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