<?php 

/*
 * acf_is_empty
 *
 * Returns true if the value provided is considered "empty". Allows numbers such as 0.
 *
 * @date	6/7/16
 * @since	5.4.0
 *
 * @param	mixed $var The value to check.
 * @return	bool
 */
function acf_is_empty( $var ) {
	return ( !$var && !is_numeric($var) );
}

/**
 * acf_not_empty
 *
 * Returns true if the value provided is considered "not empty". Allows numbers such as 0.
 *
 * @date	15/7/19
 * @since	5.8.1
 *
 * @param	mixed $var The value to check.
 * @return	bool
 */
function acf_not_empty( $var ) {
	return ( $var || is_numeric($var) );
}

/**
 * acf_uniqid
 *
 * Returns a unique numeric based id.
 *
 * @date	9/1/19
 * @since	5.7.10
 *
 * @param	string $prefix The id prefix. Defaults to 'acf'.
 * @return	string
 */
function acf_uniqid( $prefix = 'acf' ) {
	
	// Instantiate global counter.
	global $acf_uniqid;
	if( !isset($acf_uniqid) ) {
		$acf_uniqid = 1;
	}
	
	// Return id.
	return $prefix . '-' . $acf_uniqid++;
}

/**
 * acf_merge_attributes
 *
 * Merges together two arrays but with extra functionality to append class names.
 *
 * @date	22/1/19
 * @since	5.7.10
 *
 * @param	array $array1 An array of attributes.
 * @param	array $array2 An array of attributes.
 * @return	array
 */
function acf_merge_attributes( $array1, $array2 ) {
	
	// Merge together attributes.
	$array3 = array_merge( $array1, $array2 );
	
	// Append together special attributes.
	foreach( array('class', 'style') as $key ) {
		if( isset($array1[$key]) && isset($array2[$key]) ) {
			$array3[$key] = trim($array1[$key]) . ' ' . trim($array2[$key]);
		}
	}
	
	// Return.
	return $array3;
}

/**
 * acf_cache_key
 *
 * Returns a filtered cache key.
 *
 * @date	25/1/19
 * @since	5.7.11
 *
 * @param	string $key The cache key.
 * @return	string
 */
function acf_cache_key( $key = '' ) {
	
	/**
	 * Filters the cache key.
	 *
	 * @date	25/1/19
	 * @since	5.7.11
	 *
	 * @param	string $key The cache key.
	 * @param	string $original_key The original cache key.
	 */
	return apply_filters( "acf/get_cache_key", $key, $key );
}

/**
 * acf_request_args
 *
 * Returns an array of $_REQUEST values using the provided defaults.
 *
 * @date	28/2/19
 * @since	5.7.13
 *
 * @param	array $args An array of args.
 * @return	array
 */
function acf_request_args( $args = array() ) {
	foreach( $args as $k => $v ) {
		$args[ $k ] = isset($_REQUEST[ $k ]) ? $_REQUEST[ $k ] : $args[ $k ];
	}
	return $args;
}

// Register store.
acf_register_store( 'filters' );

/**
 * acf_enable_filter
 *
 * Enables a filter with the given name.
 *
 * @date	14/7/16
 * @since	5.4.0
 *
 * @param	string name The modifer name.
 * @return	void
 */
function acf_enable_filter( $name = '' ) {
	acf_get_store( 'filters' )->set( $name, true );
}

/**
 * acf_disable_filter
 *
 * Disables a filter with the given name.
 *
 * @date	14/7/16
 * @since	5.4.0
 *
 * @param	string name The modifer name.
 * @return	void
 */
function acf_disable_filter( $name = '' ) {
	acf_get_store( 'filters' )->set( $name, false );
}

/**
 * acf_is_filter_enabled
 *
 * Returns the state of a filter for the given name.
 *
 * @date	14/7/16
 * @since	5.4.0
 *
 * @param	string name The modifer name.
 * @return	array
 */
function acf_is_filter_enabled( $name = '' ) {
	return acf_get_store( 'filters' )->get( $name );
}

/**
 * acf_get_filters
 *
 * Returns an array of filters in their current state.
 *
 * @date	14/7/16
 * @since	5.4.0
 *
 * @param	void
 * @return	array
 */
function acf_get_filters() {
	return acf_get_store( 'filters' )->get();
}

/**
 * acf_set_filters
 *
 * Sets an array of filter states.
 *
 * @date	14/7/16
 * @since	5.4.0
 *
 * @param	array $filters An Array of modifers
 * @return	array
 */
function acf_set_filters( $filters = array() ) {
	acf_get_store( 'filters' )->set( $filters );
}

/**
 * acf_disable_filters
 *
 * Disables all filters and returns the previous state.
 *
 * @date	14/7/16
 * @since	5.4.0
 *
 * @param	void
 * @return	array
 */
function acf_disable_filters() {
	
	// Get state.
	$prev_state = acf_get_filters();
	
	// Set all modifers as false.
	acf_set_filters( array_map('__return_false', $prev_state) );
	
	// Return prev state.
	return $prev_state;
}

/**
 * acf_enable_filters
 *
 * Enables all or an array of specific filters and returns the previous state.
 *
 * @date	14/7/16
 * @since	5.4.0
 *
 * @param	array $filters An Array of modifers
 * @return	array
 */
function acf_enable_filters( $filters = array() ) {
	
	// Get state.
	$prev_state = acf_get_filters();
	
	// Allow specific filters to be enabled.
	if( $filters ) {
		acf_set_filters( $filters );
		
	// Set all modifers as true.	
	} else {
		acf_set_filters( array_map('__return_true', $prev_state) );
	}
	
	// Return prev state.
	return $prev_state;
}

/**
 * acf_idval
 *
 * Parses the provided value for an ID.
 *
 * @date	29/3/19
 * @since	5.7.14
 *
 * @param	mixed $value A value to parse.
 * @return	int
 */
function acf_idval( $value ) {
	
	// Check if value is numeric.
	if( is_numeric($value) ) {
		return (int) $value;
	
	// Check if value is array.	
	} elseif( is_array($value) ) {
		return (int) isset($value['ID']) ? $value['ID'] : 0;
	
	// Check if value is object.	
	} elseif( is_object($value) ) {
		return (int) isset($value->ID) ? $value->ID : 0;
	}
	
	// Return default.
	return 0;
}

/**
 * acf_maybe_idval
 *
 * Checks value for potential id value.
 *
 * @date	6/4/19
 * @since	5.7.14
 *
 * @param	mixed $value A value to parse.
 * @return	mixed
 */
function acf_maybe_idval( $value ) {
	if( $id = acf_idval( $value ) ) {
		return $id;
	}
	return $value;
}

/**
 * acf_numval
 *
 * Casts the provided value as eiter an int or float using a simple hack.
 *
 * @date	11/4/19
 * @since	5.7.14
 *
 * @param	mixed $value A value to parse.
 * @return	(int|float)
 */
function acf_numval( $value ) {
	return ( intval($value) == floatval($value) ) ? intval($value) : floatval($value);
}

/**
 * acf_idify
 *
 * Returns an id attribute friendly string.
 *
 * @date	24/12/17
 * @since	5.6.5
 *
 * @param	string $str The string to convert.
 * @return	string
 */
function acf_idify( $str = '' ) {
	return str_replace(array('][', '[', ']'), array('-', '-', ''), strtolower($str));
}

/**
 * acf_slugify
 *
 * Returns a slug friendly string.
 *
 * @date	24/12/17
 * @since	5.6.5
 *
 * @param	string $str The string to convert.
 * @param	string $glue The glue between each slug piece.
 * @return	string
 */
function acf_slugify( $str = '', $glue = '-' ) {
	return str_replace(array('_', '-', '/', ' '), $glue, strtolower($str));
}

/**
 * acf_punctify
 *
 * Returns a string with correct full stop puctuation.
 *
 * @date	12/7/19
 * @since	5.8.2
 *
 * @param	string $str The string to format.
 * @return	string
 */
function acf_punctify( $str = '' ) {
	return trim($str, '.') . '.';
}

/**
 * acf_did
 *
 * Returns true if ACF already did an event.
 *
 * @date	30/8/19
 * @since	5.8.1
 *
 * @param	string $name The name of the event.
 * @return	bool
 */
function acf_did( $name ) {
	
	// Return true if already did the event (preventing event).
	if( acf_get_data("acf_did_$name") ) {
		return true;
	
	// Otherwise, update store and return false (alowing event).
	} else {
		acf_set_data("acf_did_$name", true);
		return false;
	}
}

/**
 * Returns the length of a string that has been submitted via $_POST.
 *
 * Uses the following process:
 * 1. Unslash the string because posted values will be slashed.
 * 2. Decode special characters because wp_kses() will normalize entities.
 * 3. Treat line-breaks as a single character instead of two.
 * 4. Use mb_strlen() to accomodate special characters.
 * 
 * @date	04/06/2020
 * @since	5.9.0
 *
 * @param	string $str The string to review.
 * @return	int
 */
function acf_strlen( $str ) {
	return mb_strlen( str_replace("\r\n", "\n", wp_specialchars_decode( wp_unslash( $str ) ) ) );
}