export interface FleetRect { x: number; y: number; width: number; height: number }

export interface FleetLayout {
	width: number;
	rows: number;
	bodyHeight: number;
	roster: FleetRect;
	output: FleetRect;
	rosterStart: number;
	rosterKeys: string[];
}

/** Coordinates are overlay-local, matching Pi's normalized input contract. */
export function fleetLayout(width: number, rows: number, selected: number, items: readonly { key: string }[]): FleetLayout | undefined {
	if (width < 36) return undefined;
	const bodyHeight = Math.max(2, Math.floor(rows * 0.85) - 6);
	const rosterWidth = Math.max(22, Math.min(46, Math.floor((width - 3) * 0.38)));
	const rosterStart = Math.max(0, Math.min(selected - bodyHeight + 1, Math.max(0, items.length - bodyHeight)));
	return {
		width, rows, bodyHeight, rosterStart,
		roster: { x: 1, y: 3, width: rosterWidth, height: bodyHeight },
		output: { x: rosterWidth + 2, y: 3, width: Math.max(1, width - rosterWidth - 3), height: bodyHeight },
		rosterKeys: items.slice(rosterStart, rosterStart + bodyHeight).map((item) => item.key),
	};
}

export function fleetContains(rect: FleetRect, x: number, y: number): boolean {
	return x >= rect.x && x < rect.x + rect.width && y >= rect.y && y < rect.y + rect.height;
}