"""Interface to the ows-contracts microservice."""
from oto import response
from owsrequest import request

from backend.constants import error
from backend.constants import services


def is_mech_admin(account_type, account_id):
    """Check whether user with provided Grass credentials is mechadmin.

    ows-contracts returns 200 if user is mechadmin, 204 if not.

    Args:
        account_type (str): Grass-Account-Type header
        account_id (str): Grass-Account-Id header

    Returns:
        oto.response.Response
    """
    mech_admin_url = '/{0}/{1}/mechadmin'.format(account_type, account_id)
    contracts_response = request.head(services.OWS_CONTRACTS, mech_admin_url)

    if contracts_response.status_code not in [200, 204]:
        try:
            errors_data = contracts_response.json()
        except Exception:
            errors_data = {
                'code': error.OWS_CONTRACTS_ERROR_CODE,
                'message': contracts_response.content.decode()
            }
        return response.create_error_response(
            status=contracts_response.status_code, **errors_data)

    mech_admin_status_codes = {200: True, 204: False}
    result = mech_admin_status_codes[contracts_response.status_code]

    return response.Response(message={'is_mech_admin': result})