import java.awt.*;
import javax.swing.*;

public class Exercise15_20 extends JFrame {
  public static void main(String[] args) {
    // Obtain the total seconds since the midnight, Jan 1, 1970
    long totalSeconds = System.currentTimeMillis() / 1000;

    // Compute the current second in the minute in the hour
    int currentSecond = (int)(totalSeconds % 60);

    // Obtain the total minutes
    long totalMinutes = totalSeconds / 60;

    // Compute the current minute in the hour
    int currentMinute = (int)(totalMinutes % 60);

    // Obtain the total hours
    long totalHours = totalMinutes / 60;

    // Compute the current hour
    int currentHour = (int)(totalHours % 24);

    // Create a frame to hold the clock
    Exercise15_20 frame = new Exercise15_20();
    frame.setTitle("Exercise15_20");
    frame.add(new DetailedClock
                               (currentHour, currentMinute, currentSecond));
    MessagePanel messagePanel = new MessagePanel(
      currentHour + ":" + currentMinute + ":" + currentSecond + " GMT");
    messagePanel.setCentered(true);
    messagePanel.setForeground(Color.blue);
    frame.add(messagePanel, BorderLayout.SOUTH);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(300, 350);
    frame.setLocationRelativeTo(null); // Center the frame
    frame.setVisible(true);
  }
}

class DetailedClock extends JPanel {
  private int hour;
  private int minute;
  private int second;
  protected int xCenter, yCenter;
  protected int clockRadius;

  public DetailedClock() {
  }

  // Construct a clock panel
  public DetailedClock(int hour, int minute, int second) {
    this.hour = hour;
    this.minute = minute;
    this.second = second;
  }

  // Draw the clock
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);

    // Initialize clock parameters
    clockRadius =
      (int)(Math.min(getSize().width, getSize().height) * 0.9 * 0.5);
    xCenter = (getSize().width) / 2;
    yCenter = (getSize().height) / 2;

    // Draw circle
    g.setColor(Color.black);
    g.drawOval(xCenter - clockRadius, yCenter - clockRadius,
               2 * clockRadius, 2 * clockRadius);

    // Draw second hand
    if (secondHandVisible) {
      int sLength = (int)(clockRadius * 0.7);
      int xSecond =
        (int)(xCenter + sLength * Math.sin(second * (2 * Math.PI / 60)));
      int ySecond =
        (int)(yCenter - sLength * Math.cos(second * (2 * Math.PI / 60)));
      g.setColor(Color.red);
      g.drawLine(xCenter, yCenter, xSecond, ySecond);
    }

    // Draw minute hand
    if (minuteHandVisible) {
      int mLength = (int)(clockRadius * 0.6);
      int xMinute =
        (int)(xCenter + mLength * Math.sin(minute * (2 * Math.PI / 60)));
      int yMinute =
        (int)(yCenter - mLength * Math.cos(minute * (2 * Math.PI / 60)));
      g.setColor(Color.blue);
      g.drawLine(xCenter, yCenter, xMinute, yMinute);
    }
    // Draw hour hand
    if (hourHandVisible) {
      int hLength = (int)(clockRadius * 0.5);
      int xHour = (int)(xCenter +
                        hLength *
                        Math.sin((hour + minute / 60.0) * (2 * Math.PI / 12)));
      int yHour = (int)(yCenter -
                        hLength *
                        Math.cos((hour + minute / 60.0) * (2 * Math.PI / 12)));
      g.setColor(Color.black);
      g.drawLine(xCenter, yCenter, xHour, yHour);
    }
    // Display more details on the clock
    for (int i = 0; i < 60; i++) {
      double percent;

      if (i % 5 == 0) {
        percent = 0.9;
      }
      else {
        percent = 0.95;
      }

      int xOuter = (int)(xCenter +
                         clockRadius * Math.sin(i * (2 * Math.PI / 60)));
      int yOuter = (int)(yCenter -
                         clockRadius * Math.cos(i * (2 * Math.PI / 60)));
      int xInner = (int)(xCenter +
                         percent * clockRadius * Math.sin(i * (2 * Math.PI / 60)));
      int yInner = (int)(yCenter -
                         percent * clockRadius * Math.cos(i * (2 * Math.PI / 60)));

      g.drawLine(xOuter, yOuter, xInner, yInner);
    }

    // Display hours on the clock
    g.setColor(Color.black);
    for (int i = 0; i < 12; i++) {
      int x = (int)(xCenter +
                    0.8 * clockRadius * Math.sin(i * (2 * Math.PI / 12)));
      int y = (int)(yCenter -
                    0.8 * clockRadius * Math.cos(i * (2 * Math.PI / 12)));

      g.drawString("" + ((i == 0) ? 12 : i), x, y);
    }
  }

  /** Return hour */
  public int getHour() {
    return hour;
  }

  /** Set a new hour */
  public void setHour(int hour) {
    this.hour = hour;
    repaint();
  }

  /** Return minute */
  public int getMinute() {
    return minute;
  }

  /** Set a new minute */
  public void setMinute(int minute) {
    this.minute = minute;
    repaint();
  }

  /** Return second */
  public int getSecond() {
    return second;
  }

  /** Set a new second */
  public void setSecond(int second) {
    this.second = second;
    repaint();
  }

  private boolean hourHandVisible = true;
  private boolean minuteHandVisible = true;
  private boolean secondHandVisible = true;

  public boolean isHourHandVisible() {
    return hourHandVisible;
  }

  public boolean isMinuteHandVisible() {
    return hourHandVisible;
  }

  public boolean isSecondHandVisible() {
    return secondHandVisible;
  }

  public void setHourHandVisible(boolean hourHandVisible) {
    this.hourHandVisible = hourHandVisible;
    repaint();
  }

  public void setMinuteHandVisible(boolean minuteHandVisible) {
    this.minuteHandVisible = minuteHandVisible;
    repaint();
  }

  public void setSecondHandVisible(boolean secondHandVisible) {
    this.secondHandVisible = secondHandVisible;
    repaint();
  }

}