
 279       <div className="category-request">
 280         <h2>Submit a Category</h2>
 281         <p>
 282           Suggest a category to play. Don't forget to include the
 283           number of items for each person to submit.
 284         </p>
 285
 286         <form onSubmit={this.handle_submit} >
 287           <div className="form-field large">
 288             <input
 289               type="text"
 290               id="category"
 291               placeholder="6 things at the beach"
 292               required
 293               autoComplete="off"
 294               onChange={this.handle_change}
 295               ref={this.category}
 296             />
 297           </div>
 298
 299           <div className="form-field large">
 300             <button type="submit">
 301               Send
 302             </button>
 303           </div>
 304
 305         </form>
 306       </div>
 307     );
 308   }
 309 }
 310
 311 const PromptOptions = React.memo(props => {
 312
 313   if (props.prompts.length === 0)
 314     return null;
 315
 316   return (
 317     <div className="prompt-options">
 318       <h2>Vote on Categories</h2>
 319       <p>
 320         Select any categories below that you'd like to play.
 321         You can choose as many as you'd like.
 322       </p>
 323       {props.prompts.map(p => {
 324         return (
 325           <button
 326             className="vote-button"
 327             key={p.id}
 328             onClick={() => fetch_post_json(`vote/${p.id}`) }
 329           >
 330             {p.prompt}
 331             <div className="vote-choices">
 332               {p.votes.map(v => {
 333                 return (
 334                   <div
 335                     key={v}
 336                     className="vote-choice"
 337                   >
 338                     {v}
 339                   </div>
 340                 );
 341               })}
 342             </div>
 343           </button>
 344         );
 345       })}
 346     </div>
 347   );
 348 });
 349
 350 const LetsPlay = React.memo(props => {
 351
 352   function handle_click(prompt_id) {
 353     fetch_post_json
 354   }
 355
 356   const quorum = Math.round((props.num_players + 1) / 2);
 357   const max_votes = props.prompts.reduce(
 358     (max_so_far, v) => Math.max(max_so_far, v.votes.length), 0);
 359
 360   if (max_votes < quorum)
 361     return null;
 362
 363   const candidates = props.prompts.filter(p => p.votes.length >= quorum);
 364   const index = Math.floor(Math.random() * candidates.length);
 365   const winner = candidates[index];
 366
 367   return (
 368     <div className="lets-play">
 369       <h2>Let's Play</h2>
 370       <p>
 371         That should be enough voting. If you're not waiting for any
 372         other players to join, then let's start.
 373       </p>
 374       <button
 375         className="lets-play"
 376         onClick={() => fetch_post_json(`start/${winner.id}`) }
 377       >
 378         Start Game
 379       </button>
 380     </div>
 381   );
 382 });
 383
 384 class Ambiguities extends React.PureComponent {
 385
 386   constructor(props) {
 387     super(props);
 388
 389     const word_sets = props.words.map(word => {
 390       const set = new Set();
 391       set.add(word);
 392       return set;
 393     });
 394
 395     this.state = {
 396       word_sets: word_sets,
 397       submitted: false,
 398       selected: null
 399     };
 400   }
 401
 402   async handle_submit() {
 403     const response = await fetch_post_json(
 404       `judging/${this.props.prompt.id}`,{
 405         word_groups: this.state.word_sets.map(set => Array.from(set))
 406       }
 407     );
 408
 409     if (response.status === 200) {
 410       const result = await response.json();
 411       if (! result.valid) {
 412         add_message("danger", result.message);
 413         return;
 414       }
 415     } else {
 416       add_message("danger", "An error occurred submitting your answers");
 417       return;
 418     }
 419
 420     this.setState({
 421       submitted: true
 422     });
 423   }
 424
 425   handle_click(word) {
 426     if (this.state.selected == word) {
 427       /* Second click on same word removes the word from the group. */
 428       const idx = this.state.word_sets.findIndex(s => s.has(word));
 429       const set = this.state.word_sets[idx];
 430       if (set.size === 1)
 431         return;
 432       const new_set = new Set([...set].filter(w => w !== word));
 433       this.setState({
 434         selected: null,
 435         word_sets: [...this.state.word_sets.slice(0, idx),
 436                     new_set,
 437                     new Set().add(word),
 438                     ...this.state.word_sets.slice(idx+1)]
 439       });
 440     } else if (this.state.selected) {
 441       /* Click of a second word groups the two together. */
 442       const idx1 = this.state.word_sets.findIndex(s => s.has(this.state.selected));
 443       const idx2 = this.state.word_sets.findIndex(s => s.has(word));
 444       const set1 = this.state.word_sets[idx1];
 445       const set2 = this.state.word_sets[idx2];
 446       const new_set = new Set([...set2, ...set1]);
 447       if (idx1 < idx2) {
 448         this.setState({
 449           selected: null,
 450           word_sets: [...this.state.word_sets.slice(0, idx1),
 451                       ...this.state.word_sets.slice(idx1 + 1, idx2),
 452                       new_set,
 453                       ...this.state.word_sets.slice(idx2 + 1)]
 454         });
 455       } else {
 456         this.setState({
 457           selected: null,
 458           word_sets: [...this.state.word_sets.slice(0, idx2),
 459                       new_set,
 460                       ...this.state.word_sets.slice(idx2 + 1, idx1),
 461                       ...this.state.word_sets.slice(idx1 + 1)]
 462         });
 463       }
 464     } else {
 465       /* First click of a word selects it. */
 466       this.setState({
 467         selected: word
 468       });
 469     }
 470   }
 471
 472   render() {
 473     if (this.state.submitted)
 474       return (
 475         <div className="please-wait">
 476           <h2>Submission received</h2>
 477           <p>
 478             The following players have completed judging:
 479             {[...this.props.players_judged].join(', ')}
 480           </p>
 481           <p>
 482             Still waiting for the following players:
 483           </p>
 484           <ul>
 485             {Object.entries(this.props.players_judging).map(player => {
 486               return (
 487                 <li
 488                   key={player}
 489                 >
 490                   {player}
 491                   {this.props.players_judging[player] ?
 492                    <span className="typing"/> : null }
 493                 </li>
 494               );
 495             })}
 496           </ul>
 497           <button
 498             className="vote-button"
 499             onClick={() => fetch_post_json(`end-judging/${this.props.prompt.id}`) }
 500           >
 501             Move On
 502             <div className="vote-choices">
 503               {[...this.props.votes].map(v => {
 504                 return (
 505                   <div
 506                     key={v}
 507                     className="vote-choice"
 508                   >
 509                     {v}
 510                   </div>
 511                 );
 512               })}
 513             </div>
 514           </button>
 515
 516         </div>
 517       );
 518
 519     const btn_class = "ambiguity-button";
 520     const btn_selected_class = btn_class + " selected";
 521
 522     return (
 523       <div className="ambiguities">
 524         <h2>Judging Answers</h2>
 525         <p>
 526           Click on each pair of answers that should be scored as equivalent,
 527           (and click any word twice to split it out from a group). Remember,
 528           what goes around comes around, so it's best to be generous when
 529           judging.
 530         </p>
 531         {this.state.word_sets.map(set => {
 532           return (
 533             <div
 534               className="ambiguity-group"
 535               key={Array.from(set)[0]}
 536             >
 537               {Array.from(set).map(word => {
 538                 return (
 539                   <button
 540                     className={this.state.selected === word ?
 541                                btn_selected_class : btn_class }
 542                     key={word}
 543                     onClick={() => this.handle_click(word)}
 544                   >
 545                     {word}
 546                   </button>
 547                 );
 548               })}
 549             </div>
 550           );
 551         })}
 552         <p>
 553           Click here when done judging:<br/>
 554           <button
 555             onClick={() => this.handle_submit()}
 556           >
 557             Send
 558           </button>
 559         </p>
 560       </div>
 561     );
 562   }
 563 }
 564
 565 class ActivePrompt extends React.PureComponent {
 566
 567   constructor(props) {
 568     super(props);
 569     const items = props.prompt.items;
 570
 571     this.state = {
 572       submitted: false
 573     };
 574
 575     this.answers = [...Array(items)].map(() => React.createRef());
 576     this.handle_submit = this.handle_submit.bind(this);
 577   }
 578
 579   async handle_submit(event) {
 580     const form = event.currentTarget;
 581
 582     /* Prevent the default page-changing form-submission behavior. */
 583     event.preventDefault();
 584
 585     const response = await fetch_post_json(`answer/${this.props.prompt.id}`, {
 586       answers: this.answers.map(r => r.current.value)
 587     });
 588     if (response.status === 200) {
 589       const result = await response.json();
 590       if (! result.valid) {
 591         add_message("danger", result.message);
 592         return;
 593       }
 594     } else {
 595       add_message("danger", "An error occurred submitting your answers");
 596       return;
 597     }
 598
 599     /* Everything worked. Server is happy with our answers. */
 600     form.reset();
 601     this.setState({
 602         submitted: true
 603     });
 604   }
 605
 606   render() {
 607     if (this.state.submitted)
 608       return (
 609         <div className="please-wait">
 610           <h2>Submission received</h2>
 611           <p>
 612             The following players have submitted their answers:
 613             {[...this.props.players_answered].join(', ')}
 614           </p>
 615           <p>
 616           Still waiting for the following players:
 617           </p>
 618           <ul>
 619             {Object.entries(this.props.players_answering).map(player => {
 620               return (
 621                 <li
 622                   key={player}
 623                 >
 624                   {player}
 625                   {this.props.players_answering[player] ?
 626                    <span className="typing"/> : null }
 627                 </li>
 628               );
 629             })}
 630           </ul>
 631           <button
 632             className="vote-button"
 633             onClick={() => fetch_post_json(`end-answers/${this.props.prompt.id}`) }
 634           >
 635             Move On
 636             <div className="vote-choices">
 637               {[...this.props.votes].map(v => {
 638                 return (
 639                   <div
 640                     key={v}
 641                     className="vote-choice"
 642                   >
 643                     {v}
 644                   </div>
 645                 );
 646               })}
 647             </div>
 648           </button>
 649
 650         </div>
 651       );
 652
 653     return (
 654       <div className="active-prompt">
 655         <h2>The Game of Empathy</h2>
 656         <p>
 657           Remember, you're trying to match your answers with
 658           what the other players submit.
 659           Give {this.props.prompt.items} answers for the following prompt:
 660         </p>
 661         <h2>{this.props.prompt.prompt}</h2>
 662         <form onSubmit={this.handle_submit}>
 663           {[...Array(this.props.prompt.items)].map((whocares,i) => {
 664             return (
 665               <div
 666                 key={i}
 667                 className="form-field large">
 668                 <input
 669                   type="text"
 670                   name={`answer_${i}`}
 671                   required
 672                   autoComplete="off"
 673                   ref={this.answers[i]}
 674                 />
 675               </div>
 676             );
 677           })}
 678
 679           <div
 680             key="submit-button"
 681             className="form-field large">
 682             <button type="submit">
 683               Send
 684             </button>
 685           </div>
 686
 687         </form>
 688       </div>
 689     );
 690   }
 691 }
 692
 693 class Game extends React.PureComponent {
 694   constructor(props) {
 695     super(props);
 696     this.state = {
 697       game_info: {},
 698       player_info: {},
 699       other_players: [],
 700       prompts: [],
 701       active_prompt: null,
 702       players_answered: new Set(),
 703       players_answering: {},
 704       end_answers_votes: new Set(),
 705       ambiguities: null,
 706       players_judged: new Set(),
 707       players_judging: {},
 708       end_judging_votes: new Set(),
 709       scores: null
 710     };
 711   }
 712
 713   set_game_info(info) {
 714     this.setState({
 715       game_info: info
 716     });
 717   }
 718
 719   set_player_info(info) {
 720     this.setState({
 721       player_info: info
 722     });
 723   }
 724
 725   set_other_player_info(info) {
 726     const other_players_copy = [...this.state.other_players];
 727     const idx = other_players_copy.findIndex(o => o.id === info.id);
 728     if (idx >= 0) {
 729       other_players_copy[idx] = info;
 730     } else {
 731       other_players_copy.push(info);
 732     }
 733     this.setState({
 734       other_players: other_players_copy
 735     });
 736   }
 737
 738   reset_game_state() {
 739     this.setState({
 740       prompts: [],
 741       active_prompt: null,
 742       players_answered: new Set(),
 743       players_answering: {},
 744       end_answers_votes: new Set(),
 745       ambiguities: null,
 746       players_judged: new Set(),
 747       players_judging: {},
 748       end_judging_votes: new Set(),
 749       scores: null
 750     });
 751   }
 752
 753   set_prompts(prompts) {
 754     this.setState({
 755       prompts: prompts
 756     });
 757   }
 758
 759   add_or_update_prompt(prompt) {
 760     const prompts_copy = [...this.state.prompts];
 761     const idx = prompts_copy.findIndex(p => p.id === prompt.id);
 762     if (idx >= 0) {
 763       prompts_copy[idx] = prompt;
 764     } else {
 765       prompts_copy.push(prompt);
 766     }
 767     this.setState({
 768       prompts: prompts_copy
 769     });
 770   }
 771
 772   set_active_prompt(prompt) {
 773     this.setState({
 774       active_prompt: prompt
 775     });
 776   }
 777
 778   set_player_answered(player) {
 779     const new_players_answering = {...this.state.players_answering};
 780     delete new_players_answering[player];
 781
 782     this.setState({
 783       players_answered: new Set([...this.state.players_answered, player]),
 784       players_answering: new_players_answering
 785     });
 786   }
 787
 788   set_player_answering(player) {
 789     this.setState({
 790       players_answering: {
 791         ...this.state.players_answering,
 792         [player]: {active: true}
 793       }
 794     });
 795   }
 796
 797   set_player_vote_end_answers(player) {
 798     this.setState({
 799       end_answers_votes: new Set([...this.state.end_answers_votes, player])
 800     });
 801   }
 802
 803   set_player_unvote_end_answers(player) {
 804     this.setState({
 805       end_answers_votes: new Set([...this.state.end_answers_votes].filter(p => p !== player))
 806     });
 807   }
 808
 809   set_ambiguities(ambiguities) {
 810     this.setState({
 811       ambiguities: ambiguities
 812     });
 813   }
 814
 815   set_player_judged(player) {
 816     const new_players_judging = {...this.state.players_judging};
 817     delete new_players_judging[player];
 818
 819     this.setState({
 820       players_judged: new Set([...this.state.players_judged, player]),
 821       players_judging: new_players_judging
 822     });
 823   }
 824
 825   set_player_judging(player) {
 826     this.setState({
 827       players_judging: {
 828         ...this.state.players_judging,
 829         [player]: {active: true}
 830       }
 831     });
 832   }
 833
 834
 835   set_player_vote_end_judging(player) {
 836     this.setState({
 837       end_judging_votes: new Set([...this.state.end_judging_votes, player])
 838     });
 839   }
 840
 841   set_player_unvote_end_judging(player) {
 842     this.setState({
 843       end_judging_votes: new Set([...this.state.end_judging_votes].filter(p => p !== player))
 844     });
 845   }
 846
 847   set_scores(scores) {
 848     this.setState({
 849       scores: scores
 850     });
 851   }
 852
 853   render() {
 854     const state = this.state;
 855     const players_total = 1 + state.other_players.length;
 856
 857     if (state.scores) {
 858       return (
 859         <div className="scores">
 860           <h2>Scores</h2>
 861           <ul>
 862             {state.scores.scores.map(score => {
 863               return (
 864                 <li key={score.player}>
 865                   {score.player}: {score.score}
 866                 </li>
 867               );
 868             })}
 869           </ul>
 870           <h2>Words submitted</h2>
 871           <ul>
 872             {state.scores.words.map(word => {
 873               return (
 874                 <li key={word.word}>
 875                   {`${word.word}: ${word.players.join(', ')}`}
 876                 </li>
 877               );
 878             })}
 879           </ul>
 880           <button
 881             className="new-game"
 882             onClick={() => fetch_post_json('reset') }
 883           >
 884             New Game
 885           </button>
 886         </div>
 887       );
 888     }
 889
 890     if (state.ambiguities){
 891       return <Ambiguities
 892                prompt={state.active_prompt}
 893                words={state.ambiguities}
 894                players_judged={state.players_judged}
 895                players_judging={state.players_judging}
 896                votes={state.end_judging_votes}
 897              />;
 898     }
 899
 900     if (state.active_prompt) {
 901       return <ActivePrompt
 902                prompt={state.active_prompt}
 903                players_answered={state.players_answered}
 904                players_answering={state.players_answering}
 905                votes={state.end_answers_votes}
 906              />;
 907     }
 908
 909     return [
 910       <GameInfo
 911         key="game-info"
 912         id={state.game_info.id}
 913         url={state.game_info.url}
 914       />,
 915       <PlayerInfo
 916         key="player-info"
 917         game={this}
 918         player={state.player_info}
 919         other_players={state.other_players}
 920       />,
 921       <p key="spacer"></p>,
 922       <CategoryRequest
 923         key="category-request"
 924       />,
 925       <PromptOptions
 926         key="prompts"
 927         prompts={state.prompts}
 928       />,
 929       <LetsPlay
 930         key="lets-play"
 931         num_players={1+state.other_players.length}
 932         prompts={state.prompts}
 933       />
 934     ];
 935   }
 936 }
 937
 938 ReactDOM.render(<Game
 939                   ref={(me) => window.game = me}
 940                 />, document.getElementById("empathy"));