#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

const int SCREEN_WIDTH = 128;
const int SCREEN_HEIGHT = 64;
const int SCREEN_ADDRESS =0x3C;

Adafruit_SSD1306 display( SCREEN_WIDTH, SCREEN_HEIGHT, &Wire);

// pin numbers
const int selectButtonPin = 2;
const int moveButtonPin = 4;
// const int ledPin = 11;

// variables will change:
int selectButtonState = 0;  // variable for reading the selecting pushbutton status
int moveButtonState = 0;  // variable for reading the moving pushbutton status
int selectTimesPressed = 0; // variable for detecting if user is on different screen
int moveTimesPressed = 0; // variable for detecting if user is on different screen
int lastSelectButtonState = LOW; // variable for pulsing
int lastMoveButtonState = LOW; // variable for pulsing

unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers

void setup() {
  // put your setup code here, to run once:
  display.begin( SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
  display.clearDisplay();
  display.display();

  pinMode(selectButtonPin, INPUT_PULLUP);
  pinMode(moveButtonPin, INPUT_PULLUP);
 
}
void loop() {
  display.fillRect(0,0,128,64,SSD1306_BLACK);
  display.setCursor(5,10); 
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE); 
  display.println("RTC Stuff");

  // delay(1000);
  selectButtonState = digitalRead(selectButtonPin);
  moveButtonState = digitalRead(moveButtonPin);

  // compare the buttonState to its previous state
  if (selectButtonState != lastSelectButtonState) {
    // if the state has changed, increment the counter
    if (selectButtonState == LOW) {
      // if the current state is HIGH then the button went from off to on:
      selectTimesPressed++;
    } 
    // Delay a little bit to avoid bouncing
    delay(50);
  }
  // save the current state as the last state, for next time through the loop
  lastSelectButtonState = selectButtonState;

  // check if the pushbutton is pressed. If it is, the selectButtonState is LOW:
  if (selectTimesPressed % 2 == 1) {
    /****************/
    /* DISPLAY MENU */
    /****************/

    // Select Box
    if (moveTimesPressed % 2 == 0) {
      display.fillRect(0,32,128,64,SSD1306_BLACK); // erase previous box
      display.fillRect(0,0,128,32,SSD1306_WHITE);
      display.fillRect(2,2,124,28,SSD1306_BLACK);
    } else {
        display.fillRect(0,0,128,32,SSD1306_BLACK); // erase previous box
        display.fillRect(0,32,128,64,SSD1306_WHITE);
        display.fillRect(2,34,124,60,SSD1306_BLACK);
    }

    
    // Staring Pomo Timer
    display.setCursor(5,10); 
    display.setTextSize(2);
    display.setTextColor(SSD1306_WHITE); 
    display.println("Start Pomo");

    // Set Pomo Timer
    display.setCursor(5,42); 
    display.setTextSize(2);
    display.setTextColor(SSD1306_WHITE); 
    display.println("Set Pomo");

  } 
  display.display();
}