mirror of
https://gitlab.crans.org/bde/nk20
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278 lines
8.5 KiB
Python
278 lines
8.5 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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import unicodedata
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from django.conf import settings
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from django.core.exceptions import ValidationError
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from django.core.validators import RegexValidator
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from django.db import models
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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 polymorphic.models import PolymorphicModel
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"""
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Defines each note types
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"""
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class Note(PolymorphicModel):
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"""
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Gives transactions capabilities. Note is a Polymorphic Model, use as based
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for the models :model:`note.NoteUser` and :model:`note.NoteClub`.
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A Note principaly store the actual balance of someone/some club.
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A Note can be searched find throught an :model:`note.Alias`
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"""
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balance = models.IntegerField(
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verbose_name=_('account balance'),
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help_text=_('in centimes, money credited for this instance'),
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default=0,
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)
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last_negative = models.DateTimeField(
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verbose_name=_('last negative date'),
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help_text=_('last time the balance was negative'),
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null=True,
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blank=True,
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)
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is_active = models.BooleanField(
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_('active'),
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default=True,
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help_text=_(
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'Designates whether this note should be treated as active. '
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'Unselect this instead of deleting notes.'),
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)
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display_image = models.ImageField(
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verbose_name=_('display image'),
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max_length=255,
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blank=False,
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null=False,
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upload_to='pic/',
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default='pic/default.png'
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)
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created_at = models.DateTimeField(
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verbose_name=_('created at'),
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default=timezone.now,
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)
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class Meta:
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verbose_name = _("note")
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verbose_name_plural = _("notes")
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def pretty(self):
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"""
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:return: Pretty name of this note
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"""
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return str(self)
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pretty.short_description = _('Note')
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@property
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def last_negative_duration(self):
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if self.balance >= 0 or self.last_negative is None:
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return None
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delta = timezone.now() - self.last_negative
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return "{:d} jours".format(delta.days)
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def save(self, *args, **kwargs):
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"""
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Save note with it's alias (called in polymorphic children)
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"""
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aliases = Alias.objects.filter(name=str(self))
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if aliases.exists():
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# Alias exists, so check if it is linked to this note
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if aliases.first().note != self:
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raise ValidationError(_('This alias is already taken.'),
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code="same_alias")
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# Save note
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super().save(*args, **kwargs)
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else:
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# Alias does not exist yet, so check if it can exist
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a = Alias(name=str(self))
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a.clean()
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# Save note and alias
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super().save(*args, **kwargs)
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a.note = self
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a.save(force_insert=True)
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def clean(self, *args, **kwargs):
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"""
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Verify alias (simulate save)
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"""
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aliases = Alias.objects.filter(
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normalized_name=Alias.normalize(str(self)))
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if aliases.exists():
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# Alias exists, so check if it is linked to this note
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if aliases.first().note != self:
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raise ValidationError(_('This alias is already taken.'),
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code="same_alias", )
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else:
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# Alias does not exist yet, so check if it can exist
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a = Alias(name=str(self))
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a.clean()
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class NoteUser(Note):
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"""
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A :model:`note.Note` associated to an unique :model:`auth.User`.
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"""
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user = models.OneToOneField(
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settings.AUTH_USER_MODEL,
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on_delete=models.PROTECT,
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related_name='note',
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verbose_name=_('user'),
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)
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class Meta:
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verbose_name = _("one's note")
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verbose_name_plural = _("users note")
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def __str__(self):
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return str(self.user)
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def pretty(self):
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return _("%(user)s's note") % {'user': str(self.user)}
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def save(self, *args, **kwargs):
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if self.pk and self.balance < 0:
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old_note = NoteUser.objects.get(pk=self.pk)
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if old_note.balance >= 0:
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# Passage en négatif
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self.last_negative = timezone.now()
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self.send_mail_negative_balance()
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super().save(*args, **kwargs)
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def send_mail_negative_balance(self):
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plain_text = render_to_string("note/mails/negative_balance.txt", dict(note=self))
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html = render_to_string("note/mails/negative_balance.html", dict(note=self))
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self.user.email_user("[Note Kfet] Passage en négatif (compte n°{:d})"
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.format(self.user.pk), plain_text, html_message=html)
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class NoteClub(Note):
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"""
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A :model:`note.Note` associated to an unique :model:`member.Club`
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"""
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club = models.OneToOneField(
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'member.Club',
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on_delete=models.PROTECT,
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related_name='note',
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verbose_name=_('club'),
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)
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class Meta:
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verbose_name = _("club note")
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verbose_name_plural = _("clubs notes")
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def __str__(self):
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return str(self.club)
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def pretty(self):
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return _("Note of %(club)s club") % {'club': str(self.club)}
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class NoteSpecial(Note):
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"""
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A :model:`note.Note` for special accounts, where real money enter or leave the system
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- bank check
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- credit card
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- bank transfer
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- cash
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- refund
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This Type of Note is not associated to a :model:`auth.User` or :model:`member.Club` .
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"""
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special_type = models.CharField(
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verbose_name=_('type'),
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max_length=255,
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unique=True,
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)
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class Meta:
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verbose_name = _("special note")
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verbose_name_plural = _("special notes")
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def __str__(self):
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return self.special_type
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class Alias(models.Model):
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"""
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points toward a :model:`note.NoteUser` or :model;`note.NoteClub` instance.
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Alias are unique, but a :model:`note.NoteUser` or :model:`note.NoteClub` can
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have multiples aliases.
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Aliases name are also normalized, two differents :model:`note.Note` can not
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have the same normalized alias, to avoid confusion when referring orally to
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it.
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"""
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name = models.CharField(
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verbose_name=_('name'),
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max_length=255,
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unique=True,
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validators=[
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RegexValidator(
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regex=settings.ALIAS_VALIDATOR_REGEX,
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message=_('Invalid alias'),
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)
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] if settings.ALIAS_VALIDATOR_REGEX else [],
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)
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normalized_name = models.CharField(
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max_length=255,
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unique=True,
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default='',
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editable=False,
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)
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note = models.ForeignKey(
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Note,
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on_delete=models.PROTECT,
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)
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class Meta:
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verbose_name = _("alias")
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verbose_name_plural = _("aliases")
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indexes = [
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models.Index(fields=['name']),
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models.Index(fields=['normalized_name']),
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]
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def __str__(self):
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return self.name
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@staticmethod
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def normalize(string):
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"""
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Normalizes a string: removes most diacritics and does casefolding
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"""
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return ''.join(
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char for char in unicodedata.normalize('NFKD', string.casefold())
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if all(not unicodedata.category(char).startswith(cat)
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for cat in {'M', 'P', 'Z', 'C'})).casefold()
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def clean(self):
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normalized_name = self.normalize(self.name)
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if len(normalized_name) >= 255:
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raise ValidationError(_('Alias is too long.'),
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code='alias_too_long')
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try:
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sim_alias = Alias.objects.get(normalized_name=normalized_name)
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if self != sim_alias:
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raise ValidationError(_('An alias with a similar name already exists: {} ').format(sim_alias),
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code="same_alias"
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)
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except Alias.DoesNotExist:
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pass
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self.normalized_name = normalized_name
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def save(self, *args, **kwargs):
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self.normalized_name = self.normalize(self.name)
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super().save(*args, **kwargs)
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def delete(self, using=None, keep_parents=False):
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if self.name == str(self.note):
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raise ValidationError(_("You can't delete your main alias."),
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code="main_alias")
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return super().delete(using, keep_parents)
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