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


namespace XenAdmin.Commands
{
    /// <summary>
    /// Shows the attach virtual disk dialog for the specified VM.
    /// </summary>
    internal class AttachVirtualDiskCommand : 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 AttachVirtualDiskCommand()
        {
        }

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

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

        protected override void RunCore(SelectedItemCollection selection)
        {
            VM vm = (VM)selection[0].XenObject;

            if (vm.VBDs.Count >= vm.MaxVBDsAllowed())
            {
                using (var dlg = new ErrorDialog(FriendlyErrorNames.VBDS_MAX_ALLOWED)
                    {WindowTitle = Messages.DISK_ATTACH})
                {
                    dlg.ShowDialog(Program.MainWindow);
                }
            }
            else
            {
                new AttachDiskDialog(vm).ShowPerXenObject(vm, Program.MainWindow);
            }
        }

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