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):
    total = 0
    if instance.additional_services.count() != 0:
        total = sum(x.price for x in instance.additional_services) + instance.selling_price
    if vat:
        total = (total * settings.VAT_RATE).quantize(Decimal('0.01')) + total
    return total
    
def get_total(instance):
    total = get_total_financials(instance,vat=True)    
    return total