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https://gitlab.crans.org/bde/nk20
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355 lines
10 KiB
Python
355 lines
10 KiB
Python
# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
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# SPDX-License-Identifier: GPL-3.0-or-later
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from datetime import datetime
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from django.contrib.auth.models import User
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from django.core.exceptions import ValidationError
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from django.db import models
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from django.db.models import Q
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from django.template.loader import render_to_string
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from django.utils import timezone
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from django.utils.translation import gettext_lazy as _
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from note.models import NoteSpecial, SpecialTransaction, MembershipTransaction
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class Invoice(models.Model):
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"""
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An invoice model that can generates a true invoice.
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"""
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id = models.PositiveIntegerField(
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primary_key=True,
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verbose_name=_("Invoice identifier"),
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)
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bde = models.CharField(
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max_length=32,
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default='Saperlistpopette.png',
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choices=(
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('Saperlistpopette.png', 'Saper[list]popette'),
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('Finalist.png', 'Fina[list]'),
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('Listorique.png', '[List]orique'),
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('Satellist.png', 'Satel[list]'),
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('Monopolist.png', 'Monopo[list]'),
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('Kataclist.png', 'Katac[list]'),
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),
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verbose_name=_("BDE"),
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)
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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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)
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description = models.TextField(
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verbose_name=_("Description")
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)
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name = models.CharField(
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max_length=255,
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verbose_name=_("Name"),
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)
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address = models.TextField(
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verbose_name=_("Address"),
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)
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date = models.DateField(
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default=timezone.now,
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verbose_name=_("Date"),
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)
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acquitted = models.BooleanField(
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verbose_name=_("Acquitted"),
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default=False,
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)
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locked = models.BooleanField(
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verbose_name=_("Locked"),
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help_text=_("An invoice can't be edited when it is locked."),
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default=False,
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)
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tex = models.TextField(
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default="",
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verbose_name=_("tex source"),
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)
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def save(self, *args, **kwargs):
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"""
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When an invoice is generated, we store the tex source.
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The advantage is to never change the template.
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Warning: editing this model regenerate the tex source, so be careful.
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"""
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old_invoice = Invoice.objects.filter(id=self.id)
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if old_invoice.exists():
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if old_invoice.get().locked:
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raise ValidationError(_("This invoice is locked and can no longer be edited."))
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products = self.products.all()
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self.place = "Gif-sur-Yvette"
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self.my_name = "BDE ENS Cachan"
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self.my_address_street = "4 avenue des Sciences"
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self.my_city = "91190 Gif-sur-Yvette"
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self.bank_code = 30003
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self.desk_code = 3894
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self.account_number = 37280662
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self.rib_key = 14
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self.bic = "SOGEFRPP"
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# Fill the template with the information
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self.tex = render_to_string("treasury/invoice_sample.tex", dict(obj=self, products=products))
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return super().save(*args, **kwargs)
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class Meta:
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verbose_name = _("invoice")
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verbose_name_plural = _("invoices")
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class Product(models.Model):
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"""
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Product that appears on an invoice.
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"""
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invoice = models.ForeignKey(
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Invoice,
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on_delete=models.CASCADE,
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related_name="products",
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verbose_name=_("invoice"),
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)
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designation = models.CharField(
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max_length=255,
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verbose_name=_("Designation"),
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)
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quantity = models.PositiveIntegerField(
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verbose_name=_("Quantity")
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)
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amount = models.IntegerField(
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verbose_name=_("Unit price")
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)
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@property
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def amount_euros(self):
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return self.amount / 100
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@property
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def total(self):
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return self.quantity * self.amount
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@property
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def total_euros(self):
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return self.total / 100
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class Meta:
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verbose_name = _("product")
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verbose_name_plural = _("products")
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class RemittanceType(models.Model):
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"""
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Store what kind of remittances can be stored.
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"""
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note = models.OneToOneField(
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NoteSpecial,
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on_delete=models.CASCADE,
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)
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def __str__(self):
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return str(self.note)
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class Meta:
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verbose_name = _("remittance type")
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verbose_name_plural = _("remittance types")
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class Remittance(models.Model):
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"""
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Treasurers want to regroup checks or bank transfers in bank remittances.
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"""
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date = models.DateTimeField(
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default=timezone.now,
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verbose_name=_("Date"),
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)
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remittance_type = models.ForeignKey(
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RemittanceType,
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on_delete=models.PROTECT,
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verbose_name=_("Type"),
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)
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comment = models.CharField(
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max_length=255,
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verbose_name=_("Comment"),
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)
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closed = models.BooleanField(
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default=False,
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verbose_name=_("Closed"),
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)
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class Meta:
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verbose_name = _("remittance")
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verbose_name_plural = _("remittances")
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@property
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def transactions(self):
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"""
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:return: Transactions linked to this remittance.
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"""
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if not self.pk:
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return SpecialTransaction.objects.none()
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return SpecialTransaction.objects.filter(specialtransactionproxy__remittance=self)
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def count(self):
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"""
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Linked transactions count.
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"""
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return self.transactions.count()
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@property
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def amount(self):
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"""
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Total amount of the remittance.
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"""
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return sum(transaction.total for transaction in self.transactions.all())
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def save(self, force_insert=False, force_update=False, using=None, update_fields=None):
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# Check if all transactions have the right type.
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if 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):
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return _("Remittance #{:d}: {}").format(self.id, self.comment, )
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class SpecialTransactionProxy(models.Model):
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"""
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In order to keep modularity, we don't that the Note app depends on the treasury app.
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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.
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"""
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transaction = models.OneToOneField(
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SpecialTransaction,
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on_delete=models.CASCADE,
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)
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remittance = models.ForeignKey(
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Remittance,
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on_delete=models.PROTECT,
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null=True,
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verbose_name=_("Remittance"),
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)
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class Meta:
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verbose_name = _("special transaction proxy")
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verbose_name_plural = _("special transaction proxies")
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class SogeCredit(models.Model):
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"""
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Manage the credits from the Société générale.
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"""
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user = models.OneToOneField(
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User,
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on_delete=models.PROTECT,
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verbose_name=_("user"),
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)
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transactions = models.ManyToManyField(
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MembershipTransaction,
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related_name="+",
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verbose_name=_("membership transactions"),
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)
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credit_transaction = models.OneToOneField(
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SpecialTransaction,
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on_delete=models.SET_NULL,
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verbose_name=_("credit transaction"),
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null=True,
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)
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@property
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def valid(self):
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return self.credit_transaction is not None
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@property
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def amount(self):
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return sum(transaction.total for transaction in self.transactions.all())
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def invalidate(self):
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"""
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Invalidating a Société générale delete the transaction of the bank if it was already created.
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Treasurers must know what they do, With Great Power Comes Great Responsibility...
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"""
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if self.valid:
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self.credit_transaction.valid = False
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self.credit_transaction._force_save = True
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self.credit_transaction.save()
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self.credit_transaction._force_delete = True
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self.credit_transaction.delete()
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self.credit_transaction = None
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for transaction in self.transactions.all():
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transaction.valid = False
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transaction._force_save = True
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transaction.save()
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def validate(self, force=False):
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if self.valid and not force:
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# The credit is already done
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return
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# First invalidate all transaction and delete the credit if already did (and force mode)
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self.invalidate()
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self.credit_transaction = SpecialTransaction.objects.create(
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source=NoteSpecial.objects.get(special_type="Virement bancaire"),
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destination=self.user.note,
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quantity=1,
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amount=self.amount,
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reason="Crédit société générale",
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last_name=self.user.last_name,
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first_name=self.user.first_name,
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bank="Société générale",
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)
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self.save()
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for transaction in self.transactions.all():
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transaction.valid = True
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transaction._force_save = True
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transaction.created_at = datetime.now()
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transaction.save()
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def delete(self, **kwargs):
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"""
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Deleting a SogeCredit is equivalent to say that the Société générale didn't pay.
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Treasurers must know what they do, this is difficult to undo this operation.
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With Great Power Comes Great Responsibility...
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"""
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total_fee = sum(transaction.total for transaction in self.transactions.all() if not transaction.valid)
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if self.user.note.balance < total_fee:
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raise ValidationError(_("This user doesn't have enough money to pay the memberships with its note. "
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"Please ask her/him to credit the note before invalidating this credit."))
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self.invalidate()
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for transaction in self.transactions.all():
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transaction._force_save = True
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transaction.valid = True
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transaction.created_at = datetime.now()
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transaction.save()
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super().delete(**kwargs)
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class Meta:
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verbose_name = _("Credit from the Société générale")
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verbose_name_plural = _("Credits from the Société générale")
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