import decimal import sys from django.db import models from django.db.models import F, Q from django.db.models.signals import pre_delete, post_delete, post_save from django.dispatch import receiver from django.contrib.contenttypes import generic from django.contrib.contenttypes.models import ContentType from django.core.validators import ValidationError from django.utils import timezone from django.utils.functional import cached_property from django.utils.translation import ugettext_lazy as _ from orchestra.core import caches, services, accounts from orchestra.models import queryset from orchestra.utils.apps import autodiscover from orchestra.utils.python import import_class from . import helpers, settings, rating from .handlers import ServiceHandler class Plan(models.Model): name = models.CharField(_("plan"), max_length=128) is_default = models.BooleanField(_("is default"), default=False) is_combinable = models.BooleanField(_("is combinable"), default=True) allow_multiple = models.BooleanField(_("allow multipls"), default=False) def __unicode__(self): return self.name class ContractedPlan(models.Model): plan = models.ForeignKey(Plan, verbose_name=_("plan"), related_name='contracts') account = models.ForeignKey('accounts.Account', verbose_name=_("account"), related_name='plans') def __unicode__(self): return str(self.plan) def clean(self): if not self.pk and not self.plan.allow_multipls: if ContractedPlan.objects.filter(plan=self.plan, account=self.account).exists(): raise ValidationError("A contracted plan for this account already exists") class RateQuerySet(models.QuerySet): group_by = queryset.group_by def by_account(self, account): # Default allways selected return self.filter( Q(plan__is_default=True) | Q(plan__contracts__account=account) ).order_by('plan', 'quantity').select_related('plan') class Rate(models.Model): service = models.ForeignKey('services.Service', verbose_name=_("service"), related_name='rates') plan = models.ForeignKey(Plan, verbose_name=_("plan"), related_name='rates') quantity = models.PositiveIntegerField(_("quantity"), null=True, blank=True) price = models.DecimalField(_("price"), max_digits=12, decimal_places=2) objects = RateQuerySet.as_manager() class Meta: unique_together = ('service', 'plan', 'quantity') def __unicode__(self): return "{}-{}".format(str(self.price), self.quantity) autodiscover('handlers') class Service(models.Model): NEVER = '' MONTHLY = 'MONTHLY' ANUAL = 'ANUAL' TEN_DAYS = 'TEN_DAYS' ONE_MONTH = 'ONE_MONTH' ALWAYS = 'ALWAYS' ON_REGISTER = 'ON_REGISTER' FIXED_DATE = 'ON_FIXED_DATE' BILLING_PERIOD = 'BILLING_PERIOD' REGISTER_OR_RENEW = 'REGISTER_OR_RENEW' CONCURRENT = 'CONCURRENT' NOTHING = 'NOTHING' DISCOUNT = 'DISCOUNT' REFOUND = 'REFOUND' PREPAY = 'PREPAY' POSTPAY = 'POSTPAY' STEP_PRICE = 'STEP_PRICE' MATCH_PRICE = 'MATCH_PRICE' RATE_METHODS = { STEP_PRICE: rating.step_price, MATCH_PRICE: rating.match_price, } description = models.CharField(_("description"), max_length=256, unique=True) content_type = models.ForeignKey(ContentType, verbose_name=_("content type")) match = models.CharField(_("match"), max_length=256, blank=True) handler_type = models.CharField(_("handler"), max_length=256, blank=True, help_text=_("Handler used for processing this Service. A handler " "enables customized behaviour far beyond what options " "here allow to."), choices=ServiceHandler.get_plugin_choices()) is_active = models.BooleanField(_("is active"), default=True) # Billing billing_period = models.CharField(_("billing period"), max_length=16, help_text=_("Renewal period for recurring invoicing"), choices=( (NEVER, _("One time service")), (MONTHLY, _("Monthly billing")), (ANUAL, _("Anual billing")), ), default=ANUAL, blank=True) billing_point = models.CharField(_("billing point"), max_length=16, help_text=_("Reference point for calculating the renewal date " "on recurring invoices"), choices=( (ON_REGISTER, _("Registration date")), (FIXED_DATE, _("Fixed billing date")), ), default=FIXED_DATE) # delayed_billing = models.CharField(_("delayed billing"), max_length=16, # help_text=_("Period in which this service will be ignored for billing"), # choices=( # (NEVER, _("No delay (inmediate billing)")), # (TEN_DAYS, _("Ten days")), # (ONE_MONTH, _("One month")), # ), # default=ONE_MONTH, blank=True) is_fee = models.BooleanField(_("is fee"), default=False, help_text=_("Designates whether this service should be billed as " " membership fee or not")) # Pricing metric = models.CharField(_("metric"), max_length=256, blank=True, help_text=_("Metric used to compute the pricing rate. " "Number of orders is used when left blank.")) nominal_price = models.DecimalField(_("nominal price"), max_digits=12, decimal_places=2) tax = models.PositiveIntegerField(_("tax"), choices=settings.SERVICES_SERVICE_TAXES, default=settings.SERVICES_SERVICE_DEFAUL_TAX) pricing_period = models.CharField(_("pricing period"), max_length=16, help_text=_("Period used for calculating the metric used on the " "pricing rate"), choices=( (BILLING_PERIOD, _("Same as billing period")), (MONTHLY, _("Monthly data")), (ANUAL, _("Anual data")), ), default=BILLING_PERIOD) rate_algorithm = models.CharField(_("rate algorithm"), max_length=16, help_text=_("Algorithm used to interprete the rating table"), choices=( (STEP_PRICE, _("Step price")), (MATCH_PRICE, _("Match price")), ), default=STEP_PRICE) # orders_effect = models.CharField(_("orders effect"), max_length=16, # help_text=_("Defines the lookup behaviour when using orders for " # "the pricing rate computation of this service."), # choices=( # (REGISTER_OR_RENEW, _("Register or renew events")), # (CONCURRENT, _("Active at every given time")), # ), # default=CONCURRENT) on_cancel = models.CharField(_("on cancel"), max_length=16, help_text=_("Defines the cancellation behaviour of this service"), choices=( (NOTHING, _("Nothing")), (DISCOUNT, _("Discount")), (REFOUND, _("Refound")), ), default=DISCOUNT) payment_style = models.CharField(_("payment style"), max_length=16, help_text=_("Designates whether this service should be paid after " "consumtion (postpay/on demand) or prepaid"), choices=( (PREPAY, _("Prepay")), (POSTPAY, _("Postpay (on demand)")), ), default=PREPAY) # trial_period = models.CharField(_("trial period"), max_length=16, blank=True, # help_text=_("Period in which no charge will be issued"), # choices=( # (NEVER, _("No trial")), # (TEN_DAYS, _("Ten days")), # (ONE_MONTH, _("One month")), # ), # default=NEVER) # refound_period = models.CharField(_("refound period"), max_length=16, # help_text=_("Period in which automatic refound will be performed on " # "service cancellation"), # choices=( # (NEVER, _("Never refound")), # (TEN_DAYS, _("Ten days")), # (ONE_MONTH, _("One month")), # (ALWAYS, _("Always refound")), # ), # default=NEVER, blank=True) def __unicode__(self): return self.description @classmethod def get_services(cls, instance): cache = caches.get_request_cache() ct = ContentType.objects.get_for_model(instance) services = cache.get(ct) if services is None: services = cls.objects.filter(content_type=ct, is_active=True) cache.set(ct, services) return services # FIXME some times caching is nasty, do we really have to? make get_plugin more efficient? # @property @cached_property def handler(self): """ Accessor of this service handler instance """ if self.handler_type: return ServiceHandler.get_plugin(self.handler_type)(self) return ServiceHandler(self) def clean(self): content_type = self.handler.get_content_type() if self.content_type != content_type: ct = str(content_type) raise ValidationError(_("Content type must be equal to '%s'.") % ct) if not self.match: raise ValidationError(_("Match should be provided")) try: obj = content_type.model_class().objects.all()[0] except IndexError: pass else: attr = None try: bool(self.handler.matches(obj)) except Exception as exception: attr = "Matches" try: metric = self.handler.get_metric(obj) if metric is not None: int(metric) except Exception as exception: attr = "Get metric" if attr is not None: name = type(exception).__name__ message = exception.message msg = "{0} {1}: {2}".format(attr, name, message) raise ValidationError(msg) def get_pricing_period(self): if self.pricing_period == self.BILLING_PERIOD: return self.billing_period return self.pricing_period def get_price(self, account, metric, rates=None, position=None): """ if position is provided an specific price for that position is returned, accumulated price is returned otherwise """ if rates is None: rates = self.get_rates(account) if not rates: rates = [{ 'quantity': metric, 'price': self.nominal_price, }] else: rates = self.rate_method(rates, metric) counter = 0 if position is None: ant_counter = 0 accumulated = 0 for rate in rates: counter += rate['quantity'] if counter >= metric: counter = metric accumulated += (counter - ant_counter) * rate['price'] return decimal.Decimal(accumulated) ant_counter = counter accumulated += rate['price'] * rate['quantity'] else: for rate in rates: counter += rate['quantity'] if counter >= position: return decimal.Decimal(rate['price']) def get_rates(self, account, cache=True): # rates are cached per account if not cache: return self.rates.by_account(account) if not hasattr(self, '__cached_rates'): self.__cached_rates = {} rates = self.__cached_rates.get(account.id, self.rates.by_account(account)) return rates @property def rate_method(self): return self.RATE_METHODS[self.rate_algorithm] accounts.register(ContractedPlan) services.register(ContractedPlan, menu=False)