from decimal import Decimal
from django.conf import settings
from inventory import models

def calculate_vat(value):
        """Helper to calculate VAT dynamically for a given value."""
        vat_rate = getattr(settings, 'VAT_RATE', Decimal('0.15'))  # Default VAT rate
        return (value * vat_rate).quantize(Decimal('0.01'))
# def get_financial_value(instance,attribute,vat=False):
#     if vat:
#         return calculate_vat(getattr(instance, attribute, Decimal('0.00')) if instance else Decimal('0.00'))
#     return getattr(instance, attribute, Decimal('0.00')) if instance else Decimal('0.00')

def get_financial_value(name,vat=False):
    val = models.AdditionalServices.objects.filter(name=name).first()
    if not val:
        return 0
    if vat:
        return (val.price * settings.VAT_RATE).quantize(Decimal('0.01'))
    return val.price
    
    
def get_total_financials(instance,vat=False):
    # price_after_discount = get_financial_value(instance,"selling_price",vat) - get_financial_value(instance,"discount_amount",vat)
    # subtotal = (
    #     price_after_discount +
    #     get_financial_value("registration_fee") +
    #     get_financial_value("administration_fee",vat) +
    #     get_financial_value("transportation_fee",vat) +
    #     get_financial_value("custom_card_fee",vat))

    return 1000

def get_total(instance):
    total = get_total_financials(instance)
    total_vat = get_total_financials(instance,vat=True)
    return total + total_vat