#include <LiquidCrystal_I2C.h>

int columns = 16;
int rows = 2;

LiquidCrystal_I2C lcd(0x27, columns, rows);

// variable holding the button state 
int buttonState; 

// counter for which led to light up
int ledCounter = 1;
 
// variable holding previous button state 
int previousButtonState = LOW; 
 
// variable holding the LED state 
int ledStateR = HIGH; 
int ledStateG = LOW;
int ledStateB = LOW;
 
int buttonPin = 2; 
const int ledPinR = 12; 
const int ledPinG = 11;
const int ledPinB = 10;
 
// millis always stored in long 
// becomes too big for int after 32,767 millis or around 32 seconds 
 
// timestamp of a previous bounce 
long previousDebounceTime = 0; 
 
// debounce time in millis, if the LED is still quirky increase this value 
long debounceDelay = 10; 
 
void setup() { 
  pinMode(buttonPin, INPUT);
  pinMode(ledPinR, OUTPUT); 
  pinMode(ledPinG, OUTPUT); 
  pinMode(ledPinB, OUTPUT); 

  lcd.begin(16,2);
  lcd.init();
  lcd.backlight();


} 
 
bool buttonUp() {
  // for now it's the same as in previous example 
  int reading = digitalRead(buttonPin);  
   
  // if the previous reading is different than the previous button state   
  if (reading != previousButtonState) { 
    // we'lll reset the debounce timer 
    previousDebounceTime = millis(); 
  }  
   
  // if the reading is the same over a period of debounceDelay 
  if ((millis() - previousDebounceTime) > debounceDelay) { 
    // check if the button state is changed 
    if (reading != buttonState) { 
      buttonState = reading; 
       
      // toggle the LED state only when the button is released
      if (buttonState == LOW) { 
        return true;
      } 
    } 
  } 
  // save current reading so that we can compare in the next loop 
  previousButtonState = reading; 
  return false;
}

void ledControl(int countLimit) {
  if (ledCounter > countLimit) {
    ledCounter = 1;
  }

  if (ledCounter == 1) {
    ledStateR = 1;
    ledStateG = 0;
    ledStateB = 0;
  } else if (ledCounter == 2) {
    ledStateR = 0;
    ledStateG = 1;
    ledStateB = 0;
  } else if (ledCounter == 3) {
    ledStateR = 0;
    ledStateG = 0;
    ledStateB = 1;
  } else if (ledCounter == 4) {
    ledStateR = 1;
    ledStateG = 1;
    ledStateB = 1;
  } else if (ledCounter == 5) {
    ledStateR = 0;
    ledStateG = 0;
    ledStateB = 0;
  } else if (ledCounter == 6) {
    ledStateR = 0;
    ledStateG = 0;
    ledStateB = 1;
  } else if (ledCounter == 7) {
    ledStateR = 0;
    ledStateG = 1;
    ledStateB = 0;
  } else if (ledCounter == 8) {
    ledStateR = 1;
    ledStateG = 0;
    ledStateB = 0;
  } else if (ledCounter == 9) {
    ledStateR = 0;
    ledStateG = 0;
    ledStateB = 0;
  }
}

void setLCDto(String top, String bottom) {
  lcd.setCursor(0,0);
  lcd.print(top);
  lcd.setCursor(0,1);
  lcd.print(bottom);
}

void lcdControl() {
  digitalWrite(ledPinR, ledStateR); 
  digitalWrite(ledPinG, ledStateG); 
  digitalWrite(ledPinB, ledStateB); 

  if (ledCounter == 1) {
    setLCDto("Current Led:", "Red  ");
  } else if (ledCounter == 2) {
    setLCDto("Current Led:", "Green");
  } else if (ledCounter == 3) {
    setLCDto("Current Led:", "Blue ");
  } else if (ledCounter == 4) {
    setLCDto("Current Led:", "All  ");
  } else if (ledCounter == 5) {
    setLCDto("Current Led:", "None ");
  } else if (ledCounter == 6) {
    setLCDto("Current Led:", "Blue ");
  } else if (ledCounter == 7) {
    setLCDto("Current Led:", "Green");
  } else if (ledCounter == 8) {
    setLCDto("Current Led:", "Red  ");
  } else if (ledCounter == 9) {
    setLCDto("Current Led:", "None ");
  }
}

void loop() { 

  if (buttonUp()) {
    ledCounter++;
  }

  ledControl(9);
  
  lcdControl();

}