From e129b3c9f4cdcfe79aa562b9e1c73e035ef78021 Mon Sep 17 00:00:00 2001
From: anovazzi1 <otavio2204@gmail.com>
Date: Fri, 8 Sep 2023 12:13:40 -0300
Subject: [PATCH] refactor(reactflowUtils.ts): extract validation logic into a
 separate function for better code organization and reusability
 feat(reactflowUtils.ts): add validateSelection function to validate the
 selection of nodes and edges in the React Flow instance

---
 src/frontend/src/utils/reactflowUtils.ts | 31 ++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/src/frontend/src/utils/reactflowUtils.ts b/src/frontend/src/utils/reactflowUtils.ts
index 424791fd3..5c1386b47 100644
--- a/src/frontend/src/utils/reactflowUtils.ts
+++ b/src/frontend/src/utils/reactflowUtils.ts
@@ -487,6 +487,37 @@ export function concatFlows(
   ReactFlowInstance.addEdges(edges);
 }
 
+export function validateSelection(
+  selection: OnSelectionChangeParams
+): Array<string> {
+  let errorsArray: Array<string> = [];
+  // check if there is more than one node
+  if (selection.nodes.length < 2) {
+    errorsArray.push("Please select more than one node");
+  }
+
+  //check if there are two or more nodes with free outputs
+  if (
+    selection.nodes.filter(
+      (n) => !selection.edges.some((e) => e.source === n.id)
+    ).length > 1
+  ) {
+    errorsArray.push("Please select only one node with free outputs");
+  }
+
+  // check if there is any node that does not have any connection
+  if (
+    selection.nodes.some(
+      (node) =>
+        !selection.edges.some((edge) => edge.target === node.id) &&
+        !selection.edges.some((edge) => edge.source === node.id)
+    )
+  ) {
+    errorsArray.push("Please select only nodes that are connected");
+  }
+  return errorsArray;
+}
+
 export function generateNodeFromFlow(flow: FlowType): NodeType {
   const { nodes } = flow.data!;
   const outputNode = _.cloneDeep(findLastNode(flow.data!));