"""Vendor Contract logic tier."""

from ows_accounting import response
from ows_accounting.constants import error
from ows_accounting.models import currency
from ows_accounting.models import ows_contracts


def get_currency_by_vendor_id(account):
    """Get currency for a vendor id.

    Args:
        account (GrassAccount): GrassAccount named tuple
        with params type and id.
    Returns:
        Response object: Response object
            with the vendor's currency
    """
    vendor_contracts = ows_contracts.get_booked_contracts(
        account_type=account.type,
        account_id=account.id,
        sort_order='desc')

    if not vendor_contracts:
        return response.create_not_found_response(
                    error.ERROR_MESSAGE_CONTRACTS_NOT_FOUND)

    latest_contract = vendor_contracts.message['items'][0]
    vendor_currency_response = currency.get_currency_by_id(
        latest_contract['currency_id'])

    if not vendor_currency_response:
        return response.create_not_found_response(
                    error.ERROR_MESSAGE_CURRENCY_NOT_FOUND)

    vendor_currency = vendor_currency_response.message.copy()

    vendor_currency.update({
        'vendor_id': latest_contract['vendor_id'],
        'currency_id': vendor_currency['id']})

    del vendor_currency['id']

    return response.Response(vendor_currency)