// 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.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Text;
 
namespace Microsoft.CodeAnalysis.Test.Utilities;
 
internal sealed class TestDocumentServiceProvider : IDocumentServiceProvider
{
    public TestDocumentServiceProvider(bool canApplyChange = true, bool supportDiagnostics = true, bool supportsMappingImportDirectives = false)
    {
        DocumentOperationService = new TestDocumentOperationService()
        {
            CanApplyChange = canApplyChange,
            SupportDiagnostics = supportDiagnostics
        };
 
        SpanMappingService = new TestSpanMappingService(supportsMappingImportDirectives);
    }
 
    public IDocumentOperationService DocumentOperationService { get; }
 
    public ISpanMappingService SpanMappingService { get; }
 
    public TService? GetService<TService>() where TService : class, IDocumentService
    {
        if (DocumentOperationService is TService service)
        {
            return service;
        }
        else if (SpanMappingService is TService spanMappingService)
        {
            return spanMappingService;
        }
 
        return null;
    }
 
    private sealed class TestDocumentOperationService : IDocumentOperationService
    {
        public TestDocumentOperationService()
        {
        }
 
        public bool CanApplyChange { get; set; }
        public bool SupportDiagnostics { get; set; }
    }
 
    private sealed class TestSpanMappingService : ISpanMappingService
    {
        public TestSpanMappingService(bool supportsMappingImportDirectives)
        {
            SupportsMappingImportDirectives = supportsMappingImportDirectives;
        }
 
        public bool SupportsMappingImportDirectives { get; }
 
        public Task<ImmutableArray<(string mappedFilePath, TextChange mappedTextChange)>> GetMappedTextChangesAsync(
            Document oldDocument,
            Document newDocument,
            CancellationToken cancellationToken)
        {
            throw new NotImplementedException();
        }
 
        public Task<ImmutableArray<MappedSpanResult>> MapSpansAsync(Document document, IEnumerable<TextSpan> spans, CancellationToken cancellationToken)
        {
            throw new NotImplementedException();
        }
    }
}