#include <RTClib.h>
#include <WiFi.h>
#include <ThingSpeak.h>
#include <LiquidCrystal_I2C.h>
#include <Wire.h>

#define led_hijau 18
#define led_merah 19
#define BUZZER_PIN 2

const char* ssid = "Wokwi-GUEST";
const char* pass = "";
const int myChannelNumber = 2518832;
const char* myWriteApiKey = "BX91UFZBK77J3P9G";
const char* myReadApiKey = "UQRJIH0AJ511TOHY";
const char* server = "api.thingspeak.com";

WiFiClient client;
RTC_DS1307 rtc;
LiquidCrystal_I2C lcd(0x27, 20, 4);

const int VALID_CARD_COUNT = 6;
const int INVALID_CARD_COUNT = 4;
const int CARD_LENGTH = 12;

struct Card {
  char number[CARD_LENGTH + 1];
  char name[20];
  int thingspeak_field; //
};

Card valid_cards[VALID_CARD_COUNT] = {
  {"E280689401A9", "Farhan", 1},
  {"E2000019060C", "Putra", 2},
  {"G46RD9V40F3A", "Ario", 3},
  {"B71001B76894", "Zalfa", 4},
  {"1C81159073FD", "Nafis", 5},
  {"B710D0186022", "Zoro", 6}
};

Card invalid_cards[INVALID_CARD_COUNT] = {
  {"3FD659840001", "Invalid Card "},
  {"8115907B710E", "Invalid Card "},
  {"66D9V45E6E77", "Invalid Card "},
  {"E291450A556D", "Invalid Card "}
};

bool isValidCard(const char* cardNumber) {
  for (int i = 0; i < VALID_CARD_COUNT; ++i) {
    if (strcmp(valid_cards[i].number, cardNumber) == 0) {
      return true;
    }
  }
  return false;
}

void setup() {
  Serial.begin(9600);
  rtc.begin();
  lcd.init();
  lcd.backlight();
  pinMode(led_hijau, OUTPUT);
  pinMode(led_merah, OUTPUT);
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
  ThingSpeak.begin(client);

  lcd.setCursor(0, 0);
  lcd.print("Connecting");
  for (int i = 10; i < 14; i++) {
    lcd.setCursor(i, 0);
    lcd.print(".");
    delay(1000);
  }
  lcd.clear();
}

void loop() {
 lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Tap RFID Card");
  lcd.setCursor(0, 1);
  lcd.print("Nama:");
  lcd.setCursor(0, 2);
  lcd.print("Tanggal:");
  lcd.setCursor(0, 3);
  lcd.print("Jam:");

  while (!Serial.available()) {
    delay(100);
  }

  char cardNumber[CARD_LENGTH + 1];
  Serial.readBytesUntil('\n', cardNumber, CARD_LENGTH + 1);
  cardNumber[CARD_LENGTH] = '\0';

  lcd.clear();

  if (strlen(cardNumber) == CARD_LENGTH) {
    for (int i = 0; i < VALID_CARD_COUNT; ++i) {
      if (strcmp(valid_cards[i].number, cardNumber) == 0) {
        digitalWrite(led_hijau, HIGH);
        tone(BUZZER_PIN, 1000);
        delay(2000);
        noTone(BUZZER_PIN);

        rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
        DateTime now = rtc.now();
        
        ThingSpeak.writeField(myChannelNumber, valid_cards[i].thingspeak_field, now.hour(), myWriteApiKey);

        lcd.setCursor(4, 0);
        lcd.print("Selamat datang");       
        lcd.setCursor(0, 1);
        lcd.print("Nama: ");
        lcd.print(valid_cards[i].name);
        lcd.setCursor(0, 2);
        lcd.print("Tanggal: ");
        lcd.print(now.timestamp(DateTime::TIMESTAMP_DATE));

        lcd.setCursor(0, 3);
        lcd.print("Jam: ");
        lcd.print(now.timestamp(DateTime::TIMESTAMP_TIME));
        delay(15000);
        digitalWrite(led_hijau,LOW);

        return;
      }
    }

    for (int i = 0; i < INVALID_CARD_COUNT; ++i) {
      if (strcmp(invalid_cards[i].number, cardNumber) == 0) {
        lcd.setCursor(4, 0);
        lcd.print("Data Invalid");
        
        digitalWrite(led_merah, HIGH);
        tone(BUZZER_PIN, 500);
        delay(3000);
        digitalWrite(led_merah, LOW);
        noTone(BUZZER_PIN);
        return;
      }
    }
    lcd.print("Kartu Tidak Dikenali");
  } else {
    lcd.print("Format Salah");
    delay(7000);
  }
}