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

/**
 * Uppgift 3.0
 * @author emi-lind
 *
 */
public class Browser extends JFrame
{
	
	
	private JTextArea browserArea;
	private JTextField inputField;
	
	private Browser()
	{
		super("Simple Browser 1.0");
		initJFrameSettings();
		String defaultWebpage = "http://people.dsv.su.se/emi-lind/";
		initLayout(defaultWebpage);
		loadWebpage(defaultWebpage);
	}
	
	/**
	 * Laddar en hemsida och visar källkoden
	 * @param aTargetUrl sidan att ladda
	 */
	private void loadWebpage(String aTargetUrl)
	{
	
		StringBuffer output = new StringBuffer();
		String finalOutput = new String();
		try
		{
			String line = new String();
			URL url = new URL(aTargetUrl);
			BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()));
			int lineNo = 0;
			while((line = br.readLine()) != null)
			{
				
				output.append(++lineNo + ":\t " + line + "\n");
			}
			finalOutput = output.toString();
			br.close();
		}
		catch(IOException err)
		{
			finalOutput = "Page not found: " + aTargetUrl;
		}
		this.browserArea.setText(finalOutput);
		
	}
	
	/**
	 * Laddar grafiken och lyssnare
	 * @param Defaulttexten för inputField
	 */
	private void initLayout(String aTargetUrl)
	{
		inputField = new JTextField(aTargetUrl);
		browserArea = new JTextArea();
		browserArea.setEditable(false);
		Container cont = this.getContentPane();
		cont.add(inputField, BorderLayout.NORTH);
		cont.add(new JScrollPane(browserArea), BorderLayout.CENTER);
		inputField.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent aev)
			{
				loadWebpage(inputField.getText());
			}
			
		});
		
		
		validate();
	}
	
	private void initJFrameSettings()
	{
		
		this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
		this.setVisible(true);
		this.setSize(700, 500);
	}
	
	/**
	 * @param args används inte
	 */
	public static void main(String[] args){new Browser();}
	private static final long serialVersionUID = 1L;
}