#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <HTTPClient.h>

const char* ssid = "Wokwi-GUEST"; // Nama WiFi
const char* password = ""; // Kata sandi WiFi
const char* serverName = "http://service.ngarduino.com/sendMessage";
const int sensorPin = 34; // Pin AO sensor photoresistor
const int threshold = 1500; // Threshold sensor
bool notificationSent = false; // Variabel untuk melacak apakah notifikasi sudah dikirim
const int relayPin1 = 16;   // Pin kontrol untuk relay 1
const int relayPin2 = 17;   // Pin kontrol untuk relay 2

LiquidCrystal_I2C lcd(0x27, 16, 2);  // Alamat I2C untuk LCD1602
unsigned long lastNotificationTime = 0; // Waktu terakhir notifikasi dikirim

void setup() {
  Serial.begin(115200);
  lcd.init();                      // Inisialisasi LCD
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Connecting WiFi..");

  WiFi.begin(ssid, password);
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("WiFi Connected");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Nilai Sensor:");
  pinMode(sensorPin, INPUT);
  pinMode(relayPin1, OUTPUT);
  pinMode(relayPin2, OUTPUT);
}

void loop() {
  int sensorValue = analogRead(sensorPin);
  lcd.setCursor(0, 1);
  lcd.print(sensorValue);

  if(sensorValue > threshold && !notificationSent) {
    sendWhatsAppNotification(sensorValue);
    notificationSent = true;
    lcd.setCursor(0, 1);
    lcd.print("pH Lagi drop ");
    lcd.print(sensorValue);
    digitalWrite(relayPin1, HIGH);  // Aktifkan relay 1
    digitalWrite(relayPin2, HIGH);  // Aktifkan relay 2
  }
  else if(sensorValue <= threshold) {
    notificationSent = false;
    lcd.setCursor(0, 1);
    lcd.print("               "); // Menghapus pesan notifikasi jika nilai sensor kembali di bawah threshold
    digitalWrite(relayPin1, LOW);   // Matikan relay 1
    digitalWrite(relayPin2, LOW);   // Matikan relay 2
  }

  // Kirim notifikasi setiap 10 detik
  unsigned long currentTime = millis();
  if (currentTime - lastNotificationTime >= 10000) {
    sendSensorValueNotification(sensorValue);
    lastNotificationTime = currentTime;
  }

  delay(1000);
}

void sendWhatsAppNotification(int sensorValue) {
  if(WiFi.status()== WL_CONNECTED){
    HTTPClient http;
    http.begin(serverName);
    http.addHeader("Content-Type", "application/x-www-form-urlencoded");
    String key = "Y1h134EjC2l58Kh5NI94yzcpe9piilyV"; // Kunci Anda
    String message = "pH Lagi drop " + String(sensorValue); // Pesan untuk notifikasi WhatsApp
    String group = "5gSQ"; // Group WhatsApp
    String postData = "key=" + key + "&message=" + message + "&group=" + group; // Parameter POST
    int httpResponseCode = http.POST(postData);
    String payload = http.getString();
    Serial.println(payload);
    http.end();
  }
  else {
    Serial.println("WiFi Disconnected");
  }
}

void sendSensorValueNotification(int sensorValue) {
  if(WiFi.status()== WL_CONNECTED){
    HTTPClient http;
    http.begin(serverName);
    http.addHeader("Content-Type", "application/x-www-form-urlencoded");
    String key = "Y1h134EjC2l58Kh5NI94yzcpe9piilyV"; // Kunci Anda
    String message = "Nilai Sensor saat ini: " + String(sensorValue); // Pesan untuk notifikasi WhatsApp
    String group = "5gSQ"; // Group WhatsApp
    String postData = "key=" + key + "&message=" + message + "&group=" + group; // Parameter POST
    int httpResponseCode = http.POST(postData);
    String payload = http.getString();
    Serial.println(payload);
    http.end();
  }
  else {
    Serial.println("WiFi Disconnected");
  }
}