from app.config import settings
import requests
from app.utils.logger import logger

def get_headers():
    BANK_CALL_BASE_URL = settings.BANK_CALL_BASE_URL
    BANK_CALL_AUTH_ENDPOINT = settings.BANK_CALL_AUTH_ENDPOINT
    BANK_CALL_BASIC_AUTH_USERNAME = settings.BANK_CALL_BASIC_AUTH_USERNAME
    BANK_CALL_BASIC_AUTH_PASSWORD = settings.BANK_CALL_BASIC_AUTH_PASSWORD
    BANK_GRANT_TYPE = settings.BANK_GRANT_TYPE
    #authenticate
    url = f"{BANK_CALL_BASE_URL}{BANK_CALL_AUTH_ENDPOINT}"
    data = {
        "grant_type": BANK_GRANT_TYPE,
        "username": BANK_CALL_BASIC_AUTH_USERNAME,
        "password":  "G7$k9@pL2!qR"
    }
    logger.info(f"Calling Bank Call-Auth Endpoint: {url}")
    
    headers = {"Content-Type": "application/json"}

    try:
        response = requests.post(url, json=data, headers=headers,  timeout=10)
        response.raise_for_status()  # Raises HTTPError for 4xx/5xx
        result = response.json()
        

        # Check if access_token is present
        if 'access_token' not in result:
            logger.error("No access_token found in Bank Call Auth response")
            return {"error": "Authentication failed: no access_token returned"}

        return {
            "Content-Type": "application/json",
            "x-api-key": settings.BANK_CALL_API_KEY,
            "App-Id": settings.BANK_CALL_APP_ID,
            "Authorization": f"Bearer {result['access_token']}" 
        }

    except requests.exceptions.RequestException as e:
        logger.error(f"Failed to get auth token: {e}")
        raise
    except ValueError as e:
        logger.error(f"Failed to parse auth response JSON: {e}")
        raise