Fixing export file path in schema designer (#19476)

* Enhance export functionality by using a unique file path based on the current workspace folder

* clean up code

Author: aasimkhan30

src/schemaDesigner/schemaDesignerWebviewController.ts

@@ -10,6 +10,8 @@ import VscodeWrapper from "../controllers/vscodeWrapper";
 import * as LocConstants from "../constants/locConstants";
 import { TreeNodeInfo } from "../objectExplorer/nodes/treeNodeInfo";
 import MainController from "../controllers/mainController";
+import { homedir } from "os";
+import { getUniqueFilePath } from "../utils/utils";
 
 export class SchemaDesignerWebviewController extends ReactWebviewPanelController<
     SchemaDesigner.SchemaDesignerWebviewState,
@@ -62,11 +64,18 @@ export class SchemaDesignerWebviewController extends ReactWebviewPanelController
 
     private registerReducers() {
         this.registerRequestHandler("exportToFile", async (payload) => {
+            // Determine the base folder for saving the file
+            const baseFolder =
+                vscode.workspace.workspaceFolders?.[0]?.uri ?? vscode.Uri.file(homedir());
+
+            // Prompt the user with a Save dialog
             const outputPath = await vscode.window.showSaveDialog({
-                filters: {
-                    [payload.format]: [payload.format],
-                },
-                defaultUri: vscode.Uri.file(`${this.databaseName}.${payload.format}`),
+                filters: { [payload.format]: [payload.format] },
+                defaultUri: await getUniqueFilePath(
+                    baseFolder,
+                    `schema-${this.databaseName}`,
+                    payload.format,
+                ),
                 saveLabel: LocConstants.SchemaDesigner.Save,
                 title: LocConstants.SchemaDesigner.SaveAs,
             });