Empathy: Add support for starting the actual game

When a request is received at "/start" to start a particular prompt,
the server responds by broadcasting a "start" event to all clients
telling them to start the game.

The prompt is also set as the active prompt in the game state so that
if any new client joins while a prompt is active they will become
aware of that.

diff --git a/empathy.js b/empathy.js
index 7a75b71ecdd12a071945cdb89c0a8530cf38ce94..8ecf9e10fc9bb26e2a2068a65dfb87a420138b15 100644 (file)
--- a/empathy.js
+++ b/empathy.js
@@ -5,7 +5,8 @@ class Empathy extends Game {
   constructor(id) {
     super(id);
     this.state = {
-      prompts: []
+      prompts: [],
+      active_prompt: null
     };
     this.next_prompt_id = 1;
   }
@@ -35,6 +36,19 @@ class Empathy extends Game {
 
     return true;
   }
+
+  /* Returns true on success, false for prompt not found. */
+  start(prompt_id) {
+    const prompt = this.state.prompts.find(p => p.id === prompt_id);
+    if (! prompt)
+      return false;
+
+    this.state.active_prompt = prompt;
+
+    this.broadcast_event_object('start', prompt);
+
+    return true;
+  }
 }
 
 Empathy.router = express.Router();
@@ -72,6 +86,16 @@ router.post('/vote/:prompt_id([0-9]+)', (request, response) => {
     response.sendStatus(404);
 });
 
+router.post('/start/:prompt_id([[0-9]+)', (request, response) => {
+  const game = request.game;
+  const prompt_id = parseInt(request.params.prompt_id, 10);
+
+  if (game.start(prompt_id))
+    response.sendStatus(200);
+  else
+    response.sendStatus(404);
+});
+
 Empathy.meta = {
   name: "Empathy",
   identifier: "empathy",