using System.Text.Json;
using AcDream.App.Diagnostics;
using AcDream.App.Streaming;
using SixLabors.ImageSharp;

namespace AcDream.App.Tests.Diagnostics;

public sealed class WorldLifecycleAutomationControllerTests
{
    [Fact]
    public void ScreenshotCapture_FlipsGlRowsAndWritesACompletePng()
    {
        string directory = NewDirectory();
        // GL order: bottom row red/green, top row blue/white.
        byte[] rgba =
        [
            255, 0, 0, 255, 0, 255, 0, 255,
            0, 0, 255, 255, 255, 255, 255, 255,
        ];
        var logs = new List<string>();
        var controller = new FrameScreenshotController(
            () => (2, 2),
            (_, _) => rgba,
            directory,
            logs.Add);

        try
        {
            Assert.True(controller.TryRequest("login_stable", out string error), error);
            Assert.False(controller.IsComplete("login_stable"));

            controller.CapturePending();

            Assert.True(controller.IsComplete("login_stable"));
            string path = Path.Combine(directory, "login_stable.png");
            using Image image = Image.Load(path);
            Assert.Equal(2, image.Width);
            Assert.Equal(2, image.Height);
            Assert.Contains(logs, line => line.Contains("screenshot-complete", StringComparison.Ordinal));

            byte[] flipped = FrameScreenshotController.FlipRows(rgba, 2, 2);
            Assert.Equal(rgba.AsSpan(8, 8).ToArray(), flipped.AsSpan(0, 8).ToArray());
            Assert.Equal(rgba.AsSpan(0, 8).ToArray(), flipped.AsSpan(8, 8).ToArray());
        }
        finally
        {
            Directory.Delete(directory, recursive: true);
        }
    }

    [Theory]
    [InlineData("")]
    [InlineData("../escape")]
    [InlineData("has spaces")]
    [InlineData("name.png")]
    public void ArtifactNames_RejectPathsAndAmbiguousCharacters(string name)
    {
        Assert.False(AutomationArtifactName.TryValidate(name, out string error));
        Assert.NotEmpty(error);
    }

    [Fact]
    public void Checkpoint_WritesCanonicalRevealAndResourceSnapshot()
    {
        string directory = NewDirectory();
        var reveal = new WorldRevealLifecycleSnapshot(
            Generation: 7,
            Kind: WorldRevealKind.Portal,
            Readiness: new WorldRevealReadinessSnapshot(
                0x8A020164u,
                IsIndoor: true,
                IsUnhydratable: false,
                RequiredRenderRadius: 0,
                IsRenderNeighborhoodReady: true,
                AreCompositeTexturesReady: true,
                IsCollisionReady: true),
            Materialized: true,
            Completed: true,
            Cancelled: false,
            WorldViewportObserved: true,
            InvariantFailureCount: 0);
        var resources = EmptyResources() with
        {
            LoadedLandblocks = 1,
            WorldEntities = 42,
            TrackedGpuBytes = 1234,
        };
        var screenshots = new FrameScreenshotController(
            () => (1, 1),
            (_, _) => [0, 0, 0, 255],
            Path.Combine(directory, "screenshots"));
        var controller = new WorldLifecycleAutomationController(
            () => reveal,
            () => 3,
            () => resources,
            screenshots,
            directory);

        try
        {
            Assert.True(controller.IsWorldReady);
            Assert.True(controller.IsWorldViewportVisible);
            Assert.Equal(3, controller.PortalMaterializationCount);
            Assert.True(controller.TryWriteCheckpoint("dungeon", out string error), error);

            string line = Assert.Single(File.ReadAllLines(
                Path.Combine(directory, "world-lifecycle.checkpoints.jsonl")));
            using JsonDocument json = JsonDocument.Parse(line);
            Assert.Equal("dungeon", json.RootElement.GetProperty("name").GetString());
            Assert.Equal(7, json.RootElement.GetProperty("reveal").GetProperty("generation").GetInt64());
            Assert.Equal(42, json.RootElement.GetProperty("resources").GetProperty("worldEntities").GetInt32());
            Assert.True(File.Exists(Path.Combine(directory, "checkpoint-dungeon.json")));
        }
        finally
        {
            Directory.Delete(directory, recursive: true);
        }
    }

    private static WorldLifecycleResourceSnapshot EmptyResources() => new(
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0L, 0, 0L, 0L, 0, 0, 0, 0, 0, 0, 0, 0L, 0L, 0d, 0d, null);

    private static string NewDirectory()
    {
        string path = Path.Combine(Path.GetTempPath(), "acdream-world-gate-" + Guid.NewGuid().ToString("N"));
        Directory.CreateDirectory(path);
        return path;
    }
}