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using System.Collections.Generic;
using System.Windows.Forms;
using XenAdmin.Core;
using XenAdmin.Dialogs;
using XenAdmin.Wizards.DRWizards;
using XenAPI;


namespace XenAdmin.Commands
{
    internal class DisasterRecoveryCommand : Command
    {
        private DRFailoverWizard _wizard;

        /// <summary>
        /// Initializes a new instance of this Command. The parameter-less constructor is required in the derived
        /// class if it is to be attached to a ToolStrip menu item or button. It should not be used in any other scenario.
        /// </summary>
        public DisasterRecoveryCommand()
        {
        }

        public DisasterRecoveryCommand(IMainWindow mainWindow, IEnumerable<SelectedItem> selection)
            : base(mainWindow, selection)
        {
        }
        /// <summary>
        /// Initializes a new instance of the <see cref="DRFailoverCommand"/> class. 
        /// </summary>
        /// <param name="mainWindow">The main window interface. It can be found at MainWindow.CommandInterface.</param>
        public DisasterRecoveryCommand(IMainWindow mainWindow)
            : base(mainWindow)
        {
        }

        public DisasterRecoveryCommand(IMainWindow mainWindow, IXenObject selection)
            : base(mainWindow, selection)
        {
        }


        protected override void ExecuteCore(SelectedItemCollection selection)
        {

            var pool = Helpers.GetPoolOfOne(selection.FirstAsXenObject.Connection);
            if (pool != null)
            {
                if (Helpers.FeatureForbidden(pool.Connection, Host.RestrictDR))
                {
                    ShowUpsellDialog(Parent);
                }
                else
                {
                    _wizard = new DRFailoverWizard(pool);
                    this.MainWindowCommandInterface.ShowPerConnectionWizard(pool.Connection, _wizard);
                }
            }
        }

        public static void ShowUpsellDialog(IWin32Window parent)
        {
            // Show upsell dialog
            UpsellDialog dlg = new UpsellDialog(Messages.UPSELL_BLURB_DR, InvisibleMessages.UPSELL_LEARNMOREURL_DR);
            dlg.ShowDialog(parent);
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
			return selection.FirstAsXenObject != null && selection.FirstAsXenObject.Connection != null &&  selection.FirstAsXenObject.Connection.IsConnected
				&& (selection.PoolAncestor != null || selection.HostAncestor != null); //CA-61207: this check ensures there's no cross-pool selection
        }

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

    /// <summary>
    /// This command is only used by the MainWindow DR menu item containing the items that launch the DR wizards
    /// </summary>
    internal class DRCommand : Command
    {
        public DRCommand()
        {
        }

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

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            return new DRConfigureCommand(MainWindowCommandInterface, selection).CanExecute()
                   || new DisasterRecoveryCommand(MainWindowCommandInterface, selection).CanExecute();
        }

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