#include <SPI.h>
#include <MFRC522.h> // Library for RFID Reader
#include <Wire.h>
#include <LiquidCrystal_I2C.h> // Library for LCD I2C
#include <Servo.h> // Library for Servo Motor
#include <Keypad.h>

Servo servo;
int servoPos = 30;

#define innerSensorPin 2
#define buzzerPin 6
int gateSensorPin = 3; //IR sensor on gate to arduino pin 3

int innerSensor = 0;
int outerSensor = 0;

#define RST_PIN 9
#define SS_PIN 10

int card1Balance = 5000;
int card2Balance = 300;

#define num 7
char Data[num];
byte data_count = 0;

String num1, num2, card, card2;
int a, b;
char Key;

bool recharge = false; // default recharge false
bool paid = false; // to tell that the default is not paid

int slot1 = 5;   //#1 slot parking
int slot2 = 4;   //#2 Slot parking

LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
MFRC522 mfrc522(SS_PIN, RST_PIN);

char keys[ROWS][COLS] = {
  {'1','2','3'},
  {'4','5','6'},
  {'7','8','9'},
  {'#','0','*'}
};
byte rowPins[4] = {A5, A4, A3, A2}; //connect to the row pinouts of the keypad
byte colPins[3] = {A1, A0, 7}; //connect to the column pinouts of the keypad

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, 4, 3 );

void setup () {
  servo.attach(8);

  servo.write(30);
  pinMode(slot1,INPUT);  //setting slot pins  & gate IR sensor as input to arduino
  pinMode(slot2,INPUT);
  pinMode(gateSensorPin,INPUT);
  Serial.begin(9600);       //initialzing Serial monitor

  lcd.begin(16, 2);
  pinMode(innerSensorPin, INPUT);
  pinMode(buzzerPin, OUTPUT);

  SPI.begin();
  mfrc522.PCD_Init();

  lcd.setCursor(0, 0);
  lcd.print("Automatic Toll");
  lcd.setCursor(0, 1);
  lcd.print("colection system");
  delay(3000);
}
void loop()
{
 //the car arrives and sensor goes LOW

  if(!(digitalRead(gateSensorPin)) && digitalRead(slot1) && digitalRead(slot2))   //slot1 & slot2 empty
  {
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Available:");  //print slot1 and slo2 available
    lcd.setCursor(0,1);
    lcd.print("Slot1, Slot2");  //print slot1 and slo2 available
    delay(1000);
  }
  else if( !(digitalRead(gateSensorPin)) && !(digitalRead(slot1)) && digitalRead(slot2))  //car on slot1,slot2 free
  {
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Available:");  //print slot1 and slo2 available
    lcd.setCursor(0,1);
    lcd.print("Slot2");  //print slot1 and slo2 available
    delay(1000);
  }
  else if( !(digitalRead(gateSensorPin)) && digitalRead(slot1) && !(digitalRead(slot2)))     //car on slot2,slot1 free
  {
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Available:");  //print slot1 and slo2 available
    lcd.setCursor(0,1);
    lcd.print("Slot1");  //print slot1 and slo2 available
    delay(1000);
  }
  else if( !(digitalRead(gateSensorPin)) && !(digitalRead(slot1)) && !(digitalRead(slot2)))
  {
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Available:");  //print slot1 and slo2 available
    lcd.setCursor(0,1);
    lcd.print("Parking is Full");  //print slot1 and slo2 available
    delay(1000);
  }
  else if( digitalRead(gateSensorPin))  //no input detected
  {
    lcd.clear();
    Serial.println("Welcome");
    delay(1000);
  }
  if (recharge)
  {
    reCharge();
  }
  else{
    if((digitalRead(slot1)) || (digitalRead(slot2))){
      sensorRead();
      check_RFID();
      KeyPad();
      if (innerSensor == 0) // if there's a vehicle inside
      {
        servo.write(30);
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Vehicle detected");
        delay(1000);
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Put your card to");
        lcd.setCursor(0, 1);
        lcd.print("the reader......");
        delay(2000);
        lcd.clear();

      }
      else if (outerSensor == 0 && paid) // if there's a vehicle at the gate and paid
      {
        servo.write(120);
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Have a safe");
        lcd.setCursor(0, 1);
        lcd.print("journey");
        delay(1000);
        lcd.clear();
        paid = false;
      }
    }
  }
}

void sensorRead()
{
  innerSensor = digitalRead(innerSensorPin);
  outerSensor = digitalRead(gateSensorPin);
}

void check_RFID()
{
  if ( ! mfrc522.PICC_IsNewCardPresent())
  {
    return;
  }
  if ( ! mfrc522.PICC_ReadCardSerial())
  {
    return;
  }

  String content = "";
  for (byte i = 0; i < mfrc522.uid.size; i++)
  {
    content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
    content.concat(String(mfrc522.uid.uidByte[i], HEX));
  }
  content.toUpperCase();

  if (content.substring(1) == "D3 D0 E4 24")
  {
    if (card1Balance >= 500)
    {
      successfullyPaid();
      card1Balance = card1Balance - 500;
      lcd.setCursor(9, 1);
      lcd.print(card1Balance);
      delay(2000);
      lcd.clear();
      paid = true;
    }
    else
    {
      card = content.substring(1);
      failToPay();
      lcd.setCursor(9, 1);
      lcd.print(card1Balance);
      lcd.print(" Tk");
      delay(2000);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Please Recharge");
      delay(1000);
      lcd.clear();
      paid = false;
    }
  }
  else if (content.substring(1) == "E3 06 19 D3")
  {
    if (card2Balance >= 500)
    {
      successfullyPaid();
      card2Balance = card2Balance - 500;
      lcd.setCursor(9, 1);
      lcd.print(card2Balance);
      delay(2000);
      lcd.clear();
      paid = true;
    }
    else
    {
      card = content.substring(1);
      failToPay();
      lcd.setCursor(9, 1);
      lcd.print(card2Balance);
      lcd.print(" Tk");
      delay(2000);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Please Recharge");
      lcd.clear();
      delay(1000);
      paid = false;
    }
  }
  else{
    digitalWrite(buzzerPin, HIGH);
    lcd.setCursor(0, 0);
    lcd.print("Unknown Vehicle");
    lcd.setCursor(0, 1);
    lcd.print("Access denied");
    delay(1500);
    lcd.clear();
    digitalWrite(buzzerPin, LOW);
  }
}

void KeyPad()
{
  byte KState = Keypad.getState();

  if (KState == PRESSED)
  {
    Key = Keypad.getKey();
    if (Key)
    {
      if (Key == '*')
      {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Recharging Mode.");
        lcd.setCursor(0, 1);
        lcd.print("................");
        delay(1500);
        lcd.clear();
        recharge = true;
      }
    }
  }
}

void clearData()
{
  while (data_count != 0)
  {
    Data[data_count--] = 0;
  }
  return;
}

void reCharge()
{

  lcd.setCursor(0, 0);
  lcd.print ("Enter the amount");

  byte KState = Keypad.getState();

  if (KState == PRESSED)
  {
    Key = Keypad.getKey();
    if (Key)
    {
      if (Key == '#')
      {
        if (card == "D3 D0 E4 24")
        {
          num1 = Data;
          card1Balance = num1.toInt() + card1Balance;
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("Your current");
          lcd.setCursor(0, 1);
          lcd.print("balance: ");
          lcd.setCursor(9, 1);
          lcd.print (card1Balance);
          lcd.print(" Tk");
          delay(3000);
          clearData();
          lcd.clear();
          recharge = 1;
        }
        else if (card == "E3 06 19 D3")
        {
          num2 = Data;
          card2Balance = num2.toInt() + card2Balance;
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("Your current");
          lcd.setCursor(0, 1);
          lcd.print("balance: ");
          lcd.setCursor(9, 1);
          lcd.print (card2Balance);
          lcd.print(" Tk");
          delay(3000);
          clearData();
          lcd.clear();
          recharge = 1;
        }
      }
      else
      {
        Data[data_count] = Key;
        lcd.setCursor(data_count, 1);
        lcd.print(Data[data_count]);
        data_count++;
      }
    }
  }
}

void successfullyPaid()
{
  digitalWrite(buzzerPin, HIGH);
  delay(200);
  digitalWrite(buzzerPin, LOW);
  delay(100);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("  Successfully");
  lcd.setCursor(0, 1);
  lcd.print(" paid your bill");
  delay(1500);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Your Remaining");
  lcd.setCursor(0, 1);
  lcd.print("balance: ");
}

void failToPay()
{
  digitalWrite(buzzerPin, HIGH);
  delay(200);
  digitalWrite(buzzerPin, LOW);
  delay(100);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("  Your balance");
  lcd.setCursor(0, 1);
  lcd.print(" is insufficent");
  delay(1500);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Your Remaining");
  lcd.setCursor(0, 1);
  lcd.print("balance: ");
}