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


namespace XenAdmin.Commands
{
    /// <summary>
    /// Launches the Copy-Template dialog for the specified VM.
    /// </summary>
    internal class CopyTemplateCommand : 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 CopyTemplateCommand()
        {
        }

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

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

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

            if (CrossPoolCopyTemplateCommand.CanExecute(template, null))
                new CrossPoolCopyTemplateCommand(MainWindowCommandInterface, selection).Execute();
            else
                MainWindowCommandInterface.ShowPerXenModelObjectWizard(template, new CopyVMDialog(template));
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            return selection.ContainsOneItemOfType<VM>() && selection.AtLeastOneXenObjectCan<VM>(CanExecute);
        }

        private static bool CanExecute(VM vm)
        {
            if (vm != null && vm.is_a_template && !vm.is_a_snapshot && !vm.Locked && vm.allowed_operations != null && !vm.InternalTemplate())
            {
                if (CrossPoolCopyTemplateCommand.CanExecute(vm, null))
                    return true;
                if (vm.allowed_operations.Contains(vm_operations.clone) || vm.allowed_operations.Contains(vm_operations.copy))
                    return true;
            }
            return false;
        }

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