"""Dependencies for FastAPI"""
import os
from fastapi import HTTPException, Header
from typing import Optional

from vultr_api import VultrClient

VULTR_API_KEY = os.environ.get("VULTR_API_KEY")


def get_client(authorization: Optional[str] = Header(None)) -> VultrClient:
    """
    Get VultrClient instance with API key from Authorization header or environment.

    Supports Vultr API compatible format:
        Authorization: Bearer YOUR_API_KEY
    """
    key = None

    # Parse "Authorization: Bearer API_KEY" header
    if authorization and authorization.startswith("Bearer "):
        key = authorization[7:]  # Remove "Bearer " prefix

    # Fallback to environment variable
    if not key:
        key = VULTR_API_KEY

    if not key:
        raise HTTPException(
            status_code=401,
            detail="API key required. Use 'Authorization: Bearer YOUR_API_KEY' header or set VULTR_API_KEY env var"
        )
    return VultrClient(api_key=key)