// matth-x/ArduinoOcpp

// Copyright Matthias Akstaller 2019 - 2021

// MIT License

#ifndef OCPPTIME_H

#define OCPPTIME_H

#include <functional>

#include <Arduino.h>

namespace ArduinoOcpp {

typedef int32_t otime_t; //requires 32bit signed integer or bigger

#define OTIME_MAX ((otime_t) INT32_MAX)

typedef std::function<otime_t()> OcppClock;

#define INFINITY_THLD (OTIME_MAX - ((otime_t) (400 * 24 * 3600))) //Upper limiter for valid time range. From this value on, a scalar time means "infinity". It's 400 days before the "year 2038" problem.

#define JSONDATE_LENGTH 24

namespace Clocks {

/*

* Basic clock implementation. Works if millis() is exact enough for you and if device doesn't go in sleep mode.

*/

extern OcppClock DEFAULT_CLOCK;

} //end namespace Clocks

class OcppTimestamp {

private:

/*

* Internal representation of the current time. The initial values correspond to UNIX-time 0. January

* corresponds to month 0 and the first day in the month is day 0.

*/

int16_t year = 1970;

int16_t month = 0;

int16_t day = 0;

int32_t hour = 0;

int32_t minute = 0;

int32_t second = 0;

public:

OcppTimestamp();

OcppTimestamp(int16_t year, int16_t month, int16_t day, int32_t hour, int32_t minute, int32_t second) :

year(year), month(month), day(day), hour(hour), minute(minute), second(second) { };

/**

* 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 setTime(const char* jsonDateString);

bool toJsonString(char *out, size_t buffsize) const;

OcppTimestamp &operator=(const OcppTimestamp &rhs);

OcppTimestamp &operator+=(int secs);

OcppTimestamp &operator-=(int secs);

otime_t operator-(const OcppTimestamp &rhs) const;

friend OcppTimestamp operator+(const OcppTimestamp &lhs, int secs);

friend OcppTimestamp operator-(const OcppTimestamp &lhs, int secs);

friend bool operator==(const OcppTimestamp &lhs, const OcppTimestamp &rhs);

friend bool operator!=(const OcppTimestamp &lhs, const OcppTimestamp &rhs);

friend bool operator<(const OcppTimestamp &lhs, const OcppTimestamp &rhs);

friend bool operator<=(const OcppTimestamp &lhs, const OcppTimestamp &rhs);

friend bool operator>(const OcppTimestamp &lhs, const OcppTimestamp &rhs);

friend bool operator>=(const OcppTimestamp &lhs, const OcppTimestamp &rhs);

};

class OcppTime {

private:

OcppTimestamp ocpp_basetime = OcppTimestamp();

otime_t system_basetime = 0; //your system clock's time at the moment when the OCPP server's time was taken

bool ocppTimeIsSet = false;

OcppClock system_clock = [] () {return (otime_t) 0;};

OcppTimestamp currentTime = OcppTimestamp();

otime_t previousUpdate = -1;

public:

OcppTime(OcppClock system_clock);

otime_t getOcppTimeScalar(); //returns current time of the OCPP server in non-UNIX but signed integer format. t2 - t1 is the time difference in seconds.

const OcppTimestamp &getOcppTimestampNow();

OcppTimestamp createTimestamp(otime_t scalar); //creates a timestamp in a JSON-serializable format. createTimestamp(getOcppTimeScalar()) will return the current OCPP time

otime_t toOcppTimeScalar(const OcppTimestamp &otimestamp);

/**

* 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 setOcppTime(const char* jsonDateString);

bool isValid() {return ocppTimeIsSet;}

};

}

#endif