#include <Keypad.h>
#include <WiFi.h>
#include <LiquidCrystal_I2C.h>

// Define keypad configuration
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
 {'1', '2', '3', 'A'},
 {'4', '5', '6', 'B'},
 {'7', '8', '9', 'C'},
 {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {33, 25, 26, 14};
byte colPins[COLS] = {27, 13, 16, 4};

// Initialize keypad object
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// Initialize WiFi client and receiver details
WiFiClient client;
const char* receiverIP = "receiver_ip_address"; // Replace with actual IP
const int receiverPort = 8888;

// Define variables for current state of the system
String inputToken = ""; // Buffer for user input token
int currentToken = 0; // Current token being served

void setup() {
 // Initialize serial communication
 Serial.begin(115200);
 // Connect to WiFi network
 connectToWiFi();
}

void loop() {
 // Get key pressed from keypad
 char key = keypad.getKey();

 // Check if a key is pressed
 if (key) {
  // Check if the pressed key is 'A' for manual token entry
  if (key == 'A') { 
   // Transmit manually entered token and random counter number
   transmitData(inputToken.toInt(), random(1, 5)); // Random counter number between 1 and 4
   inputToken = ""; // Clear input token buffer
  } else if (key == 'B') { // Check if the pressed key is 'B' for token increment
   // Increment token and reset to 1 if it reaches 100
   currentToken = (currentToken % 100) + 1;
   // Transmit incremented token along with random counter number
   transmitData(currentToken, random(1, 5)); // Random counter number between 1 and 4
  } else if (isdigit(key) || key == '*') { // Check if the pressed key is a digit or '*'
   // Append numeric key press to input token buffer
   inputToken += key;
   // Print current input token for feedback
   Serial.println("Current input token: " + inputToken);
  } else { // Handle invalid key press
   Serial.println("Invalid key press!");
  }
 }
}

// Function to connect to WiFi network

//  int attempts = 0;
//  WiFi.begin("your_wifi_ssid", "your_wifi_password");
//  // Attempt to connect with exponential backoff
//  while (WiFi.status() != WL_CONNECTED && attempts < 5) {
//   delay(1000 * (attempts + 1)); // Exponential backoff
//   Serial.println("Connecting to WiFi...");
//   attempts++;
//  }
//  // Check if connection is successful
//  if (WiFi.status() != WL_CONNECTED) {
//   Serial.println("Failed to connect to WiFi.");
//  } else {
//   Serial.println("Connected to WiFi");
//  }

void connectToWiFi() {
   Serial.begin(9600);
  Serial.print("Connecting to WiFi");
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");
}

// Function to transmit data to receiver
void transmitData(int token, int counter) {
//  // Check if client is connected to WiFi
//  if (!client.connected()) {
//   // Attempt to reconnect if not connected
//   if (!client.connect(receiverIP, receiverPort)) {
//    Serial.println("Failed to connect to receiver.");
//    return;
//   }
//  }
 // Send data to receiver
 Serial.println("Counter " + String(counter) + ", Token " + String(token));
 client.print("Counter: ");
 client.print(counter);
 client.print(", Token: ");
 client.print(token);
 client.println();
}





// #include <Keypad.h>
// #include <WiFi.h>
// #include <LiquidCrystal_I2C.h>

// // Define keypad configuration
// const byte ROWS = 4;
// const byte COLS = 4;
// char keys[ROWS][COLS] = {
//  {'1', '2', '3', 'A'},
//  {'4', '5', '6', 'B'},
//  {'7', '8', '9', 'C'},
//  {'*', '0', '#', 'D'}
// };
// byte rowPins[ROWS] = {33, 25, 26, 14};
// byte colPins[COLS] = {27, 13, 22, 4};

// // Initialize keypad object
// Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// // Initialize WiFi client and receiver details
// WiFiClient client;
// const char* receiverIP = "receiver_ip_address"; // Replace with actual IP
// const int receiverPort = 8888;

// // Define variables for current state of the system
// String inputToken = ""; // Buffer for user input token
// int currentToken = 0; // Current token being served

// // Initialize LCD object
// LiquidCrystal_I2C lcd(0x27, 16, 2); // Address 0x27, 16 columns, 2 rows

// void setup() {
//  // Initialize serial communication
//  Serial.begin(115200);
//  // Connect to WiFi network
//  connectToWiFi();

//  // Initialize LCD
//  lcd.init();
//  lcd.backlight(); // Turn on backlight
//  lcd.clear(); // Clear the display
// }

// void loop() {
//  // Get key pressed from keypad
//  char key = keypad.getKey();

//  // Check if a key is pressed
//  if (key) {
//   // Check if the pressed key is 'A' for manual token entry
//   if (key == 'A') { 
//    // Transmit manually entered token and random counter number
//    transmitData(inputToken.toInt(), random(1, 5)); // Random counter number between 1 and 4
//    inputToken = ""; // Clear input token buffer
//   } else if (key == 'B') { // Check if the pressed key is 'B' for token increment
//    // Increment token and reset to 1 if it reaches 100
//    currentToken = (currentToken % 100) + 1;
//    // Transmit incremented token along with random counter number
//    transmitData(currentToken, random(1, 5)); // Random counter number between 1 and 4
//   } else if (isdigit(key) || key == '*') { // Check if the pressed key is a digit or '*'
//    // Append numeric key press to input token buffer
//    inputToken += key;
//    // Print current input token for feedback
//    Serial.println("Current input token: " + inputToken);
//   } else { // Handle invalid key press
//    Serial.println("Invalid key press!");
//   }
//  }
// }

// // Function to connect to WiFi network
// void connectToWiFi() {
//  Serial.begin(9600);
//  Serial.print("Connecting to WiFi");
//  WiFi.begin("Wokwi-GUEST", "", 6);
//  while (WiFi.status() != WL_CONNECTED) {
//   delay(100);
//   Serial.print(".");
//  }
//  Serial.println(" Connected!");
// }

// // Function to transmit data to receiver
// void transmitData(int token, int counter) {
//  // Send data to receiver
//  Serial.println("Counter " + String(counter) + ", Token " + String(token));
//  client.print("Counter: ");
//  client.print(counter);
//  client.print(", Token: ");
//  client.print(token);
//  client.println();

//  // Display data on LCD
//  lcd.setCursor(0, 0); // Set cursor to the first column of the first row
//  lcd.print("Counter: ");
//  lcd.print(counter);
//  lcd.setCursor(0, 1); // Set cursor to the first column of the second row
//  lcd.print("Token: ");
//  lcd.print(token);
// }


// #include <Keypad.h>
// #include <WiFi.h>
// #include <LiquidCrystal_I2C.h>

// // Define keypad configuration
// const byte ROWS = 4;
// const byte COLS = 4;
// char keys[ROWS][COLS] = {
//  {'1', '2', '3', 'A'},
//  {'4', '5', '6', 'B'},
//  {'7', '8', '9', 'C'},
//  {'*', '0', '#', 'D'}
// };
// byte rowPins[ROWS] = {33, 25, 26, 14};
// byte colPins[COLS] = {27, 13, 22, 4};

// // Initialize keypad object
// Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// // Initialize WiFi client and receiver details
// WiFiClient client;
// const char* receiverIP = "receiver_ip_address"; // Replace with actual IP
// const int receiverPort = 8888;

// // Define variables for current state of the system
// String inputToken = ""; // Buffer for user input token
// int currentToken = 0; // Current token being served

// // Initialize LCD object
// LiquidCrystal_I2C lcd(0x27, 16, 2); // Address 0x27, 16 columns, 2 rows

// void setup() {
//  // Initialize serial communication
//  Serial.begin(115200);
//  // Connect to WiFi network
//  connectToWiFi();

//  // Initialize LCD
//  lcd.init();
//  lcd.backlight(); // Turn on backlight
//  lcd.clear(); // Clear the display
// }

// void loop() {
//  // Get key pressed from keypad
//  char key = keypad.getKey();

//  // Check if a key is pressed
//  if (key) {
//   // Check if the pressed key is 'A' for manual token entry
//   if (key == 'A') { 
//    // Transmit manually entered token and random counter number
//    transmitData(inputToken.toInt(), random(1, 5)); // Random counter number between 1 and 4
//    inputToken = ""; // Clear input token buffer
//   } else if (key == 'B') { // Check if the pressed key is 'B' for token increment
//    // Increment token and reset to 1 if it reaches 100
//    currentToken = (currentToken % 100) + 1;
//    // Transmit incremented token along with random counter number
//    transmitData(currentToken, random(1, 5)); // Random counter number between 1 and 4
//   } else if (isdigit(key) || key == '*') { // Check if the pressed key is a digit or '*'
//    // Append numeric key press to input token buffer
//    inputToken += key;
//    // Print current input token for feedback
//    Serial.println("Current input token: " + inputToken);
//   } else { // Handle invalid key press
//    Serial.println("Invalid key press!");
//   }
//  }
// }

// // Function to connect to WiFi network
// void connectToWiFi() {
//  Serial.begin(9600);
//  Serial.print("Connecting to WiFi");
//  WiFi.begin("Wokwi-GUEST", "", 6);
//  while (WiFi.status() != WL_CONNECTED) {
//   delay(100);
//   Serial.print(".");
//  }
//  Serial.println(" Connected!");
// }

// // Function to transmit data to receiver
// void transmitData(int token, int counter) {
//  // Send data to receiver
//  Serial.println("Counter " + String(counter) + ", Token " + String(token));
//  client.print("Counter: ");
//  client.print(counter);
//  client.print(", Token: ");
//  client.print(token);
//  client.println();

//  // Display data on LCD
//  lcd.setCursor(0, 0); // Set cursor to the first column of the first row
//  lcd.print("Counter: ");
//  lcd.print(counter);
//  lcd.setCursor(0, 1); // Set cursor to the first column of the second row
//  lcd.print("Token: ");
//  lcd.print(token);
// }