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

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* MQTT_username = NULL;
const char* MQTT_password = NULL;
const char* mqtt_server = "test.mosquitto.org";
#define FLAME_PIN 33       // Pin connected to IR Flame sensor
#define ALERT_PIN 27       // Pin connected to alert LED

WiFiClient espClient;
PubSubClient client(espClient);

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  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 setup() {
  Serial.begin(115200);
  
  pinMode(FLAME_PIN, INPUT);  // Set flame sensor pin as input
  pinMode(ALERT_PIN, OUTPUT); // Set alert LED pin as output
  
  setup_wifi();
  client.setServer(mqtt_server, 1883);
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESP32Client")) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  
  int flame_state = digitalRead(FLAME_PIN);
  Serial.print("%  |  Flame: ");
  Serial.println(flame_state);

  client.publish("flame_state", String(flame_state).c_str());

  if (flame_state == LOW) { // Change to LOW if the flame sensor is active low
    digitalWrite(ALERT_PIN, HIGH);
    client.publish("fire_alert", "Fire detected!");
  } else {
    digitalWrite(ALERT_PIN, LOW);
  }

  delay(2000);
}