# Copyright (C) 2018-2022 by BDE ENS Paris-Saclay
# SPDX-License-Identifier: GPL-3.0-or-later
from crispy_forms.helper import FormHelper
from django.contrib.auth.mixins import LoginRequiredMixin
from django.urls import reverse_lazy
from django.utils import timezone
from django.utils.translation import gettext_lazy as _
from django.views.generic import DetailView, UpdateView
from django_tables2 import SingleTableView

from permission.backends import PermissionBackend
from permission.views import ProtectQuerysetMixin, ProtectedCreateView

from .forms import FoodForm, MealForm, SheetForm, FoodOptionsFormSet, FoodOptionFormSetHelper
from .models import Sheet, Food, Meal
from .tables import SheetTable


class SheetListView(ProtectQuerysetMixin, LoginRequiredMixin, SingleTableView):
    model = Sheet
    table_class = SheetTable
    ordering = '-date'
    extra_context = {"title": _("Search note sheet")}

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["can_create_sheet"] = PermissionBackend.check_perm(self.request, "sheets.add_sheet", Sheet(
            name="Test",
            date=timezone.now(),
            description="Test sheet",
        ))
        return context


class SheetCreateView(ProtectQuerysetMixin, ProtectedCreateView):
    model = Sheet
    form_class = SheetForm
    extra_context = {"title": _("Create note sheet")}

    def get_sample_object(self):
        return Sheet(
            name="Test",
            date=timezone.now(),
            description="Test",
        )


class SheetUpdateView(ProtectQuerysetMixin, UpdateView):
    model = Sheet
    form_class = SheetForm
    extra_context = {"title": _("Update note sheet")}


class SheetDetailView(ProtectQuerysetMixin, DetailView):
    model = Sheet

    def get_context_data(self, **kwargs):
        context = super().get_context_data()

        context['can_change_sheet'] = PermissionBackend.check_perm(self.request, 'sheets.change_sheet', self.object)
        context['can_add_meal'] = PermissionBackend.check_perm(self.request,
                                                               'sheets.add_meal',
                                                               Meal(sheet=self.object, name="Test", price=500))
        context['can_add_food'] = PermissionBackend.check_perm(self.request,
                                                               'sheets.add_food',
                                                               Food(sheet=self.object, name="Test", price=500))

        return context


class FoodCreateView(ProtectQuerysetMixin, ProtectedCreateView):
    model = Food
    form_class = FoodForm
    extra_context = {"title": _("Create new food")}

    def get_sample_object(self):
        return Food(
            sheet_id=self.kwargs['pk'],
            name="Test",
            price=500,
        )

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        form = context['form']
        form.helper = FormHelper()
        # Remove form tag on the generation of the form in the template (already present on the template)
        form.helper.form_tag = False
        # The formset handles the set of the products
        form_set = FoodOptionsFormSet(instance=form.instance)
        context['formset'] = form_set
        context['helper'] = FoodOptionFormSetHelper()

        return context

    def form_valid(self, form):
        form.instance.sheet_id = self.kwargs['pk']

        # For each product, we save it
        formset = FoodOptionsFormSet(self.request.POST, instance=form.instance)
        if formset.is_valid():
            for f in formset:
                # We don't save the product if the designation is not entered, ie. if the line is empty
                if f.is_valid() and f.instance.name:
                    f.save()
                    f.instance.save()
                else:
                    f.instance = None

        return super().form_valid(form)

    def get_success_url(self):
        return reverse_lazy('sheets:sheet_detail', args=(self.kwargs['pk'],))


class FoodUpdateView(ProtectQuerysetMixin, UpdateView):
    model = Food
    form_class = FoodForm
    extra_context = {"title": _("Update food")}

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        form = context['form']
        form.helper = FormHelper()
        # Remove form tag on the generation of the form in the template (already present on the template)
        form.helper.form_tag = False
        # The formset handles the set of the products
        form_set = FoodOptionsFormSet(instance=form.instance)
        context['formset'] = form_set
        context['helper'] = FoodOptionFormSetHelper()

        return context

    def form_valid(self, form):
        # For each product, we save it
        formset = FoodOptionsFormSet(self.request.POST, instance=form.instance)
        if formset.is_valid():
            for f in formset:
                # We don't save the product if the designation is not entered, ie. if the line is empty
                if f.is_valid() and f.instance.name:
                    f.save()
                    f.instance.save()
                else:
                    f.instance = None

        return super().form_valid(form)

    def get_success_url(self):
        return reverse_lazy('sheets:sheet_detail', args=(self.object.sheet_id,))


class MealCreateView(ProtectQuerysetMixin, ProtectedCreateView):
    model = Meal
    form_class = MealForm
    extra_context = {"title": _("Create new meal")}

    def get_sample_object(self):
        return Meal(
            sheet_id=self.kwargs['pk'],
            name="Test",
            price=500,
        )

    def get_form(self, form_class=None):
        form = super().get_form(form_class)
        form.fields['content'].queryset = form.fields['content'].queryset.filter(sheet_id=self.kwargs['pk'])
        return form

    def form_valid(self, form):
        form.instance.sheet_id = self.kwargs['pk']
        return super().form_valid(form)

    def get_success_url(self):
        return reverse_lazy('sheets:sheet_detail', args=(self.object.sheet_id,))


class MealUpdateView(ProtectQuerysetMixin, UpdateView):
    model = Meal
    form_class = MealForm
    extra_context = {"title": _("Update meal")}

    def get_form(self, form_class=None):
        form = super().get_form(form_class)
        form.fields['content'].queryset = form.fields['content'].queryset.filter(sheet=self.object.sheet)
        return form

    def get_success_url(self):
        return reverse_lazy('sheets:sheet_detail', args=(self.object.sheet_id,))