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using System.Collections.Generic;
using System.Collections.ObjectModel;
using XenAPI;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Deletes the selected templates. Shows a confirmation dialog.
    /// </summary>
    internal class DeleteTemplateCommand : DeleteVMCommand
    {
        /// <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 DeleteTemplateCommand()
        {
        }

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

        public DeleteTemplateCommand(IMainWindow mainWindow, SelectedItem selection)
            : base(mainWindow, selection)
        {
        }

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

        protected override bool CanExecute(VM vm)
        {
            return vm != null && vm.is_a_template && !vm.is_a_snapshot && !vm.Locked && vm.allowed_operations != null && vm.allowed_operations.Contains(vm_operations.destroy);
        }

        public override string MenuText
        {
            get
            {
                ReadOnlyCollection<SelectedItem> selection = GetSelection();

                if (selection.Count <= 1)
                {
                    return Messages.MAINWINDOW_DELETE_TEMPLATE;
                }

                return Messages.MAINWINDOW_DELETE_OBJECTS;
            }
        }

        protected override string ErrorDialogText
        {
            get
            {
                return Messages.ERROR_DIALOG_DELETE_TEMPLATE_TEXT;
            }
        }

        protected override string ErrorDialogTitle
        {
            get
            {
                return Messages.ERROR_DIALOG_DELETE_TEMPLATE_TITLE;
            }
        }
    }
}
