"""
Shared dependencies for API Service routes.
Provides JWT-based authentication via get_current_user.
"""

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

from shared.models import get_db, User
from auth_service.app.utils.security import decode_access_token

security = HTTPBearer()


async def get_current_user(
    credentials: HTTPAuthorizationCredentials = Security(security),
    db: AsyncSession = Depends(get_db),
) -> User:
    """Validate JWT and return the current User ORM instance."""
    payload = decode_access_token(credentials.credentials)
    if payload is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid or expired token",
        )

    user_id = payload.get("sub")
    if not user_id:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid token payload",
        )

    result = await db.execute(select(User).where(User.id == user_id))
    user = result.scalar_one_or_none()

    if user is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="User not found",
        )
    if not user.is_active:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="User account is deactivated",
        )

    return user