from django.shortcuts import render
from django.urls import reverse_lazy, reverse
from django.views.generic.base import TemplateView
from django.views.generic.edit import FormView, CreateView, UpdateView, DeleteView
from django.views.generic.detail import DetailView
from django.views.generic.list import ListView

from charts.models import Chart, Meal
from charts.forms import MealForm


from django.db.models import (Exists, OuterRef,
    Prefetch, Subquery, Count, Sum, F, Q, Value)
from django.db.models.functions import Length, Upper

# Entries
class ListView(ListView):
    model = Meal
    pk_url_kwarg = 'entry_pk'

class CreateView(CreateView):
    model = Meal
    pk_url_kwarg = 'entry_pk'
    template_name = 'charts/entry_create_form.html'
    form_class = MealForm

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['chart'] = Chart.objects.get(pk=self.kwargs['pk'])
        return context

    def form_valid(self, form):
        form.instance.chart = Chart.objects.get(pk=self.kwargs['pk'])
        return super().form_valid(form)

    def get_success_url(self):
        return reverse('chart-detail', kwargs={'pk': self.kwargs['pk']})

class DetailView(DetailView):
    model = Meal
    pk_url_kwarg = 'entry_pk'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['chart'] = Chart.objects.get(pk=self.kwargs['pk'])
        return context

class UpdateView(UpdateView):
    model = Meal
    pk_url_kwarg = 'entry_pk'
    template_name = 'charts/entry_form.html'
    form_class = MealForm

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['chart'] = Chart.objects.get(pk=self.kwargs['pk'])
        return context

class DeleteView(DeleteView):
    model = Meal
    pk_url_kwarg = 'entry_pk'
    
    def get_success_url(self):
        return reverse('chart-detail', kwargs={'pk': self.kwargs['pk']})