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 ajax_select.fields import AutoCompleteSelectField

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', 'location']
    member = AutoCompleteSelectField('users', required=False, help_text=None)

    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')
        self.fields.move_to_end('location')

    def clean_member(self):
        subscriber = self.cleaned_data.get("member")
        if subscriber:
            subscriber = Subscriber.objects.filter(id=subscriber.id).first()
        return subscriber

    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(CreateView):
    template_name = 'subscription/subscription.jinja'
    form_class = SubscriptionForm

    def dispatch(self, request, *arg, **kwargs):
        res = super(NewSubscription, self).dispatch(request, *arg, **kwargs)
        if request.user.is_in_group(settings.SITH_MAIN_BOARD_GROUP):
            return res
        raise PermissionDenied

    def get_initial(self):
        if 'member' in self.request.GET.keys():
            return {'member': self.request.GET['member'], 'subscription_type': 'deux-semestres'}
        return {'subscription_type': 'deux-semestres'}

    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)