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Design an object-oriented restaurant management system that handles menu management (items with categories and availability), table tracking (available / occupied / reserved), reservations and walk-in seating, order placement with per-item status (pending → preparing → ready → served), kitchen queue processing, and billing with tax, service charge, discounts, tip, and bill splitting.
Tables are auto-created with varying capacities. Orders belong to a table and flow through a kitchen queue. Bills are generated from completed orders and include configurable tax (10%) and service charge (5%). Staff (waiters, chefs, hosts) can be assigned to tables.
Menu management
Add/remove/update menu items with categories, prices, and availability
Table management
Track table status (available, occupied, reserved, out-of-service)
Make reservation
Reserve a table for a party size and time; assign an appropriate table
Seat walk-in
Assign the first available table for a walk-in party
Place order
Add menu items (with quantity and special instructions) to a table's order
Kitchen processing
Send order to kitchen queue; track item prep status (pending → preparing → ready)
Generate bill
Calculate subtotal, tax, service charge, discounts, and tip
Pay bill and release table
Accept payment (cash/card/UPI), mark bill paid, release table
Staff assignment
Assign waiters to tables; track clock-in/out
Before diving into code, clarify the use cases and edge cases. Understanding the problem deeply leads to better class design.
Identify the primary actions users will perform. For a parking lot: park vehicle, exit vehicle, check availability. Each becomes a method.
Who interacts with the system? Customers, admins, automated systems? Each actor type may need different interfaces.
What are the limits? Max vehicles, supported vehicle types, payment methods. Constraints drive your data structures.
What happens on overflow? Concurrent access? Payment failures? Thinking about edge cases reveals hidden complexity.