From a47d93a59bae1ef70bdc3217f6393e79ba3d779a Mon Sep 17 00:00:00 2001
From: IRBorisov <8611739+IRBorisov@users.noreply.github.com>
Date: Fri, 22 Mar 2024 20:14:32 +0300
Subject: [PATCH] Implement InlineSynthesis backend

---
 rsconcept/backend/apps/rsform/messages.py     |  6 +++
 .../apps/rsform/serializers/data_access.py    | 37 +++++++++++++++++++
 .../backend/apps/rsform/views/operations.py   | 27 ++++++++++----
 3 files changed, 63 insertions(+), 7 deletions(-)

diff --git a/rsconcept/backend/apps/rsform/messages.py b/rsconcept/backend/apps/rsform/messages.py
index 7c293f14..ba1f9cbb 100644
--- a/rsconcept/backend/apps/rsform/messages.py
+++ b/rsconcept/backend/apps/rsform/messages.py
@@ -4,6 +4,12 @@
 def constituentaNotOwned(title: str):
     return f'Конституента не принадлежит схеме: {title}'
 
+def substitutionNotInList():
+    return 'Отождествляемая конституента отсутствует в списке'
+
+def schemaNotOwned():
+    return 'Нет доступа к схеме'
+
 def renameTrivial(name: str):
     return f'Имя должно отличаться от текущего: {name}'
 
diff --git a/rsconcept/backend/apps/rsform/serializers/data_access.py b/rsconcept/backend/apps/rsform/serializers/data_access.py
index a56acfbc..346cedf0 100644
--- a/rsconcept/backend/apps/rsform/serializers/data_access.py
+++ b/rsconcept/backend/apps/rsform/serializers/data_access.py
@@ -1,5 +1,7 @@
 ''' Serializers for persistent data manipulation. '''
 from typing import Optional, cast
+from django.contrib.auth.models import User
+from django.core.exceptions import PermissionDenied
 from rest_framework import serializers
 from rest_framework.serializers import PrimaryKeyRelatedField as PKField
 
@@ -297,4 +299,39 @@ class InlineSynthesisSerializer(serializers.Serializer):
     )
 
     def validate(self, attrs):
+        user = cast(User, self.context['user'])
+        schema_in = cast(LibraryItem, attrs['source'])
+        schema_out = cast(LibraryItem, attrs['receiver'])
+        if user.is_anonymous or (schema_out.owner != user and not user.is_staff):
+            raise PermissionDenied({
+                'message': msg.schemaNotOwned(),
+                'object_id': schema_in.id
+            })
+        constituents = cast(list[Constituenta], attrs['items'])
+        for cst in constituents:
+            if cst.schema != schema_in:
+                raise serializers.ValidationError({
+                    f'{cst.id}': msg.constituentaNotOwned(schema_in.title)
+                })
+        for item in attrs['substitutions']:
+            original_cst = cast(Constituenta, item['original'])
+            substitution_cst = cast(Constituenta, item['substitution'])
+            if original_cst.schema == schema_in:
+                if original_cst not in constituents:
+                    raise serializers.ValidationError({
+                        f'{original_cst.id}': msg.substitutionNotInList()
+                    })
+                if substitution_cst.schema != schema_out:
+                    raise serializers.ValidationError({
+                        f'{substitution_cst.id}': msg.constituentaNotOwned(schema_out.title)
+                    })
+            else:
+                if substitution_cst not in constituents:
+                    raise serializers.ValidationError({
+                        f'{substitution_cst.id}': msg.substitutionNotInList()
+                    })
+                if original_cst.schema != schema_out:
+                    raise serializers.ValidationError({
+                        f'{original_cst.id}': msg.constituentaNotOwned(schema_out.title)
+                    })
         return attrs
diff --git a/rsconcept/backend/apps/rsform/views/operations.py b/rsconcept/backend/apps/rsform/views/operations.py
index 2fa38bdc..34ae2542 100644
--- a/rsconcept/backend/apps/rsform/views/operations.py
+++ b/rsconcept/backend/apps/rsform/views/operations.py
@@ -1,4 +1,6 @@
 ''' Endpoints for RSForm. '''
+from typing import cast
+from django.db import transaction
 from rest_framework.decorators import api_view
 from rest_framework.response import Response
 from rest_framework.request import Request
@@ -14,19 +16,30 @@ from .. import serializers as s
     request=s.InlineSynthesisSerializer,
     responses={c.HTTP_200_OK: s.RSFormParseSerializer}
 )
+@transaction.atomic
 @api_view(['PATCH'])
 def inline_synthesis(request: Request):
     ''' Endpoint: Inline synthesis. '''
-    serializer = s.InlineSynthesisSerializer(data=request.data)
+    serializer = s.InlineSynthesisSerializer(
+        data=request.data,
+        context={'user': request.user}
+    )
     serializer.is_valid(raise_exception=True)
 
     schema = m.RSForm(serializer.validated_data['receiver'])
-    # schema.substitute(
-    #     original=serializer.validated_data['original'],
-    #     substitution=serializer.validated_data['substitution'],
-    #     transfer_term=serializer.validated_data['transfer_term']
-    # )
-    schema.item.refresh_from_db()
+    items = cast(list[m.Constituenta], serializer.validated_data['items'])
+    new_items = schema.insert_copy(items)
+
+    for substitution in serializer.validated_data['substitutions']:
+        original = cast(m.Constituenta, substitution['original'])
+        replacement = cast(m.Constituenta, substitution['substitution'])
+        if original in items:
+            index = next(i for (i, cst) in enumerate(items) if cst == original)
+            original = new_items[index]
+        else:
+            index = next(i for (i, cst) in enumerate(items) if cst == replacement)
+            replacement = new_items[index]
+        schema.substitute(original, replacement, serializer.validated_data['transfer_term'])
     return Response(
         status=c.HTTP_200_OK,
         data=s.RSFormParseSerializer(schema.item).data