from datetime import date

from django.shortcuts import render
from django.forms import modelformset_factory
from django.http import HttpResponse
from formtools.wizard.views import CookieWizardView
from django.core.mail import send_mail, BadHeaderError
from django.conf import settings
from django.template.loader import get_template
from django.template import Context

from .forms import ProjectForm, ExternForm, LibraryForm, IFGForm,\
                   HonoraryCertificateForm, InternForm, TravelForm, EmailForm
from .models import Project, TYPE_CHOICES, Library
from .settings import URLPREFIX, IF_EMAIL


def authorize(request, choice, pk):
    '''If IF grant a support they click a link in a mail which leads here.
    We write the granted field in the database here and set a timestamp.'''
    # TODO: write a timestamp which is needed to determine time of next mail

    if choice in ('BIB', 'ELIT', 'SOFT'):
        Library.set_granted(pk,True)
        return HttpResponse(f"AUTHORIZED! choice: {choice}, pk: {pk}")
    else:
        return HttpResponse(f'ERROR! UNKNWON CHOICE TYPE! {choice}')


def deny(request, choice, pk):
    '''If IF denies a support they click a link in a mail which leads here
    We write the granted field in the database here.'''

    if choice in ('BIB', 'ELIT', 'SOFT'):
        Library.set_granted(pk,False)
        return HttpResponse(f"DENIED! choice: {choice}, pk: {pk}")
    else:
        return HttpResponse(f'ERROR! UNKNWON CHOICE TYPE {choice}!')


def done(request):
    return HttpResponse("Your data is save now.")

class InternView(CookieWizardView):
    '''This View is for WMDE-employees only'''

    template_name = 'input/extern.html'
    form_list = [InternForm, ProjectForm]

    def get_form(self, step=None, data=None, files=None):
        '''this function determines which part of the multipart form is
        displayed next'''

        if step is None:
            step = self.steps.current
        print ("get_form() step " + step)

        if step == '1':
            prev_data = self.get_cleaned_data_for_step('0')
            choice = prev_data.get('choice')
            print(f'choice detection: {TYPE_CHOICES[choice]}')
            if choice == 'HON':
                form = HonoraryCertificateForm(data)
            elif choice == 'PRO':
                form = ProjectForm(data)
            elif choice == 'TRAV':
                form = TravelForm(data)
            else:
                raise RuntimeError(f'ERROR! UNKNOWN FORMTYPE {choice} in InternView')
        else:
            form = super().get_form(step, data, files)
        return form

    def done(self, form_list, **kwargs):
        print('InternView.done() reached')
        # gather data from all forms
        data = {}
        for form in form_list:
            data = {**data, **form.cleaned_data}
        print(data)

        # write data to database
        form = form.save(commit=False)
        # we have to copy the data from the first form here
        # this is ugly code. how can we copy this without explicit writing?
        # i found no way to access the ModelForm.Meta.exclude-tupel
        form.realname = data['realname']
        # form.username = data['username']
        form.email = data['email']
        form.granted = True
        form.granted_date = date.today()
        form.save()

        return done(self.request)


class ExternView(CookieWizardView):
    '''This View is for Volunteers'''

    template_name = "input/extern.html"
    form_list = [ExternForm, LibraryForm]

    def get_form(self, step=None, data=None, files=None):
        '''this function determines which part of the multipart form is
        displayed next'''

        if step is None:
            step = self.steps.current
        print ("get_form() step " + step)

        if step == '1':
            prev_data = self.get_cleaned_data_for_step('0')
            choice = prev_data.get('choice')
            print(f'choice detection in ExternView: {TYPE_CHOICES[choice]}')
            if choice == 'IFG':
                form = IFGForm(data)
            elif choice in ('BIB', 'SOFT', 'ELIT'):
                form = LibraryForm(data)
                form.fields['library'].label = TYPE_CHOICES[choice]
            elif choice == 'MAIL':
                form = EmailForm(data)
            else:
                raise RuntimeError(f'ERROR! UNKNOWN FORMTYPE {choice} in ExternView')
        else:
            form = super().get_form(step, data, files)
        return form

    def done(self, form_list, **kwargs):
        print('ExternView.done() reached')
        # gather data from all forms
        data = {}
        for form in form_list:
            data = {**data, **form.cleaned_data}
        print(data)

        # write data to database
        form = form.save(commit=False)
        # we have to copy the data from the first form here
        # this is a bit ugly code. how can we copy this without explicit writing?
        form.realname = data['realname']
        # form.username = data['username']
        form.email = data['email']
        # write type of form in some cases
        if data['choice'] in ('BIB', 'ELIT', 'SOFT'):
            form.type = data['choice']
        form.save()

        # add some data to context for mail templates
        data['pk'] = form.pk
        data['urlprefix'] = URLPREFIX

        # we need to send the following mails here:
        context = { 'data': data }
        try:
            #  - mail with entered data to the Volunteer
            mail_template = get_template('input/ifg_volunteer_mail.txt')
            send_mail(
                'Formular ausgefüllt',
                mail_template.render(context),
                IF_EMAIL,
                [form.email],
                fail_silently=False)
            #  - mail to IF with link to accept/decline
            mail_template = get_template('input/if_mail.txt')
            send_mail(
                'Formular ausgefüllt',
                mail_template.render(context),
                IF_EMAIL,
                [IF_EMAIL],
                fail_silently=False)

        except BadHeaderError:
            return HttpResponse('Invalid header found.')

        return done(self.request)