from django.shortcuts import render
from django.views.generic.edit import UpdateView, CreateView
from django.views.generic.base import View
from django.utils.translation import ugettext_lazy as _
from django.core.exceptions import PermissionDenied, ValidationError
from django.db import IntegrityError
from django import forms
from django.forms import Select
from django.conf import settings

from subscription.models import Subscriber, Subscription
from core.views import CanEditMixin, CanEditPropMixin, CanViewMixin
from core.models import User

def get_subscriber(user):
    s = Subscriber.objects.filter(pk=user.pk).first()
    return s

class SubscriptionForm(forms.ModelForm):
    class Meta:
        model = Subscription
        fields = ['member', 'subscription_type', 'payment_method']

    def __init__(self, *args, **kwargs):
        super(SubscriptionForm, self).__init__(*args, **kwargs)
        # Add fields to allow basic user creation
        self.fields['last_name'] = forms.CharField(max_length=User._meta.get_field('last_name').max_length)
        self.fields['first_name'] = forms.CharField(max_length=User._meta.get_field('first_name').max_length)
        self.fields['email'] = forms.EmailField()
        self.fields.move_to_end('subscription_type')
        self.fields.move_to_end('payment_method')

    def clean(self):
        cleaned_data = super(SubscriptionForm, self).clean()
        if (cleaned_data.get("member") is None
                and "last_name" not in self.errors.as_data()
                and "first_name" not in self.errors.as_data()
                and "email" not in self.errors.as_data()):
            self.errors.pop("member", None)
            if Subscriber.objects.filter(email=cleaned_data.get("email")).first() is not None:
                self.add_error("email", ValidationError(_("A user with that email address already exists")))
            else:
                u = Subscriber(last_name = self.cleaned_data.get("last_name"),
                        first_name = self.cleaned_data.get("first_name"),
                        email = self.cleaned_data.get("email"))
                u.generate_username()
                u.save()
                cleaned_data["member"] = u
        elif cleaned_data.get("member") is not None:
            self.errors.pop("last_name", None)
            self.errors.pop("first_name", None)
            self.errors.pop("email", None)
        if cleaned_data.get("member") is None:
            # This should be handled here, but it is done in the Subscription model's clean method
            # TODO investigate why!
            raise ValidationError(_("You must either choose an existing user or create a new one properly"))
        return cleaned_data

class NewSubscription(CanEditMixin, CreateView): # TODO: this must be able to create a new user if needed
    template_name = 'subscription/subscription.jinja'
    form_class = SubscriptionForm

    def get_initial(self):
        if 'member' in self.request.GET.keys():
            return {'member': self.request.GET['member']}
        return {}

    def form_valid(self, form):
        form.instance.subscription_start = Subscription.compute_start(
                duration=settings.SITH_SUBSCRIPTIONS[form.instance.subscription_type]['duration'])
        form.instance.subscription_end = Subscription.compute_end(
                duration=settings.SITH_SUBSCRIPTIONS[form.instance.subscription_type]['duration'],
                start=form.instance.subscription_start
                )
        return super(NewSubscription, self).form_valid(form)