#include <WiFi.h>
#include "PubSubClient.h"
#include "DHTesp.h"
#include <ArduinoJson.h>

const int DHT_PIN = 23;  // Pin for DHT11/DHT22
const int LED_PIN = 34;
const int analogInputPin = A0;  // Define analog input pin for light sensor
int lightValue;  // Variable to store light sensor reading

DHTesp dhtSensor;

const char* MQTTServer = "broker.hivemq.com";
const char* MQTT_Topic = "21004250_dht";  // Common topic
const char* MQTT_LED_Topic = "21004250_led";  // Topic for LED control
const char* MQTT_ID = "684e5dd4-bece-45e9-9ba0-1c03d7ba8f06";
int Port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);

void WIFIConnect() {
  Serial.println("Connecting to SSID: Wokwi-GUEST");
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("WiFi connected");
  Serial.print(", IP address: ");
  Serial.println(WiFi.localIP());
}

void MQTT_Reconnect() {
  while (!client.connected()) {
    if (client.connect(MQTT_ID)) {
      Serial.println("MQTT connected");
      client.subscribe(MQTT_Topic);
      client.subscribe(MQTT_LED_Topic);  // Subscribe to the LED topic
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);
  String stMessage;
  for (int i = 0; i < length; i++) {
    stMessage += (char)message[i];
  }
  Serial.println(stMessage);

  // if (String(topic) == MQTT_LED_Topic) {
  if (stMessage == "ON") {
    digitalWrite(LED_PIN, HIGH);
  } else if (stMessage == "OFF") {
    digitalWrite(LED_PIN, LOW);
  }
  // }
}

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

  WIFIConnect();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);
  
  pinMode(LED_PIN, OUTPUT);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
}

void loop() {
  TempAndHumidity data = dhtSensor.getTempAndHumidity();
  
  // Read light sensor value
  lightValue = analogRead(analogInputPin);

  // Create JSON object
  StaticJsonDocument<200> jsonDoc;
  jsonDoc["temperature"] = data.temperature;
  jsonDoc["humidity"] = data.humidity;
  jsonDoc["light"] = lightValue;

  // Convert JSON object to string
  char jsonStr[200];
  serializeJson(jsonDoc, jsonStr);

  // Publish JSON string to MQTT broker
  client.loop();
  if (!client.connected()) {
    MQTT_Reconnect();
  }
  client.publish(MQTT_Topic, jsonStr);
  
  delay(2000);
}