Update app.py

app.py

@@ -6,7 +6,7 @@ import os
 from threading import Thread
 
 import dash
-from dash import dcc, html, Input, Output, State
+from dash import dcc, html, Input, Output, State, callback_context
 import dash_bootstrap_components as dbc
 import pandas as pd
 import plotly.graph_objs as go
@@ -38,7 +38,12 @@ app.layout = dbc.Container([
                 },
                 multiple=False
             ),
-            dbc.Input(id="instructions", placeholder="Describe the analysis you want...", type="text"),
+            html.Div(id='upload-feedback', className="mt-2"),
+            html.Div([
+                html.Span(id='filename-display', className="mr-2"),
+                dbc.Button("Delete File", id="delete-file-button", color="danger", className="mt-2", style={'display': 'none'})
+            ], className="mt-2"),
+            dbc.Input(id="instructions", placeholder="Describe the analysis you want...", type="text", className="mt-3"),
             dbc.Button("Generate Insights", id="submit-button", color="primary", className="mt-3"),
         ])
     ], className="mb-4"),
@@ -55,7 +60,8 @@ app.layout = dbc.Container([
                 ])
             ])
         ]
-    )
+    ),
+    dcc.Store(id='uploaded-data')
 ], fluid=True)
 
 def parse_contents(contents, filename):
@@ -150,13 +156,51 @@ def generate_plot(df, plot_info):
     fig.update_layout(title=plot_info['title'], xaxis_title=plot_info['x'], yaxis_title=plot_info['y'])
     return fig
 
+@app.callback(
+    [Output('upload-feedback', 'children'),
+     Output('filename-display', 'children'),
+     Output('delete-file-button', 'style'),
+     Output('uploaded-data', 'data')],
+    [Input('upload-data', 'contents'),
+     Input('delete-file-button', 'n_clicks')],
+    [State('upload-data', 'filename')]
+)
+def update_upload_feedback(contents, delete_clicks, filename):
+    ctx = callback_context
+    if not ctx.triggered:
+        return dash.no_update, dash.no_update, dash.no_update, dash.no_update
+    
+    trigger_id = ctx.triggered[0]['prop_id'].split('.')[0]
+
+    if trigger_id == 'delete-file-button':
+        return "File deleted.", "", {'display': 'none'}, None
+    
+    if contents is not None:
+        df = parse_contents(contents, filename)
+        if df is not None:
+            return (
+                dbc.Alert("File uploaded successfully!", color="success"),
+                f"Uploaded: {filename}",
+                {'display': 'inline-block'},
+                contents
+            )
+        else:
+            return (
+                dbc.Alert("Error parsing the file. Please upload a valid CSV or Excel file.", color="danger"),
+                "",
+                {'display': 'none'},
+                None
+            )
+    
+    return dash.no_update, dash.no_update, dash.no_update, dash.no_update
+
 @app.callback(
     [Output('visualization-1', 'figure'),
      Output('visualization-2', 'figure'),
      Output('visualization-3', 'figure'),
      Output('error-message', 'children')],
     [Input('submit-button', 'n_clicks')],
-    [State('upload-data', 'contents'),
+    [State('uploaded-data', 'data'),
      State('upload-data', 'filename'),
      State('instructions', 'value')]
 )