git.cworth.org Git - lmno-server/blob - empires.js

   1 const express = require("express");
   2 const Game = require("./game.js");
   3
   4 const GamePhase = {
   5   JOIN:    1,
   6   REVEAL:  2,
   7   CAPTURE: 3,
   8   properties: {
   9     1: {name: "join"},
  10     2: {name: "reveal"},
  11     3: {name: "capture"}
  12   }
  13 };
  14
  15 /**
  16  * Shuffles array in place.
  17  * @param {Array} a items An array containing the items.
  18  */
  19 function shuffle(a) {
  20   if (a === undefined)
  21     return;
  22
  23   var j, x, i;
  24   for (i = a.length - 1; i > 0; i--) {
  25     j = Math.floor(Math.random() * (i + 1));
  26     x = a[i];
  27     a[i] = a[j];
  28     a[j] = x;
  29   }
  30 }
  31
  32 class Empires extends Game {
  33   constructor(id) {
  34     super(id);
  35     this._spectators = [];
  36     this.next_spectator_id = 1;
  37     this._players = [];
  38     this.next_player_id = 1;
  39     this.characters_to_reveal = null;
  40     this.phase = GamePhase.JOIN;
  41   }
  42
  43   add_spectator(name, session_id) {
  44     /* Don't add another spectator that matches an existing session. */
  45     const existing = this._spectators.findIndex(
  46       spectator => spectator.session_id === session_id);
  47     if (existing >= 0)
  48       return existing.id;
  49
  50     const new_spectator = {id: this.next_spectator_id,
  51                            name: name,
  52                            session_id: session_id
  53                           };
  54     this._spectators.push(new_spectator);
  55     this.next_spectator_id++;
  56     this.broadcast_event("spectator-join", JSON.stringify(new_spectator));
  57
  58     return new_spectator.id;
  59   }
  60
  61   remove_spectator(id) {
  62     const index = this._spectators.findIndex(spectator => spectator.id === id);
  63     this._spectators.splice(index, 1);
  64
  65     this.broadcast_event("spectator-leave", `{"id": ${id}}`);
  66   }
  67
  68   register_player(name, character) {
  69     const new_player = {id: this.next_player_id,
  70                        name: name,
  71                        character: character,
  72                        captures: [],
  73                        };
  74     this._players.push(new_player);
  75     this.next_player_id++;
  76     /* The syntax here is using an anonymous function to create a new
  77       object from new_player with just the subset of fields that we
  78       want. */
  79     const player_data = JSON.stringify((({id, name}) => ({id, name}))(new_player));
  80     this.broadcast_event("player-join", player_data);
  81
  82     return new_player;
  83   }
  84
  85   remove_player(id) {
  86     const index = this._players.findIndex(player => player.id === id);
  87     this._players.splice(index, 1);
  88
  89     this.broadcast_event("player-leave", `{"id": ${id}}`);
  90   }
  91
  92   reset() {
  93     this._players = [];
  94     this.characters_to_reveal = null;
  95     this.next_player_id = 1;
  96
  97     this.change_phase(GamePhase.JOIN);
  98
  99     this.broadcast_event("spectators", "{}");
 100     this.broadcast_event("players", "{}");
 101   }
 102
 103   reveal_next() {
 104     /* Don't try to reveal anything if we aren't in the reveal phase. */
 105     if (this.phase != GamePhase.REVEAL) {
 106       clearInterval(this.reveal_interval);
 107       return;
 108     }
 109
 110     if (this.reveal_index >= this.characters_to_reveal.length) {
 111       clearInterval(this.reveal_interval);
 112       this.broadcast_event("character-reveal", '{"character":""}');
 113       return;
 114     }
 115     const character = this.characters_to_reveal[this.reveal_index];
 116     this.reveal_index++;
 117     const character_data = JSON.stringify({"character":character});
 118     this.broadcast_event("character-reveal", character_data);
 119   }
 120
 121   reveal() {
 122     this.change_phase(GamePhase.REVEAL);
 123
 124     if (this.characters_to_reveal === null) {
 125       this.characters_to_reveal = [];
 126       this.characters_to_reveal = this._players.reduce((characters, player) => {
 127         characters.push(player.character);
 128         return characters;
 129       }, []);
 130       shuffle(this.characters_to_reveal);
 131     }
 132
 133     this.reveal_index = 0;
 134
 135     this.reveal_interval = setInterval(this.reveal_next.bind(this), 3000);
 136   }
 137
 138   start() {
 139     this.change_phase(GamePhase.CAPTURE);
 140   }
 141
 142   capture(captor_id, captee_id) {
 143     /* TODO: Fix to fail on already-captured players (or to move the
 144      * captured player from an old captor to a new—need to clarify in
 145      * the API specification which we want here. */
 146     let captor = this._players.find(player => player.id === captor_id);
 147     captor.captures.push(captee_id);
 148
 149     this.broadcast_event("capture", `{"captor": ${captor_id}, "captee": ${captee_id}}`);
 150   }
 151
 152   liberate(captee_id) {
 153     let captor = this._players.find(player => player.captures.includes(captee_id));
 154     captor.captures.splice(captor.captures.indexOf(captee_id), 1);
 155   }
 156
 157   restart() {
 158     for (const player of this._players) {
 159       player.captures = [];
 160     }
 161   }
 162
 163   get characters() {
 164     return this._players.map(player => player.character);
 165   }
 166
 167   get empires() {
 168     return this._players.map(player => ({id: player.id, captures: player.captures}));
 169   }
 170
 171   get spectators() {
 172     /* We return only "id" and "name" here (specifically not session_id!). */
 173     return this._spectators.map(spectator => ({
 174       id: spectator.id,
 175       name: spectator.name
 176     }));
 177   }
 178
 179   /* The base class recently acquired Game.players which works like
 180    * Empires.spectators, (and meanwhile the Empires._players
 181    * functionality could perhaps be reworked into
 182    * Game.players[].team). Until we do that rework, lets use
 183    * .registered_players as the getter for the Empires-specific
 184    * ._players property to avoid mixing it up with the distinct
 185    * Game.players property. */
 186   get registered_players() {
 187     return this._players.map(player => ({id: player.id, name: player.name }));
 188   }
 189
 190   game_phase_event_data(old_phase, new_phase) {
 191     var old_phase_name;
 192     if (old_phase)
 193       old_phase_name = GamePhase.properties[old_phase].name;
 194     else
 195       old_phase_name = "none";
 196     const new_phase_name = GamePhase.properties[new_phase].name;
 197
 198     return `{"old_phase":"${old_phase_name}","new_phase":"${new_phase_name}"}`;
 199   }
 200
 201   /* Inform clients about a phase change. */
 202   broadcast_phase_change() {
 203     const event_data = this.game_phase_event_data(this.old_phase, this.phase);
 204     this.broadcast_event("game-phase", event_data);
 205   }
 206
 207   /* Change game phase and broadcast the change to all clients. */
 208   change_phase(phase) {
 209     /* Do nothing if there is no actual change happening. */
 210     if (phase === this.phase)
 211       return;
 212
 213     this.old_phase = this.phase;
 214     this.phase = phase;
 215
 216     this.broadcast_phase_change();
 217   }
 218
 219   handle_events(request, response) {
 220
 221     super.handle_events(request, response);
 222
 223     /* Now that a client has connected, first we need to stream all of
 224      * the existing spectators and players (if any). */
 225     if (this._spectators.length > 0) {
 226       const spectators_json = JSON.stringify(this.spectators);
 227       const spectators_data = `event: spectators\ndata: ${spectators_json}\n\n`;
 228       response.write(spectators_data);
 229     }
 230
 231     if (this._players.length > 0) {
 232       const players_json = JSON.stringify(this.registered_players);
 233       const players_data = `event: players\ndata: ${players_json}\n\n`;
 234       response.write(players_data);
 235     }
 236
 237     /* And we need to inform the client of the current game phase.
 238      *
 239      * In fact, we need to cycle through each phase transition from the
 240      * beginning so the client can see each.
 241      */
 242     var old_phase = null;
 243     for (var phase = GamePhase.JOIN; phase <= this.phase; phase++) {
 244       var event_data = this.game_phase_event_data(old_phase, phase);
 245       response.write("event: game-phase\n" + "data: " + event_data + "\n\n");
 246       old_phase = phase;
 247     }
 248   }
 249
 250 }
 251
 252 Empires.router = express.Router();
 253 const router = Empires.router;
 254
 255 router.post('/spectator', (request, response) => {
 256   const game = request.game;
 257   var name = request.session.nickname;
 258
 259   /* If the request includes a name, that overrides the session nickname. */
 260   if (request.body.name)
 261     name = request.body.name;
 262
 263   const id = game.add_spectator(name, request.session.id);
 264   response.send(JSON.stringify(id));
 265 });
 266
 267 router.delete('/spectator/:id', (request, response) => {
 268   const game = request.game;
 269   game.remove_spectator(parseInt(request.params.id));
 270   response.send();
 271 });
 272
 273 router.post('/register', (request, response) => {
 274   const game = request.game;
 275   var name = request.session.nickname;;
 276
 277   /* If the request includes a name, that overrides the session nickname. */
 278   if (request.body.name)
 279     name = request.body.name;
 280
 281   const player = game.register_player(name, request.body.character);
 282   response.send(JSON.stringify(player.id));
 283 });
 284
 285 router.post('/deregister/:id', (request, response) => {
 286   const game = request.game;
 287   game.remove_player(parseInt(request.params.id));
 288   response.send();
 289 });
 290
 291 router.post('/reveal', (request, response) => {
 292   const game = request.game;
 293   game.reveal();
 294   response.send();
 295 });
 296
 297 router.post('/start', (request, response) => {
 298   const game = request.game;
 299   game.start();
 300   response.send();
 301 });
 302
 303 router.post('/reset', (request, response) => {
 304   const game = request.game;
 305   game.reset();
 306   response.send();
 307 });
 308
 309 router.post('/capture/:captor/:captee', (request, response) => {
 310   const game = request.game;
 311   game.capture(parseInt(request.params.captor), parseInt(request.params.captee));
 312   response.send();
 313 });
 314
 315 router.post('/liberate/:id', (request, response) => {
 316   const game = request.game;
 317   game.liberate(parseInt(request.params.id));
 318   response.send();
 319 });
 320
 321 router.post('/restart', (request, response) => {
 322   const game = request.game;
 323   game.restart(parseInt(request.params.id));
 324     response.send();
 325 });
 326
 327 router.get('/characters', (request, response) => {
 328   const game = request.game;
 329   response.send(game.characters);
 330 });
 331
 332 router.get('/empires', (request, response) => {
 333   const game = request.game;
 334   response.send(game.empires);
 335 });
 336
 337 router.get('/spectators', (request, response) => {
 338   const game = request.game;
 339   response.send(game.spectators);
 340 });
 341
 342 router.get('/players', (request, response) => {
 343   const game = request.game;
 344   response.send(game.registered_players);
 345 });
 346
 347 Empires.meta = {
 348   name: "Empires",
 349   identifier: "empires"
 350 };
 351
 352 exports.Game = Empires;