#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4
int cases;
int _sw1 = 12;
int _sw2 = 13;
int sw1,sw2,g,r;

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

void lcd_show() {
  switch(cases) {
    case 0:
      lcd.clear();
      lcd.print(">Options 1");
      lcd.setCursor(0,1);
      lcd.print(" Options 2");
      lcd.setCursor(0,2);
      lcd.print(" Options 3");
      lcd.setCursor(0,3);
      lcd.print(" Options 4");
      delay(500);
      break;
    case 1:
      lcd.clear();
      lcd.print(" Options 1");
      lcd.setCursor(0,1);
      lcd.print(">Options 2");
      lcd.setCursor(0,2);
      lcd.print(" Options 3");
      lcd.setCursor(0,3);
      lcd.print(" Options 4");
      delay(500);
      break;
    case 2:
      lcd.clear();
      lcd.print(" Options 1");
      lcd.setCursor(0,1);
      lcd.print(" Options 2");
      lcd.setCursor(0,2);
      lcd.print(">Options 3");
      lcd.setCursor(0,3);
      lcd.print(" Options 4");
      delay(500);
      break;
    case 3:
      lcd.clear();
      lcd.print(" Options 1");
      lcd.setCursor(0,1);
      lcd.print(" Options 2");
      lcd.setCursor(0,2);
      lcd.print(" Options 3");
      lcd.setCursor(0,3);
      lcd.print(">Options 4");
      break;
    case 4:
      cases = 3;
      break;
  }
}

uint8_t left_region[] = {
  0b00011,
  0b00010,
  0b00010,
  0b00010,
  0b00010,
  0b00010,
  0b00010,
  0b00011,
};

uint8_t right_region[] = {
  0b11000,
  0b01000,
  0b01000,
  0b01000,
  0b01000,
  0b01000,
  0b01000,
  0b11000,
};

uint8_t blank_bar[] = {
  0b11111,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b11111
};

uint8_t filled_bar[] = {
  0b11111,
  0b00000,
  0b11111,
  0b11111,
  0b11111,
  0b11111,
  0b00000,
  0b11111
};

void loading() {
  lcd.begin(20,4);
  lcd.setCursor(5,0);
  lcd.print("Loading. .");
  lcd.setCursor(3,1);
  lcd.print("\1\3\3\3\3\3\3\3\3\3\3\3\3");
  lcd.setCursor(16,1);
  lcd.print("\2");
  
  for (int l = 0; l <= 11; l++) {
    delay(300);
    lcd.setCursor(l+4,1);
    lcd.print("\4");   
  }
}

void setup() {
  Serial.begin(9600);
  DDRB = 0;
  PORTB = 0;
  lcd.init();
  lcd.backlight();
  lcd.createChar(1 , left_region);
  lcd.createChar(2 , right_region);
  lcd.createChar(3 , blank_bar);
  lcd.createChar(4 , filled_bar);
  loading();
  delay(800);
  lcd.clear();
}


void loop() {
  g = digitalRead(_sw1);
  r = digitalRead(_sw2);
  if (cases < 0) {
      cases = 0;
    }
  if (g != sw1) {
    sw1 = g;
    cases++;
  }

  if (r != sw2) {
    sw2 = r;
    cases--;
  }
  delay(120);
  lcd_show();
  Serial.println(cases);
}