"""
Integrations UI Views
"""
from rest_framework import viewsets, status
from rest_framework.decorators import action
from rest_framework.response import Response
from django.shortcuts import render, redirect
from django.contrib import messages
from django.utils.translation import gettext_lazy as _

from .models import SurveyTemplateMapping
from .serializers import SurveyTemplateMappingSerializer


class SurveyTemplateMappingViewSet(viewsets.ModelViewSet):
    """
    ViewSet for managing survey template mappings.
    
    Provides CRUD operations for mapping patient types to survey templates.
    """
    queryset = SurveyTemplateMapping.objects.select_related(
        'hospital', 'survey_template'
    ).all()
    serializer_class = SurveyTemplateMappingSerializer
    filterset_fields = ['hospital', 'patient_type', 'is_active']
    search_fields = ['hospital__name', 'patient_type', 'survey_template__name']
    ordering_fields = ['hospital', 'patient_type', 'is_active']
    ordering = ['hospital', 'patient_type', 'is_active']
    
    def get_queryset(self):
        """
        Filter mappings by user's accessible hospitals.
        """
        queryset = super().get_queryset()
        user = self.request.user
        
        # If user is not superuser, filter by their hospital
        if not user.is_superuser and user.hospital:
            queryset = queryset.filter(hospital=user.hospital)
        elif not user.is_superuser and not user.hospital:
            # User without hospital assignment - no access
            queryset = queryset.none()
        
        return queryset
    
    def perform_create(self, serializer):
        """Add created_by information"""
        serializer.save()
    
    @action(detail=False, methods=['get'])
    def by_hospital(self, request):
        """
        Get all mappings for a specific hospital.
        
        Query param: hospital_id
        """
        hospital_id = request.query_params.get('hospital_id')
        
        if not hospital_id:
            return Response(
                {'error': 'hospital_id parameter is required'},
                status=status.HTTP_400_BAD_REQUEST
            )
        
        mappings = self.get_queryset().filter(hospital_id=hospital_id)
        serializer = self.get_serializer(mappings, many=True)
        
        return Response(serializer.data)
    
    @action(detail=False, methods=['get'])
    def by_patient_type(self, request):
        """
        Get mapping for a specific patient type and hospital.
        
        Query params: hospital_id, patient_type_code
        """
        hospital_id = request.query_params.get('hospital_id')
        patient_type_code = request.query_params.get('patient_type_code')
        
        if not hospital_id or not patient_type_code:
            return Response(
                {'error': 'hospital_id and patient_type_code parameters are required'},
                status=status.HTTP_400_BAD_REQUEST
            )
        
        mapping = SurveyTemplateMapping.get_template_for_patient_type(
            patient_type_code, hospital_id
        )
        
        if not mapping:
            return Response(
                {'error': 'No mapping found'},
                status=status.HTTP_404_NOT_FOUND
            )
        
        serializer = self.get_serializer(mapping)
        return Response(serializer.data)
    
    @action(detail=False, methods=['post'])
    def bulk_create(self, request):
        """
        Create multiple mappings at once.
        
        Expects: {
            "mappings": [
                {
                    "hospital": 1,
                    "patient_type_code": "1",
                    "patient_type_name": "Inpatient",
                    "survey_template": 1,
                    "priority": 1
                },
                ...
            ]
        }
        """
        mappings_data = request.data.get('mappings', [])
        
        if not mappings_data:
            return Response(
                {'error': 'mappings array is required'},
                status=status.HTTP_400_BAD_REQUEST
            )
        
        created_mappings = []
        for mapping_data in mappings_data:
            serializer = self.get_serializer(data=mapping_data)
            if serializer.is_valid():
                serializer.save()
                created_mappings.append(serializer.data)
        
        return Response(
            {'created': len(created_mappings), 'mappings': created_mappings},
            status=status.HTTP_201_CREATED
        )


def survey_mapping_settings(request):
    """
    Survey mapping settings page.
    
    Allows administrators to configure which survey templates
    are sent for each patient type at each hospital.
    """
    from apps.organizations.models import Hospital
    
    user = request.user
    
    # Get user's accessible hospitals based on role
    if user.is_superuser:
        # Superusers can see all hospitals
        hospitals = Hospital.objects.all()
    elif user.hospital:
        # Regular users can only see their assigned hospital
        hospitals = Hospital.objects.filter(id=user.hospital.id)
    else:
        # User without hospital assignment - no access
        hospitals = []
    
    # Get all mappings
    if user.is_superuser:
        mappings = SurveyTemplateMapping.objects.select_related(
            'hospital', 'survey_template'
        ).all()
    else:
        mappings = SurveyTemplateMapping.objects.filter(
            hospital__in=hospitals
        ).select_related('hospital', 'survey_template')
    
    # Group mappings by hospital
    mappings_by_hospital = {}
    for mapping in mappings:
        hospital_name = mapping.hospital.name
        if hospital_name not in mappings_by_hospital:
            mappings_by_hospital[hospital_name] = []
        mappings_by_hospital[hospital_name].append(mapping)
    
    context = {
        'hospitals': hospitals,
        'mappings': mappings,
        'mappings_by_hospital': mappings_by_hospital,
        'page_title': _('Survey Template Mappings'),
    }
    
    return render(request, 'integrations/survey_mapping_settings.html', context)