#include <ESP8266WebServer.h>
#include <ESP8266HTTPClient.h>
#include <SPI.h>
#include <MFRC522.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define SS_PIN D4  // SDA / SS is connected to pinout D2
#define RST_PIN D3  // RST is connected to pinout D1
MFRC522 mfrc522(SS_PIN, RST_PIN);  // Create MFRC522 instance.

#define ON_Board_LED 2  
#define BUZZER_PIN D8  // Define the pin for the buzzer

const char* ssid = "Safirudin 3";
const char* password = "safirudin1234";

ESP8266WebServer server(80);  // Server on port 80

int readsuccess;
byte readcard[4];
char str[32] = "";
String StrUID;
String receivedData = "";
String newBalance = "";

// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Wire.begin();
  Serial.begin(115200); // Initialize serial communications with the PC
  SPI.begin();  // Init SPI bus
  mfrc522.PCD_Init(); // Init MFRC522 card

  delay(400);

  // Initialize the LCD
  lcd.begin(16, 2);
  lcd.clear();
  lcd.backlight();

  WiFi.begin(ssid, password); // Connect to your WiFi router
  Serial.println("");

  pinMode(ON_Board_LED, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);  // Set buzzer pin as output
  digitalWrite(ON_Board_LED, HIGH); // Turn off Led On Board
  digitalWrite(BUZZER_PIN, LOW);  // Ensure the buzzer is off initially

  Serial.print("Connecting");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    digitalWrite(ON_Board_LED, LOW);
    delay(250);
    digitalWrite(ON_Board_LED, HIGH);
    delay(250);
  }
  digitalWrite(ON_Board_LED, HIGH); // Turn off the On Board LED when it is connected to the wifi router.
  Serial.println("");
  Serial.print("Successfully connected to : ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  // Setup server routes
  server.on("/", HTTP_GET, handleRoot);
  server.begin();

  Serial.println("Please tag a card or keychain to see the UID !");
  Serial.println("");
}


void loop() {
  // Handle client requests
  server.handleClient();

  // Read RFID card
  readsuccess = getid();

  if (readsuccess) {
    digitalWrite(ON_Board_LED, LOW);
    digitalWrite(BUZZER_PIN, HIGH) ; //DO note 523 Hz
    delay (250);  // Turn on the buzzer
    digitalWrite(BUZZER_PIN, LOW) ;

    HTTPClient http;  // Declare object of class HTTPClient
    WiFiClient client;

    String UIDresultSend = StrUID;
    String postData = "UIDresult=" + UIDresultSend;

    http.begin(client, "http://192.168.171.31/Ridho/getUID.php");
    http.addHeader("Content-Type", "application/x-www-form-urlencoded"); // Specify content-type header

    int httpCode = http.POST(postData);  // Send the request
    String payload = http.getString();  // Get the response payload

    Serial.println(UIDresultSend);
    Serial.println(httpCode);  // Print HTTP return code
    Serial.println(payload);  // Print request response payload

    receivedData = payload;  // Store received data

    http.end();  // Close connection

    delay(2000);
    
    // Make a GET request to receive new balance data
    if (WiFi.status() == WL_CONNECTED) {
      http.begin(client, "http://192.168.171.31/Ridho/sendNewBalance.php");
      int httpCode = http.GET();
      Serial.println("HTTP GET code: " + String(httpCode));

      if (httpCode > 0) {
        if (httpCode == HTTP_CODE_OK) {
          newBalance = http.getString();
          Serial.println("New balance received: " + newBalance);

          // Parse newBalance to extract newName and dataBalance
          int separatorIndex = newBalance.indexOf('|');
          if (separatorIndex != -1) {
            String dataName = newBalance.substring(0, separatorIndex);
            String dataBalance = newBalance.substring(separatorIndex + 1);

            // Display data on LCD
            lcd.clear();
            lcd.setCursor(0, 0);
            lcd.print(dataName);

            lcd.setCursor(0, 1);
            lcd.print(dataBalance);
            delay(4000);
            lcd.clear();
          } else {
            Serial.println("Failed to parse response: no delimiter found");
          }
        } else {
          Serial.println("Failed to get new balance, response code: " + String(httpCode));
        }
      } else {
        Serial.printf("[HTTP] GET request failed, error: %s\n", http.errorToString(httpCode).c_str());
      }
      http.end();
    } else {
      Serial.println("WiFi not connected");
    }

    delay(250);
    digitalWrite(BUZZER_PIN, LOW);  // Turn off the buzzer
    digitalWrite(ON_Board_LED, HIGH);
  }
}

int getid() {
  if (!mfrc522.PICC_IsNewCardPresent()) {
    return 0;
  }
  if (!mfrc522.PICC_ReadCardSerial()) {
    return 0;
  }

  Serial.print("THE UID OF THE SCANNED CARD IS : ");

  for (int i = 0; i < 4; i++) {
    readcard[i] = mfrc522.uid.uidByte[i];  // Storing the UID of the tag in readcard
    array_to_string(readcard, 4, str);
    StrUID = str;
  }
  mfrc522.PICC_HaltA();
  return 1;
}

void array_to_string(byte array[], unsigned int len, char buffer[]) {
  for (unsigned int i = 0; i < len; i++) {
    byte nib1 = (array[i] >> 4) & 0x0F;
    byte nib2 = (array[i] >> 0) & 0x0F;
    buffer[i * 2 + 0] = nib1 < 0xA ? '0' + nib1 : 'A' + nib1 - 0xA;
    buffer[i * 2 + 1] = nib2 < 0xA ? '0' + nib2 : 'A' + nib2 - 0xA;
  }
  buffer[len * 2] = '\0';
}

void handleRoot() {
  server.send(200, "text/plain", receivedData);
}

// Function to scroll text on the LCD from right to left
void scrollText(String message) {
  message = "                " + message + "                ";  // Add spaces to the start and end for scrolling effect
  for (int i = 0; i < message.length() - 16; i++) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(message.substring(i, i + 16));  // Print a substring of the message
    delay(200);  // Delay to control the scroll speed
    lcd.clear();
  }
}