chore(calc): split calculate module

src/arcaea_offline/calculate/score.py

@@ -0,0 +1,27 @@
+from decimal import Decimal
+from math import floor
+
+
+def calculate_score_range(notes: int, pure: int, far: int):
+    single_note_score = 10000000 / Decimal(notes)
+
+    actual_score = floor(
+        single_note_score * pure + single_note_score * Decimal(0.5) * far
+    )
+    return (actual_score, actual_score + pure)
+
+
+def calculate_potential(_constant: float, score: int) -> Decimal:
+    constant = Decimal(_constant)
+    if score >= 10000000:
+        return constant + 2
+    elif score >= 9800000:
+        return constant + 1 + (Decimal(score - 9800000) / 200000)
+    else:
+        return max(Decimal(0), constant + (Decimal(score - 9500000) / 300000))
+
+
+def calculate_shiny_pure(notes: int, score: int, pure: int, far: int) -> int:
+    single_note_score = 10000000 / Decimal(notes)
+    actual_score = single_note_score * pure + single_note_score * Decimal(0.5) * far
+    return score - floor(actual_score)