import javax.swing.*;
import java.util.*;

/**
 * This program generates 10 fraction arithmetic problems.  User is prompted for a time limit for each question.
 * Fractions must be multiplied, divided, added, or subtracted.
 * Scoring is as follows:
 *            Correct    Wrong
 * Under Time  10         3
 *Over Time    6          0
 * Score is kept and shown at the end of the round.
 * 
 * The user then has the choice to play again.
 * 
 * 
 * @author Bill Kukowski
 */
class FractionArithmetic {
	/**
	 * Main method.
	 *
	 * @params args
	 */
	public static void main(String[] args) {
		
		boolean playAgain = true;
		while (playAgain) //enables user to play again
		{
			//stores time limit for problem
			int seconds = Integer.parseInt(JOptionPane.showInputDialog(null, "How many seconds do you want to complete each problem? (Default 30)", 30));
			//generates new problem set
			Problems problems = new Problems();
			//sets object used for input.
			Scanner scanner = new Scanner(System.in);
			String guess;
			float guessF;
			long startTime, answerTime;
			boolean correctAns, underTime;
			//used for scorekeeping.
			int[] scores = new int[4];
			//displays each problem
			for (int p=0;p<10;p++)
			{
				guess = "";
				//get current system time
				startTime = System.currentTimeMillis();
				//ouutput problem.
				System.out.println(problems.getNumerator1(p) + "    " + problems.getNumerator2(p));
				System.out.println("_" + " " + problems.getOperation(p) + " " + "_");
				System.out.println(problems.getDenominator1(p) + "    " + problems.getDenominator2(p));
				System.out.println("You have " + seconds + " seconds remaining.  Enter answer as a fraction (e.g. 4/7)");
				//store user's input
				guess = scanner.next();
				// split user's input into two ints and store to array
				String[] components = guess.split("/");	
				//divides ints to get float. (needed to compare to float generated by problems.class)
				guessF = (float) Integer.parseInt(components[0]) / (float) Integer.parseInt(components [1]);
				//get system time after answer is entered.
				answerTime = System.currentTimeMillis();
				//set booloean for correct answer
				correctAns = guessF == problems.getAnswer(p);
				//set boolean for undertime
				underTime = answerTime < startTime + (seconds * 1000);
				//add correct score to correct array entry
				if ( correctAns && underTime)
					scores[0]++;
				if ( correctAns && !underTime)
					scores[1]++;
				if ( !correctAns && underTime)
					scores[2]++;
				if ( !correctAns && !underTime)
					scores[3]++;
				//generate separator between problems
				System.out.println("");
				System.out.println("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");
				System.out.println("");
			}
			//tally up total score
			int points = (10 * scores[0]) + (6 * scores[1]) + (3 * scores[2]);
			//display final score
			System.out.println("");
			System.out.println("");
			System.out.println("");
			System.out.println("********You're Finished!********");
			System.out.println("");
			System.out.println("                            Under            Over");
			System.out.println("                            Time Limit       Time Limit");
			System.out.println("");
			System.out.println("Correct Answers             " + scores[0] + "                   " + scores[1]);
			System.out.println("Wrong Answers               " + scores[2] + "                   " + scores[3]);
			System.out.println("Total Points: " + points + "(" + (scores[0] * 10) + " + " + (scores[1] * 6) + " + " + (scores[2] * 3) + " + 0");
			//prompt to play again
			System.out.println("Do you want to play again? 1 for yes 0 for no.");
			//check playAgain
			if (!(scanner.nextInt() == 1)) {
				playAgain = false;
			}
		}
	}
}






/**
 * This class generates 10 Fraction arithmetic problems. Fractons and operations are stored in an array.
 *
 * @author Bill Kukowski
 */
class Problems {
	
	private int[][] fractionGroup1 = new int[2][10];
	private int[][] fractionGroup2 = new int[2][10];
	private int[] operations = new int[10];
	private float[]	answers = new float[10];
	private float tmpNum1 = 0;
	private float tmpNum2 = 0;
	
	public Problems()
	{
		//generates first array of fractions
		for (int r=0;r<2;r++)
		{
			for (int c=0;c<fractionGroup1[r].length;c++)
			{
				fractionGroup1[r][c] = ( (int) (Math.random() * 9) + 1 );
			}
		}
		
		//generates second arrray of fractions
		for (int r=0;r<2;r++)
		{
			for (int c=0;c<fractionGroup2[r].length;c++)
			{
				fractionGroup2[r][c] = ( (int) (Math.random() * 9) + 1 );
			}
		}
		
		// generates array of operations		
		for (int i = 0;i < operations.length;i++)
		{
			operations[i] = ( (int) (Math.random() * 4) + 1 );
		}
		
		//generates answers for each problem
		for (int i = 0;i < 10;i++)
		{
			tmpNum1 = ( (float) fractionGroup1[0][i] ) / ( (float) fractionGroup1[1][i] );
			tmpNum2 = ( (float) fractionGroup2[0][i] ) / ( (float) fractionGroup2[1][i] );
			
			switch (operations[i])
			{
				case 1: answers[i] = tmpNum1 / tmpNum2;
					break;
				case 2: answers[i] = tmpNum1 * tmpNum2;
					break;
				case 3: answers[i] = tmpNum1 + tmpNum2;
					break;
				case 4: answers[i] = tmpNum1 - tmpNum2;
					break;						
			}
		}
	}

	//returns numerator of 1st number
	public String getNumerator1(int problemNum)
	{
		return Integer.toString(fractionGroup1[0][problemNum]);
	}
	//reutrns numerator of 2nd number
	public String getNumerator2(int problemNum)
	{
		return Integer.toString(fractionGroup2[0][problemNum]);
	}
	//returns operation as string
	public String getOperation(int problemNum)
	{
		String tmpOperation = "";
	
		switch (operations[problemNum])
		{
			case 1: tmpOperation = "/";
				break;
			case 2: tmpOperation = "*";
				break;
			case 3: tmpOperation = "+";
				break;
			case 4: tmpOperation = "-";
				break;	
		}
		return tmpOperation;
	}
	//returns denominator of 1st number
	public String getDenominator1(int problemNum)
	{
		return Integer.toString(fractionGroup1[1][problemNum]);
	}
	//reurns denominator of 2nd numer
	public String getDenominator2(int problemNum)
	{
		return Integer.toString(fractionGroup2[1][problemNum]);
	}
	//returns answer for problem.
	public float getAnswer(int problemNum)
	{
		return answers[problemNum];
	}
}