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 * 
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 *     following disclaimer. 
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 *     following disclaimer in the documentation and/or other 
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 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
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 */

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



namespace XenAdmin.Commands
{
    /// <summary>
    /// Shows the properties dialog for the selected XenObject.
    /// </summary>
    internal class EnablePvsReadCachingCommand : Command
    {
        /// <summary>
        /// Initializes a new instance of this Command. The parameter-less constructor is required if 
        /// this Command is to be attached to a ToolStrip menu item or button. It should not be used in any other scenario.
        /// </summary>
        public EnablePvsReadCachingCommand()
        {
        }

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

        public EnablePvsReadCachingCommand(IMainWindow mainWindow, IXenObject xenObject)
            : base(mainWindow, xenObject)
        {
        }

        protected virtual void Run(IList<VM> vms)
        {
            using (var dlg = new EnablePvsReadCachingDialog(vms))
            {
                dlg.ShowDialog(Program.MainWindow);
            }
        }

        protected override void RunCore(SelectedItemCollection selection)
        {
            Run(selection.AsXenObjects<VM>());
        }

        protected override bool CanRunCore(SelectedItemCollection selection)
        {
            // Must have a selection, of all VMs
            if (selection.Any() &&  selection.AllItemsAre<VM>())
            {
                // Must all be in the same pool, which must have at least one PVS site
                var connection = selection.GetConnectionOfAllItems();
                if (connection == null || !connection.Cache.PVS_sites.Any())
                {
                    return false;
                }

                // At least one must not currently have a PVS Proxy
                var vms = selection.AsXenObjects<VM>();
                if (vms.Any(vm => vm.PvsProxy() == null))
                {
                    return true;
                }
            }

            return false;
        }

        public override string ButtonText
        {
            get { return Messages.ENABLE_PVS_READ_CACHING_BUTTON; }
        }

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