Create app.py

app.py

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+import gradio as gr
+import pandas as pd
+
+# 1. Mock Inventory (Simulates your database)
+INVENTORY = {
+    "Apples (1kg)": 2.50,
+    "Bananas (1kg)": 1.20,
+    "Oranges (1kg)": 1.80,
+    "Mangoes (1kg)": 4.00,
+    "Strawberries (box)": 3.50,
+    "Watermelon (each)": 5.00
+}
+
+def format_cart_df(cart):
+    """Formats the cart state into a pandas DataFrame for UI display."""
+    if not cart:
+        return pd.DataFrame(columns=["Product", "Price ($)", "Quantity", "Total ($)"])
+    df = pd.DataFrame(cart)
+    # Reorder and format columns
+    df = df[["name", "price", "quantity", "total"]]
+    df.columns = ["Product", "Price ($)", "Quantity", "Total ($)"]
+    return df
+
+def calculate_total(cart):
+    """Calculates the sum total of the cart."""
+    total = sum(item['total'] for item in cart)
+    return f"${total:.2f}"
+
+def add_item(cart, fruit, quantity):
+    """Adds a product to the cart or updates its quantity if it already exists."""
+    if not fruit or quantity <= 0:
+        return cart, format_cart_df(cart), gr.update(), calculate_total(cart)
+    
+    price = INVENTORY[fruit]
+    found = False
+    
+    for item in cart:
+        if item['name'] == fruit:
+            item['quantity'] += quantity
+            item['total'] = item['quantity'] * price
+            found = True
+            break
+            
+    if not found:
+        cart.append({
+            "name": fruit,
+            "price": price,
+            "quantity": quantity,
+            "total": price * quantity
+        })
+        
+    choices = [item['name'] for item in cart]
+    return cart, format_cart_df(cart), gr.update(choices=choices), calculate_total(cart)
+
+def remove_item(cart, fruit_to_remove):
+    """Removes a specific product entirely from the cart."""
+    if fruit_to_remove:
+        cart = [item for item in cart if item['name'] != fruit_to_remove]
+        
+    choices = [item['name'] for item in cart]
+    return cart, format_cart_df(cart), gr.update(choices=choices, value=None), calculate_total(cart)
+
+# 2. Gradio User Interface
+with gr.Blocks(theme=gr.themes.Soft(), title="Fruit Cart POS") as demo:
+    gr.Markdown("# 🛒 Fruit Seller Shopping Cart System")
+    gr.Markdown("Streamline billing by adding items from the inventory, removing mistakes, and generating an automated total bill.")
+    
+    # Hidden state to store cart data across interactions
+    cart_state = gr.State([])
+
+    with gr.Row():
+        # Left Column: Controls
+        with gr.Column(scale=1):
+            gr.Markdown("### ➕ Add Products")
+            fruit_dropdown = gr.Dropdown(choices=list(INVENTORY.keys()), label="Select Product")
+            quantity_input = gr.Number(value=1, minimum=1, label="Quantity")
+            add_btn = gr.Button("Add to Cart", variant="primary")
+            
+            gr.Markdown("---")
+            
+            gr.Markdown("### ➖ Remove Products")
+            remove_dropdown = gr.Dropdown(choices=[], label="Select Product to Remove", interactive=True)
+            remove_btn = gr.Button("Remove Item", variant="stop")
+
+        # Right Column: Cart Display
+        with gr.Column(scale=2):
+            gr.Markdown("### 🧾 Current Cart & Billing")
+            cart_display = gr.Dataframe(
+                headers=["Product", "Price ($)", "Quantity", "Total ($)"], 
+                interactive=False,
+                row_count=(5, "dynamic")
+            )
+            total_display = gr.Textbox(label="Total Bill", value="$0.00", text_align="right")
+
+    # 3. Event Listeners (Wiring UI to logic)
+    add_btn.click(
+        fn=add_item,
+        inputs=[cart_state, fruit_dropdown, quantity_input],
+        outputs=[cart_state, cart_display, remove_dropdown, total_display]
+    )
+    
+    remove_btn.click(
+        fn=remove_item,
+        inputs=[cart_state, remove_dropdown],
+        outputs=[cart_state, cart_display, remove_dropdown, total_display]
+    )
+
+# Run the app
+if __name__ == "__main__":
+    demo.launch()