From 7200fcf3f4e4c22193b5b96452f9aa5131b1bc1c Mon Sep 17 00:00:00 2001
From: Martin Kagamino Lehoux <martin@lehoux.net>
Date: Sun, 19 Feb 2023 12:57:27 +0100
Subject: refactor: Move to src

---
 src/strategy.py | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 src/strategy.py

(limited to 'src/strategy.py')

diff --git a/src/strategy.py b/src/strategy.py
new file mode 100644
index 0000000..6713299
--- /dev/null
+++ b/src/strategy.py
@@ -0,0 +1,40 @@
+from typing import Protocol
+
+from src.game import Game
+from src.player import Player
+
+
+class GameEloChangeStrategy(Protocol):
+    def proccess_game(
+        self,
+        game: Game,
+        current_elo: dict[Player, int],
+    ) -> dict[Player, float]:
+        ...
+
+
+class SimpleEloChangeStrategy(GameEloChangeStrategy):
+    D = 400
+    K = 32
+
+    def proccess_game(
+        self,
+        game: Game,
+        current_elo: dict[Player, int],
+    ) -> dict[Player, float]:
+        players_elo_updates = {player: 0.0 for player in game.scores}
+
+        for player_1, score_1 in game.scores.items():
+            for player_2, score_2 in game.scores.items():
+                if player_1 != player_2:
+                    expected_score = 1 / (
+                        1
+                        + 10
+                        ** ((current_elo[player_2] - current_elo[player_1]) / self.D)
+                    )
+                    result = (
+                        1.0 if score_1 > score_2 else 0.0 if score_1 < score_2 else 0.5
+                    )
+                    players_elo_updates[player_1] += self.K * (result - expected_score)
+
+        return players_elo_updates
-- 
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