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using System.Collections.Generic;
using XenAdmin.Dialogs;
using XenAPI;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Launches the change host password dialog for the specified host.
    /// </summary>
    internal class ChangeHostPasswordCommand : Command
    {
        /// <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 ChangeHostPasswordCommand()
        {
        }

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

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            if (selection[0].XenObject is Host host)
                MainWindowCommandInterface.ShowPerConnectionWizard(host.Connection, new ChangeServerPasswordDialog(host));
            else if (selection[0].XenObject is Pool pool)
                MainWindowCommandInterface.ShowPerConnectionWizard(pool.Connection, new ChangeServerPasswordDialog(pool));
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            // Only allow password change if the user is logged in as local root
            // (i.e. disallow password change if the user is logged in via AD)

            if (selection.Count == 1)
            {
                var session = selection[0].Connection?.Session;

                if (session != null && session.IsLocalSuperuser)
                    return selection[0].XenObject is Host host && host.IsLive() || selection[0].XenObject is Pool;
            }

            return false;
        }

        protected override string GetCantExecuteReasonCore(IXenObject item)
        {
            var session = item.Connection?.Session;

            if (session != null && !session.IsLocalSuperuser && (item is Host host && host.IsLive() || item is Pool))
                return Messages.AD_CANNOT_CHANGE_PASSWORD;
            
            return base.GetCantExecuteReasonCore(item);
        }
    }
}