#include <WiFi.h>
#include <HTTPClient.h>
#include <DHT.h>
#include <LiquidCrystal_I2C.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 = "GW22386EECHTI1S8";  // Ganti dengan API key Thingspeak Anda
const int MyChannelNumber = 2518105;

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

// Daftar pasien
Patient patients[] = {
  {"AB12CD", "John Doe"},
  {"EF34GH", "Jane Smith"},
  {"IJ56KL", "Michael Johnson"},
  {"MN78OP", "Emily Brown"},
  {"QR90ST", "David Wilson"},
  {"UV12WX", "Sarah Taylor"}
};

int numPatients = 6;

void setup() {
  Serial.begin(115200);
  lcd.begin(20, 4);  // Inisialisasi LCD 20x4
  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.print("WiFi Connected");
  lcd.setCursor(0, 1);
  lcd.print("IP Address:");
  lcd.setCursor(0, 1);
  lcd.print(WiFi.localIP());

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

void loop() {
  lcd.setCursor(0, 1);
  lcd.print("Tap ID card");

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

  String input = Serial.readStringUntil('\n');
  input.trim(); // Menghapus karakter spasi di awal dan akhir string

  lcd.clear();
  lcd.setCursor(6, 1);
  lcd.print("ID Card: ");
  lcd.print(input);

  // Kirim data ke Thingspeak dan kontrol LED dan buzzer
  if (sendToThingspeak(input)) {
    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(6, 1);
    lcd.print("Status: Valid");
  } else {
    digitalWrite(RED_LED_PIN, HIGH);
    digitalWrite(GREEN_LED_PIN, LOW);
    noTone(BUZZER_PIN);
    Serial.println("Invalid");
    lcd.setCursor(6, 1);
    lcd.print("Status: Invalid");
  }

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

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; // Mengembalikan true jika pengiriman berhasil
      } else {
        Serial.println("Failed to connect to Thingspeak");
        return false; // Mengembalikan false jika pengiriman gagal
      }
    }
  }
  Serial.println("Invalid card ID");
  return false; // Mengembalikan false jika ID kartu tidak valid
}