"""
API views for package integration.

This module provides API endpoints for package-related operations.
"""

from django.contrib.auth.decorators import login_required
from django.http import JsonResponse
from django.views import View
from django.contrib.auth.mixins import LoginRequiredMixin

from .package_integration_service import PackageIntegrationService


class AvailablePackagesAPIView(LoginRequiredMixin, View):
    """
    API endpoint to get available packages for a patient.
    
    Returns JSON list of packages with remaining sessions.
    """
    
    def get(self, request):
        """Get available packages for patient."""
        patient_id = request.GET.get('patient')
        clinic_id = request.GET.get('clinic')
        
        if not patient_id:
            return JsonResponse({
                'success': False,
                'error': 'Patient ID is required'
            }, status=400)
        
        try:
            from core.models import Patient, Clinic
            
            # Get patient
            patient = Patient.objects.get(
                id=patient_id,
                tenant=request.user.tenant
            )
            
            # Get clinic if provided
            clinic = None
            if clinic_id:
                clinic = Clinic.objects.get(
                    id=clinic_id,
                    tenant=request.user.tenant
                )
            
            # Get available packages
            packages = PackageIntegrationService.get_available_packages_for_patient(
                patient=patient,
                clinic=clinic
            )
            
            # Build response
            packages_data = []
            for pkg in packages:
                packages_data.append({
                    'id': str(pkg.id),
                    'package_id': str(pkg.package.id),
                    'package_name': pkg.package.name_en,
                    'package_name_ar': pkg.package.name_ar if pkg.package.name_ar else '',
                    'total_sessions': pkg.total_sessions,
                    'sessions_used': pkg.sessions_used,
                    'sessions_remaining': pkg.sessions_remaining,
                    'purchase_date': pkg.purchase_date.isoformat(),
                    'expiry_date': pkg.expiry_date.isoformat(),
                    'is_expired': pkg.is_expired,
                    'status': pkg.status,
                })
            
            return JsonResponse({
                'success': True,
                'packages': packages_data,
                'count': len(packages_data)
            })
            
        except Patient.DoesNotExist:
            return JsonResponse({
                'success': False,
                'error': 'Patient not found'
            }, status=404)
        except Clinic.DoesNotExist:
            return JsonResponse({
                'success': False,
                'error': 'Clinic not found'
            }, status=404)
        except Exception as e:
            return JsonResponse({
                'success': False,
                'error': str(e)
            }, status=500)