// 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.Generic;
using System.Linq;
using Microsoft.CodeAnalysis;
using Microsoft.VisualStudio.OLE.Interop;
 
namespace Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem;
 
internal partial class VisualStudioWorkspaceImpl
{
    private abstract class AbstractRemoveDocumentUndoUnit : AbstractAddRemoveUndoUnit
    {
        protected readonly DocumentId DocumentId;
 
        protected AbstractRemoveDocumentUndoUnit(
            VisualStudioWorkspaceImpl workspace,
            DocumentId documentId)
            : base(workspace, documentId.ProjectId)
        {
            DocumentId = documentId;
        }
 
        protected abstract IReadOnlyList<DocumentId> GetDocumentIds(Project fromProject);
 
        protected abstract TextDocument? GetDocument(Solution currentSolution);
 
        public override void Do(IOleUndoManager pUndoManager)
        {
            var currentSolution = Workspace.CurrentSolution;
            var fromProject = currentSolution.GetProject(FromProjectId);
 
            if (fromProject != null &&
                GetDocumentIds(fromProject).Contains(DocumentId))
            {
                var updatedProject = fromProject.RemoveDocument(DocumentId);
                Workspace.TryApplyChanges(updatedProject.Solution);
            }
        }
 
        public override void GetDescription(out string pBstr)
        {
            var currentSolution = Workspace.CurrentSolution;
            var document = GetDocument(currentSolution);
            var documentName = document?.Name ?? "";
            pBstr = string.Format(FeaturesResources.Remove_document_0, documentName);
        }
    }
}