from typing import Any, Dict, Optional, Tuple, Union, cast
from django.views.generic import DetailView, ListView, CreateView, UpdateView
from django.shortcuts import get_object_or_404
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,
    Http404,
    HttpRequest,
    HttpResponse,
)
from django.db.models import Count
from django.core.files.uploadedfile import UploadedFile
from django.forms import ModelForm
from .models import Ride, RollerCoasterStats
from .forms import RideForm
from parks.models import Park
from core.views import SlugRedirectMixin
from moderation.mixins import EditSubmissionMixin, PhotoSubmissionMixin, HistoryMixin
from moderation.models import EditSubmission
from media.models import Photo
from accounts.models import User


def is_privileged_user(user: Any) -> bool:
    """Check if the user has privileged access.

    Args:
        user: The user to check

    Returns:
        bool: True if user has privileged or higher privileges
    """
    return isinstance(user, User) and user.role in ["MODERATOR", "ADMIN", "SUPERUSER"]


def handle_photo_uploads(request: HttpRequest, ride: Ride) -> int:
    """Handle photo uploads for a ride.

    Args:
        request: The HTTP request containing files
        ride: The ride to attach photos to

    Returns:
        int: Number of successfully uploaded photos
    """
    uploaded_count = 0
    photos = request.FILES.getlist("photos")
    for photo_file in photos:
        try:
            Photo.objects.create(
                image=photo_file,
                uploaded_by=request.user,
                content_type=ContentType.objects.get_for_model(Ride),
                object_id=ride.pk,
            )
            uploaded_count += 1
        except Exception as e:
            messages.error(request, f"Error uploading photo {photo_file.name}: {str(e)}")
    return uploaded_count


def prepare_form_data(cleaned_data: Dict[str, Any], park: Park) -> Dict[str, Any]:
    """Prepare form data for submission.

    Args:
        cleaned_data: The form's cleaned data
        park: The park instance

    Returns:
        Dict[str, Any]: Processed form data ready for submission
    """
    data = cleaned_data.copy()
    data["park"] = park.pk
    if data.get("park_area"):
        data["park_area"] = data["park_area"].pk
    if data.get("manufacturer"):
        data["manufacturer"] = data["manufacturer"].pk
    return data


def handle_form_errors(request: HttpRequest, form: ModelForm) -> None:
    """Handle form validation errors by adding appropriate error messages.
    
    Args:
        request: The HTTP request
        form: The form containing validation errors
    """
    messages.error(
        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(request, f"{field}: {error}")


def create_edit_submission(
    request: HttpRequest,
    submission_type: str,
    changes: Dict[str, Any],
    object_id: Optional[int] = None,
) -> EditSubmission:
    """Create an EditSubmission object for ride changes.
    
    Args:
        request: The HTTP request
        submission_type: Type of submission (CREATE or EDIT)
        changes: The changes to be submitted
        object_id: Optional ID of the existing object for edits
        
    Returns:
        EditSubmission: The created submission object
    """
    submission_data = {
        "user": request.user,
        "content_type": ContentType.objects.get_for_model(Ride),
        "submission_type": submission_type,
        "changes": changes,
        "reason": request.POST.get("reason", ""),
        "source": request.POST.get("source", ""),
    }
    
    if object_id is not None:
        submission_data["object_id"] = object_id
        
    return EditSubmission.objects.create(**submission_data)


def handle_privileged_save(
    request: HttpRequest, form: RideForm, submission: EditSubmission
) -> Tuple[bool, str]:
    """Handle saving form and updating submission for privileged users.
    
    Args:
        request: The HTTP request
        form: The form to save
        submission: The edit submission to update
        
    Returns:
        Tuple[bool, str]: Success status and error message (empty string if successful)
    """
    try:
        ride = form.save()
        if submission.submission_type == "CREATE":
            submission.object_id = ride.pk
        submission.status = "APPROVED"
        submission.handled_by = request.user
        submission.save()
        return True, ""
    except Exception as e:
        error_msg = (
            f"Error {submission.submission_type.lower()}ing ride: {str(e)}. "
            "Please check your input and try again."
        )
        return False, error_msg


class SingleCategoryListView(ListView):
    model = Ride
    template_name = "rides/ride_category_list.html"
    context_object_name = "categories"

    def get_category_code(self) -> str:
        if category := self.kwargs.get("category"):
            return category
        raise Http404("Category not found")

    def get_queryset(self):
        category_code = self.get_category_code()
        category_name = dict(Ride.CATEGORY_CHOICES)[category_code]

        rides = (
            Ride.objects.filter(category=category_code)
            .select_related("park", "manufacturer")
            .order_by("name")
        )

        return {category_name: rides} if rides.exists() else {}

    def get_context_data(self, **kwargs) -> Dict[str, Any]:
        context = super().get_context_data(**kwargs)
        category_code = self.get_category_code()
        category_name = dict(Ride.CATEGORY_CHOICES)[category_code]
        context["title"] = f"All {category_name}s"
        context["category_code"] = category_code
        return context


class ParkSingleCategoryListView(ListView):
    model = Ride
    template_name = "rides/ride_category_list.html"
    context_object_name = "categories"

    def setup(self, request: HttpRequest, *args: Any, **kwargs: Any) -> None:
        super().setup(request, *args, **kwargs)
        self.park = get_object_or_404(Park, slug=self.kwargs["park_slug"])

    def get_category_code(self) -> str:
        if category := self.kwargs.get("category"):
            return category
        raise Http404("Category not found")

    def get_queryset(self):
        category_code = self.get_category_code()
        category_name = dict(Ride.CATEGORY_CHOICES)[category_code]

        rides = (
            Ride.objects.filter(park=self.park, category=category_code)
            .select_related("manufacturer")
            .order_by("name")
        )

        return {category_name: rides} if rides.exists() else {}

    def get_context_data(self, **kwargs) -> Dict[str, Any]:
        context = super().get_context_data(**kwargs)
        context["park"] = self.park
        category_code = self.get_category_code()
        category_name = dict(Ride.CATEGORY_CHOICES)[category_code]
        context["title"] = f"{category_name}s at {self.park.name}"
        context["category_code"] = category_code
        return context


class RideCreateView(LoginRequiredMixin, CreateView):
    model = Ride
    form_class = RideForm
    template_name = "rides/ride_form.html"

    def setup(self, request: HttpRequest, *args: Any, **kwargs: Any) -> None:
        super().setup(request, *args, **kwargs)
        self.park = get_object_or_404(Park, slug=self.kwargs["park_slug"])

    def get_form_kwargs(self) -> Dict[str, Any]:
        kwargs = super().get_form_kwargs()
        kwargs["park"] = self.park
        return kwargs

    def handle_submission(
        self, form: RideForm, cleaned_data: Dict[str, Any]
    ) -> HttpResponseRedirect:
        """Handle the form submission.

        Args:
            form: The form to process
            cleaned_data: The cleaned form data

        Returns:
            HttpResponseRedirect to appropriate URL
        """
        submission = create_edit_submission(self.request, "CREATE", cleaned_data)

        if is_privileged_user(self.request.user):
            success, error_msg = handle_privileged_save(self.request, form, submission)
            if success:
                self.object = form.instance
                uploaded_count = handle_photo_uploads(self.request, self.object)
                messages.success(
                    self.request,
                    f"Successfully created {self.object.name} at {self.park.name}. "
                    f"Added {uploaded_count} photo(s).",
                )
                return HttpResponseRedirect(self.get_success_url())
            else:
                if error_msg:  # Only add error message if there is one
                    messages.error(self.request, error_msg)
                return cast(HttpResponseRedirect, self.form_invalid(form))

        messages.success(
            self.request,
            "Your ride submission has been sent for review. "
            "You will be notified when it is approved.",
        )
        return HttpResponseRedirect(
            reverse("parks:rides:ride_list", kwargs={"park_slug": self.park.slug})
        )

    def form_valid(self, form: RideForm) -> HttpResponseRedirect:
        form.instance.park = self.park
        cleaned_data = prepare_form_data(form.cleaned_data, self.park)
        return self.handle_submission(form, cleaned_data)

    def form_invalid(self, form: RideForm) -> Union[HttpResponse, HttpResponseRedirect]:
        """Handle invalid form submission.

        Args:
            form: The invalid form

        Returns:
            Response with error messages
        """
        handle_form_errors(self.request, form)
        return super().form_invalid(form)

    def get_success_url(self) -> str:
        return reverse(
            "parks:rides:ride_detail",
            kwargs={"park_slug": self.park.slug, "ride_slug": self.object.slug},
        )

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


class RideUpdateView(LoginRequiredMixin, UpdateView):
    model = Ride
    form_class = RideForm
    template_name = "rides/ride_form.html"
    slug_url_kwarg = "ride_slug"

    def setup(self, request: HttpRequest, *args: Any, **kwargs: Any) -> None:
        super().setup(request, *args, **kwargs)
        self.park = get_object_or_404(Park, slug=self.kwargs["park_slug"])

    def get_form_kwargs(self) -> Dict[str, Any]:
        kwargs = super().get_form_kwargs()
        kwargs["park"] = self.park
        return kwargs

    def get_context_data(self, **kwargs) -> Dict[str, Any]:
        context = super().get_context_data(**kwargs)
        context["park"] = self.park
        context["is_edit"] = True
        return context

    def handle_submission(
        self, form: RideForm, cleaned_data: Dict[str, Any]
    ) -> HttpResponseRedirect:
        """Handle the form submission.

        Args:
            form: The form to process
            cleaned_data: The cleaned form data

        Returns:
            HttpResponseRedirect to appropriate URL
        """
        submission = create_edit_submission(
            self.request, "EDIT", cleaned_data, self.object.pk
        )

        if is_privileged_user(self.request.user):
            success, error_msg = handle_privileged_save(self.request, form, submission)
            if success:
                self.object = form.instance
                uploaded_count = handle_photo_uploads(self.request, self.object)
                messages.success(
                    self.request,
                    f"Successfully updated {self.object.name}. "
                    f"Added {uploaded_count} new photo(s).",
                )
                return HttpResponseRedirect(self.get_success_url())
            else:
                if error_msg:  # Only add error message if there is one
                    messages.error(self.request, error_msg)
                return cast(HttpResponseRedirect, 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:rides:ride_detail",
                kwargs={"park_slug": self.park.slug, "ride_slug": self.object.slug},
            )
        )

    def form_valid(self, form: RideForm) -> HttpResponseRedirect:
        cleaned_data = prepare_form_data(form.cleaned_data, self.park)
        return self.handle_submission(form, cleaned_data)

    def form_invalid(self, form: RideForm) -> Union[HttpResponse, HttpResponseRedirect]:
        """Handle invalid form submission.

        Args:
            form: The invalid form

        Returns:
            Response with error messages
        """
        handle_form_errors(self.request, form)
        return super().form_invalid(form)

    def get_success_url(self) -> str:
        return reverse(
            "parks:rides:ride_detail",
            kwargs={"park_slug": self.park.slug, "ride_slug": self.object.slug},
        )


class RideDetailView(
    SlugRedirectMixin,
    EditSubmissionMixin,
    PhotoSubmissionMixin,
    HistoryMixin,
    DetailView,
):
    model = Ride
    template_name = "rides/ride_detail.html"
    context_object_name = "ride"
    slug_url_kwarg = "ride_slug"

    def get_object(self, queryset=None):
        if queryset is None:
            queryset = self.get_queryset()
        park_slug = self.kwargs.get("park_slug")
        ride_slug = self.kwargs.get("ride_slug")
        obj, is_old_slug = self.model.get_by_slug(ride_slug)  # type: ignore[attr-defined]
        if obj.park.slug != park_slug:
            raise self.model.DoesNotExist("Park slug doesn't match")
        return obj

    def get_context_data(self, **kwargs) -> Dict[str, Any]:
        context = super().get_context_data(**kwargs)
        if self.object.category == "RC":
            context["coaster_stats"] = RollerCoasterStats.objects.filter(
                ride=self.object
            ).first()
        return context

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

    def get_redirect_url_kwargs(self) -> Dict[str, Any]:
        return {"park_slug": self.object.park.slug, "ride_slug": self.object.slug}


class RideListView(ListView):
    model = Ride
    template_name = "rides/ride_list.html"
    context_object_name = "rides"

    def setup(self, request: HttpRequest, *args: Any, **kwargs: Any) -> None:
        super().setup(request, *args, **kwargs)
        self.park = None
        if "park_slug" in self.kwargs:
            self.park = get_object_or_404(Park, slug=self.kwargs["park_slug"])

    def get_queryset(self):
        queryset = Ride.objects.select_related(
            "park", "coaster_stats", "manufacturer"
        ).prefetch_related("photos")

        if self.park:
            queryset = queryset.filter(park=self.park)

        search = self.request.GET.get("search", "").strip() or None
        category = self.request.GET.get("category", "").strip() or None
        status = self.request.GET.get("status", "").strip() or None
        manufacturer = self.request.GET.get("manufacturer", "").strip() or None

        if search:
            if self.park:
                queryset = queryset.filter(name__icontains=search)
            else:
                queryset = queryset.filter(
                    Q(name__icontains=search) | Q(park__name__icontains=search)
                )
        if category:
            queryset = queryset.filter(category=category)
        if status:
            queryset = queryset.filter(status=status)
        if manufacturer:
            queryset = queryset.exclude(manufacturer__isnull=True)

        return queryset

    def get_context_data(self, **kwargs) -> Dict[str, Any]:
        context = super().get_context_data(**kwargs)
        context["park"] = self.park

        manufacturer_query = Ride.objects
        if self.park:
            manufacturer_query = manufacturer_query.filter(park=self.park)

        context["manufacturers"] = list(
            manufacturer_query.exclude(manufacturer__isnull=True)
            .values_list("manufacturer__name", flat=True)
            .distinct()
            .order_by("manufacturer__name")
        )

        context["current_filters"] = {
            "search": self.request.GET.get("search", ""),
            "category": self.request.GET.get("category", ""),
            "status": self.request.GET.get("status", ""),
            "manufacturer": self.request.GET.get("manufacturer", ""),
        }

        return context

    def get(self, request: HttpRequest, *args: Any, **kwargs: Any):
        if getattr(request, "htmx", False):  # type: ignore[attr-defined]
            self.template_name = "rides/partials/ride_list.html"
        return super().get(request, *args, **kwargs)