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

// Wi-Fi credentials for Wokwi
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// MQTT broker
const char* mqtt_server = "broker.hivemq.com";
const int mqtt_port = 1883;

// DHT22 settings
#define DHTPIN 15
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// LDR analog output connected to GPIO36 (VP)
#define LDRPIN 36

// LED pins
#define RED_LED_PIN 22
#define GREEN_LED_PIN 23

// Light threshold to control LEDs
#define LIGHT_THRESHOLD 2000

WiFiClient espClient;
PubSubClient client(espClient);

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

void reconnect() {
  while (!client.connected()) {
    if (client.connect("WokwiESP32Client")) {
      client.publish("esp32/status", "Connected to broker.hivemq.com");
    } else {
      delay(5000);
    }
  }
}

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

  // MQTT setup
  client.setServer(mqtt_server, mqtt_port);

  // Initialize LEDs
  pinMode(RED_LED_PIN, OUTPUT);
  pinMode(GREEN_LED_PIN, OUTPUT);
}

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

  // Read sensors
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  int light = analogRead(LDRPIN);

  // Publish data
 client.publish("abdussalam/temperature", String(temperature).c_str());
client.publish("abdussalam/humidity", String(humidity).c_str());
client.publish("abdussalam/light", String(light).c_str());

  // LED control logic
  if (light < LIGHT_THRESHOLD) {
    digitalWrite(RED_LED_PIN, HIGH);
    digitalWrite(GREEN_LED_PIN, LOW);
  } else {
    digitalWrite(RED_LED_PIN, LOW);
    digitalWrite(GREEN_LED_PIN, HIGH);
  }

  // Serial debug
  Serial.print("Temp: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.print(" %, Light: ");
  Serial.println(light);

  delay(3000);
}