<?php

/*
* it means someone outside wp is accessing the file, in this case kill it.
*/
if (!defined('ABSPATH')) {
	die('You can not access this file!');
}


/*
* returns the date limit as a DateTime object
* or false if not set
*
*/
function get_date_limit_CIPF($user_id = null) {
	Plgntls::debug_infos();
	$acf_card_expiration = Cipf::ACF_CARD_EXPIRATION;

	/*
	* define ids
	*
	*/
	if (is_null($user_id)) {
		$user_id = get_current_user_id();
	}
	$acf_id = 'user_'.$user_id;

	/*
	* get acf date field
	*
	*/
	$current_date_limit_object = get_field_object($acf_card_expiration['_name'], $acf_id);
	if ($current_date_limit_object === false) {
		return false;
	}
	else if (empty($current_date_limit_object['value'])) {
		return false;
	}

	/*
	* create date object from acf date
	*
	*/
	$current_date_limit_string = $current_date_limit_object['value'];
	$current_format_field = $current_date_limit_object['return_format'];
	// compare 2 dates : https://stackoverflow.com/q/8722806/9497573
	// also I dont use strtotime to compare 2 ints,
	//   because i don't know if it will fail one day (2000y bug style)
	$current_date_limit = date_create_from_format($current_format_field, $current_date_limit_string);
	if ($current_date_limit === false) {
		return false;
	}

	/*
	* returns the date object
	*
	*/
	return $current_date_limit;
}


/*
* returns the diff in days between today and the expiration date of the card
* returns false if the expiration date field is empty
*
*/
function card_date_diff_CIPF($user_id = null) {
	Plgntls::debug_infos();
	/*
	* get date limit as DateTime object
	*
	*/
	$current_date_limit = get_date_limit_CIPF($user_id);
	if ($current_date_limit === false) {
		return false;
	}

	/*
	* returns diff in days
	*
	*/
	$date_now = date_create('today');
	$date_diff = date_diff($date_now, $current_date_limit);
	return (int)$date_diff->format('%R%a');
}


/*
* returns true if date is in paste or is empty
* use is_card_date_exists_CIPF to check if the field is empty
*
*/
function is_card_date_expired_CIPF($user_id = null) {
	Plgntls::debug_infos();

	/*
	* define user_id
	*
	*/
	if (is_null($user_id)) {
		$user_id = get_current_user_id();
	}

	/*
	* check if expired
	*
	*/
	$date_diff = card_date_diff_CIPF($user_id);
	if ($date_diff === false) {
		return true;
	}
	else if ($date_diff < 0) {
		return true;
	}
	return false;
}


/*
* returns true if date is empty
*
*/
function card_date_exists_CIPF($user_id = null) {
	Plgntls::debug_infos();
	$acf_card_expiration = Cipf::ACF_CARD_EXPIRATION;

	/*
	* define ids
	*
	*/
	if (is_null($user_id)) {
		$user_id = get_current_user_id();
	}
	$acf_id = 'user_'.$user_id;

	/*
	* get acf date field
	*
	*/
	$date_now = date_create('today');
	// we dont use utility fonction 'get_acf_field_CIPF' because we want to know if it was not init. Do we ?
	$current_date = get_field($acf_card_expiration['_name'], $acf_id);

	if (empty($current_date)) {
		return false;
	}
	if (is_null($current_date)) {
		return false;
	}
	return true;
}


/*
* will add card_duration to card
* card_duration is expected in a string format : https://www.php.net/manual/en/class.dateinterval.php
*
*/
function update_card_expiration_CIPF($user_id = null) {
	Plgntls::debug_infos();
	$acf_card_expiration = Cipf::ACF_CARD_EXPIRATION;
	$card_duration = Cipf::CARD_VALIDITY_TIME;

	/*
	* define acf id and acf date format
	*
	*/
	if (is_null($user_id)) {
		$user_id = get_current_user_id();
	}
	$acf_id = 'user_'.$user_id;
	$acf_date_format = 'Y-m-d H:i:s';

	/*
	* get date limit as DateTime object
	*
	*/
	$current_date_limit = get_date_limit_CIPF($user_id);
	if ($current_date_limit === false) {
		$current_date_limit = date_create('today');
	}

	/*
	* update date limit validity to add 1 year
	*
	*/
	$date_plus_one_year = $current_date_limit->add(date_interval_create_from_date_string('+'.$card_duration));
	set_acf_field_CIPF($acf_card_expiration, $date_plus_one_year->format($acf_date_format), $acf_id);
}


?>