from django.contrib import messages
from django.contrib.auth.mixins import PermissionRequiredMixin
from django.shortcuts import get_object_or_404, redirect
from django.urls import reverse
from django.views.generic import CreateView, ListView, UpdateView, DeleteView

from manuels.forms import AddBookForm, AddSuppliesForm, EditBookForm, EditSuppliesForm
from manuels.models import Teacher, Book, SuppliesRequirement

import logging

logger = logging.getLogger(__name__)


class HomePageView(CreateView):
    model = Teacher
    fields = '__all__'
    template_name = 'manuels/home_page.html'

    def get(self, request, *args, **kwargs):
        teacher_pk = request.session.get('teacher_pk')
        if teacher_pk:
            return redirect('list_books', pk=teacher_pk)

        return super().get(request, *args, **kwargs)

    def form_valid(self, form):
        response = super().form_valid(form)
        self.object.send_link(self.request)
        return response


class BaseTeacherView:
    teacher = None
    teacher_field = 'pk'

    def dispatch(self, request, *args, **kwargs):
        self.teacher = get_object_or_404(Teacher, pk=self.kwargs[self.teacher_field])
        request.session['teacher_pk'] = str(self.teacher.pk)
        return super().dispatch(request, *args, **kwargs)

    def get_context_data(self, **kwargs):
        context = super().get_context_data()
        context['teacher'] = self.teacher

        return context


class ListBooksView(BaseTeacherView, ListView):
    model = Book
    template_name = 'manuels/list_books_supplies.html'
    context_object_name = 'books'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['supplies'] = SuppliesRequirement.objects.filter(teacher=self.teacher)
        return context

    def get_queryset(self):
        return Book.objects.filter(teacher=self.teacher)


class ItemView(BaseTeacherView):
    add_another = False
    item_text = None
    item_text_plural = None
    success_target = None
    message_template = None
    template_name = 'manuels/add_item.html'
    verb = None
    button_class = 'primary'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['item'] = self.item_text
        context['item_plural'] = self.item_text_plural
        context['message_template'] = self.message_template
        context['verb'] = self.verb
        context['button_class'] = self.button_class
        return context

    def get_initial(self):
        return {
            'teacher': self.teacher
        }

    def get_form(self, form_class=None):
        form = super().get_form(form_class)
        form.fields['teacher'].queryset = Teacher.objects.filter(pk=self.teacher.pk)
        return form


class AddItemView(ItemView, CreateView):
    verb = 'Ajouter'

    def get_success_url(self):
        messages.success(self.request, f'"{self.object}" a été ajouté.')
        if self.add_another:
            return reverse(self.success_target, args=[str(self.teacher.pk)])
        else:
            return reverse('list_books', args=[str(self.teacher.pk)])

    def form_valid(self, form):
        self.add_another = form.cleaned_data['add_another']
        return super().form_valid(form)


class BookView:
    model = Book
    success_target = 'add_book'
    item_text = 'un livre'
    item_text_plural = 'livres'


class AddBookView(BookView, AddItemView):
    form_class = AddBookForm


class SuppliesView:
    model = SuppliesRequirement
    success_target = 'add_supplies'
    item_text = 'des fournitures'
    item_text_plural = 'fournitures'


class AddSuppliesView(SuppliesView, AddItemView):
    form_class = AddSuppliesForm
    message_template = 'manuels/supplies_message.html'


class EditItemView(ItemView, UpdateView):
    template_name = 'manuels/add_item.html'
    teacher_field = 'teacher_pk'
    item_text = None
    item_text_plural = None
    message_template = None
    verb = 'Modifier'

    def get_queryset(self):
        return self.model.objects.filter(teacher=self.teacher)

    def get_success_url(self):
        messages.success(self.request, f'"{self.object}" a été modifié.')
        return reverse('list_books', args=[str(self.teacher.pk)])


class EditBookView(BookView, EditItemView):
    form_class = EditBookForm


class EditSuppliesView(SuppliesView, EditItemView):
    form_class = EditSuppliesForm


class DeleteItemView(ItemView, DeleteView):
    teacher_field = 'teacher_pk'
    item_text = None
    item_text_plural = None
    message_template = 'manuels/confirm_delete.html'
    verb = 'Supprimer'
    button_class = 'danger'

    def get_queryset(self):
        return self.model.objects.filter(teacher=self.teacher)

    def get_success_url(self):
        messages.success(self.request, f'"{self.object}" a été supprimé.')
        return reverse('list_books', args=[str(self.teacher.pk)])


class DeleteBookView(BookView, DeleteItemView):
    pass


class DeleteSuppliesView(SuppliesView, DeleteItemView):
    pass


def clear_teacher_view(request):
    if request.session['teacher_pk']:
        del request.session['teacher_pk']
    return redirect('home_page')