feat(playlist): support leaderboard

**UNTESTED**

app/router/room.py

@@ -1,10 +1,10 @@
 from __future__ import annotations
 
 from datetime import UTC, datetime
-from time import timezone
 from typing import Literal
 
 from app.database.lazer_user import User
+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.dependencies.database import get_db, get_redis
@@ -22,10 +22,10 @@ from app.signalr.hub import MultiplayerHubs
 from .api_router import router
 
 from fastapi import Depends, HTTPException, Query
+from pydantic import BaseModel, Field
 from redis.asyncio import Redis
-from sqlmodel import select
+from sqlmodel import col, select
 from sqlmodel.ext.asyncio.session import AsyncSession
-from starlette.status import HTTP_417_EXPECTATION_FAILED
 
 
 @router.get("/rooms", tags=["rooms"], response_model=list[RoomResp])
@@ -144,3 +144,37 @@ async def add_user_to_room(room: int, user: int, db: AsyncSession = Depends(get_
         return resp
     else:
         raise HTTPException(404, "room not found0")
+
+
+class APILeaderboard(BaseModel):
+    leaderboard: list[ItemAttemptsResp] = Field(default_factory=list)
+    user_score: ItemAttemptsResp | None = None
+
+
+@router.get("/rooms/{room}/leaderboard", tags=["room"], response_model=APILeaderboard)
+async def get_room_leaderboard(
+    room: int,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    server_room = MultiplayerHubs.rooms[room]
+    if not server_room:
+        raise HTTPException(404, "Room not found")
+
+    aggs = await db.exec(
+        select(ItemAttemptsCount)
+        .where(ItemAttemptsCount.room_id == room)
+        .order_by(col(ItemAttemptsCount.total_score).desc())
+    )
+    aggs_resp = []
+    user_agg = None
+    for i, agg in enumerate(aggs):
+        resp = await ItemAttemptsResp.from_db(agg, db)
+        resp.position = i + 1
+        aggs_resp.append(resp)
+        if agg.user_id == current_user.id:
+            user_agg = resp
+    return APILeaderboard(
+        leaderboard=aggs_resp,
+        user_score=user_agg,
+    )

app/router/score.py

@@ -1,17 +1,20 @@
 from __future__ import annotations
 
+from datetime import UTC, datetime
 import time
 
 from app.calculator import clamp
 from app.database import (
     Beatmap,
     Playlist,
+    Room,
     Score,
     ScoreResp,
     ScoreToken,
     ScoreTokenResp,
     User,
 )
+from app.database.playlist_attempts import ItemAttemptsCount
 from app.database.playlist_best_score import (
     PlaylistBestScore,
     get_position,
@@ -36,7 +39,6 @@ from app.models.score import (
     Rank,
     SoloScoreSubmissionInfo,
 )
-from app.signalr.hub import MultiplayerHubs
 
 from .api_router import router
 
@@ -278,9 +280,11 @@ async def create_playlist_score(
     current_user: User = Depends(get_current_user),
     session: AsyncSession = Depends(get_db),
 ):
-    room = MultiplayerHubs.rooms[room_id]
+    room = await session.get(Room, room_id)
     if not room:
         raise HTTPException(status_code=404, detail="Room not found")
+    if room.ended_at and room.ended_at < datetime.now(UTC):
+        raise HTTPException(status_code=400, detail="Room has ended")
     item = (
         await session.exec(
             select(Playlist).where(
@@ -301,7 +305,18 @@ async def create_playlist_score(
             raise HTTPException(
                 status_code=400, detail="Beatmap ID mismatch in playlist item"
             )
-    # TODO: max attempts
+    agg = await session.exec(
+        select(ItemAttemptsCount).where(
+            ItemAttemptsCount.room_id == room_id,
+            ItemAttemptsCount.user_id == current_user.id,
+        )
+    )
+    agg = agg.first()
+    if agg and room.max_attempts and agg.attempts >= room.max_attempts:
+        raise HTTPException(
+            status_code=422,
+            detail="You have reached the maximum attempts for this room",
+        )
     if item.expired:
         raise HTTPException(status_code=400, detail="Playlist item has expired")
     if item.played_at:
@@ -342,6 +357,8 @@ async def submit_playlist_score(
     ).first()
     if not item:
         raise HTTPException(status_code=404, detail="Playlist item not found")
+
+    user_id = current_user.id
     score_resp = await submit_score(
         info,
         item.beatmap_id,
@@ -356,12 +373,13 @@ async def submit_playlist_score(
     await process_playlist_best_score(
         room_id,
         playlist_id,
-        current_user.id,
+        user_id,
         score_resp.id,
         score_resp.total_score,
         session,
         redis,
     )
+    await ItemAttemptsCount.get_or_create(room_id, user_id, session)
     return score_resp