from django.views.generic import ListView, TemplateView
from django.shortcuts import get_object_or_404, render
from django.http import HttpResponse, JsonResponse, HttpRequest
from django.contrib.auth.mixins import LoginRequiredMixin, UserPassesTestMixin
from django.contrib.auth.decorators import login_required
from django.template.loader import render_to_string
from django.db.models import Q, QuerySet
from django.core.exceptions import PermissionDenied
from typing import Optional, Any, Dict, List, Tuple, Union, cast
from django.db import models
from django.core.serializers.json import DjangoJSONEncoder
import json
from accounts.models import User

from .models import EditSubmission, PhotoSubmission
from parks.models import Park, ParkArea
from designers.models import Designer
from manufacturers.models import Manufacturer
from rides.models import RideModel
from location.models import Location

MODERATOR_ROLES = ['MODERATOR', 'ADMIN', 'SUPERUSER']

class ModeratorRequiredMixin(UserPassesTestMixin):
    request: HttpRequest

    def test_func(self) -> bool:
        """Check if user has moderator permissions."""
        user = cast(User, self.request.user)
        return user.is_authenticated and (user.role in MODERATOR_ROLES or user.is_superuser)

    def handle_no_permission(self) -> HttpResponse:
        if not self.request.user.is_authenticated:
            return super().handle_no_permission()
        raise PermissionDenied("You do not have moderator permissions.")

def get_filtered_queryset(request: HttpRequest, status: str, submission_type: str) -> QuerySet:
    """Get filtered queryset based on request parameters."""
    if submission_type == 'photo':
        return PhotoSubmission.objects.filter(status=status).order_by('-created_at')
    
    queryset = EditSubmission.objects.filter(status=status).order_by('-created_at')
    
    if type_filter := request.GET.get('type'):
        queryset = queryset.filter(submission_type=type_filter)
        
    if content_type := request.GET.get('content_type'):
        queryset = queryset.filter(content_type__model=content_type)
        
    return queryset

def get_context_data(request: HttpRequest, queryset: QuerySet) -> Dict[str, Any]:
    """Get common context data for views."""
    park_areas_by_park: Dict[int, List[Tuple[int, str]]] = {}
    
    if isinstance(queryset.first(), EditSubmission):
        for submission in queryset:
            if (submission.content_type.model == 'park' and 
                isinstance(submission.changes, dict) and 
                'park' in submission.changes):
                park_id = submission.changes['park']
                if park_id not in park_areas_by_park:
                    areas = ParkArea.objects.filter(park_id=park_id)
                    park_areas_by_park[park_id] = [(area.pk, str(area)) for area in areas]
    
    return {
        'submissions': queryset,
        'user': request.user,
        'parks': [(park.pk, str(park)) for park in Park.objects.all()],
        'designers': [(designer.pk, str(designer)) for designer in Designer.objects.all()],
        'manufacturers': [(manufacturer.pk, str(manufacturer)) for manufacturer in Manufacturer.objects.all()],
        'ride_models': [(model.pk, str(model)) for model in RideModel.objects.all()],
        'owners': [(user.pk, str(user)) for user in User.objects.filter(role__in=['OWNER', 'ADMIN', 'SUPERUSER'])],
        'park_areas_by_park': park_areas_by_park
    }

@login_required
def search_parks(request: HttpRequest) -> HttpResponse:
    """HTMX endpoint for searching parks in moderation dashboard"""
    user = cast(User, request.user)
    if not (user.role in MODERATOR_ROLES or user.is_superuser):
        return HttpResponse(status=403)
        
    query = request.GET.get('q', '').strip()
    submission_id = request.GET.get('submission_id')
    
    parks = Park.objects.all().order_by('name')
    if query:
        parks = parks.filter(name__icontains=query)
    parks = parks[:10]
    
    return render(request, 'moderation/partials/park_search_results.html', {
        'parks': parks,
        'search_term': query,
        'submission_id': submission_id
    })

@login_required
def search_manufacturers(request: HttpRequest) -> HttpResponse:
    """HTMX endpoint for searching manufacturers in moderation dashboard"""
    user = cast(User, request.user)
    if not (user.role in MODERATOR_ROLES or user.is_superuser):
        return HttpResponse(status=403)
        
    query = request.GET.get('q', '').strip()
    submission_id = request.GET.get('submission_id')
    
    manufacturers = Manufacturer.objects.all().order_by('name')
    if query:
        manufacturers = manufacturers.filter(name__icontains=query)
    manufacturers = manufacturers[:10]
    
    return render(request, 'moderation/partials/manufacturer_search_results.html', {
        'manufacturers': manufacturers,
        'search_term': query,
        'submission_id': submission_id
    })

@login_required
def search_designers(request: HttpRequest) -> HttpResponse:
    """HTMX endpoint for searching designers in moderation dashboard"""
    user = cast(User, request.user)
    if not (user.role in MODERATOR_ROLES or user.is_superuser):
        return HttpResponse(status=403)
        
    query = request.GET.get('q', '').strip()
    submission_id = request.GET.get('submission_id')
    
    designers = Designer.objects.all().order_by('name')
    if query:
        designers = designers.filter(name__icontains=query)
    designers = designers[:10]
    
    return render(request, 'moderation/partials/designer_search_results.html', {
        'designers': designers,
        'search_term': query,
        'submission_id': submission_id
    })

@login_required
def search_ride_models(request: HttpRequest) -> HttpResponse:
    """HTMX endpoint for searching ride models in moderation dashboard"""
    user = cast(User, request.user)
    if not (user.role in MODERATOR_ROLES or user.is_superuser):
        return HttpResponse(status=403)
        
    query = request.GET.get('q', '').strip()
    submission_id = request.GET.get('submission_id')
    manufacturer_id = request.GET.get('manufacturer')
    
    queryset = RideModel.objects.all()
    if manufacturer_id:
        queryset = queryset.filter(manufacturer_id=manufacturer_id)
    if query:
        queryset = queryset.filter(name__icontains=query)
    queryset = queryset.order_by('name')[:10]
    
    return render(request, 'moderation/partials/ride_model_search_results.html', {
        'ride_models': queryset,
        'search_term': query,
        'submission_id': submission_id
    })

class DashboardView(LoginRequiredMixin, ModeratorRequiredMixin, ListView):
    template_name = 'moderation/dashboard.html'
    context_object_name = 'submissions'
    paginate_by = 10
    
    def get_template_names(self) -> List[str]:
        if self.request.headers.get('HX-Request'):
            return ['moderation/partials/dashboard_content.html']
        return [self.template_name]

    def get_queryset(self) -> QuerySet:
        status = self.request.GET.get('status', 'PENDING')
        submission_type = self.request.GET.get('submission_type', '')
        return get_filtered_queryset(self.request, status, submission_type)

@login_required
def submission_list(request: HttpRequest) -> HttpResponse:
    """View for submission list with filters"""
    user = cast(User, request.user)
    if not (user.role in MODERATOR_ROLES or user.is_superuser):
        return HttpResponse(status=403)
        
    status = request.GET.get('status', 'PENDING')
    submission_type = request.GET.get('submission_type', '')
    
    queryset = get_filtered_queryset(request, status, submission_type)
    
    # Process location data for park submissions
    for submission in queryset:
        if (submission.content_type.model == 'park' and 
            isinstance(submission.changes, dict)):
            # Extract location fields into a location object
            location_fields = ['latitude', 'longitude', 'street_address', 'city', 'state', 'postal_code', 'country']
            location_data = {field: submission.changes.get(field) for field in location_fields}
            # Add location data back as a single object
            submission.changes['location'] = location_data
    
    context = get_context_data(request, queryset)
    
    template_name = ('moderation/partials/dashboard_content.html' 
                    if request.headers.get('HX-Request') 
                    else 'moderation/dashboard.html')
    
    return render(request, template_name, context)

@login_required
def edit_submission(request: HttpRequest, submission_id: int) -> HttpResponse:
    """HTMX endpoint for editing a submission"""
    user = cast(User, request.user)
    if not (user.role in MODERATOR_ROLES or user.is_superuser):
        return HttpResponse(status=403)
        
    submission = get_object_or_404(EditSubmission, id=submission_id)
    
    if request.method != 'POST':
        return HttpResponse("Invalid request method", status=405)
        
    notes = request.POST.get('notes')
    if not notes:
        return HttpResponse("Notes are required when editing a submission", status=400)
        
    try:
        edited_changes = dict(submission.changes) if submission.changes else {}
        
        # Update stats if present
        if 'stats' in edited_changes:
            edited_stats = {}
            for key in edited_changes['stats']:
                if new_value := request.POST.get(f'stats.{key}'):
                    edited_stats[key] = new_value
            edited_changes['stats'] = edited_stats
            
        # Update location fields if present
        if submission.content_type.model == 'park':
            location_fields = ['latitude', 'longitude', 'street_address', 'city', 'state', 'postal_code', 'country']
            location_data = {}
            for field in location_fields:
                if new_value := request.POST.get(field):
                    if field in ['latitude', 'longitude']:
                        try:
                            location_data[field] = float(new_value)
                        except ValueError:
                            return HttpResponse(f"Invalid value for {field}", status=400)
                    else:
                        location_data[field] = new_value
            if location_data:
                edited_changes.update(location_data)
            
        # Update other fields
        for field in edited_changes:
            if field == 'stats' or field in ['latitude', 'longitude', 'street_address', 'city', 'state', 'postal_code', 'country']:
                continue
                
            if new_value := request.POST.get(field):
                if field in ['size_acres']:
                    try:
                        edited_changes[field] = float(new_value)
                    except ValueError:
                        return HttpResponse(f"Invalid value for {field}", status=400)
                else:
                    edited_changes[field] = new_value
        
        # Convert to JSON-serializable format
        json_changes = json.loads(json.dumps(edited_changes, cls=DjangoJSONEncoder))
        submission.moderator_changes = json_changes
        submission.notes = notes
        submission.save()
        
        # Process location data for display
        if submission.content_type.model == 'park':
            location_fields = ['latitude', 'longitude', 'street_address', 'city', 'state', 'postal_code', 'country']
            location_data = {field: json_changes.get(field) for field in location_fields}
            # Add location data back as a single object
            json_changes['location'] = location_data
            submission.changes = json_changes
        
        context = get_context_data(request, EditSubmission.objects.filter(id=submission_id))
        return render(request, 'moderation/partials/submission_list.html', context)
            
    except Exception as e:
        return HttpResponse(str(e), status=400)

@login_required
def approve_submission(request: HttpRequest, submission_id: int) -> HttpResponse:
    """HTMX endpoint for approving a submission"""
    user = cast(User, request.user)
    submission = get_object_or_404(EditSubmission, id=submission_id)
    
    if not ((submission.status != 'ESCALATED' and user.role in MODERATOR_ROLES) or 
            user.role in ['ADMIN', 'SUPERUSER'] or user.is_superuser):
        return HttpResponse("Insufficient permissions", status=403)
    
    try:
        submission.approve(user)
        _update_submission_notes(submission, request.POST.get('notes'))
        
        status = request.GET.get('status', 'PENDING')
        submission_type = request.GET.get('submission_type', '')
        queryset = get_filtered_queryset(request, status, submission_type)
        
        return render(request, 'moderation/partials/dashboard_content.html', {
            'submissions': queryset,
            'user': request.user,
        })
    except ValueError as e:
        return HttpResponse(str(e), status=400)

@login_required
def reject_submission(request: HttpRequest, submission_id: int) -> HttpResponse:
    """HTMX endpoint for rejecting a submission"""
    user = cast(User, request.user)
    submission = get_object_or_404(EditSubmission, id=submission_id)

    if not ((submission.status != 'ESCALATED' and user.role in MODERATOR_ROLES) or 
            user.role in ['ADMIN', 'SUPERUSER'] or user.is_superuser):
        return HttpResponse("Insufficient permissions", status=403)

    submission.reject(user)
    _update_submission_notes(submission, request.POST.get('notes'))

    status = request.GET.get('status', 'PENDING')
    submission_type = request.GET.get('submission_type', '')
    queryset = get_filtered_queryset(request, status, submission_type)
    context = get_context_data(request, queryset)
    
    return render(request, 'moderation/partials/submission_list.html', context)

@login_required
def escalate_submission(request: HttpRequest, submission_id: int) -> HttpResponse:
    """HTMX endpoint for escalating a submission"""
    user = cast(User, request.user)
    if not (user.role in MODERATOR_ROLES or user.is_superuser):
        return HttpResponse(status=403)

    submission = get_object_or_404(EditSubmission, id=submission_id)
    if submission.status == "ESCALATED":
        return HttpResponse("Submission is already escalated", status=400)

    submission.escalate(user)
    _update_submission_notes(submission, request.POST.get("notes"))

    status = request.GET.get("status", "PENDING")
    submission_type = request.GET.get("submission_type", "")
    queryset = get_filtered_queryset(request, status, submission_type)
    
    return render(request, "moderation/partials/dashboard_content.html", {
        "submissions": queryset,
        "user": request.user,
    })

@login_required
def approve_photo(request: HttpRequest, submission_id: int) -> HttpResponse:
    """HTMX endpoint for approving a photo submission"""
    user = cast(User, request.user)
    if not (user.role in MODERATOR_ROLES or user.is_superuser):
        return HttpResponse(status=403)

    submission = get_object_or_404(PhotoSubmission, id=submission_id)
    try:
        submission.approve(user, request.POST.get("notes", ""))
        return render(request, "moderation/partials/photo_submission.html", 
                     {"submission": submission})
    except Exception as e:
        return HttpResponse(str(e), status=400)

@login_required
def reject_photo(request: HttpRequest, submission_id: int) -> HttpResponse:
    """HTMX endpoint for rejecting a photo submission"""
    user = cast(User, request.user)
    if not (user.role in MODERATOR_ROLES or user.is_superuser):
        return HttpResponse(status=403)

    submission = get_object_or_404(PhotoSubmission, id=submission_id)
    submission.reject(user, request.POST.get("notes", ""))

    return render(request, "moderation/partials/photo_submission.html", 
                 {"submission": submission})

def _update_submission_notes(submission: EditSubmission, notes: Optional[str]) -> None:
    """Update submission notes if provided."""
    if notes:
        submission.notes = notes
        submission.save()