#include <DHT.h>

DHT dht(15, DHT22);

unsigned long startTime; // Keep track of time (start)
unsigned long elapsedTime; // Keep track of time (end) 
const unsigned long measurementInterval = 1000;  // Measurement interval in milliseconds -- 1 second
const unsigned long measurementDuration = 3 * 60 * 60 * 1000;  // Measurement duration in milliseconds (3 hours)

float temperatureSum = 0; // Takes sum of all temperature readings 
float highestTemperature = -1000; 
float lowestTemperature = 1000; 
int measurementCount = 0; // Keeps track of the number of measurements taken

void setup() {
  Serial.begin(115200);  // Initialize the serial communication
  dht.begin();
  startTime = millis(); // startTime variable initiated
}

void loop() {
  elapsedTime = millis() - startTime; // Current time subtracting startTime

  if (elapsedTime >= measurementInterval) {
    float temperatureC = dht.readTemperature();  // Read temperature in Celsius

    if (isnan(temperatureC)) { //checks if the temperature value is not a number (NaN) -- Error
      Serial.println("Failed to read temperature from DHT sensor!");
    } else {
      float temperatureF = temperatureC * 1.8 + 32;  // Convert Celsius to Fahrenheit

      temperatureSum += temperatureF; 
      measurementCount++;

      if (temperatureF > highestTemperature) { //Checks if value is higher -- if it is, updated
        highestTemperature = temperatureF;
      }

      if (temperatureF < lowestTemperature) { // Checks if value is lower -- if it is, updated
        lowestTemperature = temperatureF;
      }

      Serial.print("Temperature: ");
      Serial.print(temperatureF);
      Serial.println(" °F");
    }

    startTime = millis();
  }

  if (elapsedTime >= measurementDuration) {
    printReport();
    while (true) {
      // Infinite loop to stop further execution -- calls upon printReport once exceeding 3 hours
    }
  }

  delay(100);  // Delay between readings
}

void printReport() {
  Serial.println();
  Serial.println("----- Report -----");

  Serial.println("Average Every 10 minutes in Fahrenheit: ");
  float averageTemperature = temperatureSum / measurementCount;
  Serial.println(averageTemperature);

  Serial.print("Highest Temperature: ");
  Serial.print(highestTemperature);
  Serial.println(" °F");

  Serial.print("Lowest Temperature: ");
  Serial.print(lowestTemperature);
  Serial.println(" °F");

  Serial.println();
  Serial.print("Overall Average: ");
  Serial.print(averageTemperature);
  Serial.println(" °F");

  Serial.println("------------------");
  Serial.println();
}