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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "broker.emqx.io";  // Raspberry Pi IP address
const int mqtt_port = 1883;
const char* topic = "DOOR_TOPIC";
const char* id = "fsgfsrkl" + random(3000) + random(3000);

const int servoPin = 2;
Servo servo;

WiFiClient espClient;
PubSubClient client(espClient);

void setup_wifi() {
  delay(10);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi connected");
}

void callback(char* topic, byte* payload, unsigned int length) {
  String message;
  for (int i = 0; i < length; i++) {
    message += (char)payload[i];
  }
  if(message == "open") {
    int pos = 0;
    for (pos = 0; pos <= 180; pos += 1) {
      servo.write(pos);
      delay(15);
    }
    delay(5000);
    for (pos = 180; pos >= 0; pos -= 1) {
      servo.write(pos);
      delay(15);
    }
  }
}

void reconnect() {
  while (!client.connected()) {
    if (client.connect(id)) {
      client.subscribe(topic);
    } else {
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
  servo.attach(servoPin, 500, 2400);
  servo.write(0);
}

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