Portal/rsconcept/backend/apps/oss/views/oss.py

''' Endpoints for OSS. '''
from typing import cast

from django.db import transaction
from django.http import HttpResponse
from drf_spectacular.utils import extend_schema, extend_schema_view
from rest_framework import generics, serializers
from rest_framework import status as c
from rest_framework import viewsets
from rest_framework.decorators import action
from rest_framework.request import Request
from rest_framework.response import Response

from apps.library.models import LibraryItem, LibraryItemType
from apps.library.serializers import LibraryItemSerializer
from apps.rsform.models import Constituenta
from apps.rsform.serializers import CstTargetSerializer
from shared import messages as msg
from shared import permissions

from .. import models as m
from .. import serializers as s


@extend_schema(tags=['OSS'])
@extend_schema_view()
class OssViewSet(viewsets.GenericViewSet, generics.ListAPIView, generics.RetrieveAPIView):
    ''' Endpoint: OperationSchema. '''
    queryset = LibraryItem.objects.filter(item_type=LibraryItemType.OPERATION_SCHEMA)
    serializer_class = LibraryItemSerializer

    def _get_item(self) -> LibraryItem:
        return cast(LibraryItem, self.get_object())

    def get_permissions(self):
        ''' Determine permission class. '''
        if self.action in [
            'create_operation',
            'delete_operation',
            'update_positions',
            'create_input',
            'set_input',
            'update_operation',
            'execute_operation'
        ]:
            permission_list = [permissions.ItemEditor]
        elif self.action in ['details']:
            permission_list = [permissions.ItemAnyone]
        elif self.action in ['get_predecessor']:
            permission_list = [permissions.Anyone]
        else:
            permission_list = [permissions.Anyone]
        return [permission() for permission in permission_list]

    @extend_schema(
        summary='get operations data',
        tags=['OSS'],
        request=None,
        responses={
            c.HTTP_200_OK: s.OperationSchemaSerializer,
            c.HTTP_404_NOT_FOUND: None
        }
    )
    @action(detail=True, methods=['get'], url_path='details')
    def details(self, request: Request, pk) -> HttpResponse:
        ''' Endpoint: Detailed OSS data. '''
        serializer = s.OperationSchemaSerializer(self._get_item())
        return Response(
            status=c.HTTP_200_OK,
            data=serializer.data
        )

    @extend_schema(
        summary='update positions',
        tags=['OSS'],
        request=s.PositionsSerializer,
        responses={
            c.HTTP_200_OK: None,
            c.HTTP_403_FORBIDDEN: None,
            c.HTTP_404_NOT_FOUND: None
        }
    )
    @action(detail=True, methods=['patch'], url_path='update-positions')
    def update_positions(self, request: Request, pk) -> HttpResponse:
        ''' Endpoint: Update operations positions. '''
        serializer = s.PositionsSerializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        m.OperationSchema(self.get_object()).update_positions(serializer.validated_data['positions'])
        return Response(status=c.HTTP_200_OK)

    @extend_schema(
        summary='create operation',
        tags=['OSS'],
        request=s.OperationCreateSerializer(),
        responses={
            c.HTTP_201_CREATED: s.NewOperationResponse,
            c.HTTP_400_BAD_REQUEST: None,
            c.HTTP_403_FORBIDDEN: None,
            c.HTTP_404_NOT_FOUND: None
        }
    )
    @action(detail=True, methods=['post'], url_path='create-operation')
    def create_operation(self, request: Request, pk) -> HttpResponse:
        ''' Create new operation. '''
        serializer = s.OperationCreateSerializer(data=request.data)
        serializer.is_valid(raise_exception=True)

        oss = m.OperationSchema(self.get_object())
        with transaction.atomic():
            oss.update_positions(serializer.validated_data['positions'])
            new_operation = oss.create_operation(**serializer.validated_data['item_data'])
            if new_operation.operation_type == m.OperationType.INPUT and serializer.validated_data['create_schema']:
                oss.create_input(new_operation)
            if new_operation.operation_type != m.OperationType.INPUT and 'arguments' in serializer.validated_data:
                oss.set_arguments(
                    operation=new_operation,
                    arguments=serializer.validated_data['arguments']
                )
        return Response(
            status=c.HTTP_201_CREATED,
            data={
                'new_operation': s.OperationSerializer(new_operation).data,
                'oss': s.OperationSchemaSerializer(oss.model).data
            }
        )

    @extend_schema(
        summary='delete operation',
        tags=['OSS'],
        request=s.OperationTargetSerializer,
        responses={
            c.HTTP_200_OK: s.OperationSchemaSerializer,
            c.HTTP_400_BAD_REQUEST: None,
            c.HTTP_403_FORBIDDEN: None,
            c.HTTP_404_NOT_FOUND: None
        }
    )
    @action(detail=True, methods=['patch'], url_path='delete-operation')
    def delete_operation(self, request: Request, pk) -> HttpResponse:
        ''' Endpoint: Delete operation. '''
        serializer = s.OperationTargetSerializer(
            data=request.data,
            context={'oss': self.get_object()}
        )
        serializer.is_valid(raise_exception=True)

        oss = m.OperationSchema(self.get_object())
        with transaction.atomic():
            oss.update_positions(serializer.validated_data['positions'])
            oss.delete_operation(serializer.validated_data['target'])

        return Response(
            status=c.HTTP_200_OK,
            data=s.OperationSchemaSerializer(oss.model).data
        )

    @extend_schema(
        summary='create input schema for target operation',
        tags=['OSS'],
        request=s.OperationTargetSerializer(),
        responses={
            c.HTTP_200_OK: s.NewSchemaResponse,
            c.HTTP_400_BAD_REQUEST: None,
            c.HTTP_403_FORBIDDEN: None,
            c.HTTP_404_NOT_FOUND: None
        }
    )
    @action(detail=True, methods=['patch'], url_path='create-input')
    def create_input(self, request: Request, pk) -> HttpResponse:
        ''' Create new input RSForm. '''
        serializer = s.OperationTargetSerializer(
            data=request.data,
            context={'oss': self.get_object()}
        )
        serializer.is_valid(raise_exception=True)

        operation: m.Operation = cast(m.Operation, serializer.validated_data['target'])
        if operation.operation_type != m.OperationType.INPUT:
            raise serializers.ValidationError({
                'target': msg.operationNotInput(operation.alias)
            })
        if operation.result is not None:
            raise serializers.ValidationError({
                'target': msg.operationResultNotEmpty(operation.alias)
            })

        oss = m.OperationSchema(self.get_object())
        with transaction.atomic():
            oss.update_positions(serializer.validated_data['positions'])
            schema = oss.create_input(operation)

        return Response(
            status=c.HTTP_200_OK,
            data={
                'new_schema': LibraryItemSerializer(schema.model).data,
                'oss': s.OperationSchemaSerializer(oss.model).data
            }
        )

    @extend_schema(
        summary='set input schema for target operation',
        tags=['OSS'],
        request=s.SetOperationInputSerializer(),
        responses={
            c.HTTP_200_OK: s.OperationSchemaSerializer,
            c.HTTP_400_BAD_REQUEST: None,
            c.HTTP_403_FORBIDDEN: None,
            c.HTTP_404_NOT_FOUND: None
        }
    )
    @action(detail=True, methods=['patch'], url_path='set-input')
    def set_input(self, request: Request, pk) -> HttpResponse:
        ''' Set input schema for target operation. '''
        serializer = s.SetOperationInputSerializer(
            data=request.data,
            context={'oss': self.get_object()}
        )
        serializer.is_valid(raise_exception=True)

        operation: m.Operation = cast(m.Operation, serializer.validated_data['target'])
        oss = m.OperationSchema(self.get_object())
        with transaction.atomic():
            oss.update_positions(serializer.validated_data['positions'])
            oss.set_input(operation, serializer.validated_data['input'])
        return Response(
            status=c.HTTP_200_OK,
            data=s.OperationSchemaSerializer(oss.model).data
        )

    @extend_schema(
        summary='update operation',
        tags=['OSS'],
        request=s.OperationUpdateSerializer(),
        responses={
            c.HTTP_200_OK: s.OperationSchemaSerializer,
            c.HTTP_400_BAD_REQUEST: None,
            c.HTTP_403_FORBIDDEN: None,
            c.HTTP_404_NOT_FOUND: None
        }
    )
    @action(detail=True, methods=['patch'], url_path='update-operation')
    def update_operation(self, request: Request, pk) -> HttpResponse:
        ''' Update operation arguments and parameters. '''
        serializer = s.OperationUpdateSerializer(
            data=request.data,
            context={'oss': self.get_object()}
        )
        serializer.is_valid(raise_exception=True)

        operation: m.Operation = cast(m.Operation, serializer.validated_data['target'])
        oss = m.OperationSchema(self.get_object())
        with transaction.atomic():
            oss.update_positions(serializer.validated_data['positions'])
            operation.alias = serializer.validated_data['item_data']['alias']
            operation.title = serializer.validated_data['item_data']['title']
            operation.comment = serializer.validated_data['item_data']['comment']
            operation.save()

            if operation.result is not None:
                can_edit = permissions.can_edit_item(request.user, operation.result)
                if can_edit or operation.operation_type == m.OperationType.SYNTHESIS:
                    operation.result.alias = operation.alias
                    operation.result.title = operation.title
                    operation.result.comment = operation.comment
                    operation.result.save()
            if 'arguments' in serializer.validated_data:
                oss.set_arguments(operation, serializer.validated_data['arguments'])
            if 'substitutions' in serializer.validated_data:
                oss.set_substitutions(operation, serializer.validated_data['substitutions'])
        return Response(
            status=c.HTTP_200_OK,
            data=s.OperationSchemaSerializer(oss.model).data
        )

    @extend_schema(
        summary='execute operation',
        tags=['OSS'],
        request=s.OperationTargetSerializer(),
        responses={
            c.HTTP_200_OK: s.OperationSchemaSerializer,
            c.HTTP_400_BAD_REQUEST: None,
            c.HTTP_403_FORBIDDEN: None,
            c.HTTP_404_NOT_FOUND: None
        }
    )
    @action(detail=True, methods=['post'], url_path='execute-operation')
    def execute_operation(self, request: Request, pk) -> HttpResponse:
        ''' Execute operation. '''
        serializer = s.OperationTargetSerializer(
            data=request.data,
            context={'oss': self.get_object()}
        )
        serializer.is_valid(raise_exception=True)

        operation: m.Operation = cast(m.Operation, serializer.validated_data['target'])
        if operation.operation_type != m.OperationType.SYNTHESIS:
            raise serializers.ValidationError({
                'target': msg.operationNotSynthesis(operation.alias)
            })
        if operation.result is not None:
            raise serializers.ValidationError({
                'target': msg.operationResultNotEmpty(operation.alias)
            })

        oss = m.OperationSchema(self.get_object())
        with transaction.atomic():
            oss.update_positions(serializer.validated_data['positions'])
            oss.execute_operation(operation)

        return Response(
            status=c.HTTP_200_OK,
            data=s.OperationSchemaSerializer(oss.model).data
        )

    @extend_schema(
        summary='get predecessor for target constituenta',
        tags=['OSS'],
        request=CstTargetSerializer(),
        responses={
            c.HTTP_200_OK: s.ConstituentaReferenceResponse,
            c.HTTP_400_BAD_REQUEST: None,
            c.HTTP_403_FORBIDDEN: None,
            c.HTTP_404_NOT_FOUND: None
        }
    )
    @action(detail=False, methods=['post'], url_path='get-predecessor')
    def get_predecessor(self, request: Request) -> HttpResponse:
        ''' Get predecessor. '''
        # TODO: add tests for this method
        serializer = CstTargetSerializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        cst = cast(Constituenta, serializer.validated_data['target'])
        inheritance = m.Inheritance.objects.filter(child=cst)
        while inheritance.exists():
            cst = cast(m.Inheritance, inheritance.first()).parent
            inheritance = m.Inheritance.objects.filter(child=cst)

        return Response(
            status=c.HTTP_200_OK,
            data={
                'id': cst.pk,
                'schema': cst.schema_id
            }
        )