// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Collections.Specialized;
 
namespace System.Private.Windows.Ole;
 
internal static class DataObjectExtensions
{
    extension(IComVisibleDataObject dataObject)
    {
        internal void SetFileDropList(StringCollection filePaths)
        {
            if (filePaths.OrThrowIfNull().Count == 0)
            {
                throw new ArgumentException(SR.CollectionEmptyException);
            }
 
            // Validate the paths to make sure they don't contain invalid characters
            string[] filePathsArray = new string[filePaths.Count];
            filePaths.CopyTo(filePathsArray, 0);
 
            foreach (string path in filePathsArray)
            {
                // These are the only error states for Path.GetFullPath
                if (string.IsNullOrEmpty(path) || path.Contains('\0'))
                {
                    throw new ArgumentException(string.Format(SR.Clipboard_InvalidPath, path ?? "<null>", nameof(filePaths)));
                }
            }
 
            dataObject.SetData(DataFormatNames.FileDrop, autoConvert: true, filePathsArray);
        }
    }
}