"""Dependency injection for FastAPI."""

from fastapi import Depends, HTTPException, status
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials

from app.config import settings
from app.interfaces.db_api_client import DBApiClient
from app.utils.security import decode_access_token

security = HTTPBearer()


def get_db_client() -> DBApiClient:
    """
    Get DB API client instance.

    Returns:
        DBApiClient configured with api_prefix from settings
    """
    return DBApiClient(api_prefix=settings.DB_API_URL)


async def get_current_user(
    credentials: HTTPAuthorizationCredentials = Depends(security)
) -> dict:
    """
    Get current user from JWT token.

    Args:
        credentials: HTTP Bearer credentials from request

    Returns:
        Token payload with user_id and login

    Raises:
        HTTPException: If token is invalid or expired
    """
    token = credentials.credentials
    payload = decode_access_token(token)

    if payload is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid or expired token",
            headers={"WWW-Authenticate": "Bearer"},
        )

    return payload