"""
Enhancements to wagtail.contrib.forms.
"""
import csv
import os
from django import forms
from django.contrib.contenttypes.models import ContentType
from django.core.exceptions import ValidationError
from django.db import models
from django.http import HttpResponse
from django.utils.translation import gettext_lazy as _
from wagtail.contrib.forms.views import SubmissionsListView as WagtailSubmissionsListView
from wagtail.contrib.forms.forms import FormBuilder
from wagtail.contrib.forms.models import AbstractFormField

from wagtailcrx.settings import crx_settings
from wagtailcrx.utils import attempt_protected_media_value_conversion

FORM_FIELD_CHOICES = (
    (_("Text"), (
        ("singleline", _("Single line text")),
        ("multiline", _("Multi-line text")),
        ("email", _("Email")),
        ("number", _("Number - only allows integers")),
        ("url", _("URL")),
    ),),
    (_("Choice"), (
        ("checkboxes", _("Checkboxes")),
        ("dropdown", _("Drop down")),
        ("radio", _("Radio buttons")),
        ("multiselect", _("Multiple select")),
        ("checkbox", _("Single checkbox")),
    ),),
    (_("Date & Time"), (
        ("date", _("Date")),
        ("time", _("Time")),
        ("datetime", _("Date and time")),
    ),),
    (_("File Upload"), (
        ("file", _("Secure File - login required to access uploaded files")),
    ),),
    (_("Other"), (
        ("hidden", _("Hidden field")),
    ),),
)


# Files

class SecureFileField(forms.FileField):
    custom_error_messages = {
        'blacklist_file': _('Submitted file is not allowed.'),
        'whitelist_file': _('Submitted file is not allowed.')
    }

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.error_messages.update(self.custom_error_messages)

    def validate(self, value):
        super(SecureFileField, self).validate(value)
        if value:
            self._check_whitelist(value)
            self._check_blacklist(value)

    def _check_whitelist(self, value):
        if crx_settings.CRX_PROTECTED_MEDIA_UPLOAD_WHITELIST:
            if os.path.splitext(value.name)[1].lower() not in crx_settings.CRX_PROTECTED_MEDIA_UPLOAD_WHITELIST:  # noqa
                raise ValidationError(self.error_messages['whitelist_file'])

    def _check_blacklist(self, value):
        if crx_settings.CRX_PROTECTED_MEDIA_UPLOAD_BLACKLIST:
            if os.path.splitext(value.name)[1].lower() in crx_settings.CRX_PROTECTED_MEDIA_UPLOAD_BLACKLIST:  # noqa
                raise ValidationError(self.error_messages['blacklist_file'])


# Date

class CoderedDateInput(forms.DateInput):
    template_name = 'wagtailcrx/formfields/date.html'


class CoderedDateField(forms.DateField):
    widget = CoderedDateInput()


# Datetime

class CoderedDateTimeInput(forms.DateTimeInput):
    template_name = 'wagtailcrx/formfields/datetime.html'


class CoderedDateTimeField(forms.DateTimeField):
    widget = CoderedDateTimeInput()
    input_formats = ['%Y-%m-%dT%H:%M', '%m/%d/%Y %I:%M %p', '%m/%d/%Y %I:%M%p', '%m/%d/%Y %H:%M']


# Time

class CoderedTimeInput(forms.TimeInput):
    template_name = 'wagtailcrx/formfields/time.html'


class CoderedTimeField(forms.TimeField):
    widget = CoderedTimeInput()
    input_formats = ['%H:%M', '%I:%M %p', '%I:%M%p']


class CoderedFormBuilder(FormBuilder):
    """
    Enhance wagtail FormBuilder with additional custom fields.
    """

    def create_file_field(self, field, options):
        return SecureFileField(**options)

    def create_date_field(self, field, options):
        return CoderedDateField(**options)

    def create_datetime_field(self, field, options):
        return CoderedDateTimeField(**options)

    def create_time_field(self, field, options):
        return CoderedTimeField(**options)


class CoderedSubmissionsListView(WagtailSubmissionsListView):
    def get_csv_response(self, context):
        filename = self.get_csv_filename()
        response = HttpResponse(content_type='text/csv; charset=utf-8')
        response['Content-Disposition'] = 'attachment;filename={}'.format(filename)

        writer = csv.writer(response)
        writer.writerow(context['data_headings'])
        for data_row in context['data_rows']:
            modified_data_row = []
            for cell in data_row:
                modified_cell = attempt_protected_media_value_conversion(self.request, cell)
                modified_data_row.append(modified_cell)

            writer.writerow(modified_data_row)
        return response


class CoderedFormField(AbstractFormField):
    class Meta:
        abstract = True

    field_type = models.CharField(
        verbose_name=_('field type'),
        max_length=16,
        choices=FORM_FIELD_CHOICES,
        blank=False,
        default='Single line text'
    )


class SearchForm(forms.Form):
    s = forms.CharField(
        max_length=255,
        required=False,
        label=_('Search'),
    )
    t = forms.CharField(
        widget=forms.HiddenInput,
        max_length=255,
        required=False,
        label=_('Page type'),
    )


def get_page_model_choices():
    """
    Returns a list of tuples of all creatable Codered pages
    in the format of (app_label:model, "Verbose Name")
    """
    from wagtailcrx.models import get_page_models

    rval = []
    for page in get_page_models():
        if page.is_creatable:
            ct = ContentType.objects.get_for_model(page)
            rval.append((f"{ct.app_label}:{ct.model}", ct.name))
    return rval