from decimal import Decimal, ROUND_DOWN
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
import requests
from .models import Park, ParkArea
from .forms import ParkForm
from .location_utils import normalize_coordinate, normalize_osm_result
from core.views import SlugRedirectMixin
from moderation.mixins import EditSubmissionMixin, PhotoSubmissionMixin, HistoryMixin
from moderation.models import EditSubmission
from media.models import Photo


def location_search(request):
    """Search for locations using OpenStreetMap Nominatim API"""
    query = request.GET.get("q", "")
    if not query:
        return JsonResponse({"results": []})

    # Call Nominatim API
    response = requests.get(
        "https://nominatim.openstreetmap.org/search",
        params={
            "q": query,
            "format": "json",
            "addressdetails": 1,
            "namedetails": 1,  # Include name tags
            "accept-language": "en",  # Prefer English results
            "limit": 10,
        },
        headers={"User-Agent": "ThrillWiki/1.0"},
    )

    if response.status_code == 200:
        results = response.json()
        # Normalize each result
        normalized_results = [normalize_osm_result(result) for result in results]
        # Filter out any results with invalid coordinates
        valid_results = [r for r in normalized_results if r['lat'] is not None and r['lon'] is not None]
        return JsonResponse({"results": valid_results})

    return JsonResponse({"results": []})


def reverse_geocode(request):
    """Reverse geocode coordinates using OpenStreetMap Nominatim API"""
    try:
        lat = Decimal(request.GET.get("lat", ""))
        lon = Decimal(request.GET.get("lon", ""))
    except (TypeError, ValueError, InvalidOperation):
        return JsonResponse({"error": "Invalid coordinates"}, status=400)

    if not lat or not lon:
        return JsonResponse({"error": "Missing coordinates"}, status=400)

    # Normalize coordinates before geocoding
    lat = lat.quantize(Decimal('0.000001'), rounding=ROUND_DOWN)
    lon = lon.quantize(Decimal('0.000001'), rounding=ROUND_DOWN)

    # Validate ranges
    if lat < -90 or lat > 90:
        return JsonResponse({"error": "Latitude must be between -90 and 90"}, status=400)
    if lon < -180 or lon > 180:
        return JsonResponse({"error": "Longitude must be between -180 and 180"}, status=400)

    # Call Nominatim API
    response = requests.get(
        "https://nominatim.openstreetmap.org/reverse",
        params={
            "lat": str(lat),
            "lon": str(lon),
            "format": "json",
            "addressdetails": 1,
            "namedetails": 1,  # Include name tags
            "accept-language": "en",  # Prefer English results
        },
        headers={"User-Agent": "ThrillWiki/1.0"},
    )

    if response.status_code == 200:
        result = response.json()
        # Normalize the result
        normalized_result = normalize_osm_result(result)
        if normalized_result['lat'] is None or normalized_result['lon'] is None:
            return JsonResponse({"error": "Invalid coordinates"}, status=400)
        return JsonResponse(normalized_result)

    return JsonResponse({"error": "Geocoding failed"}, status=500)


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").prefetch_related("photos")

        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(city__icontains=search)
                | Q(state__icontains=search)
                | Q(country__icontains=search)
            )

        if country:
            queryset = queryset.filter(country__icontains=country)

        if region:
            queryset = queryset.filter(state__icontains=region)

        if city:
            queryset = queryset.filter(city__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)


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_queryset(self):
        return super().get_queryset().prefetch_related(
            'rides',
            'rides__manufacturer',
            'photos',
            'areas'
        )

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["areas"] = self.object.areas.all()
        # Get rides ordered by status (operating first) and name
        context["rides"] = self.object.rides.all().order_by(
            '-status',  # OPERATING will come before others
            'name'
        )
        return context

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


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
        # 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()
        # Convert Decimal fields to strings
        decimal_fields = ["latitude", "longitude", "size_acres", "average_rating"]
        for field in decimal_fields:
            if data.get(field):
                data[field] = str(data[field])
        return data

    def form_valid(self, form):
        # Normalize coordinates before saving
        if form.cleaned_data.get("latitude"):
            lat = Decimal(str(form.cleaned_data["latitude"]))
            form.cleaned_data["latitude"] = lat.quantize(Decimal('0.000001'), rounding=ROUND_DOWN)
        if form.cleaned_data.get("longitude"):
            lon = Decimal(str(form.cleaned_data["longitude"]))
            form.cleaned_data["longitude"] = lon.quantize(Decimal('0.000001'), rounding=ROUND_DOWN)

        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"]:
            try:
                self.object = form.save()
                submission.object_id = self.object.id
                submission.status = "APPROVED"
                submission.handled_by = self.request.user
                submission.save()

                # Handle photo uploads
                photos = self.request.FILES.getlist("photos")
                for photo_file in photos:
                    try:
                        Photo.objects.create(
                            image=photo_file,
                            uploaded_by=self.request.user,
                            content_type=ContentType.objects.get_for_model(Park),
                            object_id=self.object.id,
                        )
                    except Exception as e:
                        messages.error(
                            self.request,
                            f"Error uploading photo {photo_file.name}: {str(e)}",
                        )

                messages.success(
                    self.request,
                    f"Successfully created {self.object.name}. "
                    f"Added {len(photos)} photo(s).",
                )
                return HttpResponseRedirect(self.get_success_url())
            except Exception as e:
                messages.error(
                    self.request,
                    f"Error creating park: {str(e)}. Please check your input and try again.",
                )
                return self.form_invalid(form)

        messages.success(
            self.request,
            "Your park submission has been sent for review. "
            "You will be notified when it is approved.",
        )
        return HttpResponseRedirect(reverse("parks:park_list"))

    def form_invalid(self, form):
        messages.error(
            self.request,
            "Please correct the errors below. Required fields are marked with an asterisk (*).",
        )
        for field, errors in form.errors.items():
            for error in errors:
                messages.error(self.request, f"{field}: {error}")
        return super().form_invalid(form)

    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
        # 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()
        # Convert Decimal fields to strings
        decimal_fields = ["latitude", "longitude", "size_acres", "average_rating"]
        for field in decimal_fields:
            if data.get(field):
                data[field] = str(data[field])
        return data

    def form_valid(self, form):
        # Normalize coordinates before saving
        if form.cleaned_data.get("latitude"):
            lat = Decimal(str(form.cleaned_data["latitude"]))
            form.cleaned_data["latitude"] = lat.quantize(Decimal('0.000001'), rounding=ROUND_DOWN)
        if form.cleaned_data.get("longitude"):
            lon = Decimal(str(form.cleaned_data["longitude"]))
            form.cleaned_data["longitude"] = lon.quantize(Decimal('0.000001'), rounding=ROUND_DOWN)

        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"]:
            try:
                self.object = form.save()
                submission.status = "APPROVED"
                submission.handled_by = self.request.user
                submission.save()

                # Handle photo uploads
                photos = self.request.FILES.getlist("photos")
                uploaded_count = 0
                for photo_file in photos:
                    try:
                        Photo.objects.create(
                            image=photo_file,
                            uploaded_by=self.request.user,
                            content_type=ContentType.objects.get_for_model(Park),
                            object_id=self.object.id,
                        )
                        uploaded_count += 1
                    except Exception as e:
                        messages.error(
                            self.request,
                            f"Error uploading photo {photo_file.name}: {str(e)}",
                        )

                messages.success(
                    self.request,
                    f"Successfully updated {self.object.name}. "
                    f"Added {uploaded_count} new photo(s).",
                )
                return HttpResponseRedirect(self.get_success_url())
            except Exception as e:
                messages.error(
                    self.request,
                    f"Error updating park: {str(e)}. Please check your input and try again.",
                )
                return self.form_invalid(form)

        messages.success(
            self.request,
            f"Your changes to {self.object.name} have been sent for review. "
            "You will be notified when they are approved.",
        )
        return HttpResponseRedirect(
            reverse("parks:park_detail", kwargs={"slug": self.object.slug})
        )

    def form_invalid(self, form):
        messages.error(
            self.request,
            "Please correct the errors below. Required fields are marked with an asterisk (*).",
        )
        for field, errors in form.errors.items():
            for error in errors:
                messages.error(self.request, f"{field}: {error}")
        return super().form_invalid(form)

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


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)
        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}