from django.shortcuts import render, get_object_or_404, redirect
from django.utils import timezone
from django.views.generic import (TemplateView, ListView, DetailView, CreateView, UpdateView, DeleteView)
from blog.models import Post,Comment
from blog.forms import PostForm, CommentForm
from django.urls import reverse_lazy # success url shouldn't be activated before delete view
from django.contrib.auth.decorators import login_required
from django.contrib.auth.mixins import LoginRequiredMixin


# Create your views here.

# Class based views for Posts

class AboutView(TemplateView):
    template_name= 'about.html'


class PostListView(ListView):
    model= Post


    def get_queryset(self): # SQL query in python style.  __lte means: less than or equal to -published_date will order in desc order
        return Post.objects.filter(published_date__lte=timezone.now()).order_by('-published_date')


class PostDetailView(DetailView):
    model= Post

class PostCreateView(LoginRequiredMixin,CreateView):
    login_url= '/login/' # what the login url would be (yahan se login hogaa)
    redirect_field_name= 'blog/post_detail.html' # redirected after login (login ke baad yahan se redirect)

    form_class= PostForm
    model= Post


class PostUpdateView(LoginRequiredMixin,UpdateView):
    login_url= '/login/' # what the login url would be (yahan se login hogaa)
    redirect_field_name= 'blog/post_detail.html' # redirected after login (login ke baad yahan se redirect)

    form_class= PostForm
    model= Post


class PostDeleteView(LoginRequiredMixin,DeleteView):
    model= Post
    success_url= reverse_lazy('post_list')



class DraftListView(LoginRequiredMixin,ListView):
    login_url= '/login/' # what the login url would be (yahan se login hogaa)
    redirect_field_name= 'blog/post_list.html' # redirected after login (login ke baad yahan se redirect ho post_list pe)
    model= Post

    def get_queryset(self):
         return Post.objects.filter(published_date__isnull=True).order_by('created_date')


##################### Post related views above


# Function based views for Comments



@login_required
def post_publish(request, pk):
    post = get_object_or_404(Post, pk=pk)
    post.publish()
    return redirect('post_detail', pk=pk)

@login_required
def add_comment_to_post(request, pk):
    post = get_object_or_404(Post, pk=pk)
    if request.method == "POST":
        form = CommentForm(request.POST)
        if form.is_valid():
            comment = form.save(commit=False)
            comment.post = post
            comment.save()
            return redirect('post_detail', pk=post.pk)
    else:
        form = CommentForm()
    return render(request, 'blog/comment_form.html', {'form': form})


@login_required
def comment_approve(request, pk):
    comment = get_object_or_404(Comment, pk=pk)
    comment.approve()
    return redirect('post_detail', pk=comment.post.pk)


@login_required
def comment_remove(request, pk):
    comment = get_object_or_404(Comment, pk=pk)
    post_pk = comment.post.pk # Before deletion we saved it in a variable
    comment.delete()
    return redirect('post_detail', pk=post_pk)
