from smtplib import SMTPException

from django.views.generic.edit import CreateView
from django.urls import reverse
from django.http import HttpResponse, HttpResponseRedirect
from django.core.mail import send_mail, BadHeaderError
from django.template.loader import get_template
from formtools.wizard.views import CookieWizardView
from django.shortcuts import render

from .models import Employee
from .forms import PersonalForm, WorkingForm, ITForm, OfficeForm, DummyForm
from .settings import MAILS, EVA_MAIL

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


class EvaFormView(CookieWizardView):
    template_name = 'evapp/employee_form.html'
    form_list = [PersonalForm, WorkingForm, ITForm, OfficeForm, DummyForm]
    instance = None
    data = {}

    # we need this to display all the data in the last step
    def get_context_data(self, form, **kwargs):
        context = super().get_context_data(form=form, **kwargs)
        context.update({'data': self.get_all_cleaned_data()})
        return context

    #this makes shure, that we use the same model instance for all steps
    def get_form_instance(self,step):
        if self.instance == None:
            self.instance = Employee()
        return self.instance

    def done(self, form_list, **kwargs):
        # form = form_list[0] #.save()
        print ('INSTANCE_DICT')
        print(self.instance_dict)
        # save data to database
        for form in form_list:
            form.save()
        # send data to departments
        for dep in MAILS:
            self.send_mail_to_department(dep)
        return HttpResponseRedirect('success')

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

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

        # TODO: don't send ALL the data
        context = {'data': self.data}

        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:
            self.insatnce.delete()
            return HttpResponse('Invalid header found. Data not saved!')
        except SMTPException:
            self.instance.delete()
            return HttpResponse('Error in sending mails (propably wrong adress?). Data not saved!')