/**
 * Ydl.java
 *
 * Created on 13. April 2008, 21:01
 * author:  haui
 * contact: haui45@web.de
 * 
 * complie with 
 * 		javac Ydl.java
 * run with
 * 		java Ydl
 *
 */

import java.util.regex.*;
import java.net.*;
import java.io.*;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

/**
 *
 * @author haui 
 */
public class Ydl extends javax.swing.JFrame {
    
    /** Creates new form mainFrame */
    public Ydl() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        fileChooser = new javax.swing.JFileChooser();
        errorDialog = new javax.swing.JOptionPane();
        jLabel1 = new javax.swing.JLabel();
        inputLink = new javax.swing.JTextField();
        getButton = new javax.swing.JButton();
        outputLink = new javax.swing.JTextField();
        downloadButton = new javax.swing.JButton();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jLabel5 = new javax.swing.JLabel();
        progressBar = new javax.swing.JProgressBar();
        filesizeLabel = new javax.swing.JTextField();
        statusLabel = new javax.swing.JTextField();
        clearButton = new javax.swing.JButton();
        jLabel7 = new javax.swing.JLabel();

        fileChooser.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                fileChooserActionPerformed(evt);
            }
        });

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Ydl");

        jLabel1.setText("Enter your Link below:");

        inputLink.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                inputLinkActionPerformed(evt);
            }
        });

        getButton.setText("Get Link!");
        getButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                getButtonActionPerformed(evt);
            }
        });

        outputLink.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                outputLinkActionPerformed(evt);
            }
        });

        downloadButton.setText("Download!");
        downloadButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                downloadButtonActionPerformed(evt);
            }
        });

        jLabel2.setText("Downloadlink:");

        jLabel3.setText("Status information:");

        jLabel4.setText("Filesize:");

        jLabel5.setText("Status:");

        filesizeLabel.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                filesizeLabelActionPerformed(evt);
            }
        });

        clearButton.setText("Clear!");
        clearButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                clearButtonActionPerformed(evt);
            }
        });

        jLabel7.setText("Progress:");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel1)
                    .addComponent(jLabel2)
                    .addComponent(jLabel3)
                    .addComponent(jLabel7)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(getButton)
                        .addGap(131, 131, 131)
                        .addComponent(downloadButton, javax.swing.GroupLayout.DEFAULT_SIZE, 110, Short.MAX_VALUE)
                        .addGap(145, 145, 145)
                        .addComponent(clearButton))
                    .addComponent(inputLink, javax.swing.GroupLayout.DEFAULT_SIZE, 546, Short.MAX_VALUE)
                    .addComponent(outputLink, javax.swing.GroupLayout.DEFAULT_SIZE, 546, Short.MAX_VALUE)
                    .addComponent(progressBar, javax.swing.GroupLayout.DEFAULT_SIZE, 546, Short.MAX_VALUE)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel4)
                            .addComponent(jLabel5))
                        .addGap(35, 35, 35)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(filesizeLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(statusLabel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addContainerGap())
        );

        layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {clearButton, getButton});

        layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {filesizeLabel, statusLabel});

        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(inputLink, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jLabel2)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(outputLink, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jLabel3)
                .addGap(12, 12, 12)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel4)
                    .addComponent(filesizeLabel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel5)
                    .addComponent(statusLabel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addComponent(jLabel7)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(progressBar, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(getButton)
                    .addComponent(clearButton)
                    .addComponent(downloadButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addGap(32, 32, 32))
        );

        layout.linkSize(javax.swing.SwingConstants.VERTICAL, new java.awt.Component[] {filesizeLabel, jLabel4});

        layout.linkSize(javax.swing.SwingConstants.VERTICAL, new java.awt.Component[] {jLabel5, statusLabel});

        layout.linkSize(javax.swing.SwingConstants.VERTICAL, new java.awt.Component[] {outputLink, progressBar});

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void inputLinkActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_inputLinkActionPerformed
        // TODO add your handling code here:
}//GEN-LAST:event_inputLinkActionPerformed

    private void outputLinkActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_outputLinkActionPerformed
        // TODO add your handling code here:
}//GEN-LAST:event_outputLinkActionPerformed

private void activateButton(boolean bool){
    downloadButton.setEnabled(bool);
    clearButton.setEnabled(bool);
    getButton.setEnabled(bool);
    downloadButton.paintAll(downloadButton.getGraphics());
    clearButton.paintAll(clearButton.getGraphics());
    getButton.paintAll(getButton.getGraphics());
}    
private String getDownloadLink(String input){
                String line = "http://youtube.com/get_video?video_id=";
                String url = input;
                String inputLine;
		String magicId = "";
                String downloadLink;
                activateButton(false);
                if (checkLink(input)==false){
                    JOptionPane.showMessageDialog(this, "Not a valid link!");
                    activateButton(true);
                    clear();
                    return null;
                }
            
         try{    
                
                URL link = new URL(url);
		BufferedReader in = new BufferedReader(
				new InputStreamReader( link.openStream()));
		
		while ((inputLine = in.readLine()) != null){
			if (inputLine.matches("(.)*, \"t\": \"(.)*")){
				inputLine = inputLine.replaceAll("(.)*, \"t\": \"", "");
				inputLine = inputLine.replaceAll("\", \"hl\": \"(.)*", "");
				magicId = inputLine;
				break;
			}
			
		}
		in.close();
		url = url.replaceAll("(http://)?(www.)?(de.)?(youtube.com/watch[?]v=)?", "");
		downloadLink = line + url + "&t=" + magicId;
            }
            catch (Exception e){
                activateButton(true);
                JOptionPane.showMessageDialog(this, "An unknown Error occured!");
                return null;
            }
            if (magicId.equals("")){
                    JOptionPane.showMessageDialog(this, "http request error or invalid video ID!");
                    activateButton(true);
                    return null;
            }
            activateButton(true);
            return downloadLink;
}
    private void getButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_getButtonActionPerformed
        // TODO add your handling code here:

		String url = inputLink.getText();
		String downloadLink;
                if ((downloadLink=getDownloadLink(url)) == null){
                    outputLink.setText("Error!");
                    return;
                }
                outputLink.setText(downloadLink);
                
     
    }//GEN-LAST:event_getButtonActionPerformed

    private void downloadButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_downloadButtonActionPerformed
        // TODO add your handling code here:
        String url = null;
        if ((url = getDownloadLink(inputLink.getText())) == null){
            return;
        }
        fileChooser.showOpenDialog(jLabel1);
    }//GEN-LAST:event_downloadButtonActionPerformed

    private void fileChooserActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_fileChooserActionPerformed
        // TODO add your handling code here:

        String url = null;
        url = getDownloadLink(inputLink.getText());
        File f = null;
        f = fileChooser.getSelectedFile();
        if (f == null){
            return;
        }
        URLConnection conn = null;
        InputStream in = null;
       
        statusLabel.setText("please wait...");
        statusLabel.paintAll(statusLabel.getGraphics());

        outputLink.setText(url);
        outputLink.paintAll(outputLink.getGraphics());
       
        clearButton.setEnabled(false);
        clearButton.paintAll(clearButton.getGraphics());
        activateButton(false);
        try {
            
            URL fileToDownload = new URL(url);
            FileOutputStream outStream = new FileOutputStream(f);
            BufferedOutputStream buffOutStream = new 
                       BufferedOutputStream(outStream);
            conn = fileToDownload.openConnection();
            int size = conn.getContentLength() / 1024;
            if (size == 0){
                outputLink.setText("Error");
                JOptionPane.showMessageDialog(this, "http request error or invalid video ID!");
                activateButton(true);
                return;
            }
            
            filesizeLabel.setText(size + " KB");
            filesizeLabel.paintAll(filesizeLabel.getGraphics());
            in = conn.getInputStream();
            byte buffer[] = new byte[1024];
            int numRead;
            long numWritten = 0;
            int i=1;
            long steps = size*1024 / 100;

            progressBar.setValue(i);
            progressBar.paint(progressBar.getGraphics());
            while((numRead = in.read(buffer)) != -1){
                buffOutStream.write(buffer, 0, numRead);
                numWritten += numRead;
                
                if(numWritten >= i*steps){
                    i++;
                    progressBar.setValue(i);
                    progressBar.paint(progressBar.getGraphics());
                    statusLabel.setText(i+"%");
                    statusLabel.paintAll(statusLabel.getGraphics());
                }

            }
            buffOutStream.close();
            in.close();
            
        }
        catch (Exception e){
            activateButton(true);
            JOptionPane.showMessageDialog(this, "http request error or invalid video ID!");
            return;
            
        }
        statusLabel.setText("done!");
        activateButton(true);

    }//GEN-LAST:event_fileChooserActionPerformed
    
    private void clear(){
        inputLink.setText("");
        outputLink.setText("");
        statusLabel.setText("");                                           
        filesizeLabel.setText("0 KB");
        progressBar.setValue(0);
    }
    
    private void filesizeLabelActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_filesizeLabelActionPerformed
        // TODO add your handling code here:
    }//GEN-LAST:event_filesizeLabelActionPerformed

    private void clearButtonActionPerformed(java.awt.event.ActionEvent evt) {                                            
       clear();
    }
    /**
     * 
     * @param s - the string to be checked
     * @return  true if the string is a valid youtube videolink,
     *          false else
     */
    private boolean checkLink(String s){
        Pattern p = Pattern.compile("http://((www)|(de))[.]youtube[.]com/watch[?]v=.*");
        Matcher m = p.matcher(s);
        return m.matches();
    }
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Ydl().setVisible(true);
            }
        });
    }
    
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton clearButton;
    private javax.swing.JButton downloadButton;
    private javax.swing.JOptionPane errorDialog;
    private javax.swing.JFileChooser fileChooser;
    private javax.swing.JTextField filesizeLabel;
    private javax.swing.JButton getButton;
    private javax.swing.JTextField inputLink;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel7;
    private javax.swing.JTextField outputLink;
    private javax.swing.JProgressBar progressBar;
    private javax.swing.JTextField statusLabel;
    // End of variables declaration//GEN-END:variables
    
}