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 * All rights reserved. 
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met: 
 * 
 * *   Redistributions of source code must retain the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer. 
 * *   Redistributions in binary form must reproduce the above 
 *     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 
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
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 */

using System;
using System.Collections.Generic;
using XenAdmin.Network;
using System.Windows.Forms;
using System.IO;
using XenAdmin.Core;
using XenAdmin;
using XenAPI;

namespace XenAdmin.Commands
{
    /// <summary>
    /// export resource report for the pool.
    /// </summary>
    internal class ExportResourceReportCommand : Command
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        public ExportResourceReportCommand()
        {
        }

        public ExportResourceReportCommand(IMainWindow mainWindow, IEnumerable<SelectedItem> selection)
            : base(mainWindow, selection)
        {
        }

        public ExportResourceReportCommand(IMainWindow mainWindow, SelectedItem selection)
            : base(mainWindow, selection)
        {
        }
        
        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            if (selection.Count == 1)
            {
                if (CanExecute(selection[0]))
                {
                    Execute(selection[0].Connection);
                }
            }
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            if (selection.Count == 1)
            {
                return CanExecute(selection[0]);
            }
            return false;
        }

        private static bool CanExecute(SelectedItem selection)
        {
            bool isPoolOrStandalone = selection.XenObject is Pool 
                || (selection.XenObject is Host && Helpers.GetPool(selection.Connection) == null);

            if (selection.Connection != null && selection.Connection.IsConnected && isPoolOrStandalone)
                return !Helpers.FeatureForbidden(selection.Connection, Host.RestrictExportResourceData);
            return false;
        }

        public override string MenuText
        {
            get
            {
                return Messages.MAINWINDOW_EXPORT_POOL_RESOURCE_DATA;
            }
        }

        public override string ContextMenuText
        {
            get
            {
                return Messages.MAINWINDOW_EXPORT_POOL_RESOURCE_DATA;
            }
        }

        private bool Execute(IXenConnection connection)
        {
            SaveFileDialog saveFileDialog = new SaveFileDialog();
            saveFileDialog.Filter = "xls files(*.xls)|*.xls|csv files(*.csv)|*.csv";
            saveFileDialog.FilterIndex = 1;
            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                new XenAdmin.Actions.ExportResourceReportAction(connection, saveFileDialog.FileName, saveFileDialog.FilterIndex).RunAsync();
            }
            return true;
        }
    }
}