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


namespace XenAdmin.Commands
{
    /// <summary>
    /// Shows the add-virtual-disk dialog for the selected VM or SR.
    /// </summary>
    internal class AddVirtualDiskCommand : 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 AddVirtualDiskCommand()
        {
        }

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

        public AddVirtualDiskCommand(IMainWindow mainWindow, VM vm)
            : base(mainWindow, vm)
        {
        }

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

        protected override void RunCore(SelectedItemCollection selection)
        {
            if (selection[0].XenObject is VM vm)
            {
                if (vm.VBDs.Count < vm.MaxVBDsAllowed())
                {
                    new NewDiskDialog(vm.Connection, vm).ShowPerXenObject(vm, Program.MainWindow);
                }
                else
                {
                    using (var dlg = new ErrorDialog(FriendlyErrorNames.VBDS_MAX_ALLOWED)
                        {WindowTitle = Messages.DISK_ADD})
                    {
                        dlg.ShowDialog(Program.MainWindow);
                    }
                }
            }
            else if (selection[0].XenObject is SR sr)
            {
                MainWindowCommandInterface.ShowPerConnectionWizard(sr.Connection, new NewDiskDialog(sr.Connection, sr));
            }
        }

        protected override bool CanRunCore(SelectedItemCollection selection)
        {
            if (selection.Count == 1)
            {
                if (selection[0].XenObject is VM vm)
                    return !vm.is_a_snapshot && !vm.Locked;

                if (selection[0].XenObject is SR sr)
                    return !sr.Locked;
            }

            return false;
        }
    }
}