// 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.Immutable;
using System.Composition;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.ExternalAccess.FSharp.NavigateTo;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.NavigateTo;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.ExternalAccess.FSharp.Internal.NavigateTo
{
    [Shared]
    [ExportLanguageService(typeof(INavigateToSearchService), LanguageNames.FSharp)]
    internal class FSharpNavigateToSearchService : INavigateToSearchService
    {
        private readonly IFSharpNavigateToSearchService _service;
 
        [ImportingConstructor]
        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
        public FSharpNavigateToSearchService(IFSharpNavigateToSearchService service)
        {
            _service = service;
        }
 
        public IImmutableSet<string> KindsProvided => _service.KindsProvided;
 
        public bool CanFilter => _service.CanFilter;
 
        public async Task SearchDocumentAsync(
            Document document,
            string searchPattern,
            IImmutableSet<string> kinds,
            Func<ImmutableArray<INavigateToSearchResult>, Task> onResultsFound,
            CancellationToken cancellationToken)
        {
            var results = await _service.SearchDocumentAsync(document, searchPattern, kinds, cancellationToken).ConfigureAwait(false);
            if (results.Length > 0)
                await onResultsFound(results.SelectAsArray(result => (INavigateToSearchResult)new InternalFSharpNavigateToSearchResult(result))).ConfigureAwait(false);
        }
 
        public async Task SearchProjectsAsync(
            Solution solution,
            ImmutableArray<Project> projects,
            ImmutableArray<Document> priorityDocuments,
            string searchPattern,
            IImmutableSet<string> kinds,
            Document? activeDocument,
            Func<ImmutableArray<INavigateToSearchResult>, Task> onResultsFound,
            Func<Task> onProjectCompleted,
            CancellationToken cancellationToken)
        {
            Contract.ThrowIfTrue(projects.IsEmpty);
            Contract.ThrowIfTrue(projects.Select(p => p.Language).Distinct().Count() != 1);
 
            foreach (var project in projects)
            {
                var results = await _service.SearchProjectAsync(project, priorityDocuments, searchPattern, kinds, cancellationToken).ConfigureAwait(false);
                if (results.Length > 0)
                    await onResultsFound(results.SelectAsArray(result => (INavigateToSearchResult)new InternalFSharpNavigateToSearchResult(result))).ConfigureAwait(false);
 
                await onProjectCompleted().ConfigureAwait(false);
            }
        }
    }
}