from smtplib import SMTPException

from django.views.generic.edit import CreateView
from django.urls import reverse
from django.http import HttpResponse
from django.core.mail import send_mail, BadHeaderError
from django.template.loader import get_template

from .models import Employee
from .forms import EmployeeForm
from .settings import MAILS, EVA_MAIL

def success(request):
    return HttpResponse("gut gemacht!")

def send_mail_to_department(department, form):
    'send a mail to the given department with the nececcary notifications'

    print(f'send mail to department {department}...')

    model = form.save()
    context = {'data': {}}

    # add all relevant fields of the form to the template context
    data = MAILS[department]['DATA']
    for key in data:
        context['data'][key] = form.cleaned_data[key]

    try:
         mail_template = get_template(f'evapp/{department}_mail.txt')
         send_mail(
             'EVA: Neuzugang',
             mail_template.render(context),
             EVA_MAIL,
             [MAILS[department]['MAIL']],
             fail_silently=False)
    except BadHeaderError:
        # modell.delete()
        return HttpResponse('Invalid header found. Data not saved!')
    except SMTPException:
        # modell.delete()
        return HttpResponse('Error in sending mails (propably wrong adress?). Data not saved!')


class EvaFormView(CreateView):
    model = Employee
    form_class = EmployeeForm

    def get_success_url(self):
        return reverse('success')

    def form_valid(self, form):
        for dep in MAILS:
            send_mail_to_department(dep, form)

        return super().form_valid(form)