implement playlist store

app/store/playlists.py

@@ -0,0 +1,50 @@
+from app.db.userdata import PlaylistTable
+from app.lib.playlistlib import get_first_4_images
+from app.models.playlist import Playlist
+from app.store.tracks import TrackStore
+
+
+class PlaylistEntry:
+    def __init__(self, playlist: Playlist) -> None:
+        self.playlist = playlist
+        self.trackhashes: list[str] = playlist.trackhashes
+        self.playlist.clear_lists()
+
+        if not playlist.has_image:
+            self.playlist.images = get_first_4_images(
+                TrackStore.get_tracks_by_trackhashes(self.trackhashes)
+            )
+
+
+class PlaylistStore:
+    playlistmap: dict[str, PlaylistEntry] = {}
+
+    @classmethod
+    def load_playlists(cls):
+        """
+        Loads all playlists into the store.
+        """
+        cls.playlistmap = {str(p.id): PlaylistEntry(p) for p in PlaylistTable.get_all()}
+        print(cls.playlistmap)
+
+    @classmethod
+    def get_playlist_tracks(cls, playlist_id: str, start: int, limit: int):
+        """
+        Returns the trackhashes for a playlist.
+        """
+
+        entry = cls.playlistmap.get(playlist_id)
+        if entry is None:
+            return []
+
+        return TrackStore.get_tracks_by_trackhashes(
+            entry.trackhashes[start : start + limit]
+        )
+
+    @classmethod
+    def get_flat_list(cls):
+        return [p.playlist for p in cls.playlistmap.values()]
+
+    @classmethod
+    def add_playlist(cls, playlist: Playlist):
+        cls.playlistmap[str(playlist.id)] = PlaylistEntry(playlist)