Update app.py

app.py

@@ -11,6 +11,8 @@ import re
 import json
 import csv
 import io
+import tempfile
+import os
 from datetime import datetime
 
 # Configuration
@@ -259,28 +261,35 @@ def process_uploaded_file(file):
     return content
 
 def export_history_csv():
-    """Export history to CSV"""
+    """Export history to CSV file"""
     if not history:
-        return None
+        return None, "No history to export"
     
-    output = io.StringIO()
-    writer = csv.writer(output)
+    # Create temporary file
+    temp_file = tempfile.NamedTemporaryFile(mode='w', delete=False, suffix='.csv', encoding='utf-8')
+    writer = csv.writer(temp_file)
     writer.writerow(['Timestamp', 'Text', 'Sentiment', 'Confidence', 'Positive_Prob', 'Negative_Prob'])
     
     for entry in history:
         writer.writerow([
             entry['timestamp'], entry['text'], entry['sentiment'],
-            entry['confidence'], entry['pos_prob'], entry['neg_prob']
+            f"{entry['confidence']:.4f}", f"{entry['pos_prob']:.4f}", f"{entry['neg_prob']:.4f}"
         ])
     
-    return output.getvalue()
+    temp_file.close()
+    return temp_file.name, f"Exported {len(history)} entries to CSV"
 
 def export_history_json():
-    """Export history to JSON"""
+    """Export history to JSON file"""
     if not history:
-        return None
+        return None, "No history to export"
     
-    return json.dumps(history, indent=2)
+    # Create temporary file
+    temp_file = tempfile.NamedTemporaryFile(mode='w', delete=False, suffix='.json', encoding='utf-8')
+    json.dump(history, temp_file, indent=2, ensure_ascii=False)
+    temp_file.close()
+    
+    return temp_file.name, f"Exported {len(history)} entries to JSON"
 
 def keyword_heatmap():
     """Keyword sentiment heatmap"""
@@ -467,7 +476,7 @@ def tfidf_analysis():
 def plot_history():
     """Analysis history visualization"""
     if len(history) < 2:
-        return None
+        return None, f"History contains {len(history)} entries. Need at least 2 for visualization."
     
     indices = list(range(len(history)))
     pos_probs = [item['pos_prob'] for item in history]
@@ -491,13 +500,18 @@ def plot_history():
     ax2.grid(True, alpha=0.3)
     
     plt.tight_layout()
-    return fig
+    return fig, f"History contains {len(history)} analyses"
 
 def clear_history():
     """Clear analysis history"""
     global history
+    count = len(history)
     history.clear()
-    return "History cleared successfully"
+    return f"Cleared {count} entries from history"
+
+def get_history_status():
+    """Get current history status"""
+    return f"History contains {len(history)} entries"
 
 # Enhanced example data
 EXAMPLE_REVIEWS = [
@@ -592,17 +606,18 @@ with gr.Blocks(theme=gr.themes.Soft(), title="Movie Sentiment Analyzer") as demo
         with gr.Row():
             refresh_btn = gr.Button("Refresh History", variant="secondary")
             clear_btn = gr.Button("Clear History", variant="stop")
+            status_btn = gr.Button("Check Status", variant="secondary")
         
         with gr.Row():
             export_csv_btn = gr.Button("Export CSV", variant="secondary")
             export_json_btn = gr.Button("Export JSON", variant="secondary")
         
-        with gr.Row():
-            csv_download = gr.File(label="CSV Download", visible=False)
-            json_download = gr.File(label="JSON Download", visible=False)
-        
         history_status = gr.Textbox(label="Status", interactive=False)
         history_plot = gr.Plot(label="Historical Analysis Trends")
+        
+        # File downloads
+        csv_file_output = gr.File(label="Download CSV", visible=True)
+        json_file_output = gr.File(label="Download JSON", visible=True)
     
     # Event handlers
     analyze_btn.click(
@@ -627,20 +642,33 @@ with gr.Blocks(theme=gr.themes.Soft(), title="Movie Sentiment Analyzer") as demo
     network_btn.click(cooccurrence_network, outputs=network_plot)
     tfidf_btn.click(tfidf_analysis, outputs=tfidf_plot)
     
-    refresh_btn.click(plot_history, outputs=history_plot)
-    clear_btn.click(clear_history, outputs=history_status)
+    refresh_btn.click(
+        plot_history, 
+        outputs=[history_plot, history_status]
+    )
+    
+    clear_btn.click(
+        clear_history, 
+        outputs=history_status
+    )
+    
+    status_btn.click(
+        get_history_status,
+        outputs=history_status
+    )
     
     export_csv_btn.click(
         export_history_csv,
-        outputs=gr.File(label="history.csv")
+        outputs=[csv_file_output, history_status]
     )
     
     export_json_btn.click(
         export_history_json,
-        outputs=gr.File(label="history.json")
+        outputs=[json_file_output, history_status]
     )
 
-demo.launch(share=True)
+if __name__ == "__main__":
+    demo.launch(share=True)