From 568d8577b95cb58964e5a46f27b1bb864c483455 Mon Sep 17 00:00:00 2001
From: Nikita Chistousov <nikita_chistousov@epam.com>
Date: Thu, 8 Aug 2024 15:39:13 +0200
Subject: [PATCH] =?UTF-8?q?Backmerge:=20#5184=20=E2=80=93=20Fix=20unresolv?=
 =?UTF-8?q?ed=20monomers=20bond=20establishing=20issue?=
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---
 .../ketcher-core/src/application/editor/tools/Bond.ts    | 9 +++++++++
 .../src/domain/entities/UnresolvedMonomer.ts             | 9 +++++----
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/packages/ketcher-core/src/application/editor/tools/Bond.ts b/packages/ketcher-core/src/application/editor/tools/Bond.ts
index 93a7982115..2f95eff83d 100644
--- a/packages/ketcher-core/src/application/editor/tools/Bond.ts
+++ b/packages/ketcher-core/src/application/editor/tools/Bond.ts
@@ -28,6 +28,7 @@ import { Coordinates } from '../shared/coordinates';
 import { AttachmentPointName } from 'domain/types';
 import { AttachmentPoint } from 'domain/AttachmentPoint';
 import { Command } from 'domain/entities/Command';
+import { UnresolvedMonomer } from "domain/entities";
 
 class PolymerBond implements BaseTool {
   private bondRenderer?: PolymerBondRenderer;
@@ -493,6 +494,14 @@ class PolymerBond implements BaseTool {
       return true;
     }
 
+    // Modal: Any or both monomers are unresolved
+    if (
+      firstMonomer instanceof UnresolvedMonomer ||
+      secondMonomer instanceof UnresolvedMonomer
+    ) {
+      return true;
+    }
+
     // Modal: One monomer is Peptide and another is RNA monomer
     const rnaMonomerClasses = [Sugar, RNABase, Phosphate];
     const firstMonomerIsRNA = rnaMonomerClasses.find(
diff --git a/packages/ketcher-core/src/domain/entities/UnresolvedMonomer.ts b/packages/ketcher-core/src/domain/entities/UnresolvedMonomer.ts
index b6b6611f11..c3314fc02f 100644
--- a/packages/ketcher-core/src/domain/entities/UnresolvedMonomer.ts
+++ b/packages/ketcher-core/src/domain/entities/UnresolvedMonomer.ts
@@ -2,14 +2,15 @@ import { BaseMonomer } from './BaseMonomer';
 import { ChemSubChain } from 'domain/entities/monomer-chains/ChemSubChain';
 import { PeptideSubChain } from 'domain/entities/monomer-chains/PeptideSubChain';
 import { SubChainNode } from 'domain/entities/monomer-chains/types';
+import { Peptide } from 'domain/entities/Peptide';
 
 export class UnresolvedMonomer extends BaseMonomer {
-  public getValidSourcePoint(_monomer?: BaseMonomer) {
-    return undefined;
+  public getValidSourcePoint(monomer?: BaseMonomer) {
+    return Peptide.prototype.getValidSourcePoint.call(this, monomer);
   }
 
-  public getValidTargetPoint(_monomer: BaseMonomer) {
-    return undefined;
+  public getValidTargetPoint(monomer: BaseMonomer) {
+    return Peptide.prototype.getValidTargetPoint.call(this, monomer);
   }
 
   public get SubChainConstructor() {