﻿// 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.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Test.Utilities;
using Microsoft.VisualStudio.Shell.TableManager;
using Roslyn.Test.Utilities;
using Roslyn.VisualStudio.IntegrationTests;
using Roslyn.VisualStudio.IntegrationTests.InProcess;
using Xunit;

namespace Roslyn.VisualStudio.NewIntegrationTests.CSharp
{
    [Trait(Traits.Feature, Traits.Features.GoToImplementation)]
    public class CSharpGoToImplementation : AbstractEditorTest
    {
        protected override string LanguageName => LanguageNames.CSharp;

        public CSharpGoToImplementation()
            : base(nameof(CSharpGoToImplementation))
        {
        }

        [IdeTheory]
        [CombinatorialData]
        public async Task SimpleGoToImplementation(bool asyncNavigation)
        {
            await TestServices.Editor.ConfigureAsyncNavigation(asyncNavigation ? AsyncNavigationKind.Asynchronous : AsyncNavigationKind.Synchronous, HangMitigatingCancellationToken);

            var project = ProjectName;
            await TestServices.SolutionExplorer.AddFileAsync(project, "FileImplementation.cs", cancellationToken: HangMitigatingCancellationToken);
            await TestServices.SolutionExplorer.OpenFileAsync(project, "FileImplementation.cs", HangMitigatingCancellationToken);
            await TestServices.Editor.SetTextAsync(
@"class Implementation : IGoo
{
}", HangMitigatingCancellationToken);
            await TestServices.SolutionExplorer.AddFileAsync(project, "FileInterface.cs", cancellationToken: HangMitigatingCancellationToken);
            await TestServices.SolutionExplorer.OpenFileAsync(project, "FileInterface.cs", HangMitigatingCancellationToken);
            await TestServices.Editor.SetTextAsync(
@"interface IGoo 
{
}", HangMitigatingCancellationToken);
            await TestServices.Editor.PlaceCaretAsync("interface IGoo", charsOffset: 0, HangMitigatingCancellationToken);
            await TestServices.Editor.GoToImplementationAsync(HangMitigatingCancellationToken);

            string identifierWithCaret;
            if (!asyncNavigation)
            {
                // The navigation completed synchronously; no further action necessary
                identifierWithCaret = "Implementation$$";
            }
            else
            {
                // The navigation completed asynchronously, so navigate to the first item in the results list
                Assert.Equal($"'IGoo' implementations - Entire solution", await TestServices.Shell.GetActiveWindowCaptionAsync(HangMitigatingCancellationToken));
                var results = await TestServices.FindReferencesWindow.GetContentsAsync(HangMitigatingCancellationToken);
                AssertEx.EqualOrDiff(
                    $"<unknown>: class Implementation : IGoo",
                    string.Join(Environment.NewLine, results.Select(result => $"{result.GetItemOrigin()?.ToString() ?? "<unknown>"}: {result.GetText()}")));
                results[0].NavigateTo(isPreview: false, shouldActivate: true);

                await TestServices.Workarounds.WaitForNavigationAsync(HangMitigatingCancellationToken);

                identifierWithCaret = "$$Implementation";
            }

            Assert.Equal($"FileImplementation.cs", await TestServices.Shell.GetActiveDocumentFileNameAsync(HangMitigatingCancellationToken));
            await TestServices.EditorVerifier.TextContainsAsync($@"class {identifierWithCaret}", assertCaretPosition: true, HangMitigatingCancellationToken);
            Assert.False(await TestServices.Shell.IsActiveTabProvisionalAsync(HangMitigatingCancellationToken));
        }

        [IdeTheory]
        [CombinatorialData]
        public async Task GoToImplementationOpensProvisionalTabIfDocumentNotOpen(bool asyncNavigation)
        {
            await TestServices.Editor.ConfigureAsyncNavigation(asyncNavigation ? AsyncNavigationKind.Asynchronous : AsyncNavigationKind.Synchronous, HangMitigatingCancellationToken);

            var project = ProjectName;
            await TestServices.SolutionExplorer.AddFileAsync(project, "FileImplementation.cs", cancellationToken: HangMitigatingCancellationToken);
            await TestServices.SolutionExplorer.OpenFileAsync(project, "FileImplementation.cs", HangMitigatingCancellationToken);
            await TestServices.Editor.SetTextAsync(
@"class Implementation : IBar
{
}
", HangMitigatingCancellationToken);
            await TestServices.SolutionExplorer.CloseCodeFileAsync(project, "FileImplementation.cs", saveFile: true, HangMitigatingCancellationToken);
            await TestServices.SolutionExplorer.AddFileAsync(project, "FileInterface.cs", cancellationToken: HangMitigatingCancellationToken);
            await TestServices.SolutionExplorer.OpenFileAsync(project, "FileInterface.cs", HangMitigatingCancellationToken);
            await TestServices.Editor.SetTextAsync(
@"interface IBar
{
}", HangMitigatingCancellationToken);
            await TestServices.Editor.PlaceCaretAsync("interface IBar", charsOffset: 0, HangMitigatingCancellationToken);
            await TestServices.Editor.GoToImplementationAsync(HangMitigatingCancellationToken);

            string identifierWithCaret;
            if (!asyncNavigation)
            {
                // The navigation completed synchronously; no further action necessary
                identifierWithCaret = "Implementation$$";
            }
            else
            {
                // The navigation completed asynchronously, so navigate to the first item in the results list
                Assert.Equal($"'IBar' implementations - Entire solution", await TestServices.Shell.GetActiveWindowCaptionAsync(HangMitigatingCancellationToken));
                var results = await TestServices.FindReferencesWindow.GetContentsAsync(HangMitigatingCancellationToken);
                AssertEx.EqualOrDiff(
                    $"<unknown>: class Implementation : IBar",
                    string.Join(Environment.NewLine, results.Select(result => $"{result.GetItemOrigin()?.ToString() ?? "<unknown>"}: {result.GetText()}")));
                results[0].NavigateTo(isPreview: true, shouldActivate: true);

                await TestServices.Workarounds.WaitForNavigationAsync(HangMitigatingCancellationToken);

                identifierWithCaret = "$$Implementation";
            }

            Assert.Equal("FileImplementation.cs", await TestServices.Shell.GetActiveWindowCaptionAsync(HangMitigatingCancellationToken));
            await TestServices.EditorVerifier.TextContainsAsync($@"class {identifierWithCaret}", assertCaretPosition: true, HangMitigatingCancellationToken);
            Assert.True(await TestServices.Shell.IsActiveTabProvisionalAsync(HangMitigatingCancellationToken));
        }

        [IdeTheory]
        [CombinatorialData]
        public async Task GoToImplementationFromMetadataAsSource(bool asyncNavigation)
        {
            await TestServices.Editor.ConfigureAsyncNavigation(asyncNavigation ? AsyncNavigationKind.Asynchronous : AsyncNavigationKind.Synchronous, HangMitigatingCancellationToken);

            var project = ProjectName;
            await TestServices.SolutionExplorer.AddFileAsync(project, "FileImplementation.cs", cancellationToken: HangMitigatingCancellationToken);
            await TestServices.SolutionExplorer.OpenFileAsync(project, "FileImplementation.cs", HangMitigatingCancellationToken);
            await TestServices.Editor.SetTextAsync(
@"using System;

class Implementation : IDisposable
{
    public void SomeMethod()
    {
        IDisposable d;
    }
}", HangMitigatingCancellationToken);
            await TestServices.Editor.PlaceCaretAsync("IDisposable d", charsOffset: -1, HangMitigatingCancellationToken);
            await TestServices.Editor.GoToDefinitionAsync(HangMitigatingCancellationToken);
            Assert.Equal("IDisposable [decompiled] [Read Only]", await TestServices.Shell.GetActiveWindowCaptionAsync(HangMitigatingCancellationToken));
            await TestServices.Editor.GoToImplementationAsync(HangMitigatingCancellationToken);

            string identifierWithCaret;
            if (!asyncNavigation)
            {
                // The navigation completed synchronously; no further action necessary
                identifierWithCaret = "Implementation$$";
            }
            else
            {
                // The navigation completed asynchronously, so navigate to the first item in the results list
                Assert.Equal($"'IDisposable' implementations - Entire solution", await TestServices.Shell.GetActiveWindowCaptionAsync(HangMitigatingCancellationToken));
                var results = await TestServices.FindReferencesWindow.GetContentsAsync(HangMitigatingCancellationToken);

                // This test includes results from metadata on this path, so filter those out
                results = results.WhereAsArray(result => result.GetItemOrigin() != ItemOrigin.ExactMetadata);

                AssertEx.EqualOrDiff(
                    $"<unknown>: class Implementation : IDisposable",
                    string.Join(Environment.NewLine, results.Select(result => $"{result.GetItemOrigin()?.ToString() ?? "<unknown>"}: {result.GetText()}")));
                results[0].NavigateTo(isPreview: false, shouldActivate: true);

                await TestServices.Workarounds.WaitForNavigationAsync(HangMitigatingCancellationToken);

                identifierWithCaret = "$$Implementation";
            }

            Assert.Equal($"FileImplementation.cs", await TestServices.Shell.GetActiveDocumentFileNameAsync(HangMitigatingCancellationToken));
            await TestServices.EditorVerifier.TextContainsAsync($@"class {identifierWithCaret} : IDisposable", assertCaretPosition: true, HangMitigatingCancellationToken);
        }

        [IdeTheory]
        [CombinatorialData]
        public async Task GoToImplementationFromSourceAndMetadata(bool asyncNavigation)
        {
            await TestServices.Editor.ConfigureAsyncNavigation(asyncNavigation ? AsyncNavigationKind.Asynchronous : AsyncNavigationKind.Synchronous, HangMitigatingCancellationToken);

            var project = ProjectName;
            await TestServices.SolutionExplorer.AddFileAsync(project, "FileImplementation.cs", cancellationToken: HangMitigatingCancellationToken);
            await TestServices.SolutionExplorer.OpenFileAsync(project, "FileImplementation.cs", HangMitigatingCancellationToken);
            await TestServices.Editor.SetTextAsync(
@"using System;

class Implementation : IDisposable
{
    public void Dispose()
    {
    }
}", HangMitigatingCancellationToken);
            await TestServices.SolutionExplorer.CloseCodeFileAsync(project, "FileImplementation.cs", saveFile: true, HangMitigatingCancellationToken);

            await TestServices.SolutionExplorer.AddFileAsync(project, "FileUsage.cs", cancellationToken: HangMitigatingCancellationToken);
            await TestServices.SolutionExplorer.OpenFileAsync(project, "FileUsage.cs", HangMitigatingCancellationToken);
            await TestServices.Editor.SetTextAsync(
@"using System;

class C
{
    void M()
    {
        IDisposable c;
        try
        {
            c = new Implementation();
        }
        finally
        {
            c.Dispose();
        }
    }
}", HangMitigatingCancellationToken);

            await TestServices.Editor.PlaceCaretAsync("Dispose", charsOffset: -1, HangMitigatingCancellationToken);

            // This one won't automatically navigate to the implementation
            Assert.Equal($"FileUsage.cs", await TestServices.Shell.GetActiveDocumentFileNameAsync(HangMitigatingCancellationToken));
            await TestServices.Editor.GoToImplementationAsync(HangMitigatingCancellationToken);
            Assert.Equal("'Dispose' implementations - Entire solution", await TestServices.Shell.GetActiveWindowCaptionAsync(HangMitigatingCancellationToken));

            var results = await TestServices.FindReferencesWindow.GetContentsAsync(HangMitigatingCancellationToken);

            // There are a lot of results, no point transcribing them all into a test
            Assert.Contains(results, r => r.GetText() == "public void Dispose()" && Path.GetFileName(r.GetDocumentName()) == "FileImplementation.cs");
            Assert.Contains(results, r => r.GetText() == "void Stream.Dispose()" && r.GetDocumentName() == "Stream");
        }
    }
}
