1 files changed, 57 insertions, 0 deletions
diff --git a/bot/exts/evergreen/rps.py b/bot/exts/evergreen/rps.py
new file mode 100644
index 00000000..c6bbff46
--- /dev/null
+++ b/bot/exts/evergreen/rps.py
@@ -0,0 +1,57 @@
+from random import choice
+
+from discord.ext import commands
+
+from bot.bot import Bot
+
+CHOICES = ["rock", "paper", "scissors"]
+SHORT_CHOICES = ["r", "p", "s"]
+
+# Using a dictionary instead of conditions to check for the winner.
+WINNER_DICT = {
+    "r": {
+        "r": 0,
+        "p": -1,
+        "s": 1,
+    },
+    "p": {
+        "r": 1,
+        "p": 0,
+        "s": -1,
+    },
+    "s": {
+        "r": -1,
+        "p": 1,
+        "s": 0,
+    }
+}
+
+
+class RPS(commands.Cog):
+    """Rock Paper Scissors. The Classic Game!"""
+
+    @commands.command(case_insensitive=True)
+    async def rps(self, ctx: commands.Context, move: str) -> None:
+        """Play the classic game of Rock Paper Scissors with your own sir-lancebot!"""
+        move = move.lower()
+        player_mention = ctx.author.mention
+
+        if move not in CHOICES and move not in SHORT_CHOICES:
+            raise commands.BadArgument(f"Invalid move. Please make move from options: {', '.join(CHOICES).upper()}.")
+
+        bot_move = choice(CHOICES)
+        # value of player_result will be from (-1, 0, 1) as (lost, tied, won).
+        player_result = WINNER_DICT[move[0]][bot_move[0]]
+
+        if player_result == 0:
+            message_string = f"{player_mention} You and Sir Lancebot played {bot_move}, it's a tie."
+            await ctx.send(message_string)
+        elif player_result == 1:
+            await ctx.send(f"Sir Lancebot played {bot_move}! {player_mention} won!")
+        else:
+            await ctx.send(f"Sir Lancebot played {bot_move}! {player_mention} lost!")
+
+
+def setup(bot: Bot) -> None:
+    """Load the RPS Cog."""
+    bot.add_cog(RPS(bot))