#include <TinyGPSPlus.h>
#include "DHT.h"

int DHTPIN = 21;
#define DHTTYPE DHT11
String s = "www.google.com/maps/dir/";
String Lat = "1.23";
String Lng = "1.23";

TinyGPSPlus gps;
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  Serial.println(F("DHTxx test!"));
  dht.begin();
  setupGPS_GSM();
}

void loop() {
  readDHT_Sensor();
  readGPSDATA_and_show_to_Serial();
}//end of LOOP

void setupGPS_GSM() {
  Serial2.begin(9600);
  Serial2.print("Serial2");
  Serial2.println("\r");
  Serial2.println("AT\r");
  delay(10);
  Serial.println(".");
  Serial2.println("\r");
  Serial2.println("AT+GPS=1\r");
  delay(100);
  Serial.println("|");
  Serial2.println("AT+CREG=2\r");
  delay(6000);
  Serial.println("|");
  //Serial2.print("AT+CREG?\r");
  Serial2.println("AT+CGATT=1\r");
  delay(6000);
  Serial.println("|");
  Serial2.println("AT+CGDCONT=1,\"IP\",\"WWW\"\r");
  delay(6000);
  Serial.println("|");
  // Serial2.println("AT+LOCATION=1\r");
  Serial2.println("AT+CGACT=1,1\r");
  delay(6000);
  Serial.println(".");
  //Initialize ends
  //Initialize GPS
  Serial2.println("\r");
  Serial2.println("AT+GPS=1\r");
  delay(1000);
  Serial.println(".");
  //Serial2.println("AT+GPSMD=1\r");   // Change to only GPS mode from GPS+BDS, set to 2 to revert to default.
  Serial2.println("AT+GPSRD=10\r");
  delay(100);
  Serial.println(".");
  // set SMS mode to text mode
  Serial2.println("AT+CMGF=1\r");
  delay(1000);
  Serial.println("D");
  //Serial2.println("AT+LOCATION=2\r");
  Serial.println("Setup Executed");
  Serial.println(F("FullExample.ino"));
  Serial.println(F("An extensive example of many interesting TinyGPSPlus features"));
  Serial.print(F("Testing TinyGPSPlus library v. ")); Serial.println(TinyGPSPlus::libraryVersion());
  Serial.println(F("by Mikal Hart"));
  Serial.println();
  Serial.println(F("Sats HDOP  Latitude   Longitude   Fix  Date       Time     Date Alt    Course Speed Card  Distance Course Card  Chars Sentences Checksum"));
  Serial.println(F("           (deg)      (deg)       Age                      Age  (m)    --- from GPS ----  ---- to London  ----  RX    RX        Fail"));
  Serial.println(F("----------------------------------------------------------------------------------------------------------------------------------------"));
}

void readGPSDATA_and_show_to_Serial() {
  if (gps.location.isValid()) {
    Lat = String(gps.location.lat(), 6);
    Lng = String(gps.location.lng(), 6);
    Serial.print(Lat);
    Serial.print(",");
    Serial.println(Lng);
  }
  static const double LONDON_LAT = 51.508131, LONDON_LON = -0.128002;

  printInt(gps.satellites.value(), gps.satellites.isValid(), 5);
  printFloat(gps.hdop.hdop(), gps.hdop.isValid(), 6, 1);
  printFloat(gps.location.lat(), gps.location.isValid(), 11, 6);
  printFloat(gps.location.lng(), gps.location.isValid(), 12, 6);
  printInt(gps.location.age(), gps.location.isValid(), 5);
  printDateTime(gps.date, gps.time);
  printFloat(gps.altitude.meters(), gps.altitude.isValid(), 7, 2);
  printFloat(gps.course.deg(), gps.course.isValid(), 7, 2);
  printFloat(gps.speed.kmph(), gps.speed.isValid(), 6, 2);
  printStr(gps.course.isValid() ? TinyGPSPlus::cardinal(gps.course.deg()) : "*** ", 6);

  unsigned long distanceKmToLondon =
    (unsigned long)TinyGPSPlus::distanceBetween(
      gps.location.lat(),
      gps.location.lng(),
      LONDON_LAT,
      LONDON_LON) / 1000;
  printInt(distanceKmToLondon, gps.location.isValid(), 9);

  double courseToLondon =
    TinyGPSPlus::courseTo(
      gps.location.lat(),
      gps.location.lng(),
      LONDON_LAT,
      LONDON_LON);

  printFloat(courseToLondon, gps.location.isValid(), 7, 2);

  const char *cardinalToLondon = TinyGPSPlus::cardinal(courseToLondon);

  printStr(gps.location.isValid() ? cardinalToLondon : "*** ", 6);

  printInt(gps.charsProcessed(), true, 6);
  printInt(gps.sentencesWithFix(), true, 10);
  printInt(gps.failedChecksum(), true, 9);
  Serial.println();

  smartDelay(1000);

  if (millis() > 5000 && gps.charsProcessed() < 10)
    Serial.println(F("No GPS data received: check wiring"));

}
// This custom version of delay() ensures that the gps object
// is being "fed".
static void smartDelay(unsigned long ms)
{
  unsigned long start = millis();
  do
  {
    while (Serial2.available())
      gps.encode(Serial2.read());
  } while (millis() - start < ms);
}

static void printFloat(float val, bool valid, int len, int prec)
{
  if (!valid)
  {
    while (len-- > 1)
      Serial.print('*');
    Serial.print(' ');
  }
  else
  {
    Serial.print(val, prec);
    int vi = abs((int)val);
    int flen = prec + (val < 0.0 ? 2 : 1); // . and -
    flen += vi >= 1000 ? 4 : vi >= 100 ? 3 : vi >= 10 ? 2 : 1;
    for (int i = flen; i < len; ++i)
      Serial.print(' ');
  }
  smartDelay(0);
}

static void printInt(unsigned long val, bool valid, int len)
{
  char sz[32] = "*****************";
  if (valid)
    sprintf(sz, "%ld", val);
  sz[len] = 0;
  for (int i = strlen(sz); i < len; ++i)
    sz[i] = ' ';
  if (len > 0)
    sz[len - 1] = ' ';
  Serial.print(sz);
  smartDelay(0);
}

static void printDateTime(TinyGPSDate &d, TinyGPSTime &t)
{
  if (!d.isValid())
  {
    Serial.print(F("********** "));
  }
  else
  {
    char sz[32];
    sprintf(sz, "%02d/%02d/%02d ", d.month(), d.day(), d.year());
    Serial.print(sz);
  }

  if (!t.isValid())
  {
    Serial.print(F("******** "));
  }
  else
  {
    char sz[32];
    sprintf(sz, "%02d:%02d:%02d ", t.hour(), t.minute(), t.second());
    Serial.print(sz);
  }

  printInt(d.age(), d.isValid(), 5);
  smartDelay(0);
}

static void printStr(const char *str, int len)
{
  int slen = strlen(str);
  for (int i = 0; i < len; ++i)
    Serial.print(i < slen ? str[i] : ' ');
  smartDelay(0);
}


void readDHT_Sensor() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
  float hif = dht.computeHeatIndex(f, h);
  float hic = dht.computeHeatIndex(t, h, false);
  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));
}