using System;
using System.Diagnostics;
using System.Collections;
using System.Drawing;
using System.Windows.Forms;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
namespace Netron.Diagramming.Core
{
    // ----------------------------------------------------------------------
    /// <summary>
    /// A tool that copies the selected entities to the clipboard.
    /// </summary>
    // ----------------------------------------------------------------------
    public class CopyTool : AbstractTool
    {
        #region Fields
        #endregion

        #region Constructor

        // ------------------------------------------------------------------
        /// <summary>
        /// Initializes a new instance of the <see cref="T:CopyTool"/> class.
        /// </summary>
        /// <param name="name">string: The name of the tool.</param>
        // ------------------------------------------------------------------
        public CopyTool(string name)
            : base(name)
        {
        }
        #endregion

        #region Methods

        // ------------------------------------------------------------------
        /// <summary>
        /// Called when the tool is activated.
        /// </summary>
        // ------------------------------------------------------------------
        protected override void OnActivateTool()
        {
            if(Selection.SelectedItems.Count == 0)
                return;

            try
            {
                //Clear the Anchors otherwise subsequent Copy operations will 
                // raise an exception due to the fact that the Anchors class 
                // is a static helper class.
                Anchors.Clear();

                // First add the image to the Windows Clipboard so it can be
                // pasted into other applications, like PowerPoint.
                Bitmap image = Selection.ToBitmap();
                Clipboard.SetDataObject(image, true);

                // This will create a volatile collection of entities, but they 
                // need to be unwrapped!  I never managed to get things 
                // working by putting the serialized collection directly onto 
                // the Clipboad. Thanks to Leppie's suggestion it works by
                // putting the Stream onto the Clipboard, which is weird but 
                // it works.
                //MemoryStream copy = Selection.SelectedItems.ToStream();
                //DataFormats.Format format =
                //    DataFormats.GetFormat(typeof(CopyTool).FullName);

                //IDataObject dataObject = new DataObject();
                //dataObject.SetData(format.Name, false, copy);
                //Clipboard.SetDataObject(dataObject, false);

                // Rather than placing the stream of entities on the Windows
                // Clipboard, we're using our custom clipboard to keep the
                // Windows clipboard for moving data across apps.
                NetronClipboard.Clear();
                NetronClipboard.Add(Selection.SelectedItems.Copy());
                
            }
            catch (Exception exc)
            {
                //throw new InconsistencyException(
                //    "The Copy operation failed.", exc);
                MessageBox.Show("Unable to copy the selection.\n\n" +
                    "Error Message: " + exc.Message);
            }
            finally
            {
                DeactivateTool();
            }
        }
        
        #endregion
    }

}