import java.util.InputMismatchException;//Import Exception Handler for input Mismatches
import java.util.Scanner;//Import Scanner
import java.util.Random;//Import Random number generator

/*
National Lottery Simulator Program with exception handling
Asks user how many draws they would like to simulate
Takes 6 unique numbers between 1 and 49 from the user
Simulates the specified number of draws
If there are matching numbers, it will display how many matches there are and which numbers matched
Stops if all numbers match and informs the user that they have won
Reports how many draws were done and how many were one
Displays statistics on how many draws had how many matches
*/
public class Lab13
{
	//begin main method
	public static void main( String Args[] )
	{
		//create Scanner to obtain input from command window
		Scanner input = new Scanner( System.in );
		
		//Create Random Number generator
		Random randomNumber = new Random();
		
		int noDraws = 0;//Variable for how many draws the user would like.
		int userPicks[] = new int[ 6 ];//array variable for the user's choice of numbers
		int draw[] = new int[ 6 ];//array for storing the values of each draw
		int drawsDone = 0;//counter for how many draws have been done
		int matchingNo[] = new int[ 6 ];//array to store numbers that match
		int frequencyMatch[] = { 0, 0 , 0 , 0 , 0 ,0, 0 };//Variable used to count how many draws are done where x numbers matched
		int drawsWon = 0;//initialize variable to count how many draws were won
		int exception = 0;//variable used to repeat question if there is an exception
		
		//Asking the user to input how many draws they would like to run
		try
		{
			System.out.print( "\n\nWelcome to the National Lottery Simulator!\n\n" );
			System.out.print( "How many draws would you like?\n\n" );
			noDraws = input.nextInt();//user input goes to noDraws
			exception = 0;
		}//end try
		//exception handler should the user attempt to input a non integer value
		catch 	( InputMismatchException InputMismatchException )
		{	
			exception = 1;
			//reports the exception:
			System.err.printf( "\nException: %s\n\n",
				InputMismatchException );
			input.nextLine();//clears the input
			System.out.println( "You must enter a whole number between one and 2,147,483,647, please try again.\n\n" );
		}//end catch
		
		//if an exception is encountered when obtaining input, this while will repeat the question until a proper input is recieved
		while ( exception == 1 )
		{
			try
			{
				System.out.print( "How many draws would you like?\n\n" );
				noDraws = input.nextInt();//user input goes to noDraws
				exception = 0;
			}//end try
			//exception handler should the user attempt to input a non integer value
			catch 	( InputMismatchException InputMismatchException )
			{	
				exception = 1;
				//reports the exception:
				System.err.printf( "\nException: %s\n\n",
					InputMismatchException );
				input.nextLine();//clears the input
				System.out.println( "You must enter a whole number between one and 2,147,483,647, please try again.\n\n" );
			}//end catch
		}//end while
		
		//Asking the user to pick their numbers
		System.out.print( "\n\nPlease choose 6 different numbers between 1 and 49:" );
		
		/*counter will repeat until all 6 elements of array "userPicks" have been filled
		with valid data*/
		for ( int counter1 = 0; counter1 <= 5; counter1++ )
		{
			boolean valid = true;//initialize variable for testing if the input is valid

			//request user input
			try	
			{
				//counter1 is used to help the user track how many numbers they have entered so far
				System.out.printf( "\nEnter Number %d: ", ( counter1 + 1 ) );
				//counter1 is used to select which part of the array the input is stored in
				userPicks[ counter1 ] = input.nextInt();
			}//end try
			
			//exception handler should the user attempt to input a non integer value
			catch	 ( InputMismatchException InputMismatchException )
			{
				//reports the exception:
				System.err.printf( "\nException: %s\n\n",
					InputMismatchException );
				input.nextLine();//clears the input
				System.out.println( "You must enter a whole number between 1 and 49, please try again.\n\n" );
			}//end catch
			
			//checks if user input is between 1 and 49, if it is not, valid is set to false
			if 	( userPicks[ counter1 ] <= 0 || userPicks[ counter1 ] >= 50 )
			{
				valid = false;
			}//end if
			
			//This ensures that the program will only check if the input is a unique number if more than one number has been entered
			if	( counter1 > 0 )
			{	
				//For statement repeats until all data currently stored in the array has been checked
				for 	( int counter2 = 0; counter2 < counter1; counter2++ )
				{
					//Sets "valid" to false if the user attempts to input the same number twice
					if	( userPicks[ counter1 ] == userPicks[ counter2 ] )
					{
					valid = false;	
					}//end if
				}//end for
			}//end if
			
			//If user input is not valid, informs the user and reduces counter1 by 1
			if	( valid == false )
			{	
				System.out.print( "Invalid input. You must enter a number between 1 and 49," );
				System.out.print( "\nyou cannot enter the same number twice, please try again." );
				//ensures that the value is asked for again
				counter1 = ( counter1 - 1 );
			}//end if
		}
		/*For statement to repeatedly run a random number draw until the user inputted "noDraws" has been satisfied
		variable counter3 is used as the counter for this for statement and begins as being equal to "noDraws.*/
		for ( int counter3 = noDraws; counter3 > 0; counter3 = ( counter3 - 1 ) )
		{ 
			//For statement repeats until 6 random unique numbers have been generated
			for ( int counter4 = 0; counter4 <=5; counter4++ )
			{
				boolean unique = true;//boolean used to check if random numbers are unique
				
				/*Generates a random number to place into the element of array "draw"
				counter4 is used to decide which element of the array the number goes to
				RandomNumber is scaled to 49 and shifted by 1*/
				draw[ counter4 ] = 1 + randomNumber.nextInt( 49 );
				
				//checks if random number is unique only if more than one has been entered
				if	( counter4 > 0 )
				{	
					//For statement repeats until each one of the numbers has been checked
					for 	( int counter5 = 0; counter5 < counter4; counter5++ )
					{	
						/*counter5 is used to select which array element needs checking
						The if statement sets unique to false if the number is not unique*/
						if ( draw[ counter4 ] == draw[ counter5 ] )
						{
							unique = false;	
						}//end if
					
					}//end for
					
					/*if the random number is not unique it will be discarded and another 
					random number will be generated in it's place*/
					if	( unique == false )
					{	
						counter4 = ( counter4 - 1 );
					}//end if
				
				}//end if
				
			}//end for
			
			drawsDone++;//increments counter DrawsDone
			
			//Prints the draw number
			System.out.printf( "\n\nDraw%d: ", drawsDone );
			
			//for statement repeats until all numbers in the draw printed
			for ( int counter6 = 0; counter6 < 6; counter6++ )
			{
				//counter6 is used to decide which element of array "draw" is to be displayed next
				System.out.printf( "%d ", draw[ counter6 ] );
			}//end for
					
			int matches = 0;//initializing variable to count how many of the user's numbers match those in draw
					
			/*For statement Checks if the values stored in userPicks match those in the draw
			Uses counter7 to decide which element of array "draw" to check*/
			for ( int counter7 = 0; counter7 < 6; counter7++ )
			{
				//For statement uses counter8 to decide which element of array "userPicks" to check 
				for ( int counter8 = 0; counter8 < 6; counter8++ )
				{
					//If statement checks if the number matches
					if ( draw[ counter7 ] == userPicks[ counter8 ] )
					{
						/*Stores the matching number into the element of MatchingNo,
						selected by the number of matches*/
						matchingNo[ matches ] = userPicks[ counter8 ];
						
						matches++;//increments matches
						
					}//end if
	
				}//end for
				
				//Checks if all 6 numbers of the draw match the user's choices
				if ( matches == 6 )
				{
					//Sets counter3 to 0 to end the draws if all 6 numbers match
					counter3 = 0;
					//Prints out a message informing the user that they have won
					System.out.print( "\n\n6 Matches! \n\nCongratulations, you've won an estimated crackpot of 300000000 quatloos!" );
					
					drawsWon = 1;//increments the amount of draws won
					
				}//end if
				
				
			
			}//end for
			
			//Prints the number of matching numbers
			if ( matches < 6 && matches > 0 )
			{
				System.out.printf( "\n%d Matches! Matching numbers are:\n", matches );
				
				//for statement to display the element of array 'MatchingNo' determined by the value of 'matches'
				for ( int counter9 = 0; counter9 < matches; counter9++ )
				{
					System.out.printf( "%d ", matchingNo[ counter9 ] );
				}//end for
					
			}//end if
			
			//adds 1 to the value of the element of array frequencyMatch selected by the value of variable matches
			frequencyMatch[ matches ] = ( frequencyMatch[ matches ] + 1);
			
		}//end for
		
		//reports how many draws were done
		System.out.printf( "\n\nYou won %d draw(s) out of %d\n\n", drawsWon, drawsDone );
		
		//For statement to display the data stored in array 
		for ( int counter10 = 0; counter10 < 7; counter10++ )
		{	
			//Prints out how many draws had x amount of matches
			System.out.printf( "There were %d draws with %d matches.\n",
				frequencyMatch[ counter10 ], counter10 );
		}//end for
	
	}//end method main
	
}//end class Lab13