#region Using Statements
using System;
using System.Reflection;
#endregion // Using Statements

#region License

//
// This file is part of the ANX.Framework created by the "ANX.Framework developer group".
//
// This file is released under the Ms-PL license.
//
//
//
// Microsoft Public License (Ms-PL)
//
// This license governs use of the accompanying software. If you use the software, you accept this license. 
// If you do not accept the license, do not use the software.
//
// 1.Definitions
//   The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning 
//   here as under U.S. copyright law.
//   A "contribution" is the original software, or any additions or changes to the software.
//   A "contributor" is any person that distributes its contribution under this license.
//   "Licensed patents" are a contributor's patent claims that read directly on its contribution.
//
// 2.Grant of Rights
//   (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations 
//       in section 3, each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to 
//       reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution
//       or any derivative works that you create.
//   (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in 
//       section 3, each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed
//       patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution 
//       in the software or derivative works of the contribution in the software.
//
// 3.Conditions and Limitations
//   (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks.
//   (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software, your 
//       patent license from such contributor to the software ends automatically.
//   (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and attribution 
//       notices that are present in the software.
//   (D) If you distribute any portion of the software in source code form, you may do so only under this license by including
//       a complete copy of this license with your distribution. If you distribute any portion of the software in compiled or 
//       object code form, you may only do so under a license that complies with this license.
//   (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees,
//       or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the
//       extent permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a 
//       particular purpose and non-infringement.

#endregion // License

namespace ANX.Framework.Content
{
    public class ReflectiveReader<T> : ContentTypeReader
    {
        private int typeVersion;
        public override int TypeVersion { get { return typeVersion; } }
        public ContentTypeReader TargetTypeReader { get; private set; }
        private ConstructorInfo constructor;

        public ReflectiveReader()
            : base(typeof(T))
        {
            BindingFlags bindingFlags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
            this.constructor = TargetType.GetConstructor(bindingFlags, null, Type.EmptyTypes, null);

            object[] attr = TargetType.GetCustomAttributes(typeof(ContentSerializerTypeVersionAttribute), false);
            if (attr.Length == 1)
            {
                this.typeVersion = (attr[0] as ContentSerializerTypeVersionAttribute).TypeVersion;
            }
        }

        protected internal override void Initialize(ContentTypeReaderManager manager)
        {
            if (TargetType != null && TargetType != typeof(object) && !TargetType.IsValueType)
            {
                this.TargetTypeReader = manager.GetTypeReader(TargetType);
            }

            BindingFlags bindingFlags = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.DeclaredOnly | BindingFlags.Instance;
            PropertyInfo[] propInfos = TargetType.GetProperties(bindingFlags);
            FieldInfo[] fieldInfos = TargetType.GetFields(bindingFlags);
        }

        protected internal override object Read(ContentReader input, object existingInstance)
        {
            if (input == null)
            {
                throw new ArgumentNullException("input");
            }

            if (existingInstance == null)
            {
                if (constructor != null)
                {
                    existingInstance = constructor.Invoke(null);
                }
                else
                {
                    if (this.TargetType.IsValueType)
                    {
                        existingInstance = default(T);
                    }

                    throw new ContentLoadException(String.Format("No default constructor given for type {0}", TargetType));
                }
            }
            if (TargetTypeReader != null)
            {
                existingInstance = TargetTypeReader.Read(input, existingInstance);
            }
            return existingInstance;    
        }
    }
}