/*
 * Copyright © 2023 Dean Lee
 */
package alarm;

import java.lang.Error;
import javax.swing.Timer;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.util.Calendar;
import java.net.URL;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.Clip;

/**
 *
 * @author dean
 */
public class Alarm extends javax.swing.JFrame implements ActionListener {

    private Audio audio = new Audio();
    private boolean audioPlaying = false;
    private boolean alarmEnabled = true;
    private Calendar previousTime = captureTime();
    private Calendar currentTime;
    private Calendar alarmTime = Calendar.getInstance();
        
    /**
     * Creates new form Alarm
     */
    public Alarm() {
        initComponents();
        initAlarm();
        initTimer();
    }

    /**
     * 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() {

        timeDisplay = new javax.swing.JLabel();
        message = new javax.swing.JLabel();
        alarmDisplay = new javax.swing.JLabel();
        dateDisplay = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Alarm");
        addKeyListener(new java.awt.event.KeyAdapter() {
            public void keyPressed(java.awt.event.KeyEvent evt) {
                formKeyPressed(evt);
            }
        });

        timeDisplay.setFont(new java.awt.Font("Dialog", 1, 48)); // NOI18N
        timeDisplay.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        timeDisplay.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);

        message.setFont(new java.awt.Font("Dialog", 1, 18)); // NOI18N
        message.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        message.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);

        alarmDisplay.setFont(new java.awt.Font("Dialog", 1, 36)); // NOI18N
        alarmDisplay.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        alarmDisplay.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);

        dateDisplay.setFont(new java.awt.Font("Dialog", 1, 36)); // NOI18N
        dateDisplay.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        dateDisplay.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(183, 183, 183)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(alarmDisplay, javax.swing.GroupLayout.PREFERRED_SIZE, 225, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(dateDisplay, javax.swing.GroupLayout.PREFERRED_SIZE, 225, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(timeDisplay, javax.swing.GroupLayout.PREFERRED_SIZE, 225, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(61, 61, 61)
                        .addComponent(message, javax.swing.GroupLayout.PREFERRED_SIZE, 463, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap(76, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(message, javax.swing.GroupLayout.PREFERRED_SIZE, 46, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(70, 70, 70)
                .addComponent(timeDisplay, javax.swing.GroupLayout.PREFERRED_SIZE, 82, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(dateDisplay, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 46, Short.MAX_VALUE)
                .addComponent(alarmDisplay, javax.swing.GroupLayout.PREFERRED_SIZE, 46, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
        );

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

    private void formKeyPressed(java.awt.event.KeyEvent evt) {//GEN-FIRST:event_formKeyPressed
        if (audioPlaying)
            alarmOff();
        else
            handleSpecificKey(evt);    
    }//GEN-LAST:event_formKeyPressed

    private void handleSpecificKey(java.awt.event.KeyEvent evt) {
        switch(evt.getKeyCode()) {
            case KeyEvent.VK_PERIOD:
                alarmTime.roll(Calendar.HOUR_OF_DAY, 1);
                break;
            case KeyEvent.VK_COMMA:
                alarmTime.roll(Calendar.HOUR_OF_DAY, -1);
                break;
            case KeyEvent.VK_K:
                alarmTime.roll(Calendar.MINUTE, -1);
                break;
            case KeyEvent.VK_L:
                alarmTime.roll(Calendar.MINUTE, 1);
                break;
            case KeyEvent.VK_SEMICOLON:
                alarmTime.roll(Calendar.MINUTE, 10);
                break;
            case KeyEvent.VK_J:
                alarmTime.roll(Calendar.MINUTE, -10);
                break;
            case KeyEvent.VK_SLASH:
                alarmTime.set(Calendar.HOUR_OF_DAY, 12);
                break;
            case KeyEvent.VK_M:
                alarmTime.set(Calendar.HOUR_OF_DAY, 0);
                break;
            case KeyEvent.VK_SPACE:
                toggleAlarmEnabled();
                break;
        };
        updateAlarmDisplay();
    }
    
    // basically the "ticking" method.
    public void actionPerformed(ActionEvent e) {
        setTime();
        handleTimeChange();
        previousTime = currentTime;
    }
    
    private void alarmOff() {
        if (audioPlaying)
            audio.stop();
        audioPlaying = false;
        setAlarmMessage();
    }
    
    private void alarmOn() {
        if (!audioPlaying)
            audio.play();
        audioPlaying = true;
        message.setText("Press any key to stop audio.");
    }
    
    private void toggleAlarmEnabled() {
        if (alarmEnabled)
            alarmEnabled = false;
        else
            alarmEnabled = true;
        setAlarmMessage();
    }
    
    private void setAlarmMessage() {
        if (alarmEnabled)
            message.setText("Alarm enabled. Press space bar to disable.");
        else
            message.setText("Alarm disabled. Press space bar to enable.");
    }
    
    private void updateAlarmDisplay() {
        alarmDisplay.setText(String.format("%tR", alarmTime));
    }
    
    private Calendar captureTime() {
        Calendar cal = Calendar.getInstance();
        cal.setTimeInMillis(System.currentTimeMillis());
        return cal;
    }
    
    private void setTime() {
        currentTime = captureTime();
        timeDisplay.setText(String.format("%tR", currentTime));
        dateDisplay.setText(String.format("%tD", currentTime));
    }
    
    private boolean timesMatch(Calendar timeA, Calendar timeB) {
        return (timeA.get(Calendar.HOUR_OF_DAY) == timeB.get(Calendar.HOUR_OF_DAY)) && (timeA.get(Calendar.MINUTE) == timeB.get(Calendar.MINUTE));
    }
    
    private boolean timeChanging() {
        return !timesMatch(previousTime, currentTime);
    }
    
    private boolean alarmMatching() {
        return timesMatch(currentTime, alarmTime);
    }
    
    private void handleAlarmMatch() {
        if (alarmEnabled && alarmMatching())
            alarmOn();
    }
    
    private void handleTimeChange() {
        if (timeChanging())
            handleAlarmMatch();
    }
    
    private void initAlarm() {
        alarmTime.set(Calendar.HOUR_OF_DAY, 0);
        alarmTime.set(Calendar.MINUTE, 0);
        updateAlarmDisplay();
        setAlarmMessage();
    }
    
    private void initTimer() {
        timer = new Timer(1000, this);
        timer.setInitialDelay(0);
        timer.start();
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Alarm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Alarm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Alarm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Alarm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Alarm().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JLabel alarmDisplay;
    private javax.swing.JLabel dateDisplay;
    private javax.swing.JLabel message;
    private javax.swing.JLabel timeDisplay;
    // End of variables declaration//GEN-END:variables

    // Manually declared variables - can modify!
    private Timer timer;
}

class Audio {
    
    private Clip clip;
    
    public Audio() {
        init();
    }
    
    private void init() {
        try {
            URL url = getClass().getResource("/resources/wakeupkorn.wav");
            AudioInputStream stream = AudioSystem.getAudioInputStream(url);
            AudioFormat format = stream.getFormat();
            DataLine.Info info = new DataLine.Info(Clip.class, format);
            Clip line = (Clip) AudioSystem.getLine(info);
            line.open(stream);
            line.setLoopPoints(0, -1);
            clip = line;
        }
        catch (Throwable e) {
            throw new Error(e.getMessage());
        }
    }
    
    public void play() {
        clip.loop(Clip.LOOP_CONTINUOUSLY);
    }
    
    public void stop() {
        clip.stop();
        clip.setFramePosition(0);
    }
}