#include <WiFi.h>
#include "PubSubClient.h"
#include <ESP32Servo.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.emqx.io";
int port = 1883;
String stMac;
char mac[50];
char clientId[50];



WiFiClient espClient;
PubSubClient client(espClient);
Servo servo;
Servo servo2;
Servo servo3;
int pos = 0;

const int ledPin = 2;
const int servoPin = 13;
const int servoPin2 = 12;
const int servoPin3 = 14;
#define ECHO_PIN 27
#define TRIG_PIN 26

void setup() {
  Serial.begin(115200);
  randomSeed(analogRead(0));
  servo.attach(servoPin, 500, 2400);
  servo2.attach(servoPin2, 500, 2400);
  servo3.attach(servoPin3, 500, 2400);
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  wifiConnect();

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  Serial.println(WiFi.macAddress());
  stMac = WiFi.macAddress();
  stMac.replace(":", "_");
  Serial.println(stMac);
  
  client.setServer(mqttServer, port);
  client.setCallback(callback);
  pinMode(ledPin, OUTPUT);
  servo.write(0);
  servo2.write(0);
  servo3.write(0);
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}
void wifiConnect() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
}

void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    long r = random(1000);
    sprintf(clientId, "clientId-%ld", r);
    if (client.connect(clientId)) {
      Serial.print(clientId);
      Serial.println(" connected");
      client.subscribe("IKAN");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.print(topic);
  Serial.print(". Message: ");
  String stMessage;
  
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }
  Serial.println();
  
  if (String(topic) == "IKAN") {
    Serial.print("Changing output to ");
    if(stMessage == "makan"){
      Serial.println("on");
      digitalWrite(ledPin, HIGH);
      for (pos = 0; pos <= 45; pos += 1) {
      servo.write(pos);
      delay(100);
      }
      for (pos = 45; pos >= 0; pos -= 1) {
      servo.write(pos);
      delay(15);
      }
    }
    else if(stMessage == "makan2"){
      Serial.println("on2");
      digitalWrite(ledPin, HIGH);
      for (pos = 0; pos <= 45; pos += 1) {
      servo2.write(pos);
      delay(100);
      }
      for (pos = 45; pos >= 0; pos -= 1) {
      servo2.write(pos);
      delay(15);
      }
    }
    else if(stMessage == "makan3"){
      Serial.println("on3");
      digitalWrite(ledPin, HIGH);
      for (pos = 0; pos <= 45; pos += 1) {
      servo3.write(pos);
      delay(100);
      }
      for (pos = 45; pos >= 0; pos -= 1) {
      servo3.write(pos);
      delay(15);
      }
    }
    else if(stMessage == "off"){
      Serial.println("off");
      digitalWrite(ledPin, LOW);

    }
  }
}

void loop() {
  delay(10);
  if (!client.connected()) {
    mqttReconnect();
  }
  client.loop();

  float distance = readDistanceCM();
  bool isNearby = distance == 20.98;
  if (isNearby){
    client.publish("IKAN", " Pakan Ikan tinggal 50% "); 
  } 
  Serial.print("jarak: ");
  Serial.println(readDistanceCM());

  delay(100);
}