import json
import textwrap
from collections import OrderedDict

from django import forms
from django.core.exceptions import ValidationError
from django.http import HttpRequest
from django.template.loader import get_template
from django.utils.translation import gettext_lazy as _
from i18nfield.fields import I18nFormField, I18nTextarea
from i18nfield.forms import I18nTextInput
from i18nfield.strings import LazyI18nString
from localflavor.generic.forms import BICFormField, IBANFormField

from pretix.base.models import OrderPayment
from pretix.base.payment import BasePaymentProvider


class BankTransfer(BasePaymentProvider):
    identifier = 'banktransfer'
    verbose_name = _('Bank transfer')
    abort_pending_allowed = True

    @staticmethod
    def form_fields():
        return OrderedDict([
            ('ack',
             forms.BooleanField(
                 label=_('I have understood that people will pay the ticket price directly to my bank account and '
                         'pretix cannot automatically know what payments arrived. Therefore, I will either mark '
                         'payments as complete manually, or regularly import a digital bank statement in order to '
                         'give pretix the required information.'),
                 required=True,
             )),
            ('bank_details_type', forms.ChoiceField(
                label=_('Bank account type'),
                widget=forms.RadioSelect,
                choices=(
                    ('sepa', _('SEPA bank account')),
                    ('other', _('Other bank account')),
                ),
                initial='sepa'
            )),
            ('bank_details_sepa_name', forms.CharField(
                label=_('Name of account holder'),
                widget=forms.TextInput(
                    attrs={
                        'data-display-dependency': '#id_payment_banktransfer_bank_details_type_0',
                        'data-required-if': '#id_payment_banktransfer_bank_details_type_0'
                    }
                ),
                required=False
            )),
            ('bank_details_sepa_iban', IBANFormField(
                label=_('IBAN'),
                required=False,
                widget=forms.TextInput(
                    attrs={
                        'data-display-dependency': '#id_payment_banktransfer_bank_details_type_0',
                        'data-required-if': '#id_payment_banktransfer_bank_details_type_0'
                    }
                ),
            )),
            ('bank_details_sepa_bic', BICFormField(
                label=_('BIC'),
                widget=forms.TextInput(
                    attrs={
                        'data-display-dependency': '#id_payment_banktransfer_bank_details_type_0',
                        'data-required-if': '#id_payment_banktransfer_bank_details_type_0'
                    }
                ),
                required=False
            )),
            ('bank_details_sepa_bank', forms.CharField(
                label=_('Name of bank'),
                widget=forms.TextInput(
                    attrs={
                        'data-display-dependency': '#id_payment_banktransfer_bank_details_type_0',
                        'data-required-if': '#id_payment_banktransfer_bank_details_type_0'
                    }
                ),
                required=False
            )),
            ('bank_details', I18nFormField(
                label=_('Bank account details'),
                widget=I18nTextarea,
                help_text=_(
                    'Include everything else that your customers might need to send you a bank transfer payment. '
                    'If you have lots of international customers, they might need your full address and your '
                    'bank\'s full address.'),
                widget_kwargs={'attrs': {
                    'rows': '4',
                    'placeholder': _(
                        'For SEPA accounts, you can leave this empty. Otherwise, please add everything that '
                        'your customers need to transfer the money, e.g. account numbers, routing numbers, '
                        'addresses, etc.'
                    ),
                }},
                required=False
            )),
            ('public_name', I18nFormField(
                label=_('Payment method name'),
                widget=I18nTextInput,
                required=False
            )),
            ('omit_hyphen', forms.BooleanField(
                label=_('Do not include a hyphen in the payment reference.'),
                help_text=_('This is required in some countries.'),
                required=False
            )),
        ])

    @property
    def public_name(self):
        return str(self.settings.get('public_name', as_type=LazyI18nString) or self.verbose_name)

    @property
    def test_mode_message(self):
        return _('In test mode, you can just manually mark this order as paid in the backend after it has been '
                 'created.')

    @property
    def settings_form_fields(self):
        d = OrderedDict(list(super().settings_form_fields.items()) + list(BankTransfer.form_fields().items()))
        d.move_to_end('bank_details', last=False)
        d.move_to_end('bank_details_sepa_bank', last=False)
        d.move_to_end('bank_details_sepa_bic', last=False)
        d.move_to_end('bank_details_sepa_iban', last=False)
        d.move_to_end('bank_details_sepa_name', last=False)
        d.move_to_end('bank_details_type', last=False)
        d.move_to_end('ack', last=False)
        d.move_to_end('_enabled', last=False)
        return d

    def settings_form_clean(self, cleaned_data):
        if cleaned_data.get('payment_banktransfer_bank_details_type') == 'sepa':
            for f in (
                    'bank_details_sepa_name', 'bank_details_sepa_bank', 'bank_details_sepa_bic',
                    'bank_details_sepa_iban'):
                if not cleaned_data.get('payment_banktransfer_%s' % f):
                    raise ValidationError(
                        {'payment_banktransfer_%s' % f: _('Please fill out your bank account details.')})
        else:
            if not cleaned_data.get('payment_banktransfer_bank_details'):
                raise ValidationError(
                    {'payment_banktransfer_bank_details': _('Please enter your bank account details.')})
        return cleaned_data

    def payment_form_render(self, request) -> str:
        template = get_template('pretixplugins/banktransfer/checkout_payment_form.html')
        ctx = {
            'request': request,
            'event': self.event,
            'settings': self.settings,
            'details': self.settings.get('bank_details', as_type=LazyI18nString),
        }
        return template.render(ctx)

    def checkout_prepare(self, request, total):
        return True

    def payment_prepare(self, request: HttpRequest, payment: OrderPayment):
        return True

    def payment_is_valid_session(self, request):
        return True

    def checkout_confirm_render(self, request):
        return self.payment_form_render(request)

    def order_pending_mail_render(self, order, payment) -> str:
        template = get_template('pretixplugins/banktransfer/email/order_pending.txt')
        bankdetails = []
        if self.settings.get('bank_details_type') == 'sepa':
            bankdetails += [
                _("Account holder"), ": ", self.settings.get('bank_details_sepa_name'), "\n",
                _("IBAN"), ": ", self.settings.get('bank_details_sepa_iban'), "\n",
                _("BIC"), ": ", self.settings.get('bank_details_sepa_bic'), "\n",
                _("Bank"), ": ", self.settings.get('bank_details_sepa_bank'),
            ]
        if bankdetails and self.settings.get('bank_details', as_type=LazyI18nString):
            bankdetails.append("\n")
        bankdetails.append(self.settings.get('bank_details', as_type=LazyI18nString))
        ctx = {
            'event': self.event,
            'order': order,
            'code': self._code(order),
            'amount': payment.amount,
            'details': textwrap.indent(''.join(str(i) for i in bankdetails), '    '),
        }
        return template.render(ctx)

    def payment_pending_render(self, request: HttpRequest, payment: OrderPayment):
        template = get_template('pretixplugins/banktransfer/pending.html')
        ctx = {
            'event': self.event,
            'code': self._code(payment.order),
            'order': payment.order,
            'amount': payment.amount,
            'settings': self.settings,
            'details': self.settings.get('bank_details', as_type=LazyI18nString),
        }
        return template.render(ctx)

    def payment_control_render(self, request: HttpRequest, payment: OrderPayment) -> str:
        template = get_template('pretixplugins/banktransfer/control.html')
        ctx = {'request': request, 'event': self.event,
               'code': self._code(payment.order),
               'payment_info': payment.info_data, 'order': payment.order}
        return template.render(ctx)

    def _code(self, order):
        if self.settings.get('omit_hyphen', as_type=bool):
            return self.event.slug.upper() + order.code
        else:
            return order.full_code

    def shred_payment_info(self, obj):
        if not obj.info_data:
            return
        d = obj.info_data
        d['reference'] = '█'
        d['payer'] = '█'
        d['_shredded'] = True
        obj.info = json.dumps(d)
        obj.save(update_fields=['info'])
