#include <Wire.h> 
#include <WiFi.h>
#include <DHT.h>
#include <PubSubClient.h>
#include <Arduino.h>

#define DHT_PIN 12 
// Define PULSE_PIN
#define PULSE_PIN 35

#define MQTT_SERVER "broker.emqx.io"
#define MQTT_PORT 1883

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

#define MQTT_TOPIC_HR "/heartRate"
#define MQTT_TOPIC_TEMP "/tempValue"
#define MQTT_TOPIC_HUM "/humValue"

WiFiClient espClient;
PubSubClient client(espClient);

DHT dht(DHT_PIN, DHT22);

void setup() {
  Wire.begin(23, 22);
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  connectToWiFi();
  
  client.setServer(MQTT_SERVER, MQTT_PORT);

  dht.begin();
}

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

  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();  
  
  // Read pulseValue from PULSE_PIN 
  int16_t pulseValue = analogRead(PULSE_PIN);
  
  // Convert pulseValue to voltage
  float voltage = pulseValue * (5 / 4095.0);
  
  // calculate heartRate from volatge
  int heartRate = (voltage / 3.3) * 675;
  

  //  Print HeartRate
   Serial.print("Heart Rate");
   Serial.print(heartRate); 
   Serial.print(" Temp: ");
   Serial.print(temperature);
   Serial.print(" Humidity: ");
   Serial.println(humidity);

   delay(100);

   client.publish(MQTT_TOPIC_HR, String(heartRate).c_str());
   client.publish(MQTT_TOPIC_TEMP, String(temperature).c_str());
   client.publish(MQTT_TOPIC_HUM, String(humidity).c_str());

   Serial.print("Sent mtqq data");
   delay(10);
}

void connectToWiFi() {
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void reconnect() {
  while (!client.connected()) {
    if (client.connect("esp32_neopixel_controller")) {
      Serial.println("Connected to MQTT");
      // subscribeToCommands();
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" Retrying in 5 seconds...");
      delay(5000);
    }
  }
}