#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <SoftwareSerial.h>
#include <Encoder.h>
#include <Bounce2.h>

// LCD and RS-232 configurations
LiquidCrystal_I2C lcd(0x27, 20, 4); // I2C address, 20 columns, 4 rows
SoftwareSerial rs232(2, 3); // RX, TX pins for RS-232 communication

// Rotary encoder setup
Encoder myEncoder(4, 5); // Rotary encoder pins (A and B)

// Baud rates for RS-232 communication
int baudRates[] = {9600, 1200, 2400, 4800, 19200, 38400, 57600, 115200};
int selectedBaudRate = 0; // Default to 9600 baud

// Global variable to store the current mode
int currentMode = 0; // 0 = Send mode, 1 = Receive mode

// Push button setup using the Bounce2 library
const int buttonPin = 6; // Use pin 6 for the push button
Bounce debouncer = Bounce(); // Create a Bounce object
bool buttonPressed = false; // Track button press state

void setup() {
  Serial.begin(9600);
  rs232.begin(baudRates[selectedBaudRate]);

  // Initialize the LCD
  lcd.init();
  lcd.backlight();
  lcd.clear();

  // Initialize the push button with debouncing
  pinMode(buttonPin, INPUT_PULLUP);
  debouncer.attach(buttonPin);
  debouncer.interval(50); // Debounce interval in milliseconds
}

void loop() {
  // Update the debouncer
  debouncer.update();
  
  // Check if the button was pressed and released
  if (debouncer.fell()) {
    buttonPressed = true;
  }
  
  // Check if the button was released after being pressed
  if (debouncer.rose() && buttonPressed) {
    // Toggle between Send and Receive modes
    currentMode = 1 - currentMode;
    displayMode();
    buttonPressed = false; // Reset the button press state
  }

  // Perform actions based on the current mode
  if (currentMode == 0) {
    sendMode();
  } else if (currentMode == 1) {
    receiveMode();
  }
}

// Send mode: send out the phrase "Testing Testing 123456"
void sendMode() {
  lcd.home();
  lcd.println("Send Mode");
  delay(1500); // Display mode for 1500 ms
  lcd.clear();
  lcd.home();
  lcd.print("Testing");
  delay(500);
  lcd.clear();
  delay(200);
  Serial.flush();
  Serial.println("Testing");
  Serial.flush();
  delay(500);
}

// Receive mode: read data from the serial port and print it to the LCD
void receiveMode() {
  lcd.home();
  lcd.println("Receive Mode");
  delay(1500); // Display mode for 1500 ms
  lcd.clear();
  if (Serial.available()) {
    char incomingData = Serial.read();
    lcd.home();
    lcd.println(incomingData);
    Serial.flush();
    delay(500);
    Serial.println(incomingData);
    Serial.flush();
    delay(500);
  } else {
    lcd.home();
    lcd.println("Waiting");
    delay(500);
    lcd.clear();
    delay(200);
    Serial.flush();
    delay(500);
    Serial.println("Waiting");
    Serial.flush();
    delay(500);
  }
}

void displayMode() {
  lcd.home();
  if (currentMode == 0) {
    lcd.println("Send Mode");
  } else if (currentMode == 1) {
    lcd.println("Receive Mode");
  }
  delay(1500); // Display mode for 1500 ms
  lcd.clear();
}