﻿// 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.Collections.Immutable;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;

namespace Microsoft.CodeAnalysis.CodeRefactorings.MoveType
{
    internal abstract partial class AbstractMoveTypeService<TService, TTypeDeclarationSyntax, TNamespaceDeclarationSyntax, TMemberDeclarationSyntax, TCompilationUnitSyntax>
    {
        private class RenameFileEditor(TService service, State state, string fileName, CancellationToken cancellationToken) : Editor(service, state, fileName, cancellationToken)
        {
            public override Task<ImmutableArray<CodeActionOperation>> GetOperationsAsync()
                => Task.FromResult(RenameFileToMatchTypeName());

            public override Task<Solution> GetModifiedSolutionAsync()
            {
                var modifiedSolution = SemanticDocument.Project.Solution
                    .WithDocumentName(SemanticDocument.Document.Id, FileName);

                return Task.FromResult(modifiedSolution);
            }

            /// <summary>
            /// Renames the file to match the type contained in it.
            /// </summary>
            private ImmutableArray<CodeActionOperation> RenameFileToMatchTypeName()
            {
                var documentId = SemanticDocument.Document.Id;
                var oldSolution = SemanticDocument.Document.Project.Solution;
                var newSolution = oldSolution.WithDocumentName(documentId, FileName);

                return ImmutableArray.Create<CodeActionOperation>(
                    new ApplyChangesOperation(newSolution));
            }
        }
    }
}
