#include <WiFi.h>
#include <HTTPClient.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_MAX30100.h>
#include <TinyGPS++.h>

const char* ssid = "your_network_name";
const char* password = "your_network_password";
const char* serverAddress = "http://your_server_ip_or_domain/rest_api.php";

// Sensor setup
Adafruit_MAX30100 max30100;
TinyGPSPlus gps;
HardwareSerial gpsSerial(1);

void setup() {
  Serial.begin(115200);
  gpsSerial.begin(9600, SERIAL_8N1, 16, 17); // TX, RX pins
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  if (!max30100.begin()) {
    Serial.println("MAX30100 not found");
    while (1);
  }
  max30100.setMode(MAX30100_MODE_SPO2_HR);
}

void loop() {
  // Read GPS data
  while (gpsSerial.available() > 0) {
    gps.encode(gpsSerial.read());
  }

  if (gps.location.isUpdated()) {
    float latitude = gps.location.lat();
    float longitude = gps.location.lng();

    // Read heart rate and SpO2
    uint16_t irValue, redValue;
    max30100.update();
    irValue = max30100.getIR();
    redValue = max30100.getRed();

    // Dummy calculation for demonstration purposes
    float heartRate = (irValue % 100); // Replace with actual heart rate calculation
    float oxygenLevel = (redValue % 100); // Replace with actual SpO2 calculation

    // Create JSON data
    String jsonData = "{\"heartRate\":";
    jsonData += heartRate;
    jsonData += ", \"oxygenLevel\":";
    jsonData += oxygenLevel;
    jsonData += ", \"latitude\":";
    jsonData += latitude;
    jsonData += ", \"longitude\":";
    jsonData += longitude;
    jsonData += "}";

    // Send data to server
    if (WiFi.status() == WL_CONNECTED) {
      HTTPClient http;
      http.begin(serverAddress);
      http.addHeader("Content-Type", "application/json");
      int httpResponseCode = http.POST(jsonData);
      if (httpResponseCode > 0) {
        String response = http.getString();
        Serial.println(httpResponseCode);
        Serial.println(response);
      } else {
        Serial.println("Error sending POST request");
      }
      http.end();
    }
  }
  delay(5000);
}