From bfc20cf91d2192c4341c1679b0054a410231a406 Mon Sep 17 00:00:00 2001
From: Avinash Kumar Deepak <avinash8655279@gmail.com>
Date: Fri, 20 Mar 2026 21:04:47 +0530
Subject: [PATCH] fix: fail gracefully for unsupported file system APIs

---
 src/component/fileBrowser.jsx          | 50 +++++++++++++++-----------
 src/component/modals/FileEdit.jsx      | 11 ++++--
 src/toolbarActions/toolbarFunctions.js | 14 +++++---
 3 files changed, 47 insertions(+), 28 deletions(-)

diff --git a/src/component/fileBrowser.jsx b/src/component/fileBrowser.jsx
index 5b80004..e0d57c6 100644
--- a/src/component/fileBrowser.jsx
+++ b/src/component/fileBrowser.jsx
@@ -94,28 +94,34 @@ const LocalFileBrowser = ({ superState, dispatcher }) => {
     };
 
     const newFeature = async () => {
-        const dirHandle = await window.showDirectoryPicker();
-        let state = [];
-        // eslint-disable-next-line no-restricted-syntax
-        for await (const [key, value] of dirHandle.entries()) {
-            if (value.kind === 'file') {
-                const fileData = await value.getFile();
-                state = state.concat([{
-                    key: `${dirHandle.name}/${key}`,
-                    modified: fileData.lastModified,
-                    size: fileData.size,
-                    fileObj: fileData,
-                    fileHandle: value,
-                }]);
-            } else if (value.kind === 'directory') {
-                const res = await handleFileInDirs(dirHandle.name, value);
-                state = state.concat(res);
+        try {
+            const dirHandle = await window.showDirectoryPicker();
+            let state = [];
+            // eslint-disable-next-line no-restricted-syntax
+            for await (const [key, value] of dirHandle.entries()) {
+                if (value.kind === 'file') {
+                    const fileData = await value.getFile();
+                    state = state.concat([{
+                        key: `${dirHandle.name}/${key}`,
+                        modified: fileData.lastModified,
+                        size: fileData.size,
+                        fileObj: fileData,
+                        fileHandle: value,
+                    }]);
+                } else if (value.kind === 'directory') {
+                    const res = await handleFileInDirs(dirHandle.name, value);
+                    state = state.concat(res);
+                }
+            }
+            setFileState([]);
+            setFileState(state);
+            dispatcher({ type: T.SET_DIR_NAME, payload: state[0].key.split('/')[0] });
+            dispatcher({ type: T.SET_FILE_STATE, payload: state });
+        } catch (error) {
+            if (error.name !== 'AbortError') {
+                toast.info('Switch to Edge/Chrome!');
             }
         }
-        setFileState([]);
-        setFileState(state);
-        dispatcher({ type: T.SET_DIR_NAME, payload: state[0].key.split('/')[0] });
-        dispatcher({ type: T.SET_FILE_STATE, payload: state });
     };
 
     const newFeatureFile = async () => {
@@ -161,6 +167,10 @@ const LocalFileBrowser = ({ superState, dispatcher }) => {
                         onChange={(e) => {
                             const { files } = e.target;
                             if (files && files.length > 0) {
+                                if (!files[0].webkitRelativePath) {
+                                    toast.info('Switch to Edge/Chrome!');
+                                    return;
+                                }
                                 tempFilesRef.current = files;
                                 const folderName = files[0].webkitRelativePath.split('/')[0];
                                 setPendingFolderName(folderName);
diff --git a/src/component/modals/FileEdit.jsx b/src/component/modals/FileEdit.jsx
index 4789297..5f4c22b 100644
--- a/src/component/modals/FileEdit.jsx
+++ b/src/component/modals/FileEdit.jsx
@@ -16,7 +16,7 @@ const FileEditModal = ({ superState, dispatcher }) => {
     const [showFilenameModal, setShowFilenameModal] = useState(false);
 
     useEffect(() => {
-        if (navigator.userAgent.indexOf('Edg') !== -1 || navigator.userAgent.indexOf('Chrome') !== -1) {
+        if ('showSaveFilePicker' in window) {
             setDirButton(true);
         }
     }, []);
@@ -28,11 +28,16 @@ const FileEditModal = ({ superState, dispatcher }) => {
     };
 
     async function submit() {
-        if (superState.fileHandle) {
+        if (!superState.fileHandle || !superState.fileHandle.createWritable) {
+            toast.warn('Switch to Edge/Chrome!');
+            dispatcher({ type: T.EDIT_TEXTFILE, payload: { show: false } });
+            return;
+        }
+        try {
             const stream = await superState.fileHandle.createWritable();
             await stream.write(codeStuff);
             await stream.close();
-        } else {
+        } catch (error) {
             toast.warn('Switch to Edge/Chrome!');
         }
         dispatcher({ type: T.EDIT_TEXTFILE, payload: { show: false } });
diff --git a/src/toolbarActions/toolbarFunctions.js b/src/toolbarActions/toolbarFunctions.js
index e83e481..721b106 100644
--- a/src/toolbarActions/toolbarFunctions.js
+++ b/src/toolbarActions/toolbarFunctions.js
@@ -85,11 +85,15 @@ const saveAction = (state) => {
 async function saveGraphMLFile(state) {
     if (state.curGraphInstance) {
         const graph = state.graphs[state.curGraphIndex];
-        if (graph.fileHandle) {
-            const stream = await graph.fileHandle.createWritable();
-            await stream.write(getGraphFun(state).saveToFolder());
-            await stream.close();
-            toast.success('File saved Successfully');
+        if (graph.fileHandle && graph.fileHandle.createWritable) {
+            try {
+                const stream = await graph.fileHandle.createWritable();
+                await stream.write(getGraphFun(state).saveToFolder());
+                await stream.close();
+                toast.success('File saved Successfully');
+            } catch (error) {
+                getGraphFun(state).saveWithoutFileHandle();
+            }
         } else if (!graph.fileHandle) {
             getGraphFun(state).saveWithoutFileHandle();
         } else {