Update tools/file_loader.py

tools/file_loader.py

@@ -1,4 +1,5 @@
 import io
+import os
 import pandas as pd
 from PyPDF2 import PdfReader
 
@@ -34,4 +35,27 @@ def read_txt(file_bytes: bytes) -> str:
     except UnicodeDecodeError:
         return file_bytes.decode('latin1', errors='ignore').strip()
     except Exception as e:
-        return f"[ERROR] Failed to read TXT: {e}"
+        return f"[ERROR] Failed to read TXT: {e}"
+
+def load_file_if_any(file_path: str) -> str:
+    """
+    Loads and reads file content based on file extension.
+    Supports .pdf, .csv, .txt files. Returns "" if no file.
+    """
+    if not file_path or not os.path.exists(file_path):
+        return ""
+    
+    try:
+        with open(file_path, "rb") as f:
+            file_bytes = f.read()
+        
+        if file_path.endswith(".pdf"):
+            return read_pdf(file_bytes)
+        elif file_path.endswith(".csv"):
+            return read_csv(file_bytes)
+        elif file_path.endswith(".txt"):
+            return read_txt(file_bytes)
+        else:
+            return "[WARNING] Unsupported file format."
+    except Exception as e:
+        return f"[ERROR] Failed to load file: {e}"