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 core.mixins.billable import RecurMixin

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(RecurMixin, BaseBillable): 
    plan = ForeignKey(ServicePlan, on_delete=CASCADE)