#include <WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
#include "DHT.h"

// --- WiFi & Cloud Credentials ---
#define WLAN_SSID       "Wokwi-GUEST" // Standard for Wokwi
#define WLAN_PASS       ""            // No password for Wokwi-GUEST
#define AIO_SERVER      "io.adafruit.com"
#define AIO_SERVERPORT  1883
#define AIO_USERNAME    "thirjesi_keerthi_sree" // Found on Adafruit IO
#define AIO_KEY         "aio_vXRa69oUoXiimE7K3V8mmJAalvMn"  // Found under Yellow Key icon

// --- Pin Definitions ---
#define DHTPIN 15
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
#define GAS_PIN 34

// --- MQTT Setup ---
WiFiClient client;
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
Adafruit_MQTT_Publish temp_feed = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/temperature");
Adafruit_MQTT_Publish hum_feed = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/humidity");
Adafruit_MQTT_Publish gas_feed = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/gas_level");

void setup() {
  Serial.begin(115200);
  dht.begin();
  
  // Connect to Virtual WiFi
  Serial.print("Connecting to WiFi");
  WiFi.begin(WLAN_SSID, WLAN_PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" Connected!");
}

void loop() {
  MQTT_connect();

  // Read Virtual Sensors
  float t = dht.readTemperature()*10;
  float h = dht.readHumidity();
  int rawGas = analogRead(GAS_PIN);
  
  // Map 0-4095 ESP32 reading to a 0-1000 scale for your dashboard
  int gasValue = map(rawGas, 0, 4095, 0, 1000);

  // Publish to Adafruit IO
  Serial.print("Sending Data... ");
  if (! temp_feed.publish(t)) Serial.print("Temp Failed. ");
  if (! hum_feed.publish(h)) Serial.print("Hum Failed. ");
  if (! gas_feed.publish((uint32_t)gasValue)) Serial.print("Gas Failed. ");
  
  Serial.println("Success!");
  
  delay(10000); // Wait 10 seconds (don't spam the free cloud!)
}

void MQTT_connect() {
  int8_t ret;
  if (mqtt.connected()) return;
  Serial.print("Connecting to MQTT... ");
  while ((ret = mqtt.connect()) != 0) {
    Serial.println(mqtt.connectErrorString(ret));
    mqtt.disconnect();
    delay(5000);
  }
  Serial.println("MQTT Connected!");
}