// 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 Microsoft.CodeAnalysis.Text.Shared.Extensions;
using Microsoft.VisualStudio.Text;
using Microsoft.VisualStudio.Text.Operations;
using Microsoft.VisualStudio.Utilities;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.Editor.Implementation.TextStructureNavigation;
 
internal abstract partial class AbstractTextStructureNavigatorProvider : ITextStructureNavigatorProvider
{
    private readonly ITextStructureNavigatorSelectorService _selectorService;
    private readonly IContentTypeRegistryService _contentTypeService;
    private readonly IUIThreadOperationExecutor _uiThreadOperationExecutor;
 
    protected AbstractTextStructureNavigatorProvider(
        ITextStructureNavigatorSelectorService selectorService,
        IContentTypeRegistryService contentTypeService,
        IUIThreadOperationExecutor uIThreadOperationExecutor)
    {
        Contract.ThrowIfNull(selectorService);
        Contract.ThrowIfNull(contentTypeService);
 
        _selectorService = selectorService;
        _contentTypeService = contentTypeService;
        _uiThreadOperationExecutor = uIThreadOperationExecutor;
    }
 
    protected abstract bool ShouldSelectEntireTriviaFromStart(SyntaxTrivia trivia);
    protected abstract bool IsWithinNaturalLanguage(SyntaxToken token, int position);
 
    protected virtual TextExtent GetExtentOfWordFromToken(SyntaxToken token, SnapshotPoint position)
        => new(token.Span.ToSnapshotSpan(position.Snapshot), isSignificant: true);
 
    public ITextStructureNavigator CreateTextStructureNavigator(ITextBuffer subjectBuffer)
    {
        var naturalLanguageNavigator = _selectorService.CreateTextStructureNavigator(
            subjectBuffer,
            _contentTypeService.GetContentType("any"));
 
        return new TextStructureNavigator(
            subjectBuffer,
            naturalLanguageNavigator,
            this,
            _uiThreadOperationExecutor);
    }
}