using System;
using System.IO;
using System.Globalization;
using System.Drawing.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;
using System.ComponentModel;

namespace Orthogonal.Common
{
	/// <summary>
	/// This class extends the <see cref="UITypeEditor"/> to popup an <see cref="OpenFileDialog"/>
	/// when selected in the <see cref="PropertyGrid"/> control. NOTE: This class is redundant,
	/// as there is a standard class somewhere in the Framework to perform the identical task.
	/// </summary>
	public class FilePickUITypeEditor : UITypeEditor
	{
		//==========================================================================================
		public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
		{
			return UITypeEditorEditStyle.Modal;
		}

		//==========================================================================================
		public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
		{
			IWindowsFormsEditorService edSvc = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
			if( edSvc == null )
				return null;
			// There is no need for edSvc.ShowDialog(form) in this case as we're simply
			// showing a file pick dialog and return the result. No custom form is needed.
			OpenFileDialog dlg = new OpenFileDialog();
			dlg.CheckFileExists = true;
			dlg.FilterIndex = 1;
			dlg.RestoreDirectory = true;
			dlg.Title = "Select the file for the property";
			if ((value != null) && (value is string))
			{
				string val = value.ToString();
				if (Path.IsPathRooted(val))
					dlg.InitialDirectory = Path.GetDirectoryName(val);
				else
					dlg.InitialDirectory = Environment.CurrentDirectory;
				if (Path.HasExtension(val))
				{
					string rawext = Path.GetExtension(val).Substring(1);
					dlg.Filter = string.Format("{0} files (*.{1})|*.{1}|All files (*.*)|*.*",
						rawext.ToUpper(CultureInfo.CurrentCulture),
						rawext);
				}
				else
				{
					dlg.Filter = "All files (*.*)|*.*";
				}
			}
			if (dlg.ShowDialog() == DialogResult.OK)
			{
				return dlg.FileName;
			}
			return base.EditValue (context, provider, value);
		}


	}
}