717 lines
24 KiB
Python
717 lines
24 KiB
Python
# lingo - payment and billing system
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# Copyright (C) 2022 Entr'ouvert
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Affero General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import copy
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import dataclasses
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import datetime
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import decimal
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from typing import List
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from django.contrib.postgres.fields import JSONField
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from django.db import models
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from django.template import Context, RequestContext, Template, TemplateSyntaxError, VariableDoesNotExist
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from django.utils.text import slugify
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from django.utils.translation import ugettext_lazy as _
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from lingo.agendas.models import Agenda, CheckType
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from lingo.utils.misc import AgendaImportError, clean_import_data, generate_slug
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class PricingError(Exception):
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def __init__(self, details=None):
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self.details = details or {}
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super().__init__()
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class AgendaPricingNotFound(PricingError):
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pass
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class CriteriaConditionNotFound(PricingError):
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pass
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class MultipleDefaultCriteriaCondition(PricingError):
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pass
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class PricingDataError(PricingError):
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pass
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class PricingDataFormatError(PricingError):
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pass
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class PricingUnknownCheckStatusError(PricingError):
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pass
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class PricingEventNotCheckedError(PricingError):
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pass
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class PricingBookingNotCheckedError(PricingError):
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pass
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class PricingMultipleBookingError(PricingError):
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pass
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class PricingBookingCheckTypeError(PricingError):
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pass
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class CriteriaCategory(models.Model):
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label = models.CharField(_('Label'), max_length=150)
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slug = models.SlugField(_('Identifier'), max_length=160, unique=True)
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class Meta:
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ordering = ['label']
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def __str__(self):
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return self.label
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def save(self, *args, **kwargs):
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if not self.slug:
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self.slug = generate_slug(self)
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super().save(*args, **kwargs)
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@property
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def base_slug(self):
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return slugify(self.label)
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@classmethod
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def import_json(cls, data, overwrite=False):
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criterias = data.pop('criterias', [])
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data = clean_import_data(cls, data)
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category, created = cls.objects.update_or_create(slug=data['slug'], defaults=data)
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if overwrite:
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Criteria.objects.filter(category=category).delete()
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for criteria in criterias:
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criteria['category'] = category
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Criteria.import_json(criteria)
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return created, category
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def export_json(self):
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return {
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'label': self.label,
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'slug': self.slug,
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'criterias': [a.export_json() for a in self.criterias.all()],
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}
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class Criteria(models.Model):
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category = models.ForeignKey(
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CriteriaCategory, verbose_name=_('Category'), on_delete=models.CASCADE, related_name='criterias'
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)
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label = models.CharField(_('Label'), max_length=150)
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slug = models.SlugField(_('Identifier'), max_length=160)
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condition = models.CharField(_('Condition'), max_length=1000, blank=True)
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order = models.PositiveIntegerField()
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default = models.BooleanField(
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_('Default criteria'), default=False, help_text=_('Will be applied if no other criteria matches')
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)
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class Meta:
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ordering = ['default', 'order']
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unique_together = ['category', 'slug']
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def __str__(self):
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return self.label
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def save(self, *args, **kwargs):
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if self.default is True:
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self.order = 0
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elif self.order is None:
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max_order = (
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Criteria.objects.filter(category=self.category)
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.aggregate(models.Max('order'))
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.get('order__max')
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or 0
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)
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self.order = max_order + 1
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if not self.slug:
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self.slug = generate_slug(self, category=self.category)
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super().save(*args, **kwargs)
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@property
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def base_slug(self):
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return slugify(self.label)
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@classmethod
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def import_json(cls, data):
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data = clean_import_data(cls, data)
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cls.objects.update_or_create(slug=data['slug'], category=data['category'], defaults=data)
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def export_json(self):
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return {
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'label': self.label,
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'slug': self.slug,
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'condition': self.condition,
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'order': self.order,
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}
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@property
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def identifier(self):
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return '%s:%s' % (self.category.slug, self.slug)
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def compute_condition(self, context):
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try:
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template = Template('{%% if %s %%}OK{%% endif %%}' % self.condition)
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except TemplateSyntaxError:
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return False
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return template.render(Context(context)) == 'OK'
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class Pricing(models.Model):
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label = models.CharField(_('Label'), max_length=150)
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slug = models.SlugField(_('Identifier'), max_length=160, unique=True)
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categories = models.ManyToManyField(
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CriteriaCategory,
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related_name='pricings',
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through='PricingCriteriaCategory',
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)
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criterias = models.ManyToManyField(Criteria)
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extra_variables = JSONField(blank=True, default=dict)
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class Meta:
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ordering = ['label']
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def __str__(self):
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return self.label
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def save(self, *args, **kwargs):
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if not self.slug:
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self.slug = generate_slug(self)
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super().save(*args, **kwargs)
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@property
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def base_slug(self):
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return slugify(self.label)
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def get_extra_variables(self, request, original_context):
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result = {}
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context = RequestContext(request)
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context.push(original_context)
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for key, tplt in (self.extra_variables or {}).items():
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try:
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result[key] = Template(tplt).render(context)
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except (TemplateSyntaxError, VariableDoesNotExist):
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continue
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return result
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def get_extra_variables_keys(self):
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return sorted((self.extra_variables or {}).keys())
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@classmethod
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def import_json(cls, data, overwrite=False):
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data = data.copy()
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categories = data.pop('categories', [])
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categories_by_slug = {c.slug: c for c in CriteriaCategory.objects.all()}
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criterias_by_categories_and_slug = {
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(crit.category.slug, crit.slug): crit
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for crit in Criteria.objects.select_related('category').all()
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}
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for category_data in categories:
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category_slug = category_data['category']
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if category_data['category'] not in categories_by_slug:
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raise AgendaImportError(_('Missing "%s" pricing category') % category_data['category'])
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for criteria_slug in category_data['criterias']:
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if (category_slug, criteria_slug) not in criterias_by_categories_and_slug:
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raise AgendaImportError(
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_('Missing "%s" pricing criteria for "%s" category') % (criteria_slug, category_slug)
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)
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data = clean_import_data(cls, data)
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pricing, created = cls.objects.update_or_create(slug=data['slug'], defaults=data)
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PricingCriteriaCategory.objects.filter(pricing=pricing).delete()
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criterias = []
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for category_data in categories:
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pricing.categories.add(
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categories_by_slug[category_data['category']],
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through_defaults={'order': category_data['order']},
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)
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for criteria_slug in category_data['criterias']:
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criterias.append(criterias_by_categories_and_slug[(category_data['category'], criteria_slug)])
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pricing.criterias.set(criterias)
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return created, pricing
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def export_json(self):
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return {
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'label': self.label,
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'slug': self.slug,
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'extra_variables': self.extra_variables,
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'categories': [pcc.export_json() for pcc in PricingCriteriaCategory.objects.filter(pricing=self)],
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}
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def duplicate(self, label=None):
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# clone current pricing
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new_pricing = copy.deepcopy(self)
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new_pricing.pk = None
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new_pricing.label = label or _('Copy of %s') % self.label
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# reset slug
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new_pricing.slug = None
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new_pricing.save()
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# set criterias
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new_pricing.criterias.set(self.criterias.all())
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# set categories
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for pcc in PricingCriteriaCategory.objects.filter(pricing=self):
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pcc.duplicate(pricing_target=new_pricing)
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return new_pricing
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class PricingCriteriaCategory(models.Model):
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pricing = models.ForeignKey(Pricing, on_delete=models.CASCADE)
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category = models.ForeignKey(CriteriaCategory, on_delete=models.CASCADE)
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order = models.PositiveIntegerField()
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class Meta:
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ordering = ['order']
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unique_together = ['pricing', 'category']
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def save(self, *args, **kwargs):
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if self.order is None:
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max_order = (
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PricingCriteriaCategory.objects.filter(pricing=self.pricing)
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.aggregate(models.Max('order'))
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.get('order__max')
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or 0
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)
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self.order = max_order + 1
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super().save(*args, **kwargs)
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def export_json(self):
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return {
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'category': self.category.slug,
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'order': self.order,
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'criterias': [c.slug for c in self.pricing.criterias.all() if c.category == self.category],
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}
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def duplicate(self, pricing_target):
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new_pcc = copy.deepcopy(self)
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new_pcc.pk = None
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new_pcc.pricing = pricing_target
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new_pcc.save()
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return new_pcc
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@dataclasses.dataclass
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class PricingMatrixCell:
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criteria: Criteria
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value: decimal.Decimal
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@dataclasses.dataclass
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class PricingMatrixRow:
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criteria: Criteria
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cells: List[PricingMatrixCell]
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@dataclasses.dataclass
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class PricingMatrix:
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criteria: Criteria
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rows: List[PricingMatrixRow]
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class AgendaPricing(models.Model):
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label = models.CharField(_('Label'), max_length=150, null=True)
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slug = models.SlugField(_('Identifier'), max_length=160, null=True)
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agendas = models.ManyToManyField(Agenda, related_name='agendapricings')
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pricing = models.ForeignKey(Pricing, on_delete=models.CASCADE, verbose_name=_('Pricing model'))
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date_start = models.DateField(_('Start date'))
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date_end = models.DateField(_('End date'))
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flat_fee_schedule = models.BooleanField(_('Flat fee schedule'), default=False)
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subscription_required = models.BooleanField(_('Subscription is required'), default=True)
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pricing_data = JSONField(null=True)
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def __str__(self):
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return self.label or self.pricing.label
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def save(self, *args, **kwargs):
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if not self.slug:
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self.slug = generate_slug(self)
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super().save(*args, **kwargs)
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@property
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def base_slug(self):
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return slugify(self.label or self.pricing.label)
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def export_json(self):
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return {
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'label': self.label,
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'slug': self.slug,
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'pricing': self.pricing.slug,
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'date_start': self.date_start.strftime('%Y-%m-%d'),
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'date_end': self.date_end.strftime('%Y-%m-%d'),
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'pricing_data': self.pricing_data,
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'agendas': [a.slug for a in self.agendas.all()],
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'billing_dates': [bd.export_json() for bd in self.billingdates.all()],
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}
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@classmethod
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def import_json(cls, data, overwrite=False):
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data = copy.deepcopy(data)
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agenda_slugs = data.pop('agendas', None) or []
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billing_dates = data.pop('billing_dates', None) or []
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data = clean_import_data(cls, data)
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agendas = []
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for agenda_slug in agenda_slugs:
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try:
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agendas.append(Agenda.objects.get(slug=agenda_slug))
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except Agenda.DoesNotExist:
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raise AgendaImportError(_('Missing "%s" agenda') % agenda_slug)
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try:
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data['pricing'] = Pricing.objects.get(slug=data['pricing'])
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except Pricing.DoesNotExist:
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raise AgendaImportError(_('Missing "%s" pricing model') % data['pricing'])
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agenda_pricing, created = cls.objects.update_or_create(slug=data['slug'], defaults=data)
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if overwrite and not created:
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agenda_pricing.agendas.clear()
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agenda_pricing.agendas.add(*agendas)
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if overwrite and not created:
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agenda_pricing.billingdates.all().delete()
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for billing_date in billing_dates:
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billing_date['agenda_pricing'] = agenda_pricing
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BillingDate.import_json(billing_date)
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return created, agenda_pricing
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def get_pricing_data(self, request, pricing_date, user_external_id, adult_external_id, subscription=None):
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# compute pricing for flat_fee_schedule mode
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# subscription is None if subscription_required is False
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data = {
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'pricing_date': pricing_date, # date to use for QF
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'subscription': subscription,
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}
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context = self.get_pricing_context(
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request=request,
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data=data,
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user_external_id=user_external_id,
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adult_external_id=adult_external_id,
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)
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pricing, criterias = self.compute_pricing(context=context)
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return {
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'pricing': pricing,
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'calculation_details': {
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'pricing': pricing,
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'criterias': criterias,
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'context': context,
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},
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}
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def get_pricing_data_for_event(
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self, request, agenda, event, subscription, check_status, booking, user_external_id, adult_external_id
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):
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# compute pricing for an event
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event_date = datetime.datetime.fromisoformat(event['start_datetime']).date()
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data = {
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'pricing_date': event_date, # date to use for QF
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'event': event,
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'subscription': subscription,
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'booking': booking,
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}
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context = self.get_pricing_context(
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request=request,
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data=data,
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user_external_id=user_external_id,
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adult_external_id=adult_external_id,
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)
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pricing, criterias = self.compute_pricing(context=context)
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modifier = self.get_booking_modifier(agenda=agenda, check_status=check_status)
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return self.aggregate_pricing_data(
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pricing=pricing, criterias=criterias, context=context, modifier=modifier
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)
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def aggregate_pricing_data(self, pricing, criterias, context, modifier):
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if modifier['modifier_type'] == 'fixed':
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pricing_amount = modifier['modifier_fixed']
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else:
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pricing_amount = pricing * modifier['modifier_rate'] / 100
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return {
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'pricing': pricing_amount,
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'calculation_details': {
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'pricing': pricing,
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'criterias': criterias,
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'context': context,
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},
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'booking_details': modifier,
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}
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@staticmethod
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def get_agenda_pricing(agenda, start_date, flat_fee_schedule):
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try:
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return agenda.agendapricings.get(
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date_start__lte=start_date,
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date_end__gt=start_date,
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flat_fee_schedule=flat_fee_schedule,
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)
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except (AgendaPricing.DoesNotExist, AgendaPricing.MultipleObjectsReturned):
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raise AgendaPricingNotFound
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def get_pricing_context(self, request, data, user_external_id, adult_external_id):
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context = {'data': data, 'user_external_id': user_external_id, 'adult_external_id': adult_external_id}
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if ':' in user_external_id:
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context['user_external_raw_id'] = user_external_id.split(':')[1]
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if ':' in adult_external_id:
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context['adult_external_raw_id'] = adult_external_id.split(':')[1]
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return self.pricing.get_extra_variables(request, context)
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def format_pricing_data(self):
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# format data to ignore category ordering
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def _format(data):
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if not data:
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return
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if not isinstance(data, dict):
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yield [], data
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return
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for criteria, val in data.items():
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result = list(_format(val))
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for criterias, pricing in result:
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yield [criteria] + criterias, pricing
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return {
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self.format_pricing_data_key(criterias): pricing
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for criterias, pricing in _format(self.pricing_data)
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}
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def format_pricing_data_key(self, values):
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return '||'.join(sorted(values))
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def compute_pricing(self, context):
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criterias = {}
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categories = []
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# for each category (ordered)
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for category in self.pricing.categories.all().order_by('pricingcriteriacategory__order'):
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criterias[category.slug] = None
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categories.append(category.slug)
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# find the first matching criteria (criterias are ordered)
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for criteria in self.pricing.criterias.filter(category=category, default=False):
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condition = criteria.compute_condition(context)
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if condition:
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criterias[category.slug] = criteria.slug
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break
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if criterias[category.slug] is not None:
|
|
continue
|
|
# if no match, take default criteria if only once defined
|
|
default_criterias = self.pricing.criterias.filter(category=category, default=True)
|
|
if len(default_criterias) > 1:
|
|
raise MultipleDefaultCriteriaCondition(details={'category': category.slug})
|
|
if not default_criterias:
|
|
raise CriteriaConditionNotFound(details={'category': category.slug})
|
|
criterias[category.slug] = default_criterias[0].slug
|
|
|
|
# now search for pricing values matching found criterias
|
|
pricing_data = self.format_pricing_data()
|
|
pricing = pricing_data.get(
|
|
self.format_pricing_data_key(['%s:%s' % (k, v) for k, v in criterias.items()])
|
|
)
|
|
if pricing is None:
|
|
raise PricingDataError(details={'criterias': criterias})
|
|
|
|
try:
|
|
pricing = decimal.Decimal(pricing)
|
|
except (decimal.InvalidOperation, ValueError, TypeError):
|
|
raise PricingDataFormatError(details={'pricing': pricing, 'wanted': 'decimal'})
|
|
|
|
return pricing, criterias
|
|
|
|
def get_booking_modifier(self, agenda, check_status):
|
|
status = check_status['status']
|
|
if status not in ['error', 'not-booked', 'cancelled', 'presence', 'absence']:
|
|
raise PricingUnknownCheckStatusError
|
|
|
|
if status == 'error':
|
|
reason = check_status['error_reason']
|
|
# event must be checked
|
|
if reason == 'event-not-checked':
|
|
raise PricingEventNotCheckedError
|
|
# booking must be checked
|
|
if reason == 'booking-not-checked':
|
|
raise PricingBookingNotCheckedError
|
|
# too many bookings found
|
|
if reason == 'too-many-bookings-found':
|
|
raise PricingMultipleBookingError
|
|
|
|
# no booking found
|
|
if status == 'not-booked':
|
|
return {
|
|
'status': 'not-booked',
|
|
'modifier_type': 'rate',
|
|
'modifier_rate': 0,
|
|
}
|
|
|
|
# booking cancelled
|
|
if status == 'cancelled':
|
|
return {
|
|
'status': 'cancelled',
|
|
'modifier_type': 'rate',
|
|
'modifier_rate': 0,
|
|
}
|
|
|
|
# no check_type, default rates
|
|
if not check_status['check_type']:
|
|
return {
|
|
'status': status,
|
|
'check_type_group': None,
|
|
'check_type': None,
|
|
'modifier_type': 'rate',
|
|
'modifier_rate': 100 if status == 'presence' else 0,
|
|
}
|
|
|
|
try:
|
|
check_type = CheckType.objects.get(
|
|
group=agenda.check_type_group_id, slug=check_status['check_type']
|
|
)
|
|
except CheckType.DoesNotExist:
|
|
raise PricingBookingCheckTypeError(
|
|
details={
|
|
'reason': 'not-found',
|
|
}
|
|
)
|
|
# check_type kind and user_was_present mismatch
|
|
if check_type.kind != status:
|
|
raise PricingBookingCheckTypeError(
|
|
details={
|
|
'check_type_group': check_type.group.slug,
|
|
'check_type': check_type.slug,
|
|
'reason': 'wrong-kind',
|
|
}
|
|
)
|
|
|
|
# get pricing modifier
|
|
if check_type.pricing is not None:
|
|
return {
|
|
'status': status,
|
|
'check_type_group': check_type.group.slug,
|
|
'check_type': check_type.slug,
|
|
'modifier_type': 'fixed',
|
|
'modifier_fixed': check_type.pricing,
|
|
}
|
|
if check_type.pricing_rate is not None:
|
|
return {
|
|
'status': status,
|
|
'check_type_group': check_type.group.slug,
|
|
'check_type': check_type.slug,
|
|
'modifier_type': 'rate',
|
|
'modifier_rate': check_type.pricing_rate,
|
|
}
|
|
# pricing not found
|
|
raise PricingBookingCheckTypeError(
|
|
details={
|
|
'check_type_group': check_type.group.slug,
|
|
'check_type': check_type.slug,
|
|
'reason': 'not-configured',
|
|
}
|
|
)
|
|
|
|
def iter_pricing_matrix(self):
|
|
categories = self.pricing.categories.all().order_by('pricingcriteriacategory__order')[:3]
|
|
pricing_data = self.format_pricing_data()
|
|
|
|
if not categories:
|
|
return
|
|
|
|
if len(categories) < 3:
|
|
yield self.get_pricing_matrix(
|
|
main_criteria=None, categories=categories, pricing_data=pricing_data
|
|
)
|
|
return
|
|
|
|
# criterias are ordered
|
|
for criteria in self.pricing.criterias.all():
|
|
if criteria.category != categories[0]:
|
|
continue
|
|
yield self.get_pricing_matrix(
|
|
main_criteria=criteria,
|
|
categories=categories[1:],
|
|
pricing_data=pricing_data,
|
|
)
|
|
|
|
def get_pricing_matrix(self, main_criteria, categories, pricing_data):
|
|
matrix = PricingMatrix(
|
|
criteria=main_criteria,
|
|
rows=[],
|
|
)
|
|
|
|
def get_pricing_matrix_cell(criteria_2, criteria_3):
|
|
criterias = [main_criteria, criteria_2, criteria_3]
|
|
key = self.format_pricing_data_key([c.identifier for c in criterias if c])
|
|
try:
|
|
value = decimal.Decimal(str(pricing_data.get(key)))
|
|
except (decimal.InvalidOperation, ValueError, TypeError):
|
|
value = None
|
|
return PricingMatrixCell(criteria=criteria_2, value=value)
|
|
|
|
if len(categories) < 2:
|
|
criterias_2 = [None]
|
|
criterias_3 = [c for c in self.pricing.criterias.all() if c.category == categories[0]]
|
|
else:
|
|
criterias_2 = [c for c in self.pricing.criterias.all() if c.category == categories[0]]
|
|
criterias_3 = [c for c in self.pricing.criterias.all() if c.category == categories[1]]
|
|
|
|
rows = [
|
|
PricingMatrixRow(
|
|
criteria=criteria_3,
|
|
cells=[
|
|
get_pricing_matrix_cell(
|
|
criteria_2,
|
|
criteria_3,
|
|
)
|
|
for criteria_2 in criterias_2
|
|
],
|
|
)
|
|
for criteria_3 in criterias_3
|
|
]
|
|
matrix.rows = rows
|
|
|
|
return matrix
|
|
|
|
|
|
class BillingDate(models.Model):
|
|
agenda_pricing = models.ForeignKey(AgendaPricing, on_delete=models.CASCADE, related_name='billingdates')
|
|
date_start = models.DateField(_('Billing start date'))
|
|
label = models.CharField(_('Label'), max_length=150)
|
|
|
|
def __str__(self):
|
|
return '%s (%s)' % (self.date_start.strftime('%d/%m/%Y'), self.label)
|
|
|
|
def export_json(self):
|
|
return {
|
|
'date_start': self.date_start.strftime('%Y-%m-%d'),
|
|
'label': self.label,
|
|
}
|
|
|
|
@classmethod
|
|
def import_json(cls, data):
|
|
data = clean_import_data(cls, data)
|
|
cls.objects.update_or_create(
|
|
agenda_pricing=data['agenda_pricing'], date_start=data['date_start'], defaults=data
|
|
)
|