from decimal import Decimal
from django.conf import settings
from django_ledger.models.items import ItemModel


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 = ItemModel.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_additional_services = sum(
            x.price for x in instance.additional_services.all()
        )
        total = instance.selling_price + total_additional_services
    if vat and total:
        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