@Override
public Weapon requestNextMove(Player player) {
Scanner scanner = new Scanner(System.in);
Weapon nextMove = null;
System.out.println(player.getDescription() + ", select next move:");
Weapon[] weapons = Weapon.values();
for (Weapon weapon : weapons) {
StringBuilder promptBuilder = new StringBuilder();
promptBuilder.append(weapon.name()).append(" : ").append(weapon.ordinal());
System.out.println(promptBuilder.toString());
}
while (nextMove == null) {
if (scanner.hasNextInt()) {
int ordinal = scanner.nextInt();
if (ordinal >= 0 && ordinal < weapons.length) {
nextMove = weapons[ordinal];
} else {
System.out.println("Error please re-enter [0-" + (weapons.length - 1) + "]");
}
} else {
scanner.next();
System.out.println("Error please re-enter [0-" + (weapons.length - 1) + "]");
}
}
return nextMove;
}
@Override
public WeaponJudgingResult judgeWinningWeapon(Weapon weaponOne, Weapon weaponTwo) {
validateNumberOfWeaponsOrFail();
if (weaponOne.equals(weaponTwo)) {
return WeaponJudgingResult.tie();
} else {
int numWeapons = Weapon.values().length;
int mod = (numWeapons + weaponOne.ordinal() - weaponTwo.ordinal()) % numWeapons;
if (mod % 2 == 1) {
return new WeaponJudgingResult(weaponOne);
} else {
return new WeaponJudgingResult(weaponTwo);
}
}
}
private void validateNumberOfWeaponsOrFail() {
if (Weapon.values().length < 3 || Weapon.values().length % 2 == 0) {
throw new UnsupportedOperationException(
"ModuloArithmeticWeaponJudge is only a valid strategy when there are at least 3 weapons and the number of weapons is an odd number");
}
}