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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
namespace Timeline.Services.User
{
/// <summary>
/// Represents a user's permissions.
/// </summary>
public class UserPermissions : IEnumerable<UserPermission>, IEquatable<UserPermissions>
{
public static UserPermissions AllPermissions { get; } = new UserPermissions(Enum.GetValues<UserPermission>());
/// <summary>
/// Create an instance containing given permissions.
/// </summary>
/// <param name="permissions">Permission list.</param>
public UserPermissions(params UserPermission[] permissions) : this(permissions as IEnumerable<UserPermission>)
{
}
/// <summary>
/// Create an instance containing given permissions.
/// </summary>
/// <param name="permissions">Permission list.</param>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="permissions"/> is null.</exception>
public UserPermissions(IEnumerable<UserPermission> permissions)
{
if (permissions == null) throw new ArgumentNullException(nameof(permissions));
_permissions = new SortedSet<UserPermission>(permissions);
}
private readonly SortedSet<UserPermission> _permissions = new();
/// <summary>
/// Check if a permission is contained in the list.
/// </summary>
/// <param name="permission">The permission to check.</param>
/// <returns>True if contains. Otherwise false.</returns>
public bool Contains(UserPermission permission)
{
return _permissions.Contains(permission);
}
/// <summary>
/// To a serializable string list.
/// </summary>
/// <returns>A string list.</returns>
public List<string> ToStringList()
{
return _permissions.Select(p => p.ToString()).ToList();
}
/// <summary>
/// Convert a string list to user permissions.
/// </summary>
/// <param name="list">The string list.</param>
/// <returns>An instance.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="list"/> is null.</exception>
/// <exception cref="ArgumentException">Thrown when there is unknown permission name.</exception>
public static UserPermissions FromStringList(IEnumerable<string> list)
{
List<UserPermission> permissions = new();
foreach (var value in list)
{
if (Enum.TryParse<UserPermission>(value, false, out var result))
{
permissions.Add(result);
}
else
{
throw new ArgumentException("Unknown permission name.", nameof(list));
}
}
return new UserPermissions(permissions);
}
public IEnumerator<UserPermission> GetEnumerator()
{
return _permissions.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return ((IEnumerable)_permissions).GetEnumerator();
}
public bool Equals(UserPermissions? other)
{
if (other == null)
return false;
return _permissions.SequenceEqual(other._permissions);
}
public override bool Equals(object? obj)
{
return Equals(obj as UserPermissions);
}
public override int GetHashCode()
{
int result = 0;
foreach (var permission in Enum.GetValues<UserPermission>())
{
if (_permissions.Contains(permission))
{
result += 1;
}
result <<= 1;
}
return result;
}
}
}
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