//Studant Tag   --->    29 EC 2A B9
//Dr Card #1    --->    22 AC 75 34
//Dr Card #2    --->    B6 BC 72 2B
//Dr Card #3    --->    C0 6B BB 32
//Dr Card #4    --->    C0 BD B6 32
/*
   RTC [8AM-->4PM DR only Allowed] ✔
   IR Sensor [Parking_1] ✔
   IR Sensor [Parking_2] ✔
   IR Sensor [Parking_3] ✔
   LED [Parking_1] ✔
   LED [Parking_2] ✔
   LED [Parking_3] ✔
   RFID Cards x5 [All Open] ✔
   Button [To Enter with No CARD] ✔
   LCD 20*4 [Show (IN#)+(OUT#)+(Current#)] ✔
   IR Sensor [Exit] ✔
   Servo_IN ✔
   Servo_OUT ✔
*/
#include <SPI.h>
#include <Wire.h>
#include <Servo.h>
#include "RTClib.h"
#include <MFRC522.h>
#include <LiquidCrystal_I2C.h>

#define SS_PIN            10
#define RST_PIN           9
#define button_PIN        8
#define exit_PIN          7
#define LED_parking_1     2
#define LED_parking_2     3
#define LED_parking_3     4
#define sensor_parking_1  A1
#define sensor_parking_2  A2
#define sensor_parking_3  A3


Servo servoIN;  //5
Servo servoOUT; //6


RTC_DS3231 rtc;
MFRC522 mfrc522(SS_PIN, RST_PIN);
LiquidCrystal_I2C lcd(0x27, 16, 2);

int emptySpaces = 3;
bool parking_1 = 0;
bool parking_2 = 0;
bool parking_3 = 0;
int CurrentCount = 0;
int exit_status = 0;
int button_status = 0;

char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

void setup() {
  Serial.begin(9600);
  pinMode(LED_parking_1, OUTPUT);
  pinMode(LED_parking_2, OUTPUT);
  pinMode(LED_parking_3, OUTPUT);
  pinMode(sensor_parking_1, INPUT);
  pinMode(sensor_parking_2, INPUT);
  pinMode(sensor_parking_3, INPUT);
  pinMode(button_PIN, INPUT);
  pinMode(exit_PIN, INPUT);
  digitalWrite(LED_parking_1, 0);// Green ON --- Parking 1
  digitalWrite(LED_parking_2, 0);// Green ON --- Parking 2
  digitalWrite(LED_parking_3, 0);// Green ON --- Parking 3
  SPI.begin();
  mfrc522.PCD_Init();
  servoIN.attach(5);
  servoOUT.attach(6);
  servoIN.write(0);
  servoOUT.write(0);
  lcd.init();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Starting...");
  delay(1000);
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }

  if (rtc.lostPower()) {
    Serial.println("RTC lost power, let's set the time!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}

void loop() {
  DateTime now = rtc.now();
  button_status = digitalRead(button_PIN);
  exit_status = digitalRead(exit_PIN);
  chkSensors();
  lcd.setCursor(0, 0);
  //        "****************"
  lcd.print("Parking Empty:");
  lcd.setCursor(0, 1);
  //        "****************"
  lcd.print(emptySpaces);
  lcd.print("          ");

  if ( button_status > 0 && emptySpaces > 0) {
    // Open IN Gate
    servoIN.write(90);
    delay(3000);
    servoIN.write(0);
  }
  if (exit_status == 0) {
    // Open OUT Gate
    servoOUT.write(90);
    delay(3000);
    servoOUT.write(0);
  }
  if ( ! mfrc522.PICC_IsNewCardPresent()) {
    return;
  }

  if ( ! mfrc522.PICC_ReadCardSerial() ) {
    return;
  }
  String content = "";
  byte letter;
  for (byte i = 0; i < mfrc522.uid.size; i++) {
    Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
    Serial.print(mfrc522.uid.uidByte[i], HEX);
    content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
    content.concat(String(mfrc522.uid.uidByte[i], HEX));
  }
  Serial.println();
  content.toUpperCase();




  //------------ Code
  // 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16
  if (now.hour() >= 8 && now.hour() <= 16) {
    // Allow Access RFID Scanner for Dr Only
    //Dr Card #1    --->    22 AC 75 34
    //Dr Card #2    --->    B6 BC 72 2B
    //Dr Card #3    --->    C0 6B BB 32
    //Dr Card #4    --->    C0 BD B6 32
    //                                1                                        2                                        3                                        4                                        5
    if (content.substring(1) == "22 AC 75 34" || content.substring(1) == "B6 BC 72 2B" || content.substring(1) == "C0 BD B6 32" || content.substring(1) == "C0 6B BB 32")
    {
      if (emptySpaces > 0) {
        // Open IN Gate
        servoIN.write(90);
        delay(3000);
        servoIN.write(0);
      }
    }
    else
    {
      // Don't Open IN Gate
      servoIN.write(0);
    }
  }
  // 17 - 18 - 19 - 20 - 21 - 22 - 23 - 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7
  else {
    // Allow Access RFID Scanner for All
    //Studant Tag   --->    29 EC 2A B9
    //Dr Card #1    --->    22 AC 75 34
    //Dr Card #2    --->    B6 BC 72 2B
    //Dr Card #3    --->    C0 6B BB 32
    //Dr Card #4    --->    C0 BD B6 32
    //                                1                                        2                                        3                                        4                                        5
    if (content.substring(1) == "29 EC 2A B9" || content.substring(1) == "22 AC 75 34" || content.substring(1) == "B6 BC 72 2B" || content.substring(1) == "C0 BD B6 32" || content.substring(1) == "C0 6B BB 32")
    {
      if (emptySpaces > 0) {
        // Open IN Gate
        servoIN.write(90);
        delay(3000);
        servoIN.write(0);
      }
    }
    else
    {
      // Don't Open IN Gate
      servoIN.write(0);
    }
  }

}//end of LOOP



void chkSensors() {

  parking_1 = digitalRead(sensor_parking_1);
  parking_2 = digitalRead(sensor_parking_2);
  parking_3 = digitalRead(sensor_parking_3);

  emptySpaces = parking_1 + parking_2 + parking_3;

  if (parking_1 == 0) {
    digitalWrite(LED_parking_1, 1);// Red   ON --- Parking 1
  }
  else if (parking_1 == 1) {
    digitalWrite(LED_parking_1, 0);// Green ON --- Parking 1
  }
  if (parking_2 == 0) {
    digitalWrite(LED_parking_2, 1);// Red   ON --- Parking 2
  }
  else if (parking_2 == 1) {
    digitalWrite(LED_parking_2, 0);// Green ON --- Parking 2
  }
  if (parking_3 == 0) {
    digitalWrite(LED_parking_3, 1);// Red   ON --- Parking 3
  }
  else if (parking_3 == 1) {
    digitalWrite(LED_parking_3, 0);// Green ON --- Parking 3
  }
}