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

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

    name = CharField(max_length=255)
    description = TextField(null=True, blank=True)
    service_type = CharField(max_length=255, null=True, blank=True)
    product_groups = ManyToManyField(ProductGroup)

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

class ServicePlan(Model):
    service = OneToOneField(Service, on_delete=CASCADE)

    @classmethod
    def from_productplan(cls, productplan, service):
        plan = cls.objects.create(service=service)

        for item in productplan.serviceplanitem_set:
            ServicePlanItem.objects.create(plan=plan, cycle=item.cycle, count=item.count, cost=item.cost)

class ServicePlanItem(BaseBillable): 
    plan = ForeignKey(ServicePlan, on_delete=CASCADE)