// 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.
 
#nullable disable
 
using System;
using System.Collections.Generic;
using System.Composition;
using System.Linq;
using EnvDTE;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Editor.Shared.Extensions;
using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.PooledObjects;
using Microsoft.CodeAnalysis.ProjectManagement;
using Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem;
using Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.Extensions;
using Roslyn.Utilities;
 
namespace Roslyn.VisualStudio.Services.Implementation.ProjectSystem;
 
[ExportWorkspaceService(typeof(IProjectManagementService), ServiceLayer.Host), Shared]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal class VisualStudioProjectManagementService(IThreadingContext threadingContext) : IProjectManagementService
{
    private readonly IThreadingContext _threadingContext = threadingContext;
 
    public string GetDefaultNamespace(Microsoft.CodeAnalysis.Project project, Workspace workspace)
    {
        _threadingContext.ThrowIfNotOnUIThread();
 
        if (project.Language == LanguageNames.VisualBasic)
        {
            return "";
        }
 
        var defaultNamespace = "";
 
        if (workspace is VisualStudioWorkspaceImpl vsWorkspace)
        {
            vsWorkspace.GetProjectData(project.Id,
                out _, out var envDTEProject);
 
            try
            {
                defaultNamespace = (string)envDTEProject.ProjectItems.ContainingProject.Properties.Item("DefaultNamespace").Value; // Do not Localize
            }
            catch (ArgumentException)
            {
                // DefaultNamespace does not exist for this project.
            }
        }
 
        return defaultNamespace;
    }
 
    public IList<string> GetFolders(ProjectId projectId, Workspace workspace)
    {
        var folders = new List<string>();
 
        if (workspace is VisualStudioWorkspaceImpl vsWorkspace)
        {
            vsWorkspace.GetProjectData(projectId,
                out var hierarchy, out var envDTEProject);
 
            var projectItems = envDTEProject.ProjectItems;
 
            using var _ = ArrayBuilder<Tuple<ProjectItem, string>>.GetInstance(out var projectItemsStack);
 
            // Populate the stack
            projectItems.OfType<ProjectItem>().Where(n => n.IsFolder()).Do(n => projectItemsStack.Push(Tuple.Create(n, "\\")));
            while (projectItemsStack.TryPop(out var projectItemTuple))
            {
                var projectItem = projectItemTuple.Item1;
                var currentFolderPath = projectItemTuple.Item2;
 
                var folderPath = currentFolderPath + projectItem.Name + "\\";
 
                folders.Add(folderPath);
                projectItem.ProjectItems.OfType<ProjectItem>().Where(n => n.IsFolder()).Do(n => projectItemsStack.Push(Tuple.Create(n, folderPath)));
            }
        }
 
        return folders;
    }
}