add weekly and bi-weekly frequently

app.py

@@ -65,36 +65,40 @@ def api_backtest():
     
     # 1. Extract and Sanitize Symbol
     symbol = data.get('symbol', '').strip().upper()
-    print(f"DEBUG: Processing {symbol}")
+    print(f"DEBUG: Processing {symbol} with payload: {data}")
 
     if not symbol:
         return jsonify({"error": "Symbol is required"}), 400
 
     try:
-        # 2. Extract Numerical and Logic Inputs (Matching updated JS keys)
+        # 2. Extract and Cast Inputs (Ensuring types match engine requirements)
+        # Note: JS uses 'startDate' (camelCase), Python often uses 'start_date'
         initial = float(data.get('initial_inv', 0))
         monthly = float(data.get('monthly_target', 0))
-        start_date = data.get('start_date', '2024-01-01')
+        start_date = data.get('startDate') or data.get('start_date', '2024-01-01')
+        frequency = data.get('frequency', 'Monthly')
         
-        # Robust Boolean Check for toggles
+        # Robust Boolean Check
         allow_sell = data.get('allow_sell') is True
         allow_frac = data.get('allow_fractional') is True
 
         # 3. Initialize Engines
-        # DataEngine __init__ now calls ensure_data() to download if missing
         data_eng = DataEngine(symbol=symbol)
         
+        # Verify file exists after DataEngine logic
         if not os.path.exists(data_eng.file_path):
             return jsonify({"error": f"Data for {symbol} could not be retrieved."}), 404
             
         strat_eng = StrategyEngine(data_eng)
         
-        # 4. Calculation
-        history = strat_eng.calculate_va_vs_dca(
-            initial_inv=initial, 
-            monthly_target=monthly, 
-            start_date=start_date, 
-            allow_sell=allow_sell, 
+        # 4. Calculation - Calling the correctly named method 'run_simulation'
+        # Ensure arguments match the signature in your engine.py
+        history = strat_eng.run_simulation(
+            start_date=start_date,
+            monthly_goal=monthly,
+            initial_inv=initial,
+            frequency=frequency,
+            allow_sell=allow_sell,
             allow_fractional=allow_frac
         )
 
@@ -104,7 +108,8 @@ def api_backtest():
         import traceback
         print("CRITICAL ERROR in /api/backtest:")
         print(traceback.format_exc()) 
-        return jsonify({"error": "Internal Server Error. Check terminal logs."}), 500
+        # Returning the actual error message helps debugging the '500' faster
+        return jsonify({"error": str(e)}), 500
 
 @app.route('/backtest') # This is the URL you will actually visit
 def backtest_ui():