#include <Wire.h>

// Simulated temperature sensor pin
const int tempSensorPin = 34; // Analog pin for the simulated NTC thermistor

// Data logging
const int logInterval = 5000; // Log temperature every 5 seconds (in ms)
const int maxLogSize = 60;    // Maximum number of logged values (5 minutes of data)
float temperatureLog[maxLogSize];
int logIndex = 0;

// Constants for temperature simulation
const float maxTemp = 37.0;   // Maximum simulated body temperature
const float minTemp = 35.5;   // Minimum simulated body temperature
const int adcMaxValue = 4095; // Max ADC value for ESP32
const float refVoltage = 3.3; // Reference voltage for ESP32 ADC

unsigned long lastLogTime = 0;

void setup() {
  Serial.begin(115200);
  Serial.println("Sleep Stage Temperature Logging");
}

void loop() {
  // Simulate temperature reading
  int rawValue = analogRead(tempSensorPin);
  float currentTemp = map(rawValue, 0, adcMaxValue, minTemp * 100, maxTemp * 100) / 100.0;

  // Log the temperature at regular intervals
  if (millis() - lastLogTime >= logInterval) {
    logTemperature(currentTemp);
    lastLogTime = millis();
  }

  // Display current readings
  Serial.print("Current Temperature: ");
  Serial.print(currentTemp, 2);
  Serial.println(" °C");

  delay(500); // Delay for stability
}

void logTemperature(float temperature) {
  // Add temperature to the log
  temperatureLog[logIndex] = temperature;
  logIndex = (logIndex + 1) % maxLogSize; // Circular buffer

  // Print log to serial for demonstration
  Serial.println("Temperature Log:");
  for (int i = 0; i < maxLogSize; i++) {
    if (temperatureLog[i] > 0) {
      Serial.print(temperatureLog[i], 2);
      Serial.print(" °C ");
    }
  }
  Serial.println();
}