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 * *   Redistributions of source code must retain the above 
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 *     following disclaimer. 
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 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
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using System;
using System.Linq;
using System.ComponentModel;
using XenAdmin.Network;
using XenAdmin.Controls.DataGridViewEx;
using XenAPI;

namespace XenAdmin.Dialogs
{
    public partial class PvsSiteDialog : XenDialogBase
    {
        /// <summary>
        /// Creates a dialog for viewing the PVS sites and PVS servers on a particular connection.
        /// </summary>
        /// <param name="_connection">May not be null.</param>
        public PvsSiteDialog(IXenConnection _connection)
        {
            System.Diagnostics.Trace.Assert(_connection != null);
            connection = _connection;

            InitializeComponent();
            Text = string.Format(Messages.PVS_SITE_DIALOG_TITLE, this.connection.Name);

            System.Diagnostics.Trace.Assert(gridView.Columns.Count > 0);
            gridView.Columns[0].DefaultCellStyle.NullValue = null;

            RegisterEventHandlers();
            Rebuild();
        }

        private void RegisterEventHandlers()
        {
            UnregisterEventHandlers();
            connection.Cache.RegisterBatchCollectionChanged<PVS_site>(PvsSiteBatchCollectionChanged);
            connection.Cache.RegisterBatchCollectionChanged<PVS_server>(PvsServerBatchCollectionChanged);
        }

        private void UnregisterEventHandlers()
        {
            connection.Cache.DeregisterBatchCollectionChanged<PVS_site>(PvsSiteBatchCollectionChanged);
            connection.Cache.DeregisterBatchCollectionChanged<PVS_server>(PvsServerBatchCollectionChanged);
        }

        private void PvsSiteBatchCollectionChanged(object sender, EventArgs e)
        {
            Program.Invoke(this, Rebuild);
        }

        private void PvsServerBatchCollectionChanged(object sender, EventArgs e)
        {
            Program.Invoke(this, Rebuild);
        }

        protected override void OnClosing(CancelEventArgs e)
        {
            UnregisterEventHandlers();

            base.OnClosing(e);
        }

        private void Rebuild()
        {
            Program.AssertOnEventThread();

            try
            {
                gridView.SuspendLayout();
                gridView.Rows.Clear();

                var pvsSites = connection.Cache.PVS_sites.ToList();
                pvsSites.Sort();

                foreach (var pvsSite in pvsSites)
                {
                    var siteRow = new CollapsingPvsSiteServerDataGridViewRow(pvsSite);
                    gridView.Rows.Add(siteRow);

                    foreach (var pvsServer in connection.ResolveAll(pvsSite.servers))
                    {
                        var serverRow = new CollapsingPvsSiteServerDataGridViewRow(pvsServer);
                        gridView.Rows.Add(serverRow);
                    }
                }
            }
            finally
            {
                gridView.ResumeLayout();
            }
        }

        private void closeButton_Click(object sender, EventArgs e)
        {
            Close();
        }
    }
}