using System.Globalization;

namespace AcDream.Core.Rendering;

/// <summary>Permanent rendering diagnostics and retail render-route helpers.</summary>
public static class RenderingDiagnostics
{
    /// <summary>
    /// #176 stripe-hunt shader isolation mode. Zero disables the override;
    /// values 1-3 retain the established lighting diagnostic modes.
    /// </summary>
    public static int LightDebugMode { get; set; } =
        int.TryParse(
            Environment.GetEnvironmentVariable("ACDREAM_LIGHT_DEBUG"),
            NumberStyles.Integer,
            CultureInfo.InvariantCulture,
            out int mode)
            ? mode
            : 0;

    /// <summary>Returns true for AC indoor EnvCell ids.</summary>
    public static bool IsEnvCellId(ulong id) => (id & 0xFFFFu) >= 0x0100u;

    /// <summary>
    /// Retail chooses the indoor path from the player's cell, provided the
    /// transition-owned render root is available.
    /// </summary>
    public static bool ShouldRenderIndoor(uint playerCellId, bool renderRootResolved)
        => renderRootResolved && IsEnvCellId(playerCellId);

    /// <summary>Permanent frame-profiler toggle.</summary>
    public static bool FrameProfEnabled { get; set; } =
        Environment.GetEnvironmentVariable("ACDREAM_FRAME_PROF") == "1";

    /// <summary>Optional per-frame CSV history path for the frame profiler.</summary>
    public static string? FrameHistoryPath { get; } =
        Environment.GetEnvironmentVariable("ACDREAM_FRAME_HISTORY");

    /// <summary>
    /// Print-only production walk transcript gate. RuntimeOptions owns the
    /// sole environment read and assigns this property during construction.
    /// </summary>
    public static bool DumpWalkTranscriptEnabled { get; set; }
}