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using System;
using System.Collections.Generic;
using System.Text;
using XenAPI;
using System.Windows.Forms;
using XenAdmin.Dialogs;
using System.Collections.ObjectModel;
using System.Drawing;

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 ExecuteCore(SelectedItemCollection selection)
        {
            VM vm = (VM)selection[0].XenObject;

            if (vm.VBDs.Count >= vm.MaxVBDsAllowed)
            {
                using (var dlg = new ThreeButtonDialog(
                        new ThreeButtonDialog.Details(
                            SystemIcons.Error,
                            FriendlyErrorNames.VBDS_MAX_ALLOWED,
                            Messages.DISK_ATTACH)))
                {
                    dlg.ShowDialog(Program.MainWindow);
                }
            }
            else
            {
                MainWindowCommandInterface.ShowPerXenModelObjectWizard(vm, new AttachDiskDialog(vm));
            }
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            if (selection.Count == 1)
            {
                VM vm = selection[0].XenObject as VM;

                return vm != null && !vm.is_a_snapshot && !vm.Locked;

            }
            return false;
        }
    }
}