﻿/* Yet Another Forum.NET
 * Copyright (C) 2006-2013 Jaben Cargman
 * http://www.yetanotherforum.net/
 * 
 * This program 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 2
 * of the License, or (at your option) any later version.
 * 
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

namespace YAF.Core.Extensions
{
    using System.Collections.Generic;
    using System.Linq;

    using YAF.Types.Interfaces;

    public static class HaveSortOrderExtensions
    {
        #region Public Methods and Operators

        public static IEnumerable<T> ByOptionalSortOrder<T>(this IEnumerable<T> sortEnumerable, int defaultSortOrder = 1000)
        {
            return sortEnumerable.Select(
                m =>
                {
                    int sortOrder = defaultSortOrder;
                    var haveSortOrder = (m as IHaveSortOrder);

                    if (haveSortOrder != null)
                    {
                        sortOrder = haveSortOrder.SortOrder;
                    }

                    return new KeyValuePair<int, T>(sortOrder, m);
                })
                .OrderByDescending(m => m.Key)
                .Select(m => m.Value);
        }

        #endregion
    }
}