// Two-line planet labels drawn on the map under each planet (F8-12 /
// issue #55, п.29). The first line shows the planet name when known
// and the `planetNames` toggle is on; the second line shows `#N`. For
// unidentified or unnamed planets only the `#N` line is rendered.
//
// Selection is wired through `selectedPlanetId`: the renderer wraps
// the selected planet's label in an inverse-fill frame (F8-12 / п.30)
// instead of drawing a separate ring around the planet disc — see the
// "label-driven selection" branch in `render.ts`.

import type { GameReport } from "../api/game-state";

export interface PlanetLabelData {
	planetNumber: number;
	x: number;
	y: number;
	/**
	 * The primary line: planet name. `null` when the `planetNames`
	 * toggle is off or the planet has no name (unidentified, or a
	 * legacy report row with an empty string). When null the renderer
	 * only paints the secondary `#N` line.
	 */
	name: string | null;
	/** Secondary line — always present. Pre-formatted as `#N`. */
	numberLabel: string;
}

export interface BuildPlanetLabelsOptions {
	/** Mirrors `MapToggles.planetNames`. */
	showNames: boolean;
}

/**
 * buildPlanetLabels translates the report's planet list into the
 * on-map label dataset. The toggle drives whether the name line is
 * present; for unidentified planets the name is suppressed even when
 * the toggle is on, because the player has no name to display.
 */
export function buildPlanetLabels(
	report: GameReport,
	opts: BuildPlanetLabelsOptions,
): PlanetLabelData[] {
	const out: PlanetLabelData[] = [];
	for (const p of report.planets) {
		const named =
			opts.showNames && p.kind !== "unidentified" && p.name.length > 0;
		out.push({
			planetNumber: p.number,
			x: p.x,
			y: p.y,
			name: named ? p.name : null,
			numberLabel: `#${p.number}`,
		});
	}
	return out;
}