Add support for negative votes for categories

Just like the positive votes, the endpoint allows toggling and the
storage maintains that each player can only vote for (or against)
once.

diff --git a/empathy.js b/empathy.js
index ba25cc4c49d7e996ba2c93505efc0ab2ba75b9d8..7710892819235061d0710b14386c2cc1d8786877 100644 (file)
--- a/empathy.js
+++ b/empathy.js
@@ -148,6 +148,20 @@ class Empathy extends Game {
     return true;
   }
 
+  toggle_vote_against(prompt_id, session_id) {
+    const player = this.players_by_session[session_id];
+
+    const prompt = this.state.prompts.find(p => p.id === prompt_id);
+    if (! prompt || ! player)
+      return false;
+
+    prompt.toggle_vote_against(player.name);
+
+    this.broadcast_event_object('prompt', prompt);
+
+    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);
@@ -572,6 +586,7 @@ class Prompt {
     this.items = items;
     this.prompt = prompt;
     this.votes = [];
+    this.votes_against = [];
   }
 
   toggle_vote(player_name) {
@@ -580,6 +595,13 @@ class Prompt {
     else
       this.votes.push(player_name);
   }
+
+  toggle_vote_against(player_name) {
+    if (this.votes_against.find(v => v === player_name))
+      this.votes_against = this.votes_against.filter(v => v !== player_name);
+    else
+      this.votes_against.push(player_name);
+  }
 }
 
 router.post('/prompts', (request, response) => {
@@ -600,6 +622,16 @@ router.post('/vote/:prompt_id([0-9]+)', (request, response) => {
     response.sendStatus(404);
 });
 
+router.post('/vote_against/:prompt_id([0-9]+)', (request, response) => {
+  const game = request.game;
+  const prompt_id = parseInt(request.params.prompt_id, 10);
+
+  if (game.toggle_vote_against(prompt_id, request.session.id))
+    response.send('');
+  else
+    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);