// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

#nullable disable

using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Globalization;
using System.Reflection;

namespace System.Windows.Forms
{
    public class ColumnHeaderConverter : ExpandableObjectConverter
    {
        /// <summary>
        ///  Gets a value indicating whether this converter can
        ///  convert an object to the given destination type using the context.
        /// </summary>
        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
        {
            if (destinationType == typeof(InstanceDescriptor))
            {
                return true;
            }
            return base.CanConvertTo(context, destinationType);
        }

        /// <summary>
        ///  Converts the given object to another type.  The most common types to convert
        ///  are to and from a string object.  The default implementation will make a call
        ///  to ToString on the object if the object is valid and if the destination
        ///  type is string.  If this cannot convert to the desitnation type, this will
        ///  throw a NotSupportedException.
        /// </summary>
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
        {
            if (destinationType is null)
            {
                throw new ArgumentNullException(nameof(destinationType));
            }

            if (destinationType == typeof(InstanceDescriptor) && value is ColumnHeader)
            {
                ColumnHeader col = (ColumnHeader)value;
                ConstructorInfo ctor;

                Type t = TypeDescriptor.GetReflectionType(value);
                InstanceDescriptor id = null;

                if (col.ImageIndex != -1)
                {
                    ctor = t.GetConstructor(new Type[] { typeof(int) });
                    if (ctor != null)
                    {
                        id = new InstanceDescriptor(ctor, new object[] { col.ImageIndex }, false);
                    }
                }

                if (id is null && !string.IsNullOrEmpty(col.ImageKey))
                {
                    ctor = t.GetConstructor(new Type[] { typeof(string) });
                    if (ctor != null)
                    {
                        id = new InstanceDescriptor(ctor, new object[] { col.ImageKey }, false);
                    }
                }

                if (id is null)
                {
                    ctor = t.GetConstructor(Array.Empty<Type>());
                    if (ctor != null)
                    {
                        return new InstanceDescriptor(ctor, Array.Empty<object>(), false);
                    }
                    else
                    {
                        throw new ArgumentException(string.Format(SR.NoDefaultConstructor, t.FullName));
                    }
                }
                return id;
            }

            return base.ConvertTo(context, culture, value, destinationType);
        }
    }
}
