#include <WiFi.h>
#include <HTTPClient.h>
#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#include <WiFiUdp.h>
#include "time.h"

#define DHTPIN 4           // Pin data sensor DHT22 terhubung ke pin 4
#define DHTTYPE DHT22      // Tipe sensor DHT (DHT22)
#define BUZZER_PIN 19      // Pin untuk Buzzer
#define GREEN_LED_PIN 18   // Pin untuk LED Hijau
#define RED_LED_PIN 17     // Pin untuk LED Merah

DHT dht(DHTPIN, DHTTYPE);  // Inisialisasi sensor DHT22
LiquidCrystal_I2C lcd(0x27, 20, 4);  // Alamat I2C LCD 20x4 (0x27)

const char *ssid = "Wokwi-GUEST";  // Ganti dengan SSID WiFi Anda
const char *password = "";  // Ganti dengan password WiFi Anda

const char *host = "api.thingspeak.com";  // Host Thingspeak
const char *apiKey = "YourAPIKey";  // Ganti dengan API key Thingspeak Anda

// Struktur untuk menyimpan ID kartu dan nama pasien
struct Patient {
  String cardID;
  String name;
};

// Daftar pasien
Patient patients[] = {
  {"E280689401A9", "fahmi"},
  {"E2000019060C", "Rifat"},
  {"G46RD9V40F3A", "Angga"},
  {"B71001B76894", "Bilal"},
  {"1C81159073FD", "Zulia"},
  {"B710D0186022", "Razaq"}
};

int numPatients = 6;

WiFiUDP ntpUDP;
const long utcOffsetInSeconds = 3600 * 7;  // Offset zona waktu Anda dalam detik

void setup() {
  Serial.begin(115200);
  lcd.init();       // Inisialisasi LCD
  lcd.backlight();  // Nyalakan backlight LCD
  dht.begin();      // Inisialisasi sensor DHT22

  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(GREEN_LED_PIN, OUTPUT);
  pinMode(RED_LED_PIN, OUTPUT);

  WiFi.begin(ssid, password);  // Mulai koneksi WiFi

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi..");
  }
  Serial.println("Connected to WiFi");

  lcd.setCursor(0, 1);
  lcd.print("IP Address:");
  lcd.setCursor(0, 2);
  lcd.print(WiFi.localIP());

  configTime(utcOffsetInSeconds, 0, "pool.ntp.org", "time.nist.gov");
  while (!time(nullptr)) {
    Serial.print(".");
    delay(1000);
  }
  Serial.println("\nTime synchronized");

  delay(2000);
  lcd.clear();
}

void loop() {
  lcd.setCursor(0, 0);
  lcd.print("Tap ID card");

  Serial.println("Masukkan No ID:");
  while (Serial.available() == 0) {
    delay(100);
  }

  String input = Serial.readStringUntil('\n');
  input.trim();

  float temperature = dht.readTemperature();

  String name = "";
  bool isValid = false;
  for (int i = 0; i < numPatients; i++) {
    if (input == patients[i].cardID) {
      name = patients[i].name;
      isValid = true;
      break;
    }
  }

  // lcd.clear();
  // lcd.setCursor(0, 0);
  // lcd.print("ID: " + input);
  // lcd.setCursor(0, 1);
  // lcd.print("Suhu: ");
  // lcd.print(temperature);
  // lcd.print(" C");

  if (isValid) {
    digitalWrite(GREEN_LED_PIN, HIGH);
    digitalWrite(RED_LED_PIN, LOW);
    tone(BUZZER_PIN, 1000, 1000);
    delay(2000);
    noTone(BUZZER_PIN);
    Serial.println("Valid");
    lcd.setCursor(0, 2);
    lcd.print("Nama: " + name);
    lcd.setCursor(0, 3);
    lcd.print("Waktu: " + getTimeStamp());
    sendToThingspeak(input);
  } else {
    digitalWrite(RED_LED_PIN, HIGH);
    digitalWrite(GREEN_LED_PIN, LOW);
    noTone(BUZZER_PIN);
    Serial.println("Invalid");
    lcd.setCursor(0, 2);
    lcd.print("Status: Invalid");
  }

  delay(2000);
  lcd.clear();
}

String getTimeStamp() {
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    Serial.println("Failed to obtain time");
    return "No Time";
  }
  char buffer[20];
  strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", &timeinfo);
  return String(buffer);
}

bool sendToThingspeak(String data) {
  for (int i = 0; i < numPatients; i++) {
    if (data == patients[i].cardID) {
      WiFiClient client;
      if (client.connect(host, 80)) {
        String url = "/update";
        String postData = "api_key=" + String(apiKey) + "&field1=" + patients[i].name;

        client.println("POST " + url + " HTTP/1.1");
        client.println("Host: " + String(host));
        client.println("Connection: close");
        client.println("Content-Type: application/x-www-form-urlencoded");
        client.print("Content-Length: ");
        client.println(postData.length());
        client.println();
        client.print(postData);

        Serial.println("Sending data to Thingspeak...");

        while (client.connected()) {
          if (client.available()) {
            String line = client.readStringUntil('\r');
            Serial.println(line);
          }
        }

        client.stop();
        Serial.println("Data sent successfully");

        return true; // Return true if the submission was successful
      } else {
        Serial.println("Failed to connect to Thingspeak");
        return false; // Return false if the connection failed
      }
    }
  }
  Serial.println("Invalid card ID");
  return false; // Return false if the card ID is not valid
}