from typing import Any, Optional, Tuple, Type, cast, Union, Dict, Callable
from django.views.generic import DetailView, ListView, CreateView, UpdateView
from django.shortcuts import get_object_or_404
from django.urls import reverse
from django.contrib.auth.mixins import LoginRequiredMixin
from django.contrib.contenttypes.models import ContentType
from django.contrib import messages
from django.http import HttpResponseRedirect, Http404, JsonResponse, HttpResponse
from django.db.models import Count, Sum, Q, QuerySet, Model
from django.contrib.auth import get_user_model
from .models import Company, Manufacturer
from .forms import CompanyForm, ManufacturerForm
from rides.models import Ride
from parks.models import Park
from location.models import Location
from core.views import SlugRedirectMixin
from moderation.mixins import EditSubmissionMixin, PhotoSubmissionMixin, HistoryMixin
from moderation.models import EditSubmission

User = get_user_model()

ModelType = Union[Type[Company], Type[Manufacturer]]

def get_company_parks(company: Company) -> QuerySet[Park]:
    """Get parks owned by a company with related data."""
    return Park.objects.filter(
        owner=company
    ).select_related('owner')

def get_company_ride_count(parks: QuerySet[Park]) -> int:
    """Get total number of rides across all parks."""
    return Ride.objects.filter(park__in=parks).count()

def get_manufacturer_rides(manufacturer: Manufacturer) -> QuerySet[Ride]:
    """Get rides made by a manufacturer with related data."""
    return Ride.objects.filter(
        manufacturer=manufacturer
    ).select_related('park', 'coaster_stats')

def get_manufacturer_stats(rides: QuerySet[Ride]) -> Dict[str, int]:
    """Get statistics for manufacturer rides."""
    return {
        'coaster_count': rides.filter(category='ROLLER_COASTER').count(),
        'parks_count': rides.values('park').distinct().count()
    }

def handle_submission_post(
    request: Any,
    handle_photo_submission: Callable[[Any], HttpResponse],
    super_post: Callable[..., HttpResponse],
    *args: Any,
    **kwargs: Any
) -> HttpResponse:
    """Handle POST requests for photos and edits."""
    if request.FILES:
        # Handle photo submission
        return handle_photo_submission(request)
    # Handle edit submission
    return super_post(request, *args, **kwargs)

# List Views
class CompanyListView(ListView):
    model: Type[Company] = Company
    template_name = "companies/company_list.html"
    context_object_name = "companies"
    paginate_by = 12

    def get_queryset(self) -> QuerySet[Company]:
        queryset = self.model.objects.all()

        if country := self.request.GET.get("country"):
            # Get companies that have locations in the specified country
            company_ids = Location.objects.filter(
                content_type=ContentType.objects.get_for_model(Company),
                country__iexact=country,
            ).values_list("object_id", flat=True)
            queryset = queryset.filter(pk__in=company_ids)

        if search := self.request.GET.get("search"):
            queryset = queryset.filter(name__icontains=search)

        return queryset.order_by("name")

    def get_context_data(self, **kwargs: Any) -> dict[str, Any]:
        context = super().get_context_data(**kwargs)
        # Add filter values to context
        context["country"] = self.request.GET.get("country", "")
        context["search"] = self.request.GET.get("search", "")
        return context


class ManufacturerListView(ListView):
    model: Type[Manufacturer] = Manufacturer
    template_name = "companies/manufacturer_list.html"
    context_object_name = "manufacturers"
    paginate_by = 12

    def get_queryset(self) -> QuerySet[Manufacturer]:
        queryset = self.model.objects.all()

        if country := self.request.GET.get("country"):
            # Get manufacturers that have locations in the specified country
            manufacturer_ids = Location.objects.filter(
                content_type=ContentType.objects.get_for_model(Manufacturer),
                country__iexact=country,
            ).values_list("object_id", flat=True)
            queryset = queryset.filter(pk__in=manufacturer_ids)

        if search := self.request.GET.get("search"):
            queryset = queryset.filter(name__icontains=search)

        return queryset.order_by("name")

    def get_context_data(self, **kwargs: Any) -> dict[str, Any]:
        context = super().get_context_data(**kwargs)
        # Add stats for filtering
        context["total_manufacturers"] = self.model.objects.count()
        context["total_rides"] = Ride.objects.filter(manufacturer__isnull=False).count()
        context["total_roller_coasters"] = Ride.objects.filter(
            manufacturer__isnull=False, category="ROLLER_COASTER"
        ).count()
        # Add filter values to context
        context["country"] = self.request.GET.get("country", "")
        context["search"] = self.request.GET.get("search", "")
        return context


# Detail Views
class CompanyDetailView(SlugRedirectMixin, EditSubmissionMixin, PhotoSubmissionMixin, HistoryMixin, DetailView):
    model: Type[Company] = Company
    template_name = 'companies/company_detail.html'
    context_object_name = 'company'

    def get_object(self, queryset: Optional[QuerySet[Company]] = None) -> Company:
        if queryset is None:
            queryset = self.get_queryset()
        slug = self.kwargs.get(self.slug_url_kwarg)
        try:
            # Try to get by current or historical slug
            model = cast(Type[Company], self.model)
            obj, _ = model.get_by_slug(slug)
            return obj
        except model.DoesNotExist as e:
            raise Http404(f"No {model._meta.verbose_name} found matching the query") from e

    def get_context_data(self, **kwargs: Any) -> dict[str, Any]:
        context = super().get_context_data(**kwargs)
        company = cast(Company, self.object)
        
        parks = get_company_parks(company)
        context['parks'] = parks
        context['total_rides'] = get_company_ride_count(parks)
        return context

    def get_redirect_url_pattern(self) -> str:
        return 'companies:company_detail'

    def post(self, request: Any, *args: Any, **kwargs: Any) -> HttpResponse:
        """Handle POST requests for photos and edits."""
        return handle_submission_post(
            request,
            self.handle_photo_submission,
            super().post,
            *args,
            **kwargs
        )

class ManufacturerDetailView(SlugRedirectMixin, EditSubmissionMixin, PhotoSubmissionMixin, HistoryMixin, DetailView):
    model: Type[Manufacturer] = Manufacturer
    template_name = 'companies/manufacturer_detail.html'
    context_object_name = 'manufacturer'

    def get_object(self, queryset: Optional[QuerySet[Manufacturer]] = None) -> Manufacturer:
        if queryset is None:
            queryset = self.get_queryset()
        slug = self.kwargs.get(self.slug_url_kwarg)
        try:
            # Try to get by current or historical slug
            model = cast(Type[Manufacturer], self.model)
            obj, _ = model.get_by_slug(slug)
            return obj
        except model.DoesNotExist as e:
            raise Http404(f"No {model._meta.verbose_name} found matching the query") from e

    def get_context_data(self, **kwargs: Any) -> dict[str, Any]:
        context = super().get_context_data(**kwargs)
        manufacturer = cast(Manufacturer, self.object)
        
        rides = get_manufacturer_rides(manufacturer)
        context['rides'] = rides
        context.update(get_manufacturer_stats(rides))
        return context

    def get_redirect_url_pattern(self) -> str:
        return 'companies:manufacturer_detail'

    def post(self, request: Any, *args: Any, **kwargs: Any) -> HttpResponse:
        """Handle POST requests for photos and edits."""
        return handle_submission_post(
            request,
            self.handle_photo_submission,
            super().post,
            *args,
            **kwargs
        )


def _handle_submission(
    request: Any, form: Any, model: ModelType, success_url: str = ""
) -> HttpResponseRedirect:
    """Helper method to handle form submissions"""
    cleaned_data = form.cleaned_data.copy()
    submission = EditSubmission.objects.create(
        user=request.user,
        content_type=ContentType.objects.get_for_model(model),
        submission_type="CREATE",
        status="NEW",
        changes=cleaned_data,
        reason=request.POST.get("reason", ""),
        source=request.POST.get("source", ""),
    )

    # Get user role safely
    user_role = getattr(request.user, "role", None)

    # If user is moderator or above, auto-approve
    if user_role in ["MODERATOR", "ADMIN", "SUPERUSER"]:
        obj = form.save()
        submission.object_id = obj.pk
        submission.status = "APPROVED"
        submission.handled_by = request.user
        submission.save()
        
        # Generate success URL if not provided
        if not success_url:
            success_url = reverse(
                f"companies:{model.__name__.lower()}_detail", kwargs={"slug": obj.slug}
            )
        messages.success(request, f'Successfully created {getattr(obj, "name", "")}')
        return HttpResponseRedirect(success_url)

    messages.success(request, "Your submission has been sent for review")
    return HttpResponseRedirect(reverse(f"companies:{model.__name__.lower()}_list"))


# Create Views
class CompanyCreateView(LoginRequiredMixin, CreateView):
    model: Type[Company] = Company
    form_class = CompanyForm
    template_name = "companies/company_form.html"
    object: Optional[Company]

    def form_valid(self, form: CompanyForm) -> HttpResponseRedirect:
        return _handle_submission(self.request, form, self.model, "")

    def get_success_url(self) -> str:
        if self.object is None:
            return reverse("companies:company_list")
        return reverse("companies:company_detail", kwargs={"slug": self.object.slug})


class ManufacturerCreateView(LoginRequiredMixin, CreateView):
    model: Type[Manufacturer] = Manufacturer
    form_class = ManufacturerForm
    template_name = "companies/manufacturer_form.html"
    object: Optional[Manufacturer]

    def form_valid(self, form: ManufacturerForm) -> HttpResponseRedirect:
        return _handle_submission(self.request, form, self.model, "")

    def get_success_url(self) -> str:
        if self.object is None:
            return reverse("companies:manufacturer_list")
        return reverse(
            "companies:manufacturer_detail", kwargs={"slug": self.object.slug}
        )


def _handle_update(
    request: Any, form: Any, obj: Union[Company, Manufacturer], model: ModelType
) -> HttpResponseRedirect:
    """Helper method to handle update submissions"""
    cleaned_data = form.cleaned_data.copy()
    submission = EditSubmission.objects.create(
        user=request.user,
        content_type=ContentType.objects.get_for_model(model),
        object_id=obj.pk,
        submission_type="EDIT",
        changes=cleaned_data,
        reason=request.POST.get("reason", ""),
        source=request.POST.get("source", ""),
    )

    # Get user role safely
    user_role = getattr(request.user, "role", None)

    # If user is moderator or above, auto-approve
    if user_role in ["MODERATOR", "ADMIN", "SUPERUSER"]:
        obj = form.save()
        submission.status = "APPROVED"
        submission.handled_by = request.user
        submission.save()
        messages.success(request, f'Successfully updated {getattr(obj, "name", "")}')
        return HttpResponseRedirect(
            reverse(
                f"companies:{model.__name__.lower()}_detail",
                kwargs={"slug": getattr(obj, "slug", "")},
            )
        )

    messages.success(
        request, f'Your changes to {getattr(obj, "name", "")} have been sent for review'
    )
    return HttpResponseRedirect(
        reverse(
            f"companies:{model.__name__.lower()}_detail",
            kwargs={"slug": getattr(obj, "slug", "")},
        )
    )


# Update Views
class CompanyUpdateView(LoginRequiredMixin, UpdateView):
    model: Type[Company] = Company
    form_class = CompanyForm
    template_name = "companies/company_form.html"
    object: Optional[Company]

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

    def form_valid(self, form: CompanyForm) -> HttpResponseRedirect:
        if self.object is None:
            return HttpResponseRedirect(reverse("companies:company_list"))
        return _handle_update(self.request, form, self.object, self.model)

    def get_success_url(self) -> str:
        if self.object is None:
            return reverse("companies:company_list")
        return reverse("companies:company_detail", kwargs={"slug": self.object.slug})


class ManufacturerUpdateView(LoginRequiredMixin, UpdateView):
    model: Type[Manufacturer] = Manufacturer
    form_class = ManufacturerForm
    template_name = "companies/manufacturer_form.html"
    object: Optional[Manufacturer]

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

    def form_valid(self, form: ManufacturerForm) -> HttpResponseRedirect:
        if self.object is None:
            return HttpResponseRedirect(reverse("companies:manufacturer_list"))
        return _handle_update(self.request, form, self.object, self.model)

    def get_success_url(self) -> str:
        if self.object is None:
            return reverse("companies:manufacturer_list")
        return reverse(
            "companies:manufacturer_detail", kwargs={"slug": self.object.slug}
        )