from django.contrib.auth.decorators import login_required
from django.core.paginator import Paginator
from django.db.models import Q
from django.shortcuts import render

from .models import Department, Hospital, Organization, Patient, Staff


@login_required
def hospital_list(request):
    """Hospitals list view"""
    queryset = Hospital.objects.all()

    # Apply RBAC filters
    user = request.user
    if not user.is_px_admin() and user.hospital:
        queryset = queryset.filter(id=user.hospital.id)

    # Apply filters
    status_filter = request.GET.get('status')
    if status_filter:
        queryset = queryset.filter(status=status_filter)

    # Search
    search_query = request.GET.get('search')
    if search_query:
        queryset = queryset.filter(
            Q(name__icontains=search_query) |
            Q(name_ar__icontains=search_query) |
            Q(code__icontains=search_query)
        )

    # Ordering
    queryset = queryset.order_by('name')

    # Pagination
    page_size = int(request.GET.get('page_size', 25))
    paginator = Paginator(queryset, page_size)
    page_number = request.GET.get('page', 1)
    page_obj = paginator.get_page(page_number)

    context = {
        'page_obj': page_obj,
        'hospitals': page_obj.object_list,
        'filters': request.GET,
    }

    return render(request, 'organizations/hospital_list.html', context)


@login_required
def department_list(request):
    """Departments list view"""
    queryset = Department.objects.select_related('hospital', 'manager')

    # Apply RBAC filters
    user = request.user
    if not user.is_px_admin() and user.hospital:
        queryset = queryset.filter(hospital=user.hospital)

    # Apply filters
    hospital_filter = request.GET.get('hospital')
    if hospital_filter:
        queryset = queryset.filter(hospital_id=hospital_filter)

    status_filter = request.GET.get('status')
    if status_filter:
        queryset = queryset.filter(status=status_filter)

    # Search
    search_query = request.GET.get('search')
    if search_query:
        queryset = queryset.filter(
            Q(name__icontains=search_query) |
            Q(name_ar__icontains=search_query) |
            Q(code__icontains=search_query)
        )

    # Ordering
    queryset = queryset.order_by('hospital', 'name')

    # Pagination
    page_size = int(request.GET.get('page_size', 25))
    paginator = Paginator(queryset, page_size)
    page_number = request.GET.get('page', 1)
    page_obj = paginator.get_page(page_number)

    # Get hospitals for filter
    hospitals = Hospital.objects.filter(status='active')
    if not user.is_px_admin() and user.hospital:
        hospitals = hospitals.filter(id=user.hospital.id)

    context = {
        'page_obj': page_obj,
        'departments': page_obj.object_list,
        'hospitals': hospitals,
        'filters': request.GET,
    }

    return render(request, 'organizations/department_list.html', context)


@login_required
def staff_list(request):
    """Staff list view"""
    queryset = Staff.objects.select_related('hospital', 'department', 'user')

    # Apply RBAC filters
    user = request.user
    if not user.is_px_admin() and user.hospital:
        queryset = queryset.filter(hospital=user.hospital)

    # Apply filters
    hospital_filter = request.GET.get('hospital')
    if hospital_filter:
        queryset = queryset.filter(hospital_id=hospital_filter)

    department_filter = request.GET.get('department')
    if department_filter:
        queryset = queryset.filter(department_id=department_filter)

    status_filter = request.GET.get('status')
    if status_filter:
        queryset = queryset.filter(status=status_filter)

    staff_type_filter = request.GET.get('staff_type')
    if staff_type_filter:
        queryset = queryset.filter(staff_type=staff_type_filter)

    # Search
    search_query = request.GET.get('search')
    if search_query:
        queryset = queryset.filter(
            Q(first_name__icontains=search_query) |
            Q(last_name__icontains=search_query) |
            Q(employee_id__icontains=search_query) |
            Q(license_number__icontains=search_query) |
            Q(specialization__icontains=search_query) |
            Q(job_title__icontains=search_query)
        )

    # Ordering
    queryset = queryset.order_by('last_name', 'first_name')

    # Pagination
    page_size = int(request.GET.get('page_size', 25))
    paginator = Paginator(queryset, page_size)
    page_number = request.GET.get('page', 1)
    page_obj = paginator.get_page(page_number)

    # Get hospitals for filter
    hospitals = Hospital.objects.filter(status='active')
    if not user.is_px_admin() and user.hospital:
        hospitals = hospitals.filter(id=user.hospital.id)

    context = {
        'page_obj': page_obj,
        'staff': page_obj.object_list,
        'hospitals': hospitals,
        'filters': request.GET,
    }

    return render(request, 'organizations/staff_list.html', context)


@login_required
def organization_list(request):
    """Organizations list view"""
    queryset = Organization.objects.all()

    # Apply RBAC filters
    user = request.user
    if not user.is_px_admin() and user.hospital and user.hospital.organization:
        queryset = queryset.filter(id=user.hospital.organization.id)

    # Apply filters
    status_filter = request.GET.get('status')
    if status_filter:
        queryset = queryset.filter(status=status_filter)

    city_filter = request.GET.get('city')
    if city_filter:
        queryset = queryset.filter(city__icontains=city_filter)

    # Search
    search_query = request.GET.get('search')
    if search_query:
        queryset = queryset.filter(
            Q(name__icontains=search_query) |
            Q(name_ar__icontains=search_query) |
            Q(code__icontains=search_query) |
            Q(license_number__icontains=search_query)
        )

    # Ordering
    queryset = queryset.order_by('name')

    # Pagination
    page_size = int(request.GET.get('page_size', 25))
    paginator = Paginator(queryset, page_size)
    page_number = request.GET.get('page', 1)
    page_obj = paginator.get_page(page_number)

    context = {
        'page_obj': page_obj,
        'organizations': page_obj.object_list,
        'filters': request.GET,
    }

    return render(request, 'organizations/organization_list.html', context)


@login_required
def organization_detail(request, pk):
    """Organization detail view"""
    organization = Organization.objects.get(pk=pk)

    # Apply RBAC filters
    user = request.user
    if not user.is_px_admin():
        if user.hospital and user.hospital.organization:
            if organization.id != user.hospital.organization.id:
                # User doesn't have access to this organization
                from django.http import HttpResponseForbidden
                return HttpResponseForbidden("You don't have permission to view this organization")
        else:
            from django.http import HttpResponseForbidden
            return HttpResponseForbidden("You don't have permission to view this organization")

    hospitals = organization.hospitals.all()

    context = {
        'organization': organization,
        'hospitals': hospitals,
    }

    return render(request, 'organizations/organization_detail.html', context)


@login_required
def organization_create(request):
    """Create organization view"""
    # Only PX Admins can create organizations
    user = request.user
    if not user.is_px_admin():
        from django.http import HttpResponseForbidden
        return HttpResponseForbidden("Only PX Admins can create organizations")

    if request.method == 'POST':
        name = request.POST.get('name')
        name_ar = request.POST.get('name_ar')
        code = request.POST.get('code')
        address = request.POST.get('address', '')
        city = request.POST.get('city', '')
        phone = request.POST.get('phone', '')
        email = request.POST.get('email', '')
        website = request.POST.get('website', '')
        license_number = request.POST.get('license_number', '')
        status = request.POST.get('status', 'active')

        if name and code:
            organization = Organization.objects.create(
                name=name,
                name_ar=name_ar or name,
                code=code,
                address=address,
                city=city,
                phone=phone,
                email=email,
                website=website,
                license_number=license_number,
                status=status
            )

            # Redirect to organization detail
            from django.shortcuts import redirect
            return redirect('organizations:organization_detail', pk=organization.id)

    return render(request, 'organizations/organization_form.html')


@login_required
def patient_list(request):
    """Patients list view"""
    queryset = Patient.objects.select_related('primary_hospital')

    # Apply RBAC filters
    user = request.user
    if not user.is_px_admin() and user.hospital:
        queryset = queryset.filter(primary_hospital=user.hospital)

    # Apply filters
    hospital_filter = request.GET.get('hospital')
    if hospital_filter:
        queryset = queryset.filter(primary_hospital_id=hospital_filter)

    status_filter = request.GET.get('status')
    if status_filter:
        queryset = queryset.filter(status=status_filter)

    # Search
    search_query = request.GET.get('search')
    if search_query:
        queryset = queryset.filter(
            Q(mrn__icontains=search_query) |
            Q(first_name__icontains=search_query) |
            Q(last_name__icontains=search_query) |
            Q(national_id__icontains=search_query) |
            Q(phone__icontains=search_query)
        )

    # Ordering
    queryset = queryset.order_by('last_name', 'first_name')

    # Pagination
    page_size = int(request.GET.get('page_size', 25))
    paginator = Paginator(queryset, page_size)
    page_number = request.GET.get('page', 1)
    page_obj = paginator.get_page(page_number)

    # Get hospitals for filter
    hospitals = Hospital.objects.filter(status='active')
    if not user.is_px_admin() and user.hospital:
        hospitals = hospitals.filter(id=user.hospital.id)

    context = {
        'page_obj': page_obj,
        'patients': page_obj.object_list,
        'hospitals': hospitals,
        'filters': request.GET,
    }

    return render(request, 'organizations/patient_list.html', context)