from core.fields.numbers import CostField
from core.models.local import Currency
from core.models.profiles import ClientProfile

from django.db.models import Model, TextField, CharField, ManyToManyField, ForeignKey, CASCADE, PositiveIntegerField, OneToOneField, BooleanField, SET_NULL

from importlib import import_module
from logging import getLogger

logger = getLogger(__name__)


class Service(Model):
    from core.models.products import ProductGroup, Product
    from core.models.billable import CycleChoices

    client = ForeignKey(ClientProfile, on_delete=CASCADE)
    name = CharField(max_length=255)
    description = TextField(null=True, blank=True)
    service_type = CharField(max_length=255, null=True, blank=True)
    product = ForeignKey(Product, on_delete=SET_NULL, null=True)
    product_groups = ManyToManyField(ProductGroup)
    currency = ForeignKey(Currency, on_delete=CASCADE)
    cycle = PositiveIntegerField(choices=CycleChoices.choices)
    count = PositiveIntegerField()
    cost = CostField()
    setup = CostField()
    taxable=BooleanField()

    @property
    def handler(self):
        if self.service_type and self.product:
            try:
                service_type = import_module(self.service_type)
                return service_type.ProductRouter(self.product, self)
            except Exception as e:
                logger.error(
                    f"Could not load product handler {self.service_type} for product {self.id}: {e}")
        return None

    @classmethod
    def from_productplan(cls, productplan, client):
        cls.objects.create(client=client,
                            name=productplan.product.name, 
                            description=productplan.product.description, 
                            service_type=productplan.product.product_type, 
                            product=productplan.product,
                            product_groups=productplan.product.product_groups, 
                            currency=productplan.currency, 
                            cycle=productplan.cycle, 
                            count=productplan.count, 
                            cost=productplan.cost, 
                            taxable=productplan.taxable)

    @property
    def invoicable(self):
        pass