package  tu.app;
/**
 * @autor Andrei Lebedev
 * 
 * This is main application class.
 * 
 **/

 import  java.util.*;
 import  java.io.*;


 public   class  Main
{
	/* termination signal */
	 static   public   boolean  killall = false;
	
	/* sensor list */
	 static  LinkedList<Sensor> sensors =  new  LinkedList<Sensor>();
	
	/**
	 * Main entry
	 * @param args command line parameters (not applicable)
	 */
	 public   static   void  main ( String args[]) 
	{
		//System.out.println( "Test application from Andrei Lebedev.");
		initialize();
		
		 boolean  repeat_question = false;
		 while ( true )
		{	
			 if ( !repeat_question )
				printStatistics();
			 else 
				System.out.println( "Reply is not correct, please, try one more time.");
			System.out.println( "Do you want to print statistics again? [Yes]|No");
			
			// Ask use either for new statistics or for interruption
			 try 
			{
				BufferedReader keyboard =  new  BufferedReader(  new  InputStreamReader( System.in));
				String key = keyboard.readLine();
				
				// Check if answer either empty (defaut "Yes"), "Y" or "Yes", 
				// case does not matter
				 if ( key.length() ==  0  || 
					key.compareToIgnoreCase( "Y") ==  0  ||
					key.compareToIgnoreCase( "Yes") ==  0  )
				{	
					repeat_question = false;
					 continue ;
				}
				
				// Check if answer either "N" or "No", 
				// case does not matter
				 if ( key.compareToIgnoreCase( "N") ==  0  ||
					key.compareToIgnoreCase( "No") ==  0  )
					 break ;
				
				repeat_question = true;
			}
			 catch ( IOException ioe )
			{
				System.err.println( "I/O error: "+ioe.getMessage() );
				 break ;
			}
		}	
	
		// Kill all threads
		 try 
		{
			killall = true;
			// wait all threads
			Thread.sleep(  50 );
		}	
		 catch ( InterruptedException iee )
		{
			System.err.println( "Main process died: "+iee.getMessage() );
		}
		//System.out.println( "Done");
	}
	
	/**
	 * Creates several (random) instances of Sensor class 
	 *
	 */
	 public   static   void  initialize()
	{
		/* Create random sensor list */
		 int  cnt =  new   Double (  7 . 0 *Math.random()).intValue()+ 1 ; // at least one sensor 
		//System.out.println( "Created "+cnt+" sensors");
		
		 while ( cnt-- >  0  )
			sensors.add(  new  Sensor());
	}

	/**
	 * print statistics 
	 *
	 */
	 public   static   void  printStatistics()
	{
		System.out.println( "Statistics");
		 for (  int  i =  0 ; i < sensors.size(); i++)
		{
			Sensor s = sensors.get( i);
			System.out.printf( "\tSensor %s, average=%6.2f\n", i+ 1 , s.getAverageValue());
		}
		
		System.out.println( "\n");
	}
}