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

from . import PAID_MEMBERSHIP_GROUP
from datetime import timedelta
from django.utils import timezone
from django.conf import settings
from django.contrib.auth.models import User
from django.core.exceptions import FieldError
from django.core.urlresolvers import reverse
from django.db import models
from django.utils.translation import ugettext as _
from imagekit.models import ImageSpecField
from imagekit.processors import SmartResize
from os import path
from utils import OverwriteStorage
import random
import hashlib

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.user.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.ForeignKey(User, unique=True, 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 MembershipManager(models.Manager):

    def get(self, *args, **kwargs):
        '''
        First try's to fetch the requested Membership Object from the Database,
        if the requestetd Membership does not Exists (yet) try to fetch the
        corresponding User, and create the Membership with the filled in
        Userdata.
        '''
        try:
            if 'username' in kwargs:
                return models.Manager.get(self,
                    user__username=kwargs['username']
                )
            else:
                return models.Manager.get(self, *args, **kwargs)
        except FieldError:
            user = User.objects.get(*args, **kwargs)
        except Membership.DoesNotExist:
            if 'user' in kwargs:
                user = User.objects.get(pk=kwargs['user'].id)
            else:
                user = User.objects.get(*args, **kwargs)

        membership = Membership(
            user=user,
            nickname=user.username,
            first_name=user.first_name,
            last_name=user.last_name,
            email=user.email
        )
        return membership


class Membership(models.Model):
    user = models.OneToOneField(User)
    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 = models.ImageField(
        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()

    thumbnail = ImageSpecField(
        processors=[SmartResize(width=60, height=60)],
        format='PNG',
        source='avatar',
    )

    profile = ImageSpecField(
        processors=[SmartResize(width=140, height=140)],
        format='PNG',
        source='avatar',
    )

    class Meta(object):
        ordering = ('last_name', 'first_name',)
        verbose_name = _('Membership')
        verbose_name_plural = _('Memberships')

    def __unicode__(self):
        return _('Userprofile for %s' % self.user.username)

    def clean(self):

        # Update the Profile Info from the User Object
        if not self.nickname:
            self.nickname = self.user.username
        if not self.first_name:
            self.first_name = self.user.first_name
        if not self.last_name:
            self.last_name = self.user.last_name
        if not self.email:
            self.email = self.user.email

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

    def save(self, *args, **kwargs):
        super(Membership, self).save(*args, **kwargs)
        self.user.username = self.nickname
        self.user.first_name = self.first_name
        self.user.last_name = self.last_name
        self.user.email = self.email

        if self.confirmed:
            self.user.groups.add(PAID_MEMBERSHIP_GROUP)
        else:
            self.user.groups.remove(PAID_MEMBERSHIP_GROUP)

        self.user.save()