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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using XenAdmin.Core;
using XenAdmin.Dialogs;
using XenAPI;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Pops up the dialog for managing vApps or VMPPs in XenCenter.
    /// </summary>
    internal class VMGroupCommand<T> : Command where T : XenObject<T>
    {
        /// <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 VMGroupCommand()
        {
        }

        public VMGroupCommand(IMainWindow mainWindow)
            : base(mainWindow)
        {
        }

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

        public VMGroupCommand(IMainWindow mainWindow, IXenObject selection)
            : base(mainWindow, selection)
        {
        }

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            
            var pool = Helpers.GetPoolOfOne(selection.FirstAsXenObject.Connection);
            if (pool != null)
            {
                if (Helpers.FeatureForbidden(pool.Connection, VMGroup<T>.FeatureRestricted)) 
                    ShowUpsellDialog(Parent);
                else
                    this.MainWindowCommandInterface.ShowPerConnectionWizard(pool.Connection, VMGroup<T>.ManageGroupsDialog(pool));
            }
        }

        public static void ShowUpsellDialog(IWin32Window parent)
        {
            UpsellDialog dlg = new UpsellDialog(VMGroup<T>.UpsellBlurb, VMGroup<T>.UpsellLearnMoreUrl); 
            dlg.ShowDialog(parent);
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            if(typeof(T) == typeof(VMPP) && selection.Any(s=>Helpers.ClearwaterOrGreater(s.Connection)))
                return false;

            return selection.FirstAsXenObject != null && selection.FirstAsXenObject.Connection != null && selection.FirstAsXenObject.Connection.IsConnected
                && VMGroup<T>.FeaturePossible(selection.FirstAsXenObject.Connection)
				&& (selection.PoolAncestor != null || selection.HostAncestor != null); //CA-61207: this check ensures there's no cross-pool selection
        }

        protected override string GetCantExecuteReasonCore(SelectedItem item)
        {
            Pool poolAncestor = item.PoolAncestor;

            if (poolAncestor != null)
            {
                string reason = VMGroup<T>.CantExecuteReason(poolAncestor.Connection);
                if (!string.IsNullOrEmpty(reason))
                    return reason;
            }
            return base.GetCantExecuteReasonCore(item);
        }

        public override string ContextMenuText
        {
            get
            {
                return VMGroup<T>.ManageContextMenuString; 
            }
        }

        public override string MenuText
        {
            get
            {
                return VMGroup<T>.ManageMainMenuString;
            }
        }
    }

    /// <summary>
    /// Class used for the benefit of visual studio's form designer which has trouble with generic controls
    /// </summary>
    internal sealed class VMGroupCommandVMPP : VMGroupCommand<VMPP>
    { }

    /// <summary>
    /// Class used for the benefit of visual studio's form designer which has trouble with generic controls
    /// </summary>
    internal sealed class VMGroupCommandVM_appliance : VMGroupCommand<VM_appliance>
    { }
}