using System.Text.RegularExpressions;
using Shouldly;
using Xunit;

namespace ZB.MOM.WW.OtOpcUa.AdminUI.Tests.ScriptAnalysis;

/// <summary>
///     Source pins for the Monaco interop (AdminUI has no bUnit and no JS test runner). These do not prove the
///     browser behaviour — the docker-dev live check does — they stop the specific regressions R04:P1/P9/S2/S3 fixed
///     from quietly coming back: per-keystroke text sync, unsequenced diagnostics, the inlay-hints POST, and an
///     unconsumed marker round-trip.
/// </summary>
[Trait("Category", "Unit")]
public sealed class MonacoInteropSourceTests
{
    private static string Read(params string[] relative)
    {
        var dir = new DirectoryInfo(AppContext.BaseDirectory);
        while (dir is not null && !File.Exists(Path.Combine(dir.FullName, "ZB.MOM.WW.OtOpcUa.slnx")))
            dir = dir.Parent;
        dir.ShouldNotBeNull("could not locate the repository root");
        return File.ReadAllText(Path.Combine(new[] { dir!.FullName, "src", "Server", "ZB.MOM.WW.OtOpcUa.AdminUI" }.Concat(relative).ToArray()));
    }

    private static string Js() => Read("wwwroot", "js", "monaco-init.js");

    [Fact]
    public void The_content_change_handler_does_not_ship_the_text_to_dotnet()
    {
        var js = Js();
        var handler = Regex.Match(js, @"onDidChangeModelContent\(function \(\) \{(?<body>.*?)\n        \}\);", RegexOptions.Singleline);
        handler.Success.ShouldBeTrue("the content-change handler moved; update this pin");
        handler.Groups["body"].Value.ShouldNotContain("OnValueChanged");
        handler.Groups["body"].Value.ShouldNotContain("getValue");
        // Positive control: the text IS still reported — at blur.
        js.ShouldContain("onDidBlurEditorText");
        js.ShouldContain("\"OnValueChanged\"");
    }

    [Fact]
    public void Diagnostics_are_generation_guarded_and_abortable()
    {
        var js = Js();
        js.ShouldContain("diagGeneration");
        js.ShouldContain("generation !== e.diagGeneration");
        js.ShouldContain("new AbortController()");
        js.ShouldContain("signal: signal");
    }

    [Fact]
    public void Providers_honour_the_monaco_cancellation_token()
    {
        var js = Js();
        js.ShouldContain("token.onCancellationRequested");
        foreach (var path in new[] { "\"completions\"", "\"hover\"", "\"format\"", "\"signature-help\"" })
            js.ShouldContain("postAnalysis(" + path);
    }

    [Fact]
    public void The_inlay_hints_provider_is_not_registered() => Js().ShouldNotContain("registerInlayHintsProvider");

    [Fact]
    public void Markers_cross_to_dotnet_only_for_a_subscribed_problems_list()
    {
        Js().ShouldContain("if (e.reportMarkers) {");
        Read("Components", "Shared", "MonacoEditor.razor").ShouldContain("reportMarkers = MarkersChanged.HasDelegate");
    }

    [Fact]
    public void The_markers_report_is_capped_before_it_crosses_the_circuit()
    {
        // Review I-1: the only OnMarkersChanged invoke sends the capped report, never the raw marker array.
        var js = Js();
        Regex.Matches(js, "\"OnMarkersChanged\"").Count.ShouldBe(1);
        js.ShouldContain("dotNetRef.invokeMethodAsync(\"OnMarkersChanged\", report.markers, report.total)");
        js.ShouldContain("const report = markerReport(e, markers);");
        js.ShouldContain(".slice(0, max)");
        js.ShouldContain("m.message.substring(0, maxChars - 1)");
        // The caps come from the C# constants, so the JS and ScriptProblemReport.FromEditor agree.
        var razor = Read("Components", "Shared", "MonacoEditor.razor");
        razor.ShouldContain("maxReportedMarkers = ScriptEditorLimits.MaxReportedMarkers");
        razor.ShouldContain("maxReportedMessageChars = ScriptEditorLimits.MaxReportedMessageChars");
        razor.ShouldContain("ScriptProblemReport.FromEditor(markers, total)");
    }

    [Fact]
    public void An_oversize_text_is_announced_at_blur_not_only_at_save()
    {
        Js().ShouldContain("invokeMethodAsync(\"OnSyncRefused\", serializedBytes(v))");
        Read("Components", "Shared", "MonacoEditor.razor").ShouldContain("public void OnSyncRefused(int bytes)");
    }

    [Theory]
    [InlineData("Components", "Pages", "ScriptEdit.razor")]
    [InlineData("Components", "Shared", "Uns", "VirtualTagModal.razor")]
    public void Script_hosts_read_the_editor_on_save_and_render_the_problems_list(params string[] path)
    {
        var src = Read(path);
        src.ShouldContain("GetValueAsync()");
        src.ShouldContain("<ScriptProblemsList");
        src.ShouldContain("RevealLineAsync(");
        src.ShouldContain("MarkersChanged=");
    }
}