#include <TinyGPS.h>
#include <SoftwareSerial.h>
#include <SD.h>

File myFile;

static const int RXPin = 4, TXPin = 3;
/* This sample code demonstrates the normal use of a TinyGPS object. */
TinyGPS gps;

/* On Teensy, the UART (real serial port) is always best to use. */
/* Unlike Arduino, there's no need to use NewSoftSerial because */
/* the "Serial" object uses the USB port, leaving the UART free. */
SoftwareSerial ss(RXPin, TXPin);

  long lat, lon;
  float flat, flon;
  unsigned long age, date, time, chars;
  int year;
  byte month, day, hour, minute, second, hundredths;
  unsigned short sentences, failed;
  int ledPin = 7;

void gpsdump(TinyGPS &gps);
void printFloat(double f, int digits = 2);

void setup()
{
  Serial.begin(115200);
  ss.begin(9600);
  pinMode(ledPin, OUTPUT);
while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }


  Serial.print("Initializing SD card...");
  // On the Ethernet Shield, CS is pin 4. It's set as an output by default.
  // Note that even if it's not used as the CS pin, the hardware SS pin 
  // (10 on most Arduino boards, 53 on the Mega) must be left as an output 
  // or the SD library functions will not work. 
   pinMode(10, OUTPUT);
   
  if (!SD.begin(10)) {
    Serial.println("initialization failed!");
    digitalWrite(ledPin, HIGH);
    return;
  }
  Serial.println("initialization done.");
  digitalWrite(ledPin, LOW);
  delay(1000);
  Serial.print("Testing TinyGPS library v. "); Serial.println(TinyGPS::library_version());
  Serial.println("by Mikal Hart");
  Serial.println();
  Serial.print("Sizeof(gpsobject) = "); Serial.println(sizeof(TinyGPS));
  Serial.println();
}

void loop()
{
  bool newdata = false;
  unsigned long start = millis();

  // Every 5 seconds we print an update
  while (millis() - start < 5000) {
    if (ss.available()) {
      char c = ss.read();
      // Serial.print(c);  // uncomment to see raw GPS data
      if (gps.encode(c)) {
        newdata = true;
        // break;  // uncomment to print new data immediately!
      }
    }
  }
  
  if (newdata) {
    Serial.println("Acquired Data");
    Serial.println("-------------");
    gpsdump(gps);
    Serial.println("-------------");
    Serial.println();
  }
  esd();
}


void esd(){
   myFile = SD.open("LOG.CSV", FILE_WRITE);
  
  // if the file opened okay, write to it:
  if (myFile) {
    Serial.print("Writing to LOG.CSV...");
myFile.print(static_cast<int>(day)); myFile.print("/"); myFile.print(static_cast<int>(month)); myFile.print("/"); 
      myFile.print(year); myFile.print(" ");

myFile.print(static_cast<int>(hour)+2); myFile.print(":"); 
    myFile.print(static_cast<int>(minute)); 
    myFile.print(",");
    
    myFile.print(flat, 5);
    myFile.print(", ");
    myFile.print(flon, 5);
    myFile.print(", ");
    myFile.print(gps.f_speed_kmph());
    myFile.println("km/h");
  // close the file:
    myFile.close();
    Serial.println("done.");
  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }
  
  // re-open the file for reading:
  myFile = SD.open("LOG.CSV");
  if (myFile) {
    Serial.println("LOG.CSV:");
    
    // read from the file until there's nothing else in it:
    while (myFile.available()) {
      Serial.write(myFile.read());
    }

    // close the file:
    myFile.close();
  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening LOG.CSV");
  }
  delay(1000);
}


void gpsdump(TinyGPS &gps)
{


  gps.get_position(&lat, &lon, &age);
  Serial.print("Lat/Long(10^-5 deg): "); Serial.print(lat); Serial.print(", "); Serial.print(lon); 
  Serial.print(" Fix age: "); Serial.print(age); Serial.println("ms.");
  
  // On Arduino, GPS characters may be lost during lengthy Serial.print()
  // On Teensy, Serial prints to USB, which has large output buffering and
  //   runs very fast, so it's not necessary to worry about missing 4800
  //   baud GPS characters.

  gps.f_get_position(&flat, &flon, &age);
  Serial.print("Lat/Long(float): "); printFloat(flat, 5); Serial.print(", "); printFloat(flon, 5);
  Serial.print(" Fix age: "); Serial.print(age); Serial.println("ms.");

  gps.get_datetime(&date, &time, &age);
  Serial.print("Date(ddmmyy): "); Serial.print(date); Serial.print(" Time(hhmmsscc): ");
    Serial.print(time);
  Serial.print(" Fix age: "); Serial.print(age); Serial.println("ms.");

  gps.crack_datetime(&year, &month, &day, &hour, &minute, &second, &hundredths, &age);
  Serial.print("Date: "); Serial.print(static_cast<int>(month)); Serial.print("/"); 
    Serial.print(static_cast<int>(day)); Serial.print("/"); Serial.print(year);
  Serial.print("  Time: "); Serial.print(static_cast<int>(hour)); Serial.print(":"); 
    Serial.print(static_cast<int>(minute)); Serial.print(":"); Serial.print(static_cast<int>(second));
    Serial.print("."); Serial.print(static_cast<int>(hundredths));
  Serial.print("  Fix age: ");  Serial.print(age); Serial.println("ms.");

  Serial.print("Alt(cm): "); Serial.print(gps.altitude()); Serial.print(" Course(10^-2 deg): ");
    Serial.print(gps.course()); Serial.print(" Speed(10^-2 knots): "); Serial.println(gps.speed());
  Serial.print("Alt(float): "); printFloat(gps.f_altitude()); Serial.print(" Course(float): ");
    printFloat(gps.f_course()); Serial.println();
  Serial.print("Speed(knots): "); printFloat(gps.f_speed_knots()); Serial.print(" (mph): ");
    printFloat(gps.f_speed_mph());
  Serial.print(" (mps): "); printFloat(gps.f_speed_mps()); Serial.print(" (kmph): ");
    printFloat(gps.f_speed_kmph()); Serial.println();

  gps.stats(&chars, &sentences, &failed);
  Serial.print("Stats: characters: "); Serial.print(chars); Serial.print(" sentences: ");
    Serial.print(sentences); Serial.print(" failed checksum: "); Serial.println(failed);
}

void printFloat(double number, int digits)
{
  // Handle negative numbers
  if (number < 0.0) {
     Serial.print('-');
     number = -number;
  }

  // Round correctly so that print(1.999, 2) prints as "2.00"
  double rounding = 0.5;
  for (uint8_t i=0; i<digits; ++i)
    rounding /= 10.0;
  
  number += rounding;

  // Extract the integer part of the number and print it
  unsigned long int_part = (unsigned long)number;
  double remainder = number - (double)int_part;
  Serial.print(int_part);

  // Print the decimal point, but only if there are digits beyond
  if (digits > 0)
    Serial.print("."); 

  // Extract digits from the remainder one at a time
  while (digits-- > 0) {
    remainder *= 10.0;
    int toPrint = int(remainder);
    Serial.print(toPrint);
    remainder -= toPrint;
  }
}