#include <DHT.h>
#include <time.h>
#include "SD.h"
#include <SPI.h>
#include <cstdio>

#define DHT_PIN 28
#define DHT_TYPE DHT11
#define SD_PIN 9
float secondsToWait = 1;
char fileName[] = "dht11.csv";

unsigned long long startTimeLoop = 0;
unsigned long long endTimeLoop = 0;
File dataFile;
DHT dht(DHT_PIN, DHT_TYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();
  sleep_ms(5 * 1000);
  SD.begin(SD_PIN);

  dataFile = SD.open(fileName, FILE_WRITE);
}

void loop() {
  sleep_ms((secondsToWait * 1000) - (endTimeLoop - startTimeLoop));

  startTimeLoop = time_us_64() / (unsigned long long)1000;
  unsigned long long msSinceBoot = startTimeLoop;

  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  unsigned long long yearsSinceBoot = msSinceBoot / 1000 / 60 / 60 / 24 / 365;
  msSinceBoot -= yearsSinceBoot * 1000 * 60 * 60 * 24 * 365;

  unsigned long long daysSinceBoot = msSinceBoot / 1000 / 60 / 60 / 24;
  msSinceBoot -= daysSinceBoot * 1000 * 60 * 60 * 24;

  unsigned long long hoursSinceBoot = msSinceBoot / 1000 / 60 / 60;
  msSinceBoot -= hoursSinceBoot * 1000 * 60 * 60;

  unsigned long long minutesSinceBoot = msSinceBoot / 1000 / 60;
  msSinceBoot -= minutesSinceBoot * 1000 * 60;

  unsigned long long secondsSinceBoot = msSinceBoot / 1000;
  msSinceBoot -= secondsSinceBoot * 1000;

  char output[100];
  sprintf(output, "%lluY:%lluD:%lluh:%llum:%llus:%llums   -   Temperature = %.2f°C   -   Humidity = %.2f%%\n", yearsSinceBoot, daysSinceBoot, hoursSinceBoot, minutesSinceBoot, secondsSinceBoot, msSinceBoot, temperature, humidity);
  Serial.print(output);

  sprintf(output, "%lluY:%lluD:%lluh:%llum:%llus:%llums,%.2f°C,%.2f%%\n", yearsSinceBoot, daysSinceBoot, hoursSinceBoot, minutesSinceBoot, secondsSinceBoot, msSinceBoot, temperature, humidity);
  dataFile.print(output);
  
  endTimeLoop = time_us_64() / (unsigned long long)1000;
}