package frame;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;

/**
 * Class to display custom window with information about 
 * necessary licenses + copyright information
 * 
 * @author 
 * @version
 */
@SuppressWarnings("serial")
public class licenseWindow extends JFrame {
	//Class variables
	JButton previous, next;
	JLabel licenseName;
	JEditorPane licenseText;
	JScrollPane licenseScroll;
	ArrayList<URL> licenseList;
	ArrayList<String> licenseNameList;
	int index;

	/**
	 * Default constructor for License frame
	 * 
	 */
	public licenseWindow() {
		//Make frame with size, location, layout
		super("Licenses");
		this.setSize(600, 400);
		this.setLocationRelativeTo(null);
		this.setLayout(new BorderLayout());
		//Set the frame icon to an image loaded from a file.
		this.setIconImage(new ImageIcon(getClass().getResource("/resources/16x16/creative_commons.png")).getImage());
		
		//Add licenses to list
		licenseList = new ArrayList<URL>();
		licenseList.add(getClass().getResource("/resources/apache license.txt"));
		licenseList.add(getClass().getResource("/resources/ganymed license.txt"));
		licenseList.add(getClass().getResource("/resources/CC0 1.0 Universal.txt"));
		licenseList.add(getClass().getResource("/resources/Attribution 3.0 Unported.txt"));
		licenseList.add(getClass().getResource("/resources/Attribution-ShareAlike 3.0 Unported.txt"));
		licenseList.add(getClass().getResource("/resources/WTFPL.txt"));
		
		//Add license names to list
		licenseNameList = new ArrayList<String>();
		licenseNameList.add("Apache License");
		licenseNameList.add("Ganymed SSH2 License");
		licenseNameList.add("Creative Commons 0 1.0 Universal");
		licenseNameList.add("Creative Commons - Attribution");
		licenseNameList.add("Creative Commons - Attribution Share Alike");
		licenseNameList.add("WTFPL - Do What The Fuck You Want To Public License");
		
		//Make starting index
		index = 0;
		
		//Make label for license title
		licenseName = new JLabel("");
		licenseName.setHorizontalAlignment(JLabel.CENTER);
		//TODO pick a font
		//licenseName.setFont(new Font("Times New Roman", Font.BOLD, 25));
		
		//Text editor pane with legal license text
		licenseText = new JEditorPane();
		licenseText.setEditable(false);
		licenseText.setContentType("text/html");
		
		//Load first license
		setLicense(index);
		
		licenseScroll = new JScrollPane(licenseText);
		
		//Make JButton for previous and next
		ImageIcon prevIco = new ImageIcon(getClass().getResource("/resources/32x32/arrow_left.png"));
		previous = new JButton(prevIco);
		previous.setEnabled(false);
		previous.addActionListener(new ActionListener(){
			@Override
			public void actionPerformed(ActionEvent arg0) {
				showPrevious();
			}
		});
		ImageIcon nextIco = new ImageIcon(getClass().getResource("/resources/32x32/arrow_right.png"));
		next = new JButton(nextIco);
		next.setEnabled(true);
		next.addActionListener(new ActionListener(){
			@Override
			public void actionPerformed(ActionEvent e) {
				showNext();
			}
		});
		
		//TODO fix so that buttons retain smaller size after adding to layout
		previous.setSize(50, 50);
		next.setSize(50, 50);
		
		//Add everything to panel and make it viewable
		this.add(licenseName, BorderLayout.NORTH);
		this.add(previous, BorderLayout.WEST);
		this.add(licenseScroll, BorderLayout.CENTER);
		this.add(next, BorderLayout.EAST);
		this.setVisible(true);
	}

	private void setLicense(int i) {
		licenseName.setText(licenseNameList.get(i));
		try {
			licenseText.setPage(licenseList.get(i));
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		this.repaint();
	}

	/**
	 * Shows next license to display
	 * 
	 */
	protected void showNext() {
		index++;
		setLicense(index);
		if(index > 0)
		{
			previous.setEnabled(true);
		}
		if(index == licenseList.size() - 1)
		{
			next.setEnabled(false);
		}
	}

	/**
	 * Show previous license to display
	 * 
	 */
	protected void showPrevious() {
		index--;
		setLicense(index);
		if(index == 0)
		{
			previous.setEnabled(false);
		}
		if(index < licenseList.size() - 1)
		{
			next.setEnabled(true);
		}
	}

}