// 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.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Host;

namespace Microsoft.CodeAnalysis.MoveDeclarationNearReference;

internal interface IMoveDeclarationNearReferenceService : ILanguageService
{
    /// <summary>
    /// Returns <see langword="true"/> for <c>canMove</c> if <paramref name="localDeclarationStatement"/> is local
    /// declaration statement that can be moved forward to be closer to its first reference.
    /// </summary>
    Task<(bool canMove, bool mayChangeSemantics)> CanMoveDeclarationNearReferenceAsync(Document document, SyntaxNode localDeclarationStatement, CancellationToken cancellationToken);

    /// <summary>
    /// Moves <paramref name="localDeclarationStatement"/> closer to its first reference. Only
    /// applicable if <see cref="CanMoveDeclarationNearReferenceAsync"/> returned
    /// <code>true</code>.  If not, then the original document will be returned unchanged.
    /// </summary>
    Task<Document> MoveDeclarationNearReferenceAsync(Document document, SyntaxNode localDeclarationStatement, CancellationToken cancellationToken);
}