Update app.py

app.py

@@ -14,13 +14,16 @@ logger = logging.getLogger(__name__)
 
 def process_files(*uploaded_files):
     """Process uploaded CSV files and generate dashboard outputs."""
-    logger.info(f"Received {len(uploaded_files)} uploaded files.")
-    if not uploaded_files:
-        return "Please upload at least one CSV file.", None, None, None, None
+    logger.info(f"Received {len(uploaded_files)} uploaded files: {uploaded_files}")
+    # Filter out None values and ensure we have valid files
+    valid_files = [f for f in uploaded_files if f is not None]
+    if not valid_files:
+        logger.warning("No valid files uploaded.")
+        return "Please upload at least one valid CSV file.", None, None, None, None
 
     try:
         # Load data
-        df = load_logs(uploaded_files)
+        df = load_logs(valid_files)
         logger.info(f"Loaded {len(df)} log records from uploaded files.")
 
         # Log table
@@ -48,16 +51,17 @@ def process_files(*uploaded_files):
         return f"Error: {e}", None, None, None, None
 
 def generate_pdf_report(df):
-    """Generate and return path to PDF report."""
+    """Generate and return path to PDF report, with error message if applicable."""
     if df is None:
-        return "Please upload CSV files first."
+        logger.warning("No data available for PDF generation.")
+        return None, "Please upload CSV files first."
     logger.info("Generating PDF report...")
     try:
         pdf_path = generate_pdf(df)
-        return pdf_path
+        return pdf_path, "PDF generated successfully."
     except Exception as e:
         logger.error(f"Failed to generate PDF: {e}")
-        return f"Error generating PDF: {e}"
+        return None, f"Error generating PDF: {e}"
 
 with gr.Blocks(title="Multi-Device LabOps Dashboard") as demo:
     gr.Markdown("# 📊 Multi-Device LabOps Dashboard")
@@ -87,6 +91,7 @@ with gr.Blocks(title="Multi-Device LabOps Dashboard") as demo:
     with gr.Row():
         pdf_btn = gr.Button("📄 Generate PDF Report")
         pdf_output = gr.File(label="Download PDF Report")
+        pdf_message = gr.Textbox(label="PDF Generation Status")
     
     # State to store dataframe
     df_state = gr.State()
@@ -101,7 +106,7 @@ with gr.Blocks(title="Multi-Device LabOps Dashboard") as demo:
     pdf_btn.click(
         fn=generate_pdf_report,
         inputs=[df_state],
-        outputs=[pdf_output]
+        outputs=[pdf_output, pdf_message]
     )
 
 if __name__ == "__main__":