using System;
using System.Collections.Generic;
using System.Linq;
namespace Example.Models
{
public class User
{
public long Id { get; }
public string Name { get; }
public string Email { get; }
public bool Active { get; set; }
public User(long id, string name, string email, bool active = true)
{
Id = id;
Name = name ?? throw new ArgumentNullException(nameof(name));
Email = email ?? throw new ArgumentNullException(nameof(email));
Active = active;
}
public string GetDisplayName()
{
return Active ? Name : $"{Name} (inactive)";
}
public static User CreateUser(string name, string email)
{
return new User(GenerateId(), name, email);
}
private static long GenerateId()
{
return DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
}
public override bool Equals(object obj)
{
if (obj is User other)
{
return Id == other.Id &&
Name == other.Name &&
Email == other.Email &&
Active == other.Active;
}
return false;
}
public override int GetHashCode()
{
return HashCode.Combine(Id, Name, Email, Active);
}
public override string ToString()
{
return $"User {{ Id = {Id}, Name = {Name}, Email = {Email}, Active = {Active} }}";
}
}
public class UserRepository
{
private readonly Dictionary<long, User> _users = new Dictionary<long, User>();
public User Save(User user)
{
if (user == null) throw new ArgumentNullException(nameof(user));
_users[user.Id] = user;
return user;
}
public User FindById(long id)
{
_users.TryGetValue(id, out User user);
return user;
}
public User FindByEmail(string email)
{
return _users.Values.FirstOrDefault(u => u.Email == email);
}
public IEnumerable<User> FindAll()
{
return _users.Values.ToList();
}
public IEnumerable<User> FindActiveUsers()
{
return _users.Values.Where(u => u.Active);
}
public bool DeleteById(long id)
{
return _users.Remove(id);
}
public int Count => _users.Count;
public void Clear()
{
_users.Clear();
}
}
}
