using System;

using System.Collections.Generic;

​

namespace HotelReservationSystem

{

    class Program

    {

        static void Main(string[] args)

        {

            Hotel hotel = new Hotel("Grand Central Hotel", 150.0m);

            hotel.AddRoom(new Room(101));

            hotel.AddRoom(new Room(102));

            hotel.AddRoom(new Room(103));

​

            List<User> users = new List<User>();

            Dictionary<int, Reservation> reservations = new Dictionary<int, Reservation>();

​

            bool running = true;

            while (running)

            {

                Console.WriteLine("Welcome to the Hotel Reservation System");

                Console.WriteLine("1. Register User");

                Console.WriteLine("2. Make a Reservation");

                Console.WriteLine("3. Exit");

                Console.Write("Please select an option: ");

                string option = Console.ReadLine();

​

                switch (option)

                {

                    case "1":

                        Console.Write("Enter your name: ");

                        string userName = Console.ReadLine();

                        Console.Write("Enter your email: ");

                        string userEmail = Console.ReadLine();

                        User newUser = new User(userName, userEmail);

                        users.Add(newUser);

                        Console.WriteLine("User registered successfully!");

                        break;

​

                    case "2":

                        Console.Write("Enter your email to validate: ");

                        string email = Console.ReadLine();

                        User user = users.Find(u => u.Email == email);

​

                        if (user == null)

                        {

                            Console.WriteLine("User not found! Please register first.");

                            break;

                        }

                        hotel.ListRoom();

                        Console.Write("Enter room number to reserve: ");

                        int roomNumber = int.Parse(Console.ReadLine());

                        Room room = hotel.GetRoom(roomNumber);

​

                        if (room == null || room.IsReserved)

                        {

                            Console.WriteLine("Room not available!");

                            break;

                        }

​

                        Console.Write("Enter number of nights: ");

                        int nights = int.Parse(Console.ReadLine());

​

                        DateTime checkInDate = DateTime.Now;

                        DateTime checkOutDate = checkInDate.AddDays(nights);

                        decimal totalPrice = hotel.PricePerNight * nights;

​

                        Reservation reservation = new Reservation(user, room, checkInDate, checkOutDate, totalPrice);

                        reservations.Add(room.RoomNumber, reservation);

                        room.IsReserved = true;

​

                        Console.WriteLine("Reservation successful!");

                        Console.WriteLine($"Reserved by: {user.Name}");

                        Console.WriteLine($"Room Number: {room.RoomNumber}");

                        Console.WriteLine($"Price per night: {hotel.PricePerNight} NZD");

                        Console.WriteLine($"Total Price: {totalPrice} NZD");

                        Console.WriteLine($"Check-in Date: {checkInDate}");

                        Console.WriteLine($"Check-out Date: {checkOutDate}");

​

                        break;

​

                    case "3":

                        running = false;

                        break;

​

                    default:

                        Console.WriteLine("Invalid option. Please try again.");

                        break;

                }

​

                Console.WriteLine();

            }

        }

    }

​

    public class Hotel

    {

        public string Name { get; set; }

        public decimal PricePerNight { get; set; }

        private List<Room> Rooms { get; set; }

​

        public Hotel(string name, decimal pricePerNight)

        {

            Name = name;

            PricePerNight = pricePerNight;

            Rooms = new List<Room>();

        }

​

        public void AddRoom(Room room)

        {

            Rooms.Add(room);

        }

​

        public Room GetRoom(int roomNumber)

        {

            return Rooms.Find(r => r.RoomNumber == roomNumber);

        }

​

        public void ListRoom()

        {

            Console.WriteLine("Available Rooms:");

            foreach (var room in Rooms)

            {

                Console.WriteLine($"Room Number: {room.RoomNumber} - {(room.IsReserved ? "Reserved" : "Available")}");

            }

        }

    }

​

    public class User

    {

        public string Name { get; set; }

        public string Email { get; set; }

​

        public User(string name, string email)

        {

            Name = name;

            Email = email;

        }

    }

​

    public class Room

    {

        public int RoomNumber { get; set; }

        public bool IsReserved { get; set; }

​

        public Room(int roomNumber)

        {

            RoomNumber = roomNumber;

            IsReserved = false;

        }

    }

​

    public class Reservation

    {

        public User User { get; set; }

        public Room Room { get; set; }

        public DateTime CheckInDate { get; set; }

        public DateTime CheckOutDate { get; set; }

        public decimal TotalPrice { get; set; }

​

        public Reservation(User user, Room room, DateTime checkInDate, DateTime checkOutDate, decimal totalPrice)

        {

            User = user;

            Room = room;

            CheckInDate = checkInDate;

            CheckOutDate = checkOutDate;

            TotalPrice = totalPrice;

        }

    }

}