Update app.py

app.py

@@ -1,5 +1,5 @@
 # app.py
-# @title Beer Game Final Version (v4.14 - Fixed NameError)
+# @title Beer Game Final Version (v4.15 - Fixed Unpacking Error)
 
 # -----------------------------------------------------------------------------
 # 1. Import Libraries
@@ -368,6 +368,7 @@ def plot_results(df: pd.DataFrame, title: str, human_role: str):
     plot_data = []
     for _, row in df.iterrows():
         for e in echelons:
+            # Safely access keys, provide default if missing (e.g., first few weeks)
             plot_data.append({'week': row.get('week', 0), 'echelon': e,
                 'inventory': row.get(f'{e}.inventory', 0), # Use end-of-week inventory for plots
                 'order_placed': row.get(f'{e}.order_placed', 0),
@@ -388,12 +389,14 @@ def plot_results(df: pd.DataFrame, title: str, human_role: str):
     axes[1].legend()
     axes[1].set_ylabel('Ordered/Produced (Units)')
 
-    total_costs = plot_df.loc[plot_df.groupby('echelon')['week'].idxmax()]
+    # Ensure total_cost calculation handles potential missing data gracefully
+    total_costs = plot_df.loc[plot_df.groupby('echelon')['week'].idxmax()] # Get row with max week for each echelon
     total_costs = total_costs.set_index('echelon')['total_cost'].reindex(echelons, fill_value=0)
     total_costs.plot(kind='bar', ax=axes[2], rot=0)
     axes[2].set_title('Total Cumulative Cost')
     axes[2].set_ylabel('Cost ($)')
 
+    # Safely access human decision columns
     human_cols = [f'{human_role}.initial_order', f'{human_role}.ai_suggestion', f'{human_role}.order_placed']
     human_df_cols = ['week'] + [col for col in human_cols if col in df.columns]
     human_df = df[human_df_cols].copy()
@@ -403,7 +406,7 @@ def plot_results(df: pd.DataFrame, title: str, human_role: str):
         f'{human_role}.order_placed': 'Your Final Order'
     }, inplace=True)
 
-    if len(human_df.columns) > 1:
+    if len(human_df.columns) > 1: # Check if there's data to plot
         human_df.plot(x='week', ax=axes[3], marker='o', linestyle='-')
         axes[3].set_title(f'Analysis of Your ({human_role}) Decisions')
         axes[3].set_ylabel('Order Quantity')
@@ -502,7 +505,6 @@ else:
             **Conclusion:** Think 3 weeks ahead! Your order in Week 10 arrives at the start of Week 13.
             """)
 
-        # =============== NEW: Understanding Inventory & Backlog ===============
         st.subheader("4. Understanding Inventory & Backlog")
         st.markdown("""
         Managing your inventory and backlog is key to minimizing costs. Here's how they work:
@@ -510,20 +512,18 @@ else:
         * **If you DON'T have enough inventory:**
             * You ship **all** the inventory you have.
             * The remaining unfilled "Orders to Fill" becomes your **new Backlog** for next week.
-            * **Backlog is cumulative!** If you have a backlog of 5 and get a new order for 8 but can only ship 10, your new backlog is `(5 + 8) - 10 = 3`.
+            * **Backlog is cumulative!** If you start Week 10 with a backlog of 5, get an order for 8 (total needed = 13), receive 10 units, and ship those 10 units, your new backlog for Week 11 is `13 - 10 = 3`.
         * **If you DO have enough inventory:**
             * You ship all the "Orders to Fill".
             * Your Backlog becomes 0.
             * The remaining inventory is carried over to next week (and incurs holding costs).
         """)
-        # ====================================================================
 
         st.subheader("5. The Bullwhip Effect (What to Avoid)")
         st.markdown("""
         The "Bullwhip Effect" happens when small changes in customer demand cause **amplified**, chaotic swings in orders further up the supply chain (like you and the Factory). This often leads to cycles of **panic ordering** (ordering too much when out of stock) followed by **massive inventory pile-ups** (when late orders arrive). This cycle is very expensive. Try to order smoothly.
         """)
 
-        # =============== UPDATED: How Each Week Works & Dashboard Explanation ===============
         st.subheader("6. How Each Week Works & Understanding Your Dashboard")
         st.markdown(f"""
         Your main job is simple: place one order each week based on the dashboard presented to you.
@@ -549,7 +549,7 @@ else:
 
         Submitting your final order ends the week. The system then calculates your `Weekly Cost` based on your inventory/backlog *after* Step 3 shipping, logs everything, and advances to the next week.
         """)
-        # ==============================================================================
+
 
         st.markdown("---")
         st.header("⚙️ Game Configuration")
@@ -566,7 +566,7 @@ else:
     # --- Main Game Interface ---
     elif 'game_state' in st.session_state and st.session_state.game_state.get('game_running'):
         state = st.session_state.game_state
-        week, human_role, echelons, info_sharing = state['week'], state['echelons'], state['info_sharing']
+        week, human_role, echelons, info_sharing = state['week'], state['human_role'], state['echelons'], state['info_sharing']
         # Define echelon order for display in the UI
         echelon_order = ["Retailer", "Wholesaler", "Distributor", "Factory"]