<?php

// Register store.
acf_register_store( 'field-groups' )->prop( 'multisite', true );

/**
 * acf_get_field_group
 *
 * Retrieves a field group for the given identifier.
 *
 * @date    30/09/13
 * @since   5.0.0
 *
 * @param   (int|string) $id The field group ID, key or name.
 * @return  (array|false) The field group array.
 */
function acf_get_field_group( $id = 0 ) {

	// Allow WP_Post to be passed.
	if ( is_object( $id ) ) {
		$id = $id->ID;
	}

	// Check store.
	$store = acf_get_store( 'field-groups' );
	if ( $store->has( $id ) ) {
		return $store->get( $id );
	}

	// Check local fields first.
	if ( acf_is_local_field_group( $id ) ) {
		$field_group = acf_get_local_field_group( $id );

		// Then check database.
	} else {
		$field_group = acf_get_raw_field_group( $id );
	}

	// Bail early if no field group.
	if ( ! $field_group ) {
		return false;
	}

	// Validate field group.
	$field_group = acf_validate_field_group( $field_group );

	/**
	 * Filters the $field_group array after it has been loaded.
	 *
	 * @date    12/02/2014
	 * @since   5.0.0
	 *
	 * @param   array The field_group array.
	 */
	$field_group = apply_filters( 'acf/load_field_group', $field_group );

	// Store field group using aliasses to also find via key, ID and name.
	$store->set( $field_group['key'], $field_group );
	$store->alias( $field_group['key'], $field_group['ID'] );

	// Return.
	return $field_group;
}

/**
 * acf_get_raw_field_group
 *
 * Retrieves raw field group data for the given identifier.
 *
 * @date    18/1/19
 * @since   5.7.10
 *
 * @param   (int|string) $id The field ID, key or name.
 * @return  (array|false) The field group array.
 */
function acf_get_raw_field_group( $id = 0 ) {

	// Get raw field group from database.
	$post = acf_get_field_group_post( $id );
	if ( ! $post ) {
		return false;
	}

	// Bail early if incorrect post type.
	if ( $post->post_type !== 'acf-field-group' ) {
		return false;
	}

	// Unserialize post_content.
	$field_group = (array) maybe_unserialize( $post->post_content );

	// update attributes
	$field_group['ID']         = $post->ID;
	$field_group['title']      = $post->post_title;
	$field_group['key']        = $post->post_name;
	$field_group['menu_order'] = $post->menu_order;
	$field_group['active']     = in_array( $post->post_status, array( 'publish', 'auto-draft' ) );

	// Return field.
	return $field_group;
}

/**
 * acf_get_field_group_post
 *
 * Retrieves the field group's WP_Post object.
 *
 * @date    18/1/19
 * @since   5.7.10
 *
 * @param   (int|string) $id The field group's ID, key or name.
 * @return  (array|false) The field group's array.
 */
function acf_get_field_group_post( $id = 0 ) {

	// Get post if numeric.
	if ( is_numeric( $id ) ) {
		return get_post( $id );

		// Search posts if is string.
	} elseif ( is_string( $id ) ) {

		// Try cache.
		$cache_key = acf_cache_key( "acf_get_field_group_post:key:$id" );
		$post_id   = wp_cache_get( $cache_key, 'acf' );
		if ( $post_id === false ) {

			// Query posts.
			$posts = get_posts(
				array(
					'posts_per_page'         => 1,
					'post_type'              => 'acf-field-group',
					'post_status'            => array( 'publish', 'acf-disabled', 'trash' ),
					'orderby'                => 'menu_order title',
					'order'                  => 'ASC',
					'suppress_filters'       => false,
					'cache_results'          => true,
					'update_post_meta_cache' => false,
					'update_post_term_cache' => false,
					'acf_group_key'          => $id,
				)
			);

			// Update $post_id with a non false value.
			$post_id = $posts ? $posts[0]->ID : 0;

			// Update cache.
			wp_cache_set( $cache_key, $post_id, 'acf' );
		}

		// Check $post_id and return the post when possible.
		if ( $post_id ) {
			return get_post( $post_id );
		}
	}

	// Return false by default.
	return false;
}

/**
 * acf_is_field_group_key
 *
 * Returns true if the given identifier is a field group key.
 *
 * @date    6/12/2013
 * @since   5.0.0
 *
 * @param   string $id The identifier.
 * @return  bool
 */
function acf_is_field_group_key( $id = '' ) {

	// Check if $id is a string starting with "group_".
	if ( is_string( $id ) && substr( $id, 0, 6 ) === 'group_' ) {
		return true;
	}

	/**
	 * Filters whether the $id is a field group key.
	 *
	 * @date    23/1/19
	 * @since   5.7.10
	 *
	 * @param   bool $bool The result.
	 * @param   string $id The identifier.
	 */
	return apply_filters( 'acf/is_field_group_key', false, $id );
}

/**
 * acf_validate_field_group
 *
 * Ensures the given field group is valid.
 *
 * @date    18/1/19
 * @since   5.7.10
 *
 * @param   array $field The field group array.
 * @return  array
 */
function acf_validate_field_group( $field_group = array() ) {

	// Bail early if already valid.
	if ( is_array( $field_group ) && ! empty( $field_group['_valid'] ) ) {
		return $field_group;
	}

	// Apply defaults.
	$field_group = wp_parse_args(
		$field_group,
		array(
			'ID'                    => 0,
			'key'                   => '',
			'title'                 => '',
			'fields'                => array(),
			'location'              => array(),
			'menu_order'            => 0,
			'position'              => 'normal',
			'style'                 => 'default',
			'label_placement'       => 'top',
			'instruction_placement' => 'label',
			'hide_on_screen'        => array(),
			'active'                => true,
			'description'           => '',
			'show_in_rest'          => false,
		)
	);

	// Convert types.
	$field_group['ID']         = (int) $field_group['ID'];
	$field_group['menu_order'] = (int) $field_group['menu_order'];
	$field_group['active']     = (bool) $field_group['active'];

	// Field group is now valid.
	$field_group['_valid'] = true;

	/**
	 * Filters the $field_group array to validate settings.
	 *
	 * @date    12/02/2014
	 * @since   5.0.0
	 *
	 * @param   array $field_group The field group array.
	 */
	$field_group = apply_filters( 'acf/validate_field_group', $field_group );

	// return
	return $field_group;
}

/**
 * acf_get_valid_field_group
 *
 * Ensures the given field group is valid.
 *
 * @date        28/09/13
 * @since       5.0.0
 *
 * @param   array $field_group The field group array.
 * @return  array
 */
function acf_get_valid_field_group( $field_group = false ) {
	return acf_validate_field_group( $field_group );
}

/**
 * acf_translate_field_group
 *
 * Translates a field group's settings.
 *
 * @date    8/03/2016
 * @since   5.3.2
 *
 * @param   array $field_group The field group array.
 * @return  array
 */
function acf_translate_field_group( $field_group = array() ) {

	// Get settings.
	$l10n            = acf_get_setting( 'l10n' );
	$l10n_textdomain = acf_get_setting( 'l10n_textdomain' );

	// Translate field settings if textdomain is set.
	if ( $l10n && $l10n_textdomain ) {

		$field_group['title'] = acf_translate( $field_group['title'] );

		/**
		 * Filters the $field group array to translate strings.
		 *
		 * @date    12/02/2014
		 * @since   5.0.0
		 *
		 * @param   array $field_group The field group array.
		 */
		$field_group = apply_filters( 'acf/translate_field_group', $field_group );
	}

	// Return field.
	return $field_group;
}

// Translate field groups passing through validation.
add_action( 'acf/validate_field_group', 'acf_translate_field_group' );


/**
 * acf_get_field_groups
 *
 * Returns and array of field_groups for the given $filter.
 *
 * @date    30/09/13
 * @since   5.0.0
 *
 * @param   array $filter An array of args to filter results by.
 * @return  array
 */
function acf_get_field_groups( $filter = array() ) {

	// Vars.
	$field_groups = array();

	// Check database.
	$raw_field_groups = acf_get_raw_field_groups();
	if ( $raw_field_groups ) {
		foreach ( $raw_field_groups as $raw_field_group ) {
			$field_groups[] = acf_get_field_group( $raw_field_group['ID'] );
		}
	}

	/**
	 * Filters the $field_groups array.
	 *
	 * @date    12/02/2014
	 * @since   5.0.0
	 *
	 * @param   array $field_groups The array of field_groups.
	 */
	$field_groups = apply_filters( 'acf/load_field_groups', $field_groups );

	// Filter results.
	if ( $filter ) {
		return acf_filter_field_groups( $field_groups, $filter );
	}

	// Return field groups.
	return $field_groups;
}

/**
 * acf_get_raw_field_groups
 *
 * Returns and array of raw field_group data.
 *
 * @date    18/1/19
 * @since   5.7.10
 *
 * @param   void
 * @return  array
 */
function acf_get_raw_field_groups() {

	// Try cache.
	$cache_key = acf_cache_key( 'acf_get_field_group_posts' );
	$post_ids  = wp_cache_get( $cache_key, 'acf' );
	if ( $post_ids === false ) {

		// Query posts.
		$posts = get_posts(
			array(
				'posts_per_page'         => -1,
				'post_type'              => 'acf-field-group',
				'orderby'                => 'menu_order title',
				'order'                  => 'ASC',
				'suppress_filters'       => false, // Allow WPML to modify the query
				'cache_results'          => true,
				'update_post_meta_cache' => false,
				'update_post_term_cache' => false,
				'post_status'            => array( 'publish', 'acf-disabled' ),
			)
		);

		// Update $post_ids with a non false value.
		$post_ids = array();
		foreach ( $posts as $post ) {
			$post_ids[] = $post->ID;
		}

		// Update cache.
		wp_cache_set( $cache_key, $post_ids, 'acf' );
	}

	// Loop over ids and populate array of field groups.
	$field_groups = array();
	foreach ( $post_ids as $post_id ) {
		$field_groups[] = acf_get_raw_field_group( $post_id );
	}

	// Return field groups.
	return $field_groups;
}

/**
 * acf_filter_field_groups
 *
 * Returns a filtered aray of field groups based on the given $args.
 *
 * @date    29/11/2013
 * @since   5.0.0
 *
 * @param   array $field_groups An array of field groups.
 * @param   array $args An array of location args.
 * @return  array
 */
function acf_filter_field_groups( $field_groups, $args = array() ) {

	// Loop over field groups and check visibility.
	$filtered = array();
	if ( $field_groups ) {
		foreach ( $field_groups as $field_group ) {
			if ( acf_get_field_group_visibility( $field_group, $args ) ) {
				$filtered[] = $field_group;
			}
		}
	}

	// Return filtered.
	return $filtered;
}

/**
 * acf_get_field_group_visibility
 *
 * Returns true if the given field group's location rules match the given $args.
 *
 * @date    7/10/13
 * @since   5.0.0
 *
 * @param   array $field_groups An array of field groups.
 * @param   array $args An array of location args.
 * @return  bool
 */
function acf_get_field_group_visibility( $field_group, $args = array() ) {

	// Check if active.
	if ( ! $field_group['active'] ) {
		return false;
	}

	// Check if location rules exist
	if ( $field_group['location'] ) {

		// Get the current screen.
		$screen = acf_get_location_screen( $args );

		// Loop through location groups.
		foreach ( $field_group['location'] as $group ) {

			// ignore group if no rules.
			if ( empty( $group ) ) {
				continue;
			}

			// Loop over rules and determine if all rules match.
			$match_group = true;
			foreach ( $group as $rule ) {
				if ( ! acf_match_location_rule( $rule, $screen, $field_group ) ) {
					$match_group = false;
					break;
				}
			}

			// If this group matches, show the field group.
			if ( $match_group ) {
				return true;
			}
		}
	}

	// Return default.
	return false;
}

/**
 * acf_update_field_group
 *
 * Updates a field group in the database.
 *
 * @date    21/1/19
 * @since   5.7.10
 *
 * @param   array $field_group The field group array.
 * @return  array
 */
function acf_update_field_group( $field_group ) {

	// Validate field group.
	$field_group = acf_get_valid_field_group( $field_group );

	// May have been posted. Remove slashes.
	$field_group = wp_unslash( $field_group );

	// Parse types (converts string '0' to int 0).
	$field_group = acf_parse_types( $field_group );

	// Clean up location keys.
	if ( $field_group['location'] ) {

		// Remove empty values and convert to associated array.
		$field_group['location'] = array_filter( $field_group['location'] );
		$field_group['location'] = array_values( $field_group['location'] );
		$field_group['location'] = array_map( 'array_filter', $field_group['location'] );
		$field_group['location'] = array_map( 'array_values', $field_group['location'] );
	}

	// Make a backup of field group data and remove some args.
	$_field_group = $field_group;
	acf_extract_vars( $_field_group, array( 'ID', 'key', 'title', 'menu_order', 'fields', 'active', '_valid' ) );

	// Create array of data to save.
	$save = array(
		'ID'             => $field_group['ID'],
		'post_status'    => $field_group['active'] ? 'publish' : 'acf-disabled',
		'post_type'      => 'acf-field-group',
		'post_title'     => $field_group['title'],
		'post_name'      => $field_group['key'],
		'post_excerpt'   => sanitize_title( $field_group['title'] ),
		'post_content'   => maybe_serialize( $_field_group ),
		'menu_order'     => $field_group['menu_order'],
		'comment_status' => 'closed',
		'ping_status'    => 'closed',
	);

	// Unhook wp_targeted_link_rel() filter from WP 5.1 corrupting serialized data.
	remove_filter( 'content_save_pre', 'wp_targeted_link_rel' );

	// Slash data.
	// WP expects all data to be slashed and will unslash it (fixes '\' character issues).
	$save = wp_slash( $save );

	// Update or Insert.
	if ( $field_group['ID'] ) {
		wp_update_post( $save );
	} else {
		$field_group['ID'] = wp_insert_post( $save );
	}

	// Flush field group cache.
	acf_flush_field_group_cache( $field_group );

	/**
	 * Fires immediately after a field group has been updated.
	 *
	 * @date    12/02/2014
	 * @since   5.0.0
	 *
	 * @param   array $field_group The field group array.
	 */
	do_action( 'acf/update_field_group', $field_group );

	// Return field group.
	return $field_group;
}

/**
 * _acf_apply_unique_field_group_slug
 *
 * Allows full control over 'acf-field-group' slugs.
 *
 * @date    21/1/19
 * @since   5.7.10
 *
 * @param string $slug          The post slug.
 * @param int    $post_ID       Post ID.
 * @param string $post_status   The post status.
 * @param string $post_type     Post type.
 * @param int    $post_parent   Post parent ID
 * @param string $original_slug The original post slug.
 */
function _acf_apply_unique_field_group_slug( $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug ) {

	// Check post type and reset to original value.
	if ( $post_type === 'acf-field-group' ) {
		return $original_slug;
	}

	// Return slug.
	return $slug;
}

// Hook into filter.
add_filter( 'wp_unique_post_slug', '_acf_apply_unique_field_group_slug', 999, 6 );

/**
 * acf_flush_field_group_cache
 *
 * Deletes all caches for this field group.
 *
 * @date    22/1/19
 * @since   5.7.10
 *
 * @param   array $field_group The field group array.
 * @return  void
 */
function acf_flush_field_group_cache( $field_group ) {

	// Delete stored data.
	acf_get_store( 'field-groups' )->remove( $field_group['key'] );

	// Flush cached post_id for this field group's key.
	wp_cache_delete( acf_cache_key( "acf_get_field_group_post:key:{$field_group['key']}" ), 'acf' );

	// Flush cached array of post_ids for collection of field groups.
	wp_cache_delete( acf_cache_key( 'acf_get_field_group_posts' ), 'acf' );
}

/**
 * acf_delete_field_group
 *
 * Deletes a field group from the database.
 *
 * @date    21/1/19
 * @since   5.7.10
 *
 * @param   (int|string) $id The field group ID, key or name.
 * @return  bool True if field group was deleted.
 */
function acf_delete_field_group( $id = 0 ) {

	// Disable filters to ensure ACF loads data from DB.
	acf_disable_filters();

	// Get the field_group.
	$field_group = acf_get_field_group( $id );

	// Bail early if field group was not found.
	if ( ! $field_group || ! $field_group['ID'] ) {
		return false;
	}

	// Delete fields.
	$fields = acf_get_fields( $field_group );
	if ( $fields ) {
		foreach ( $fields as $field ) {
			acf_delete_field( $field['ID'] );
		}
	}

	// Delete post.
	wp_delete_post( $field_group['ID'], true );

	// Flush field group cache.
	acf_flush_field_group_cache( $field_group );

	/**
	 * Fires immediately after a field group has been deleted.
	 *
	 * @date    12/02/2014
	 * @since   5.0.0
	 *
	 * @param   array $field_group The field group array.
	 */
	do_action( 'acf/delete_field_group', $field_group );

	// Return true.
	return true;
}

/**
 * acf_trash_field_group
 *
 * Trashes a field group from the database.
 *
 * @date    2/10/13
 * @since   5.0.0
 *
 * @param   (int|string) $id The field group ID, key or name.
 * @return  bool True if field group was trashed.
 */
function acf_trash_field_group( $id = 0 ) {

	// Disable filters to ensure ACF loads data from DB.
	acf_disable_filters();

	// Get the field_group.
	$field_group = acf_get_field_group( $id );

	// Bail early if field_group was not found.
	if ( ! $field_group || ! $field_group['ID'] ) {
		return false;
	}

	// Trash fields.
	$fields = acf_get_fields( $field_group );
	if ( $fields ) {
		foreach ( $fields as $field ) {
			acf_trash_field( $field['ID'] );
		}
	}

	// Trash post.
	wp_trash_post( $field_group['ID'], true );

	// Flush field group cache.
	acf_flush_field_group_cache( $field_group );

	/**
	 * Fires immediately after a field_group has been trashed.
	 *
	 * @date    12/02/2014
	 * @since   5.0.0
	 *
	 * @param   array $field_group The field_group array.
	 */
	do_action( 'acf/trash_field_group', $field_group );

	// Return true.
	return true;
}

/**
 * acf_untrash_field_group
 *
 * Restores a field_group from the trash.
 *
 * @date    2/10/13
 * @since   5.0.0
 *
 * @param   (int|string) $id The field_group ID, key or name.
 * @return  bool True if field_group was trashed.
 */
function acf_untrash_field_group( $id = 0 ) {

	// Disable filters to ensure ACF loads data from DB.
	acf_disable_filters();

	// Get the field_group.
	$field_group = acf_get_field_group( $id );

	// Bail early if field_group was not found.
	if ( ! $field_group || ! $field_group['ID'] ) {
		return false;
	}

	// Untrash fields.
	$fields = acf_get_fields( $field_group );
	if ( $fields ) {
		foreach ( $fields as $field ) {
			acf_untrash_field( $field['ID'] );
		}
	}

	// Untrash post.
	wp_untrash_post( $field_group['ID'], true );

	// Flush field group cache.
	acf_flush_field_group_cache( $field_group );

	/**
	 * Fires immediately after a field_group has been trashed.
	 *
	 * @date    12/02/2014
	 * @since   5.0.0
	 *
	 * @param   array $field_group The field_group array.
	 */
	do_action( 'acf/untrash_field_group', $field_group );

	// Return true.
	return true;
}

/**
 * Filter callback which returns the previous post_status instead of "draft" for the "acf-field-group" post type.
 *
 * Prior to WordPress 5.6.0, this filter was not needed as restored posts were always assigned their original status.
 *
 * @since 5.9.5
 *
 * @param string $new_status      The new status of the post being restored.
 * @param int    $post_id         The ID of the post being restored.
 * @param string $previous_status The status of the post at the point where it was trashed.
 * @return string.
 */
function _acf_untrash_field_group_post_status( $new_status, $post_id, $previous_status ) {
	return ( get_post_type( $post_id ) === 'acf-field-group' ) ? $previous_status : $new_status;
}

add_action( 'wp_untrash_post_status', '_acf_untrash_field_group_post_status', 10, 3 );

/**
 * acf_is_field_group
 *
 * Returns true if the given params match a field group.
 *
 * @date    21/1/19
 * @since   5.7.10
 *
 * @param   array $field_group The field group array.
 * @param   mixed $id An optional identifier to search for.
 * @return  bool
 */
function acf_is_field_group( $field_group = false ) {
	return (
		is_array( $field_group )
		&& isset( $field_group['key'] )
		&& isset( $field_group['title'] )
	);
}

/**
 * acf_duplicate_field_group
 *
 * Duplicates a field group.
 *
 * @date    16/06/2014
 * @since   5.0.0
 *
 * @param   (int|string) $id The field_group ID, key or name.
 * @param   int          $new_post_id Optional post ID to override.
 * @return  array The new field group.
 */
function acf_duplicate_field_group( $id = 0, $new_post_id = 0 ) {

	// Disable filters to ensure ACF loads data from DB.
	acf_disable_filters();

	// Get the field_group.
	$field_group = acf_get_field_group( $id );

	// Bail early if field_group was not found.
	if ( ! $field_group || ! $field_group['ID'] ) {
		return false;
	}

	// Get fields.
	$fields = acf_get_fields( $field_group );

	// Update attributes.
	$field_group['ID']  = $new_post_id;
	$field_group['key'] = uniqid( 'group_' );

	// Add (copy) to title when apropriate.
	if ( ! $new_post_id ) {
		$field_group['title'] .= ' (' . __( 'copy', 'acf' ) . ')';
	}

	// When importing a new field group, insert a temporary post and set the field group's ID.
	// This allows fields to be updated before the field group (field group ID is needed for field parent setting).
	if ( ! $field_group['ID'] ) {
		$field_group['ID'] = wp_insert_post( array( 'post_title' => $field_group['key'] ) );
	}

	// Duplicate fields.
	$duplicates = acf_duplicate_fields( $fields, $field_group['ID'] );

	// Save field group.
	$field_group = acf_update_field_group( $field_group );

	/**
	 * Fires immediately after a field_group has been duplicated.
	 *
	 * @date    12/02/2014
	 * @since   5.0.0
	 *
	 * @param   array $field_group The field_group array.
	 */
	do_action( 'acf/duplicate_field_group', $field_group );

	// return
	return $field_group;
}

/**
 * acf_get_field_group_style
 *
 * Returns the CSS styles generated from field group settings.
 *
 * @date    20/10/13
 * @since   5.0.0
 *
 * @param   array $field_group The field group array.
 * @return  string.
 */
function acf_get_field_group_style( $field_group ) {

	// Vars.
	$style    = '';
	$elements = array(
		'permalink'       => '#edit-slug-box',
		'the_content'     => '#postdivrich',
		'excerpt'         => '#postexcerpt',
		'custom_fields'   => '#postcustom',
		'discussion'      => '#commentstatusdiv',
		'comments'        => '#commentsdiv',
		'slug'            => '#slugdiv',
		'author'          => '#authordiv',
		'format'          => '#formatdiv',
		'page_attributes' => '#pageparentdiv',
		'featured_image'  => '#postimagediv',
		'revisions'       => '#revisionsdiv',
		'categories'      => '#categorydiv',
		'tags'            => '#tagsdiv-post_tag',
		'send-trackbacks' => '#trackbacksdiv',
	);

	// Loop over field group settings and generate list of selectors to hide.
	if ( is_array( $field_group['hide_on_screen'] ) ) {
		$hide = array();
		foreach ( $field_group['hide_on_screen'] as $k ) {
			if ( isset( $elements[ $k ] ) ) {
				$id     = $elements[ $k ];
				$hide[] = $id;
				$hide[] = '#screen-meta label[for=' . substr( $id, 1 ) . '-hide]';
			}
		}
		$style = implode( ', ', $hide ) . ' {display: none;}';
	}

	/**
	 * Filters the generated CSS styles.
	 *
	 * @date    12/02/2014
	 * @since   5.0.0
	 *
	 * @param   string $style The CSS styles.
	 * @param   array $field_group The field group array.
	 */
	return apply_filters( 'acf/get_field_group_style', $style, $field_group );
}

/**
 * acf_get_field_group_edit_link
 *
 * Checks if the current user can edit the field group and returns the edit url.
 *
 * @date    23/9/18
 * @since   5.7.7
 *
 * @param   int $post_id The field group ID.
 * @return  string
 */
function acf_get_field_group_edit_link( $post_id ) {
	if ( $post_id && acf_current_user_can_admin() ) {
		return admin_url( 'post.php?post=' . $post_id . '&action=edit' );
	}
	return '';
}

/**
 * acf_prepare_field_group_for_export
 *
 * Returns a modified field group ready for export.
 *
 * @date    11/03/2014
 * @since   5.0.0
 *
 * @param   array $field_group The field group array.
 * @return  array
 */
function acf_prepare_field_group_for_export( $field_group = array() ) {

	// Remove args.
	acf_extract_vars( $field_group, array( 'ID', 'local', '_valid' ) );

	// Prepare fields.
	$field_group['fields'] = acf_prepare_fields_for_export( $field_group['fields'] );

	/**
	 * Filters the $field_group array before being returned to the export tool.
	 *
	 * @date    12/02/2014
	 * @since   5.0.0
	 *
	 * @param   array $field_group The $field group array.
	 */
	return apply_filters( 'acf/prepare_field_group_for_export', $field_group );
}

/**
 * acf_prepare_field_group_for_import
 *
 * Prepares a field group for the import process.
 *
 * @date    21/11/19
 * @since   5.8.8
 *
 * @param   array $field_group The field group array.
 * @return  array
 */
function acf_prepare_field_group_for_import( $field_group ) {

	// Update parent and menu_order properties for all fields.
	if ( $field_group['fields'] ) {
		foreach ( $field_group['fields'] as $i => &$field ) {
			$field['parent']     = $field_group['key'];
			$field['menu_order'] = $i;
		}
	}

	/**
	 * Filters the $field_group array before being returned to the import tool.
	 *
	 * @date    21/11/19
	 * @since   5.8.8
	 *
	 * @param   array $field_group The field group array.
	 */
	return apply_filters( 'acf/prepare_field_group_for_import', $field_group );
}

/**
 * acf_import_field_group
 *
 * Imports a field group into the databse.
 *
 * @date    11/03/2014
 * @since   5.0.0
 *
 * @param   array $field_group The field group array.
 * @return  array The new field group.
 */
function acf_import_field_group( $field_group ) {

	// Disable filters to ensure data is not modified by local, clone, etc.
	$filters = acf_disable_filters();

	// Validate field group (ensures all settings exist).
	$field_group = acf_get_valid_field_group( $field_group );

	// Prepare group for import (modifies settings).
	$field_group = acf_prepare_field_group_for_import( $field_group );

	// Prepare fields for import (modifies settings).
	$fields = acf_prepare_fields_for_import( $field_group['fields'] );

	// Stores a map of field "key" => "ID".
	$ids = array();

	// If the field group has an ID, review and delete stale fields in the database.
	if ( $field_group['ID'] ) {

		// Load database fields.
		$db_fields = acf_prepare_fields_for_import( acf_get_fields( $field_group ) );

		// Generate map of "index" => "key" data.
		$keys = wp_list_pluck( $fields, 'key' );

		// Loop over db fields and delete those who don't exist in $new_fields.
		foreach ( $db_fields as $field ) {

			// Add field data to $ids map.
			$ids[ $field['key'] ] = $field['ID'];

			// Delete field if not in $keys.
			if ( ! in_array( $field['key'], $keys ) ) {
				acf_delete_field( $field['ID'] );
			}
		}
	}

	// When importing a new field group, insert a temporary post and set the field group's ID.
	// This allows fields to be updated before the field group (field group ID is needed for field parent setting).
	if ( ! $field_group['ID'] ) {
		$field_group['ID'] = wp_insert_post( array( 'post_title' => $field_group['key'] ) );
	}

	// Add field group data to $ids map.
	$ids[ $field_group['key'] ] = $field_group['ID'];

	// Loop over and add fields.
	if ( $fields ) {
		foreach ( $fields as $field ) {

			// Replace any "key" references with "ID".
			if ( isset( $ids[ $field['key'] ] ) ) {
				$field['ID'] = $ids[ $field['key'] ];
			}
			if ( isset( $ids[ $field['parent'] ] ) ) {
				$field['parent'] = $ids[ $field['parent'] ];
			}

			// Save field.
			$field = acf_update_field( $field );

			// Add field data to $ids map for children.
			$ids[ $field['key'] ] = $field['ID'];
		}
	}

	// Save field group.
	$field_group = acf_update_field_group( $field_group );

	// Enable filters again.
	acf_enable_filters( $filters );

	/**
	 * Fires immediately after a field_group has been imported.
	 *
	 * @date    12/02/2014
	 * @since   5.0.0
	 *
	 * @param   array $field_group The field_group array.
	 */
	do_action( 'acf/import_field_group', $field_group );

	// return new field group.
	return $field_group;
}