/**
 * File: SpaceshipGenerator.java
 * Author: Brian Borowski
 * Date created: August 1, 2011
 * Date last modified: January 1, 2013
 */
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JPanel;
import javax.swing.Timer;

public class SpaceshipGenerator implements ActionListener {
    private final JPanel parent;
    private final Spaceship[] spaceships;
    private long lastLaunchTime;
    private int sleepMilliseconds;
    private Timer timer;

    public SpaceshipGenerator(final JPanel parent, final Spaceship[] spaceships) {
        this.parent = parent;
        this.spaceships = spaceships;
        sleepMilliseconds = 0;
        timer = new Timer(10, this);
    }

    public void start() {
        for (int i = spaceships.length - 1; i >= 0; --i) {
            spaceships[i] = null;
        }
        resume();
    }

    public void stop() {
        pause();
        for (int i = spaceships.length - 1; i >= 0; --i) {
            spaceships[i] = null;
        }
    }

    public void update(final float elapsedSeconds) {
        for (int i = spaceships.length - 1; i >= 0; --i) {
            if (spaceships[i] != null) {
                spaceships[i].move(elapsedSeconds);
            }
        }
    }

    public void resume() {
        timer.start();
    }

    public void pause() {
        timer.stop();
    }
    
    public void actionPerformed(final ActionEvent ae) {
        final long now = System.currentTimeMillis();
        if (now - lastLaunchTime >= sleepMilliseconds) {
            lastLaunchTime = now;
            sleepMilliseconds = GamePanel.RANDOM_GENERATOR.nextInt(2000);

            final int numToCreate =
                    GamePanel.RANDOM_GENERATOR.nextInt(spaceships.length);
            int numCreated = 0;
            for (int i = spaceships.length - 1; i >= 0; --i) {
                if (spaceships[i] == null) {
                    final int
                        speed = 100 * (GamePanel.RANDOM_GENERATOR.nextInt(2) + 1),
                        pointsEarned = speed / 10,
                        pointsLost = 10 * (1 - (speed/100 - 1) + 1);
                    spaceships[i] =
                        new Spaceship(parent,
                                      50 * (i + 1),
                                      GamePanel.RANDOM_GENERATOR.nextInt(2),
                                      speed,
                                      pointsEarned,
                                      pointsLost
                                      );
                    ++numCreated;
                }
                if (numCreated == numToCreate) {
                    break;
                }
            }
        }        
    }
}