#define BLYNK_TEMPLATE_ID   "SILA_REPLACE_ID_ANDA"
#define BLYNK_TEMPLATE_NAME "SILA_REPLACE_NAME_ANDA"
#define BLYNK_AUTH_TOKEN    "SILA_REPLACE_TOKEN_ANDA"

#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <ESP32Servo.h>

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

Servo s1;
const int trigPin = 5;
const int echoPin = 18;
const int soilPin = 34; 

long duration;
int distanceCm;
int soilValue = 0;
bool isWet = false;
bool tongSudahBuka = false;

BlynkTimer timer;

// Fungsi pemasa: Menghantar data ke Blynk setiap 2 saat
void sendSensorData() {
  // 1. Hantar data jarak ke V2
  Blynk.virtualWrite(V2, distanceCm); 
  
  // 2. Hantar status semasa ke V1 secara real-time
  if (distanceCm < 20) {
    if (isWet) {
      Blynk.virtualWrite(V1, "SISA BASAH"); 
    } else {
      Blynk.virtualWrite(V1, "SISA KERING");
    }
  } else {
    Blynk.virtualWrite(V1, "Tong Ditutup (Sedia)");
  }
}

void setup() {
  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);

  s1.attach(19); 
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Set pemasa 2 saat
  timer.setInterval(2000L, sendSensorData);
  
  Serial.println("--- Sistem Smart Eco Bin IoT Bermula ---");
}

void loop() {
  Blynk.run();
  timer.run();

  // Baca Jarak (Ultrasonic)
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);
  distanceCm = duration * 0.034 / 2;

  // Baca Kelembapan (Potentiometer)
  soilValue = analogRead(soilPin); 
  if (soilValue > 2000) { 
    isWet = true;  
  } else {
    isWet = false; 
  }

  // Logik Kawalan Servo & Notifikasi Emel
  if (distanceCm < 20) { 
    if (tongSudahBuka == false) { 
      if (isWet == true) {
        Serial.println("Mesej: Ini sisa basah!"); 
        s1.write(100); 
        Blynk.logEvent("sampah_masuk", "Amaran: Sisa BASAH telah dimasukkan ke dalam tong!");
      } 
      else {
        Serial.println("Mesej: Ini sisa kering!"); 
        s1.write(0);   
        Blynk.logEvent("sampah_masuk", "Notifikasi: Sisa KERING telah dimasukkan ke dalam tong.");
      }
      tongSudahBuka = true; 
      delay(2000); 
    }
  } 
  else { 
    s1.write(50); 
    tongSudahBuka = false; 
  }

  delay(50); 
}