/**
 * @package ACF
 * @author  WP Engine
 *
 * © 2025 Advanced Custom Fields (ACF®). All rights reserved.
 * "ACF" is a trademark of WP Engine.
 * Licensed under the GNU General Public License v2 or later.
 * https://www.gnu.org/licenses/gpl-2.0.html
 */

/**
 * Process updating bidirectional fields.
 *
 * @since 6.2
 *
 * @param array          $target_item_ids The post, user or term IDs which should be updated with the origin item ID.
 * @param integer|string $post_id         The ACF encoded origin post, user or term ID.
 * @param array          $field           The field being updated on the origin post, user or term ID.
 * @param string|false   $target_prefix   The ACF prefix for a post, user or term ID required for the update_field call for this field type.
 */
function acf_update_bidirectional_values( $target_item_ids, $post_id, $field, $target_prefix = false ) {

	// Bail early if we're already updating a bidirectional relationship to prevent recursion.
	if ( acf_get_data( 'acf_doing_bidirectional_update' ) ) {
		return;
	}

	// Support disabling bidirectionality globally.
	if ( ! acf_get_setting( 'enable_bidirection' ) ) {
		return;
	}

	if ( empty( $field['bidirectional'] ) || empty( $field['bidirectional_target'] ) ) {
		return;
	}

	$decoded            = acf_decode_post_id( $post_id );
	$item_id            = $decoded['id'];
	$valid_target_types = acf_get_valid_bidirectional_target_types( $decoded['type'] );
	$valid_targets      = array();

	foreach ( $field['bidirectional_target'] as $target_field ) {
		$target_field_object = get_field_object( $target_field );
		if ( empty( $target_field_object ) || ! is_array( $target_field_object ) ) {
			continue;
		}
		if ( in_array( $target_field_object['type'], $valid_target_types, true ) ) {
			$valid_targets[] = $target_field;
		}
	}

	if ( ! empty( $valid_targets ) ) {

		// Get current values for this field.
		$current_values = array_filter( acf_get_array( get_field( $field['key'], $post_id, false ) ) );
		$new_values     = array_filter( acf_get_array( $target_item_ids ) );

		$additions    = array_diff( $new_values, $current_values );
		$subtractions = array_diff( $current_values, $new_values );

		// Prefix additions and subtractions for destinations which aren't posts.
		if ( ! empty( $target_prefix ) ) {
			$mapper       = function ( $v ) use ( $target_prefix ) {
				return $target_prefix . '_' . $v;
			};
			$additions    = array_map( $mapper, $additions );
			$subtractions = array_map( $mapper, $subtractions );
		}

		acf_set_data( 'acf_doing_bidirectional_update', true );

		// Loop over each target, processing additions and removals.
		foreach ( $valid_targets as $target_field ) {
			foreach ( $additions as $addition ) {
				$current_value = acf_get_array( get_field( $target_field, $addition, false ) );
				update_field( $target_field, array_unique( array_merge( $current_value, array( $item_id ) ) ), $addition );
			}

			foreach ( $subtractions as $subtraction ) {
				$current_value = acf_get_array( get_field( $target_field, $subtraction, false ) );
				update_field( $target_field, array_unique( array_diff( $current_value, array( $item_id ) ) ), $subtraction );
			}
		}

		acf_set_data( 'acf_doing_bidirectional_update', false );
	}
}

/**
 * Allows third party fields to enable support as a target field type for a particular object type
 *
 * @since 6.2
 *
 * @param string $object_type The object type that will be updated on the target field, such as 'term', 'user' or 'post'.
 *
 * @return array An array of valid field type names (slugs) for the target of the bidirectional field.
 */
function acf_get_valid_bidirectional_target_types( $object_type ) {
	$valid_target_types = array();
	switch ( $object_type ) {
		case 'term':
			$valid_target_types = array( 'taxonomy' );
			break;
		case 'user':
			$valid_target_types = array( 'user' );
			break;
		case 'post':
			$valid_target_types = array( 'relationship', 'post_object' );
			break;
	}
	return apply_filters( 'acf/bidirectional/supported_field_types_for_post', $valid_target_types, $object_type );
}

/**
 * Build the complete choices argument for rendering the select2 field for bidirectional target based on the currently selected choices
 *
 * @since 6.2
 *
 * @param array $choices The currently selected choices (as an array of field keys).
 *
 * @return array
 */
function acf_build_bidirectional_target_current_choices( $choices ) {
	if ( empty( $choices ) ) {
		return array();
	}

	$results = array();
	foreach ( $choices as $choice ) {
		if ( empty( $choice ) || ! is_string( $choice ) ) {
			continue;
		}

		$field_object = get_field_object( $choice );
		if ( is_array( $field_object ) && ! empty( $field_object['label'] ) ) {
			$results[ $choice ] = $field_object['label'];
		} else {
			$results[ $choice ] = $choice;
		}
	}

	return $results;
}

/**
 * Build valid fields for a bidirectional relationship for select2 display
 *
 * @since 6.2
 *
 * @param array $results The original results array.
 * @param array $options The options provided to the select2 AJAX search.
 *
 * @return array
 */
function acf_build_bidirectional_relationship_field_target_args( $results, $options ) {
	$valid_field_types = apply_filters( 'acf/bidirectional/supported_target_field_types', array( 'relationship', 'post_object', 'user', 'taxonomy' ) );

	$field_groups = array_filter(
		acf_get_field_groups(),
		function ( $field_group ) {
			return $field_group['active'];
		}
	);

	$valid_fields = array();
	foreach ( $field_groups as $field_group ) {
		$fields = acf_get_fields( $field_group );
		foreach ( $fields as $field ) {
			if ( in_array( $field['type'], $valid_field_types, true ) ) {
				if ( empty( $valid_fields[ $field_group['title'] ] ) ) {
					$valid_fields[ $field_group['title'] ] = array();
				}
				$valid_fields[ $field_group['title'] ][ $field['key'] ] = array(
					'type'  => $field['type'],
					'label' => $field['label'],
				);

				if ( isset( $options['parent_key'] ) && $options['parent_key'] === $field['key'] ) {
					$valid_fields[ $field_group['title'] ][ $field['key'] ]['this_field'] = true;
				}
			}
		}
	}

	foreach ( $valid_fields as $field_group_name => $fields ) {
		$field_group = array(
			'text'     => $field_group_name,
			'children' => array(),
		);
		foreach ( $fields as $key => $data ) {
			$field_group['children'][] = array(
				'id'               => $key,
				'text'             => $data['label'],
				'field_type'       => $data['type'],
				/* translators: %s A field type name, such as "Relationship" */
				'human_field_type' => sprintf( __( '%s Field', 'acf' ), acf_get_field_type_prop( $data['type'], 'label' ) ),
				'this_field'       => ! empty( $data['this_field'] ),
			);
		}
		$results['results'][] = $field_group;
	}

	return $results;
}

add_action( 'acf/fields/select/query/key=_acf_bidirectional_target', 'acf_build_bidirectional_relationship_field_target_args', 10, 2 );

/**
 * Renders the field settings required for bidirectional fields
 *
 * @since 6.2
 *
 * @param array $field The field object passed into field setting functions.
 */
function acf_render_bidirectional_field_settings( $field ) {
	if ( ! acf_get_setting( 'enable_bidirection' ) ) {
		return;
	}

	acf_render_field_setting(
		$field,
		array(
			'label'        => __( 'Bidirectional', 'acf' ),
			'instructions' => __( 'Update a field on the selected values, referencing back to this ID', 'acf' ),
			'type'         => 'true_false',
			'name'         => 'bidirectional',
			'ui'           => 1,
		)
	);

	acf_render_field_setting(
		$field,
		array(
			'name'       => 'bidirectional_notes',
			'type'       => 'message',
			'message'    => acf_get_bidirectional_field_settings_instruction_text(),
			'conditions' => array(
				'field'    => 'bidirectional',
				'operator' => '==',
				'value'    => 1,
			),
		)
	);

	acf_render_field_setting(
		$field,
		array(
			'type'         => 'select',
			'name'         => 'bidirectional_target',
			'label'        => __( 'Target Field', 'acf' ),
			'instructions' => __( 'Select field(s) to store the reference back to the item being updated. You may select this field. Target fields must be compatible with where this field is being displayed. For example, if this field is displayed on a Taxonomy, your target field should be of type Taxonomy', 'acf' ),
			'class'        => 'bidrectional_target',
			'choices'      => acf_build_bidirectional_target_current_choices( $field['bidirectional_target'] ),
			'conditions'   => array(
				'field'    => 'bidirectional',
				'operator' => '==',
				'value'    => 1,
			),
			'ui'           => 1,
			'multiple'     => 1,
			'ajax'         => 1,
		)
	);
}

/**
 * Returns the translated instructional text for the message field for the bidirectional field settings.
 *
 * @since 6.2
 *
 * @return string The html containing the instructional message.
 */
function acf_get_bidirectional_field_settings_instruction_text() {
	/* translators: %s the URL to ACF's bidirectional relationship documentation */
	$message = '<p class="acf-feature-notice with-warning-icon">' . sprintf( __( 'Enabling the bidirectional setting allows you to update a value in the target fields for each value selected for this field, adding or removing the Post ID, Taxonomy ID or User ID of the item being updated. For more information, please read the <a href="%s" target="_blank">documentation</a>.', 'acf' ), acf_add_url_utm_tags( 'https://www.advancedcustomfields.com/resources/bidirectional-relationships/', 'docs', 'bidirectional' ) ) . '</p>';
	return $message;
}
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	<title>Bob White &#8211; Penguin Live Online Lecture &#8211; Erdnase Magic Store</title>
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		<title>Bob White &#8211; Penguin Live Lecture (August 30th, 2015)</title>
		<link>https://erdnasemagicstore.io/product/bob-white-penguin-live-lecture-august-30th-2015/?utm_source=rss&#038;utm_medium=rss&#038;utm_campaign=bob-white-penguin-live-lecture-august-30th-2015</link>
		
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					<description><![CDATA[Learn classic card magic from one of the world's most respected card masters!

<span style="color: #00ff00;"><b>SUPPORT LIVE MAGIC. DOWNLOAD THE FULL LECTURE TODAY.</b></span>]]></description>
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<p>&nbsp;</p>
<p><em>&#8220;Bob White is magic&#8217;s best kept secret!&#8221;</em> &#8211; <strong>Bill Malone</strong></p>
<p><em>&#8220;There are only a few bona fide master magicians living in the world today, and one of them is Bob White.&#8221;</em> &#8211; <strong>Jared Kopf</strong></p>
<p><em>&#8220;Bob White has been a tremendous influence on my magic&#8221;</em> &#8211; <strong>Eric DeCamps</strong></p>
<p><em>&#8220;In an era where many magicians pay lip service to Erdnase, Bob White continues to be the embodiment of that book&#8217;s teachings.&#8221;</em> &#8211; <strong>Tom Gaudette</strong></p>
<h1>What will he teach?</h1>
<p><strong>The Flash Double</strong> A very clean and practical method for doing the double lift. Jamy Ian Swiss said it was the “most natural, unassuming, and convincing” double lift he had ever come across.</p>
<p><strong>The Fingerprint Card Trick</strong> An updated handling of the classic sucker effect that happens away from the pack. A simple, direct effect that has been in Bob’s professional repertoire for several decades.</p>
<p><strong>The Ambitious Classic Revisited</strong> A refined reworking of the Ambitious Classic that uses the ace, two, three and four.</p>
<p><strong>A Simple Coin Vanish</strong> A simplified and natural method for vanishing a coin or small object. Based on Charlie Miller’s coin vanish.</p>
<p><strong>The Lie Detector</strong> A great version of the lie detector plot performed with cards. This is a perfect trick to complement the Fingerprint Card Trick.</p>
<p><strong>Bluff Aces</strong> Bob White’s handling of the classic Marlo Ace routine.</p>
<p><strong>The Sponge Bunnies</strong> One of the most powerful tricks in close up magic. Bob has done this trick in every close up performance he has performed for over fifty years. A refined handling- including tips on managing the trick and presentation.</p>
<h1>Who is he?</h1>
<p>Bob White has been performing magic for over seventy years including over 40 years as a full time professional magician. Bob gave his first day-long seminar in 1996 titled <em>It’s a Matter of Style</em>. This seminar focused on the hallmarks of Bob’s magic: simplicity and uniformity of action. In 2005, he released his first DVD on magic, <em>Practical Card Palming</em>, to critical acclaim. This was followed by highly regarded DVD’s on the Chinese Linking Rings, the Cups and Balls, the Torn and Restored Tissue Paper, the Malini Egg Bag, and Card Magic.</p>
<p>Bob received the 2010 Performing Fellowship from the Academy of Magical Arts for his outstanding contributions to the field of performing magic. During his time in magic, Bob benefited from learning from some of the most legendary names in magic- Dai Vernon, Charlie Miller, Don Alan, and Karrell Fox. Bob is looking forward to sharing his knowledge of the craft with the audience at Penguin Magic.</p>
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