Create app_utils.py

app_utils.py

@@ -0,0 +1,32 @@
+from datetime import datetime
+import gradio as gr
+from data_fetcher import get_stocks_from_index
+from stock_analysis import get_stock_graph_and_info
+
+def validate_date(date_string):
+    try:
+        return datetime.strptime(date_string, "%Y-%m-%d").date()
+    except ValueError:
+        return None
+
+def update_stock_options(index):
+    stocks = get_stocks_from_index(index)
+    return gr.Dropdown(choices=stocks)
+
+def process_inputs(*args):
+    idx, stock, interval, graph_type, forecast_method, start_date, end_date = args
+    
+    start = validate_date(start_date)
+    end = validate_date(end_date)
+    
+    if start is None or end is None:
+        return gr.Textbox(value="Invalid date format. Please use YYYY-MM-DD."), None
+    
+    if start > end:
+        return gr.Textbox(value="Start date must be before end date."), None
+    
+    try:
+        return get_stock_graph_and_info(idx, stock, interval, graph_type, forecast_method, start, end)
+    except Exception as e:
+        error_message = f"An error occurred: {str(e)}"
+        return gr.Textbox(value=error_message), None