Order.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SDP_Project
{
    class Order
    {
        public required string Id { get; set; }
        public required string DeliveryAddress { get; set; }
        public required DateTime DeliveryTime { get; set; }
        public required double Amount { get; set; }
        public PaymentStatus PaymentStatus { get; set; }
        public OrderState? State { get; set; }
        public required PaymentStrategy PaymentStrategy { get; set; }
        public List<OrderItem> OrderItems { get; set; }
        public Restaurant? Restaurant { get; set; } 
        public double TotalPrice { get; set; } 

        public Order()
        {
            OrderItems = new List<OrderItem>();
            PaymentStatus = PaymentStatus.Pending;
            State = new InCartState(this);
        }

        public void Submit()
        {
            if (State == null)
            {
                Console.WriteLine("Order is no longer active (cancelled or archived).");
                return;
            }
            State.Submit();
        }

        public void Pay()
        {
            if (State == null)
            {
                Console.WriteLine("Order is no longer active (cancelled or archived).");
                return;
            }
            State.Pay();
        }

        public void Confirm()
        {
            if (State == null)
            {
                Console.WriteLine("Order is no longer active (cancelled or archived).");
                return;
            }
            State.Confirm();
        }

        public void Reject()
        {
            if (State == null)
            {
                Console.WriteLine("Order is no longer active (cancelled or archived).");
                return;
            }
            State.Reject();
        }

        public void Cancel()
        {
            if (State == null)
            {
                Console.WriteLine("Order is no longer active (cancelled or archived).");
                return;
            }
            State.Cancel();
        }

        public void StartPreparation()
        {
            if (State == null)
            {
                Console.WriteLine("Order is no longer active (cancelled or archived).");
                return;
            }
            State.StartPreparation();
        }

        public void StartDelivery()
        {
            if (State == null)
            {
                Console.WriteLine("Order is no longer active (cancelled or archived).");
                return;
            }
            State.StartDelivery();
        }

        public void CompleteDelivery()
        {
            if (State == null)
            {
                Console.WriteLine("Order is no longer active (cancelled or archived).");
                return;
            }
            State.CompleteDelivery();
        }

        public void ProcessPayment()
        {
            bool success = PaymentStrategy.Pay(TotalPrice);
            if (success)
            {
                Console.WriteLine("Payment received.");
                PaymentStatus = PaymentStatus.Paid;
                State = new PendingConfirmationState(this);
            }
            else
            {
                Console.WriteLine("Payment failed.");
                PaymentStatus = PaymentStatus.Failed;
            }
        }

        public void Refund()
        {
            bool success = PaymentStrategy.Refund(TotalPrice);
            PaymentStatus = PaymentStatus.Refunded;
            if (success)
                Console.WriteLine("Order refunded.");
            else
                Console.WriteLine("Refund failed or not applicable.");
        }

        public void AddOrderItem(OrderItem item)
        {
            OrderItems.Add(item);
            RecalculateTotal();
        }
        
        
        public void RecalculateTotal()
        {
            if (Restaurant != null)
            {
                Amount = Restaurant.CalculateDiscountedTotal(OrderItems);
            }
            else
            {
                Amount = OrderItems.Sum(item => item.Cost);
            }
        }
        
        
        public void SetRestaurant(Restaurant restaurant)
        {
            Restaurant = restaurant;
            RecalculateTotal();
        }
    }
}