#include <WiFi.h>
#include <PubSubClient.h>
#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "broker.hivemq.com";

WiFiClient espClient;
PubSubClient client(espClient);
LiquidCrystal_I2C lcd(0x27, 16, 2);

Servo fanServo;
const int SERVO_PIN = 18;

void setup() {
  Serial.begin(115200);

  fanServo.attach(SERVO_PIN);

  lcd.init();
  lcd.backlight();
  lcd.print("ceiling fan ");

  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

void callback(char* topic, byte* payload, unsigned int length) {
  String message = "";
  for (int i = 0; i < length; i++) message += (char)payload[i];

  int speed = message.toInt();

  int angle = map(speed, 0, 3, 0, 180); // 0–3 → 0–180°

  fanServo.write(angle);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("MQTT Received");
  lcd.setCursor(0, 1);
  lcd.print("Speed: ");
  lcd.print(speed);
}

void setup_wifi() {
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) delay(500);
}

void reconnect() {
  while (!client.connected()) {
    if (client.connect("ESP32_Receiver")) {
      client.subscribe("home/fan/speed");
    } else {
      delay(2000);
    }
  }
}

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