// 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.Linq;
using Microsoft.CodeAnalysis;
using Microsoft.VisualStudio.OLE.Interop;
 
namespace Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem;
 
internal partial class VisualStudioWorkspaceImpl
{
    private class AddProjectReferenceUndoUnit : AbstractAddRemoveUndoUnit
    {
        private readonly ProjectId _toProjectId;
 
        public AddProjectReferenceUndoUnit(
            VisualStudioWorkspaceImpl workspace,
            ProjectId fromProjectId,
            ProjectId toProjectId)
            : base(workspace, fromProjectId)
        {
            _toProjectId = toProjectId;
        }
 
        public override void Do(IOleUndoManager pUndoManager)
        {
            var currentSolution = Workspace.CurrentSolution;
            var fromProject = currentSolution.GetProject(FromProjectId);
            var toProject = currentSolution.GetProject(_toProjectId);
 
            if (fromProject != null &&
                toProject != null &&
                !fromProject.ProjectReferences.Any(p => p.ProjectId == _toProjectId))
            {
                var updatedProject = fromProject.AddProjectReference(new ProjectReference(_toProjectId));
                Workspace.TryApplyChanges(updatedProject.Solution);
            }
        }
 
        public override void GetDescription(out string pBstr)
        {
            var currentSolution = Workspace.CurrentSolution;
            var toProject = currentSolution.GetProject(_toProjectId);
            var projectName = toProject?.Name ?? "";
 
            pBstr = string.Format(FeaturesResources.Remove_reference_to_0, projectName);
        }
    }
}