"""
Core views - Health check and utility views
"""
from django.contrib.auth.decorators import login_required
from django.db import connection
from django.http import JsonResponse
from django.shortcuts import redirect, render
from django.views.decorators.cache import never_cache
from django.views.decorators.http import require_GET, require_POST


@never_cache
@require_GET
def health_check(request):
    """
    Health check endpoint for monitoring and load balancers.
    Returns JSON with status of various services.
    """
    health_status = {
        'status': 'ok',
        'services': {}
    }

    # Check database connection
    try:
        with connection.cursor() as cursor:
            cursor.execute("SELECT 1")
        health_status['services']['database'] = 'ok'
    except Exception as e:
        health_status['status'] = 'error'
        health_status['services']['database'] = f'error: {str(e)}'

    # Check Redis/Celery (optional - don't fail if not available)
    try:
        from django_celery_beat.models import PeriodicTask
        PeriodicTask.objects.count()
        health_status['services']['celery_beat'] = 'ok'
    except Exception:
        health_status['services']['celery_beat'] = 'not_configured'

    # Return appropriate status code
    status_code = 200 if health_status['status'] == 'ok' else 503

    return JsonResponse(health_status, status=status_code)


@login_required
def select_hospital(request):
    """
    Hospital selection page for PX Admins.

    Allows PX Admins to switch between hospitals.
    Stores selected hospital in session.
    """
    # Only PX Admins should access this page
    if not request.user.is_px_admin():
        return redirect('dashboard:dashboard')

    from apps.organizations.models import Hospital

    hospitals = Hospital.objects.all().order_by('name')

    # Handle hospital selection
    if request.method == 'POST':
        hospital_id = request.POST.get('hospital_id')
        if hospital_id:
            try:
                hospital = Hospital.objects.get(id=hospital_id)
                request.session['selected_hospital_id'] = str(hospital.id)
                # Redirect to referring page or dashboard
                next_url = request.POST.get('next', request.GET.get('next', '/'))
                return redirect(next_url)
            except Hospital.DoesNotExist:
                pass

    context = {
        'hospitals': hospitals,
        'selected_hospital_id': request.session.get('selected_hospital_id'),
        'next': request.GET.get('next', '/'),
    }

    return render(request, 'core/select_hospital.html', context)


@login_required
def no_hospital_assigned(request):
    """
    Error page for users without a hospital assigned.

    Users without a hospital assignment cannot access the system.
    """
    return render(request, 'core/no_hospital_assigned.html', status=403)