#include <LiquidCrystal_I2C.h>

String currentSelected = "MK45";
String currentSelectedValue = "foo";

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int buttonPin = 13;
bool lastButtonState = LOW;
bool currentButtonState;
bool actionDone = false;

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);

  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  lcd.print("Arleigh Burke");
  delay(1000);
  lcd.clear();
}

void loop() {
  currentButtonState = digitalRead(buttonPin);

  if (lastButtonState == HIGH && currentButtonState == LOW && !actionDone) {
    digitalWrite(LED_BUILTIN, LOW);
    changeWeaponry();
    actionDone = true;
  }

  if (currentButtonState == HIGH) {
    actionDone = false;
  }

  lastButtonState = currentButtonState;

  lcd.setCursor(0, 0);
  lcd.print("                ");  
  lcd.setCursor(0, 0);
  lcd.print(currentSelected);

  lcd.setCursor(0, 1);
  lcd.print("                ");  
  lcd.setCursor(0, 1);
  lcd.print(currentSelectedValue);

  delay(10);  //debounce
}

void changeWeaponry() {
  if (currentSelected == "MK45") {
    currentSelected = "CRAM_1";
  } else if (currentSelected == "CRAM_1") {
    currentSelected = "CRAM_2";
  } else if (currentSelected == "CRAM_2") {
    currentSelected = "MK45";
  } else {
    currentSelected = "ERROR";
  }

}