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							<?php

/**
 *  acf_has_upgrade
 *
 *  Returns true if this site has an upgrade avaialble.
 *
 *  @date    24/8/18
 *  @since   5.7.4
 *
 *  @param   void
 *  @return  bool
 */
function acf_has_upgrade() {

	// vars
	$db_version = acf_get_db_version();

	// return true if DB version is < latest upgrade version
	if ( $db_version && acf_version_compare( $db_version, '<', '5.5.0' ) ) {
		return true;
	}

	// update DB version if needed
	if ( $db_version !== ACF_VERSION ) {
		acf_update_db_version( ACF_VERSION );
	}

	// return
	return false;
}

/**
 *  acf_upgrade_all
 *
 *  Returns true if this site has an upgrade avaialble.
 *
 *  @date    24/8/18
 *  @since   5.7.4
 *
 *  @param   void
 *  @return  bool
 */
function acf_upgrade_all() {

	// increase time limit
	@set_time_limit( 600 );

	// start timer
	timer_start();

	// log
	acf_dev_log( 'ACF Upgrade Begin.' );

	// vars
	$db_version = acf_get_db_version();

	// 5.0.0
	if ( acf_version_compare( $db_version, '<', '5.0.0' ) ) {
		acf_upgrade_500();
	}

	// 5.5.0
	if ( acf_version_compare( $db_version, '<', '5.5.0' ) ) {
		acf_upgrade_550();
	}

	// upgrade DB version once all updates are complete
	acf_update_db_version( ACF_VERSION );

	// log
	global $wpdb;
	acf_dev_log( 'ACF Upgrade Complete.', $wpdb->num_queries, timer_stop( 0 ) );
}

/**
 *  acf_get_db_version
 *
 *  Returns the ACF DB version.
 *
 *  @date    10/09/2016
 *  @since   5.4.0
 *
 *  @param   void
 *  @return  string
 */
function acf_get_db_version() {
	return get_option( 'acf_version' );
}

/*
*  acf_update_db_version
*
*  Updates the ACF DB version.
*
*  @date    10/09/2016
*  @since   5.4.0
*
*  @param   string $version The new version.
*  @return  void
*/
function acf_update_db_version( $version = '' ) {
	update_option( 'acf_version', $version );
}

/**
 *  acf_upgrade_500
 *
 *  Version 5 introduces new post types for field groups and fields.
 *
 *  @date    23/8/18
 *  @since   5.7.4
 *
 *  @param   void
 *  @return  void
 */
function acf_upgrade_500() {

	// log
	acf_dev_log( 'ACF Upgrade 5.0.0.' );

	// action
	do_action( 'acf/upgrade_500' );

	// do tasks
	acf_upgrade_500_field_groups();

	// update version
	acf_update_db_version( '5.0.0' );
}

/**
 *  acf_upgrade_500_field_groups
 *
 *  Upgrades all ACF4 field groups to ACF5
 *
 *  @date    23/8/18
 *  @since   5.7.4
 *
 *  @param   void
 *  @return  void
 */
function acf_upgrade_500_field_groups() {

	// log
	acf_dev_log( 'ACF Upgrade 5.0.0 Field Groups.' );

	// get old field groups
	$ofgs = get_posts(
		array(
			'numberposts'      => -1,
			'post_type'        => 'acf',
			'orderby'          => 'menu_order title',
			'order'            => 'asc',
			'suppress_filters' => true,
		)
	);

	// loop
	if ( $ofgs ) {
		foreach ( $ofgs as $ofg ) {
			acf_upgrade_500_field_group( $ofg );
		}
	}
}

/**
 *  acf_upgrade_500_field_group
 *
 *  Upgrades a ACF4 field group to ACF5
 *
 *  @date    23/8/18
 *  @since   5.7.4
 *
 *  @param   object $ofg The old field group post object.
 *  @return  array $nfg  The new field group array.
 */
function acf_upgrade_500_field_group( $ofg ) {

	// log
	acf_dev_log( 'ACF Upgrade 5.0.0 Field Group.', $ofg );

	// vars
	$nfg = array(
		'ID'         => 0,
		'title'      => $ofg->post_title,
		'menu_order' => $ofg->menu_order,
	);

	// construct the location rules
	$rules    = get_post_meta( $ofg->ID, 'rule', false );
	$anyorall = get_post_meta( $ofg->ID, 'allorany', true );
	if ( is_array( $rules ) ) {

		// if field group was duplicated, rules may be a serialized string!
		$rules = array_map( 'maybe_unserialize', $rules );

		// convert rules to groups
		$nfg['location'] = acf_convert_rules_to_groups( $rules, $anyorall );
	}

	// settings
	if ( $position = get_post_meta( $ofg->ID, 'position', true ) ) {
		$nfg['position'] = $position;
	}

	if ( $layout = get_post_meta( $ofg->ID, 'layout', true ) ) {
		$nfg['layout'] = $layout;
	}

	if ( $hide_on_screen = get_post_meta( $ofg->ID, 'hide_on_screen', true ) ) {
		$nfg['hide_on_screen'] = maybe_unserialize( $hide_on_screen );
	}

	// save field group
	// acf_upgrade_field_group will call the acf_get_valid_field_group function and apply 'compatibility' changes
	$nfg = acf_update_field_group( $nfg );

	// log
	acf_dev_log( '> Complete.', $nfg );

	// action for 3rd party
	do_action( 'acf/upgrade_500_field_group', $nfg, $ofg );

	// upgrade fields
	acf_upgrade_500_fields( $ofg, $nfg );

	// trash?
	if ( $ofg->post_status == 'trash' ) {
		acf_trash_field_group( $nfg['ID'] );
	}

	// return
	return $nfg;
}

/**
 *  acf_upgrade_500_fields
 *
 *  Upgrades all ACF4 fields to ACF5 from a specific field group
 *
 *  @date    23/8/18
 *  @since   5.7.4
 *
 *  @param   object $ofg The old field group post object.
 *  @param   array  $nfg  The new field group array.
 *  @return  void
 */
function acf_upgrade_500_fields( $ofg, $nfg ) {

	// log
	acf_dev_log( 'ACF Upgrade 5.0.0 Fields.' );

	// global
	global $wpdb;

	// get field from postmeta
	$rows = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->postmeta WHERE post_id = %d AND meta_key LIKE %s", $ofg->ID, 'field_%' ), ARRAY_A );

	// check
	if ( $rows ) {

		// vars
		$checked = array();

		// loop
		foreach ( $rows as $row ) {

			// vars
			$field = $row['meta_value'];
			$field = maybe_unserialize( $field );
			$field = maybe_unserialize( $field ); // run again for WPML

			// bail early if key already migrated (potential duplicates in DB)
			if ( isset( $checked[ $field['key'] ] ) ) {
				continue;
			}
			$checked[ $field['key'] ] = 1;

			// add parent
			$field['parent'] = $nfg['ID'];

			// migrate field
			$field = acf_upgrade_500_field( $field );
		}
	}
}

/**
 *  acf_upgrade_500_field
 *
 *  Upgrades a ACF4 field to ACF5
 *
 *  @date    23/8/18
 *  @since   5.7.4
 *
 *  @param   array $field The old field.
 *  @return  array $field The new field.
 */
function acf_upgrade_500_field( $field ) {

	// log
	acf_dev_log( 'ACF Upgrade 5.0.0 Field.', $field );

	// order_no is now menu_order
	$field['menu_order'] = acf_extract_var( $field, 'order_no', 0 );

	// correct very old field keys (field2 => field_2)
	if ( substr( $field['key'], 0, 6 ) !== 'field_' ) {
		$field['key'] = 'field_' . str_replace( 'field', '', $field['key'] );
	}

	// extract sub fields
	$sub_fields = array();
	if ( $field['type'] == 'repeater' ) {

		// loop over sub fields
		if ( ! empty( $field['sub_fields'] ) ) {
			foreach ( $field['sub_fields'] as $sub_field ) {
				$sub_fields[] = $sub_field;
			}
		}

		// remove sub fields from field
		unset( $field['sub_fields'] );

	} elseif ( $field['type'] == 'flexible_content' ) {

		// loop over layouts
		if ( is_array( $field['layouts'] ) ) {
			foreach ( $field['layouts'] as $i => $layout ) {

				// generate key
				$layout['key'] = uniqid( 'layout_' );

				// loop over sub fields
				if ( ! empty( $layout['sub_fields'] ) ) {
					foreach ( $layout['sub_fields'] as $sub_field ) {
						$sub_field['parent_layout'] = $layout['key'];
						$sub_fields[]               = $sub_field;
					}
				}

				// remove sub fields from layout
				unset( $layout['sub_fields'] );

				// update
				$field['layouts'][ $i ] = $layout;

			}
		}
	}

	// save field
	$field = acf_update_field( $field );

	// log
	acf_dev_log( '> Complete.', $field );

	// sub fields
	if ( $sub_fields ) {
		foreach ( $sub_fields as $sub_field ) {
			$sub_field['parent'] = $field['ID'];
			acf_upgrade_500_field( $sub_field );
		}
	}

	// action for 3rd party
	do_action( 'acf/update_500_field', $field );

	// return
	return $field;
}

/**
 *  acf_upgrade_550
 *
 *  Version 5.5 adds support for the wp_termmeta table added in WP 4.4.
 *
 *  @date    23/8/18
 *  @since   5.7.4
 *
 *  @param   void
 *  @return  void
 */
function acf_upgrade_550() {

	// log
	acf_dev_log( 'ACF Upgrade 5.5.0.' );

	// action
	do_action( 'acf/upgrade_550' );

	// do tasks
	acf_upgrade_550_termmeta();

	// update version
	acf_update_db_version( '5.5.0' );
}

/**
 *  acf_upgrade_550_termmeta
 *
 *  Upgrades all ACF4 termmeta saved in wp_options to the wp_termmeta table.
 *
 *  @date    23/8/18
 *  @since   5.7.4
 *
 *  @param   void
 *  @return  void
 */
function acf_upgrade_550_termmeta() {

	// log
	acf_dev_log( 'ACF Upgrade 5.5.0 Termmeta.' );

	// bail early if no wp_termmeta table
	if ( get_option( 'db_version' ) < 34370 ) {
		return;
	}

	// get all taxonomies
	$taxonomies = get_taxonomies( false, 'objects' );

	// loop
	if ( $taxonomies ) {
		foreach ( $taxonomies as $taxonomy ) {
			acf_upgrade_550_taxonomy( $taxonomy->name );
		}
	}

	// action for 3rd party
	do_action( 'acf/upgrade_550_termmeta' );
}

/*
*  acf_wp_upgrade_550_termmeta
*
*  When the database is updated to support term meta, migrate ACF term meta data across.
*
*  @date    23/8/18
*  @since   5.7.4
*
*  @param   string $wp_db_version The new $wp_db_version.
*  @param   string $wp_current_db_version The old (current) $wp_db_version.
*  @return  void
*/
function acf_wp_upgrade_550_termmeta( $wp_db_version, $wp_current_db_version ) {
	if ( $wp_db_version >= 34370 && $wp_current_db_version < 34370 ) {
		if ( acf_version_compare( acf_get_db_version(), '>', '5.5.0' ) ) {
			acf_upgrade_550_termmeta();
		}
	}
}
add_action( 'wp_upgrade', 'acf_wp_upgrade_550_termmeta', 10, 2 );

/**
 *  acf_upgrade_550_taxonomy
 *
 *  Upgrades all ACF4 termmeta for a specific taxonomy.
 *
 *  @date    24/8/18
 *  @since   5.7.4
 *
 *  @param   string $taxonomy The taxonomy name.
 *  @return  void
 */
function acf_upgrade_550_taxonomy( $taxonomy ) {

	// log
	acf_dev_log( 'ACF Upgrade 5.5.0 Taxonomy.', $taxonomy );

	// global
	global $wpdb;

	// vars
	$search  = $taxonomy . '_%';
	$_search = '_' . $search;

	// escape '_'
	// http://stackoverflow.com/questions/2300285/how-do-i-escape-in-sql-server
	$search  = str_replace( '_', '\_', $search );
	$_search = str_replace( '_', '\_', $_search );

	// search
	// results show faster query times using 2 LIKE vs 2 wildcards
	$rows = $wpdb->get_results(
		$wpdb->prepare(
			"SELECT * 
		FROM $wpdb->options 
		WHERE option_name LIKE %s 
		OR option_name LIKE %s",
			$search,
			$_search
		),
		ARRAY_A
	);

	// loop
	if ( $rows ) {
		foreach ( $rows as $row ) {

			/*
			Use regex to find "(_)taxonomy_(term_id)_(field_name)" and populate $matches:
			Array
			(
			[0] => _category_3_color
			[1] => _
			[2] => 3
			[3] => color
			)
			*/
			if ( ! preg_match( "/^(_?){$taxonomy}_(\d+)_(.+)/", $row['option_name'], $matches ) ) {
				continue;
			}

			// vars
			$term_id    = $matches[2];
			$meta_key   = $matches[1] . $matches[3];
			$meta_value = $row['option_value'];

			// update
			// memory usage reduced by 50% by using a manual insert vs update_metadata() function.
			// update_metadata( 'term', $term_id, $meta_name, $meta_value );
			$wpdb->insert(
				$wpdb->termmeta,
				array(
					'term_id'    => $term_id,
					'meta_key'   => $meta_key,
					'meta_value' => $meta_value,
				)
			);

			// log
			acf_dev_log( 'ACF Upgrade 5.5.0 Term.', $term_id, $meta_key );

			// action
			do_action( 'acf/upgrade_550_taxonomy_term', $term_id );
		}
	}

	// action for 3rd party
	do_action( 'acf/upgrade_550_taxonomy', $taxonomy );
}