#pragma once

#include "CoreMinimal.h"
#include "UI/DescentHudModel.h"

/** One rectangle of the HUD, in UI units (origin top left). */
struct THEDESCENT_API FDescentHudRect
{
	FName Name;
	float X = 0.f;
	float Y = 0.f;
	float W = 0.f;
	float H = 0.f;
	bool bVisible = false;

	float Right() const { return X + W; }
	float Bottom() const { return Y + H; }
	bool Intersects(const FDescentHudRect& O) const { return X < O.Right() && O.X < Right() && Y < O.Bottom() && O.Y < Bottom(); }
	bool InsideSize(const FVector2f& Size) const { return X >= 0.f && Y >= 0.f && Right() <= Size.X && Bottom() <= Size.Y; }
};

/**
 * Where every region of the HUD sits (DESIGN_UE.md section 8.5 layout table and its narrow-screen rule). A pure function
 * of the layout size (UI units) and the HUD model, so a headless test can check that radio, prompt, vitals, hotbar, vehicle
 * panel, objective and depth panel never intersect at 1280 x 720, 1000 x 560 and 800 x 450, and the scenarios report the
 * same rectangles in `ui.widgets`.
 *
 *   narrow  (width < 900):   gauges 56, radio moves under the depth panel, objective hidden unless unfolded (J)
 *   compact (height < 640):  shorter depth panel, objective and proximity rows
 */
struct THEDESCENT_API FDescentHudLayout
{
	FVector2f Size = FVector2f(1280.f, 720.f);
	bool bNarrow = false;
	bool bCompact = false;
	float Gauge = 72.f;
	float Slot = 52.f;

	FDescentHudRect Depth, Objective, Toasts, Vitals, Vehicle, Hotbar, Radio, Prompt, BuildReason, Proximity, Warning;

	static FDescentHudLayout Compute(const FVector2f& LayoutSize, const FDescentHudModel& Model);

	/** All regions, visible or not, in a fixed order. */
	TArray<const FDescentHudRect*> All() const;

	/** The ones a test must keep apart: radio, prompt, vitals, hotbar, vehicle, objective, depth (+ toasts, proximity, warning, build reason). */
	TArray<const FDescentHudRect*> VisibleRects() const;

	/** The first pair of visible regions that overlap, or false. */
	bool FindOverlap(FName& OutA, FName& OutB) const;
};