nk20/apps/treasury/models.py

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# Copyright (C) 2018-2021 by BDE ENS Paris-Saclay
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# SPDX-License-Identifier: GPL-3.0-or-later
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from datetime import date
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from django.contrib.auth.models import User
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from django.core.exceptions import ValidationError
from django.core.validators import MinValueValidator
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from django.db import models, transaction
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from django.db.models import Q
from django.template.loader import render_to_string
from django.utils import timezone
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from django.utils.translation import gettext_lazy as _
from note.models import NoteSpecial, SpecialTransaction, MembershipTransaction, NoteUser
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class Invoice(models.Model):
"""
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An invoice model that can generates a true invoice.
"""
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id = models.PositiveIntegerField(
primary_key=True,
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verbose_name=_("Invoice identifier"),
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)
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bde = models.CharField(
max_length=32,
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default='Saperlistpopette',
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choices=(
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('Saperlistpopette', 'Saper[list]popette'),
('Finalist', 'Fina[list]'),
('Listorique', '[List]orique'),
('Satellist', 'Satel[list]'),
('Monopolist', 'Monopo[list]'),
('Kataclist', 'Katac[list]'),
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),
verbose_name=_("BDE"),
)
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object = models.CharField(
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max_length=255,
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verbose_name=_("Object"),
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)
description = models.TextField(
verbose_name=_("Description")
)
name = models.CharField(
max_length=255,
verbose_name=_("Name"),
)
address = models.TextField(
verbose_name=_("Address"),
)
date = models.DateField(
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default=date.today,
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verbose_name=_("Date"),
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)
acquitted = models.BooleanField(
verbose_name=_("Acquitted"),
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default=False,
)
locked = models.BooleanField(
verbose_name=_("Locked"),
help_text=_("An invoice can't be edited when it is locked."),
default=False,
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)
tex = models.TextField(
default="",
verbose_name=_("tex source"),
)
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@transaction.atomic
def save(self, *args, **kwargs):
"""
When an invoice is generated, we store the tex source.
The advantage is to never change the template.
Warning: editing this model regenerate the tex source, so be careful.
"""
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old_invoice = Invoice.objects.filter(id=self.id)
if old_invoice.exists():
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if old_invoice.get().locked and not self._force_save:
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raise ValidationError(_("This invoice is locked and can no longer be edited."))
products = self.products.all()
self.place = "Gif-sur-Yvette"
self.my_name = "BDE ENS Cachan"
self.my_address_street = "4 avenue des Sciences"
self.my_city = "91190 Gif-sur-Yvette"
self.bank_code = 30003
self.desk_code = 3894
self.account_number = 37280662
self.rib_key = 14
self.bic = "SOGEFRPP"
# Fill the template with the information
self.tex = render_to_string("treasury/invoice_sample.tex", dict(obj=self, products=products))
return super().save(*args, **kwargs)
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class Meta:
verbose_name = _("invoice")
verbose_name_plural = _("invoices")
def __str__(self):
return _("Invoice #{id}").format(id=self.id)
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class Product(models.Model):
"""
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Product that appears on an invoice.
"""
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invoice = models.ForeignKey(
Invoice,
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on_delete=models.CASCADE,
related_name="products",
verbose_name=_("invoice"),
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)
designation = models.CharField(
max_length=255,
verbose_name=_("Designation"),
)
quantity = models.DecimalField(
decimal_places=2,
max_digits=7,
verbose_name=_("Quantity"),
validators=[MinValueValidator(0)],
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)
amount = models.IntegerField(
verbose_name=_("Unit price"),
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)
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@property
def amount_euros(self):
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return "{:.2f}".format(self.amount / 100)
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@property
def total(self):
return self.quantity * self.amount
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@property
def total_euros(self):
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return "{:.2f}".format(self.total / 100)
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class Meta:
verbose_name = _("product")
verbose_name_plural = _("products")
def __str__(self):
return f"{self.designation} ({self.invoice})"
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class RemittanceType(models.Model):
"""
Store what kind of remittances can be stored.
"""
note = models.OneToOneField(
NoteSpecial,
on_delete=models.CASCADE,
)
def __str__(self):
return str(self.note)
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class Meta:
verbose_name = _("remittance type")
verbose_name_plural = _("remittance types")
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class Remittance(models.Model):
"""
Treasurers want to regroup checks or bank transfers in bank remittances.
"""
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date = models.DateTimeField(
default=timezone.now,
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verbose_name=_("Date"),
)
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remittance_type = models.ForeignKey(
RemittanceType,
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on_delete=models.PROTECT,
verbose_name=_("Type"),
)
comment = models.CharField(
max_length=255,
verbose_name=_("Comment"),
)
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closed = models.BooleanField(
default=False,
verbose_name=_("Closed"),
)
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class Meta:
verbose_name = _("remittance")
verbose_name_plural = _("remittances")
@property
def transactions(self):
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"""
:return: Transactions linked to this remittance.
"""
if not self.pk:
return SpecialTransaction.objects.none()
return SpecialTransaction.objects.filter(specialtransactionproxy__remittance=self)
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def count(self):
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"""
Linked transactions count.
"""
return self.transactions.count()
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@property
def amount(self):
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"""
Total amount of the remittance.
"""
return sum(transaction.total for transaction in self.transactions.all())
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@transaction.atomic
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def save(self, force_insert=False, force_update=False, using=None, update_fields=None):
# Check if all transactions have the right type.
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if self.transactions.exists() and self.transactions.filter(~Q(source=self.remittance_type.note)).exists():
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raise ValidationError("All transactions in a remittance must have the same type")
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return super().save(force_insert, force_update, using, update_fields)
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def __str__(self):
return _("Remittance #{:d}: {}").format(self.id, self.comment, )
class SpecialTransactionProxy(models.Model):
"""
In order to keep modularity, we don't that the Note app depends on the treasury app.
That's why we create a proxy in this app, to link special transactions and remittances.
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If it isn't very clean, it does what we want.
"""
transaction = models.OneToOneField(
SpecialTransaction,
on_delete=models.CASCADE,
)
remittance = models.ForeignKey(
Remittance,
on_delete=models.PROTECT,
null=True,
related_name="transaction_proxies",
verbose_name=_("Remittance"),
)
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class Meta:
verbose_name = _("special transaction proxy")
verbose_name_plural = _("special transaction proxies")
def __str__(self):
return str(self.transaction)
class SogeCredit(models.Model):
"""
Manage the credits from the Société générale.
"""
user = models.OneToOneField(
User,
on_delete=models.PROTECT,
verbose_name=_("user"),
)
transactions = models.ManyToManyField(
MembershipTransaction,
related_name="+",
verbose_name=_("membership transactions"),
)
credit_transaction = models.OneToOneField(
SpecialTransaction,
on_delete=models.SET_NULL,
verbose_name=_("credit transaction"),
null=True,
)
@property
def valid(self):
return self.credit_transaction and self.credit_transaction.valid
@property
def amount(self):
return self.credit_transaction.total if self.valid \
else sum(transaction.total for transaction in self.transactions.all()) + 8000
def invalidate(self):
"""
Invalidating a Société générale delete the transaction of the bank if it was already created.
Treasurers must know what they do, With Great Power Comes Great Responsibility...
"""
if self.valid:
self.credit_transaction.valid = False
self.credit_transaction.save()
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for tr in self.transactions.all():
tr.valid = False
tr._force_save = True
tr.save()
def validate(self, force=False):
if self.valid and not force:
# The credit is already done
return
# First invalidate all transaction and delete the credit if already did (and force mode)
self.invalidate()
# Refresh credit amount
self.save()
self.credit_transaction.valid = True
self.credit_transaction._force_save = True
self.credit_transaction.save()
self.save()
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for tr in self.transactions.all():
tr.valid = True
tr._force_save = True
tr.created_at = timezone.now()
tr.save()
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@transaction.atomic
def save(self, *args, **kwargs):
# This is a pre-registered user that declared that a SoGé account was opened.
# No note exists yet.
if not NoteUser.objects.filter(user=self.user).exists():
return super().save(*args, **kwargs)
if not self.credit_transaction:
credit_transaction = SpecialTransaction(
source=NoteSpecial.objects.get(special_type="Virement bancaire"),
destination=self.user.note,
quantity=1,
amount=0,
reason="Crédit société générale",
last_name=self.user.last_name,
first_name=self.user.first_name,
bank="Société générale",
valid=False,
)
credit_transaction._force_save = True
credit_transaction.save()
credit_transaction.refresh_from_db()
self.credit_transaction = credit_transaction
elif not self.valid:
self.credit_transaction.amount = self.amount
self.credit_transaction._force_save = True
self.credit_transaction.save()
super().save(*args, **kwargs)
def delete(self, **kwargs):
"""
Deleting a SogeCredit is equivalent to say that the Société générale didn't pay.
Treasurers must know what they do, this is difficult to undo this operation.
With Great Power Comes Great Responsibility...
"""
total_fee = sum(transaction.total for transaction in self.transactions.all() if not transaction.valid)
if self.user.note.balance < total_fee:
raise ValidationError(_("This user doesn't have enough money to pay the memberships with its note. "
"Please ask her/him to credit the note before invalidating this credit."))
self.invalidate()
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for tr in self.transactions.all():
tr._force_save = True
tr.valid = True
tr.created_at = timezone.now()
tr.save()
if self.credit_transaction:
# If the soge credit is deleted while the user is not validated yet,
# there is not credit transaction.
# There is a credit transaction iff the user declares that no bank account
# was opened after the validation of the account.
self.credit_transaction.valid = False
self.credit_transaction.reason += " (invalide)"
self.credit_transaction.save()
super().delete(**kwargs)
class Meta:
verbose_name = _("Credit from the Société générale")
verbose_name_plural = _("Credits from the Société générale")
def __str__(self):
return _("Soge credit for {user}").format(user=str(self.user))