from django import forms
from django.conf import settings
from django.contrib.admin.widgets import AdminDateWidget
from django.forms import ModelForm
from django.forms.renderers import DjangoTemplates
from django.utils.html import format_html
from django.utils.safestring import mark_safe
from django.utils.translation import gettext_lazy as trans

from .models import (
    Project,
    ProjectCategory,
    WikimediaProject,
    IFG,
    Library,
    ELiterature,
    Software,
    Travel,
    Email,
    Literature,
    List,
    BusinessCard,
)


class TableFormRenderer(DjangoTemplates):
    """
    Set in settings as the default form renderer.
    """

    form_template_name = 'django/forms/table.html'


class RadioField(forms.ChoiceField):
    widget = forms.RadioSelect


class BaseApplicationForm(ModelForm):
    """
    Base form for all external applications.
    """

    required_css_class = 'required'

    check = forms.BooleanField(
        required=True,
        label=format_html(
            """Ich stimme den <a href="{}" target="_blank" rel="noopener">Datenschutzbestimmungen</a> und der<br>
            <a href="{}" target="_blank" rel="noopener">Richtlinie zur Förderung der Communitys</a> zu.""",
            settings.DATAPROTECTION,
            settings.FOERDERRICHTLINIEN
        ),
    )


PROJECT_COST_GT_1000_MESSAGE = format_html(
    """Bitte beachte, dass für Projektkosten über 1.000 € ein öffentlicher Projektplan erforderlich
       ist (siehe <a href="{0}" target="blank_">Wikipedia:Förderung/Projektplanung)</a>.""",
    'https://de.wikipedia.org/wiki/Wikipedia:F%C3%B6rderung/Projektplanung'
)


class BaseProjectForm(ModelForm):
    categories = {
        'categories': ProjectCategory,
        'wikimedia_projects': WikimediaProject,
    }

    class Media:
        js = ('dropdown/js/otrs_link.js', 'js/project-categories.js')

    def clean(self):
        cleaned_data = ModelForm.clean(self)

        if self.errors:
            return cleaned_data

        for field, model in self.categories.items():
            field_other = f'{field}_other'
            values = cleaned_data[field]

            if model.other in values:
                if not cleaned_data[field_other]:
                    self.add_error(field_other, f'Bitte gib einen Wert an oder deselektiere "{model.OTHER}".')
            else:
                cleaned_data[field_other] = ''

        return cleaned_data


class ProjectForm(BaseProjectForm, BaseApplicationForm):
    OPTIONAL_FIELDS = {
        'categories_other',
        'wikimedia_projects_other',
        'page',
        'group',
        'location',
        'insurance',
        'notes',
    }

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        for field in set(self.fields) - self.OPTIONAL_FIELDS:
            self.fields[field].required = True

    class Meta:
        model = Project
        fields = [
            'realname',
            'email',
            'name',
            'description',
            'categories',
            'categories_other',
            'wikimedia_projects',
            'wikimedia_projects_other',
            'start',
            'end',
            'participants_estimated',
            'page',
            'group',
            'location',
            'cost',
            'insurance',
            'notes',
        ]
        labels = {
            'cost': 'Kosten in Euro',
            'insurance': 'Haftpflicht- und Unfallversicherung gewünscht',
            'participants_estimated': 'Voraussichtliche Zahl der Teilnehmenden',
        }
        widgets = {
            'start': AdminDateWidget,
            'end': AdminDateWidget,
        }

    class Media:
        css = {
            'all': ('css/dateFieldNoNowShortcutInTravels.css',)
        }

    def clean_cost(self):
        cost = self.cleaned_data['cost']

        if cost > 1000:
            raise forms.ValidationError(PROJECT_COST_GT_1000_MESSAGE, code='cost-gt-1000')

        return cost


HOTEL_CHOICES = {
    'TRUE': mark_safe('Hotelzimmer benötigt'),
    'FALSE': mark_safe('Kein Hotelzimmer benötigt'),
}


class TravelForm(BaseApplicationForm):
    # TODO: add some javascript to show/hide other-field

    hotel = RadioField(label='Hotelzimmer benötigt', choices=HOTEL_CHOICES)

    # this is the code, to change required to false if needed
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['project_name'].required = True
        self.fields['transport'].required = True
        self.fields['travelcost'].required = True
        self.fields['travelcost'].initial = None
        self.fields['checkin'].required = True
        self.fields['checkout'].required = True
        self.fields['hotel'].required = True

    class Meta:
        model = Travel
        fields = [
            'realname',
            'email',
            'project_name',
            'transport',
            'travelcost',
            'checkin',
            'checkout',
            'hotel',
            'notes',
        ]
        labels = {
            'checkin': 'Datum der Anreise',
            'checkout': 'Datum der Abreise',
        }
        widgets = {
            'checkin': AdminDateWidget,
            'checkout': AdminDateWidget,
        }

    class Media:
        js = ('dropdown/js/otrs_link.js',)
        css = {
            'all': ('css/dateFieldNoNowShortcutInTravels.css',)
        }


class LibraryForm(BaseApplicationForm):

    class Meta:
        model = Library
        fields = [
            'realname',
            'email',
            'cost',
            'library',
            'duration',
            'notes',
        ]
        labels = {
            'cost': 'Kosten in Euro',
        }

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.fields['library'].label = self._meta.model.LIBRARY_LABEL
        self.fields['library'].help_text = self._meta.model.LIBRARY_HELP_TEXT
        self.fields['duration'].help_text = self._meta.model.DURATION_HELP_TEXT


class ELiteratureForm(LibraryForm):

    class Meta(LibraryForm.Meta):
        model = ELiterature


class SoftwareForm(LibraryForm):

    class Meta(LibraryForm.Meta):
        model = Software


class IFGForm(BaseApplicationForm):

    class Meta:
        model = IFG
        fields = [
            'realname',
            'email',
            'cost',
            'url',
            'notes',
        ]


class TermsForm(BaseApplicationForm):
    terms_accepted_label = 'Ich stimme den <a href="{}">Nutzungsbedingungen</a> zu.'
    terms_accepted_url = settings.NUTZUNGSBEDINGUNGEN

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.fields['terms_accepted'].required = True
        self.fields['terms_accepted'].label = format_html(self.terms_accepted_label, self.terms_accepted_url)


class LiteratureForm(TermsForm):
    terms_accepted_url = settings.NUTZUNGSBEDINGUNGEN_LITERATURSTIPENDIUM

    class Meta:
        model = Literature
        fields = [
            'realname',
            'email',
            'cost',
            'info',
            'source',
            'notes',
            'selfbuy',
            'selfbuy_data',
            'selfbuy_give_data',
            'terms_accepted',
        ]

    class Media:
        js = ('dropdown/js/literature.js',)

    def clean(self):
        cleaned_data = TermsForm.clean(self)

        if self.errors:
            return cleaned_data

        if cleaned_data['selfbuy'] == 'TRUE':
            cleaned_data['selfbuy_data'] = ''
            cleaned_data['selfbuy_give_data'] = False

            return cleaned_data

        for field in 'selfbuy_data', 'selfbuy_give_data':
            if not cleaned_data.get('selfbuy_data'):
                self.add_error(field, trans('This field is required.'))

        return cleaned_data


ADULT_CHOICES = {
    'TRUE': mark_safe('Ich bin volljährig.'),
    'FALSE': mark_safe('Ich bin noch nicht volljährig.'),
}


class EmailForm(TermsForm):
    terms_accepted_url = settings.NUTZUNGSBEDINGUNGEN_EMAIL_SERVICE

    # this is the code, to change required to false if needed
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['adult'].required = True
        self.fields['other'].required = True

    adult = RadioField(label='Volljährigkeit', choices=ADULT_CHOICES)

    # TODO: add some javascript to show/hide other-field
    class Meta:
        model = Email
        fields = [
            'realname',
            'email',
            'domain',
            'address',
            'other',
            'adult',
            'terms_accepted',
        ]

    class Media:
        js = ('dropdown/js/mail.js',)


class BusinessCardForm(TermsForm):
    terms_accepted_url = settings.NUTZUNGSBEDINGUNGEN_VISITENKARTEN

    # this is the code, to change required to false if needed
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['url_of_pic'].required = True
        self.fields['send_data_to_print'].required = True

    class Meta:
        model = BusinessCard
        fields = [
            'realname',
            'email',
            'project',
            'data',
            'variant',
            'url_of_pic',
            'send_data_to_print',
            'sent_to',
            'terms_accepted',
        ]

    class Media:
        js = ('dropdown/js/businessCard.js',)


class ListForm(TermsForm):
    terms_accepted_url = settings.NUTZUNGSBEDINGUNGEN_MAILINGLISTEN

    class Meta:
        model = List
        fields = [
            'realname',
            'email',
            'domain',
            'address',
            'terms_accepted',
        ]

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.fields['address'].initial = ''