from django.shortcuts import render
from django.contrib.auth.mixins import *
from django.views.generic import *
from .models import *
from .forms import *

MAX_POSTS = 150
MARGIN = 20

# Create your views here.
def news(request):
    allow_empty = True
    queryset = None
    model = Blog
    paginate_by = None
    paginate_orphans = 0
    context_object_name = 'posts'
    # paginator_class = Paginator
    # page_kwarg = "page"
    ordering = ['-date_posted']

    if queryset is not None:
        queryset = queryset
        if isinstance(queryset, QuerySet):
            queryset = queryset.all()
    elif model is not None:
        queryset = model._default_manager.all()
    else:
        raise ImproperlyConfigured(
            "%(cls)s is missing a QuerySet. Define "
            "%(cls)s.model, %(cls)s.queryset, or override "
            "%(cls)s.get_queryset()." % {"cls": self.__class__.__name__}
        )

    if ordering:
        if isinstance(ordering, str):
            ordering = (ordering,)
        queryset = queryset.order_by(*ordering)

    return render(request, 'blog/home.html', { context_object_name: queryset, 'topics': ['No Updates...'] })


class BlogDetailView(DetailView):
    model = Blog
    template_name = 'blog/blogDetail.html'


class BlogCreateView(LoginRequiredMixin, CreateView):
    model = Blog
    template_name = 'blog/blogCreate.html'
    fields = ['title', 'content']

    def form_valid(self, form):
        form.instance.author = self.request.user
        return super().form_valid(form) and self.request.user.is_staff



class PostDetailView(DetailView):
    model = Post
    template_name = 'blog/postDetail.html'


class PostCreateView(LoginRequiredMixin, CreateView):
    model = Post
    template_name = 'blog/postCreate.html'
    fields = ['content']

    def form_valid(self, form):
        form.instance.author = self.request.user
        return super().form_valid(form)


def chat(request):
    if request.method == "POST":
        form = PostForm(request.POST)

        if form.is_valid():
            post = form.save(commit=False)
            post.author = request.user
            post.save()
            print(Post.objects.count())
            if Post.objects.count() > MAX_POSTS + MARGIN:
                qs = Post.objects.order_by("-date_posted")
                old_ids = qs.values_list("id", flat=True)[MAX_POSTS:]

                if old_ids:
                    Post.objects.filter(id__in=old_ids).delete()

            return render(request, "blog/partials/post.html", {"post": post})

    posts = Post.objects.select_related("author").order_by("-date_posted")
    form = PostForm()

    return render(request, "blog/postList.html", {
        "posts": posts,
        "form": form
    })

def posts_partial(request):
    posts = Post.objects.select_related("author").order_by("-date_posted")[:40]

    return render(request, "blog/partials/postList.html", {
        "posts": posts
    })

def dev(request):
    return render(request, 'dev.html', {'title': 'Development'})

def support(request):
    return render(request, 'support.html', {'title': 'Support Us'})

def home(request):
    return render(request, 'index.html', {'title': 'Home'})