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using System.Collections.Generic;
using XenAPI;
using XenAdmin.Core;
using System.Drawing;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Launches the New VM Wizard with the selected template as the source.
    /// </summary>
    internal class NewVMFromTemplateCommand : Command
    {
        /// <summary>
        /// Initializes a new instance of this Command. The parameter-less constructor is required if 
        /// this Command is to be attached to a ToolStrip menu item or button. It should not be used in any other scenario.
        /// </summary>
        public NewVMFromTemplateCommand()
        {
        }

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

        public NewVMFromTemplateCommand(IMainWindow mainWindow, VM template)
            : base(mainWindow, template)
        {
        }

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            new NewVMCommand(MainWindowCommandInterface, selection).Execute();
        }

        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.Connection.IsConnected)
            {
                Pool pool = Helpers.GetPoolOfOne(vm.Connection);
                return (pool != null && Helpers.PoolHasEnabledHosts(pool));
            }
            return false;
        }

        public override Image MenuImage
        {
            get
            {
                return Images.StaticImages._001_CreateVM_h32bit_16;
            }
        }

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