#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2

#define PIN_POT A2
#define PIN_BUT 7

// States
#define IDLE 0 // wachten / inactief
#define CHANGE_SCALE 1
#define BLANK_SCREEN 2

// Functions
void drawBar();

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

uint8_t char0[8] =  {0,  0,  0,  0,  0,  0,  0,  0 }; // 00000
uint8_t char1[8] =  {16, 16, 16, 16, 16, 16, 16, 16}; // 10000
uint8_t char2[8] =  {24, 24, 24, 24, 24, 24, 24, 24}; // 11000
uint8_t char3[8] =  {28, 28, 28, 28, 28, 28, 28, 28}; // 11100
uint8_t char4[8] =  {30, 30, 30, 30, 30, 30, 30, 30}; // 11110
uint8_t char5[8] =  {31, 31, 31, 31, 31, 31, 31, 31}; // 11111

byte aantalKol;
int oldPotVal = 0;
byte stateLcd = IDLE; // ik steek '0' in de state

void setup() {
  Serial.begin(9600);
  pinMode(A2, INPUT);
  // Init
  lcd.init();
  lcd.backlight();

  // Print something
  lcd.setCursor(2, 1);
  lcd.print("Wokwi Rocks!");

  lcd.createChar(0, char0);
  lcd.createChar(1, char1);
  lcd.createChar(2, char2);
  lcd.createChar(3, char3);
  lcd.createChar(4, char4);
  lcd.createChar(5, char5);
  lcd.begin(1, 0);
  /*
    lcd.print(char(0));
    lcd.print(char(1));
    lcd.print(char(2));
    lcd.print(char(3));
    lcd.print(char(4));
  */

}

void loop() {

  switch (stateLcd) {
    case IDLE: // 0 // wachten / inactief
      if (analogRead(PIN_POT) != oldPotVal) { 
        // achtergrondlicht aan
        stateLcd = CHANGE_SCALE;
        oldPotVal = analogRead(PIN_POT);
      }
      if (!digitalRead(PIN_BUT)) {
        stateLcd = BLANK_SCREEN;
      }
      break;

    case CHANGE_SCALE: // 1
      drawBar();
      stateLcd = IDLE;
      break;

    case BLANK_SCREEN: // 2
      lcd.clear();
      delay(30); // delay voor het bouncen op te vange
      stateLcd = IDLE;
      break;
    default:
      Serial.println("Error");
  }
}

void drawBar() {
  Serial.println(analogRead(A2)); // PIN_POT
  aantalKol = map(analogRead(PIN_POT), 0, 1023, 0, 80);
  lcd.setCursor(0, 0);
  for (int i = 0 ; i < aantalKol / 5 ; i++) {
    lcd.print(char(255));
  }
  lcd.print(char(aantalKol % 5));
  for (int i = aantalKol / 5 ; i < 16 ; i++) {
    lcd.print(char(254));
  }
}