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 *     following disclaimer. 
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 *     following disclaimer in the documentation and/or other 
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 * 
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using System.Collections.Generic;
using XenAdmin.Actions;
using XenAdmin.Core;
using XenAPI;


namespace XenAdmin.Commands
{
    internal class TrimSRCommand : SRCommand
    {
        /// <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 TrimSRCommand()
        {
        }

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

        public TrimSRCommand(IMainWindow mainWindow, SR sr)
            : base(mainWindow, sr)
        {
        }

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            var actions = new List<AsyncAction>();
            foreach (SR sr in selection.AsXenObjects<SR>(CanExecute))
            {
                actions.Add(new SrTrimAction(sr.Connection, sr));
            }
            RunMultipleActions(actions, null, Messages.ACTION_SR_TRIM_DESCRIPTION, Messages.ACTION_SR_TRIM_DONE, true);
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            return selection.AllItemsAre<SR>() && selection.AtLeastOneXenObjectCan<SR>(CanExecute);
        }

        private static bool CanExecute(SR sr)
        {
            return sr != null && sr.SupportsTrim;
        }

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

        protected override string GetCantExecuteReasonCore(SelectedItem item)
        {
            SR sr = item.XenObject as SR;
            if (sr != null && !sr.SupportsTrim)
            {
                return Messages.TOOLTIP_SR_TRIM_UNSUPPORTED;
            }
            return base.GetCantExecuteReasonCore(item);
        }
    }
}