/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the OpenSimulator Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using log4net;
using OpenMetaverse;
using OpenSim.Framework;
using OpenSim.Data;

namespace OpenSim.Data.Null
{
    /// <summary>
    /// Not a proper generic data handler yet - probably needs to actually store the data as well instead of relying
    /// on descendent classes
    /// </summary>
    public class NullGenericDataHandler
    {
        protected List<T> Get<T>(string field, string val, List<T> inputEntities)
        {
            List<T> entities = inputEntities;

                entities
                    = entities.Where(
                        e =>
                        {
                            FieldInfo fi = typeof(T).GetField(field);
                            if (fi == null)
                                throw new NotImplementedException(string.Format("No field {0} for val {1}", field, val));

                            return fi.GetValue(e).ToString() == val;
                        }
                    ).ToList();

            return entities;
        }

        protected List<T> Get<T>(string field, string[] vals, List<T> inputEntities)
        {
            List<T> entities = new List<T>();

            for (int i = 0; i < vals.Length; i++)
            {
                    entities.AddRange (inputEntities.Where(
                        e =>
                        {
                            FieldInfo fi = typeof(T).GetField(field);
                            if (fi == null)
                                throw new NotImplementedException(string.Format("No field {0} for val {1}", field, vals[i]));

                            return fi.GetValue(e).ToString() == vals[i];
                        }
                    ).ToList()
                    );
            }
            return entities;
        }


        protected List<T> Get<T>(string[] fields, string[] vals, List<T> inputEntities)
        {
            List<T> entities = inputEntities;

            for (int i = 0; i < fields.Length; i++)
            {
                entities
                    = entities.Where(
                        e =>
                        {
                            FieldInfo fi = typeof(T).GetField(fields[i]);
                            if (fi == null)
                                throw new NotImplementedException(string.Format("No field {0} for val {1}", fields[i], vals[i]));

                            return fi.GetValue(e).ToString() == vals[i];
                        }
                    ).ToList();
            }

            return entities;
        }
    }
}