using CommonLang.Property;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace CommonFroms.G2D
{
    public class G2DCreateInstanceDialog : G2DListSelectEditor<G2DCreateInstanceDialog.ClassDefine>
    {
        private G2DCreateInstanceDialog(List<G2DCreateInstanceDialog.ClassDefine> list, ClassDefine selected)
            : base(list, selected)
        {
        }

        public static object ShowCreateInstanceDialog(Type type, IWin32Window owner=null)
        {
            if (type.IsAbstract || type.IsInterface)
            {
                List<Type> types = ReflectionUtil.GetNoneVirtualSubTypes(type);
                List<ClassDefine> defines = new List<ClassDefine>();
                foreach (Type subType in types)
                {
                    defines.Add(new ClassDefine(subType));
                }
                G2DCreateInstanceDialog dialog = new G2DCreateInstanceDialog(defines, null);
                if (dialog.ShowDialog(owner) == DialogResult.OK)
                {
                    ClassDefine define = dialog.SelectedObject;
                    return ReflectionUtil.CreateInstance(define.ValueType);
                }
                return null;
            }
            else
            {
                return ReflectionUtil.CreateInstance(type);
            }
        }

        public class ClassDefine
        {
            public Type ValueType { get; private set; }
            public DescAttribute Desc { get; private set; }
            public ClassDefine(Type subType)
            {
                ValueType = subType;
                Desc = PropertyUtil.GetAttribute<DescAttribute>(subType);
            }
            public override string ToString()
            {
                if (Desc != null)
                {
                    return Desc.Desc;
                }
                else
                {
                    return ValueType.Name;
                }
            }
        }
    }
}