refactor: external sources update

src/arcaea_offline/external/arcsong/arcsong_db.py

@@ -0,0 +1,37 @@
+import sqlite3
+from typing import List
+
+from sqlalchemy import Engine
+from sqlalchemy.orm import Session
+
+from ...models.songs import ChartInfo
+
+
+class ArcsongDbParser:
+    def __init__(self, filepath):
+        self.filepath = filepath
+
+    def parse(self) -> List[ChartInfo]:
+        results = []
+        with sqlite3.connect(self.filepath) as conn:
+            cursor = conn.cursor()
+            arcsong_db_results = cursor.execute(
+                "SELECT song_id, rating_class, rating, note FROM charts"
+            )
+            for result in arcsong_db_results:
+                chart = ChartInfo(
+                    song_id=result[0],
+                    rating_class=result[1],
+                    constant=result[2],
+                    note=result[3] or None,
+                )
+                results.append(chart)
+
+        return results
+
+    def write_database(self, engine: Engine):
+        with Session(engine) as session:
+            results = self.parse()
+            for result in results:
+                session.merge(result)
+            session.commit()