@role_required(['admin', 'campaign_manager', 'campaign_staff', 'system_admin', 'campaign_admin'], permission='core.view_voter')
def voter_advanced_search(request):
    """
    Advanced search for voters with multiple filters.
    """
    selected_tenant_id = request.session.get("tenant_id")
    if not selected_tenant_id:
        messages.warning(request, "Please select a campaign first.")
        return redirect("index")

    tenant = get_object_or_404(Tenant, id=selected_tenant_id)
    voters, form = get_filtered_voter_queryset(request, tenant)

    paginator = Paginator(voters, 50)
    page_number = request.GET.get('page')
    voters_page = paginator.get_page(page_number)

    context = {
        'form': form,
        'voters': voters_page,
        'selected_tenant': tenant,
        'call_form': ScheduledCallForm(tenant=tenant),
        'can_edit_voter': can_edit_voter(request.user, tenant),
    }
    
    # Pre-calculate markers for the map to avoid overhead in templates
    map_data = []
    # For performance, only map voters on the current page
    for voter in voters_page:
        if voter.latitude and voter.longitude:
            map_data.append({
                'lat': float(voter.latitude),
                'lng': float(voter.longitude),
                'voters': f"{voter.first_name} {voter.last_name}",
                'address': voter.address
            })
    context['map_data_json'] = json.dumps(map_data)
    
    return render(request, 'core/voter_advanced_search.html', context)