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using System;
using System.Collections.Generic;
using System.Text;
using XenAPI;
using XenAdmin.Actions;
using XenAdmin.Core;
using XenAdmin.Dialogs;
using System.Collections.ObjectModel;
using XenAdmin.Actions.VMActions;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Creates a template from the selected snapshot. Shows a confirmation dialog.
    /// </summary>
    internal class NewTemplateFromSnapshotCommand : 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 NewTemplateFromSnapshotCommand()
        {
        }

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

        public NewTemplateFromSnapshotCommand(IMainWindow mainWindow, VM snapshot)
            : base(mainWindow, snapshot)
        {
        }

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

            // Generate list of all taken VM/snapshot/template names
            List<string> takenNames = new List<VM>(snapshot.Connection.Cache.VMs).ConvertAll(v => v.Name);

            // Generate a unique suggested name for the new template
            string defaultName = Helpers.MakeUniqueName(String.Format(Messages.TEMPLATE_FROM_SNAPSHOT_DEFAULT_NAME, snapshot.Name), takenNames);
            string newName = InputPromptDialog.Prompt(Parent, Messages.NEW_TEMPLATE_PROMPT, Messages.SAVE_AS_TEMPLATE, defaultName, "VMSnapshotPage");

            if (newName != null) // is null if user cancelled
            {
                // TODO: work out what the new description should be
                var action = new VMCloneAction(snapshot, newName, "");
                action.Completed += new EventHandler<EventArgs>(action_Completed);
                action.RunAsync();
            }
        }

        void action_Completed(object sender, EventArgs e)
        {
            AsyncAction action = (AsyncAction)sender;
            var vm = action.Connection.Resolve(new XenRef<VM>(action.Result));
            if (vm != null)
                new SetVMOtherConfigAction(vm.Connection, vm, "instant", "true").RunAsync();

        }

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

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