#define BLYNK_PRINT Serial
#define BLYNK_TEMPLATE_ID "TMPL2jBGxfz2c"
#define BLYNK_TEMPLATE_NAME "hospital ward access control"
#define BLYNK_AUTH_TOKEN "Qr8R4g7B8HPqaEK21eb9l6KhzLYNXhUM"
char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

#include <SPI.h> 
#include <MFRC522.h> 
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>
#include <DFRobotDFPlayerMini.h>
#include <BlynkSimpleEsp32.h>
#include <WiFi.h>
#include <WiFiClient.h>

#define  SS   5
#define  RST  14
#define  rled   26
#define  bled   25
#define  BUTTON_PIN 4
#define  servoPin 13
#define  NTP_SERVER     "pool.ntp.org"
#define  UTC_OFFSET     3*3600
#define  UTC_OFFSET_DST 0
#define buzzer 15
#define movePin  27

struct Student {
  String tag;     // RFID tag (UID as string)
  String name;    // Full name
  bool inside;         // false = outside, true = inside the bus
};

Student students[10] = {
  {"A1B2C3D4", "Alice Johnson", false},
  {"B2C3D4E5", "Brian Smith", false},
  {"C3D4E5F6", "Carla Mendes", false},
  {"D4E5F6G7", "David Kim", false},
  {"E5F6G7H8", "Emily White", false},
  {"F6G7H8I9", "Frank Lee", false},
  {"G7H8I9J0", "Grace Chen", false},
  {"H8I9J0K1", "Henry Black", false},
  {"I9J0K1L2", "Ivy Brown", false},
  {"J0K1L2M3", "Jacob Green", false}
};

float latitude,longitude,speed;
bool isMoving;

LiquidCrystal_I2C lcd(0x27, 20, 4);
MFRC522 scanner(SS,RST);
DFRobotDFPlayerMini myDFPlayer;
Servo myServo;

void setup() {
  Serial.begin(9600);
  delay(500);
  Serial.println("initializing");
  pinMode(rled, OUTPUT);
  pinMode(bled, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(movePin,INPUT);
  pinMode(32,INPUT_PULLDOWN);
  lcd.init();
  lcd.backlight();
  loadingdisplay();
  clearLine(3);
  clearLine(3);
  lcd.setCursor(0, 3);
  lcd.print("Connecting  WiFi....");
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
    spinner();
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  clearLine(3);
  lcd.setCursor(0, 3);
  lcd.print("WiFi connected");
  delay(2000);

  clearLine(3);
  lcd.setCursor(0, 3);
  lcd.print("Updating time...");
  configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);
  clearLine(3);
  lcd.setCursor(0, 3);
  lcd.print("Time Updated");
  delay(2000);

  clearLine(3);
  lcd.setCursor(0, 3);
  lcd.print("Initialize voice...");
  Serial2.begin(9600);
  
  clearLine(3);
  lcd.setCursor(0, 3);
  lcd.print("Voice Initialized");
  delay(2000);
  Blynk.begin(auth, ssid, pass);
  myServo.attach(servoPin);
  myServo.write(0);
  Serial.println("Type RFID Tag ID to scan a product...");
  lcd.clear();
}

void loop() 
{
  isMoving=digitalRead(movePin);
  homedisplay();
  while(digitalRead(movePin)==LOW)
  {
    allowScan();
  }
if(digitalRead(32))
    {
      handDetected();
    }
  
}

void allowScan()
{
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("SCAN FOR DOOR ACCESS");
  lcd.setCursor(0, 3);
  lcd.print("  TO GET IN OR OUT  ");
  if (Serial.available()) {
    String inputTag = Serial.readStringUntil('\n');
    inputTag.trim();
    bool found = false;
    for (int i = 0; i < 10; i++) {
      if (students[i].tag == inputTag) {
        found = true;
        Serial.println("Card found: " + students[i].name);
        Serial.println("Opening door....");
        grantAlert(i);
        delay(3000);
        grant();
        break;
      }
    }
    if (!found) {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("UNKNOW/UNREGISTERED");
      lcd.setCursor(0, 1);
      lcd.print(" STUDENT ID CARD  ");
      lcd.setCursor(0, 2);
      lcd.print("CONTACT SCHOOL");
      lcd.setCursor(0, 3);
      lcd.print(" FOR PROBLEM DETAIL ");
      Serial.println("Tag not recognized!");
      delay(2000);
    }
  }delay(500);
}

void loadingdisplay()
{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("*SUCURE ACCESS FOR *"); 
  lcd.setCursor(0,1);
  lcd.print("* SMART SHOOL BUS  *"); 
  lcd.setCursor(0,2);
  lcd.print(" SYSTEM INITIALIZE ");
  lcd.setCursor(0,3);
  lcd.print("PLEASE WAIT");
  for(int k=11;k<20;k++)
  {
    lcd.setCursor(k,3);
    lcd.print(".");
    delay(200);
  }
}

void homedisplay()
{
  lcd.setCursor(0,0);
  lcd.print("*SUCURE ACCESS FOR *"); 
  lcd.setCursor(0,1);
  lcd.print("* SMART SCHOOL BUS *");  
  lcd.setCursor(0,2);
  if(!isMoving)
  {
  lcd.print("ARRIVED AT STATION"); 
  } 
  else
  {
  lcd.print("  BUS IN MOTION   "); 
  } 
}

void alert_display(String textAlert)
{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(" -EMERGENCY ALERT-  ");
  lcd.setCursor(0,1);
  lcd.print("********************");
  lcd.setCursor(0,2);
  lcd.print("*");
  lcd.setCursor(1,2);
  lcd.print(textAlert);
  lcd.setCursor(19,2);
  lcd.print("*");
  lcd.setCursor(0,3);
  lcd.print("********************");
  //myDFPlayer.play(2);
}

void Alert(uint8_t num)
{
  for(uint8_t q=0;q<num;q++){
  digitalWrite(buzzer, HIGH);
  digitalWrite(rled, HIGH);
  tone(buzzer, 100);
  delay(1000);
  digitalWrite(buzzer, LOW);
  digitalWrite(rled, LOW);
  noTone(buzzer);
  delay(1000);}
}

void clearLine(uint8_t lineNum)
{
  for(uint8_t i=0;i<20;i++)
  {
    lcd.setCursor(i,lineNum);
    lcd.print(" ");
  }
}

void printLocalTime() {
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    lcd.setCursor(0, 3);
    lcd.print("Connection Err");
    return;
  }
  lcd.setCursor(0,3);
  lcd.print(&timeinfo, "%H:%M:%S  %d/%m/%Y");
}

void spinner() 
{
  static int8_t counter = 0;
  const char* glyphs = "\xa1\xa5\xdb";
  lcd.setCursor(19, 3);
  lcd.print(glyphs[counter++]);
  if (counter == strlen(glyphs)) {
    counter = 0;
  }
}

void grant()
{
  myServo.write(180);
  delay(3000);
  myServo.write(90);
}

void grantAlert(int p)
{
  lcd.setCursor(0,0);
  lcd.print("Hi! "+students[p].name); 
  lcd.setCursor(0,1);
  lcd.print("  YOU ARE WELCOME   ");  
  lcd.setCursor(0,2);
  if(!students[p].inside){lcd.print("PLEASE! GET INSIDE");  }
  else{       lcd.print("PLEASE! DISEMBARK ");  }
  lcd.setCursor(0,3);
  lcd.print("--------------------"); 
}

void denyAlert()
{
  lcd.setCursor(0,0);
  lcd.print("--------------------"); 
  lcd.setCursor(0,1);
  lcd.print("| SORRY! YOUR CARD |");  
  lcd.setCursor(0,2);
  lcd.print("|HAS BEEN REJECTED |");  
  lcd.setCursor(0,3);
  lcd.print("--------------------"); 
}

void handDetected()
{
  lcd.setCursor(0,0);
  lcd.print("--------------------"); 
  lcd.setCursor(0,1);
  lcd.print("| HAND DETECTED OUT |");  
  lcd.setCursor(0,2);
  lcd.print("| THE SIDE WINDOW   |");  
  lcd.setCursor(0,3);
  lcd.print("--------------------"); 
  Alert(4);
}