import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;

public class BattleGame extends JFrame {
private GamePanel gamePanel = new GamePanel();

public BattleGame() {
this.setTitle("飞机坦克大战");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(800, 600);
this.add(gamePanel);
this.setVisible(true);
}

public static void main(String[] args) {
new BattleGame();
}
}

class GamePanel extends JPanel implements KeyListener, ActionListener {
private PlayerTank player;
private ArrayList<EnemyPlane> enemies = new ArrayList<>();
private Timer timer;
private boolean[] keys = new boolean[256];

public GamePanel() {
this.setFocusable(true);
this.addKeyListener(this);
player = new PlayerTank(400, 500);
timer = new Timer(16, this);
timer.start();
spawnEnemy();
}

private void spawnEnemy() {
if(enemies.size() < 5) {
enemies.add(new EnemyPlane((int)(Math.random()*700), -50));
}
}

private void updateGame() {
// 玩家移动
if(keys[KeyEvent.VK_LEFT]) player.move(-5, 0);
if(keys[KeyEvent.VK_RIGHT]) player.move(5, 0);
if(keys[KeyEvent.VK_UP]) player.move(0, -5);
if(keys[KeyEvent.VK_DOWN]) player.move(0, 5);
if(keys[KeyEvent.VK_SPACE]) player.fire();

// 敌人更新
for(EnemyPlane enemy : new ArrayList<>(enemies)) {
enemy.update();
if(enemy.y > 600) enemies.remove(enemy);
}

checkCollisions();
spawnEnemy();
repaint();
}

private void checkCollisions() {
// 简单的碰撞检测（这里可以扩展）
}

@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.BLACK);
g.fillRect(0, 0, 800, 600);

// 绘制玩家
player.draw(g);

// 绘制敌人
for(EnemyPlane enemy : enemies) {
enemy.draw(g);
}
}

@Override
public void actionPerformed(ActionEvent e) {
updateGame();
}

@Override
public void keyPressed(KeyEvent e) {
keys[e.getKeyCode()] = true;
}

@Override
public void keyReleased(KeyEvent e) {
keys[e.getKeyCode()] = false;
}

@Override
public void keyTyped(KeyEvent e) {}
}

class PlayerTank {
int x, y;
ArrayList<Bullet> bullets = new ArrayList<>();

public PlayerTank(int x, int y) {
this.x = x;
this.y = y;
}

public void move(int dx, int dy) {
x = Math.max(20, Math.min(760, x + dx));
y = Math.max(400, Math.min(560, y + dy));
}

public void fire() {
if(bullets.size() < 5) {
bullets.add(new Bullet(x + 15, y, -10));
}
}

public void draw(Graphics g) {
g.setColor(Color.GREEN);
g.fillRect(x, y, 40, 30); // 坦克底座
g.fillRect(x+15, y-10, 10, 20); // 炮管
}
}

class EnemyPlane {
int x, y;
public EnemyPlane(int x, int y) {
this.x = x;
this.y = y;
}

public void update() {
y += 3;
x += (int)(Math.random()*5 - 2);
}

public void draw(Graphics g) {
g.setColor(Color.RED);
g.fillOval(x, y, 40, 20); // 飞机主体
}
}

class Bullet {
int x, y;
int speed;

public Bullet(int x, int y, int speed) {
this.x = x;
this.y = y;
this.speed = speed;
}
}