from django.views.generic import CreateView, ListView, UpdateView, DeleteView
from django.views.generic.detail import DetailView
from django.views.generic.edit import FormView, ModelFormMixin
from django.http import JsonResponse
from django.core import serializers
from django.forms import modelformset_factory
from django.db.models import Count
from django.views.generic.base import RedirectView
from django.utils.decorators import method_decorator
from django.contrib.auth.decorators import login_required
from django.contrib import messages
from django.shortcuts import get_object_or_404, render, redirect
from django.urls import reverse, reverse_lazy

from rest_framework import viewsets
from rest_framework.response import Response
from rest_framework.decorators import list_route
from rest_framework import permissions

from .serializers import NoteSerializer, NotebookSerializer, NoteTagSerializer
from .models import Note, Notebook, LuxTag
from .forms import NoteForm, NotebookForm
from utils.views import AjaxableResponseMixin

##################
# Base Views
##################


@method_decorator(login_required, name='dispatch')
class BaseListView(ListView):
    pass


@method_decorator(login_required, name='dispatch')
class BaseDetailView(DetailView):
    pass


@method_decorator(login_required, name='dispatch')
class LoggedInViewWithUser(FormView):

    def get_form_kwargs(self, **kwargs):
        kwargs = super().get_form_kwargs(**kwargs)
        kwargs.update({'user': self.request.user})
        return kwargs


##################
# Note Views
##################


class NoteListView(BaseListView):
    model = Note

    def get_queryset(self):
        if not self.request.user.is_anonymous:
            return Note.objects.prefetch_related('tags').filter(owner=self.request.user).select_related('notebook')

    def get_context_data(self, **kwargs):
        context = super(NoteListView, self).get_context_data(**kwargs)
        context['notebook_list'] = Notebook.objects.filter(owner=self.request.user).annotate(note_count=Count('note'))
        context['tag_list'] = LuxTag.objects.filter(note__owner=self.request.user).annotate(note_count=Count('note'))
        return context

    def get_template_names(self):
        # print("IP Address for debug-toolbar: " + self.request.META['REMOTE_ADDR'])
        if not self.request.user.is_anonymous:
            return ['notes/notes_list.html']
        else:
            return ['sell.html']


class NoteDetailView(LoggedInViewWithUser, AjaxableResponseMixin, UpdateView):
    '''
    POST only works as AJAX
    '''
    model = Note
    form_class = NoteForm
    template_name = 'notes/notes_detail.html'

    def get_queryset(self):
        if not self.request.user.is_anonymous:
            return Note.objects.filter(owner=self.request.user)

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['notebook_form'] = NotebookForm
        return context

    def form_valid(self, form):
        if "trash" in self.request.POST:
            form.instance.notebook = Notebook.include_trash.get(owner=self.request.user, name="Trash")
            self.object = form.save()
            messages.info(self.request, 'The note %s was moved to the trash. <a href="/nb/trash">View trash</a>' % (self.object.title), extra_tags='safe')
            return redirect('notes:list')
        else:
            self.object = form.save()
            tags = serializers.serialize("json", self.object.tags.all())
            data = {
                'tags': tags,
                'notebook': {'name': self.object.notebook.name, 'color': self.object.notebook.color_rgb}
            }
            return JsonResponse(data, safe=True)


class NoteCreateView(LoggedInViewWithUser, CreateView):
    model = Note
    form_class = NoteForm
    template_name = 'notes/notes_create.html'

    def form_valid(self, form):
        form.instance.owner = self.request.user
        self.object = form.save()
        return super(NoteCreateView, self).form_valid(form)

    def get_success_url(self):
        return reverse_lazy('notes:detail', kwargs={'slug': self.object.slug, 'pk': self.object.pk})

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['notebook_form'] = NotebookForm
        # context['notes_list'] = Note.objects.filter(owner=self.request.user).select_related()
        return context


class NoteTagView(BaseListView):
    model = Note
    template_name = 'notes/notes_list.html'

    def get_queryset(self):
        '''
        This can generate a crazy amount of joins if there's a lot of tags
        have to keep an eye on it. Would be better to do:
        from django.db.models import Q
        from functools import reduce
        from operator import and_, or_
        #query = reduce(and_, (Q(tags__slug=t) for t in self.tag_list))
        # Note.objects.filter(query, owner=self.request.user)
        But that doesn't work for some reason.
        '''
        if not self.request.user.is_anonymous:
            try:
                tags = self.kwargs['slug'].split("+")
            except ValueError:
                tags = self.kwargs['slug']
            self.tag_list = [x.strip() for x in tags]
            qs = Note.objects.prefetch_related('tags').filter(owner=self.request.user).select_related('notebook')
            for tag in self.tag_list:
                qs = qs.filter(tags__slug=tag)
            return qs

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        #context['notes_list'] = Note.objects.filter(owner=self.request.user)
        context['tags'] = LuxTag.objects.filter(slug__in=self.tag_list)
        return context


##################
# Notebook Views
##################


class NotebookListView(LoggedInViewWithUser, CreateView):
    model = Notebook
    form_class = NotebookForm
    template_name = 'notes/notebook_list.html'

    def get_queryset(self):
        if not self.request.user.is_anonymous:
            return Notebook.objects.filter(owner=self.request.user)

    def form_valid(self, form):
        form.instance.owner = self.request.user
        self.object = form.save()
        return super(NotebookListView, self).form_valid(form)

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        NotebookFormSet = modelformset_factory(Notebook, form=NotebookForm, extra=0)
        context['notebook_form_list'] = NotebookFormSet(queryset=Notebook.objects.filter(owner=self.request.user).select_related().annotate(note_count=Count('note')))
        #context['notebook_list'] = Notebook.objects.filter(owner=self.request.user).exclude(name="Trash").select_related().annotate(note_count=Count('note'))
        #context['notes_list'] = Note.objects.filter(owner=self.request.user).select_related()
        return context

    def get_success_url(self):
        return reverse_lazy('notebooks:detail', kwargs={'slug': self.object.slug})


class NotebookDetailView(BaseDetailView):
    model = Notebook

    def get_queryset(self):
        if not self.request.user.is_anonymous:
            if self.kwargs["slug"] == 'trash':
                return Notebook.include_trash.filter(owner=self.request.user)
            else:
                return Notebook.objects.filter(owner=self.request.user)

    def get_object(self):
        notebook = get_object_or_404(self.get_queryset().select_related(), owner=self.request.user, slug=self.kwargs["slug"])
        self.form = NotebookForm(instance=notebook)
        return notebook

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        #context['notes_list'] = Note.objects.filter(owner=self.request.user).select_related()
        context['form'] = self.form
        return context


##################
# API Views
##################


class IsOwnerOrDeny(permissions.BasePermission):
    """
    Custom permission to only allow owners to post to their endpoint
    """

    def has_object_permission(self, request, view, obj):
        # Write permissions are only allowed to the owner of the snippet.
        return obj.owner == request.user


class NoteViewSet(viewsets.ModelViewSet):
    """
    API endpoint that allows notes to be viewed or edited.
    """
    serializer_class = NoteSerializer
    permission_classes = (permissions.IsAuthenticated,)

    def get_queryset(self):
        return Note.objects.filter(owner=self.request.user).order_by('-date_created')

    def perform_create(self, serializer):
        serializer.save(owner=self.request.user, tags__owner=self.request.user)

    def get_object(self):
        obj = get_object_or_404(self.get_queryset(), pk=self.kwargs["pk"])
        if obj.is_public:
            return obj
        else:
            self.check_object_permissions(self.request, obj)
            return obj


class NotebookViewSet(viewsets.ModelViewSet):
    """
    API endpoint that allows botebook to be viewed or edited.
    """
    serializer_class = NotebookSerializer

    def get_queryset(self):
        return Notebook.objects.filter(owner=self.request.user).order_by('-date_created')

    def perform_create(self, serializer):
        serializer.save(owner=self.request.user)

    def get_menu_data(self, serializer):
        return Notebook.objects.filter(owner=self.request.user).order_by('-name')[:1]


class TagViewSet(viewsets.ModelViewSet):
    """
    API endpoint that allows notes to be viewed or edited.
    """
    serializer_class = NoteTagSerializer
    permission_classes = (permissions.IsAuthenticated,)

    def get_queryset(self):
        return LuxTag.objects.filter(owner=self.request.user)

    def perform_create(self, serializer):
        serializer.save(owner=self.request.user)