#
# This file is part of pretix (Community Edition).
#
# Copyright (C) 2014-2020  Raphael Michel and contributors
# Copyright (C) 2020-today pretix GmbH and contributors
#
# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
# Public License as published by the Free Software Foundation in version 3 of the License.
#
# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
# this file, see <https://pretix.eu/about/en/license>.
#
# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
# <https://www.gnu.org/licenses/>.
#

# This file is based on an earlier version of pretix which was released under the Apache License 2.0. The full text of
# the Apache License 2.0 can be obtained at <http://www.apache.org/licenses/LICENSE-2.0>.
#
# This file may have since been changed and any changes are released under the terms of AGPLv3 as described above. A
# full history of changes and contributors is available at <https://github.com/pretix/pretix>.
#
# This file contains Apache-licensed contributions copyrighted by: Jan-Frederik Rieckers, Sohalt, Tobias Kunze
#
# Unless required by applicable law or agreed to in writing, software distributed under the Apache License 2.0 is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under the License.

from django import forms
from django.core.exceptions import ValidationError
from django.utils.formats import date_format
from django.utils.html import escape
from django.utils.safestring import mark_safe
from django.utils.translation import gettext_lazy as _
from phonenumber_field.formfields import PhoneNumberField

from pretix.base.forms.questions import (
    BaseInvoiceAddressForm, TicketLevelQuestionsForm,
    WrappedPhoneNumberPrefixWidget, guess_phone_prefix_from_request,
)
from pretix.base.templatetags.rich_text import rich_text
from pretix.base.validators import EmailBanlistValidator
from pretix.presale.signals import contact_form_fields


class ContactForm(forms.Form):
    required_css_class = 'required'
    email = forms.EmailField(label=_('Email'),
                             validators=[EmailBanlistValidator()],
                             widget=forms.EmailInput(attrs={'autocomplete': 'section-contact email'})
                             )

    def __init__(self, *args, **kwargs):
        self.event = kwargs.pop('event')
        self.request = kwargs.pop('request')
        self.all_optional = kwargs.pop('all_optional', False)
        super().__init__(*args, **kwargs)

        if self.event.settings.order_email_asked_twice:
            self.fields['email_repeat'] = forms.EmailField(
                label=_('Email address (repeated)'),
                help_text=_('Please enter the same email address again to make sure you typed it correctly.'),
            )

        if self.event.settings.order_phone_asked:
            if not self.initial.get('phone'):
                phone_prefix = guess_phone_prefix_from_request(self.request, self.event)
                if phone_prefix:
                    # We now exploit an implementation detail in PhoneNumberPrefixWidget to allow us to pass just
                    # a country code but no number as an initial value. It's a bit hacky, but should be stable for
                    # the future.
                    self.initial['phone'] = "+{}.".format(phone_prefix)

            self.fields['phone'] = PhoneNumberField(
                label=_('Phone number'),
                required=self.event.settings.order_phone_required,
                help_text=rich_text(self.event.settings.checkout_phone_helptext),
                widget=WrappedPhoneNumberPrefixWidget()
            )

        if not self.request.session.get('iframe_session', False):
            # There is a browser quirk in Chrome that leads to incorrect initial scrolling in iframes if there
            # is an autofocus field. Who would have thought… See e.g. here:
            # https://floatboxjs.com/forum/topic.php?post=8440&usebb_sid=2e116486a9ec6b7070e045aea8cded5b#post8440
            self.fields['email'].widget.attrs['autofocus'] = 'autofocus'
        self.fields['email'].help_text = rich_text(self.event.settings.checkout_email_helptext)

        responses = contact_form_fields.send(self.event, request=self.request)
        for r, response in responses:
            for key, value in response.items():
                # We need to be this explicit, since OrderedDict.update does not retain ordering
                self.fields[key] = value
        if self.all_optional:
            for k, v in self.fields.items():
                v.required = False
                v.widget.is_required = False

    def clean(self):
        if self.event.settings.order_email_asked_twice and self.cleaned_data.get('email') and self.cleaned_data.get('email_repeat'):
            if self.cleaned_data.get('email').lower() != self.cleaned_data.get('email_repeat').lower():
                raise ValidationError(_('Please enter the same email address twice.'))


class InvoiceAddressForm(BaseInvoiceAddressForm):
    required_css_class = 'required'
    vat_warning = True
    address_validation = True

    def __init__(self, *args, **kwargs):
        allow_save = kwargs.pop('allow_save', False)
        super().__init__(*args, **kwargs)
        if allow_save:
            self.fields['saved_id'] = forms.IntegerField(
                required=False,
                help_text=" ",  # non-breaking-space, will be overwritten by JavaScript, needed here for HTML-output
                label=_("Save to address"),
                widget=forms.Select(choices=(("", _("Create new address")),))
            )
            self.fields['save'] = forms.BooleanField(
                label=_('Save address in my customer account for future purchases'),
                required=False,
                initial=False,
            )


class InvoiceNameForm(InvoiceAddressForm):
    address_validation = False

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        for f in list(self.fields.keys()):
            if f != 'name_parts':
                del self.fields[f]


class CustomerAwareQuestionsForm(TicketLevelQuestionsForm):
    """
    The base class is responsible for asking order-related questions. This includes
    the attendee name for admission tickets, if the corresponding setting is enabled,
    as well as additional questions defined by the organizer.

    This class adds support for pre-filling data like name and address from a
    customer profile, in case the user is logged-in with a customer account.
    """
    required_css_class = 'required'
    address_validation = True

    def __init__(self, *args, **kwargs):
        allow_save = kwargs.pop('allow_save', False)
        super().__init__(*args, **kwargs)
        if allow_save and self.fields:
            self.fields['save'] = forms.BooleanField(
                label=_('Save answers to my customer profiles for future purchases'),
                required=False,
                initial=False,
            )
            self.fields['saved_id'] = forms.IntegerField(
                required=False,
                help_text=" ",  # non-breaking-space, will be overwritten by JavaScript, needed here for HTML-output
                label=_("Save to profile"),
                widget=forms.Select(choices=(("", _("Create new profile")),))
            )


class MembershipForm(forms.Form):
    required_css_class = 'required'

    def __init__(self, *args, **kwargs):
        self.memberships = kwargs.pop('memberships')
        event = kwargs.pop('event')
        self.position = kwargs.pop('position')

        super().__init__(*args, **kwargs)

        ev = self.position.subevent or event
        if self.position.variation and self.position.variation.require_membership:
            types = self.position.variation.require_membership_types.all()
        else:
            types = self.position.item.require_membership_types.all()

        memberships = [
            m for m in self.memberships
            if m.membership_type in types and (
                m.is_valid(ev, self.position.valid_from, valid_from_not_chosen=self.position.item.validity_dynamic_start_choice)
            )
        ]

        if len(memberships) == 1:
            self.initial['membership'] = str(memberships[0].pk)

        self.fields['membership'] = forms.ChoiceField(
            label=_('Membership'),
            choices=[
                (str(m.pk), self._label_from_instance(m))
                for m in memberships
            ],
            widget=forms.RadioSelect,
        )
        self.is_empty = not memberships

    def _label_from_instance(self, obj):
        ds = date_format(obj.date_start, 'SHORT_DATE_FORMAT')
        de = date_format(obj.date_end, 'SHORT_DATE_FORMAT')
        if obj.membership_type.max_usages is not None:
            usages = f'({obj.usages} / {obj.membership_type.max_usages})'
        else:
            usages = ''
        d = f'<strong>{escape(obj.membership_type)}</strong> {usages}<br>'
        if obj.attendee_name:
            d += f'{escape(obj.attendee_name)}<br>'
        d += f'<span class="text-muted">{ds} – {de}</span>'
        if obj.testmode:
            d += ' <span class="label label-warning">{}</span>'.format(_("TEST MODE"))
        return mark_safe(d)

    def clean(self):
        d = super().clean()
        if d.get('membership'):
            d['membership'] = [m for m in self.memberships if str(m.pk) == d['membership']][0]
        return d