feat(multiplayer): support multiplayer events

app/router/room.py

@@ -3,10 +3,14 @@ from __future__ import annotations
 from datetime import UTC, datetime
 from typing import Literal
 
-from app.database.lazer_user import User
+from app.database.beatmap import Beatmap, BeatmapResp
+from app.database.beatmapset import BeatmapsetResp
+from app.database.lazer_user import User, UserResp
+from app.database.multiplayer_event import MultiplayerEvent, MultiplayerEventResp
 from app.database.playlist_attempts import ItemAttemptsCount, ItemAttemptsResp
 from app.database.playlists import Playlist, PlaylistResp
 from app.database.room import Room, RoomBase, RoomResp
+from app.database.score import Score
 from app.dependencies.database import get_db, get_redis
 from app.dependencies.fetcher import get_fetcher
 from app.dependencies.user import get_current_user
@@ -140,7 +144,7 @@ async def add_user_to_room(room: int, user: int, db: AsyncSession = Depends(get_
         resp = await RoomResp.from_hub(server_room)
         await db.refresh(db_room)
         for item in db_room.playlist:
-            resp.playlist.append(await PlaylistResp.from_db(item))
+            resp.playlist.append(await PlaylistResp.from_db(item, ["beatmap"]))
         return resp
     else:
         raise HTTPException(404, "room not found0")
@@ -178,3 +182,115 @@ async def get_room_leaderboard(
         leaderboard=aggs_resp,
         user_score=user_agg,
     )
+
+
+class RoomEvents(BaseModel):
+    beatmaps: list[BeatmapResp] = Field(default_factory=list)
+    beatmapsets: dict[int, BeatmapsetResp] = Field(default_factory=dict)
+    current_playlist_item_id: int = 0
+    events: list[MultiplayerEventResp] = Field(default_factory=list)
+    first_event_id: int = 0
+    last_event_id: int = 0
+    playlist_items: list[PlaylistResp] = Field(default_factory=list)
+    room: RoomResp
+    user: list[UserResp] = Field(default_factory=list)
+
+
+@router.get("/rooms/{room_id}/events", response_model=RoomEvents, tags=["room"])
+async def get_room_events(
+    room_id: int,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+    limit: int = Query(100, ge=1, le=1000),
+    after: int | None = Query(None, ge=0),
+    before: int | None = Query(None, ge=0),
+):
+    events = (
+        await db.exec(
+            select(MultiplayerEvent)
+            .where(
+                MultiplayerEvent.room_id == room_id,
+                col(MultiplayerEvent.id) > after if after is not None else True,
+                col(MultiplayerEvent.id) < before if before is not None else True,
+            )
+            .order_by(col(MultiplayerEvent.id).desc())
+            .limit(limit)
+        )
+    ).all()
+
+    user_ids = set()
+    playlist_items = {}
+    beatmap_ids = set()
+
+    event_resps = []
+    first_event_id = 0
+    last_event_id = 0
+
+    current_playlist_item_id = 0
+    for event in events:
+        event_resps.append(MultiplayerEventResp.from_db(event))
+
+        if event.user_id:
+            user_ids.add(event.user_id)
+
+        if event.playlist_item_id is not None and (
+            playitem := (
+                await db.exec(
+                    select(Playlist).where(
+                        Playlist.id == event.playlist_item_id,
+                        Playlist.room_id == room_id,
+                    )
+                )
+            ).first()
+        ):
+            current_playlist_item_id = playitem.id
+            playlist_items[event.playlist_item_id] = playitem
+            beatmap_ids.add(playitem.beatmap_id)
+            scores = await db.exec(
+                select(Score).where(
+                    Score.playlist_item_id == event.playlist_item_id,
+                    Score.room_id == room_id,
+                )
+            )
+            for score in scores:
+                user_ids.add(score.user_id)
+                beatmap_ids.add(score.beatmap_id)
+
+        assert event.id is not None
+        first_event_id = min(first_event_id, event.id)
+        last_event_id = max(last_event_id, event.id)
+
+    if room := MultiplayerHubs.rooms.get(room_id):
+        current_playlist_item_id = room.queue.current_item.id
+        room_resp = await RoomResp.from_hub(room)
+    else:
+        room = (await db.exec(select(Room).where(Room.id == room_id))).first()
+        if room is None:
+            raise HTTPException(404, "Room not found")
+        room_resp = await RoomResp.from_db(room)
+
+    users = await db.exec(select(User).where(col(User.id).in_(user_ids)))
+    user_resps = [await UserResp.from_db(user, db) for user in users]
+    beatmaps = await db.exec(select(Beatmap).where(col(Beatmap.id).in_(beatmap_ids)))
+    beatmap_resps = [
+        await BeatmapResp.from_db(beatmap, session=db) for beatmap in beatmaps
+    ]
+    beatmapset_resps = {}
+    for beatmap_resp in beatmap_resps:
+        beatmapset_resps[beatmap_resp.beatmapset_id] = beatmap_resp.beatmapset
+
+    playlist_items_resps = [
+        await PlaylistResp.from_db(item) for item in playlist_items.values()
+    ]
+
+    return RoomEvents(
+        beatmaps=beatmap_resps,
+        beatmapsets=beatmapset_resps,
+        current_playlist_item_id=current_playlist_item_id,
+        events=event_resps,
+        first_event_id=first_event_id,
+        last_event_id=last_event_id,
+        playlist_items=playlist_items_resps,
+        room=room_resp,
+        user=user_resps,
+    )