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package io.github.oliviercailloux.teachingexamples;

import io.github.oliviercailloux.g421.CyclicDiceRoller;

public class MyCyclic implements CyclicDiceRoller {

  public static void main(String[] args) {
    CyclicDiceRoller c = new MyCyclic();
    c.roll();
    c.setResult(4, 3, 2);
    c.roll();
    System.out.println("First: " + c.first());
    c.roll();
    System.out.println("First: " + c.first());
    c.roll();
    System.out.println("First: " + c.first());
    c.roll();
    System.out.println("First: " + c.first());
  }

  private int firstDie;
  private int secondDie;
  private int thirdDie;

  private int resultFirstDie;
  private int resultSecondDie;
  private int resultThirdDie;

  public MyCyclic() {
    firstDie = 0;
    secondDie = 0;
    thirdDie = 0;

    resultFirstDie = 1;
    resultSecondDie = 1;
    resultThirdDie = 1;
  }

  @Override
  public void roll() {
    firstDie = resultFirstDie;
    secondDie = resultSecondDie;
    thirdDie = resultThirdDie;
    shift();
  }

  private void shift() {
    int originalFirstDie = resultFirstDie;
    resultFirstDie = resultThirdDie;
    resultThirdDie = resultSecondDie;
    resultSecondDie = originalFirstDie;
  }

  @Override
  public int first() {
    if (firstDie == 0) {
      throw new IllegalStateException();
    }
    return firstDie;
  }

  @Override
  public int second() {
    if (secondDie == 0) {
      throw new IllegalStateException();
    }
    return secondDie;
  }

  @Override
  public int third() {
    if (thirdDie == 0) {
      throw new IllegalStateException();
    }
    return thirdDie;
  }

  @Override
  public void setResult(int firstDie, int secondDie, int thirdDie) {
    checkDie(firstDie);
    checkDie(secondDie);
    checkDie(thirdDie);

    resultFirstDie = firstDie;
    resultSecondDie = secondDie;
    resultThirdDie = thirdDie;
  }

  private void checkDie(int die) {
    if (die < 1 || die > 6) {
      throw new IllegalArgumentException();
    }
  }
}