/*
 * Umass Amherst
 * CS377 Operating System
 * Labx: xxxx
 * Author: AHF
 * Date: 9/10/2
 *
 * Compile : javac -d . TestParse.java
 *
 * The commend line interface is :
 *    java TestParse <fname>
 *
 */

import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.awt.*;
import java.lang.*;

// class ShowCanvas extends Canvas
//
//

class ShowCanvas extends Canvas
{
    int r;

    //  public ShowCanvas(String fname)throws IOException
    //
    //  - Create the ShowCanvas
    //  - Acquire the sphere radius from the configuration file
    //

    public ShowCanvas(String fname)throws IOException{ 
    	String curLine,preLine;

    	try {
	    // Open the file
            BufferedReader input=new BufferedReader(new FileReader(fname));

	    // Read the first line
	    curLine=input.readLine();

	    // Check contents of first line
            if(curLine.indexOf("radius=")==-1)
		{
		    System.out.println("Parse error: missing radius=");
		    System.exit(1);
		};
	    
	    // Figure out where in the string to grab the integer
            int start=curLine.indexOf("radius=");
	    String sub = curLine.substring(start+7, curLine.length());

	    // Extract the integer
	    try
		{
		    r = Integer.parseInt(sub);
		}
	    catch(NumberFormatException e)
		{
		    // Catch parse errors

		    System.out.println("Parse error: missing integer");
		    System.exit(1);
		};

	}catch (FileNotFoundException e) {
	    // Deal with file error
            System.out.println("File not found: " + fname);
            System.exit(1);
        }
    }

    // Draw the canvas, which consists of a sphere
    public void paint(Graphics g)
    {
	g.setColor(Color.red);
	g.fillOval(250-r/2, 250-r/2, r, r);
    }
  
}


//  public class TestParse extends JFrame
//
//  
public class TestParse extends JFrame {

    
    //  public TestParse(String fname) throws IOException
    //
    //  Create the top-level object
    //
    
  public TestParse(String fname) throws IOException {

      // Respond to the window close event by dying 
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent e) {
             System.out.println("Exit when Closed event");
             System.exit(0); 
         }
       }
      );

      // Set window title
      setTitle("Test Parse ");

      // Do not allow window size changes
      setResizable(false);

      // Force window size
      setSize(500, 500);

      // Do the work of getting the configuration file and creating the
      //  window.
      try{
	  ShowCanvas can=new ShowCanvas(fname);
	  // Attach the canvas to the window
	  getContentPane().add(can, BorderLayout.CENTER);
      }
      catch(IOException e){
	  System.out.println("I/O error ");	
      }
  }

    //  public static void main(String[] args)
    //
    //  Program start
    //

    public static void main(String[] args)
    {
	// Check the number of arguments
	if (args.length!=1) {
	    System.err.println("usage: java TestParse <fname>");
	    return;
	}
	try{
	    // Create the primary object instance
	    TestParse tp = new TestParse(args[0]);

	    // Draw the window
	    tp.show();
	}
	catch (IOException e){
	    System.out.println("I/O error ");	
	}
    }
}