#define BLYNK_TEMPLATE_NAME "Speed Encoder"
#define BLYNK_TEMPLATE_ID "TMPL3AhPfbKps"
#define BLYNK_AUTH_TOKEN "i0_iFnOIVnFZ8DA8EA-MC1qlZNcu61SX"

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <BlynkSimpleEsp32.h>

// WiFi/Blynk
char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Pins
#define CLK_PIN 16
#define DT_PIN 17
#define SW_PIN 5
#define POT_PIN 34

// Encoder variables
volatile int counter = 0;
int lastCLK = HIGH;
String currentDir = "STOP";
int lastButtonState = HIGH;
int lastPotValue = -1;

// ---------------- Setup ----------------
void setup() {
  Serial.begin(115200);

  // LCD
  Wire.begin(21, 22);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Starting...");

  // Encoder pins
  pinMode(CLK_PIN, INPUT_PULLUP);
  pinMode(DT_PIN, INPUT_PULLUP);
  pinMode(SW_PIN, INPUT_PULLUP);

  lastCLK = digitalRead(CLK_PIN);

  // Blynk
  Blynk.begin(auth, ssid, pass);

  delay(1000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Blynk Ready!");
}

// ---------------- Loop ----------------
void loop() {
  Blynk.run();
  readEncoder();
  readPotentiometer();
  readEncoderButton();
}

// ---------------- Encoder ----------------
void readEncoder() {
  int clkState = digitalRead(CLK_PIN);
  if (clkState != lastCLK) {
    // rising edge detected
    if (clkState == HIGH) {
      int dtState = digitalRead(DT_PIN);
      if (dtState != clkState) {
        counter++;        // CW
        currentDir = "CW";
      } else {
        counter--;        // CCW
        currentDir = "CCW";
      }

      // Serial debug
      Serial.print("Counter: ");
      Serial.print(counter);
      Serial.print(" Dir: ");
      Serial.println(currentDir);

      // LCD update (row 0)
      lcd.setCursor(0, 0);
      lcd.print("Enc: ");
      lcd.print(counter);
      lcd.print(" ");
      lcd.print(currentDir);
      lcd.print("   ");

      // Blynk
      Blynk.virtualWrite(V0, counter);
    }
  }
  lastCLK = clkState;
}

// ---------------- Potentiometer ----------------
void readPotentiometer() {
  int potValue = analogRead(POT_PIN);
  int mappedValue = map(potValue, 0, 4095, 0, 100);

  if (mappedValue != lastPotValue) {
    lcd.setCursor(0, 1);
    lcd.print("POT: ");
    lcd.print(mappedValue);
    lcd.print("%   ");
    lastPotValue = mappedValue;

    // Blynk
    Blynk.virtualWrite(V1, mappedValue);
  }
}

// ---------------- Encoder Button ----------------
void readEncoderButton() {
  int buttonState = digitalRead(SW_PIN);
  if (buttonState != lastButtonState) {
    if (buttonState == LOW) {
      counter = 0;
      currentDir = "STOP";

      lcd.setCursor(0, 0);
      lcd.print("Button Pressed!   ");

      Blynk.virtualWrite(V2, 1);
      delay(300); // debounce
    } else {
      Blynk.virtualWrite(V2, 0);
    }
  }
  lastButtonState = buttonState;
}