// 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.

namespace System.ComponentModel.Design
{
    /// <summary>
    ///  Edits an array of values.
    /// </summary>
    public class ArrayEditor : CollectionEditor
    {
        /// <summary>
        ///  Initializes a new instance of <see cref='ArrayEditor'/>
        ///  using the specified type for the array.
        /// </summary>
        public ArrayEditor(Type type) : base(type)
        {
        }

        /// <summary>
        ///  Gets or sets the data type this collection contains.
        /// </summary>
        protected override Type CreateCollectionItemType()
            => CollectionType?.GetElementType();

        /// <summary>
        ///  Gets the items in the array.
        /// </summary>
        protected override object[] GetItems(object editValue)
        {
            if (editValue is Array valueArray)
            {
                object[] items = new object[valueArray.GetLength(0)];
                Array.Copy(valueArray, items, items.Length);
                return items;
            }

            return Array.Empty<object>();
        }

        /// <summary>
        ///  Sets the items in the array.
        /// </summary>
        protected override object SetItems(object editValue, object[] value)
        {
            if (editValue != null && !(editValue is Array))
            {
                return editValue;
            }

            if (value is null)
            {
                return null;
            }

            Array newArray = Array.CreateInstance(CollectionItemType, value.Length);
            Array.Copy(value, newArray, value.Length);
            return newArray;
        }
    }
}
