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import acm.program.ConsoleProgram;
import de.ur.mi.util.RandomGenerator;

public class DiceExperimentStart extends ConsoleProgram {
    private RandomGenerator rGen = RandomGenerator.getInstance();

    public void run() {
        int numDice = readInt("Please enter the number of dice to throw: ");
        int numExperiments = readInt("Please enter the number of times the experiment should be repeated: ");
        double averageThrows = calculateAverageThrowsUntilMax(numDice, numExperiments);
        println("It took me " + averageThrows + " throws on average to throw the max number.");
    }

    /**
     * Calculate the average number of throws needed to reach the maximal dice roll result with numDice
     * in numExperiments
     * @param numDice
     * @param numExperiments
     * @return average number of throws needed to reach the max dice roll result
     */
    private double calculateAverageThrowsUntilMax(int numDice, int numExperiments) {
        int totalThrows = 0;

        for (int i = 0; i < numExperiments; i++) {
            int throws = throwUntilMax(numDice);
            totalThrows += throws;
        }

        return (double) totalThrows / numExperiments;
    }

    /**
     * Throw the dice until the maximal result (only sixes) is achieved
     * @param numDice
     * @return number of throws until max result
     */
    private int throwUntilMax(int numDice) {
        int throws = 0;

        while (true) {
            throws++;
            boolean allSixes = true;

            for (int i = 0; i < numDice; i++) {
                if (throwOneDie() != 6) {
                    allSixes = false;
                    break;
                }
            }

            if (allSixes) {
                break;
            }
        }

        return throws;
    }

    /**
     * Throw one die
     * @return result of die throw
     */
    private int throwOneDie() {
        return rGen.nextInt(1, 6);
    }
}
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