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

// LCD setup
LiquidCrystal_I2C lcd(0x27, 20, 4); // I2C address 0x27, 20 columns, 4 rows

// Rotary Encoder pins
#define CLK 4
#define DT 3
#define SW 2

// RGB LED pins
#define RED_PIN 5
#define GREEN_PIN 6
#define BLUE_PIN 9

int led_onoff = 1;

static int oldCLK = LOW;
static int oldDT = LOW;

int RED, GREEN, BLUE;
int INTERVEL, DURATION;

int mr, mg, mb, mi, md;

char buf[20];

int mode = 0;
int menu = 0;

int encoderValue = 0;
int lastCLK = HIGH;

void setup() {
  // Initialize the LCD
  lcd.begin(20, 4);
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Encoder Value:");

  // Rotary encoder setup
  pinMode(CLK, INPUT);
  pinMode(DT, INPUT);
  pinMode(SW, INPUT_PULLUP); // Button with internal pull-up resistor

  // RGB LED setup
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);

  // Initial RGB LED color
  setLEDColor(0, 0, 255); // Start with Blue
}

void loop() {
  // Read the rotary encoder
  int currentCLK = digitalRead(CLK);
  if (currentCLK != lastCLK) {
    if (digitalRead(DT) != currentCLK) {
      encoderValue++; // Clockwise rotation
    } else {
      encoderValue--; // Counter-clockwise rotation
    }
    updateLCD();
    updateLED();
  }
  lastCLK = currentCLK;

  // Reset value with the button
  if (digitalRead(SW) == LOW) {
    encoderValue = 0;
    updateLCD();
    updateLED();
    delay(200); // Debounce delay
  }
}

void updateLCD() {
  lcd.setCursor(0, 1);
  lcd.print("Value: ");
  lcd.print(encoderValue);
  lcd.print("    "); // Clear remaining characters
}

void updateLED() {
  // Change RGB LED color based on encoder value
  int red = map(encoderValue, 0, 100, 0, 255);  // Map value to red intensity
  int green = map(encoderValue, 100, 200, 0, 255); // Map value to green intensity
  int blue = map(encoderValue, 200, 300, 0, 255);  // Map value to blue intensity
  setLEDColor(red, green, blue);
}

void setLEDColor(int red, int green, int blue) {
  analogWrite(RED_PIN, constrain(red, 0, 255));
  analogWrite(GREEN_PIN, constrain(green, 0, 255));
  analogWrite(BLUE_PIN, constrain(blue, 0, 255));
}