chore(calc): split calculate module

src/arcaea_offline/calculate/b30.py

@@ -0,0 +1,24 @@
+from decimal import Decimal
+from typing import Dict, List
+
+from ..models.scores import ScoreCalculated
+
+
+def get_b30_calculated_list(
+    calculated_list: List[ScoreCalculated],
+) -> List[ScoreCalculated]:
+    best_scores: Dict[str, ScoreCalculated] = {}
+    for calculated in calculated_list:
+        key = f"{calculated.song_id}_{calculated.rating_class}"
+        stored = best_scores.get(key)
+        if stored and stored.score < calculated.score or not stored:
+            best_scores[key] = calculated
+    ret_list = list(best_scores.values())
+    ret_list = sorted(ret_list, key=lambda c: c.potential, reverse=True)[:30]
+    return ret_list
+
+
+def calculate_b30(calculated_list: List[ScoreCalculated]) -> Decimal:
+    ptt_list = [Decimal(c.potential) for c in get_b30_calculated_list(calculated_list)]
+    sum_ptt_list = sum(ptt_list)
+    return (sum_ptt_list / len(ptt_list)) if sum_ptt_list else Decimal("0.0")