give coin with react

Reviewed-on: #1

coin.rb

@@ -8,6 +8,7 @@ COIN_TIMEOUT = 15
 SCOREBOARD = './scoreboard.yml'
 DUMBASS = 521596582962003968
 DUMBASS_BOT = 1034966228755820575
+COIN_EMOJI = '🪙'
 
 coin_state_active = false
 coins_offered_today = 0
@@ -98,6 +99,25 @@ bot.message(from: DUMBASS_BOT) do |event|
 
 end
 
+bot.reaction_add do |event|
+  next unless event.emoji.name == COIN_EMOJI
+  reactor_coins = get_coin_count(event.user.id)
+  if reactor_coins == 0
+    event.respond("<@#{event.user.id}>, you're a poor shmuck!")
+    next
+  end
+
+  if event.message.author == event.user
+    event.respond("<@#{event.user.id}>, you can't give coins to yourself!")
+    next
+  end
+
+  increment_coin(event.message.author.id)
+  increment_coin(event.user.id, -1)
+
+  event.respond "<@#{event.message.author.id}>, you have been given a coin by <@#{event.user.id}>!"
+end
+
 bot.run(true)
 
 loop do