# lingo - payment and billing system
# Copyright (C) 2022  Entr'ouvert
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import copy

from django.conf import settings
from django.db import models
from django.utils.text import slugify
from django.utils.translation import gettext_lazy as _

from lingo.utils.misc import LingoImportError, clean_import_data, generate_slug


class Agenda(models.Model):
    label = models.CharField(_('Label'), max_length=150)
    slug = models.SlugField(_('Identifier'), max_length=160, unique=True)
    category_label = models.CharField(_('Category label'), max_length=150, null=True)
    category_slug = models.SlugField(_('Category identifier'), max_length=160, null=True)
    check_type_group = models.ForeignKey(
        'CheckTypeGroup',
        verbose_name=_('Check type group'),
        blank=True,
        null=True,
        on_delete=models.SET_NULL,
    )
    regie = models.ForeignKey(
        'invoicing.Regie',
        verbose_name=_('Regie'),
        blank=True,
        null=True,
        on_delete=models.SET_NULL,
    )

    class Meta:
        ordering = ['label']

    def __str__(self):
        return self.label

    def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = generate_slug(self)
        super().save(*args, **kwargs)

    @property
    def base_slug(self):
        return slugify(self.label)

    def export_json(self):
        return {
            'slug': self.slug,
            'check_type_group': self.check_type_group.slug if self.check_type_group else None,
        }

    @classmethod
    def import_json(cls, data):
        data = copy.deepcopy(data)
        try:
            agenda = Agenda.objects.get(slug=data['slug'])
        except Agenda.DoesNotExist:
            raise LingoImportError(_('Missing "%s" agenda') % data['slug'])
        if data.get('check_type_group'):
            try:
                data['check_type_group'] = CheckTypeGroup.objects.get(slug=data['check_type_group'])
            except CheckTypeGroup.DoesNotExist:
                raise LingoImportError(_('Missing "%s" check type group') % data['check_type_group'])

        agenda.check_type_group = data.get('check_type_group')
        agenda.save()

        return False, agenda

    def get_chrono_url(self):
        if not settings.KNOWN_SERVICES.get('chrono'):
            return
        chrono = list(settings.KNOWN_SERVICES['chrono'].values())[0]
        chrono_url = chrono.get('url') or ''
        return '%smanage/agendas/%s/settings/' % (chrono_url, self.slug)


class CheckTypeGroup(models.Model):
    slug = models.SlugField(_('Identifier'), max_length=160, unique=True)
    label = models.CharField(_('Label'), max_length=150)

    class Meta:
        ordering = ['label']

    def __str__(self):
        return self.label

    def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = generate_slug(self)
        super().save(*args, **kwargs)

    @property
    def base_slug(self):
        return slugify(self.label)

    @classmethod
    def import_json(cls, data):
        check_types = data.pop('check_types', [])
        data = clean_import_data(cls, data)
        group, created = cls.objects.update_or_create(slug=data['slug'], defaults=data)

        for check_type in check_types:
            check_type['group'] = group
            CheckType.import_json(check_type)

        return created, group

    def export_json(self):
        return {
            'label': self.label,
            'slug': self.slug,
            'check_types': [a.export_json() for a in self.check_types.all()],
        }


class CheckTypeManager(models.Manager):
    def absences(self):
        return self.filter(kind='absence', disabled=False)

    def presences(self):
        return self.filter(kind='presence', disabled=False)


class CheckType(models.Model):
    group = models.ForeignKey(CheckTypeGroup, on_delete=models.CASCADE, related_name='check_types')
    slug = models.SlugField(_('Identifier'), max_length=160)
    label = models.CharField(_('Label'), max_length=150)
    kind = models.CharField(
        _('Kind'),
        max_length=8,
        choices=[('absence', _('Absence')), ('presence', _('Presence'))],
        default='absence',
    )
    pricing = models.DecimalField(
        _('Pricing'), max_digits=5, decimal_places=2, help_text=_('Fixed pricing'), blank=True, null=True
    )
    pricing_rate = models.PositiveIntegerField(
        _('Pricing rate'), help_text=_('Percentage rate'), blank=True, null=True
    )
    disabled = models.BooleanField(_('Disabled'), default=False)
    objects = CheckTypeManager()

    class Meta:
        ordering = ['label']
        unique_together = ['group', 'slug']

    def __str__(self):
        return self.label

    def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = generate_slug(self, group=self.group)
        super().save(*args, **kwargs)

    @property
    def base_slug(self):
        return slugify(self.label)

    @classmethod
    def import_json(cls, data):
        data = clean_import_data(cls, data)
        cls.objects.update_or_create(slug=data['slug'], group=data['group'], defaults=data)

    def export_json(self):
        return {
            'label': self.label,
            'slug': self.slug,
            'kind': self.kind,
        }