#include <WiFi.h>
#include <HTTPClient.h>
#include <DHT.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* api_key = "IMTUT5U03E23RA03";

#define DHTPIN 14      
#define DHTTYPE DHT22
#define BUZZER 2
#define LED_RED 4
#define HEART_SENSOR 34

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();
  pinMode(BUZZER, OUTPUT);
  pinMode(LED_RED, OUTPUT);

  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConnected!");
}

void loop() {
  int bpm = map(analogRead(HEART_SENSOR), 0, 4095, 40, 160); 
  float temp = dht.readTemperature();

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

  Serial.printf("BPM: %d | Temp: %.2fC\n", bpm, temp);

  if(bpm > 100 || bpm < 50 || temp > 38.0) {
    digitalWrite(BUZZER, HIGH); 
    digitalWrite(LED_RED, HIGH);
    Serial.println("!!! ALERT: PATIENT IN DANGER !!!");
  } else {
    digitalWrite(BUZZER, LOW);
    digitalWrite(LED_RED, LOW);
  }

  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    http.begin("https://api.favoriot.com/v1/streams");
    
    http.addHeader("Content-Type", "application/json");
    http.addHeader("apikey", api_token);

    String jsonPayload = "{";
    jsonPayload += "\"device_developer_id\":\"" + String(device_developer_id) + "\",";
    jsonPayload += "\"data\":{";
    jsonPayload += "\"bpm\":\"" + String(bpm) + "\",";
    jsonPayload += "\"temperature\":\"" + String(temp) + "\"";
    jsonPayload += "}}";

    int httpResponseCode = http.POST(jsonPayload);
    
    if (httpResponseCode > 0) {
      Serial.print("Favoriot Response: ");
      Serial.println(httpResponseCode);
    } else {
      Serial.print("Error sending POST: ");
      Serial.println(httpResponseCode);
    }
    http.end();
  }

  delay(5000);
}