464 lines
17 KiB
Python
464 lines
17 KiB
Python
import datetime
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from dateutil.relativedelta import relativedelta
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from functools import lru_cache
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from django.core.validators import ValidationError, RegexValidator
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from django.db import models
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from django.db.models import F, Sum
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from django.db.models.functions import Coalesce
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from django.template import loader, Context
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from django.utils import timezone, translation
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from django.utils.encoding import force_text
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from django.utils.functional import cached_property
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from django.utils.translation import ugettext_lazy as _
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from orchestra.contrib.accounts.models import Account
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from orchestra.contrib.contacts.models import Contact
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from orchestra.core import validators
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from orchestra.utils.html import html_to_pdf
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from . import settings
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class BillContact(models.Model):
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account = models.OneToOneField('accounts.Account', verbose_name=_("account"),
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related_name='billcontact')
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name = models.CharField(_("name"), max_length=256, blank=True,
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help_text=_("Account full name will be used when left blank."))
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address = models.TextField(_("address"))
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city = models.CharField(_("city"), max_length=128,
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default=settings.BILLS_CONTACT_DEFAULT_CITY)
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zipcode = models.CharField(_("zip code"), max_length=10,
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validators=[RegexValidator(r'^[0-9A-Z]{3,10}$', _("Enter a valid zipcode."))])
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country = models.CharField(_("country"), max_length=20,
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choices=settings.BILLS_CONTACT_COUNTRIES,
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default=settings.BILLS_CONTACT_DEFAULT_COUNTRY)
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vat = models.CharField(_("VAT number"), max_length=64)
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def __str__(self):
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return self.name
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def get_name(self):
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return self.name or self.account.get_full_name()
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def clean(self):
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self.vat = self.vat.strip()
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self.city = self.city.strip()
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validators.all_valid({
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'vat': (validators.validate_vat, self.vat, self.country),
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'zipcode': (validators.validate_zipcode, self.zipcode, self.country)
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})
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class BillManager(models.Manager):
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def get_queryset(self):
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queryset = super(BillManager, self).get_queryset()
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if self.model != Bill:
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bill_type = self.model.get_class_type()
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queryset = queryset.filter(type=bill_type)
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return queryset
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class Bill(models.Model):
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OPEN = ''
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CREATED = 'CREATED'
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PROCESSED = 'PROCESSED'
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AMENDED = 'AMENDED'
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PAID = 'PAID'
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EXECUTED = 'EXECUTED'
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BAD_DEBT = 'BAD_DEBT'
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INCOMPLETE = 'INCOMPLETE'
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PAYMENT_STATES = (
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(OPEN, _("Open")),
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(CREATED, _("Created")),
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(PROCESSED, _("Processed")),
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(AMENDED, _("Amended")),
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(PAID, _("Paid")),
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(INCOMPLETE, _('Incomplete')),
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(EXECUTED, _("Executed")),
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(BAD_DEBT, _("Bad debt")),
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)
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BILL = 'BILL'
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INVOICE = 'INVOICE'
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AMENDMENTINVOICE = 'AMENDMENTINVOICE'
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FEE = 'FEE'
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AMENDMENTFEE = 'AMENDMENTFEE'
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PROFORMA = 'PROFORMA'
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TYPES = (
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(INVOICE, _("Invoice")),
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(AMENDMENTINVOICE, _("Amendment invoice")),
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(FEE, _("Fee")),
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(AMENDMENTFEE, _("Amendment Fee")),
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(PROFORMA, _("Pro forma")),
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)
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AMEND_MAP = {
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INVOICE: AMENDMENTINVOICE,
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FEE: AMENDMENTFEE,
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}
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number = models.CharField(_("number"), max_length=16, unique=True, blank=True)
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account = models.ForeignKey('accounts.Account', verbose_name=_("account"),
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related_name='%(class)s')
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amend_of = models.ForeignKey('self', null=True, blank=True, verbose_name=_("amend of"),
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related_name='amends')
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type = models.CharField(_("type"), max_length=16, choices=TYPES)
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created_on = models.DateField(_("created on"), auto_now_add=True)
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closed_on = models.DateField(_("closed on"), blank=True, null=True, db_index=True)
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is_open = models.BooleanField(_("open"), default=True)
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is_sent = models.BooleanField(_("sent"), default=False)
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due_on = models.DateField(_("due on"), null=True, blank=True)
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updated_on = models.DateField(_("updated on"), auto_now=True)
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# total = models.DecimalField(max_digits=12, decimal_places=2, null=True)
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comments = models.TextField(_("comments"), blank=True)
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html = models.TextField(_("HTML"), blank=True)
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objects = BillManager()
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class Meta:
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get_latest_by = 'id'
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def __str__(self):
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return self.number
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@classmethod
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def get_class_type(cls):
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return cls.__name__.upper()
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@cached_property
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def total(self):
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return self.compute_total()
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@cached_property
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def seller(self):
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return Account.objects.get_main().billcontact
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@cached_property
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def buyer(self):
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return self.account.billcontact
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@property
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def has_multiple_pages(self):
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return self.type != self.FEE
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@cached_property
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def payment_state(self):
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if self.is_open or self.get_type() == self.PROFORMA:
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return self.OPEN
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secured = 0
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pending = 0
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created = False
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processed = False
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executed = False
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rejected = False
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for transaction in self.transactions.all():
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if transaction.state == transaction.SECURED:
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secured += transaction.amount
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pending += transaction.amount
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elif transaction.state == transaction.WAITTING_PROCESSING:
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pending += transaction.amount
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created = True
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elif transaction.state == transaction.WAITTING_EXECUTION:
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pending += transaction.amount
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processed = True
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elif transaction.state == transaction.EXECUTED:
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pending += transaction.amount
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executed = True
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elif transaction.state == transaction.REJECTED:
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rejected = True
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else:
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raise TypeError("Unknown state")
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ongoing = bool(secured != 0 or created or processed or executed)
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total = self.compute_total()
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if total >= 0:
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if secured >= total:
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return self.PAID
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elif ongoing and pending < total:
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return self.INCOMPLETE
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else:
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if secured <= total:
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return self.PAID
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elif ongoing and pending > total:
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return self.INCOMPLETE
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if created:
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return self.CREATED
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elif processed:
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return self.PROCESSED
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elif executed:
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return self.EXECUTED
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return self.BAD_DEBT
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def clean(self):
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if self.amend_of_id:
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errors = {}
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if self.type not in self.AMEND_MAP.values():
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errors['amend_of'] = _("Type %s is not an amendment.") % self.get_type_display()
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if self.amend_of.account_id != self.account_id:
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errors['account'] = _("Amend of related account doesn't match bill account.")
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if self.amend_of.is_open:
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errors['amend_of'] = _("Related invoice is in open state.")
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if self.amend_of.type in self.AMEND_MAP.values():
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errors['amend_of'] = _("Related invoice is an amendment.")
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if errors:
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raise ValidationError(errors)
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def get_payment_state_display(self):
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value = self.payment_state
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return force_text(dict(self.PAYMENT_STATES).get(value, value))
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def get_current_transaction(self):
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return self.transactions.exclude_rejected().first()
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def get_type(self):
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return self.type or self.get_class_type()
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def get_amend_type(self):
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amend_type = self.AMEND_MAP.get(self.type)
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if amend_type is None:
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raise TypeError("%s has no associated amend type." % self.type)
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return amend_type
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def get_number(self):
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cls = type(self)
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bill_type = self.get_type()
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if bill_type == self.BILL:
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raise TypeError('This method can not be used on BILL instances')
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bill_type = bill_type.replace('AMENDMENT', 'AMENDMENT_')
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prefix = getattr(settings, 'BILLS_%s_NUMBER_PREFIX' % bill_type)
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if self.is_open:
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prefix = 'O{}'.format(prefix)
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bills = cls.objects.filter(number__regex=r'^%s[1-9]+' % prefix)
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last_number = bills.order_by('-number').values_list('number', flat=True).first()
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if last_number is None:
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last_number = 0
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else:
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last_number = int(last_number[len(prefix)+4:])
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number = last_number + 1
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year = timezone.now().strftime("%Y")
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number_length = settings.BILLS_NUMBER_LENGTH
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zeros = (number_length - len(str(number))) * '0'
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number = zeros + str(number)
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return '{prefix}{year}{number}'.format(prefix=prefix, year=year, number=number)
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def get_due_date(self, payment=None):
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now = timezone.now()
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if payment:
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return now + payment.get_due_delta()
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return now + relativedelta(months=1)
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def close(self, payment=False):
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if not self.is_open:
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raise TypeError("Bill not in Open state.")
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if payment is False:
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payment = self.account.paymentsources.get_default()
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if not self.due_on:
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self.due_on = self.get_due_date(payment=payment)
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total = self.compute_total()
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transaction = None
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if self.get_type() != self.PROFORMA:
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transaction = self.transactions.create(bill=self, source=payment, amount=total)
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self.closed_on = timezone.now()
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self.is_open = False
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self.is_sent = False
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self.number = self.get_number()
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self.html = self.render(payment=payment)
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self.save()
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return transaction
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def send(self):
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pdf = self.as_pdf()
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self.account.send_email(
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template=settings.BILLS_EMAIL_NOTIFICATION_TEMPLATE,
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context={
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'bill': self,
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'settings': settings,
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},
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email_from=settings.BILLS_SELLER_EMAIL,
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contacts=(Contact.BILLING,),
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attachments=[
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('%s.pdf' % self.number, pdf, 'application/pdf')
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]
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)
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self.is_sent = True
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self.save(update_fields=['is_sent'])
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def render(self, payment=False, language=None):
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with translation.override(language or self.account.language):
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if payment is False:
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payment = self.account.paymentsources.get_default()
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context = Context({
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'bill': self,
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'lines': self.lines.all().prefetch_related('sublines'),
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'seller': self.seller,
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'buyer': self.buyer,
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'seller_info': {
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'phone': settings.BILLS_SELLER_PHONE,
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'website': settings.BILLS_SELLER_WEBSITE,
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'email': settings.BILLS_SELLER_EMAIL,
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'bank_account': settings.BILLS_SELLER_BANK_ACCOUNT,
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},
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'currency': settings.BILLS_CURRENCY,
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'payment': payment and payment.get_bill_context(),
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'default_due_date': self.get_due_date(payment=payment),
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'now': timezone.now(),
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})
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template_name = 'BILLS_%s_TEMPLATE' % self.get_type()
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template = getattr(settings, template_name, settings.BILLS_DEFAULT_TEMPLATE)
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bill_template = loader.get_template(template)
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html = bill_template.render(context)
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html = html.replace('-pageskip-', '<pdf:nextpage />')
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return html
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def as_pdf(self):
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html = self.html or self.render()
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return html_to_pdf(html, pagination=self.has_multiple_pages)
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def save(self, *args, **kwargs):
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if not self.type:
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self.type = self.get_type()
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if not self.number:
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self.number = self.get_number()
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super(Bill, self).save(*args, **kwargs)
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@lru_cache()
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def compute_subtotals(self):
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subtotals = {}
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lines = self.lines.annotate(totals=F('subtotal') + Sum(Coalesce('sublines__total', 0)))
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for tax, total in lines.values_list('tax', 'totals'):
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try:
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subtotals[tax] += total
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except KeyError:
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subtotals[tax] = total
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result = {}
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for tax, subtotal in subtotals.items():
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result[tax] = [subtotal, round(tax/100*subtotal, 2)]
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return result
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@lru_cache()
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def compute_base(self):
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bases = self.lines.annotate(
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bases=F('subtotal') + Sum(Coalesce('sublines__total', 0))
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)
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return round(bases.aggregate(Sum('bases'))['bases__sum'] or 0, 2)
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@lru_cache()
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def compute_tax(self):
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taxes = self.lines.annotate(
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taxes=(F('subtotal') + Coalesce(Sum('sublines__total'), 0)) * (F('tax')/100)
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)
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return round(taxes.aggregate(Sum('taxes'))['taxes__sum'] or 0, 2)
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@lru_cache()
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def compute_total(self):
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if 'lines' in getattr(self, '_prefetched_objects_cache', ()):
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total = 0
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for line in self.lines.all():
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line_total = line.compute_total()
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total += line_total * (1+line.tax/100)
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return round(total, 2)
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else:
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totals = self.lines.annotate(
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totals=(F('subtotal') + Sum(Coalesce('sublines__total', 0))) * (1+F('tax')/100)
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)
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return round(totals.aggregate(Sum('totals'))['totals__sum'] or 0, 2)
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class Invoice(Bill):
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class Meta:
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proxy = True
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class AmendmentInvoice(Bill):
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class Meta:
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proxy = True
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class Fee(Bill):
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class Meta:
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proxy = True
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class AmendmentFee(Bill):
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class Meta:
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proxy = True
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class ProForma(Bill):
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class Meta:
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proxy = True
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class BillLine(models.Model):
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""" Base model for bill item representation """
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bill = models.ForeignKey(Bill, verbose_name=_("bill"), related_name='lines')
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description = models.CharField(_("description"), max_length=256)
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rate = models.DecimalField(_("rate"), blank=True, null=True, max_digits=12, decimal_places=2)
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quantity = models.DecimalField(_("quantity"), blank=True, null=True, max_digits=12,
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decimal_places=2)
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verbose_quantity = models.CharField(_("Verbose quantity"), max_length=16)
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subtotal = models.DecimalField(_("subtotal"), max_digits=12, decimal_places=2)
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tax = models.DecimalField(_("tax"), max_digits=4, decimal_places=2)
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start_on = models.DateField(_("start"))
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end_on = models.DateField(_("end"), null=True, blank=True)
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order = models.ForeignKey(settings.BILLS_ORDER_MODEL, null=True, blank=True,
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help_text=_("Informative link back to the order"), on_delete=models.SET_NULL)
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order_billed_on = models.DateField(_("order billed"), null=True, blank=True)
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order_billed_until = models.DateField(_("order billed until"), null=True, blank=True)
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created_on = models.DateField(_("created"), auto_now_add=True)
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# Amendment
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amended_line = models.ForeignKey('self', verbose_name=_("amended line"),
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related_name='amendment_lines', null=True, blank=True)
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def __str__(self):
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return "#%i" % self.pk
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def get_verbose_quantity(self):
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return self.verbose_quantity or self.quantity
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def get_verbose_period(self):
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from django.template.defaultfilters import date
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date_format = "N 'y"
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if self.start_on.day != 1 or self.end_on.day != 1:
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date_format = "N j, 'y"
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end = date(self.end_on, date_format)
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else:
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end = date((self.end_on - datetime.timedelta(days=1)), date_format)
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ini = date(self.start_on, date_format).capitalize()
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end = end.capitalize()
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if not self.end_on:
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return ini
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if ini == end:
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return ini
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return "{ini} / {end}".format(ini=ini, end=end)
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@lru_cache()
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def compute_total(self):
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total = self.subtotal or 0
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if hasattr(self, 'subline_total'):
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total += self.subline_total or 0
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elif 'sublines' in getattr(self, '_prefetched_objects_cache', ()):
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total += sum(subline.total for subline in self.sublines.all())
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else:
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total += self.sublines.aggregate(sub_total=Sum('total'))['sub_total'] or 0
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return round(total, 2)
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class BillSubline(models.Model):
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""" Subline used for describing an item discount """
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VOLUME = 'VOLUME'
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COMPENSATION = 'COMPENSATION'
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OTHER = 'OTHER'
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TYPES = (
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(VOLUME, _("Volume")),
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(COMPENSATION, _("Compensation")),
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(OTHER, _("Other")),
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)
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# TODO: order info for undoing
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line = models.ForeignKey(BillLine, verbose_name=_("bill line"), related_name='sublines')
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description = models.CharField(_("description"), max_length=256)
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total = models.DecimalField(max_digits=12, decimal_places=2)
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type = models.CharField(_("type"), max_length=16, choices=TYPES, default=OTHER)
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def __str__(self):
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return "%s %i" % (self.description, self.total)
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