# -*- coding: utf-8 -*-
from __future__ import unicode_literals
import datetime
import logging
from django.core.exceptions import ValidationError
from django.db import models
from django.urls import reverse
from django.utils import timezone
from django.utils.encoding import python_2_unicode_compatible
from django.utils.translation import ugettext_lazy as _

from dav_base.validators import DAVNumberValidator
from dav_events.models.event import Event

from . import signals

logger = logging.getLogger(__name__)

midnight = datetime.time(00, 00, 00)


@python_2_unicode_compatible
class Registration(models.Model):
    event = models.ForeignKey(Event, related_name='registrations')
    created_at = models.DateTimeField(auto_now_add=True)

    personal_names = models.CharField(max_length=1024,
                                      verbose_name=_('Vorname(n)'))
    family_names = models.CharField(max_length=1024,
                                    verbose_name=_('Familienname'))

    address = models.CharField(max_length=1024,
                               verbose_name=_('Anschrift'),
                               help_text=_('Straße, Hausnummer'))
    postal_code = models.CharField(max_length=254,
                                   verbose_name=_('Postleitzahl'))
    city = models.CharField(max_length=1024,
                            verbose_name=_('Ort'))
    email_address = models.EmailField(verbose_name=_('E-Mail-Adresse'))
    phone_number = models.CharField(max_length=254,
                                    verbose_name=_('Telefonnummer'),
                                    help_text=_('Idealerweise eine Mobilfunk-Nummer'))
    dav_member = models.BooleanField(default=True,
                                     verbose_name=_('DAV Mitglied'))
    dav_number = models.CharField(max_length=62,
                                  blank=True, validators=[DAVNumberValidator],
                                  verbose_name=_('DAV Mitgliedsnummer'),
                                  help_text='%s<br /> %s %s' % (
                                      _('Deine Mitgliedsnummer findest du unter dem Strichcode'
                                        ' auf deinem DAV Ausweis.'),
                                      _('Beispiel: <tt>131/00/012345</tt>'),
                                      _('(der Teil bis zum ersten * genügt)'),
                                  ))
    emergency_contact = models.TextField(blank=True,
                                         verbose_name=_('Notfall-Kontakt'),
                                         help_text=_('Name und Telefonnummer bzw. Anschrift,'
                                                     ' die in Notfällen informiert werden soll.'))
    experience = models.TextField(blank=True,
                                  verbose_name=_('Erfahrung'),
                                  help_text=_('Welche Touren oder Kurse hast du bereits gemacht?'))
    note = models.TextField(blank=True,
                            verbose_name=_('Anmerkung'),
                            help_text='%s<br /> %s' % (
                                _('Wissenswertes für den Tourenleiter, z.B. Allergien,'
                                  ' gesundheitliche Einschränkungen, ...'),
                                _('Kann frei gelassen werden.'))
                            )

    privacy_policy = models.TextField(blank=True,
                                      verbose_name=_('Erklärung zur Datenspeicherung'))
    privacy_policy_accepted = models.BooleanField(default=False,
                                                  verbose_name=_('Einwilligung zur Datenspeicherung'))
    purge_at = models.DateTimeField(_('Zeitpunkt der Datenlöschung'))

    answered = models.BooleanField(_('Durch Tourleitung beantwortet'), default=False)

    @staticmethod
    def pk2hexstr(pk):
        return hex(pk * 113)[2:]  # 113 has no meaning, but it produce nice looking hex codes.

    @staticmethod
    def hexstr2pk(hexstr):
        return int('0x' + hexstr, 0) // 113

    @property
    def hexstr(self):
        if not self.pk:
            return None
        return self.pk2hexstr(self.pk)

    class Meta:
        verbose_name = _('Anmeldung')
        verbose_name_plural = _('Anmeldungen')
        ordering = ['created_at']

    def __str__(self):
        return '{eventnumber} - {name} ({registration_id} - {created} - {purge})'.format(
            eventnumber=self.event.get_number(),
            name=self.get_full_name(),
            registration_id=self.hexstr,
            created=self.created_at.strftime('%d.%m.%Y %H:%M %Z'),
            purge=self.purge_at.strftime('%d.%m.%Y %H:%M %Z')
        )

    def get_absolute_url(self):
        return reverse('dav_registration:registered')

    def get_full_name(self):
        return '{} {}'.format(self.personal_names, self.family_names)

    def get_info(self):
        text = """{fullname}
{address}, {postal_code} {city}

DAV Mitglied: {dav_info}

Erfahrung:
{experience}

Anmerkung:
{note}
"""
        if not self.dav_member:
            dav_info = _('Nein')
        else:
            dav_info = self.dav_number

        return text.format(
            fullname=self.get_full_name(),
            address=self.address,
            postal_code=self.postal_code,
            city=self.city,
            dav_info=dav_info,
            experience=self.experience,
            note=self.note,
        )

    def clean(self):
        if self.dav_member and not self.dav_number:
            raise ValidationError({'dav_number': _('Wenn du DAV Mitglied bist, brauchen wir deine Mitgliedsnummer.')})

    def save(self, **kwargs):
        creating = False
        if not self.id:
            creating = True

        if not self.purge_at and self.event:
            self.purge_at = self.__class__.calc_purge_at(self.event)

        self.full_clean()
        super(Registration, self).save(**kwargs)

        if creating:
            logger.info('Registration stored: %s', self)
            signals.registration_created.send(sender=self.__class__, registration=self)

    @classmethod
    def calc_purge_at(cls, event):
        if event.alt_last_day:
            last_day = event.alt_last_day
        elif event.last_day:
            last_day = event.last_day
        elif event.alt_first_day:
            last_day = event.alt_first_day
        else:
            last_day = event.first_day

        april = datetime.date(last_day.year, 4, 1)
        july = datetime.date(last_day.year, 7, 1)
        july_nextyear = datetime.date(last_day.year + 1, 7, 1)
        october = datetime.date(last_day.year, 10, 1)
        january_nextyear = datetime.date(last_day.year + 1, 1, 1)

        if last_day < april:
            purge_date = july
        elif last_day < october:
            purge_date = january_nextyear
        else:
            purge_date = july_nextyear

        return timezone.make_aware(datetime.datetime.combine(purge_date, midnight))