from uuid import UUID
from fastapi import APIRouter, Depends
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from sqlalchemy.orm import selectinload
from ..database import get_db
from ..models.message import Message
from ..schemas.message import MessageResponse

router = APIRouter(prefix="/api/rooms", tags=["messages"])


@router.get("/{room_id}/messages", response_model=list[MessageResponse])
async def get_messages(
    room_id: UUID,
    limit: int = 50,
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(Message)
        .options(selectinload(Message.user))
        .where(Message.room_id == room_id)
        .order_by(Message.created_at.desc())
        .limit(limit)
    )
    messages = result.scalars().all()

    return [
        MessageResponse(
            id=msg.id,
            room_id=msg.room_id,
            user_id=msg.user_id,
            username=msg.user.username,
            text=msg.text,
            created_at=msg.created_at,
        )
        for msg in reversed(messages)
    ]