// Kyoo - A portable and vast media library solution.
// Copyright (c) Kyoo.
//
// See AUTHORS.md and LICENSE file in the project root for full license information.
//
// Kyoo is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// Kyoo is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Kyoo. If not, see <https://www.gnu.org/licenses/>.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;
using Kyoo.Abstractions.Models.Exceptions;
using Kyoo.Authentication.Models;

namespace Kyoo.Authentication;

/// <summary>
/// Extension methods.
/// </summary>
public static class Extensions
{
	/// <summary>
	/// Get the permissions of an user.
	/// </summary>
	/// <param name="user">The user</param>
	/// <returns>The list of permissions</returns>
	public static ICollection<string> GetPermissions(this ClaimsPrincipal user)
	{
		return user.Claims.FirstOrDefault(x => x.Type == Claims.Permissions)?.Value.Split(',')
			?? Array.Empty<string>();
	}

	/// <summary>
	/// Get the id of the current user or null if unlogged or invalid.
	/// </summary>
	/// <param name="user">The user.</param>
	/// <returns>The id of the user or null.</returns>
	public static Guid? GetId(this ClaimsPrincipal user)
	{
		Claim? value = user.FindFirst(Claims.Id);
		if (Guid.TryParse(value?.Value, out Guid id))
			return id;
		return null;
	}

	public static Guid GetIdOrThrow(this ClaimsPrincipal user)
	{
		Guid? ret = user.GetId();
		if (ret == null)
			throw new UnauthorizedException();
		return ret.Value;
	}
}
