package test;

public class DiceTally {

    private final int minimum;
    private static final int numberOfDice = 2;
    private static final int numberOfSides = 6;
    private static final int minimumRoll = numberOfDice;
    private static final int numberofCombinations = numberOfDice * numberOfSides - minimumRoll + 1;
    private final int[] tallies = new int[numberofCombinations];
    private int numberOfTosses;

    public DiceTally(int min) {
        minimum = min;
    }

    public void tallyAndReport() {
        clearState();
        calculateTallies();
        report();
    }

    private void clearState() {
        clearTallies();
        clearTossCount();
    }

    private void clearTallies() {
        for (int i = 0; i < numberofCombinations; i++) {
            setTally(i, 0);
        }
    }

    private void clearTossCount() {
        numberOfTosses = 0;
    }

    private void calculateTallies() {
        while (!isDoneTallying()) {
            calculateTally();
            incrementTossCount();
        }
    }

    private void incrementTossCount() {
        numberOfTosses++;
    }

    private boolean isDoneTallying() {
        return getMinimumTally() >= minimum;
    }

    private int getMinimumTally() {
        int min = Integer.MAX_VALUE;
        for (int i = 0; i < numberofCombinations; i++) {
            min = Math.min(min, getTally(i));
        }
        return min;
    }

    private void calculateTally() {
        incrementTally(convertDiceRollToIndex(rollDice()));
    }

    private int rollDice() {
        int sum = 0;
        for (int i = 0; i < numberOfDice; i++) {
            sum += rollDie();
        }
        return sum;
    }

    private int rollDie() {
        return 1 + (int) (Math.random() * numberOfSides);
    }

    private int convertDiceRollToIndex(int roll) {
        return roll - minimumRoll;
    }

    private void incrementTally(int index) {
        setTally(index, getTally(index) + 1);
    }

    private int getTally(int index) {
        return tallies[index];
    }

    private void setTally(int index, int value) {
        tallies[index] = value;
    }

    private void report() {
        for (int i = 0; i < numberofCombinations; i++) {
            reportCombination(i);
        }
        reportTossCount();
    }

    private void reportCombination(int index) {
        System.out.println(convertIndexToDiceRoll(index) + " " + getTally(index));
    }

    private void reportTossCount() {
        System.out.println("toss count: " + numberOfTosses);
    }

    private int convertIndexToDiceRoll(int index) {
        return index + minimumRoll;
    }
}