#include <Arduino.h>

// ================= SENSOR DATA STRUCT =================
struct SensorData {
  float temperature;
  float humidity;
  int light;
};

// ================= GLOBAL SENSOR DATA =================
SensorData sensor;  // Single global struct to avoid dynamic allocation

// ================= SENSOR READING FUNCTION =================
void readSensors(SensorData &data) {
  data.temperature = random(200, 300) / 10.0; // 20.0°C to 30.0°C
  data.humidity = random(300, 600) / 10.0;    // 30% to 60%
  data.light = random(0, 1024);               // 0 to 1023
}

// ================= SETUP =================
void setup() {
  Serial.begin(115200);
  while (!Serial);
  Serial.println("Memory Leak Prevention Demo");
}

// ================= LOOP =================
void loop() {
  // Fill global struct with new sensor readings
  readSensors(sensor);

  // Print sensor data + free heap
  Serial.print("Free Heap: ");
  Serial.print(ESP.getFreeHeap());
  Serial.print(" | Temp: ");
  Serial.print(sensor.temperature);
  Serial.print("°C, Hum: ");
  Serial.print(sensor.humidity);
  Serial.print("%, Light: ");
  Serial.println(sensor.light);

  delay(1000); // simulate 1 second sampling
}