// 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;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using System.Threading;
using Microsoft.CodeAnalysis.BraceCompletion;
using Microsoft.CodeAnalysis.Host.Mef;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.AutomaticCompletion;
 
internal abstract class AbstractBraceCompletionServiceFactory(
    IEnumerable<Lazy<IBraceCompletionService, LanguageMetadata>> braceCompletionServices,
    string languageName) : IBraceCompletionServiceFactory
{
    private readonly ImmutableArray<IBraceCompletionService> _braceCompletionServices =
        braceCompletionServices.Where(s => s.Metadata.Language == languageName).SelectAsArray(s => s.Value);
 
    public IBraceCompletionService? TryGetService(ParsedDocument document, int openingPosition, char openingBrace, CancellationToken cancellationToken)
    {
        foreach (var service in _braceCompletionServices)
        {
            cancellationToken.ThrowIfCancellationRequested();
 
            if (service.CanProvideBraceCompletion(openingBrace, openingPosition, document, cancellationToken))
                return service;
        }
 
        return null;
    }
}