LeaderboardManager.java

import java.io.*;
import java.util.*;

public class LeaderboardManager {

    public static void updateLeaderboard(Player player) {
        String folder = "results";
        new File(folder).mkdirs();
        String fileName = folder + "/leaderboard_" + player.getDifficulty().name().toLowerCase() + ".txt";

        List<String> entries = new ArrayList<>();

        // Load existing leaderboard
        try (BufferedReader br = new BufferedReader(new FileReader(fileName))) {
            String line;
            while ((line = br.readLine()) != null)
                entries.add(line);
        } catch (IOException ignored) {}

        // Add current player
        entries.add(player.getName() + "," + player.getTimeTakenInSeconds());

        // Sort leaderboard by time
        entries.sort(Comparator.comparingLong(e -> Long.parseLong(e.split(",")[1])));

        // Keep only top 5
        while (entries.size() > 5)
            entries.remove(entries.size() - 1);

        // Save updated leaderboard
        try (BufferedWriter bw = new BufferedWriter(new FileWriter(fileName))) {
            for (String entry : entries)
                bw.write(entry + "\n");
        } catch (IOException e) {
            System.out.println("⚠️ Could not update leaderboard.");
        }
    }
}