// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Razor;
using Microsoft.AspNetCore.Razor.Language;
using Microsoft.AspNetCore.Razor.Test.Common;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Razor.Cohost;
using Microsoft.CodeAnalysis.Razor.Logging;
using Microsoft.CodeAnalysis.Razor.Protocol;
using Microsoft.CodeAnalysis.Razor.Remote;
using Microsoft.CodeAnalysis.Razor.Telemetry;
using Microsoft.CodeAnalysis.Text;
using Roslyn.Test.Utilities;
using Xunit;
 
namespace Microsoft.VisualStudio.Razor.LanguageClient.Cohost;
 
public partial class CohostDocumentPullDiagnosticsTest
{
    [Fact]
    public async Task CSharpUnusedUsings_HintDiagnosticsInVSCode()
    {
        var document = CreateProjectAndRazorDocument("""
            @using System
            @using System.Text
 
            <div></div>
 
            @code
            {
                public void BuildsStrings(StringBuilder b)
                {
                }
            }
            """);
 
        var requestInvoker = new TestHtmlRequestInvoker([(VSInternalMethods.DocumentPullDiagnosticName, (VSInternalDiagnosticReport[]?)null)]);
        var result = await MakeDiagnosticsRequestAsync(document, taskListRequest: false, requestInvoker, IncompatibleProjectService, RemoteServiceInvoker, ClientCapabilitiesService, LoggerFactory, DisposalToken);
 
        Assert.NotNull(result);
        var diagnostic = Assert.Single(result);
        Assert.Equal(0, diagnostic.Range.Start.Line);
        Assert.Equal(0, diagnostic.Range.End.Line);
        Assert.Equal("RZ0005", diagnostic.Code.AssumeNotNull().Second);
        Assert.Equal(LspDiagnosticSeverity.Hint, diagnostic.Severity);
 
        var tags = Assert.IsType<DiagnosticTag[]>(diagnostic.Tags);
        Assert.Contains(tags, tag => tag == DiagnosticTag.Unnecessary);
    }
 
    private async Task VerifyDiagnosticsAsync(
        TestCode input,
        VSInternalDiagnosticReport[]? htmlResponse = null,
        RazorFileKind? fileKind = null,
        bool miscellaneousFile = false,
        (string fileName, string contents)[]? additionalFiles = null)
    {
        var document = CreateProjectAndRazorDocument(input.Text, fileKind, miscellaneousFile: miscellaneousFile, additionalFiles: additionalFiles);
        var inputText = await document.GetTextAsync(DisposalToken);
 
        var requestInvoker = new TestHtmlRequestInvoker([(VSInternalMethods.DocumentPullDiagnosticName, htmlResponse)]);
 
        var result = await MakeDiagnosticsRequestAsync(document, taskListRequest: false, requestInvoker, IncompatibleProjectService, RemoteServiceInvoker, ClientCapabilitiesService, LoggerFactory, DisposalToken);
 
        Assert.NotNull(result);
 
        var markers = result.SelectMany(d =>
            new[] {
                (index: inputText.GetTextSpan(d.Range).Start, text: $"{{|{d.Code!.Value.Second}:"),
                (index: inputText.GetTextSpan(d.Range).End, text:"|}")
            });
 
        var testOutput = input.Text;
        // Ordering by text last means start tags get sorted before end tags, for zero width ranges
        foreach (var (index, text) in markers.OrderByDescending(i => i.index).ThenByDescending(i => i.text))
        {
            testOutput = testOutput.Insert(index, text);
        }
 
        AssertEx.EqualOrDiff(input.OriginalInput, testOutput);
    }
 
    internal static Task<LspDiagnostic[]?> MakeDiagnosticsRequestAsync(
        TextDocument document,
        bool taskListRequest,
        TestHtmlRequestInvoker requestInvoker,
        IIncompatibleProjectService incompatibleProjectService,
        IRemoteServiceInvoker remoteServiceInvoker,
        IClientCapabilitiesService clientCapabilitiesService,
        ILoggerFactory loggerFactory,
        CancellationToken cancellationToken)
    {
        Assert.False(taskListRequest, "Not supported.");
 
        var endpoint = new DocumentPullDiagnosticsEndpoint(incompatibleProjectService, remoteServiceInvoker, requestInvoker, clientCapabilitiesService, NoOpTelemetryReporter.Instance, loggerFactory);
 
        return endpoint.GetTestAccessor().HandleRequestAsync(document, cancellationToken);
    }
}