Update app.py

app.py

@@ -51,7 +51,7 @@ class Investment_Simulator:
     
     def update_portfolio_history(self):
         now = datetime.now()
-        total_value = compute_portfolio_value()
+        total_value = compute_portfolio_value(self)
         self.portfolio_history.append((now, total_value))
     
     def plot_portfolio_value(self):
@@ -79,7 +79,7 @@ class Investment_Simulator:
                 self.portfolio["cash"] -= amount
                 self.portfolio["stocks"][ticker] = self.portfolio["stocks"].get(ticker, 0) + qty
                 self.history.append(f"🟢 Bought £{amount} of {ticker} ({qty} shares at £{price:.2f})")
-                update_portfolio_history()
+                update_portfolio_history(self)
                 return f"✅ Bought {qty} shares of {ticker} at £{price:.2f}"
     
             elif "sell" in user_input:
@@ -95,7 +95,7 @@ class Investment_Simulator:
                 self.portfolio["stocks"][ticker] -= qty_to_sell
                 self.portfolio["cash"] += amount
                 self.history.append(f"🔴 Sold £{amount} of {ticker} ({qty_to_sell} shares at £{price:.2f})")
-                update_portfolio_history()
+                update_portfolio_history(self)
                 return f"✅ Sold {qty_to_sell} shares of {ticker} at £{price:.2f}"
     
             elif "portfolio" in user_input:
@@ -122,7 +122,7 @@ class Investment_Simulator:
                 self.portfolio["stocks"].clear()
                 self.history.clear()
                 self.portfolio_history.clear()
-                update_portfolio_history()
+                update_portfolio_history(self)
                 return "🔁 Portfolio reset."
     
             else:
@@ -133,10 +133,10 @@ class Investment_Simulator:
 
     def run_all(self, text):
         response = process_input(text)
-        fig = plot_portfolio_value()
+        fig = plot_portfolio_value(self)
         return response, fig
     
-    update_portfolio_history()
+    update_portfolio_history(self)
 
 # ---------- UI Layout ----------
 custom_css = """