using System.Text.RegularExpressions;

namespace AcDream.App.Tests.Physics;

public sealed class Issue270ProductionWiringTests
{
    [Fact]
    public void MovementStats_UseOneEdgeTrackerAndResetItWithTheSession()
    {
        // C3c-F1 (2026-08-02): the #270 invariant is unchanged — exactly one
        // stamina-exhaustion edge tracker, exhaustion dispatched once on the
        // edge, tracker reset with the session — but the wiring moved from
        // the factory's deleted ApplyMovementStats body into
        // LiveMovementStatsApplier, which routes through the Runtime
        // movement owner's typed seam instead of touching the controller.
        string applier = ReadSource("Net", "LiveMovementStatsApplier.cs");
        string factory = ReadSource("Net", "LiveSessionRuntimeFactory.cs");

        Assert.Contains(
            "_staminaExhaustion.Observe(snapshot.CurrentStamina)",
            applier,
            StringComparison.Ordinal);
        Assert.Single(
            Regex.Matches(
                    applier,
                    @"_movement\.ReportExhaustion\(\);")
                .Cast<Match>());
        Assert.Contains(
            "_staminaExhaustion.Reset();",
            applier,
            StringComparison.Ordinal);
        Assert.Contains(
            "_movementStats.Reset();",
            factory,
            StringComparison.Ordinal);
        // The factory keeps zero direct controller mutations: both stat
        // callbacks route through the applier's seam.
        Assert.Equal(
            2,
            Regex.Matches(factory, @"_movementStats\.Apply\(").Count);
        Assert.DoesNotContain(
            "Motion.ReportExhaustion",
            factory,
            StringComparison.Ordinal);
    }

    [Fact]
    public void RemoteSpawnSettle_IsRetriedAndCoversBothCreationRoutes()
    {
        string source = ReadSource(
            "Physics",
            "LiveEntityNetworkUpdateController.cs");

        Assert.Contains(
            "if (!remote.Body.InContact)",
            source,
            StringComparison.Ordinal);
        Assert.Equal(
            3,
            Regex.Matches(source, @"SeedRemoteSpawnPlacement\(").Count);
        // C3c-F5: the settle helper moved to Core (SpawnPlacementSettler) so
        // the local player's Runtime first-entry activation shares the same
        // tested compressed-first-gravity-frame sweep.
        Assert.Contains(
            "SpawnPlacementSettler.TrySettle(",
            source,
            StringComparison.Ordinal);
    }

    private static string ReadSource(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.App",
                    Path.Combine(relativePath)));
            }

            directory = directory.Parent;
        }

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