// storage.js - localStorage helpers

const KEYS = {
	PLAYER_NAME: "gd_playerName",
	LOBBY_NAME: "gd_lobbyName",
	GAME_STATE: "gd_gameState",
	LEADERBOARD: "gd_leaderboard",
};

/**
 * Safely write a value to localStorage.
 * Silently fails if storage quota is exceeded or unavailable.
 * @param {string} key
 * @param {string} value
 */
function setItem(key, value) {
	try {
		localStorage.setItem(key, value);
	} catch {
		console.warn(`Storage: could not write key "${key}"`);
	}
}

/** @param {string} name */
export function savePlayerName(name) {
	setItem(KEYS.PLAYER_NAME, name.trim());
}

/** @returns {string} */
export function getPlayerName() {
	return localStorage.getItem(KEYS.PLAYER_NAME) || "Anonymous";
}

/** @param {string} name */
export function saveLobbyName(name) {
	setItem(KEYS.LOBBY_NAME, name.trim());
}

/** @returns {string} */
export function getLobbyName() {
	return localStorage.getItem(KEYS.LOBBY_NAME) || "My Lobby";
}

/**
 * @param {{ scores: number[], totalScore: number, countries: string[] }} state
 */
export function saveGameState(state) {
	setItem(KEYS.GAME_STATE, JSON.stringify(state));
}

/**
 * @returns {{ scores: number[], totalScore: number, countries: string[] } | null}
 */
export function getGameState() {
	try {
		return JSON.parse(localStorage.getItem(KEYS.GAME_STATE)) || null;
	} catch {
		return null;
	}
}

export function clearGameState() {
	localStorage.removeItem(KEYS.GAME_STATE);
}

/**
 * Add an entry to the local fallback leaderboard and keep the top 20.
 * @param {{ name: string, totalScore: number, scores: number[], date: string }} entry
 */
export function saveLeaderboard(entry) {
	const board = getLeaderboard();
	board.push(entry);
	board.sort((a, b) => b.totalScore - a.totalScore);
	setItem(KEYS.LEADERBOARD, JSON.stringify(board.slice(0, 20)));
}

/**
 * @returns {{ name: string, totalScore: number, scores: number[], date: string }[]}
 */
export function getLeaderboard() {
	try {
		return JSON.parse(localStorage.getItem(KEYS.LEADERBOARD)) || [];
	} catch {
		return [];
	}
}

export function clearLeaderboard() {
	localStorage.removeItem(KEYS.LEADERBOARD);
}