// ***********************************************************************
// <summary>
//对象COPY/初始化帮助，通常是防止从视图中传过来的对象属性为空，这其赋初始值
//</summary>
// ***********************************************************************

using System;
using System.Reflection;

namespace CommonTool
{
    public static class ObjectHelper
    {
        public static T CopyTo<T>(this object source) where T:class, new()
        {
            var result = SetDefault(new T()) as T ?? new T();
            source.CopyTo(result);
            return result;
        }
      
        public static void CopyTo<T>(this object source, T target)
            where T : class,new()
        {
            if (source == null)
                return;

            if (target == null)
            {
                target = new T();
            }

            foreach (var property in target.GetType().GetProperties())
            {
                var propertyValue = source.GetType().GetProperty(property.Name).GetValue(source, null);
                if (propertyValue != null)
                {
                    if (propertyValue.GetType().IsClass)
                    {
	                    //EntityFactory.CreateEntity<> ();

                    }
                    target.GetType().InvokeMember(property.Name, BindingFlags.SetProperty, null, target, new[] { propertyValue });
                }

            }

            foreach (var field in target.GetType().GetFields())
            {
                var fieldValue = source.GetType().GetField(field.Name).GetValue(source);
                if (fieldValue != null)
                {
                    target.GetType().InvokeMember(field.Name, BindingFlags.SetField, null, target, new[] { fieldValue });
                }
            }
        }

		private static object SetDefault(object obj)
		{
			PropertyInfo[] fields = obj.GetType().GetProperties();
			foreach (PropertyInfo v in fields)
			{
				if (v.PropertyType == typeof(string) && v.GetValue(obj) == null)
				{
					v.SetValue(obj, "");
				}
				else if (v.PropertyType == typeof(DateTime) && (v.GetValue(obj) == null || (DateTime)v.GetValue(obj) == DateTime.MinValue))
				{
					v.SetValue(obj, DateTime.Now);
				}
				//else if (v.PropertyType.IsClass && v.GetValue(obj) == null)
				//{
				//	EntityFactory.CreateEntity<>();
				//}
			}
			return obj;
		}
	}

	public abstract class EntityFactory
	{
		public static T CreateEntity<T>() where T : class, new()
		{
			T t = Activator.CreateInstance<T>();

			PropertyInfo[] properties = typeof(T).GetProperties();
			foreach (PropertyInfo pi in properties)
			{
				Type type = pi.PropertyType;

				if (type.IsArray)
				{
					pi.SetValue(t, Activator.CreateInstance(type, 10), null);
				}
				else
				{
					pi.SetValue(t, Activator.CreateInstance(type), null);
				}
			}

			return t;
		}
	}
}