#pragma once

#include "CoreMinimal.h"

/**
 * Constants of the user interface (UI/ folder; DESIGN_UE.md section 8.5, requirement V13).
 * Every size is in UI units. One UI unit is one pixel of the viewport at 1080p and below; above 1080p the whole UI is
 * scaled up (UiScaleForViewport) so a 4K screen shows the 1080p layout, not a tiny one. Colours live in UI/NeuStyle.cpp
 * (they are not constexpr), everything else lives here.
 */
namespace Descent::Tune::UI
{
	// ---- scale ----------------------------------------------------------------------------------------------------
	/** Short side of the viewport at which one UI unit equals one pixel; larger screens scale up from there. */
	constexpr float ReferenceShortSidePx = 1080.f;
	/** Viewport width under which the HUD uses its narrow rules (section 8.5: gauges 56 px, radio under the depth panel...). */
	constexpr float NarrowWidthPx = 900.f;
	/** Viewport height under which the HUD uses compact heights. */
	constexpr float CompactHeightPx = 640.f;

	// ---- neumorphic style (section 8.5) ---------------------------------------------------------------------------
	constexpr float CornerRadiusPx = 16.f;
	/** Soft shadow: dark one at (+Soft, +Soft), light one at (-SoftLight, -SoftLight), blur sigma in px. */
	constexpr float ShadowSoftSigmaPx = 7.f;
	constexpr float ShadowSoftDarkOffsetPx = 6.f;
	constexpr float ShadowSoftLightOffsetPx = 5.f;
	/** Small shadow, for slots, buttons and anything under ~60 px. */
	constexpr float ShadowSmallSigmaPx = 3.5f;
	constexpr float ShadowSmallDarkOffsetPx = 3.f;
	constexpr float ShadowSmallLightOffsetPx = 3.f;
	/** How far out the blur is generated: this many sigmas. Beyond it the alpha is below 0.2 percent. */
	constexpr float ShadowReachSigmas = 3.f;
	/** Strength of the two shadows (alpha multiplier) and of the body's top-to-bottom gradient (fraction of the colour). */
	constexpr float ShadowDarkStrength = 1.0f;
	constexpr float ShadowLightStrength = 1.0f;
	constexpr float BodyGradient = 0.045f;
	/** Disabled widgets are drawn at this opacity (section 8.5: 35 percent). */
	constexpr float DisabledOpacity = 0.35f;
	/** Cap on cached exact-size shadow textures before the cache is flushed (they are small). */
	constexpr int32 ShadowCacheLimit = 192;

	// ---- widget sizes ---------------------------------------------------------------------------------------------
	constexpr float HotbarSlotPx = 52.f;
	constexpr float InventoryCellPx = 74.f;
	constexpr float RowIconPx = 40.f;
	constexpr float ButtonHeightPx = 38.f;
	constexpr float SliderTrackPx = 12.f;
	constexpr float SliderThumbPx = 26.f;
	constexpr float ProgressHeightPx = 14.f;

	// ---- HUD (section 8.5 layout table) ---------------------------------------------------------------------------
	constexpr float HudMarginPx = 14.f;
	constexpr float HudGaugeWidePx = 72.f;
	constexpr float HudGaugeNarrowPx = 56.f;
	constexpr float HudObjectiveMaxFraction = 0.30f;
	constexpr float HudObjectiveMinWidthPx = 190.f;
	constexpr float HudObjectiveFoldedHeightPx = 30.f;
	constexpr float HudToastHeightPx = 34.f;
	constexpr float HudToastGapPx = 6.f;
	constexpr float HudToastWidthPx = 300.f;
	constexpr float HudRadioMaxWidthPx = 560.f;
	constexpr float HudRadioHeightPx = 32.f;
	constexpr float HudRadioGapPx = 16.f;
	constexpr float HudPromptHeightPx = 32.f;
	constexpr float HudPromptMaxWidthPx = 380.f;
	constexpr float HudPromptOffsetPx = 30.f;
	constexpr float HudProximityWidthPx = 168.f;
	constexpr float HudProximityRowPx = 24.f;
	constexpr float HudWarningHeightPx = 30.f;
	/** Seconds a toast spends fading out at the end of its life. */
	constexpr float HudToastFadeSec = 0.6f;

	// ---- windows (section 8.5) ------------------------------------------------------------------------------------
	constexpr float WindowMaxWidthPx = 980.f;
	constexpr float WindowMaxHeightPx = 640.f;
	constexpr float WindowScreenMarginPx = 10.f;
	constexpr float WindowHeaderHeightPx = 56.f;
	/** The scrim drawn over the game while a window is open. */
	constexpr float WindowScrimAlpha = 0.55f;

	// ---- dashboards (section 4.6) ---------------------------------------------------------------------------------
	constexpr float DashDrawWidthPx = 1024.f;
	constexpr float DashDrawHeightPx = 420.f;
	constexpr float CargoDrawSizePx = 512.f;
	constexpr int32 CargoColumns = 4;
	/** A new chunk drops into the hold over this long. */
	constexpr float CargoDropSec = 0.3f;
	/** The dashboards redraw this often (section 1.4: dashboards at 8 Hz), and at once when the rounded depth changes. */
	constexpr float DashRedrawHz = 8.f;
	/** Hull and power colours go red below these (section 4.6). */
	constexpr float DashHullRedPct = 30.f;
	constexpr float DashPowerRedPct = 20.f;
	/** Depth bar range in metres (section 4.6: between 1,740 and 3,400 m). */
	constexpr double DashDepthBarMinM = 1740.0;
	constexpr double DashDepthBarMaxM = 3400.0;

	// ---- pause window ---------------------------------------------------------------------------------------------
	/** The console variable the Bloom slider is bound to (created by the look track). */
	inline const TCHAR* BloomCVarName() { return TEXT("descent.Look.Bloom"); }
	/** The slider spans 0..this; a variable whose value is larger than this widens the span. */
	constexpr float BloomSliderMax = 1.0f;

	/** UI scale for a viewport (see the file comment): 1 up to the reference, then proportional to the short side. */
	inline float UiScaleForViewport(float WidthPx, float HeightPx)
	{
		const float Short = FMath::Min(WidthPx, HeightPx);
		return FMath::Max(1.f, Short / ReferenceShortSidePx);
	}
}