//  Clock.kt  (c) Kari Laitinen

//  http://www.naturalprogramming.com

//  2023-01-12  File created.

/*  In this program the interrupt() method is used to stop
    the Thread.sleep() operations. In addition, the 
    stop_this_thread() methods are called to ensure that the
    threads stop. It is likely that this program would work
    without the stop_this_thread() methods.
*/

import java.time.LocalDateTime

class  ThreadToShowSeconds : Thread()
{
   var must_show_seconds  =  true

   fun stop_this_thread()
   {
      must_show_seconds  =  false
   }

   override fun run()
   {
      while ( must_show_seconds  ==  true )
      {
         val date_and_time_now = LocalDateTime.now()

         val seconds_of_current_time  = date_and_time_now.getSecond()

         if ( ( seconds_of_current_time  %  20 )  ==  0 )
         {
            print( "\n" )
         }

         print( String.format( " %02d", seconds_of_current_time ) )

         try
         {
            Thread.sleep( 1000 ) // Delay of one second.
         }
         catch ( caught_exception : InterruptedException )
         {
            must_show_seconds  =  false
         }
      }
   }
}


class  ThreadToShowFullTimeInfo : Thread()
{
   var must_show_full_time_info  =  true

   fun stop_this_thread()
   {
      must_show_full_time_info  =  false
   }

   override fun run()
   {
      var date_and_time_now = LocalDateTime.now()

      val  seconds_to_first_time_printing  =
                  60  -  date_and_time_now.getSecond()

      try
      {
         Thread.sleep( ( seconds_to_first_time_printing * 1000 ).toLong() )
      }
      catch ( caught_exception : InterruptedException )
      {
         must_show_full_time_info  =  false
      }

      while ( must_show_full_time_info  ==  true )
      {
         date_and_time_now = LocalDateTime.now()

         print( String.format( "\n\n %tT \n\n", date_and_time_now ) )

         try
         {
            Thread.sleep( 60000 ) // Delay of 60 seconds.
         }
         catch ( caught_exception : InterruptedException )
         {
            must_show_full_time_info  =  false
         }
      }
   }
}


fun main()
{
   val thread_to_show_seconds = ThreadToShowSeconds()

   val thread_to_show_full_time_info = ThreadToShowFullTimeInfo()

   print( "\n Press the Enter key to stop the clock.\n\n" )

   thread_to_show_seconds.start()
   thread_to_show_full_time_info.start()

   val any_string_from_keyboard  =  readLine()!!

   thread_to_show_seconds.stop_this_thread()
   thread_to_show_full_time_info.stop_this_thread()
   thread_to_show_seconds.interrupt()
   thread_to_show_full_time_info.interrupt()
}