from django import forms
from django.core.exceptions import ValidationError
from django.utils.translation import ugettext_lazy as _

from pretix.base.forms import I18nModelForm
from pretix.base.models import Organizer, Team
from pretix.multidomain.models import KnownDomain


class OrganizerForm(I18nModelForm):
    error_messages = {
        'duplicate_slug': _("This slug is already in use. Please choose a different one."),
    }

    class Meta:
        model = Organizer
        fields = ['name', 'slug']

    def clean_slug(self):
        slug = self.cleaned_data['slug']
        if Organizer.objects.filter(slug=slug).exists():
            raise forms.ValidationError(
                self.error_messages['duplicate_slug'],
                code='duplicate_slug',
            )
        return slug


class OrganizerUpdateForm(OrganizerForm):

    def __init__(self, *args, **kwargs):
        self.domain = kwargs.pop('domain', False)
        kwargs.setdefault('initial', {})
        self.instance = kwargs['instance']
        if self.domain and self.instance:
            initial_domain = self.instance.domains.first()
            if initial_domain:
                kwargs['initial'].setdefault('domain', initial_domain.domainname)

        super().__init__(*args, **kwargs)
        self.fields['slug'].widget.attrs['readonly'] = 'readonly'
        if self.domain:
            self.fields['domain'] = forms.CharField(
                max_length=255,
                label=_('Custom domain'),
                required=False,
                help_text=_('You need to configure the custom domain in the webserver beforehand.')
            )

    def clean_slug(self):
        return self.instance.slug

    def save(self, commit=True):
        instance = super().save(commit)

        if self.domain:
            current_domain = instance.domains.first()
            if self.cleaned_data['domain']:
                if current_domain and current_domain.domainname != self.cleaned_data['domain']:
                    current_domain.delete()
                    KnownDomain.objects.create(organizer=instance, domainname=self.cleaned_data['domain'])
                elif not current_domain:
                    KnownDomain.objects.create(organizer=instance, domainname=self.cleaned_data['domain'])
            elif current_domain:
                current_domain.delete()
            instance.get_cache().clear()

        return instance


class TeamForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        organizer = kwargs.pop('organizer')
        super().__init__(*args, **kwargs)
        self.fields['limit_events'].queryset = organizer.events.all()

    class Meta:
        model = Team
        fields = ['name', 'all_events', 'limit_events', 'can_create_events',
                  'can_change_teams', 'can_change_organizer_settings',
                  'can_change_event_settings', 'can_change_items',
                  'can_view_orders', 'can_change_orders',
                  'can_view_vouchers', 'can_change_vouchers']
        widgets = {
            'limit_events': forms.CheckboxSelectMultiple(attrs={
                'data-inverse-dependency': '#id_all_events'
            }),
        }

    def clean(self):
        data = super().clean()
        if self.instance.pk and not data['can_change_teams']:
            if not self.instance.organizer.teams.exclude(pk=self.instance.pk).filter(
                can_change_teams=True, members__isnull=False
            ).exists():
                raise ValidationError(_('The changes could not be saved because there would be no remaining team with '
                                        'the permission to change teams and permissions.'))

        return data