#pragma once

#include "CoreMinimal.h"

/**
 * Constants of the carrier CANTICLE (DESIGN_UE.md section 3; v2 06_carrier.js). All distances are CARRIER-LOCAL METRES
 * (+X bow, +Y starboard, +Z up) unless the name says otherwise. One header per namespace (Core/Tuning/README.md).
 */
namespace Descent::Tune::Carrier
{
	// ---- hull (section 3.3) -------------------------------------------------------------------------------------
	constexpr double HullRadiusM = 12.0;            // v2 C_R: radius of the cylindrical middle, |x| <= 40
	constexpr double HullCylinderHalfLengthM = 40.0;
	constexpr double HullHalfLengthM = 60.0;        // nose at x = +60, stern cap at x = -60
	constexpr double HullSternRadiusM = 7.0;        // radius at x = -60 (12 - 5)
	constexpr double DryHullMarginM = 0.3;          // IsDry: hypot(y, z) < HullRadius(x) - 0.3

	// ---- decks and rooms (section 3.3) --------------------------------------------------------------------------
	constexpr double DeckFloorZ1 = -7.5;            // D1: only the sub bay
	constexpr double DeckFloorZ2 = -3.0;            // D2
	constexpr double DeckFloorZ3 = 1.5;             // D3
	constexpr double RoomHeightM = 4.2;
	constexpr double TallRoomHeightM = 8.7;         // stairwell and sub bay
	constexpr double DoorHeightM = 2.4;
	constexpr double WallThicknessM = 0.16;         // each room builds its own four walls, inset by half of this (v2)
	constexpr double FloorSlabM = 0.2;
	constexpr double CeilingSlabM = 0.1;
	constexpr double EyeHeightM = 1.65;

	// ---- moon pool (section 3.3) --------------------------------------------------------------------------------
	constexpr double PoolX0 = -35.0;
	constexpr double PoolX1 = -23.0;
	constexpr double PoolY0 = 3.5;
	constexpr double PoolY1 = 8.5;
	constexpr double PoolWaterZ = -8.3;
	constexpr double PoolShaftBottomZ = -11.6;

	// ---- start pose (section 1.5) -------------------------------------------------------------------------------
	constexpr double StartZM = -30.0;               // world Z of the carrier origin at the start
	constexpr double StreamFocusRadiusM = 120.0;    // the carrier keeps the world loaded around it (section 1.5 step 4)

	// ---- render channels (sections 3.2 and 7.4) -----------------------------------------------------------------
	constexpr int32 InteriorStencilValue = 1;       // "dry": PP_Water leaves these pixels alone
	// Lighting channels: sea = 0, carrier interior = 1.
	constexpr uint8 ChannelSea = 0;
	constexpr uint8 ChannelInterior = 1;
	/** The trace channel "Placement" (section 3.2) is ECC_GameTraceChannel1; the project config does not name it yet (see Docs/status/carrier.md). */
	constexpr int32 PlacementTraceChannelIndex = 1;

	// ---- lights (sections 3.3 and 7.5) --------------------------------------------------------------------------
	constexpr double LampRadiusM = 11.0;            // room lamps; tall rooms use TallLampRadiusM
	constexpr double TallLampRadiusM = 16.0;
	constexpr float LampFalloffExponent = 3.0f;     // attenuation (1 - (d/R)^2)^3, no inverse-square (section 7.5)
	constexpr float LampSourceRadiusCm = 12.f;
	/**
	 * Design intensities are unitless ("1.3" for the bridge); brightness = intensity * this. With bUseInverseSquaredFalloff = false the
	 * engine uses the value as it is (no unit conversion). Integration pass (Docs/status/integ.md): the carrier track had calibrated 2700
	 * against a scenario-only exposure (bias 1.0 WITH the physical camera exposure, about 1/1146 per unit); the game's one authority,
	 * ADescentEnvironment, uses a manual exposure without the physical camera, at descent.Look.ExposureEV (about 1.0 per unit), so the
	 * three numbers (this, EMISSIVE_NITS and AMBIENT_NITS in assets_35_carrier_materials.py) were multiplied by the same factor
	 * InteriorExposureFactor and then trimmed by the m2_walk room shots. Console variable descent.Carrier.LampScale scales it live.
	 */
	constexpr float LampBrightnessUnit = 4.6f;
	/** The factor all three interior brightness numbers were scaled by when the exposure authority moved to ADescentEnvironment. */
	constexpr float InteriorExposureFactor = 0.0017f;

	// Exterior lights (V4a): exactly six, nothing else.
	constexpr int32 ExteriorLightCount = 6;
	constexpr double NavRedX = 24.0, NavRedY = -12.1, NavRedZ = 0.5;
	constexpr double NavGreenX = 24.0, NavGreenY = 12.1, NavGreenZ = 0.5;
	constexpr double MastX = 8.0, MastY = 0.0, MastZ = 22.9;
	constexpr double MastFlashOnSec = 0.12, MastFlashPeriodSec = 2.2;
	constexpr double SternX = -60.5, SternY = 0.0, SternZ = 2.0;
	constexpr double FloodX = 46.0, FloodY = 0.0, FloodZ = -9.2;
	constexpr double FloodAimX = 130.0, FloodAimY = 0.0, FloodAimZ = -30.0;
	constexpr double PoolGlowX = -29.0, PoolGlowY = 6.0, PoolGlowZ = -12.0;
	constexpr double NavRadiusM = 9.0;
	constexpr double FloodRadiusM = 160.0;
	constexpr double FloodInnerConeDeg = 13.0, FloodOuterConeDeg = 24.0;
	constexpr double PoolGlowRadiusM = 20.0;
	constexpr float NavIntensity = 0.4f, FloodIntensity = 5.0f, PoolGlowIntensity = 1.4f;

	// ---- the walking-on-a-moving-vessel proof (R2, section 11): the carrier's design maxima -----------------------
	constexpr double MaxSpeedMps = 2.0;             // U9
	constexpr double MaxYawRateRadPerSec = 0.10;    // section 3.6: omega_target clamp
	constexpr double MaxPitchDeg = 10.0;            // hard limit of the helm
	constexpr double PitchResponseSec = 2.5;        // section 3.6: first-order response of the pitch
	constexpr double RollPerYawRateRad = -0.25;     // section 3.6: roll = -0.25 * omega (cosmetic)

	// ---- cosmetics ----------------------------------------------------------------------------------------------
	constexpr double EngineLampPulseHz = 2.4 / (2.0 * UE_DOUBLE_PI);  // 1 + sin(2.4 t) pulse of the engine room lamps
}