Code refactoring

- Code refactoring
- Fix a bug that the other player will not become the host of the room at once, when the player disconnect in link play.

> Maybe add many unknown bugs. XD
> The song database `arcsong.db` will not used in the future. You can use a tool in `tool` folder to import old data.

latest version/core/save.py

@@ -0,0 +1,112 @@
+from .util import md5
+from .error import InputError
+from setting import Config
+from time import time
+import json
+
+
+class SaveData:
+
+    def __init__(self, c=None) -> None:
+        self.c = c
+        self.scores_data = []
+        self.clearlamps_data = []
+        self.clearedsongs_data = []
+        self.unlocklist_data = []
+        self.installid_data = ''
+        self.devicemodelname_data = ''
+        self.story_data = []
+        self.createdAt = 0
+
+    @property
+    def to_dict(self):
+        return {
+            "user_id": self.user.user_id,
+            "story": {
+                "": self.story_data
+            },
+            "devicemodelname": {
+                "val": self.devicemodelname_data
+            },
+            "installid":  {
+                "val": self.installid_data
+            },
+            "unlocklist": {
+                "": self.unlocklist_data
+            },
+            "clearedsongs": {
+                "": self.clearedsongs_data
+            },
+            "clearlamps": {
+                "": self.clearlamps_data
+            },
+            "scores": {
+                "": self.scores_data
+            },
+            "version": {
+                "val": 1
+            },
+            "createdAt": self.createdAt
+        }
+
+    def select_all(self, user) -> None:
+        '''
+            parameter: `user` - `User`类或子类的实例
+        '''
+        self.user = user
+        self.c.execute('''select * from user_save where user_id=:a''',
+                       {'a': user.user_id})
+        x = self.c.fetchone()
+        if x:
+            self.scores_data = json.loads(x[1])[""]
+            self.clearlamps_data = json.loads(x[2])[""]
+            self.clearedsongs_data = json.loads(x[3])[""]
+            self.unlocklist_data = json.loads(x[4])[""]
+            self.installid_data = json.loads(x[5])["val"]
+            self.devicemodelname_data = json.loads(x[6])["val"]
+            self.story_data = json.loads(x[7])[""]
+            if x[8] is not None:
+                self.createdAt = int(x[8])
+
+        if Config.SAVE_FULL_UNLOCK:
+            self.installid_data = "0fcec8ed-7b62-48e2-9d61-55041a22b123"  # 使得可以进入存档选择上传或下载界面
+            for i in self.story_data:
+                i['c'] = True
+                i['r'] = True
+            for i in self.unlocklist_data:
+                if i['unlock_key'][-3:] == '101':
+                    i['complete'] = 100
+                elif i['unlock_key'][:16] == 'aegleseeker|2|3|':
+                    i['complete'] = 10
+                elif i['unlock_key'] == 'saikyostronger|2|3|einherjar|2':
+                    i['complete'] = 6
+                elif i['unlock_key'] == 'saikyostronger|2|3|laqryma|2':
+                    i['complete'] = 3
+                else:
+                    i['complete'] = 1
+
+    def update_all(self, user) -> None:
+        '''
+            parameter: `user` - `User`类或子类的实例
+        '''
+        self.createdAt = int(time() * 1000)
+        self.c.execute('''delete from user_save where user_id=:a''', {
+                       'a': user.user_id})
+        self.c.execute('''insert into user_save values(:a,:b,:c,:d,:e,:f,:g,:h,:i)''', {
+            'a': user.user_id, 'b': json.dumps({'': self.scores_data}), 'c': json.dumps({'': self.clearlamps_data}), 'd': json.dumps({'': self.clearedsongs_data}), 'e': json.dumps({'': self.unlocklist_data}), 'f': json.dumps({'val': self.installid_data}), 'g': json.dumps({'val': self.devicemodelname_data}), 'h': json.dumps({'': self.story_data}), 'i': self.createdAt})
+
+    def set_value(self, key: str, value: str, checksum: str) -> None:
+        '''
+            从Arcaea客户端给的奇怪字符串中获取存档数据，并进行数据校验
+        '''
+        if key not in self.__dict__:
+            raise KeyError(
+                'Property `%s` is not found in the instance of `SaveData` class.' % key)
+
+        if md5(value) == checksum:
+            if key == 'installid_data' or key == 'devicemodelname_data':
+                self.__dict__[key] = json.loads(value)['val']
+            else:
+                self.__dict__[key] = json.loads(value)['']
+        else:
+            raise InputError('Hash value of cloud save data mismatches.')