#include <RTClib.h>
#include <SdFat.h>
#include <LiquidCrystal.h>
#include <DHT.h>

#define DHTPIN_1 A0
#define DHTPIN_2 A1
#define DHTPIN_3 A2
#define DHTPIN_4 A3
#define DHTPIN_5 2
#define DHTPIN_6 3
#define DHTTYPE DHT22

DHT dht_1(DHTPIN_1, DHTTYPE);
DHT dht_2(DHTPIN_2, DHTTYPE);
DHT dht_3(DHTPIN_3, DHTTYPE);
DHT dht_4(DHTPIN_4, DHTTYPE);
DHT dht_5(DHTPIN_5, DHTTYPE);
DHT dht_6(DHTPIN_6, DHTTYPE);

LiquidCrystal lcd(9, 8, 7, 6, 5, 4);

const int chipSelect = 10;
const int interval = 10000;

RTC_DS1307 rtc;

SdFat SD;

DateTime lastFileTime;

String filename = "";
File dataFile;

void setup() {
  Serial.begin(9600);
  while (!Serial) {
    ; // Wait for serial port to connect. Needed for native USB port only
  }

  dht_1.begin();
  dht_2.begin();
  dht_3.begin();
  dht_4.begin();
  dht_5.begin();
  dht_6.begin();

  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  if (!rtc.isrunning()) {
    Serial.println("RTC is NOT running, let's set the time!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    return;
  }
  Serial.println("card initialized.");

  lcd.begin(16, 2);

  DateTime now = rtc.now();
  lastFileTime = DateTime(now.year(), now.month(), now.day());
}

void loop() {
  DateTime now = rtc.now();

  float temperature_1 = dht_1.readTemperature();
  float temperature_2 = dht_2.readTemperature();
  float temperature_3 = dht_3.readTemperature();
  float temperature_4 = dht_4.readTemperature();
  float temperature_5 = dht_5.readTemperature();
  float temperature_6 = dht_6.readTemperature();

  if (isnan(temperature_1) || isnan(temperature_2) || isnan(temperature_3) || 
      isnan(temperature_4) || isnan(temperature_5) || isnan(temperature_6)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Temp1: ");
  Serial.print(temperature_1);
  Serial.print(" *C\t");

  Serial.print("Temp2: ");
  Serial.print(temperature_2);
  Serial.print(" *C\t");

  Serial.print("Temp3: ");
  Serial.print(temperature_3);
  Serial.println(" *C\t");

  Serial.print("Temp4: ");
  Serial.print(temperature_4);
  Serial.print(" *C\t");

  Serial.print("Temp5: ");
  Serial.print(temperature_5);
  Serial.print(" *C\t");

  Serial.print("Temp6: ");
  Serial.print(temperature_6);
  Serial.println(" *C");

  if (now.hour() == lastFileTime.hour() && now.minute() == lastFileTime.minute() && now.second() == lastFileTime.second()) {
    // File is already open, just write data
    dataFile.print(now.timestamp());
    dataFile.print(",");
    dataFile.print(temperature_1);
    dataFile.print(",");
    dataFile.print(temperature_2);
    dataFile.print(",");
    dataFile.print(temperature_3);
    dataFile.print(",");
    dataFile.print(temperature_4);
    dataFile.print(",");
    dataFile.print(temperature_5);
    dataFile.print(",");
    dataFile.println(temperature_6);
    dataFile.close();
    Serial.println("Data logged.");
  } else {
    // New file, create a new CSV file
    filename = String(now.year()) + "_" + String(now.month()) + "_" + String(now.day()) + ".csv";
    dataFile = SD.open(filename, FILE_WRITE);
    if (dataFile) {
      lastFileTime = now;
      dataFile.print(now.timestamp());
      dataFile.print(",");
      dataFile.print(temperature_1);
      dataFile.print(",");
      dataFile.print(temperature_2);
      dataFile.print(",");
      dataFile.print(temperature_3);
      dataFile.print(",");
      dataFile.print(temperature_4);
      dataFile.print(",");
      dataFile.print(temperature_5);
      dataFile.print(",");
      dataFile.println(temperature_6);
      dataFile.close();
      Serial.println("Data logged.");
    } else {
      Serial.println("Error creating new CSV file");
    }
  }

  // Display readings from sensors 1, 2, 3 on the top row
  lcd.setCursor(0, 0);
  lcd.print(temperature_1, 1);
  lcd.print(" ");
  lcd.print(temperature_2, 1);
  lcd.print(" ");
  lcd.print(temperature_3, 1);

  // Display readings from sensors 4, 5, 6 on the bottom row
  lcd.setCursor(0, 1);
  lcd.print(temperature_4, 1);
  lcd.print(" ");
  lcd.print(temperature_5, 1);
  lcd.print(" ");
  lcd.print(temperature_6, 1);

  delay(interval);

}