#include <SPI.h>
#include <SD.h>
#include <DallasTemperature.h>
#include <OneWire.h>
#include<EEPROM.h>
#include <ESP8266WiFi.h>
#include<Wire.h>
#include <RtcDS3231.h>

#define ONE_WIRE_BUS 9
//const int chipSelect = 4;
RtcDS3231<TwoWire> rtcObject(Wire);
OneWire oneWire(ONE_WIRE_BUS);
DeviceAddress Thermometer;
DallasTemperature sensors(&oneWire);
int inc=0;
String SensorID;
int deviceCount = 0;

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(115200);
  sensors.begin();
rtcObject.Begin();
  delay(10000);
  Serial.println("Technoman Pvt Ltd");
  Serial.println("Data Logger Version 2");
  Serial.println("Initializing CPU .......");
  Serial.println("EEPROM Begin");
  Serial.println("Serial Begin");
  Serial.println("RTC begin");
       //Starts I2C

  RtcDateTime currentTime = RtcDateTime(__DATE__, __TIME__); //define date and time object // input the time stamp from the software api
  rtcObject.SetDateTime(currentTime);



  Serial.print("ESP Board MAC Address:  ");
  Serial.println(WiFi.macAddress());
  Serial.println("Initialising Sensor");
  Serial.println("Locating devices...");
  Serial.print("Found ");
  deviceCount = sensors.getDeviceCount();
  Serial.print(deviceCount, DEC);
  Serial.println(" devices.");
  Serial.println("");
  Serial.println("Printing addresses...");
  for (int i = 0;  i < deviceCount;  i++)
  {
    Serial.print("Sensor ");
    Serial.print(i + 1);
    Serial.print(" : ");
    sensors.getAddress(Thermometer, i);
    SensorID = printAddress(Thermometer);
    Serial.println("Sensor ID :");
    Serial.println(SensorID);
  }
  Serial.print("Initializing SD card...");

  // see if the card is present and can be initialized:
  if (!SD.begin(4)) {
    Serial.println("Card failed, or not present");
    // don't do anything more:
    return;
  }
  Serial.println("card initialized.");
}

void loop(){
  inc ++;

  RtcDateTime currentTime = rtcObject.GetDateTime();
   char str[20];   //declare a string as an array of chars

  sprintf(str, "%d/%d/%d %d:%d:%d",     //%d allows to print an integer to the string
          currentTime.Year(),   //get year method
          currentTime.Month(),  //get month method
          currentTime.Day(),    //get day method
          currentTime.Hour(),   //get hour method
          currentTime.Minute(), //get minute method
          currentTime.Second()  //get second method
         );
         Serial.println(str);
          sensors.requestTemperatures();
  // make a string for assembling the data to log:
  String dataString = String(inc)+ "!!" + str +"!!" +String(WiFi.macAddress()) +"!!" +String(SensorID)+  "!!" + String(sensors.getTempCByIndex(0))+"!!"+String(battery_level()) ;
   File myFile = SD.open("datalog.csv", FILE_WRITE);
  if (myFile && SD.begin(4)){
    Serial.print("Writing to test.txt...");

    myFile.println(dataString);
    // close the file:
    myFile.close();
    Serial.println("done.");
  } else {

    Serial.println("error opening test.txt or SD card not found");

  Serial.println("Temperature is: ");
  Serial.println(sensors.getTempCByIndex(0));
   dataString += ",";
    delay(500);


  // open the file. note that only one file can be open at a time,
  // so you have to close this one before opening another.

  }

  // if the file is available, write to it:
//  if (dataFile) {
//    dataFile.println(dataString);
//    dataFile.close();
//    delay(60000);
    // print to the serial port too:
    Serial.println(dataString);
  //}
  // if the file isn't open, pop up an error:
//  else { Serial.println("error opening datalog.csv"); }
delay(60000);
}


String printAddress(DeviceAddress deviceAddress)
{ String hex_add;
  for (uint8_t i = 0; i < 8; i++)
  {

    if (deviceAddress[i] < 10) {
      Serial.print("0");
      hex_add += String("0");
    }
    Serial.print(deviceAddress[i], HEX);
    hex_add += String(deviceAddress[i], HEX);


    //Serial.println(hex_add);
  }
  Serial.println("");
  return hex_add;
}
float battery_level(){
  float bat_level = ((analogRead(A0)*3.7)/1024)*2;
   return bat_level;
}