package game;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class BirdGame extends JPanel{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	BufferedImage background;
	BufferedImage startImage;
	BufferedImage gameOverImage;
	Ground ground;
	Column column1,column2;
	Bird bird;
	//初始化分数
	int score;
	//初始化状态
	int state;
	public static final int START=0;//开始
	public static final int RUNNING=1;//运行
	public static final int GAME_OVER=2;//状态
	public BirdGame() throws Exception{
		//初始化背景图片
		background=ImageIO.read(getClass().getResource("/resources/bg.png"));
		startImage=ImageIO.read(getClass().getResource("/resources/start.png"));
		gameOverImage=ImageIO.read(getClass().getResource("/resources/gameover.png"));
		//初始化地面
		ground = new Ground();
		//初始化柱子
		column1 = new Column(1);
		column2 = new Column(2);
		//初始化小鸟
		bird = new Bird();

		// 初始化分数
		score = 0;

		// 初始化状态
		state = START;

	}
	public void paint(Graphics g) {
		// 绘制背景
		g.drawImage(background, 0, 0, null);
		// 绘制地面
		g.drawImage(ground.image, ground.x, ground.y, null);

		// 绘制柱子
		g.drawImage(column1.image, column1.x - column1.width / 2, column1.y - column1.height / 2, null);
		g.drawImage(column2.image, column2.x - column2.width / 2, column2.y - column2.height / 2, null);

		// 绘制小鸟（旋转坐标系）
		Graphics2D g2 = (Graphics2D) g;
		g2.rotate(-bird.alpha, bird.x, bird.y);
		g.drawImage(bird.image, bird.x - bird.width / 2, bird.y - bird.height / 2, null);
		g2.rotate(bird.alpha, bird.x, bird.y);

		// 绘制分数
		//Font字体类
		Font f = new Font(Font.SANS_SERIF, Font.BOLD, 40);
		g.setFont(f);
		g.drawString("" + score, 40, 60);
		g.setColor(Color.WHITE);
		g.drawString("" + score, 40 - 3, 60 - 3);

		// 绘制开始与结束界面
		switch (state) {
		case START:
			g.drawImage(startImage, 0, 0, null);
			break;
		case GAME_OVER:
			g.drawImage(gameOverImage, 0, 0, null);
			break;
		}
	}

	// 开始游戏
	public void action() throws Exception {
		//鼠标监听器MouseListener
		//添加鼠标事件的时候,用适配器mouseAdapter可以不用实现所有的方法。只需要写自己需要的方法即可 
		MouseListener l = new MouseAdapter() {
			// 鼠标按下事件
			public void mousePressed(MouseEvent e) {
				try {
					switch (state) {
					case START:
						// 在开始状态，按下鼠标则转为运行状态。
						state = RUNNING;
						break;
					case RUNNING:
						// 在运行状态，按下鼠标则小鸟向上飞行。
						bird.flappy();
						break;
					case GAME_OVER:
						// 在结束状态，按下鼠标则重置数据，再次转为开始态。
						column1 = new Column(1);
						column2 = new Column(2);
						bird = new Bird();
						score = 0;
						state = START;
						break;
					}
				} catch (Exception ex) {
					ex.printStackTrace();
				}
			}
		};

		// 将***添加到当前的面板上
		addMouseListener(l);
		// 不断的移动与重绘
		while (true) {
			switch (state) {
			case START:
				// 小鸟做出飞行动作
				bird.fly();
				// 地面向左移动一步
				ground.step();
				break;
			case RUNNING:
				// 地面向左移动一步
				ground.step();
				// 柱子向左移动一步
				column1.step();
				column2.step();
				// 小鸟做出飞行动作
				bird.fly();
				// 小鸟上下移动一步
				bird.step();
				// 计算分数
				if (bird.x == column1.x || bird.x == column2.x) {
					score++;
				}
				// 检测是否发生碰撞
				if (bird.hit(ground) || bird.hit(column1) || bird.hit(column2)) {
					state = GAME_OVER;
				}
				break;
			}
			// 重新绘制界面
			repaint();
			// 休眠 1000/60 毫秒
			Thread.sleep(1000 / 60);
		}

	}

	/**
	 * 启动方法
	 */
	public static void main(String[] args) throws Exception {
		//JFrame类编程窗口，类似一个容器
		JFrame frame = new JFrame();
		BirdGame game = new BirdGame();
		frame.add(game);
		frame.setTitle("FlyBird");
		frame.setSize(440, 670);//设置窗体尺寸大小
		frame.setLocationRelativeTo(null);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);//可视化
		game.action();//程序主入口，由此进入

	}
}