#include <SPI.h>
#include <MFRC522.h>
#include <Wire.h>
#include <RTClib.h>
#include <LiquidCrystal_I2C.h>

#define SS_PIN 10
#define RST_PIN 9
#define LED_YASHIL 2
#define LED_QIZIL 3

MFRC522 rfid(SS_PIN, RST_PIN);
RTC_DS1307 rtc;
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Tizimga kiritilgan xodim kartasi UID kodi
byte xodim_UID[] = {0x1A, 0x2B, 0x3C, 0x4D};
// Ish boshlanish vaqti: 09:00
const int ISH_SOATI = 9;
const int ISH_DAQIQASI = 0;

void setup() {
  Serial.begin(9600);
  SPI.begin();
  rfid.PCD_Init();
  lcd.init();
  lcd.backlight();
  rtc.begin();

  pinMode(LED_YASHIL, OUTPUT);
  pinMode(LED_QIZIL, OUTPUT);

  lcd.print("Tizim Tayyor...");
}

void loop() {
  if (!rfid.PICC_IsNewCardPresent() || !rfid.PICC_ReadCardSerial()) return;

  bool xodimTogri = true;
  for (byte i = 0; i < 4; i++) {
    if (rfid.uid.uidByte[i] != xodim_UID[i]) {
      xodimTogri = false;
      break;
    }
  }

  DateTime hozir = rtc.now();
  lcd.clear();

  if (xodimTogri) {
    lcd.setCursor(0, 0);
    lcd.print("Aliyev A.");

    // Kechikishni hisoblash algoritmi
    int joriyDaqiqaUtsin = (hozir.hour() * 60) + hozir.minute();
    int ishDaqiqaUtsin = (ISH_SOATI * 60) + ISH_DAQIQASI;

    lcd.setCursor(0, 1);
    if (joriyDaqiqaUtsin <= ishDaqiqaUtsin) {
      // Vaqtida kelgan holat
      lcd.print("Vaqtida keldi");
      digitalWrite(LED_YASHIL, HIGH);
      delay(1000);
      digitalWrite(LED_YASHIL, LOW);
      Serial.println("Xodim: Aliyev A. | Holati: Vaqtida keldi | Soat: " + String(hozir.hour()) + ":" + String(hozir.minute()));
    } else {
      // Kechikib kelgan holat
      int kechikish = joriyDaqiqaUtsin - ishDaqiqaUtsin;
      lcd.print("Kechikdi: " + String(kechikish) + " m");
      digitalWrite(LED_QIZIL, HIGH);
      delay(1000);
      digitalWrite(LED_QIZIL, LOW);
      Serial.println("Xodim: Aliyev A. | Holati: KECHIKDI (" + String(kechikish) + " daqiqa) | Soat: " + String(hozir.hour()) + ":" + String(hozir.minute()));
    }
  } else {
    lcd.print("Noma'lum Karta!");
    digitalWrite(LED_QIZIL, HIGH);
    delay(500);
    digitalWrite(LED_QIZIL, LOW);
  }

  delay(2000);
  rfid.PICC_HaltA();
}