from fastapi import Depends, HTTPException, status
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select

from app.core.database import get_db
from app.core.security import decode_token
from app.models.user import User, UserRole

bearer = HTTPBearer()


async def get_current_user(
    credentials: HTTPAuthorizationCredentials = Depends(bearer),
    db: AsyncSession = Depends(get_db),
) -> User:
    user_id = decode_token(credentials.credentials)
    if not user_id:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token")

    result = await db.execute(select(User).where(User.id == user_id))
    user = result.scalar_one_or_none()
    if not user or not user.is_active:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="User not found")
    return user


async def get_approved_user(user: User = Depends(get_current_user)) -> User:
    if user.role == UserRole.PENDING:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Account pending approval")
    return user


async def get_admin_user(user: User = Depends(get_approved_user)) -> User:
    if user.role != UserRole.ADMIN:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Admin access required")
    return user