using System.Text.RegularExpressions;

namespace AcDream.App.Tests.World;

/// <summary>
/// C3c-R1 F3 (coordinator resolution, 2026-08-02): the create-authority
/// drift probes in the expectation-item 6/8 tests
/// (LiveEntityHydrationControllerTests + LiveEntityCreateSupersessionRecoveryTests)
/// hand-call <c>record.Canonical.AdvanceCreateAuthority()</c> as an HONEST
/// MODEL of the executor drain's advance — the SOLE remaining production
/// site that advances create authority for an existing incarnation. A
/// nested production OnCreate can no longer produce that drift:
/// post-residence ExistingGeneration registration is description-only
/// (RuntimeEntityObjectLifetime gates the advance on
/// <c>!beginInitialResidence</c>) and <c>ConsumeExecuted</c> removes the
/// completed residence entry at Released, closing the FIFO-adoption path
/// (empirically confirmed: the restored nested-OnCreate probe produced no
/// drift and no CreateSupersessionRecovery). This pin flags the model as
/// STALE if the production site ever moves or loses the advance — the
/// item 6/8 probes must be re-derived from wherever it goes.
/// </summary>
public sealed class C3cR1F3DriftModelSourcePinTests
{
    [Fact]
    public void HandCalledDriftProbe_StillModelsTheExecutorDrainAdvance()
    {
        string executor = ReadRuntimeSource(
            "Entities",
            "RuntimeInitialCreateContinuationExecutor.cs");

        // Exactly one production advance, and it lives inside the
        // WeenieDescription drain stage the probes model.
        Assert.Single(
            Regex.Matches(executor, @"_entities\.AdvanceCreateAuthority\(")
                .Cast<Match>());
        Assert.Matches(
            new Regex(
                @"private bool ApplyWeenieDescriptionAction[\s\S]{0,6000}?"
                + @"_entities\.AdvanceCreateAuthority\(canonical\);"),
            executor);

        // The registration-time advance stays gated OFF the residence
        // route — the reason a nested production OnCreate cannot reach the
        // modeled drift.
        string lifetime = ReadRuntimeSource(
            "Entities",
            "RuntimeEntityObjectLifetime.cs");
        Assert.Matches(
            new Regex(
                @"if \(!beginInitialResidence\)\s*"
                + @"Entities\.AdvanceCreateAuthority\(retained\);"),
            lifetime);
    }

    private static string ReadRuntimeSource(params string[] relativePath)
    {
        DirectoryInfo? directory = new(AppContext.BaseDirectory);
        while (directory is not null)
        {
            if (File.Exists(Path.Combine(directory.FullName, "AcDream.slnx")))
            {
                return File.ReadAllText(Path.Combine(
                    directory.FullName,
                    "src",
                    "AcDream.Runtime",
                    Path.Combine(relativePath)));
            }

            directory = directory.Parent;
        }

        throw new DirectoryNotFoundException("Could not find AcDream.slnx.");
    }
}