// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System.Collections;
using System.Collections.ObjectModel;
using System.Linq;
using Microsoft.CodeAnalysis;
using Microsoft.VisualStudio.Shell;
 
namespace Microsoft.VisualStudio.LanguageServices.Implementation.SolutionExplorer
{
    using Workspace = Microsoft.CodeAnalysis.Workspace;
 
    internal class AnalyzersFolderItemSource : IAttachedCollectionSource
    {
        private readonly IVsHierarchyItem _projectHierarchyItem;
        private readonly Workspace _workspace;
        private readonly ProjectId _projectId;
        private readonly ObservableCollection<AnalyzersFolderItem> _folderItems;
        private readonly IAnalyzersCommandHandler _commandHandler;
 
        public AnalyzersFolderItemSource(Workspace workspace, ProjectId projectId, IVsHierarchyItem projectHierarchyItem, IAnalyzersCommandHandler commandHandler)
        {
            _workspace = workspace;
            _projectId = projectId;
            _projectHierarchyItem = projectHierarchyItem;
            _commandHandler = commandHandler;
 
            _folderItems = new ObservableCollection<AnalyzersFolderItem>();
 
            Update();
        }
 
        public bool HasItems
        {
            get
            {
                return true;
            }
        }
 
        public IEnumerable Items
        {
            get
            {
                return _folderItems;
            }
        }
 
        public object SourceItem
        {
            get
            {
                return _projectHierarchyItem;
            }
        }
 
        internal void Update()
        {
            // Don't create the item a 2nd time.
            if (_folderItems.Any())
            {
                return;
            }
 
            _folderItems.Add(
                new AnalyzersFolderItem(
                    _workspace,
                    _projectId,
                    _projectHierarchyItem,
                    _commandHandler.AnalyzerFolderContextMenuController));
        }
    }
}