#include <WiFi.h>
#include <PubSubClient.h>
#include <NewPing.h>

// Konfigurasi Wi-Fi
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Konfigurasi MQTT
const char* mqtt_server = "broker.hivemq.com";
WiFiClient espClient;
PubSubClient client(espClient);

// Konfigurasi sensor ultrasonic
#define TRIG_PIN 5
#define ECHO_PIN 18
#define MAX_DISTANCE 400 // dalam cm
NewPing sonar(TRIG_PIN, ECHO_PIN, MAX_DISTANCE);

// Konfigurasi LED dan buzzer
#define LED_GREEN 12 // LED hijau (air kosong)
#define LED_YELLOW 14 // LED kuning (air pertengahan)
#define LED_RED 27 // LED merah (air penuh)
#define BUZZER_PIN 26 // Buzzer

unsigned long lastMsg = 0;

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

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

  Serial.println();
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);

    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      client.publish("/waterLevel/status", "ESP32 Connected");
      client.subscribe("/waterLevel/control");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);

  // Konfigurasi pin LED dan buzzer
  pinMode(LED_GREEN, OUTPUT);
  pinMode(LED_YELLOW, OUTPUT);
  pinMode(LED_RED, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  // Matikan semua LED dan buzzer saat startup
  digitalWrite(LED_GREEN, LOW);
  digitalWrite(LED_YELLOW, LOW);
  digitalWrite(LED_RED, LOW);
  digitalWrite(BUZZER_PIN, LOW);
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  unsigned long now = millis();
  if (now - lastMsg > 2000) {
    lastMsg = now;

    // Baca jarak dari sensor ultrasonic
    float distance = sonar.ping_cm();

    // Validasi hasil pengukuran
    if (distance == 0) {
      distance = MAX_DISTANCE; // Asumsikan jarak maksimal jika tidak terdeteksi
    }

    // Logika indikator LED dan buzzer
    if (distance >= 200) {
      // Air kosong
      digitalWrite(LED_GREEN, HIGH);
      digitalWrite(LED_YELLOW, LOW);
      digitalWrite(LED_RED, LOW);
      digitalWrite(BUZZER_PIN, LOW);
    } else if (distance > 2 && distance < 200) {
      // Air pertengahan (LED kuning selalu menyala)
      digitalWrite(LED_GREEN, LOW);
      digitalWrite(LED_YELLOW, HIGH);
      digitalWrite(LED_RED, LOW);
      digitalWrite(BUZZER_PIN, LOW);
    } else if (distance <= 2) {
      // Air penuh
      digitalWrite(LED_GREEN, LOW);
      digitalWrite(LED_YELLOW, LOW);
      digitalWrite(LED_RED, HIGH);
      digitalWrite(BUZZER_PIN, HIGH);
    }

    // Kirim data ke MQTT
    String distanceStr = String(distance, 2);
    client.publish("/waterLevel/distance", distanceStr.c_str());

    Serial.print("Distance: ");
    Serial.println(distanceStr + " cm");
  }
}