#include "SevSeg.h"
#include <Wire.h> // Include Wire library for I2C communication
#include <LiquidCrystal_I2C.h> // Include library for I2C LCD

#define SEG_A 2
#define SEG_B 3
#define SEG_C 4
#define SEG_D 5
#define SEG_E 6
#define SEG_F 7
#define SEG_G 8

#define NUM_DIGITS 1
#define DIGIT1_PIN 10
#define POTENTIOMETER_PIN A0

SevSeg sevseg;
int previousValue = -1;
int frozenValue = -1;

LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27 for a 16x2 display
int receivedNumber = 0; // Variable to store the received number from Arduino R

void receiveEvent(int numBytes) {
  if (numBytes == 1) {
    receivedNumber = Wire.read(); // Read the received number
  }
}

void setup() {
  byte numDigits = NUM_DIGITS;
  byte digitPins[] = {DIGIT1_PIN};
  byte segmentPins[] = {SEG_A, SEG_B, SEG_C, SEG_D, SEG_E, SEG_F, SEG_G};
  bool resistorsonSegments = true;

  sevseg.begin(COMMON_CATHODE, numDigits, digitPins, segmentPins, resistorsonSegments);
  sevseg.setBrightness(100);
  Serial.begin(9600);
  
  Wire.begin(); // Initialize I2C communication
  
  lcd.init(); // Initialize the LCD
  lcd.backlight(); // Turn on the backlight
  Wire.begin(8); // Set Arduino D as slave with address 8
  Wire.onReceive(receiveEvent); // Register the receive event
}

void loop() {
  int analogValue = analogRead(POTENTIOMETER_PIN);
  int outputValue = map(analogValue, 0, 1023, -1, 9);

  if (outputValue < previousValue) {
    sevseg.setChars("-");
    sevseg.refreshDisplay();
    delay(500);
    // Send the output value via I2C
    Wire.beginTransmission(8); // Address of Arduino D
    Wire.write(outputValue);
    Wire.endTransmission();
  }

  if (outputValue == -1) {
    sevseg.setChars("-");
    sevseg.refreshDisplay();
    frozenValue = previousValue;
    Serial.print("Previous frozen value: ");
    Serial.println(frozenValue);
    Serial.println(frozenValue);
  }

  if (outputValue != -1 && outputValue > previousValue) {
    sevseg.setNumber(outputValue);
    sevseg.refreshDisplay();
  }

  previousValue = outputValue;
  
  // Display the received number on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Received Number:");
  lcd.setCursor(0, 1);
  lcd.print(receivedNumber);

  // Wait for 0.25 seconds
  delay(250);

  // Display the output from the "Warm-up Coding Problem" on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Warm-up Output:");
  lcd.setCursor(0, 1);
  lcd.print("YOUR_OUTPUT_HERE"); // Replace "YOUR_OUTPUT_HERE" with the actual output
  delay(2000); // Wait for 2 seconds before repeating the process
}