#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Set the LCD address (0x27 is common in Wokwi, adjust if needed)
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Custom block character for meter
byte blockChar[8] = {
  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};

// Rotary Encoder pins for Raspberry Pi Pico in Wokwi
const int pinCLK = 6;  // GP6
const int pinDT = 7;   // GP7
const int pinSW = 8;   // GP8

long counter = 0; // Use long to prevent overflow
int lastStateCLK;

void setup() {
  // Initialize pins with internal pull-ups
  pinMode(pinCLK, INPUT_PULLUP);
  pinMode(pinDT, INPUT_PULLUP);
  pinMode(pinSW, INPUT_PULLUP);
  lcd.print("OOOOOOOOOOOOOO");

  // Initialize I2C communication (Wokwi uses default I2C0: SDA=GP4, SCL=GP5)
  Wire.begin();

  // Initialize the LCD
  lcd.init();
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.createChar(0, blockChar); // Create custom block character for meter

  // Display initial message
  lcd.setCursor(0, 0);
  lcd.print("Rotary Meter:");

  // Read initial state of the rotary encoder
  lastStateCLK = digitalRead(pinCLK);
}

void loop() {
  int currentStateCLK = digitalRead(pinCLK);

  if (currentStateCLK != lastStateCLK) {
    if (digitalRead(pinDT) != currentStateCLK) {
      counter++; // Clockwise
    } else {
      counter--; // Counterclockwise
    }
    drawMeter(counter); // Update LCD with rotary encoder data
  }

  lastStateCLK = currentStateCLK;

  // Reset counter on switch press
  if (digitalRead(pinSW) == LOW) {
    counter = 0;
    drawMeter(counter);
    delay(200); // Debounce switch
  }

  delay(5); // Debounce delay for rotary encoder
}

void drawMeter(long value) {
  // Show raw value on top line
  lcd.setCursor(0, 0);
  lcd.print("Rotary Meter:    "); // Clear old text
  lcd.setCursor(0, 0);
  lcd.print("Rotary Meter: ");
  lcd.print(value);

  // Show meter bar on second line
  lcd.setCursor(0, 1);
  const int meterLength = 16;
  int valMod = value % 100;
  if (valMod < 0) valMod += 100;

  int blocks = map(valMod, 0, 100, 0, meterLength);
  for (int i = 0; i < meterLength; i++) {
    if (i < blocks) {
      lcd.write((uint8_t)0); // Custom block character
    } else {
      lcd.print("_");
    }
  }
}