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

#define DHTPIN 13
#define DHTTYPE DHT22

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "broker.hivemq.com";
const char* clientID = "clientId-carHXNUwjt";

const char* topic_temp = "sensor/temperature";
const char* topic_pulse = "sensor/pulserate";
const char* topic_oxygen = "sensor/oxygen";

WiFiClient espClient;
PubSubClient client(espClient);
DHT dht(DHTPIN, DHTTYPE);

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 callback(char* topic, byte* message, unsigned int length) {
  // Handle message received
}

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

void setup() {
  Serial.begin(115200);
  dht.begin();
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

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

  float temperature = dht.readTemperature();
  // Placeholder values for pulse rate and oxygen levels
  int pulseRate = analogRead(34); // Replace with actual sensor reading
  int oxygenLevel = analogRead(35); // Replace with actual sensor reading

  if (isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  char tempStr[8];
  char pulseStr[8];
  char oxygenStr[8];

  dtostrf(temperature, 1, 2, tempStr);
  itoa(pulseRate, pulseStr, 10);
  itoa(oxygenLevel, oxygenStr, 10);

  client.publish(topic_temp, tempStr);
  client.publish(topic_pulse, pulseStr);
  client.publish(topic_oxygen, oxygenStr);

  Serial.print("Temperature: ");
  Serial.println(tempStr);
  Serial.print("Pulse Rate: ");
  Serial.println(pulseStr);
  Serial.print("Oxygen Level: ");
  Serial.println(oxygenStr);

  delay(60000); // Wait for 60 seconds
}