Update src/streamlit_app.py

src/streamlit_app.py

@@ -91,9 +91,14 @@ with tab1:
             "Choose an HTML file",
             type=['html', 'htm'],
             key="file_uploader",
-            help="Upload an HTML file (max 200MB)"
+            help="Upload an HTML file (max 200MB)",
+            accept_multiple_files=False
         )
         
+        # Display file info if uploaded
+        if uploaded_file is not None:
+            st.info(f"📁 File: {uploaded_file.name} ({uploaded_file.size} bytes)")
+        
         aspect_ratio_file = st.radio(
             "Aspect Ratio",
             options=["16:9", "1:1", "9:16"],
@@ -102,41 +107,54 @@ with tab1:
             help="Select the page orientation and dimensions"
         )
         
-        convert_file_btn = st.button("🔄 Convert to PDF", key="convert_file", type="primary", use_container_width=True)
+        convert_file_btn = st.button("🔄 Convert to PDF", key="convert_file", type="primary", use_container_width=True, disabled=(uploaded_file is None))
     
     with col2:
-        if convert_file_btn:
-            if uploaded_file is not None:
-                try:
-                    with st.spinner("Converting HTML to PDF..."):
-                        # Read uploaded file with proper encoding handling
-                        try:
-                            html_content = uploaded_file.read().decode('utf-8')
-                        except UnicodeDecodeError:
-                            # Try with latin-1 encoding if utf-8 fails
-                            uploaded_file.seek(0)
-                            html_content = uploaded_file.read().decode('latin-1')
-                        
+        if convert_file_btn and uploaded_file is not None:
+            try:
+                with st.spinner("Converting HTML to PDF..."):
+                    # Reset file pointer to beginning
+                    uploaded_file.seek(0)
+                    
+                    # Read uploaded file with proper encoding handling
+                    try:
+                        html_content = uploaded_file.getvalue().decode('utf-8')
+                    except UnicodeDecodeError:
+                        # Try with latin-1 encoding if utf-8 fails
+                        uploaded_file.seek(0)
+                        html_content = uploaded_file.getvalue().decode('latin-1')
+                    
+                    if not html_content or len(html_content.strip()) == 0:
+                        st.error("The uploaded file is empty.")
+                    else:
                         # Convert to PDF
                         pdf_bytes, error = convert_html_to_pdf(html_content, aspect_ratio_file)
                         
                         if error:
-                            st.error(error)
+                            st.error(f"❌ {error}")
+                            with st.expander("Show error details"):
+                                st.code(error)
                         else:
                             st.success("✅ PDF generated successfully!")
                             
                             # Download button with PDF bytes
+                            output_filename = uploaded_file.name.replace('.html', '.pdf').replace('.htm', '.pdf')
+                            if not output_filename.endswith('.pdf'):
+                                output_filename += '.pdf'
+                            
                             st.download_button(
                                 label="⬇️ Download PDF",
                                 data=pdf_bytes,
-                                file_name=f"{uploaded_file.name.replace('.html', '.pdf').replace('.htm', '.pdf')}",
+                                file_name=output_filename,
                                 mime="application/pdf",
-                                use_container_width=True
+                                use_container_width=True,
+                                key="download_file_pdf"
                             )
-                except Exception as e:
-                    st.error(f"Error processing file: {str(e)}")
-            else:
-                st.warning("Please upload an HTML file first.")
+            except Exception as e:
+                st.error(f"❌ Error processing file: {str(e)}")
+                with st.expander("Show full error"):
+                    import traceback
+                    st.code(traceback.format_exc())
 
 # Tab 2: Paste HTML Code
 with tab2: