# -*- encoding: utf-8 -*-

from datetime import timedelta
from os import path
import random
import hashlib

from django.utils import timezone
from django.conf import settings
from django.contrib.auth.models import AbstractUser
from django.core.urlresolvers import reverse
from django.db import models
from django.utils.translation import ugettext as _
from . import PAID_MEMBERSHIP_GROUP
from easy_thumbnails.fields import ThumbnailerImageField
from utils import OverwriteStorage


GENDER_CHOICES = (
    ('m', _('Male')),
    ('f', _('Female')),
)


def get_upload_path(instance, filename):
    """
    Erstellt den Pfad und Dateinamen für den Upload dynmisch.

    @param instance: The Membership Object for the uploaded image
    @param filename: the filename of the uploaded image
    """
    extension = path.splitext(filename)[1]
    return 'membership/%s%s' % (instance.username, extension)


class ActivationManager(models.Manager):
    """
    Manages pending user registrations
    """

    def activate(self, activation_key):
        """
        searches the pending registrations for the given activation key.
        Set the corresponding user to active, if the key was found
        and the key has not expired yet.s

        @param activation_key: the key found in the activation email
        """
        try:
            activation_request = self.get(activation_key=activation_key)
            if activation_request.expired():
                activation_request.user.delete()
                activation_request.delete()
                return False
            elif not activation_request.user.is_active:
                activation_request.user.is_active = True
                activation_request.user.save()
                activation_request.delete()
            return activation_request.user
        except self.model.DoesNotExist:
            return False

    def create_pending_registration(self, user):
        """
        creates a PendingActivation instance with an random activation key.
        @param user: the user that requests activation.
        """
        salt = str(random.random())
        activation_key = hashlib.sha1(salt + user.username).hexdigest()

        return self.create(user=user, activation_key=activation_key)

    def expired(self):
        return self.filter(
            user__is_active=False,
            user__date_joined__lt=self.expiration_date
        )


class ActivationRequest(models.Model):
    """
    Each ActivationRequest contains an activation key and an user.
    The key will be send by email to the user
    if the user clicks on the link he can activate his in_active account.
    """
    user = models.OneToOneField(
        settings.AUTH_USER_MODEL,
        verbose_name=_('user')
    )
    activation_key = models.CharField(_('activation key'), max_length=40)
    objects = ActivationManager()

    class Meta:
        verbose_name = _('pending activation')
        verbose_name_plural = _('pending activations')

    def __unicode__(self):
        return _("user registration for %s") % self.user

    def activate(self):
        self.user.is_active = True
        self.user.save()
        self.delete()

    @property
    def expiration_date(self):
        timespan = timedelta(days=settings.ACCOUNT_ACTIVATION_DAYS)
        return self.user.date_joined + timespan

    @property
    def email(self):
        return self.user.email

    def expired(self):
        if self.user.is_active:
            return False
        elif timezone.now() >= self.expiration_date:
            return True
        else:
            return False

    expired.boolean = True

    @property
    def first_name(self):
        return self.user.first_name

    @property
    def last_name(self):
        return self.user.last_name

    @property
    def registration_date(self):
        return self.user.date_joined

    @property
    def username(self):
        return self.user.username


class Membership(AbstractUser):
    # user = models.OneToOneField(settings.AUTH_USER_MODEL)
    # nickname = models.SlugField(_('Nickname'), unique=True)
    gender = models.CharField(
        _("Gender"),
        max_length=1,
        choices=GENDER_CHOICES
    )
    # first_name = models.CharField(_("Given Name"), max_length=30)
    # last_name = models.CharField(_("Last Name"), max_length=30)
    # email = models.EmailField(_('Email'), unique=True)
    website = models.URLField(blank=True)
    avatar = ThumbnailerImageField(
        upload_to=get_upload_path,
        storage=OverwriteStorage(),
        blank=True,
        null=True
    )
    membership = models.BooleanField(
        _('Membership'),
        default=False,
        help_text=_('Yes, I confirm that I am in agreement with the statutes \
        and would like to become a member.')
    )
    birthday = models.DateField(_("Birthday Date"), blank=True, null=True)
    telephone = models.CharField(
        _("Telephone"),
        max_length=30,
        blank=True,
        null=True
    )
    street_name = models.CharField(
        _("Address"),
        max_length=75,
        blank=True,
        null=True
    )
    post_code = models.PositiveSmallIntegerField(
        _("Postcode"),
        blank=True,
        null=True
    )
    city = models.CharField(
        _("Town/City"),
        max_length=75,
        blank=True,
        null=True
    )
    deposit = models.PositiveSmallIntegerField(default=0, editable=False)
    registration_date = models.DateField(auto_now_add=True, editable=False)
    paid_until = models.DateField(
        _('Paid until'),
        blank=True,
        null=True,
        editable=True
    )
    confirmed = models.BooleanField(
        _('Confirmed'),
        default=False,
        help_text=_('This person has paid the membership fee.')
    )
    # comment = models.TextField(blank=True)
    # objects = MembershipManager()

    class Meta(object):
        ordering = ('username', )
        swappable = 'AUTH_USER_MODEL'
        verbose_name = _('Membership')
        verbose_name_plural = _('Memberships')

    def __unicode__(self):
        return self.username

    def get_absolute_url(self):
        return reverse(
            'membership-details',
            kwargs={'username': self.username}
        )

    def save(self, *args, **kwargs):
        super(Membership, self).save(*args, **kwargs)
        if self.confirmed:
            self.groups.add(PAID_MEMBERSHIP_GROUP)
        else:
            self.groups.remove(PAID_MEMBERSHIP_GROUP)