#include <SPI.h>
#include <SD.h>
#include <Wire.h>
#include "RTClib.h"
#include <dht.h>

// Released to the public domain
// no warranty whatsoever!

dht DHT;

#define DHT22_PIN 7

#define MOISTURESENSOR1 0 // plant 7
#define MOISTURESENSOR2 2 // plant 1
#define MOISTURESENSOR3 3 // plant 6

// SD Shield pin, make sure not to use the chosen one for other sensors!
// change this to match your SD shield or module;
// Arduino Ethernet shield: pin 4
// Adafruit SD shields and modules: pin 10
// Sparkfun SD shield: pin 8
const int chipSelect = 10;

int photocellPin = 1;

// delay between averaging measurements (NOT the delay between individual measurements!)
#define MEASUREDELAY 100
// number of averaging measurements
#define MEASURECOUNT 5



Sd2Card card;
SdVolume volume;
SdFile root;

RTC_DS1307 RTC;

void setup()
{
  Serial.begin(9600);


    Wire.begin();
    RTC.begin();
   if (! RTC.isrunning()) {
    Serial.println("RTC is NOT running!");
    // following line sets the RTC to the date & time this sketch was compiled
    // uncomment it & upload to set the time, date and start run the RTC!
//    RTC.adjust(DateTime(__DATE__, __TIME__));
  }

    Serial.print("Initializing SD card...");
  // make sure that the default chip select pin is set to
  // output, even if you don't use it:
  pinMode(10, OUTPUT);




  if (!SD.begin(10)) {
    Serial.println("initialization failed!");
    return;
  }
  Serial.println("initialization done.");


   Serial.print("DHT LIBRARY VERSION: ");
  Serial.println(DHT_LIB_VERSION);
  Serial.println();


}

void loop()
{

  DateTime now = RTC.now();

//for log
    char dateTimeString[20];
sprintf (dateTimeString, "%.2d/%.2d/%.2d-%.2d:%.2d:%.2d", now.year(), now.month(), now.day(), now.hour(), now.minute(), now.second());
   String datetime(dateTimeString);

//for filename
    char dateTimeStringFilename[20];
sprintf (dateTimeStringFilename, "%.2d%.2d%.2d", now.year(), now.month(), now.day(), now.hour(), now.minute(), now.second());
   String dateTimeStringFilenameString(dateTimeStringFilename);







  // read moisture1 from moisutre sensor
float moisture = getAverageAnalog(MOISTURESENSOR1,MEASURECOUNT,MEASUREDELAY); // single top left connection, plant 7 (front plant)
float moisture2 = getAverageAnalog(MOISTURESENSOR2,MEASURECOUNT,MEASUREDELAY); // lower left connection, plant 1 (tub)
float moisture3 = getAverageAnalog(MOISTURESENSOR3,MEASURECOUNT,MEASUREDELAY); // lower right connection, plant 6 (back-right plant)

// get brightness from photocell, seems super inacurate
float photocellReading = getAverageAnalog(photocellPin,100,10);


  // read temperature and air humidity from DHT sensor
  int chk = DHT.read22(DHT22_PIN);
  switch (chk)
  {
    case DHTLIB_OK:

        break;
    case DHTLIB_ERROR_CHECKSUM:
        Serial.print("Checksum error,\t");
        break;
    case DHTLIB_ERROR_TIMEOUT:
        Serial.print("Time out error,\t");
        break;
    default:
        Serial.print("Unknown error,\t");
        break;
  }



// humidity sensor seems to be very inprecise, use measurecount * 2 !!!!!!!! (still inprecise, but a little better)
  float humidity=0;
  for (int i=0;i<MEASURECOUNT;i++)
  {
   // read and add
    humidity+=DHT.humidity;
    delay(MEASUREDELAY);
  }
  humidity = humidity/(MEASURECOUNT);



  float temperature = 0;
  for (int i=0;i<MEASURECOUNT;i++)
  {
   // read and add
    temperature+=DHT.temperature;
    delay(MEASUREDELAY);
  }
  temperature=temperature/MEASURECOUNT;







String dataString = datetime+"\t"+humidity+"\t"+temperature+"\t"+moisture+"\t"+moisture2+"\t"+moisture3+"\t"+photocellReading;


// debug to USB
Serial.println(dataString);


// apple numbers need .txt extension to open tab separated files correctly. .csv only for comma separated, eh
String filename = dateTimeStringFilenameString+".txt";
char * buffer = new char[filename.length()];
strcpy(buffer,filename.c_str());

  File dataFile = SD.open(buffer, FILE_WRITE);

  // if the file is available, write to it:
  if (dataFile) {
    dataFile.println(dataString);
    dataFile.close();
  }
  // if the file isn't open, pop up an error:
  else {
    Serial.println("error opening "+filename);
  }





  // new char[] uses malloc
  free(buffer);

  delay(60000); // 900000 = 15 minutes delay 60000=1min
}


float getAverageAnalog(int pin, int iterations, int delaySeconds)
{
    float value=0;

  for (int i=0;i<iterations;i++)
  {
   // read and add
    value+=analogRead(pin);
    delay(delaySeconds);
  }

  return value/iterations;
}



//Rounds down (via intermediary integer conversion truncation)
String doubleToString(double input,int decimalPlaces){
if(decimalPlaces!=0){
String string = String((int)(input*pow(10,decimalPlaces)));
if(abs(input)<1){
if(input>0)
string = "0"+string;
else if(input<0)
string = string.substring(0,1)+"0"+string.substring(1);
}
return string.substring(0,string.length()-decimalPlaces)+"."+string.substring(string.length()-decimalPlaces);
}
else {
return String((int)input);
}
}


//
// END OF FILE
//