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using System;
using System.Collections.Generic;
using System.Linq;
using Timeline.Models;
namespace Timeline.Entities
{
public sealed class UserInfo
{
public UserInfo()
{
}
public UserInfo(string username, params string[] roles)
{
Username = username;
Roles = roles;
}
public static UserInfo Create(User user)
{
if (user == null)
throw new ArgumentNullException(nameof(user));
return Create(user.Name, user.RoleString);
}
public static UserInfo Create(string username, string roleString) => new UserInfo
{
Username = username,
Roles = RolesFromString(roleString)
};
public string Username { get; set; }
public string[] Roles { get; set; }
public static IEqualityComparer<UserInfo> EqualityComparer { get; } = new EqualityComparerImpl();
public static IComparer<UserInfo> Comparer { get; } = Comparer<UserInfo>.Create(Compare);
private static string[] RolesFromString(string roleString)
{
if (roleString == null)
return null;
return roleString.Split(',').Select(r => r.Trim()).ToArray();
}
private class EqualityComparerImpl : IEqualityComparer<UserInfo>
{
bool IEqualityComparer<UserInfo>.Equals(UserInfo x, UserInfo y)
{
return Compare(x, y) == 0;
}
int IEqualityComparer<UserInfo>.GetHashCode(UserInfo obj)
{
return obj.Username.GetHashCode() ^ NormalizeRoles(obj.Roles).GetHashCode();
}
}
private static string NormalizeRoles(string[] rawRoles)
{
var roles = rawRoles.Where(r => !string.IsNullOrWhiteSpace(r)).Select(r => r.Trim()).ToList();
roles.Sort();
return string.Join(',', roles);
}
public static int Compare(UserInfo left, UserInfo right)
{
if (left == null)
{
if (right == null)
return 0;
return -1;
}
if (right == null)
return 1;
var uc = string.Compare(left.Username, right.Username);
if (uc != 0)
return uc;
var leftRoles = NormalizeRoles(left.Roles);
var rightRoles = NormalizeRoles(right.Roles);
return string.Compare(leftRoles, rightRoles);
}
public override string ToString()
{
return $"Username: {Username} ; Roles: {Roles}";
}
}
}
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