import logging
import re

import bs4
import requests
from django.contrib import messages
from django.http import HttpResponseRedirect, JsonResponse
from django.shortcuts import redirect
from django.urls import reverse
from django.views.decorators.cache import cache_page
from django.views.generic import CreateView, UpdateView, DeleteView, TemplateView

from manuels.forms import AddBookForm, AddSuppliesForm, EditBookForm, EditSuppliesForm
from manuels.models import Teacher, Book, SuppliesRequirement, CommonSupply, ISBNError
from manuels.utils import validate_isbn

logger = logging.getLogger(__name__)


class HomePageView(CreateView):
    model = Teacher
    fields = ['first_name', 'last_name', 'phone_number', 'email']
    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 = Teacher.objects.filter(pk=self.kwargs[self.teacher_field]).first()
        if not self.teacher:
            messages.warning(request, "Impossible de trouver le coordonnateur demandé. Si vous pensez que ceci est "
                                      "une erreur, merci de vous adresser à votre documentaliste.")
            return redirect('clear_teacher')
        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, TemplateView):
    template_name = 'manuels/list_books_supplies.html'


class ItemView(BaseTeacherView):
    add_another = False
    item_text = None
    item_text_plural = None
    success_target = None
    message_template = None
    verb = None
    button_class = 'primary'
    button_icon = 'fas fa-check-circle'

    def dispatch(self, request, *args, **kwargs):
        response = super().dispatch(request, *args, **kwargs)
        if self.teacher and self.teacher.has_confirmed_list:
            messages.error(request, "Vous avez déjà confirmé vos listes. Il n'est plus possible de les modifier.")
            return redirect('list_books', pk=self.teacher.pk)
        return response

    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
        context['button_icon'] = self.button_icon
        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'
    button_icon = 'fas fa-plus-circle'

    def get_success_url(self):
        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 HttpResponseRedirect(self.get_success_url())


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


class AddBookView(BookView, AddItemView):
    form_class = AddBookForm
    template_name = 'manuels/add_book.html'

    def form_valid(self, form: AddBookForm):
        for level in form.cleaned_data['levels']:
            book = Book.objects.create(
                teacher=form.cleaned_data['teacher'],
                level=level,
                field=form.cleaned_data['field'],
                title=form.cleaned_data['title'],
                authors=form.cleaned_data['authors'],
                editor=form.cleaned_data['editor'],
                other_editor=form.cleaned_data['other_editor'],
                publication_year=form.cleaned_data['publication_year'],
                isbn=form.cleaned_data['isbn'],
                price=form.cleaned_data['price'],
                previously_acquired=form.cleaned_data['previously_acquired'],
                comments=form.cleaned_data['comments'],
                consumable=form.cleaned_data['consumable'],
            )
            messages.success(self.request, f'"{book}" a été ajouté.')

        return super().form_valid(form)


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'
    template_name = 'manuels/add_supplies.html'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['common_supplies'] = CommonSupply.objects.all()
        return context

    def form_valid(self, form: AddBookForm):
        for level in form.cleaned_data['levels']:
            supplies = SuppliesRequirement.objects.create(
                teacher=form.cleaned_data['teacher'],
                level=level,
                field=form.cleaned_data['field'],
                supplies=form.cleaned_data['supplies'],
            )
            messages.success(self.request, f'"{supplies}" a été ajouté.')

        return super().form_valid(form)


class EditItemView(ItemView, UpdateView):
    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
    template_name = 'manuels/add_book.html'


class EditSuppliesView(SuppliesView, EditItemView):
    form_class = EditSuppliesForm
    template_name = 'manuels/add_supplies.html'


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'
    button_icon = 'fas fa-trash'
    template_name = 'manuels/add_supplies.html'

    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 'teacher_pk' in request.session:
        del request.session['teacher_pk']
    return redirect('home_page')


class ConfirmTeacherView(BaseTeacherView, UpdateView):
    model = Teacher
    fields = []
    template_name = 'manuels/confirm_teacher.html'

    def form_valid(self, form):
        response = super().form_valid(form)
        self.object.has_confirmed_list = True
        self.object.save()
        self.object.send_confirmation(request=self.request)
        messages.success(self.request, "Vos listes ont été validées. Votre documentaliste a été notifiée par email.")
        return response


# We are able to cache the response because it's very unlikely that the details of a book will change through time
@cache_page(2 * 60 * 60)
def isbn_api(request, isbn):
    try:
        return JsonResponse(Book.fetch_from_decitre(isbn))
    except ISBNError as e:
        return JsonResponse(e.data)