// matth-x/ESP8266-OCPP

// Copyright Matthias Akstaller 2019 - 2021

// MIT License

#include <ArduinoOcpp/TimeHelper.h>

#include <Arduino.h>

#include <string.h>

#include <ctype.h>

namespace ArduinoOcpp {

/**

* Expects a date string like

* 2020-10-01T20:53:32.486Z

*

* as generated in JavaScript by calling toJSON() on a Date object

*

* Only processes the first 19 characters. The subsequent are ignored until terminating 0.

*

* Has a semi-sophisticated type check included. Will return true on successful time set and false if

* the given string is not a JSON Date string.

*

* jsonDateString: 0-terminated string

*/

bool setTimeFromJsonDateString(const char* jsonDateString){

time_t mDate = 0;

bool success = getTimeFromJsonDateString(jsonDateString, &mDate);

if (success) {

setTime(mDate);

}

return success;

}

bool getTimeFromJsonDateString(const char* jsonDateString, time_t *result){

const int JSONDATE_MINLENGTH = 19;

if (strlen(jsonDateString) < JSONDATE_MINLENGTH){

return false;

}

if (!isdigit(jsonDateString[0]) || //2

!isdigit(jsonDateString[1]) || //0

!isdigit(jsonDateString[2]) || //1

!isdigit(jsonDateString[3]) || //3

jsonDateString[4] != '-' || //-

!isdigit(jsonDateString[5]) || //0

!isdigit(jsonDateString[6]) || //2

jsonDateString[7] != '-' || //-

!isdigit(jsonDateString[8]) || //0

!isdigit(jsonDateString[9]) || //1

jsonDateString[10] != 'T' || //T

!isdigit(jsonDateString[11]) || //2

!isdigit(jsonDateString[12]) || //0

jsonDateString[13] != ':' || //:

!isdigit(jsonDateString[14]) || //5

!isdigit(jsonDateString[15]) || //3

jsonDateString[16] != ':' || //:

!isdigit(jsonDateString[17]) || //3

!isdigit(jsonDateString[18])) { //2

//ignore subsequent characters

return false;

}

int year = (jsonDateString[0] - '0') * 1000 +

(jsonDateString[1] - '0') * 100 +

(jsonDateString[2] - '0') * 10 +

(jsonDateString[3] - '0');

int month = (jsonDateString[5] - '0') * 10 +

(jsonDateString[6] - '0');

int day = (jsonDateString[8] - '0') * 10 +

(jsonDateString[9] - '0');

int hour = (jsonDateString[11] - '0') * 10 +

(jsonDateString[12] - '0');

int minute = (jsonDateString[14] - '0') * 10 +

(jsonDateString[15] - '0');

int second = (jsonDateString[17] - '0') * 10 +

(jsonDateString[18] - '0');

//ignore fractals

if (year < 1970 || year > 2100 ||

month < 1 || month > 12 ||

day < 1 || day > 31 ||

hour < 0 || hour > 23 ||

minute < 0 || minute > 59 ||

second < 0 || second > 59) {

return false;

}

/*

* not-so-sophisticated type-check successfully passed

*/

TimeElements calendar = {};

calendar.Second = second;

calendar.Minute = minute;

calendar.Hour = hour;

//uint8_t Wday; // day of week, sunday is day 1

calendar.Day = day;

calendar.Month = month;

calendar.Year = CalendarYrToTm(year); // CalendarYrToTm(Y) = Y - 1970

*result = makeTime(calendar);

return true;

}

/**

* Writes the system time into jsonDateString.

*

* jsonDateString: output buffer. Must be JSONDATE_LENGTH + 1 characters long (+1 for the 0-terminator).

* Must be 0-initialized.

* bufflength: number of chars in jsonDateString

* Warning: writes up to bufflength characters into the buffer

* Returns true on success, false otherwise

*

* Example usage:

* char timestamp[JSONDATE_LENGTH + 1] = {'\0'}; //timestamp must not be shorter

* if (!getJsonDateStringFromSystemTime(timestamp, JSONDATE_LENGTH)){

* //catch error

* }

* json_document["timestamp"] = timestamp;

*/

bool getJsonDateStringFromSystemTime(char* jsonDateString, int bufflength){

return getJsonDateStringFromGivenTime(jsonDateString, bufflength, now());

}

/**

* Writes the system time into jsonDateString.

*

* jsonDateString: output buffer. Must be JSONDATE_LENGTH + 1 characters long (+1 for the 0-terminator).

* Must be 0-initialized.

* bufflength: number of chars in jsonDateString

* Warning: writes up to bufflength characters into the buffer

* Returns true on success, false otherwise

*

* Example usage:

* char timestamp[JSONDATE_LENGTH + 1] = {'\0'}; //timestamp must not be shorter

* if (!getJsonDateStringFromSystemTime(timestamp, JSONDATE_LENGTH)){

* //catch error

* }

* json_document["timestamp"] = timestamp;

*/

bool getJsonDateStringFromGivenTime(char* jsonDateString, int bufflength, time_t t){

if (bufflength < JSONDATE_LENGTH) return false;

jsonDateString[0] = ((char) ((year(t) / 1000) % 10)) + '0';

jsonDateString[1] = ((char) ((year(t) / 100) % 10)) + '0';

jsonDateString[2] = ((char) ((year(t) / 10) % 10)) + '0';

jsonDateString[3] = ((char) ((year(t) / 1) % 10)) + '0';

jsonDateString[4] = '-';

jsonDateString[5] = ((char) ((month(t) / 10) % 10)) + '0';

jsonDateString[6] = ((char) ((month(t) / 1) % 10)) + '0';

jsonDateString[7] = '-';

jsonDateString[8] = ((char) ((day(t) / 10) % 10)) + '0';

jsonDateString[9] = ((char) ((day(t) / 1) % 10)) + '0';

jsonDateString[10] = 'T';

jsonDateString[11] = ((char) ((hour(t) / 10) % 10)) + '0';

jsonDateString[12] = ((char) ((hour(t) / 1) % 10)) + '0';

jsonDateString[13] = ':';

jsonDateString[14] = ((char) ((minute(t) / 10) % 10)) + '0';

jsonDateString[15] = ((char) ((minute(t) / 1) % 10)) + '0';

jsonDateString[16] = ':';

jsonDateString[17] = ((char) ((second(t) / 10) % 10)) + '0';

jsonDateString[18] = ((char) ((second(t) / 1) % 10)) + '0';

/*

* Determining the following characters is a little bit difficult. The format is not specified by

* OCPP and depends strongly on the internal implementation of the server this client should be

* connected to.

*

* However, the OCPP-J 1.6 document suggests to stick to the JSON Date format

* 2013-02-01T20:53:32.486Z

*

* Other possibilities are commented out and could be reused if necessary

*/

/* 5 fractal digits and timezone specification

jsonDateString[19] = '.';

jsonDateString[20] = '0'; //ignore fractals

jsonDateString[21] = '0';

jsonDateString[22] = '0';

jsonDateString[23] = '0';

jsonDateString[24] = '0';

jsonDateString[25] = '0';

jsonDateString[26] = '+';

jsonDateString[27] = '0'; //timezone set to +00:00

jsonDateString[28] = '0';

jsonDateString[29] = ':';

jsonDateString[30] = '0';

jsonDateString[31] = '0'; */

/* No fractal digits and timezone specification

jsonDateString[19] = '+';

jsonDateString[20] = '0'; //ignore fractals

jsonDateString[21] = '0';

jsonDateString[22] = ':';

jsonDateString[23] = '0';

jsonDateString[24] = '0'; */

/* JSON Date variant. 3 fractal digits and subsequent 'Z' */

jsonDateString[19] = '.';

jsonDateString[20] = '0'; //ignore fractals

jsonDateString[21] = '0';

jsonDateString[22] = '0';

jsonDateString[23] = 'Z';

return true;

}

time_t minimum(time_t t1, time_t t2) {

if (t1 < t2) {

return t1;

} else {

return t2;

}

}

void printTime(time_t t) {

Serial.print(year(t));

Serial.print(F("-"));

Serial.print(month(t));

Serial.print(F("-"));

Serial.print(day(t));

Serial.print(F(", "));

Serial.print(hour(t));

Serial.print(F(":"));

Serial.print(minute(t));

Serial.print(F(":"));

Serial.print(second(t));

}

} //end namespace ArduinoOcpp