from fastapi import APIRouter, Depends
from sqlalchemy.ext.asyncio import AsyncSession

from app.auth.service import get_current_user
from app.chats.schemas import ChatCreateRequest, ChatDetailRead, ChatRead
from app.chats.service import create_chat_for_user, get_chat_for_user, get_chats_for_user
from app.database.session import get_db
from app.users.models import User

router = APIRouter(prefix="/chats", tags=["chats"])


@router.get("", response_model=list[ChatRead])
async def list_chats(
    limit: int = 50,
    before_id: int | None = None,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
) -> list[ChatRead]:
    return await get_chats_for_user(db, user_id=current_user.id, limit=limit, before_id=before_id)


@router.post("", response_model=ChatRead)
async def create_chat(
    payload: ChatCreateRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
) -> ChatRead:
    return await create_chat_for_user(db, creator_id=current_user.id, payload=payload)


@router.get("/{chat_id}", response_model=ChatDetailRead)
async def get_chat(
    chat_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
) -> ChatDetailRead:
    chat, members = await get_chat_for_user(db, chat_id=chat_id, user_id=current_user.id)
    return ChatDetailRead(
        id=chat.id,
        type=chat.type,
        title=chat.title,
        created_at=chat.created_at,
        members=members,
    )