"""
This module contains the form class for the contact_form app.

"""
from __future__ import absolute_import, unicode_literals

from django import forms
from django.conf import settings
from django.core.mail import send_mail
from django.template import RequestContext
from django.template import loader
from django.urls import reverse
from django.utils.translation import ugettext_lazy as _

from django.contrib.sites.models import Site
from django.contrib.sites.requests import RequestSite

from crispy_forms.helper import FormHelper
from crispy_forms.layout import Submit


class ContactForm(forms.Form):
    """
    This is the contact form class.

    """
    name = forms.CharField(max_length=100, label=_('Your name'))
    email = forms.EmailField(max_length=200, label=_('Your email address'))
    body = forms.CharField(widget=forms.Textarea, label=_('Your message'))

    subject_template_name = "contact_form/contact_form_subject.txt"
    template_name = 'contact_form/contact_form.txt'
    from_email = settings.DEFAULT_FROM_EMAIL
    recipient_list = [mail_tuple[1] for mail_tuple in settings.MANAGERS]

    def __init__(self, **kwargs):
        self.request = kwargs.pop('request')
        super(ContactForm, self).__init__(**kwargs)
        self.helper = FormHelper()
        self.helper.form_action = reverse('contact_form')
        self.helper.add_input(Submit('submit', _('Send message')))

    def get_context(self):
        if not self.is_valid():
            raise ValueError(
                'Cannot generate context from invalid contact form')
        if Site._meta.installed:
            site = Site.objects.get_current()
        else:
            site = RequestSite(self.request)
        return RequestContext(
            self.request, dict(self.cleaned_data, site=site))

    def message(self):
        context = self.get_context()
        template_context = context.flatten()
        template_context.update({
            'remote_ip': context.request.META['REMOTE_ADDR']
        })
        return loader.render_to_string(self.template_name, template_context)

    def subject(self):
        context = self.get_context().flatten()
        subject = loader.render_to_string(self.subject_template_name, context)
        return ''.join(subject.splitlines())

    def save(self, fail_silently=False):
        """
        Build and send the email.

        """
        send_mail(
            fail_silently=fail_silently,
            from_email=self.from_email,
            recipient_list=self.recipient_list,
            subject=self.subject(),
            message=self.message()
        )