from django.views.generic import DetailView, ListView, CreateView, UpdateView
from django.shortcuts import get_object_or_404, render
from django.core.serializers.json import DjangoJSONEncoder
from django.urls import reverse
from django.db.models import Q
from django.contrib.auth.mixins import LoginRequiredMixin
from django.contrib.contenttypes.models import ContentType
from django.contrib import messages
from django.http import JsonResponse, HttpResponseRedirect, HttpResponse
from .models import Park, ParkArea
from .forms import ParkForm
from rides.models import Ride
from core.views import SlugRedirectMixin
from moderation.mixins import EditSubmissionMixin, PhotoSubmissionMixin, HistoryMixin
from moderation.models import EditSubmission
from cities_light.models import Country, Region, City

def get_countries(request):
    query = request.GET.get('q', '')
    filter_parks = request.GET.get('filter_parks', 'false') == 'true'
    
    # Base query
    countries = Country.objects.filter(name__icontains=query)
    
    # Only filter by parks if explicitly requested
    if filter_parks:
        countries = countries.filter(park__isnull=False)
    
    countries = countries.distinct().values('id', 'name')[:10]
    return JsonResponse(list(countries), safe=False)

def get_regions(request):
    query = request.GET.get('q', '')
    country = request.GET.get('country', '')
    filter_parks = request.GET.get('filter_parks', 'false') == 'true'
    
    if not country:
        return JsonResponse([], safe=False)
    
    # Base query
    regions = Region.objects.filter(
        Q(name__icontains=query) | Q(alternate_names__icontains=query),
        country__name__iexact=country
    )
    
    # Only filter by parks if explicitly requested
    if filter_parks:
        regions = regions.filter(park__isnull=False)
    
    regions = regions.distinct().values('id', 'name')[:10]
    return JsonResponse(list(regions), safe=False)

def get_cities(request):
    query = request.GET.get('q', '')
    region = request.GET.get('region', '')
    country = request.GET.get('country', '')
    filter_parks = request.GET.get('filter_parks', 'false') == 'true'
    
    if not region or not country:
        return JsonResponse([], safe=False)
    
    # Base query
    cities = City.objects.filter(
        Q(name__icontains=query) | Q(alternate_names__icontains=query),
        region__name__iexact=region,
        region__country__name__iexact=country
    )
    
    # Only filter by parks if explicitly requested
    if filter_parks:
        cities = cities.filter(park__isnull=False)
    
    cities = cities.distinct().values('id', 'name')[:10]
    return JsonResponse(list(cities), safe=False)

class ParkCreateView(LoginRequiredMixin, CreateView):
    model = Park
    form_class = ParkForm
    template_name = 'parks/park_form.html'

    def prepare_changes_data(self, cleaned_data):
        data = cleaned_data.copy()
        # Convert model instances to IDs for JSON serialization
        if data.get('owner'):
            data['owner'] = data['owner'].id
        if data.get('country'):
            data['country'] = data['country'].id
        if data.get('region'):
            data['region'] = data['region'].id
        if data.get('city'):
            data['city'] = data['city'].id
        # Convert dates to ISO format strings
        if data.get('opening_date'):
            data['opening_date'] = data['opening_date'].isoformat()
        if data.get('closing_date'):
            data['closing_date'] = data['closing_date'].isoformat()
        return data

    def form_valid(self, form):
        changes = self.prepare_changes_data(form.cleaned_data)

        # Create submission record
        submission = EditSubmission.objects.create(
            user=self.request.user,
            content_type=ContentType.objects.get_for_model(Park),
            submission_type='CREATE',
            changes=changes,
            reason=self.request.POST.get('reason', ''),
            source=self.request.POST.get('source', '')
        )

        # If user is moderator or above, auto-approve
        if self.request.user.role in ['MODERATOR', 'ADMIN', 'SUPERUSER']:
            self.object = form.save()
            submission.object_id = self.object.id
            submission.status = 'APPROVED'
            submission.handled_by = self.request.user
            submission.save()
            messages.success(self.request, f'Successfully created {self.object.name}')
            return HttpResponseRedirect(self.get_success_url())
        
        messages.success(self.request, 'Your park submission has been sent for review')
        return HttpResponseRedirect(reverse('parks:park_list'))

    def get_success_url(self):
        return reverse('parks:park_detail', kwargs={'slug': self.object.slug})

class ParkUpdateView(LoginRequiredMixin, UpdateView):
    model = Park
    form_class = ParkForm
    template_name = 'parks/park_form.html'

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

    def prepare_changes_data(self, cleaned_data):
        data = cleaned_data.copy()
        # Convert model instances to IDs for JSON serialization
        if data.get('owner'):
            data['owner'] = data['owner'].id
        if data.get('country'):
            data['country'] = data['country'].id
        if data.get('region'):
            data['region'] = data['region'].id
        if data.get('city'):
            data['city'] = data['city'].id
        # Convert dates to ISO format strings
        if data.get('opening_date'):
            data['opening_date'] = data['opening_date'].isoformat()
        if data.get('closing_date'):
            data['closing_date'] = data['closing_date'].isoformat()
        return data

    def form_valid(self, form):
        changes = self.prepare_changes_data(form.cleaned_data)

        # Create submission record
        submission = EditSubmission.objects.create(
            user=self.request.user,
            content_type=ContentType.objects.get_for_model(Park),
            object_id=self.object.id,
            submission_type='EDIT',
            changes=changes,
            reason=self.request.POST.get('reason', ''),
            source=self.request.POST.get('source', '')
        )

        # If user is moderator or above, auto-approve
        if self.request.user.role in ['MODERATOR', 'ADMIN', 'SUPERUSER']:
            self.object = form.save()
            submission.status = 'APPROVED'
            submission.handled_by = self.request.user
            submission.save()
            messages.success(self.request, f'Successfully updated {self.object.name}')
            return HttpResponseRedirect(self.get_success_url())
        
        messages.success(self.request, f'Your changes to {self.object.name} have been sent for review')
        return HttpResponseRedirect(reverse('parks:park_detail', kwargs={'slug': self.object.slug}))

    def get_success_url(self):
        return reverse('parks:park_detail', kwargs={'slug': self.object.slug})

class ParkDetailView(SlugRedirectMixin, EditSubmissionMixin, PhotoSubmissionMixin, HistoryMixin, DetailView):
    model = Park
    template_name = 'parks/park_detail.html'
    context_object_name = 'park'

    def get_object(self, queryset=None):
        if queryset is None:
            queryset = self.get_queryset()
        slug = self.kwargs.get(self.slug_url_kwarg)
        # Try to get by current or historical slug
        return self.model.get_by_slug(slug)[0]

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['rides'] = Ride.objects.filter(
            park=self.object
        ).select_related('coaster_stats')
        context['areas'] = ParkArea.objects.filter(park=self.object)
        return context

    def get_redirect_url_pattern(self):
        return 'parks:park_detail'

class ParkAreaDetailView(SlugRedirectMixin, EditSubmissionMixin, PhotoSubmissionMixin, HistoryMixin, DetailView):
    model = ParkArea
    template_name = 'parks/area_detail.html'
    context_object_name = 'area'
    slug_url_kwarg = 'area_slug'

    def get_object(self, queryset=None):
        if queryset is None:
            queryset = self.get_queryset()
        park_slug = self.kwargs.get('park_slug')
        area_slug = self.kwargs.get('area_slug')
        # Try to get by current or historical slug
        obj, is_old_slug = self.model.get_by_slug(area_slug)
        if obj.park.slug != park_slug:
            raise self.model.DoesNotExist("Park slug doesn't match")
        return obj

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['rides'] = Ride.objects.filter(
            area=self.object
        ).select_related('coaster_stats')
        return context

    def get_redirect_url_pattern(self):
        return 'parks:park_detail'

    def get_redirect_url_kwargs(self):
        return {
            'park_slug': self.object.park.slug,
            'area_slug': self.object.slug
        }

class ParkListView(ListView):
    model = Park
    template_name = 'parks/park_list.html'
    context_object_name = 'parks'

    def get_queryset(self):
        queryset = Park.objects.select_related('owner', 'country', 'region', 'city').prefetch_related('photos', 'rides')
        
        search = self.request.GET.get('search', '').strip()
        country = self.request.GET.get('country', '').strip()
        region = self.request.GET.get('region', '').strip()
        city = self.request.GET.get('city', '').strip()
        statuses = self.request.GET.getlist('status')
        
        if search:
            queryset = queryset.filter(
                Q(name__icontains=search) | 
                Q(location__icontains=search)
            )
        
        if country:
            queryset = queryset.filter(country__name__icontains=country)
        
        if region:
            queryset = queryset.filter(region__name__icontains=region)
        
        if city:
            queryset = queryset.filter(city__name__icontains=city)
        
        if statuses:
            queryset = queryset.filter(status__in=statuses)
            
        return queryset

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['current_filters'] = {
            'search': self.request.GET.get('search', ''),
            'country': self.request.GET.get('country', ''),
            'region': self.request.GET.get('region', ''),
            'city': self.request.GET.get('city', ''),
            'statuses': self.request.GET.getlist('status')
        }
        return context

    def get(self, request, *args, **kwargs):
        # Check if this is an HTMX request
        if request.htmx:
            # If it is, return just the parks list partial
            self.template_name = 'parks/partials/park_list.html'
        return super().get(request, *args, **kwargs)