#include <WiFi.h>
#include <PubSubClient.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>

#define WIFI_SSID "YOUR_WIFI_SSID"
#define WIFI_PASSWORD "YOUR_WIFI_PASSWORD"
#define MQTT_BROKER "YOUR_MQTT_BROKER_IP"
#define MQTT_PORT 1883
#define MQTT_CLIENT_ID "YOUR_CLIENT_ID"
#define MQTT_TOPIC "temperature"

#define RELAY_PIN 2
#define LED_PIN 13

#define TEMPERATURE_THRESHOLD_HIGH 28
#define TEMPERATURE_THRESHOLD_LOW 26

WiFiClient espClient;
PubSubClient client(espClient);

Adafruit_BME280 bme;

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

  WiFi.begin(WIFI_SSID, WIFI_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 reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect(MQTT_CLIENT_ID)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);

  if (!bme.begin()) {
    Serial.println("Could not find a valid BME280 sensor, check wiring!");
    while (1);
  }

  setup_wifi();
  client.setServer(MQTT_BROKER, MQTT_PORT);
}

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

  float temperature = bme.readTemperature();

  Serial.print("Temperature: ");
  Serial.println(temperature);

  client.publish(MQTT_TOPIC, String(temperature).c_str());

  if (temperature >= TEMPERATURE_THRESHOLD_HIGH) {
    digitalWrite(RELAY_PIN, HIGH);
    digitalWrite(LED_PIN, HIGH);
  } else if (temperature <= TEMPERATURE_THRESHOLD_LOW) {
    digitalWrite(RELAY_PIN, LOW);
    digitalWrite(LED_PIN, LOW);
  }

  delay(1000);
}