// 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
 
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Xml.Linq;
using Microsoft.CodeAnalysis.Editor.UnitTests.CodeActions;
using Microsoft.CodeAnalysis.ExtractInterface;
using Microsoft.CodeAnalysis.Notification;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Test.Utilities;
using Microsoft.CodeAnalysis.Text;
 
namespace Microsoft.CodeAnalysis.Editor.UnitTests.ExtractInterface;
 
internal sealed class ExtractInterfaceTestState : IDisposable
{
    public static readonly TestComposition Composition = EditorTestCompositions.EditorFeatures.AddParts(
        typeof(TestExtractInterfaceOptionsService));
 
    private readonly TestHostDocument _testDocument;
    public EditorTestWorkspace Workspace { get; }
    public Document ExtractFromDocument { get; }
    public AbstractExtractInterfaceService ExtractInterfaceService { get; }
    public Solution OriginalSolution { get; }
    public string ErrorMessage { get; private set; }
    public NotificationSeverity ErrorSeverity { get; private set; }
 
    public static ExtractInterfaceTestState Create(
        string markup,
        string languageName,
        CompilationOptions compilationOptions = null,
        ParseOptions parseOptions = null,
        OptionsCollection options = null)
    {
        var workspace =
            markup.Trim().StartsWith("<Workspace>")
                ? EditorTestWorkspace.CreateWorkspace(XElement.Parse(markup), composition: Composition)
                : languageName == LanguageNames.CSharp
                    ? EditorTestWorkspace.CreateCSharp(markup, composition: Composition, compilationOptions: compilationOptions, parseOptions: parseOptions)
                    : EditorTestWorkspace.CreateVisualBasic(markup, composition: Composition, compilationOptions: compilationOptions, parseOptions: parseOptions);
        workspace.SetAnalyzerFallbackAndGlobalOptions(options);
 
        return new ExtractInterfaceTestState(workspace);
    }
 
    public ExtractInterfaceTestState(EditorTestWorkspace workspace)
    {
        Workspace = workspace;
 
        OriginalSolution = Workspace.CurrentSolution;
        _testDocument = Workspace.Documents.SingleOrDefault(d => d.CursorPosition.HasValue);
 
        if (_testDocument == null)
        {
            throw new ArgumentException("markup does not contain a cursor position", nameof(workspace));
        }
 
        ExtractFromDocument = Workspace.CurrentSolution.GetDocument(_testDocument.Id);
        ExtractInterfaceService = ExtractFromDocument.GetLanguageService<AbstractExtractInterfaceService>();
    }
 
    public TestExtractInterfaceOptionsService TestExtractInterfaceOptionsService
    {
        get
        {
            return (TestExtractInterfaceOptionsService)ExtractFromDocument.Project.Solution.Services.GetService<IExtractInterfaceOptionsService>();
        }
    }
 
    public Task<ExtractInterfaceTypeAnalysisResult> GetTypeAnalysisResultAsync(TypeDiscoveryRule typeDiscoveryRule)
    {
        return ExtractInterfaceService.AnalyzeTypeAtPositionAsync(
            ExtractFromDocument,
            _testDocument.CursorPosition.Value,
            typeDiscoveryRule,
            CancellationToken.None);
    }
 
    public Task<ExtractInterfaceResult> ExtractViaCommandAsync()
    {
        return ExtractInterfaceService.ExtractInterfaceAsync(
            ExtractFromDocument,
            _testDocument.CursorPosition.Value,
            (errorMessage, severity) =>
            {
                this.ErrorMessage = errorMessage;
                this.ErrorSeverity = severity;
            },
            CancellationToken.None);
    }
 
    public async Task<Solution> ExtractViaCodeAction()
    {
        var actions = await ExtractInterfaceService.GetExtractInterfaceCodeActionAsync(
            ExtractFromDocument,
            new TextSpan(_testDocument.CursorPosition.Value, 1),
            CancellationToken.None);
 
        var action = actions.Single();
 
        var options = (ExtractInterfaceOptionsResult)action.GetOptions(CancellationToken.None);
        var changedOptions = new ExtractInterfaceOptionsResult(
            options.IsCancelled,
            options.IncludedMembers,
            options.InterfaceName,
            options.FileName,
            ExtractInterfaceOptionsResult.ExtractLocation.SameFile);
 
        var operations = await action.GetOperationsAsync(
            this.OriginalSolution, changedOptions, CodeAnalysisProgress.None, CancellationToken.None);
        foreach (var operation in operations)
        {
            operation.Apply(Workspace, CancellationToken.None);
        }
 
        return Workspace.CurrentSolution;
    }
 
    public void Dispose()
    {
        Workspace?.Dispose();
    }
}