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 * 
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 * with or without modification, are permitted provided 
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 * *   Redistributions of source code must retain the above 
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 *     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.Collections.Generic;
using System.Linq;
using XenAdmin.Actions;
using XenAPI;


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

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

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

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

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

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

        public override string MenuText => Messages.MAINWINDOW_TRIM_SR;

        protected override string GetCantRunReasonCore(IXenObject item)
        {
            if (item is SR sr && !sr.SupportsTrim())
            {
                return Messages.TOOLTIP_SR_TRIM_UNSUPPORTED;
            }
            return base.GetCantRunReasonCore(item);
        }

        public override string DisabledToolTipText
        {
            get
            {
                var selection = GetSelection();

                var unsupportedCount = selection.Count(i => i.XenObject is SR sr && !sr.SupportsTrim());
                if (unsupportedCount == selection.Count)
                {
                    if (unsupportedCount > 1)
                        return Messages.TOOLTIP_SR_TRIM_UNSUPPORTED_MULTIPLE;
                    if (unsupportedCount == 1)
                        return Messages.TOOLTIP_SR_TRIM_UNSUPPORTED;
                }

                return null;
            }
        }

        protected override bool ConfirmationRequired => true;

        protected override string ConfirmationDialogTitle => Messages.CONFIRM_TRIM_SR_TITLE;

        protected override string ConfirmationDialogText => Messages.CONFIRM_TRIM_SR;
    }
}