/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * LogViewer.java
 *
 * Created on May 27, 2010, 10:04:29 AM
 */
package usda.weru.util;

import de.schlichtherle.truezip.file.TFile;
import de.schlichtherle.truezip.file.TFileReader;
import java.io.BufferedReader;
import java.util.List;
import javax.swing.SwingWorker;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger; 

/**
 *
 * @author Joseph Levin <joelevin@weru.ksu.edu>
 */
public class LogViewer extends javax.swing.JFrame {

    private static final long serialVersionUID = 1L;

    private static final Logger LOGGER = LogManager.getLogger(LogViewer.class);
    private final TFile logFile;
    private SwingWorker<Void, String> worker;

    /** Creates new form LogViewer */
    public LogViewer() {
        this(About.getLog());
    }

    /**
     *
     * @param logFile
     */
    public LogViewer(TFile logFile) {
        initComponents();
        this.logFile = logFile;
        refreshLog();
        setTitle("WEPS Log: " + logFile.getAbsolutePath());
        setIconImage (About.getWeruIconImage());
    }

    /** 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.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        closeButton = new javax.swing.JButton();
        logScrollPane = new javax.swing.JScrollPane();
        logText = new javax.swing.JTextArea();
        autoScroll = new javax.swing.JCheckBox();

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        setTitle("WEPS Log");
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosed(java.awt.event.WindowEvent evt) {
                formWindowClosed(evt);
            }
        });

        closeButton.setText("Close");
        closeButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                closeButtonActionPerformed(evt);
            }
        });

        logText.setColumns(20);
        logText.setEditable(false);
        logText.setFont(new java.awt.Font("Monospaced", 0, 12));
        logText.setRows(5);
        logScrollPane.setViewportView(logText);

        autoScroll.setSelected(true);
        autoScroll.setText("Automatically scroll");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(logScrollPane, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 483, Short.MAX_VALUE)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(autoScroll)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 305, Short.MAX_VALUE)
                        .addComponent(closeButton)))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(logScrollPane, javax.swing.GroupLayout.DEFAULT_SIZE, 463, Short.MAX_VALUE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(closeButton)
                    .addComponent(autoScroll))
                .addContainerGap())
        );

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

    private void closeButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_closeButtonActionPerformed
        close();
    }//GEN-LAST:event_closeButtonActionPerformed

    private void formWindowClosed(java.awt.event.WindowEvent evt) {//GEN-FIRST:event_formWindowClosed
        close();
    }//GEN-LAST:event_formWindowClosed

    private boolean closing;

    private synchronized void close() {
        if (closing) {
            return;
        }
        closing = true;
        setVisible(false);
        cancel();
        dispose();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new LogViewer().setVisible(true);
            }
        });
    }

    /**
     *
     */
    public synchronized void refreshLog() {
        worker = new SwingWorker<Void, String>() {

            @Override
            @SuppressWarnings("finally")
            protected Void doInBackground() throws Exception {
                BufferedReader reader = null;
                try {
                    reader = new BufferedReader(new TFileReader(logFile));
                    String line;
                    while (true) {
                        line = reader.readLine();
                        if (line != null) {
                            publish(line);
                        } else {
                            Thread.sleep(500);
                        }
                    }
                } catch (InterruptedException ie) {
                } finally {
                    if (reader != null) {
                        try {
                            reader.close();
                        } catch (Exception e) {
                            LOGGER.error("Unable to close log stream.", e);
                        }
                    }
                    return null;
                }
            }

            @Override
            protected void process(List<String> chunks) {
                //append each line to the text field

                for (String line : chunks) {
                    logText.append(line);
                    logText.append("\n");
                    if (autoScroll.isSelected()) {
                        logScrollPane.getVerticalScrollBar().setValue(logScrollPane.getVerticalScrollBar().getMaximum());
                    }
                }

            }

            @Override
            protected void done() {
                clear();
            }

        };

        worker.execute();

    }

    private synchronized void cancel() {
        if (worker != null) {
            worker.cancel(true);
        }
    }

    private synchronized void clear() {
        worker = null;
    }


    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JCheckBox autoScroll;
    private javax.swing.JButton closeButton;
    private javax.swing.JScrollPane logScrollPane;
    private javax.swing.JTextArea logText;
    // End of variables declaration//GEN-END:variables

}