Add autocompletion for wiki links

app/src/utils/fileHelpers.ts

@@ -1,5 +1,17 @@
 import { API_BASE_URL } from '@/types/api';
-import { IMAGE_EXTENSIONS } from '@/types/models';
+import { IMAGE_EXTENSIONS, type FileNode } from '@/types/models';
+
+/**
+ * Represents a flattened file for searching and autocompletion
+ */
+export interface FlatFile {
+  name: string; // "meeting-notes.md"
+  path: string; // "work/2024/meeting-notes.md"
+  displayPath: string; // "work/2024/meeting-notes"
+  nameWithoutExt: string; // "meeting-notes"
+  parentFolder: string; // "work/2024"
+  isImage: boolean;
+}
 
 /**
  * Checks if the given file path has an image extension.
@@ -15,3 +27,65 @@ export const getFileUrl = (workspaceName: string, filePath: string) => {
     workspaceName
   )}/files/content?file_path=${encodeURIComponent(filePath)}`;
 };
+
+/**
+ * Recursively flattens FileNode tree into searchable array
+ * Precomputes display strings and metadata for performance
+ *
+ * @param nodes - Array of FileNode from the file tree
+ * @param showHiddenFiles - Whether to include hidden files (files/folders starting with .)
+ * @returns Array of FlatFile objects ready for searching
+ */
+export function flattenFileTree(nodes: FileNode[], showHiddenFiles = false): FlatFile[] {
+  const result: FlatFile[] = [];
+
+  function traverse(node: FileNode) {
+    // Skip hidden files and folders if showHiddenFiles is false
+    // Hidden files/folders are those that start with a dot (.)
+    if (!showHiddenFiles && node.name.startsWith('.')) {
+      return;
+    }
+
+    // Only process files, not folders (folders have children)
+    if (!node.children) {
+      const name = node.name;
+      const path = node.path;
+      const isImage = isImageFile(path);
+
+      // Remove extension for display (except for images)
+      let nameWithoutExt = name;
+      let displayPath = path;
+
+      if (name.endsWith('.md')) {
+        nameWithoutExt = name.slice(0, -3);
+        displayPath = path.slice(0, -3);
+      }
+
+      // Get parent folder path
+      const lastSlashIndex = path.lastIndexOf('/');
+      const parentFolder = lastSlashIndex > 0 ? path.slice(0, lastSlashIndex) : '';
+
+      result.push({
+        name,
+        path,
+        displayPath,
+        nameWithoutExt,
+        parentFolder,
+        isImage,
+      });
+    }
+
+    // Recursively process children
+    if (node.children) {
+      for (const child of node.children) {
+        traverse(child);
+      }
+    }
+  }
+
+  for (const node of nodes) {
+    traverse(node);
+  }
+
+  return result;
+}