925 lines
35 KiB
Python
925 lines
35 KiB
Python
from django.db import models
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from django.db.models import Q
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from django.contrib.auth import get_user_model
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from django.utils.translation import gettext_lazy as _
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from django.core.validators import MinValueValidator
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from django.utils import timezone
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from django.core.exceptions import ObjectDoesNotExist, ValidationError
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import uuid
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import logging
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from functools import reduce
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import itertools
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from math import ceil
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from datetime import timedelta
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from calendar import monthrange
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from decimal import Decimal
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import uncloud_pay.stripe
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from uncloud_pay.helpers import beginning_of_month, end_of_month
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from uncloud_pay import AMOUNT_DECIMALS, AMOUNT_MAX_DIGITS, COUNTRIES
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from uncloud.models import UncloudModel, UncloudStatus
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from decimal import Decimal
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import decimal
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# Used to generate bill due dates.
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BILL_PAYMENT_DELAY=timedelta(days=10)
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# Initialize logger.
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logger = logging.getLogger(__name__)
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# See https://docs.djangoproject.com/en/dev/ref/models/fields/#field-choices-enum-types
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class RecurringPeriod(models.TextChoices):
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ONE_TIME = 'ONCE', _('Onetime')
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PER_YEAR = 'YEAR', _('Per Year')
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PER_MONTH = 'MONTH', _('Per Month')
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PER_WEEK = 'WEEK', _('Per Week')
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PER_DAY = 'DAY', _('Per Day')
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PER_HOUR = 'HOUR', _('Per Hour')
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PER_MINUTE = 'MINUTE', _('Per Minute')
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PER_SECOND = 'SECOND', _('Per Second')
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class CountryField(models.CharField):
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def __init__(self, *args, **kwargs):
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kwargs.setdefault('choices', COUNTRIES)
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kwargs.setdefault('default', 'CH')
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kwargs.setdefault('max_length', 2)
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super(CountryField, self).__init__(*args, **kwargs)
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def get_internal_type(self):
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return "CharField"
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def get_balance_for_user(user):
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bills = reduce(
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lambda acc, entry: acc + entry.total,
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Bill.objects.filter(owner=user),
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0)
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payments = reduce(
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lambda acc, entry: acc + entry.amount,
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Payment.objects.filter(owner=user),
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0)
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return payments - bills
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class StripeCustomer(models.Model):
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owner = models.OneToOneField( get_user_model(),
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primary_key=True,
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on_delete=models.CASCADE)
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stripe_id = models.CharField(max_length=32)
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###
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# Payments and Payment Methods.
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class Payment(models.Model):
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uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
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owner = models.ForeignKey(get_user_model(),
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on_delete=models.CASCADE)
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amount = models.DecimalField(
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default=0.0,
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max_digits=AMOUNT_MAX_DIGITS,
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decimal_places=AMOUNT_DECIMALS,
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validators=[MinValueValidator(0)])
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source = models.CharField(max_length=256,
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choices = (
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('wire', 'Wire Transfer'),
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('stripe', 'Stripe'),
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('voucher', 'Voucher'),
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('referral', 'Referral'),
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('unknown', 'Unknown')
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),
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default='unknown')
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timestamp = models.DateTimeField(editable=False, auto_now_add=True)
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# We override save() in order to active products awaiting payment.
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def save(self, *args, **kwargs):
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# _state.adding is switched to false after super(...) call.
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being_created = self._state.adding
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unpaid_bills_before_payment = Bill.get_unpaid_for(self.owner)
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super(Payment, self).save(*args, **kwargs) # Save payment in DB.
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unpaid_bills_after_payment = Bill.get_unpaid_for(self.owner)
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newly_paid_bills = list(
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set(unpaid_bills_before_payment) - set(unpaid_bills_after_payment))
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for bill in newly_paid_bills:
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bill.activate_products()
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class PaymentMethod(models.Model):
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uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
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owner = models.ForeignKey(get_user_model(),
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on_delete=models.CASCADE,
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editable=False)
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source = models.CharField(max_length=256,
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choices = (
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('stripe', 'Stripe'),
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('unknown', 'Unknown'),
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),
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default='stripe')
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description = models.TextField()
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primary = models.BooleanField(default=False, editable=False)
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# Only used for "Stripe" source
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stripe_payment_method_id = models.CharField(max_length=32, blank=True, null=True)
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stripe_setup_intent_id = models.CharField(max_length=32, blank=True, null=True)
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@property
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def stripe_card_last4(self):
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if self.source == 'stripe' and self.active:
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payment_method = uncloud_pay.stripe.get_payment_method(
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self.stripe_payment_method_id)
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return payment_method.card.last4
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else:
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return None
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@property
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def active(self):
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if self.source == 'stripe' and self.stripe_payment_method_id != None:
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return True
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else:
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return False
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def charge(self, amount):
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if not self.active:
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raise Exception('This payment method is inactive.')
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if amount < 0: # Make sure we don't charge negative amount by errors...
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raise Exception('Cannot charge negative amount.')
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if self.source == 'stripe':
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stripe_customer = StripeCustomer.objects.get(owner=self.owner).stripe_id
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stripe_payment = uncloud_pay.stripe.charge_customer(
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amount, stripe_customer, self.stripe_payment_method_id)
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if 'paid' in stripe_payment and stripe_payment['paid'] == False:
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raise Exception(stripe_payment['error'])
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else:
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payment = Payment.objects.create(
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owner=self.owner, source=self.source, amount=amount)
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return payment
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else:
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raise Exception('This payment method is unsupported/cannot be charged.')
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def set_as_primary_for(self, user):
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methods = PaymentMethod.objects.filter(owner=user, primary=True)
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for method in methods:
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print(method)
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method.primary = False
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method.save()
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self.primary = True
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self.save()
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def get_primary_for(user):
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methods = PaymentMethod.objects.filter(owner=user)
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for method in methods:
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# Do we want to do something with non-primary method?
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if method.active and method.primary:
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return method
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return None
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class Meta:
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# TODO: limit to one primary method per user.
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# unique_together is no good since it won't allow more than one
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# non-primary method.
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pass
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###
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# Bills.
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class BillingAddress(models.Model):
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uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
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owner = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
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organization = models.CharField(max_length=100)
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name = models.CharField(max_length=100)
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street = models.CharField(max_length=100)
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city = models.CharField(max_length=50)
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postal_code = models.CharField(max_length=50)
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country = CountryField(blank=True)
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vat_number = models.CharField(max_length=100, default="", blank=True)
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@staticmethod
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def get_addresses_for(user):
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return BillingAddress.objects.filter(owner=user)
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@classmethod
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def get_preferred_address_for(cls, user):
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addresses = cls.get_addresses_for(user)
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if len(addresses) == 0:
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return None
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else:
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# TODO: allow user to set primary/preferred address
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return addresses[0]
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def __str__(self):
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return "{}, {}, {} {}, {}".format(
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self.name, self.street, self.postal_code, self.city,
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self.country)
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# Populated with the import-vat-numbers django command.
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class VATRate(models.Model):
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start_date = models.DateField(blank=True, null=True)
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stop_date = models.DateField(blank=True, null=True)
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territory_codes = models.TextField(blank=True, default='')
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currency_code = models.CharField(max_length=10)
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rate = models.FloatField()
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rate_type = models.TextField(blank=True, default='')
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description = models.TextField(blank=True, default='')
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@staticmethod
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def get_for_country(country_code):
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vat_rate = None
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try:
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vat_rate = VATRate.objects.get(
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territory_codes=country_code, start_date__isnull=False, stop_date=None
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)
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return vat_rate.rate
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except VATRate.DoesNotExist as dne:
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logger.debug(str(dne))
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logger.debug("Did not find VAT rate for %s, returning 0" % country_code)
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return 0
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class BillNico(models.Model):
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uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
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owner = models.ForeignKey(get_user_model(),
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on_delete=models.CASCADE)
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creation_date = models.DateTimeField(auto_now_add=True)
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starting_date = models.DateTimeField()
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ending_date = models.DateTimeField()
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due_date = models.DateField()
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valid = models.BooleanField(default=True)
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class Bill(models.Model):
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uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
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owner = models.ForeignKey(get_user_model(),
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on_delete=models.CASCADE)
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creation_date = models.DateTimeField(auto_now_add=True)
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starting_date = models.DateTimeField()
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ending_date = models.DateTimeField()
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due_date = models.DateField()
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valid = models.BooleanField(default=True)
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# Trigger product activation if bill paid at creation (from balance).
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def save(self, *args, **kwargs):
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super(Bill, self).save(*args, **kwargs)
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if not self in Bill.get_unpaid_for(self.owner):
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self.activate_products()
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@property
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def reference(self):
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return "{}-{}".format(
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self.owner.username,
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self.creation_date.strftime("%Y-%m-%d-%H%M"))
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@property
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def records(self):
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bill_records = []
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orders = Order.objects.filter(bill=self)
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for order in orders:
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bill_record = BillRecord(self, order)
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bill_records.append(bill_record)
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return bill_records
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@property
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def amount(self):
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return reduce(lambda acc, record: acc + record.amount, self.records, 0)
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@property
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def vat_amount(self):
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return reduce(lambda acc, record: acc + record.vat_amount, self.records, 0)
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@property
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def total(self):
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return self.amount + self.vat_amount
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@property
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def final(self):
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# A bill is final when its ending date is passed, or when all of its
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# orders have been terminated.
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every_order_terminated = True
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billing_period_is_over = self.ending_date < timezone.now()
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for order in self.order_set.all():
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every_order_terminated = every_order_terminated and order.is_terminated
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return billing_period_is_over or every_order_terminated
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def activate_products(self):
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for order in self.order_set.all():
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# FIXME: using __something might not be a good idea.
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for product_class in Product.__subclasses__():
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for product in product_class.objects.filter(order=order):
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if product.status == UncloudStatus.AWAITING_PAYMENT:
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product.status = UncloudStatus.PENDING
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product.save()
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@property
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def billing_address(self):
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orders = Order.objects.filter(bill=self)
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# The genrate_for method makes sure all the orders of a bill share the
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# same billing address. TODO: It would be nice to enforce that somehow...
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if orders:
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return orders[0].billing_address
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else:
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return None
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# TODO: split this huuuge method!
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@staticmethod
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def generate_for(year, month, user):
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# /!\ We exclusively work on the specified year and month.
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generated_bills = []
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# Default values for next bill (if any).
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starting_date=beginning_of_month(year, month)
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ending_date=end_of_month(year, month)
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creation_date=timezone.now()
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# Select all orders active on the request period (i.e. starting on or after starting_date).
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orders = Order.objects.filter(
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Q(ending_date__gte=starting_date) | Q(ending_date__isnull=True),
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owner=user)
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# Check if there is already a bill covering the order and period pair:
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# * Get latest bill by ending_date: previous_bill.ending_date
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# * For monthly bills: if previous_bill.ending_date is before
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# (next_bill) ending_date, a new bill has to be generated.
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# * For yearly bill: if previous_bill.ending_date is on working
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# month, generate new bill.
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unpaid_orders = { 'monthly_or_less': [], 'yearly': {} }
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for order in orders:
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try:
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previous_bill = order.bill.latest('ending_date')
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except ObjectDoesNotExist:
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previous_bill = None
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# FIXME: control flow is confusing in this block.
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if order.recurring_period == RecurringPeriod.PER_YEAR:
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# We ignore anything smaller than a day in here.
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next_yearly_bill_start_on = None
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if previous_bill == None:
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next_yearly_bill_start_on = order.starting_date
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elif previous_bill.ending_date <= ending_date:
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next_yearly_bill_start_on = (previous_bill.ending_date + timedelta(days=1))
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# Store for bill generation. One bucket per day of month with a starting bill.
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# bucket is a reference here, no need to reassign.
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if next_yearly_bill_start_on:
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# We want to group orders by date but keep using datetimes.
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next_yearly_bill_start_on = next_yearly_bill_start_on.replace(
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minute=0, hour=0, second=0, microsecond=0)
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bucket = unpaid_orders['yearly'].get(next_yearly_bill_start_on)
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if bucket == None:
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unpaid_orders['yearly'][next_yearly_bill_start_on] = [order]
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else:
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unpaid_orders['yearly'][next_yearly_bill_start_on] = bucket + [order]
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else:
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if previous_bill == None or previous_bill.ending_date < ending_date:
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unpaid_orders['monthly_or_less'].append(order)
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# Handle working month's billing.
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if len(unpaid_orders['monthly_or_less']) > 0:
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# TODO: PREPAID billing is not supported yet.
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prepaid_due_date = min(creation_date, starting_date) + BILL_PAYMENT_DELAY
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postpaid_due_date = max(creation_date, ending_date) + BILL_PAYMENT_DELAY
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# There should not be any bill linked to orders with different
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# billing addresses.
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per_address_orders = itertools.groupby(
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unpaid_orders['monthly_or_less'],
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lambda o: o.billing_address)
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for addr, bill_orders in per_address_orders:
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next_monthly_bill = Bill.objects.create(owner=user,
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creation_date=creation_date,
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starting_date=starting_date, # FIXME: this is a hack!
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ending_date=ending_date,
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due_date=postpaid_due_date)
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# It is not possible to register many-to-many relationship before
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# the two end-objects are saved in database.
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for order in bill_orders:
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order.bill.add(next_monthly_bill)
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logger.info("Generated monthly bill {} (amount: {}) for user {}."
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.format(next_monthly_bill.uuid, next_monthly_bill.total, user))
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# Add to output.
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generated_bills.append(next_monthly_bill)
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# Handle yearly bills starting on working month.
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if len(unpaid_orders['yearly']) > 0:
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# For every starting date, generate new bill.
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for next_yearly_bill_start_on in unpaid_orders['yearly']:
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# No postpaid for yearly payments.
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prepaid_due_date = min(creation_date, next_yearly_bill_start_on) + BILL_PAYMENT_DELAY
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# Bump by one year, remove one day.
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ending_date = next_yearly_bill_start_on.replace(
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year=next_yearly_bill_start_on.year+1) - timedelta(days=1)
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# There should not be any bill linked to orders with different
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# billing addresses.
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per_address_orders = itertools.groupby(
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unpaid_orders['yearly'][next_yearly_bill_start_on],
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lambda o: o.billing_address)
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for addr, bill_orders in per_address_orders:
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next_yearly_bill = Bill.objects.create(owner=user,
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creation_date=creation_date,
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starting_date=next_yearly_bill_start_on,
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ending_date=ending_date,
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due_date=prepaid_due_date)
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# It is not possible to register many-to-many relationship before
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# the two end-objects are saved in database.
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for order in bill_orders:
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order.bill.add(next_yearly_bill)
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logger.info("Generated yearly bill {} (amount: {}) for user {}."
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.format(next_yearly_bill.uuid, next_yearly_bill.total, user))
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# Add to output.
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generated_bills.append(next_yearly_bill)
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# Return generated (monthly + yearly) bills.
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return generated_bills
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@staticmethod
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def get_unpaid_for(user):
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balance = get_balance_for_user(user)
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unpaid_bills = []
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# No unpaid bill if balance is positive.
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if balance >= 0:
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return unpaid_bills
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else:
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bills = Bill.objects.filter(
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owner=user,
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).order_by('-creation_date')
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# Amount to be paid by the customer.
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unpaid_balance = abs(balance)
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for bill in bills:
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if unpaid_balance <= 0:
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break
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unpaid_balance -= bill.total
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unpaid_bills.append(bill)
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return unpaid_bills
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@staticmethod
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def get_overdue_for(user):
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unpaid_bills = Bill.get_unpaid_for(user)
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return list(filter(lambda bill: bill.due_date > timezone.now(), unpaid_bills))
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class BillRecord():
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"""
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Entry of a bill, dynamically generated from an order.
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"""
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def __init__(self, bill, order):
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self.bill = bill
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self.order = order
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self.recurring_price = order.recurring_price
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self.recurring_period = order.recurring_period
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|
self.description = order.description
|
|
|
|
if self.order.starting_date >= self.bill.starting_date:
|
|
self.one_time_price = order.one_time_price
|
|
else:
|
|
self.one_time_price = 0
|
|
|
|
# Set decimal context for amount computations.
|
|
# XXX: understand why we need +1 here.
|
|
decimal.getcontext().prec = AMOUNT_DECIMALS + 1
|
|
|
|
@property
|
|
def recurring_count(self):
|
|
# Compute billing delta.
|
|
billed_until = self.bill.ending_date
|
|
if self.order.ending_date != None and self.order.ending_date <= self.bill.ending_date:
|
|
billed_until = self.order.ending_date
|
|
|
|
billed_from = self.bill.starting_date
|
|
if self.order.starting_date > self.bill.starting_date:
|
|
billed_from = self.order.starting_date
|
|
|
|
if billed_from > billed_until:
|
|
# TODO: think about and check edge cases. This should not be
|
|
# possible.
|
|
raise Exception('Impossible billing delta!')
|
|
|
|
billed_delta = billed_until - billed_from
|
|
|
|
# TODO: refactor this thing?
|
|
# TODO: weekly
|
|
if self.recurring_period == RecurringPeriod.PER_YEAR:
|
|
# XXX: Should always be one => we do not bill for more than one year.
|
|
# TODO: check billed_delta is ~365 days.
|
|
return 1
|
|
elif self.recurring_period == RecurringPeriod.PER_MONTH:
|
|
days = ceil(billed_delta / timedelta(days=1))
|
|
|
|
# Monthly bills always cover one single month.
|
|
if (self.bill.starting_date.year != self.bill.starting_date.year or
|
|
self.bill.starting_date.month != self.bill.ending_date.month):
|
|
raise Exception('Bill {} covers more than one month. Cannot bill PER_MONTH.'.
|
|
format(self.bill.uuid))
|
|
|
|
# XXX: minumal length of monthly order is to be enforced somewhere else.
|
|
(_, days_in_month) = monthrange(
|
|
self.bill.starting_date.year,
|
|
self.bill.starting_date.month)
|
|
return round(days / days_in_month, AMOUNT_DECIMALS)
|
|
elif self.recurring_period == RecurringPeriod.PER_WEEK:
|
|
weeks = ceil(billed_delta / timedelta(week=1))
|
|
return weeks
|
|
elif self.recurring_period == RecurringPeriod.PER_DAY:
|
|
days = ceil(billed_delta / timedelta(days=1))
|
|
return days
|
|
elif self.recurring_period == RecurringPeriod.PER_HOUR:
|
|
hours = ceil(billed_delta / timedelta(hours=1))
|
|
return hours
|
|
elif self.recurring_period == RecurringPeriod.PER_SECOND:
|
|
seconds = ceil(billed_delta / timedelta(seconds=1))
|
|
return seconds
|
|
elif self.recurring_period == RecurringPeriod.ONE_TIME:
|
|
return 0
|
|
else:
|
|
raise Exception('Unsupported recurring period: {}.'.
|
|
format(self.order.recurring_period))
|
|
|
|
@property
|
|
def vat_rate(self):
|
|
return Decimal(VATRate.get_for_country(self.bill.billing_address.country))
|
|
|
|
@property
|
|
def vat_amount(self):
|
|
return self.amount * self.vat_rate
|
|
|
|
@property
|
|
def amount(self):
|
|
return Decimal(float(self.recurring_price) * self.recurring_count) + self.one_time_price
|
|
|
|
@property
|
|
def total(self):
|
|
return self.amount + self.vat_amount
|
|
|
|
###
|
|
# Orders.
|
|
|
|
# Order are assumed IMMUTABLE and used as SOURCE OF TRUST for generating
|
|
# bills. Do **NOT** mutate then!
|
|
class Order(models.Model):
|
|
uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
|
|
owner = models.ForeignKey(get_user_model(),
|
|
on_delete=models.CASCADE,
|
|
editable=False)
|
|
billing_address = models.ForeignKey(BillingAddress, on_delete=models.CASCADE)
|
|
description = models.TextField()
|
|
replaced_by = models.ForeignKey('self', on_delete=models.CASCADE, blank=True, null=True)
|
|
|
|
# TODO: enforce ending_date - starting_date to be larger than recurring_period.
|
|
creation_date = models.DateTimeField(auto_now_add=True)
|
|
starting_date = models.DateTimeField(default=timezone.now)
|
|
ending_date = models.DateTimeField(blank=True,
|
|
null=True)
|
|
|
|
bill = models.ManyToManyField(Bill,
|
|
editable=False,
|
|
blank=True)
|
|
|
|
recurring_period = models.CharField(max_length=32,
|
|
choices = RecurringPeriod.choices,
|
|
default = RecurringPeriod.PER_MONTH)
|
|
|
|
one_time_price = models.DecimalField(default=0.0,
|
|
max_digits=AMOUNT_MAX_DIGITS,
|
|
decimal_places=AMOUNT_DECIMALS,
|
|
validators=[MinValueValidator(0)])
|
|
|
|
recurring_price = models.DecimalField(default=0.0,
|
|
max_digits=AMOUNT_MAX_DIGITS,
|
|
decimal_places=AMOUNT_DECIMALS,
|
|
validators=[MinValueValidator(0)])
|
|
|
|
replaced_by = models.ForeignKey('self',
|
|
related_name='supersede',
|
|
on_delete=models.PROTECT,
|
|
blank=True,
|
|
null=True)
|
|
|
|
depends_on = models.ForeignKey('self',
|
|
related_name='parent_of',
|
|
on_delete=models.PROTECT,
|
|
blank=True,
|
|
null=True)
|
|
|
|
def active_before(self, ending_date):
|
|
# Was this order started before the specified ending date?
|
|
if self.starting_date <= ending_date:
|
|
if self.ending_date:
|
|
if self.ending_date > ending_date:
|
|
|
|
@property
|
|
def is_recurring(self):
|
|
return not self.recurring_period == RecurringPeriod.ONE_TIME
|
|
|
|
@property
|
|
def is_terminated(self):
|
|
return self.ending_date != None and self.ending_date < timezone.now()
|
|
|
|
def is_terminated_at(self, a_date):
|
|
return self.ending_date != None and self.ending_date < timezone.now()
|
|
|
|
def terminate(self):
|
|
if not self.is_terminated:
|
|
self.ending_date = timezone.now()
|
|
self.save()
|
|
|
|
# Trigger initial bill generation at order creation.
|
|
def save(self, *args, **kwargs):
|
|
if self.ending_date and self.ending_date < self.starting_date:
|
|
raise ValidationError("End date cannot be before starting date")
|
|
|
|
super().save(*args, **kwargs)
|
|
|
|
def generate_initial_bill(self):
|
|
return Bill.generate_for(self.starting_date.year, self.starting_date.month, self.owner)
|
|
|
|
# Used by uncloud_pay tests.
|
|
@property
|
|
def bills(self):
|
|
return Bill.objects.filter(order=self)
|
|
|
|
@staticmethod
|
|
def from_product(product, **kwargs):
|
|
# FIXME: this is only a workaround.
|
|
billing_address = BillingAddress.get_preferred_address_for(product.owner)
|
|
if billing_address == None:
|
|
raise Exception("Owner does not have a billing address!")
|
|
|
|
return Order(description=product.description,
|
|
one_time_price=product.one_time_price,
|
|
recurring_price=product.recurring_price,
|
|
billing_address=billing_address,
|
|
owner=product.owner,
|
|
**kwargs)
|
|
|
|
def __str__(self):
|
|
return "Order {} created at {}, {}->{}, recurring period {}. One time price {}, recurring price {}".format(
|
|
self.uuid, self.creation_date,
|
|
self.starting_date, self.ending_date,
|
|
self.recurring_period,
|
|
self.one_time_price,
|
|
self.recurring_price)
|
|
|
|
class OrderTimothee(models.Model):
|
|
uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
|
|
owner = models.ForeignKey(get_user_model(),
|
|
on_delete=models.CASCADE,
|
|
editable=False)
|
|
billing_address = models.ForeignKey(BillingAddress, on_delete=models.CASCADE)
|
|
|
|
# TODO: enforce ending_date - starting_date to be larger than recurring_period.
|
|
creation_date = models.DateTimeField(auto_now_add=True)
|
|
starting_date = models.DateTimeField(default=timezone.now)
|
|
ending_date = models.DateTimeField(blank=True,
|
|
null=True)
|
|
|
|
bill = models.ManyToManyField(Bill,
|
|
editable=False,
|
|
blank=True)
|
|
|
|
recurring_period = models.CharField(max_length=32,
|
|
choices = RecurringPeriod.choices,
|
|
default = RecurringPeriod.PER_MONTH)
|
|
|
|
# Trigger initial bill generation at order creation.
|
|
def save(self, *args, **kwargs):
|
|
if self.ending_date and self.ending_date < self.starting_date:
|
|
raise ValidationError("End date cannot be before starting date")
|
|
|
|
super().save(*args, **kwargs)
|
|
|
|
Bill.generate_for(self.starting_date.year, self.starting_date.month, self.owner)
|
|
|
|
@property
|
|
def records(self):
|
|
return OrderRecord.objects.filter(order=self)
|
|
|
|
@property
|
|
def one_time_price(self):
|
|
return reduce(lambda acc, record: acc + record.one_time_price, self.records, 0)
|
|
|
|
@property
|
|
def recurring_price(self):
|
|
return reduce(lambda acc, record: acc + record.recurring_price, self.records, 0)
|
|
|
|
# Used by uncloud_pay tests.
|
|
@property
|
|
def bills(self):
|
|
return Bill.objects.filter(order=self)
|
|
|
|
def add_record(self, one_time_price, recurring_price, description):
|
|
OrderRecord.objects.create(order=self,
|
|
one_time_price=one_time_price,
|
|
recurring_price=recurring_price,
|
|
description=description)
|
|
|
|
def __str__(self):
|
|
return "Order {} created at {}, {}->{}, recurring period {}. Price one time {}, recurring {}".format(
|
|
self.uuid, self.creation_date,
|
|
self.starting_date, self.ending_date,
|
|
self.recurring_period,
|
|
self.one_time_price,
|
|
self.recurring_price)
|
|
|
|
|
|
|
|
class OrderRecord(models.Model):
|
|
"""
|
|
Order records store billing informations for products: the actual product
|
|
might be mutated and/or moved to another order but we do not want to loose
|
|
the details of old orders.
|
|
|
|
Used as source of trust to dynamically generate bill entries.
|
|
"""
|
|
|
|
order = models.ForeignKey(Order, on_delete=models.CASCADE)
|
|
one_time_price = models.DecimalField(default=0.0,
|
|
max_digits=AMOUNT_MAX_DIGITS,
|
|
decimal_places=AMOUNT_DECIMALS,
|
|
validators=[MinValueValidator(0)])
|
|
recurring_price = models.DecimalField(default=0.0,
|
|
max_digits=AMOUNT_MAX_DIGITS,
|
|
decimal_places=AMOUNT_DECIMALS,
|
|
validators=[MinValueValidator(0)])
|
|
|
|
description = models.TextField()
|
|
|
|
|
|
@property
|
|
def recurring_period(self):
|
|
return self.order.recurring_period
|
|
|
|
@property
|
|
def starting_date(self):
|
|
return self.order.starting_date
|
|
|
|
@property
|
|
def ending_date(self):
|
|
return self.order.ending_date
|
|
|
|
|
|
###
|
|
# Products
|
|
|
|
# Abstract (= no database representation) class used as parent for products
|
|
# (e.g. uncloud_vm.models.VMProduct).
|
|
class Product(UncloudModel):
|
|
uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
|
|
owner = models.ForeignKey(get_user_model(),
|
|
on_delete=models.CASCADE,
|
|
editable=False)
|
|
|
|
description = "Generic Product"
|
|
|
|
status = models.CharField(max_length=32,
|
|
choices=UncloudStatus.choices,
|
|
default=UncloudStatus.AWAITING_PAYMENT)
|
|
|
|
order = models.ForeignKey(Order,
|
|
on_delete=models.CASCADE,
|
|
editable=False,
|
|
null=True)
|
|
|
|
# Default period for all products
|
|
default_recurring_period = RecurringPeriod.PER_MONTH
|
|
|
|
# Used to save records.
|
|
def save(self, *args, **kwargs):
|
|
# _state.adding is switched to false after super(...) call.
|
|
being_created = self._state.adding
|
|
|
|
# First time saving - create an order
|
|
if not self.order:
|
|
billing_address = BillingAddress.get_preferred_address_for(self.owner)
|
|
print(billing_address)
|
|
|
|
if not billing_address:
|
|
raise ValidationError("Cannot order without a billing address")
|
|
|
|
# FIXME: allow user to choose recurring_period
|
|
self.order = Order.objects.create(owner=self.owner,
|
|
billing_address=billing_address,
|
|
one_time_price=self.one_time_price,
|
|
recurring_period=self.default_recurring_period,
|
|
recurring_price=self.recurring_price)
|
|
|
|
super().save(*args, **kwargs)
|
|
|
|
# # Make sure we only create records on creation.
|
|
# if being_created:
|
|
# record = OrderRecord(
|
|
# one_time_price=self.one_time_price,
|
|
# recurring_price=self.recurring_price,
|
|
# description=self.description)
|
|
# self.order.orderrecord_set.add(record, bulk=False)
|
|
|
|
@property
|
|
def recurring_price(self):
|
|
pass # To be implemented in child.
|
|
|
|
@property
|
|
def one_time_price(self):
|
|
return 0
|
|
|
|
@property
|
|
def billing_address(self):
|
|
return self.order.billing_address
|
|
|
|
@staticmethod
|
|
def allowed_recurring_periods():
|
|
return RecurringPeriod.choices
|
|
|
|
class Meta:
|
|
abstract = True
|
|
|
|
def discounted_price_by_period(self, requested_period):
|
|
"""
|
|
Each product has a standard recurring period for which
|
|
we define a pricing. I.e. VPN is usually year, VM is usually monthly.
|
|
|
|
The user can opt-in to use a different period, which influences the price:
|
|
The longer a user commits, the higher the discount.
|
|
|
|
Products can also be limited in the available periods. For instance
|
|
a VPN only makes sense to be bought for at least one day.
|
|
|
|
Rules are as follows:
|
|
|
|
given a standard recurring period of ..., changing to ... modifies price ...
|
|
|
|
|
|
# One month for free if buying / year, compared to a month: about 8.33% discount
|
|
per_year -> per_month -> /11
|
|
per_month -> per_year -> *11
|
|
|
|
# Month has 30.42 days on average. About 7.9% discount to go monthly
|
|
per_month -> per_day -> /28
|
|
per_day -> per_month -> *28
|
|
|
|
# Day has 24h, give one for free
|
|
per_day -> per_hour -> /23
|
|
per_hour -> per_day -> /23
|
|
|
|
|
|
Examples
|
|
|
|
VPN @ 120CHF/y becomes
|
|
- 10.91 CHF/month (130.91 CHF/year)
|
|
- 0.39 CHF/day (142.21 CHF/year)
|
|
|
|
VM @ 15 CHF/month becomes
|
|
- 165 CHF/month (13.75 CHF/month)
|
|
- 0.54 CHF/day (16.30 CHF/month)
|
|
|
|
"""
|
|
|
|
|
|
if self.default_recurring_period == RecurringPeriod.PER_YEAR:
|
|
if requested_period == RecurringPeriod.PER_YEAR:
|
|
return self.recurring_price
|
|
if requested_period == RecurringPeriod.PER_MONTH:
|
|
return self.recurring_price/11.
|
|
if requested_period == RecurringPeriod.PER_DAY:
|
|
return self.recurring_price/11./28.
|
|
|
|
elif self.default_recurring_period == RecurringPeriod.PER_MONTH:
|
|
if requested_period == RecurringPeriod.PER_YEAR:
|
|
return self.recurring_price*11
|
|
if requested_period == RecurringPeriod.PER_MONTH:
|
|
return self.recurring_price
|
|
if requested_period == RecurringPeriod.PER_DAY:
|
|
return self.recurring_price/28.
|
|
|
|
elif self.default_recurring_period == RecurringPeriod.PER_DAY:
|
|
if requested_period == RecurringPeriod.PER_YEAR:
|
|
return self.recurring_price*11*28
|
|
if requested_period == RecurringPeriod.PER_MONTH:
|
|
return self.recurring_price*28
|
|
if requested_period == RecurringPeriod.PER_DAY:
|
|
return self.recurring_price
|
|
else:
|
|
# FIXME: use the right type of exception here!
|
|
raise Exception("Did not implement the discounter for this case")
|