import java.applet.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class Calculate24 extends Applet implements ActionListener
{
	Panel pnlBottom;
	MyImgPanel pnlCenter;
	TextField txtField;
	
	int[] myStatus=new int[4];
	
	public Calculate24()
	{
		setLayout(new BorderLayout());
		pnlCenter=new MyImgPanel(this);
		pnlCenter.initImg();
		add(pnlCenter,BorderLayout.CENTER);
		pnlBottom=new Panel();
		add(pnlBottom,BorderLayout.SOUTH);
		Button btnStart=new Button("開始游戲");
		Button btnOk=new Button("確定");
		txtField=new TextField(15);
		Label label=new Label("請輸入表達式：");
		pnlBottom.add(btnStart);
		pnlBottom.add(label);
		pnlBottom.add(txtField);
		pnlBottom.add(btnOk);
		btnStart.setActionCommand("start");
		btnStart.addActionListener(this);
		btnOk.setActionCommand("ok");
		btnOk.addActionListener(this);
		
	}
	public void init()
	{
		for(int i=0;i<4;i++)
		{
			myStatus[i]=0;
		}
	}
	
	public void actionPerformed(ActionEvent evt)
	{
		/**按下開始按鈕**/
		if(evt.getActionCommand().equals("start"))
		{
			for(int i=0;i<4;i++)
			{
				myStatus[i]=(int)(Math.random()*13)+1;
			}
			pnlCenter.repaint();
			
		}
		/**按下確定按鈕**/
		else if(evt.getActionCommand().equals("ok"))
		{
			try
			{
				int result=calculateString(txtField.getText().trim());
				if(result==-1)
				{
					txtField.setText("");
					txtField.requestFocus();
					new MsgDlg("你輸入的表達式不合法，請重新輸入！");
				}
				else if(result!=24)
				{
					txtField.setText("");
					txtField.requestFocus();
					new MsgDlg("你輸入的表達式的值為"+result+",請重新輸入!");
				}
				else if(result==24)
				{
					txtField.requestFocus();
					new MsgDlg("祝賀你，你的輸入正確！");
					for(int i=0;i<4;i++)
					{
						myStatus[i]=(int)(Math.random()*13)+1;
					}
					pnlCenter.repaint();
					txtField.setText("");
					txtField.requestFocus();
				}
			}
			catch(Exception e)
			{
				e.printStackTrace();
			}
		}
	}
	public int calculateString(String str)
	{
		/**
		  判斷表達式的合法性
		**/
		
		int[] numbers=new int[4];
		String[] operators=new String[4];
		for(int i=0;i<4;i++)
		{
			operators[i]="";
		}
		
		String tempStr,myString="";
		int numberNo=0,operatorNo=0;
		for(int i=0;i<str.length();i++)
		{
			tempStr=str.substring(i,i+1);
			if(isNumber(tempStr))
			{
				myString+=tempStr;
			}
			else if(isOperator(tempStr))
			{
				if(numberNo>=4 || operatorNo>=3)return -1;
				try
				{
					numbers[numberNo]=Integer.parseInt(myString);
				}
				catch(Exception e)
				{
				}
				myString="";
				numberNo++;
				operators[operatorNo]=tempStr;
				operatorNo++;
			}
			else
			{
				return -1;
			}
		}
		if(myString.length()!=0 && numberNo==3)
		{
			try
			{
				numbers[numberNo]=Integer.parseInt(myString);
			}
			catch(Exception e)
			{
				return -1;
			}
		}
		else return -1;
		/**
		   判斷表達式的數(shù)字就是撲克牌上的數(shù)字
		 **/
		int tempStatus[]=new int[4];
		for(int i=0;i<4;i++)
		{
			tempStatus[i]=myStatus[i];
		}
		for(int i=0;i<4;i++)
		{
			int j=0;
			boolean existed=false;
			while(j<4 && !existed)
			{
				if(tempStatus[j]==numbers[i])
				{
					tempStatus[j]=-1;
					existed=true;
				}
				j++;
			}
			if(!existed)return -1;
		}
		/**
			計算表達式的值
		**/
		int result=numbers[0];
		for(int i=0;i<3;i++)
		{
			if(operators[i].equals("+"))
			{
				result+=numbers[i+1];
			}
			else if(operators[i].equals("-"))
			{
				result-=numbers[i+1];
			}
			else if(operators[i].equals("*"))
			{
				result*=numbers[i+1];
			}
			else if(operators[i].equals("/"))
			{
				result/=numbers[i+1];
			}
		}
		return result;
	}
	private boolean isNumber(String str)
	{
		if(str.equals("0")||str.equals("1")||
		   str.equals("2")||str.equals("3")||
		   str.equals("4")||str.equals("5")||
		   str.equals("6")||str.equals("7")||
		   str.equals("8")||str.equals("9"))
		{
			return true;
		}
		else
		{
			return false;
		}
	}
	private boolean isOperator(String str)
	{	 	
		if(str.equals("+")||str.equals("-")||
		   str.equals("*")||str.equals("/"))
		{
			return true;
		}
		else
		{
			return false;
		}
	}
}
class MyImgPanel extends Panel
{
	final int IMGSIZE=100;
	Image[] myImage=new Image[14];
	Calculate24 mycal24;
	/**Load picture**/
	public MyImgPanel(Calculate24 cal24)
	{
		mycal24=cal24;
	}
	public void initImg()
	{
		//System.out.println("hahahhah");
		URL url=null;
        try
        {
        	url=Class.forName("Calculate24").getResource("img/back.JPG");
        }
        catch(Exception e){e.printStackTrace();}
        myImage[0]=getToolkit().getImage(url);
        for(int i=1;i<=13;i++)
        {
        	try
	        {
	        	url=Class.forName("Calculate24").getResource("img/"+i+".JPG");
	        	System.out.println(url.toString());
	        }
	        catch(Exception e){}
	        myImage[i]=getToolkit().getImage(url);
        }
        
        MediaTracker mt=new MediaTracker(this);
        for(int i=0;i<=13;i++)
        {
        	mt.addImage(myImage[i],i);
    	}
        try{
            mt.wait();
            mt.checkAll();
        }
        catch(Exception e){}
	}
	public void paint(Graphics g)
	{
		for(int i=0;i<4;i++)
		{
			g.drawImage(myImage[mycal24.myStatus[i]],i*IMGSIZE+5,5,this);
		}
	}
}
class MsgDlg extends Frame implements ActionListener
{
	Label label=new Label();
	public MsgDlg(String strMsg)
	{
		super();
		setTitle("表達式結(jié)果");
		Panel p=new Panel();
		add(p);
		p.add(label);
		label.setText(strMsg);
		setSize(200,100);
		setLocation(400,300);
		Button btnOk=new Button("確定");
		btnOk.addActionListener(this);
		p.add(btnOk);
		show();
	}
	public void actionPerformed(ActionEvent evt)
	{
		this.dispose();
	}
}