E-commerce Billing System Assignment

[Pankaj-Str]

Objective:

Create an advanced billing system for an e-commerce application that allows users to input product details, apply GST, select discount offers, and calculate the final bill. The system should provide a detailed invoice with a breakdown of each item, taxes, discounts, and the total amount.

Requirements:

1. Product Input:

   • Allow the user to input multiple product details including:
     • Product ID
     • Product Name
     • Quantity
     • Unit Price

2. GST Calculation:

   • Apply GST (Goods and Services Tax) to each product. GST rates should be variable and user-defined (e.g., 5%, 12%, 18%, 28%).

3. Discount Offers:

   • Allow the user to select from various discount offers:
     • Percentage Discount on the total bill (e.g., 5%, 10%, 15%)
     • Fixed Amount Discount on the total bill (e.g., $10, $20)
     • Discount on specific products (e.g., 10% off on Product A)

4. Invoice Generation:

   • Generate a detailed invoice including:
     • Product details (Product ID, Name, Quantity, Unit Price, Subtotal)
     • GST applied
     • Discounts applied
     • Total amount before and after tax and discounts

5. User Interface:

   • Create a simple text-based menu-driven interface to interact with the system.
   • Provide options to:
     • Add a new product
     • View all products
     • Apply GST
     • Apply Discounts
     • Generate and view the final invoice

6. Data Validation:

   • Ensure data validation for user inputs (e.g., numeric values for prices and quantities, valid GST rates).

Example Workflow:

1. Add Products:

   Enter Product ID: 101
   Enter Product Name: Laptop
   Enter Quantity: 2
   Enter Unit Price: 750.00
   

2. Apply GST:

   Enter GST rate (%): 18
   

3. Apply Discounts:

   Select Discount Type:
   1. Percentage Discount on Total Bill
   2. Fixed Amount Discount on Total Bill
   3. Discount on Specific Product
   Enter Choice: 1
   Enter Discount Rate (%): 10
   

4. Generate Invoice:

   -----------------------------------
   E-commerce Billing System Invoice
   -----------------------------------
   Product ID: 101
   Product Name: Laptop
   Quantity: 2
   Unit Price: $750.00
   Subtotal: $1500.00
   GST @ 18%: $270.00
   -----------------------------------
   Total before discount: $1770.00
   Discount @ 10%: $177.00
   -----------------------------------
   Final Total: $1593.00
   -----------------------------------
   

Submission:

Submit the Python script implementing the advanced billing system. Ensure your code is well-documented with comments explaining each part of the logic. Include a README file explaining how to run your program and any dependencies required.

Evaluation Criteria:

• Correctness and completeness of the implemented features
• Code readability and documentation
• Handling of edge cases and data validation
• User interface and user experience

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