Make target_rating_diff an absolute value

Author: Torom

config.yml.default

@@ -220,7 +220,7 @@ matchmaking:
 #     multiplier: 15                      # Multiplier for calculating timeouts in matchmaking. Default: smart multiplier calculation.
 #     min_rating_diff: 0                  # Minimum rating distance to opponent. Default: 0
 #     max_rating_diff: 300                # Maximum rating distance to opponent.
-#     target_rating_diff: -50             # Rating distance to opponent that is challenged first. Default: 0
+#     target_rating_diff: 50              # Rating distance to opponent that is challenged first. Default: 0
 
 messages:
   # Optional substitution keywords (include curly braces):

opponents.py

@@ -97,7 +97,7 @@ def bot_filter(bot: Bot) -> bool:
             return True
 
         def sort_key(bot: Bot) -> int:
-            return abs(bot.ratings[perf_type] - (user_ratings[perf_type] + matchmaking_type.target_rating_diff))
+            return abs(abs(bot.ratings[perf_type] - user_ratings[perf_type]) - matchmaking_type.target_rating_diff)
 
         bots = sorted(filter(bot_filter, bots), key=sort_key)
         if not bots: