feat(multiplayer): support add/edit/remove playlist item

app/database/playlists.py

@@ -16,7 +16,10 @@ from sqlmodel import (
     ForeignKey,
     Relationship,
     SQLModel,
+    func,
+    select,
 )
+from sqlmodel.ext.asyncio.session import AsyncSession
 
 if TYPE_CHECKING:
     from .room import Room
@@ -59,9 +62,20 @@ class Playlist(PlaylistBase, table=True):
     room: "Room" = Relationship()
 
     @classmethod
-    async def from_hub(cls, playlist: PlaylistItem, room_id: int) -> "Playlist":
+    async def get_next_id_for_room(cls, room_id: int, session: AsyncSession) -> int:
+        stmt = select(func.coalesce(func.max(cls.id), -1) + 1).where(
+            cls.room_id == room_id
+        )
+        result = await session.exec(stmt)
+        return result.one()
+
+    @classmethod
+    async def from_hub(
+        cls, playlist: PlaylistItem, room_id: int, session: AsyncSession
+    ) -> "Playlist":
+        next_id = await cls.get_next_id_for_room(room_id, session=session)
         return cls(
-            id=playlist.id,
+            id=next_id,
             owner_id=playlist.owner_id,
             ruleset_id=playlist.ruleset_id,
             beatmap_id=playlist.beatmap_id,
@@ -74,6 +88,50 @@ class Playlist(PlaylistBase, table=True):
             room_id=room_id,
         )
 
+    @classmethod
+    async def update(cls, playlist: PlaylistItem, room_id: int, session: AsyncSession):
+        db_playlist = await session.exec(
+            select(cls).where(cls.id == playlist.id, cls.room_id == room_id)
+        )
+        db_playlist = db_playlist.first()
+        if db_playlist is None:
+            raise ValueError("Playlist item not found")
+        db_playlist.owner_id = playlist.owner_id
+        db_playlist.ruleset_id = playlist.ruleset_id
+        db_playlist.beatmap_id = playlist.beatmap_id
+        db_playlist.required_mods = [
+            msgpack_to_apimod(mod) for mod in playlist.required_mods
+        ]
+        db_playlist.allowed_mods = [
+            msgpack_to_apimod(mod) for mod in playlist.allowed_mods
+        ]
+        db_playlist.expired = playlist.expired
+        db_playlist.playlist_order = playlist.order
+        db_playlist.played_at = playlist.played_at
+        db_playlist.freestyle = playlist.freestyle
+        await session.commit()
+
+    @classmethod
+    async def add_to_db(
+        cls, playlist: PlaylistItem, room_id: int, session: AsyncSession
+    ):
+        db_playlist = await cls.from_hub(playlist, room_id, session)
+        session.add(db_playlist)
+        await session.commit()
+        await session.refresh(db_playlist)
+        playlist.id = db_playlist.id
+
+    @classmethod
+    async def delete_item(cls, item_id: int, room_id: int, session: AsyncSession):
+        db_playlist = await session.exec(
+            select(cls).where(cls.id == item_id, cls.room_id == room_id)
+        )
+        db_playlist = db_playlist.first()
+        if db_playlist is None:
+            raise ValueError("Playlist item not found")
+        await session.delete(db_playlist)
+        await session.commit()
+
 
 class PlaylistResp(PlaylistBase):
     beatmap: BeatmapResp | None = None

app/models/multiplayer_hub.py

@@ -1,7 +1,12 @@
 from __future__ import annotations
 
+from dataclasses import dataclass
 import datetime
-from typing import Annotated, Any, Literal
+from typing import TYPE_CHECKING, Annotated, Any, Literal
+
+from app.database.beatmap import Beatmap
+from app.dependencies.database import engine
+from app.exception import InvokeException
 
 from .room import (
     DownloadState,
@@ -21,7 +26,14 @@ from .signalr import (
 )
 
 from msgpack_lazer_api import APIMod
-from pydantic import BaseModel, Field, field_serializer, field_validator
+from pydantic import Field, field_serializer, field_validator
+from sqlmodel.ext.asyncio.session import AsyncSession
+
+if TYPE_CHECKING:
+    from app.signalr.hub import MultiplayerHub
+
+HOST_LIMIT = 50
+PER_USER_LIMIT = 3
 
 
 class MultiplayerClientState(UserState):
@@ -161,8 +173,246 @@ class MultiplayerRoom(MessagePackArrayModel):
         return msgpack_union_dump(v)
 
 
-class ServerMultiplayerRoom(BaseModel):
+class MultiplayerQueue:
+    def __init__(self, room: "ServerMultiplayerRoom", hub: "MultiplayerHub"):
+        self.server_room = room
+        self.hub = hub
+        self.current_index = 0
+
+    @property
+    def upcoming_items(self):
+        return sorted(
+            (item for item in self.room.playlist if not item.expired),
+            key=lambda i: i.order,
+        )
+
+    @property
+    def room(self):
+        return self.server_room.room
+
+    async def update_order(self):
+        from app.database import Playlist
+
+        match self.room.settings.queue_mode:
+            case QueueMode.ALL_PLAYERS_ROUND_ROBIN:
+                ordered_active_items = []
+
+                is_first_set = True
+                first_set_order_by_user_id = {}
+
+                active_items = [item for item in self.room.playlist if not item.expired]
+                active_items.sort(key=lambda x: x.id)
+
+                user_item_groups = {}
+                for item in active_items:
+                    if item.owner_id not in user_item_groups:
+                        user_item_groups[item.owner_id] = []
+                    user_item_groups[item.owner_id].append(item)
+
+                max_items = max(
+                    (len(items) for items in user_item_groups.values()), default=0
+                )
+
+                for i in range(max_items):
+                    current_set = []
+                    for user_id, items in user_item_groups.items():
+                        if i < len(items):
+                            current_set.append(items[i])
+
+                    if is_first_set:
+                        current_set.sort(key=lambda item: (item.order, item.id))
+                        ordered_active_items.extend(current_set)
+                        first_set_order_by_user_id = {
+                            item.owner_id: idx
+                            for idx, item in enumerate(ordered_active_items)
+                        }
+                    else:
+                        current_set.sort(
+                            key=lambda item: first_set_order_by_user_id.get(
+                                item.owner_id, 0
+                            )
+                        )
+                        ordered_active_items.extend(current_set)
+
+                    is_first_set = False
+
+                for idx, item in enumerate(ordered_active_items):
+                    item.order = idx
+            case _:
+                ordered_active_items = sorted(
+                    (item for item in self.room.playlist if not item.expired),
+                    key=lambda x: x.id,
+                )
+        async with AsyncSession(engine) as session:
+            for idx, item in enumerate(ordered_active_items):
+                if item.order == idx:
+                    continue
+                item.order = idx
+                await Playlist.update(item, self.room.room_id, session)
+                await self.hub.playlist_changed(
+                    self.server_room, item, beatmap_changed=False
+                )
+
+    async def update_current_item(self):
+        upcoming_items = self.upcoming_items
+        next_item = (
+            upcoming_items[0]
+            if upcoming_items
+            else max(
+                self.room.playlist,
+                key=lambda i: i.played_at or datetime.datetime.min,
+            )
+        )
+        self.current_index = self.room.playlist.index(next_item)
+        last_id = self.room.settings.playlist_item_id
+        self.room.settings.playlist_item_id = next_item.id
+        if last_id != next_item.id:
+            await self.hub.setting_changed(self.server_room, True)
+
+    async def add_item(self, item: PlaylistItem, user: MultiplayerRoomUser):
+        from app.database import Playlist
+
+        is_host = self.room.host and self.room.host.user_id == user.user_id
+        if self.room.settings.queue_mode == QueueMode.HOST_ONLY and not is_host:
+            raise InvokeException("You are not the host")
+
+        limit = HOST_LIMIT if is_host else PER_USER_LIMIT
+        if (
+            len(
+                list(
+                    filter(
+                        lambda x: x.owner_id == user.user_id,
+                        self.room.playlist,
+                    )
+                )
+            )
+            >= limit
+        ):
+            raise InvokeException(f"You can only have {limit} items in the queue")
+
+        if item.freestyle and len(item.allowed_mods) > 0:
+            raise InvokeException("Freestyle items cannot have allowed mods")
+
+        async with AsyncSession(engine) as session:
+            async with session:
+                beatmap = await session.get(Beatmap, item.beatmap_id)
+                if beatmap is None:
+                    raise InvokeException("Beatmap not found")
+                if item.checksum != beatmap.checksum:
+                    raise InvokeException("Checksum mismatch")
+                # TODO: mods validation
+                item.owner_id = user.user_id
+                item.star = float(
+                    beatmap.difficulty_rating
+                )  # FIXME: beatmap use decimal
+                await Playlist.add_to_db(item, self.room.room_id, session)
+                self.room.playlist.append(item)
+        await self.hub.playlist_added(self.server_room, item)
+        await self.update_order()
+        await self.update_current_item()
+
+    async def edit_item(self, item: PlaylistItem, user: MultiplayerRoomUser):
+        from app.database import Playlist
+
+        if item.freestyle and len(item.allowed_mods) > 0:
+            raise InvokeException("Freestyle items cannot have allowed mods")
+
+        async with AsyncSession(engine) as session:
+            async with session:
+                beatmap = await session.get(Beatmap, item.beatmap_id)
+                if beatmap is None:
+                    raise InvokeException("Beatmap not found")
+                if item.checksum != beatmap.checksum:
+                    raise InvokeException("Checksum mismatch")
+
+                existing_item = next(
+                    (i for i in self.room.playlist if i.id == item.id), None
+                )
+                if existing_item is None:
+                    raise InvokeException(
+                        "Attempted to change an item that doesn't exist"
+                    )
+
+                if existing_item.owner_id != user.user_id and self.room.host != user:
+                    raise InvokeException(
+                        "Attempted to change an item which is not owned by the user"
+                    )
+
+                if existing_item.expired:
+                    raise InvokeException(
+                        "Attempted to change an item which has already been played"
+                    )
+
+                # TODO: mods validation
+                item.owner_id = user.user_id
+                item.star = float(beatmap.difficulty_rating)
+                item.order = existing_item.order
+
+                await Playlist.update(item, self.room.room_id, session)
+
+                # Update item in playlist
+                for idx, playlist_item in enumerate(self.room.playlist):
+                    if playlist_item.id == item.id:
+                        self.room.playlist[idx] = item
+                        break
+
+                await self.hub.playlist_changed(
+                    self.server_room,
+                    item,
+                    beatmap_changed=item.checksum != existing_item.checksum,
+                )
+
+    async def remove_item(self, playlist_item_id: int, user: MultiplayerRoomUser):
+        from app.database import Playlist
+
+        item = next(
+            (i for i in self.room.playlist if i.id == playlist_item_id),
+            None,
+        )
+
+        if item is None:
+            raise InvokeException("Item does not exist in the room")
+
+        # Check if it's the only item and current item
+        if item == self.current_item:
+            upcoming_items = [i for i in self.room.playlist if not i.expired]
+            if len(upcoming_items) == 1:
+                raise InvokeException("The only item in the room cannot be removed")
+
+        if item.owner_id != user.user_id and self.room.host != user:
+            raise InvokeException(
+                "Attempted to remove an item which is not owned by the user"
+            )
+
+        if item.expired:
+            raise InvokeException(
+                "Attempted to remove an item which has already been played"
+            )
+
+        async with AsyncSession(engine) as session:
+            await Playlist.delete_item(item.id, self.room.room_id, session)
+
+        self.room.playlist.remove(item)
+        self.current_index = self.room.playlist.index(self.upcoming_items[0])
+
+        await self.update_order()
+        await self.update_current_item()
+        await self.hub.playlist_removed(self.server_room, item.id)
+
+    @property
+    def current_item(self):
+        """Get the current playlist item"""
+        current_id = self.room.settings.playlist_item_id
+        return next(
+            (item for item in self.room.playlist if item.id == current_id),
+            None,
+        )
+
+
+@dataclass
+class ServerMultiplayerRoom:
     room: MultiplayerRoom
     category: RoomCategory
     status: RoomStatus
     start_at: datetime.datetime
+    queue: MultiplayerQueue | None = None

app/signalr/hub/hub.py

@@ -6,9 +6,9 @@ import time
 from typing import Any
 
 from app.config import settings
+from app.exception import InvokeException
 from app.log import logger
 from app.models.signalr import UserState
-from app.signalr.exception import InvokeException
 from app.signalr.packet import (
     ClosePacket,
     CompletionPacket,

app/signalr/hub/multiplayer.py

@@ -5,16 +5,19 @@ from typing import override
 from app.database import Room
 from app.database.playlists import Playlist
 from app.dependencies.database import engine
+from app.exception import InvokeException
 from app.log import logger
 from app.models.multiplayer_hub import (
+    BeatmapAvailability,
     MultiplayerClientState,
+    MultiplayerQueue,
     MultiplayerRoom,
     MultiplayerRoomUser,
+    PlaylistItem,
     ServerMultiplayerRoom,
 )
 from app.models.room import RoomCategory, RoomStatus
 from app.models.signalr import serialize_to_list
-from app.signalr.exception import InvokeException
 
 from .hub import Client, Hub
 
@@ -40,6 +43,9 @@ class MultiplayerHub(Hub[MultiplayerClientState]):
 
     async def CreateRoom(self, client: Client, room: MultiplayerRoom):
         logger.info(f"[MultiplayerHub] {client.user_id} creating room")
+        store = self.get_or_create_state(client)
+        if store.room_id != 0:
+            raise InvokeException("You are already in a room")
         async with AsyncSession(engine) as session:
             async with session:
                 db_room = Room(
@@ -55,22 +61,22 @@ class MultiplayerHub(Hub[MultiplayerClientState]):
                 session.add(db_room)
                 await session.commit()
                 await session.refresh(db_room)
-                playitem = room.playlist[0]
-                playitem.owner_id = client.user_id
-                playitem.order = 1
-                db_playlist = await Playlist.from_hub(playitem, db_room.id)
-                session.add(db_playlist)
+                item = room.playlist[0]
+                item.owner_id = client.user_id
                 room.room_id = db_room.id
                 starts_at = db_room.starts_at
-                await session.commit()
-                await session.refresh(db_playlist)
-                # room.playlist.append()
+                await Playlist.add_to_db(item, db_room.id, session)
                 server_room = ServerMultiplayerRoom(
                     room=room,
                     category=RoomCategory.NORMAL,
                     status=RoomStatus.IDLE,
                     start_at=starts_at,
                 )
+                queue = MultiplayerQueue(
+                    room=server_room,
+                    hub=self,
+                )
+                server_room.queue = queue
                 self.rooms[room.room_id] = server_room
                 return await self.JoinRoomWithPassword(
                     client, room.room_id, room.settings.password
@@ -101,3 +107,115 @@ class MultiplayerHub(Hub[MultiplayerClientState]):
         room.users.append(user)
         self.add_to_group(client, self.group_id(room_id))
         return serialize_to_list(room)
+
+    async def ChangeBeatmapAvailability(
+        self, client: Client, beatmap_availability: BeatmapAvailability
+    ):
+        store = self.get_or_create_state(client)
+        if store.room_id == 0:
+            raise InvokeException("You are not in a room")
+        if store.room_id not in self.rooms:
+            raise InvokeException("Room does not exist")
+        server_room = self.rooms[store.room_id]
+        room = server_room.room
+        user = next((u for u in room.users if u.user_id == client.user_id), None)
+        if user is None:
+            raise InvokeException("You are not in this room")
+
+        availability = user.availability
+        if (
+            availability.state == beatmap_availability.state
+            and availability.progress == beatmap_availability.progress
+        ):
+            return
+        user.availability = availability
+        await self.broadcast_group_call(
+            self.group_id(store.room_id),
+            "UserBeatmapAvailabilityChanged",
+            user.user_id,
+            serialize_to_list(beatmap_availability),
+        )
+
+    async def AddPlaylistItem(self, client: Client, item: PlaylistItem):
+        store = self.get_or_create_state(client)
+        if store.room_id == 0:
+            raise InvokeException("You are not in a room")
+        if store.room_id not in self.rooms:
+            raise InvokeException("Room does not exist")
+        server_room = self.rooms[store.room_id]
+        room = server_room.room
+        assert server_room.queue
+        user = next((u for u in room.users if u.user_id == client.user_id), None)
+        if user is None:
+            raise InvokeException("You are not in this room")
+
+        await server_room.queue.add_item(
+            item,
+            user,
+        )
+
+    async def EditPlaylistItem(self, client: Client, item: PlaylistItem):
+        store = self.get_or_create_state(client)
+        if store.room_id == 0:
+            raise InvokeException("You are not in a room")
+        if store.room_id not in self.rooms:
+            raise InvokeException("Room does not exist")
+        server_room = self.rooms[store.room_id]
+        room = server_room.room
+        assert server_room.queue
+        user = next((u for u in room.users if u.user_id == client.user_id), None)
+        if user is None:
+            raise InvokeException("You are not in this room")
+
+        await server_room.queue.edit_item(
+            item,
+            user,
+        )
+
+    async def RemovePlaylistItem(self, client: Client, item_id: int):
+        store = self.get_or_create_state(client)
+        if store.room_id == 0:
+            raise InvokeException("You are not in a room")
+        if store.room_id not in self.rooms:
+            raise InvokeException("Room does not exist")
+        server_room = self.rooms[store.room_id]
+        room = server_room.room
+        assert server_room.queue
+        user = next((u for u in room.users if u.user_id == client.user_id), None)
+        if user is None:
+            raise InvokeException("You are not in this room")
+
+        await server_room.queue.remove_item(
+            item_id,
+            user,
+        )
+
+    async def setting_changed(self, room: ServerMultiplayerRoom, beatmap_changed: bool):
+        await self.broadcast_group_call(
+            self.group_id(room.room.room_id),
+            "SettingsChanged",
+            serialize_to_list(room.room.settings),
+        )
+
+    async def playlist_added(self, room: ServerMultiplayerRoom, item: PlaylistItem):
+        await self.broadcast_group_call(
+            self.group_id(room.room.room_id),
+            "PlaylistItemAdded",
+            serialize_to_list(item),
+        )
+
+    async def playlist_removed(self, room: ServerMultiplayerRoom, item_id: int):
+        await self.broadcast_group_call(
+            self.group_id(room.room.room_id),
+            "PlaylistItemRemoved",
+            item_id,
+        )
+
+    async def playlist_changed(
+        self, room: ServerMultiplayerRoom, item: PlaylistItem, beatmap_changed: bool
+    ):
+        await self.broadcast_group_call(
+            self.group_id(room.room.room_id),
+            "PlaylistItemChanged",
+            serialize_to_list(item),
+        )