// Clock.java
// Robert Sedgewick and Kevin Wayne
// Slightly modified by Andrew Davison, Nov. 2022

/* Animate a clock, starting from the current time

   Usage:
     > compile Clock.java
     > run Clock
*/

import java.time.*;

public class Clock
{

  public static void main(String[] args)
  {
    StdDraw.enableDoubleBuffering();

    LocalDateTime date = LocalDateTime.now();
    int t = date.toLocalTime().toSecondOfDay();

    while (true) {
      // remainder operator with doubles so all hands move every second
      double seconds = t % 60;
      double minutes = (t / 60.0) % 60;
      double hours = (t / 3600.0) % 12;

      StdDraw.clear(StdDraw.LIGHT_GRAY);
      StdDraw.setPenRadius();

      // clock face
      StdDraw.setPenColor(StdDraw.BLACK);
      StdDraw.filledCircle(0.5, 0.5, 0.45);

      // hour markers
      StdDraw.setPenColor(StdDraw.BLUE);
      for (int i = 0; i < 12; i++) {
        double theta = Math.toRadians(i * 30);
        StdDraw.filledCircle(0.5 + 0.4 * Math.cos(theta),
                             0.5 + 0.4 * Math.sin(theta), 0.025);
      }

      // second hand
      StdDraw.setPenRadius(0.01);
      StdDraw.setPenColor(StdDraw.YELLOW);
      double angle1 = Math.toRadians(6 * seconds);
      double r1 = 0.4;
      StdDraw.line(0.5, 0.5, 0.5 + r1 * Math.sin(angle1),
                   0.5 + r1 * Math.cos(angle1));

      // minute hand
      StdDraw.setPenRadius(0.02);
      StdDraw.setPenColor(StdDraw.GRAY);
      double angle2 = Math.toRadians(6 * minutes);
      double r2 = 0.3;
      StdDraw.line(0.5, 0.5, 0.5 + r2 * Math.sin(angle2),
                   0.5 + r2 * Math.cos(angle2));

      // hour hand
      StdDraw.setPenRadius(0.025);
      StdDraw.setPenColor(StdDraw.WHITE);
      double angle3 = Math.toRadians(30 * hours);
      double r3 = 0.2;
      StdDraw.line(0.5, 0.5, 0.5 + r3 * Math.sin(angle3),
                   0.5 + r3 * Math.cos(angle3));

      // digital time
      int second = t % 60;
      int minute = (t / 60) % 60;
      int hour   = (t / 3600) % 12;
      String time = String.format("%2d:%02d:%02d", hour, minute, second);
      StdDraw.setPenColor(StdDraw.BOOK_RED);
      StdDraw.text(0.5, 0.0, time);

      StdDraw.show();
      StdDraw.pause(1000);   // pause 1000 ms = 1 second
      t++;
    }
  } /* main */


}  // end of Clock class