feat(score): support calculate pp

app/models/mods.py

@@ -105,3 +105,65 @@ def mods_to_int(mods: list[APIMod]) -> int:
     for mod in mods:
         sum_ |= API_MOD_TO_LEGACY.get(mod["acronym"], 0)
     return sum_
+
+
+NO_CHECK = "DO_NO_CHECK"
+
+# FIXME: 这里为空表示了两种情况：mod 没有配置项；任何时候都可以获得 pp
+# 如果是后者，则 mod 更新的时候可能会误判。
+COMMON_CONFIG: dict[str, dict] = {
+    "EZ": {"retries": 2},
+    "NF": {},
+    "HT": {"speed_change": 0.75, "adjust_pitch": NO_CHECK},
+    "DC": {"speed_change": 0.75},
+    "HR": {},
+    "SD": {},
+    "PF": {},
+    "HD": {},
+    "DT": {"speed_change": 1.5, "adjust_pitch": NO_CHECK},
+    "NC": {"speed_change": 1.5},
+    "FL": {"size_multiplier": 1.0, "combo_based_size": True},
+    "AC": {},
+    "MU": {},
+    "TD": {},
+}
+
+RANKED_MODS: dict[int, dict[str, dict]] = {
+    0: COMMON_CONFIG,
+    1: COMMON_CONFIG,
+    2: COMMON_CONFIG,
+    3: COMMON_CONFIG,
+}
+# osu
+RANKED_MODS[0]["HD"]["only_fade_approach_circles"] = False
+RANKED_MODS[0]["FL"]["follow_delay"] = 1.0
+RANKED_MODS[0]["BL"] = {}
+RANKED_MODS[0]["NS"] = {}
+RANKED_MODS[0]["SO"] = {}
+RANKED_MODS[0]["TC"] = {}
+# taiko
+del RANKED_MODS[1]["EZ"]["retries"]
+# catch
+RANKED_MODS[2]["NS"] = {}
+# mania
+del RANKED_MODS[3]["HR"]
+RANKED_MODS[3]["FL"]["combo_based_size"] = False
+RANKED_MODS[3]["MR"] = {}
+for i in range(4, 10):
+    RANKED_MODS[3][f"{i}K"] = {}
+
+
+def mods_can_get_pp(ruleset_id: int, mods: list[APIMod]) -> bool:
+    ranked_mods = RANKED_MODS[ruleset_id]
+    for mod in mods:
+        mod["settings"] = mod.get("settings", {})
+        if (settings := ranked_mods.get(mod["acronym"])) is None:
+            return False
+        if settings == {}:
+            continue
+        for setting, value in mod["settings"].items():
+            if (expected_value := settings.get(setting)) is None:
+                return False
+            if expected_value != NO_CHECK and value != expected_value:
+                return False
+    return True