Update to v2.8.6 without release

- Code refactoring
- Update the song database
- Fix a bug of the friend system which arose in the last version
- Fix a bug of duplicate calculating finishing states when players finish playing the chart in Link Play.

latest version/core/score.py

@@ -0,0 +1,73 @@
+from .song import Chart
+
+
+class Score:
+    def __init__(self) -> None:
+        self.song = Chart()
+        self.score = None
+        self.shiny_perfect_count = None
+        self.perfect_count = None
+        self.near_count = None
+        self.miss_count = None
+        self.health = None
+        self.modifier = None
+        self.time_played = None
+        self.best_clear_type = None
+        self.clear_type = None
+        self.rating = None
+
+    def set_score(self, score: int, shiny_perfect_count: int, perfect_count: int, near_count: int, miss_count: int, health: int, modifier: int, time_played: int, clear_type: int):
+        self.score = score
+        self.shiny_perfect_count = shiny_perfect_count
+        self.perfect_count = perfect_count
+        self.near_count = near_count
+        self.miss_count = miss_count
+        self.health = health
+        self.modifier = modifier
+        self.time_played = time_played
+        self.clear_type = clear_type
+
+    @property
+    def is_valid(self) -> bool:
+        # 分数有效性检查
+        return True
+
+    @staticmethod
+    def calculate_rating(defnum: int, score: int) -> float:
+        # 计算rating，-1视作Unrank
+        if not defnum or defnum <= 0:
+            # 谱面没定数或者定数小于等于0被视作Unrank
+            return -1
+
+        if score >= 10000000:
+            ptt = defnum + 2
+        elif score < 9800000:
+            ptt = defnum + (score-9500000) / 300000
+            if ptt < 0:
+                ptt = 0
+        else:
+            ptt = defnum + 1 + (score-9800000) / 200000
+
+        return ptt
+
+    def get_rating_by_calc(self) -> float:
+        # 通过计算得到本成绩的rating
+        self.rating = self.calculate_rating(self.song.defnum, self.score)
+        return self.rating
+
+    @property
+    def to_dict(self) -> dict:
+        return {
+            "rating": self.rating,
+            "modifier": self.modifier,
+            "time_played": self.time_played,
+            "health": self.health,
+            "clear_type": self.clear_type,
+            "miss_count": self.miss_count,
+            "near_count": self.near_count,
+            "perfect_count": self.perfect_count,
+            "shiny_perfect_count": self.shiny_perfect_count,
+            "score": self.score,
+            "difficulty": self.song.difficulty,
+            "song_id": self.song.song_id
+        }