package com.bulma.inc;

import java.util.*;
import java.util.concurrent.ThreadLocalRandom;

/**
 * BulmaLocator is responsible for locating the 7 Dragon Balls.
 * Each Dragon Ball has a random geographical position represented by latitude and longitude.
 * There is a 1/10 chance that a Dragon Ball cannot be located.
 */
public class BulmaLocator {

    /**
     * Retrieves the positions of the 7 Dragon Balls.
     *
     * @return a list of positions where each position is a list containing latitude and longitude.
     *         If a Dragon Ball is not located, the corresponding position will be null.
     */
    public List<List<Integer>> locateAll() throws InterruptedException {
        List<List<Integer>> dragonBallList = new ArrayList<>();
        for (int id = 1; id <= 7; id++) {
            dragonBallList.add(locate(id));
        }
        return dragonBallList;
    }

    /**
     * Generates a random geographical position for a Dragon Ball.
     *
     * @return a list containing latitude and longitude, or null if the Dragon Ball is not located.
     */
    private List<Integer> locate(int dragonballId) throws InterruptedException {
        Thread.sleep(100L*dragonballId);
        // 1/10 chance the Dragon Ball is not located
        if (ThreadLocalRandom.current().nextInt(10) == 0) {
            return null;
        }
        int latitude = ThreadLocalRandom.current().nextInt(-90, 91); // Latitude range: -90 to 90
        int longitude = ThreadLocalRandom.current().nextInt(-180, 181); // Longitude range: -180 to 180
        return List.of(latitude, longitude);
    }

    /**
     * Main method to execute the BulmaLocator and display the positions of the Dragon Balls.
     *
     * @param args command-line arguments (not used).
     */
    public static void main(String[] args) throws InterruptedException {
        BulmaLocator locator = new BulmaLocator();
        List<List<Integer>> dragonBallPositions = locator.locateAll();

        // Print the positions of the Dragon Balls
        for (int i = 0; i < 6; i++) {
            List<Integer> position = dragonBallPositions.get(i);
            if (position == null) {
                System.out.println("Dragon Ball " + (i + 1) + ": Not located");
            } else {
                System.out.println("Dragon Ball " + (i + 1) + ": Latitude = " + position.get(0) + ", Longitude = " + position.get(1));
            }
        }
    }
}