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

const char* ssid = "Wokwi-GUEST";    // Nama jaringan Wi-Fi
const char* password = "";           // Kata sandi jaringan Wi-Fi (kosong jika tidak ada kata sandi)
const char* serverName = "https://proyek-yusman.com/insert_data_jarak.php?jarak=";

// Pin LED
const int ledMerah = 21;
const int ledKuning = 22;
const int ledHijau = 23;

// Pin sensor ultrasonik
const int trigPin = 12;
const int echoPin = 13;

float duration_us, distance_cm;

void setup() {
  // Mulai komunikasi serial
  Serial.begin(115200);
  
  // Menghubungkan ke jaringan Wi-Fi
  WiFi.begin(ssid, password);
  Serial.println("Connecting to WiFi...");

  // Tunggu sampai terhubung
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  // Print alamat IP setelah terhubung
  Serial.println("");
  Serial.println("Connected to WiFi!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

  // Inisialisasi pin LED
  pinMode(ledMerah, OUTPUT);
  pinMode(ledKuning, OUTPUT);
  pinMode(ledHijau, OUTPUT);

  // Inisialisasi pin sensor ultrasonik
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  // Bagian sensor ultrasonik
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration_us = pulseIn(echoPin, HIGH);
  distance_cm = 0.017 * duration_us;

  // Print jarak ke Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance_cm);
  Serial.println(" cm");

  // Kontrol LED berdasarkan jarak
  if (distance_cm >= 300) {
    // Jarak lebih dari 300 cm
    digitalWrite(ledHijau, HIGH);
    digitalWrite(ledKuning, LOW);
    digitalWrite(ledMerah, LOW);
  } else if (distance_cm >= 100 && distance_cm < 300) {
    // Jarak antara 100 cm dan 299 cm
    digitalWrite(ledHijau, LOW);
    digitalWrite(ledKuning, HIGH);
    digitalWrite(ledMerah, LOW);
  } else if (distance_cm < 100) {
    // Jarak kurang dari 100 cm
    digitalWrite(ledHijau, LOW);
    digitalWrite(ledKuning, LOW);
    digitalWrite(ledMerah, HIGH);
  } else {
    // Kesalahan pembacaan sensor
    Serial.println("Error reading sensor");
  }

  // Kirim data jarak ke server
  if(WiFi.status()== WL_CONNECTED){
    HTTPClient http;

    String serverPath = serverName + String(distance_cm);
    
    http.begin(serverPath.c_str());

    int httpResponseCode = http.GET();
    
    if (httpResponseCode > 0) { 
      String payload = http.getString();
      Serial.println("Data sent to server:");
      Serial.println(payload);  // Mencetak respons dari server
    }
    else {
      Serial.print("Error on sending GET Request: ");
      Serial.println(httpResponseCode);
    }

    // Tutup koneksi
    http.end();
  }
  else {
    Serial.println("WiFi Disconnected");
  }

  // Tunggu sebentar sebelum pembacaan berikutnya
  delay(500);
}