int playerX;
int playerY;
int playerSize = 40;
int bulletSize = 10;
boolean shooting = false;
int bulletX, bulletY;
ArrayList<Alien> aliens;
boolean gameOver = false;

void setup() {
  size(600, 400);
  playerX = width / 2;
  playerY = height - 50;
  aliens = new ArrayList<Alien>();
  for (int i = 0; i < 5; i++) {
    for (int j = 0; j < 3; j++) {
      aliens.add(new Alien(80 + i * 80, 50 + j * 50));
    }
  }
}

void draw() {
  background(0);
  
  if (!gameOver) {
    // Draw player
    fill(0, 255, 0);
    drawPlayer(playerX, playerY);
    
    // Draw and move aliens
    for (Alien a : aliens) {
      a.display();
      a.move();
    }
    
    // Draw and move bullet
    if (shooting) {
      fill(255, 0, 0);
      ellipse(bulletX, bulletY, bulletSize, bulletSize);
      bulletY -= 5;
      if (bulletY < 0) shooting = false;
      
      // Check for collisions
      for (int i = aliens.size() - 1; i >= 0; i--) {
        if (aliens.get(i).hit(bulletX, bulletY)) {
          aliens.remove(i);
          shooting = false;
          break;
        }
      }
    }
    
    // Check if all aliens are destroyed
    if (aliens.isEmpty()) {
      gameOver = true;
    }
  } else {
    fill(255);
    textSize(32);
    textAlign(CENTER, CENTER);
    text("You Win!", width / 2, height / 2);
  }
}

void keyPressed() {
  if (keyCode == LEFT) {
    playerX -= 20;
  } else if (keyCode == RIGHT) {
    playerX += 20;
  } else if (key == ' ' && !shooting) {
    bulletX = playerX + playerSize / 2;
    bulletY = playerY;
    shooting = true;
  }
}

class Alien {
  int x, y;
  int size = 30;
  int speed = 2;
  
  Alien(int x, int y) {
    this.x = x;
    this.y = y;
  }
  
  void display() {
    fill(255, 0, 0); // RED aliens
    drawAlien(x, y);
  }
  
  void move() {
    x += speed;
    if (x > width - size || x < 0) {
      speed *= -1;
      y += 20;
    }
  }
  
  boolean hit(int bx, int by) {
    return bx > x && bx < x + size && by > y && by < y + size;
  }
}

void drawAlien(int x, int y) {
  fill(255, 0, 0); // RED aliens
  rect(x + 5, y, 20, 5);       // Top bar
  rect(x, y + 5, 30, 5);       // Second row
  rect(x, y + 10, 30, 5);      // Third row
  rect(x + 5, y + 15, 20, 5);  // Fourth row
  rect(x, y + 20, 10, 5);      // Left foot
  rect(x + 20, y + 20, 10, 5); // Right foot
}

void drawPlayer(int x, int y) {
  fill(0, 255, 0);
  rect(x + 10, y, 20, 5);      // Top bar
  rect(x, y + 5, 40, 5);       // Second row
  rect(x + 5, y + 10, 30, 5);  // Third row
  rect(x + 15, y + 15, 10, 5); // Cannon barrel
}