from decimal import Decimal, ROUND_DOWN, InvalidOperation
from typing import Any, Optional, cast, Type
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, Avg, Count, QuerySet, Model
from django.core.exceptions import ObjectDoesNotExist
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, HttpRequest
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
from location.models import Location
from reviews.models import Review
from analytics.models import PageView


def park_actions(request: HttpRequest, slug: str) -> HttpResponse:
    """Return the park actions partial template"""
    park = get_object_or_404(Park, slug=slug)
    return render(request, "parks/partials/park_actions.html", {"park": park})


def get_park_areas(request: HttpRequest) -> HttpResponse:
    """Return park areas as options for a select element"""
    park_id = request.GET.get('park')
    if not park_id:
        return HttpResponse('<option value="">Select a park first</option>')
    
    try:
        park = Park.objects.get(id=park_id)
        areas = park.areas.all()
        options = ['<option value="">No specific area</option>']
        options.extend([
            f'<option value="{area.id}">{area.name}</option>'
            for area in areas
        ])
        return HttpResponse('\n'.join(options))
    except Park.DoesNotExist:
        return HttpResponse('<option value="">Invalid park selected</option>')


def search_parks(request: HttpRequest) -> HttpResponse:
    """Search parks and return results for HTMX"""
    query = request.GET.get('q', '').strip()
    
    # If no query, show first 10 parks
    if not query:
        parks = Park.objects.all().order_by('name')[:10]
    else:
        parks = Park.objects.filter(name__icontains=query).order_by('name')[:10]
    
    return render(request, "parks/partials/park_search_results.html", {"parks": parks})


def location_search(request: HttpRequest) -> JsonResponse:
    """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,
            "accept-language": "en",
            "limit": 10,
        },
        headers={"User-Agent": "ThrillWiki/1.0"},
    )

    if response.status_code == 200:
        results = response.json()
        normalized_results = [normalize_osm_result(result) for result in results]
        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: HttpRequest) -> JsonResponse:
    """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)

    lat = lat.quantize(Decimal("0.000001"), rounding=ROUND_DOWN)
    lon = lon.quantize(Decimal("0.000001"), rounding=ROUND_DOWN)

    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
        )

    response = requests.get(
        "https://nominatim.openstreetmap.org/reverse",
        params={
            "lat": str(lat),
            "lon": str(lon),
            "format": "json",
            "addressdetails": 1,
            "namedetails": 1,
            "accept-language": "en",
        },
        headers={"User-Agent": "ThrillWiki/1.0"},
    )

    if response.status_code == 200:
        result = response.json()
        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)


def add_park_button(request: HttpRequest) -> HttpResponse:
    """Return the add park button partial template"""
    return render(request, "parks/partials/add_park_button.html")


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

    def get_queryset(self) -> QuerySet[Park]:
        queryset = Park.objects.select_related("owner").prefetch_related(
            "photos", "location"
        )

        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__city__icontains=search)
                | Q(location__state__icontains=search)
                | Q(location__country__icontains=search)
            )

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

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

        if city:
            queryset = queryset.filter(location__city__icontains=city)

        if statuses:
            queryset = queryset.filter(status__in=statuses)

        queryset = queryset.annotate(
            total_rides=Count("rides"),
            total_coasters=Count("rides", filter=Q(rides__category="RC")),
        )

        return queryset.distinct()

    def get_context_data(self, **kwargs: Any) -> dict[str, Any]:
        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: HttpRequest, *args: Any, **kwargs: Any) -> HttpResponse:
        if hasattr(request, "htmx") and getattr(request, "htmx", False):
            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: Optional[QuerySet[Park]] = None) -> Park:
        if queryset is None:
            queryset = self.get_queryset()
        slug = self.kwargs.get(self.slug_url_kwarg)
        if slug is None:
            raise ObjectDoesNotExist("No slug provided")
        park, _ = Park.get_by_slug(slug)
        return park

    def get_queryset(self) -> QuerySet[Park]:
        return cast(
            QuerySet[Park],
            super()
            .get_queryset()
            .prefetch_related(
                "rides", "rides__manufacturer", "photos", "areas", "location"
            ),
        )

    def get_context_data(self, **kwargs: Any) -> dict[str, Any]:
        context = super().get_context_data(**kwargs)
        park = cast(Park, self.object)
        context["areas"] = park.areas.all()
        context["rides"] = park.rides.all().order_by("-status", "name")

        if self.request.user.is_authenticated:
            context["has_reviewed"] = Review.objects.filter(
                user=self.request.user,
                content_type=ContentType.objects.get_for_model(Park),
                object_id=park.id,
            ).exists()
        else:
            context["has_reviewed"] = False

        return context

    def get_redirect_url_pattern(self) -> str:
        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: dict[str, Any]) -> dict[str, Any]:
        data = cleaned_data.copy()
        if data.get("owner"):
            data["owner"] = data["owner"].id
        if data.get("opening_date"):
            data["opening_date"] = data["opening_date"].isoformat()
        if data.get("closing_date"):
            data["closing_date"] = data["closing_date"].isoformat()
        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 normalize_coordinates(self, form: ParkForm) -> None:
        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
            )

    def form_valid(self, form: ParkForm) -> HttpResponse:
        self.normalize_coordinates(form)
        changes = self.prepare_changes_data(form.cleaned_data)

        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 hasattr(self.request.user, "role") and getattr(
            self.request.user, "role", None
        ) 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()

                if form.cleaned_data.get("latitude") and form.cleaned_data.get(
                    "longitude"
                ):
                    Location.objects.create(
                        content_type=ContentType.objects.get_for_model(Park),
                        object_id=self.object.id,
                        name=self.object.name,
                        location_type="park",
                        latitude=form.cleaned_data["latitude"],
                        longitude=form.cleaned_data["longitude"],
                        street_address=form.cleaned_data.get("street_address", ""),
                        city=form.cleaned_data.get("city", ""),
                        state=form.cleaned_data.get("state", ""),
                        country=form.cleaned_data.get("country", ""),
                        postal_code=form.cleaned_data.get("postal_code", ""),
                    )

                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: ParkForm) -> HttpResponse:
        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) -> str:
        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: Any) -> dict[str, Any]:
        context = super().get_context_data(**kwargs)
        context["is_edit"] = True
        return context

    def prepare_changes_data(self, cleaned_data: dict[str, Any]) -> dict[str, Any]:
        data = cleaned_data.copy()
        if data.get("owner"):
            data["owner"] = data["owner"].id
        if data.get("opening_date"):
            data["opening_date"] = data["opening_date"].isoformat()
        if data.get("closing_date"):
            data["closing_date"] = data["closing_date"].isoformat()
        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 normalize_coordinates(self, form: ParkForm) -> None:
        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
            )

    def form_valid(self, form: ParkForm) -> HttpResponse:
        self.normalize_coordinates(form)
        changes = self.prepare_changes_data(form.cleaned_data)

        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 hasattr(self.request.user, "role") and getattr(
            self.request.user, "role", None
        ) in ["MODERATOR", "ADMIN", "SUPERUSER"]:
            try:
                self.object = form.save()
                submission.status = "APPROVED"
                submission.handled_by = self.request.user
                submission.save()

                location_data = {
                    "name": self.object.name,
                    "location_type": "park",
                    "latitude": form.cleaned_data.get("latitude"),
                    "longitude": form.cleaned_data.get("longitude"),
                    "street_address": form.cleaned_data.get("street_address", ""),
                    "city": form.cleaned_data.get("city", ""),
                    "state": form.cleaned_data.get("state", ""),
                    "country": form.cleaned_data.get("country", ""),
                    "postal_code": form.cleaned_data.get("postal_code", ""),
                }

                if self.object.location.exists():
                    location = self.object.location.first()
                    for key, value in location_data.items():
                        setattr(location, key, value)
                    location.save()
                else:
                    Location.objects.create(
                        content_type=ContentType.objects.get_for_model(Park),
                        object_id=self.object.id,
                        **location_data,
                    )

                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: ParkForm) -> HttpResponse:
        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) -> str:
        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: Optional[QuerySet[ParkArea]] = None) -> ParkArea:
        if queryset is None:
            queryset = self.get_queryset()
        park_slug = self.kwargs.get("park_slug")
        area_slug = self.kwargs.get("area_slug")
        if park_slug is None or area_slug is None:
            raise ObjectDoesNotExist("Missing slug")
        area, _ = ParkArea.get_by_slug(area_slug)
        if area.park.slug != park_slug:
            raise ObjectDoesNotExist("Park slug doesn't match")
        return area

    def get_context_data(self, **kwargs: Any) -> dict[str, Any]:
        context = super().get_context_data(**kwargs)
        return context

    def get_redirect_url_pattern(self) -> str:
        return "parks:park_detail"

    def get_redirect_url_kwargs(self) -> dict[str, str]:
        area = cast(ParkArea, self.object)
        return {"park_slug": area.park.slug, "area_slug": area.slug}