import json
import requests
from django.views.generic import View
from django.http import JsonResponse
from django.contrib.auth.mixins import LoginRequiredMixin
from django.core.cache import cache
from django.conf import settings
from django.views.decorators.http import require_http_methods
from django.utils.decorators import method_decorator
from django.views.decorators.csrf import csrf_protect
from django.db.models import Q
from .models import Location

class LocationSearchView(View):
    """
    View for searching locations using OpenStreetMap Nominatim.
    Returns search results in JSON format.
    """
    
    @method_decorator(csrf_protect)
    def get(self, request, *args, **kwargs):
        query = request.GET.get('q', '').strip()
        filter_type = request.GET.get('type', '')  # country, state, city
        filter_parks = request.GET.get('filter_parks', 'false') == 'true'

        if not query:
            return JsonResponse({'results': []})

        # Check cache first
        cache_key = f'location_search_{query}_{filter_type}_{filter_parks}'
        cached_results = cache.get(cache_key)
        if cached_results:
            return JsonResponse({'results': cached_results})

        # Search OpenStreetMap
        try:
            params = {
                'q': query,
                'format': 'json',
                'addressdetails': 1,
                'limit': 10
            }

            # Add type-specific filters
            if filter_type == 'country':
                params['featuretype'] = 'country'
            elif filter_type == 'state':
                params['featuretype'] = 'state'
            elif filter_type == 'city':
                params['featuretype'] = 'city'

            response = requests.get(
                'https://nominatim.openstreetmap.org/search',
                params=params,
                headers={'User-Agent': 'ThrillWiki/1.0'}
            )
            response.raise_for_status()
            results = response.json()
        except requests.RequestException as e:
            return JsonResponse({
                'error': 'Failed to fetch location data',
                'details': str(e)
            }, status=500)

        # Process and format results
        formatted_results = []
        for result in results:
            address = result.get('address', {})
            formatted_result = {
                'name': result.get('display_name', ''),
                'lat': result.get('lat'),
                'lon': result.get('lon'),
                'type': result.get('type', ''),
                'address': {
                    'street': address.get('road', ''),
                    'house_number': address.get('house_number', ''),
                    'city': address.get('city', '') or address.get('town', '') or address.get('village', ''),
                    'state': address.get('state', ''),
                    'country': address.get('country', ''),
                    'postcode': address.get('postcode', '')
                }
            }

            # If filtering by parks, only include results that have parks
            if filter_parks:
                location_exists = Location.objects.filter(
                    Q(country__icontains=formatted_result['address']['country']) &
                    (Q(state__icontains=formatted_result['address']['state']) if formatted_result['address']['state'] else Q()) &
                    (Q(city__icontains=formatted_result['address']['city']) if formatted_result['address']['city'] else Q())
                ).exists()
                if not location_exists:
                    continue

            formatted_results.append(formatted_result)

        # Cache results for 1 hour
        cache.set(cache_key, formatted_results, 3600)

        return JsonResponse({'results': formatted_results})

class LocationCreateView(LoginRequiredMixin, View):
    """View for creating new Location objects"""
    
    @method_decorator(csrf_protect)
    def post(self, request, *args, **kwargs):
        form = LocationForm(request.POST)
        if form.is_valid():
            location = form.save()
            return JsonResponse({
                'id': location.id,
                'name': location.name,
                'formatted_address': location.get_formatted_address(),
                'coordinates': location.coordinates
            })
        return JsonResponse({'errors': form.errors}, status=400)

class LocationUpdateView(LoginRequiredMixin, View):
    """View for updating existing Location objects"""
    
    @method_decorator(csrf_protect)
    def post(self, request, *args, **kwargs):
        location = Location.objects.get(pk=kwargs['pk'])
        form = LocationForm(request.POST, instance=location)
        if form.is_valid():
            location = form.save()
            return JsonResponse({
                'id': location.id,
                'name': location.name,
                'formatted_address': location.get_formatted_address(),
                'coordinates': location.coordinates
            })
        return JsonResponse({'errors': form.errors}, status=400)

class LocationDeleteView(LoginRequiredMixin, View):
    """View for deleting Location objects"""
    
    @method_decorator(csrf_protect)
    def post(self, request, *args, **kwargs):
        try:
            location = Location.objects.get(pk=kwargs['pk'])
            location.delete()
            return JsonResponse({'status': 'success'})
        except Location.DoesNotExist:
            return JsonResponse({'error': 'Location not found'}, status=404)

@require_http_methods(["GET"])
def reverse_geocode(request):
    """
    View for reverse geocoding coordinates to address using OpenStreetMap.
    Returns address details in JSON format.
    """
    lat = request.GET.get('lat')
    lon = request.GET.get('lon')
    
    if not lat or not lon:
        return JsonResponse({'error': 'Latitude and longitude are required'}, status=400)
    
    # Check cache first
    cache_key = f'reverse_geocode_{lat}_{lon}'
    cached_result = cache.get(cache_key)
    if cached_result:
        return JsonResponse(cached_result)
    
    try:
        response = requests.get(
            'https://nominatim.openstreetmap.org/reverse',
            params={
                'lat': lat,
                'lon': lon,
                'format': 'json',
                'addressdetails': 1
            },
            headers={'User-Agent': 'ThrillWiki/1.0'}
        )
        response.raise_for_status()
        result = response.json()
        
        address = result.get('address', {})
        formatted_result = {
            'name': result.get('display_name', ''),
            'address': {
                'street': address.get('road', ''),
                'house_number': address.get('house_number', ''),
                'city': address.get('city', '') or address.get('town', '') or address.get('village', ''),
                'state': address.get('state', ''),
                'country': address.get('country', ''),
                'postcode': address.get('postcode', '')
            }
        }
        
        # Cache result for 1 day
        cache.set(cache_key, formatted_result, 86400)
        
        return JsonResponse(formatted_result)
        
    except requests.RequestException as e:
        return JsonResponse({
            'error': 'Failed to fetch address data',
            'details': str(e)
        }, status=500)