// 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
 
extern alias InteractiveHost;
 
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Test.Utilities;
using Microsoft.VisualStudio.Text.Editor.OptionsExtensionMethods;
using Roslyn.Test.Utilities;
using Xunit;
using InteractiveHost::Microsoft.CodeAnalysis.Interactive;
using Microsoft.CodeAnalysis.Editor.UnitTests;
using Microsoft.VisualStudio.InteractiveWindow;
using Microsoft.VisualStudio.Utilities;
using Microsoft.CodeAnalysis.Options;
 
namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Interactive.Commands;
 
[UseExportProvider]
public sealed class ResetInteractiveTests
{
    private const string WorkspaceXmlStr =
@"<Workspace>
    <Project Language=""Visual Basic"" AssemblyName=""ResetInteractiveVisualBasicSubproject"" CommonReferences=""true"">
        <Document FilePath=""VisualBasicDocument""></Document>
    </Project>
    <Project Language=""C#"" AssemblyName=""ResetInteractiveTestsAssembly"" CommonReferences=""true"">
        <ProjectReference>ResetInteractiveVisualBasicSubproject</ProjectReference>
        <Document FilePath=""ResetInteractiveTestsDocument"">
namespace ResetInteractiveTestsDocument
{
    class TestClass
    {
    }
}</Document>
    </Project>
</Workspace>";
 
    [WpfFact]
    [Trait(Traits.Feature, Traits.Features.Interactive)]
    public async Task TestResetREPLWithProjectContext()
    {
        using var workspace = TestWorkspace.Create(WorkspaceXmlStr, composition: EditorTestCompositions.InteractiveWindow);
 
        var project = workspace.CurrentSolution.Projects.FirstOrDefault(p => p.AssemblyName == "ResetInteractiveTestsAssembly");
        var document = project.Documents.FirstOrDefault(d => d.FilePath == "ResetInteractiveTestsDocument");
        var replReferenceCommands = GetProjectReferences(workspace, project).Select(r => CreateReplReferenceCommand(r));
 
        Assert.True(replReferenceCommands.Any(rc => rc.EndsWith(@"ResetInteractiveTestsAssembly.dll""")));
        Assert.True(replReferenceCommands.Any(rc => rc.EndsWith(@"ResetInteractiveVisualBasicSubproject.dll""")));
 
        var expectedReferences = replReferenceCommands.ToList();
        var expectedUsings = new List<string> { @"using ""System"";", @"using ""ResetInteractiveTestsDocument"";" };
        await AssertResetInteractiveAsync(workspace, project, buildSucceeds: true, expectedReferences: expectedReferences, expectedUsings: expectedUsings);
 
        // Test that no submissions are executed if the build fails.
        await AssertResetInteractiveAsync(workspace, project, buildSucceeds: false, expectedReferences: []);
    }
 
    private async Task AssertResetInteractiveAsync(
        TestWorkspace workspace,
        Project project,
        bool buildSucceeds,
        List<string> expectedReferences = null,
        List<string> expectedUsings = null)
    {
        expectedReferences ??= [];
        expectedUsings ??= [];
 
        var testHost = new InteractiveWindowTestHost(workspace.ExportProvider.GetExportedValue<IInteractiveWindowFactoryService>());
        var executedSubmissionCalls = new List<string>();
 
        void executeSubmission(object _, string code) => executedSubmissionCalls.Add(code);
        testHost.Evaluator.OnExecute += executeSubmission;
 
        var uiThreadOperationExecutor = workspace.GetService<IUIThreadOperationExecutor>();
        var editorOptionsService = workspace.GetService<EditorOptionsService>();
        var editorOptions = editorOptionsService.Factory.GetOptions(testHost.Window.CurrentLanguageBuffer);
        var newLineCharacter = editorOptions.GetNewLineCharacter();
 
        var resetInteractive = new TestResetInteractive(
            uiThreadOperationExecutor,
            editorOptionsService,
            CreateReplReferenceCommand,
            CreateImport,
            buildSucceeds: buildSucceeds)
        {
            References = [.. GetProjectReferences(workspace, project)],
            ReferenceSearchPaths = ["rsp1", "rsp2"],
            SourceSearchPaths = ["ssp1", "ssp2"],
            ProjectNamespaces = ["System", "ResetInteractiveTestsDocument", "VisualBasicResetInteractiveTestsDocument"],
            NamespacesToImport = ["System", "ResetInteractiveTestsDocument"],
            ProjectDirectory = "pj",
            Platform = InteractiveHostPlatform.Desktop64,
        };
 
        await resetInteractive.ExecuteAsync(testHost.Window, "Interactive C#");
 
        // Validate that the project was rebuilt.
        Assert.Equal(1, resetInteractive.BuildProjectCount);
        Assert.Equal(0, resetInteractive.CancelBuildProjectCount);
 
        if (buildSucceeds)
        {
            Assert.Equal(InteractiveHostPlatform.Desktop64, testHost.Evaluator.ResetOptions.Platform);
        }
        else
        {
            Assert.Null(testHost.Evaluator.ResetOptions);
        }
 
        var expectedSubmissions = new List<string>();
        if (expectedReferences.Any())
        {
            expectedSubmissions.AddRange(expectedReferences.Select(r => r + newLineCharacter));
        }
 
        if (expectedUsings.Any())
        {
            expectedSubmissions.Add(string.Join(newLineCharacter, expectedUsings) + newLineCharacter);
        }
 
        AssertEx.Equal(expectedSubmissions, executedSubmissionCalls);
 
        testHost.Evaluator.OnExecute -= executeSubmission;
    }
 
    /// <summary>
    /// Simulates getting all project references.
    /// </summary>
    /// <param name="workspace">Workspace with the solution.</param>
    /// <param name="project">A project that should be built.</param>
    /// <returns>A list of paths that should be referenced.</returns>
    private static IEnumerable<string> GetProjectReferences(TestWorkspace workspace, Project project)
    {
        var metadataReferences = project.MetadataReferences.Select(r => r.Display);
        var projectReferences = project.ProjectReferences.SelectMany(p => GetProjectReferences(
            workspace,
            workspace.CurrentSolution.GetProject(p.ProjectId)));
        var outputReference = new string[] { project.OutputFilePath };
 
        return metadataReferences.Union(projectReferences).Concat(outputReference);
    }
 
    private string CreateReplReferenceCommand(string referenceName)
    {
        return $@"#r ""{referenceName}""";
    }
 
    private string CreateImport(string importName)
    {
        return $@"using ""{importName}"";";
    }
}