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 * with or without modification, are permitted provided 
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 * 
 * *   Redistributions of source code must retain the above 
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 *     following disclaimer. 
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 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
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 */

using System.Collections.Generic;
using XenAdmin.Controls;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Expands the specified tree nodes.
    /// </summary>
    internal class ExpandTreeNodesCommand : Command
    {
        private readonly IList<VirtualTreeNode> _nodes;

        /// <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 ExpandTreeNodesCommand(IMainWindow mainWindow, IList<VirtualTreeNode> nodes)
            : base(mainWindow)
        {
            Util.ThrowIfParameterNull(nodes, "nodes");
            _nodes = nodes;
        }

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            foreach (VirtualTreeNode node in _nodes)
            {
                node.ExpandAll();
            }
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            return SomeCollapsedNodes(_nodes);
        }

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

        private static bool SomeCollapsedNodes(IEnumerable<VirtualTreeNode> nodes)
        {
            foreach (VirtualTreeNode node in nodes)
            {
                if (node.Nodes.Count > 0 && !node.IsExpanded)
                {
                    return true;
                }
                else if (SomeCollapsedNodes(node.Nodes))
                {
                    return true;
                }
            }

            return false;
        }
    }
}