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Filename : PodsTermSplitting.php
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<?php

// Don't load directly.
if ( ! defined( 'ABSPATH' ) ) {
	die( '-1' );
}

/**
 * @package Pods
 */
class Pods_Term_Splitting {

	/** @var int ID of the formerly shared term */
	private $term_id;

	/** @var int ID of the new term created for the $term_taxonomy_id */
	private $new_term_id;

	/** @var string Taxonomy for the split term */
	private $taxonomy;

	/** @var string */
	private $progress_option_name;

	/** @var array */
	private $previous_progress = [];

	/**
	 * @param int    $term_id     ID of the formerly shared term.
	 * @param int    $new_term_id ID of the new term created for the $term_taxonomy_id.
	 * @param string $taxonomy    Taxonomy for the split term.
	 */
	public function __construct( $term_id, $new_term_id, $taxonomy ) {
		$this->term_id     = $term_id;
		$this->new_term_id = $new_term_id;
		$this->taxonomy    = $taxonomy;

		$this->progress_option_name = "_pods_term_split_{$term_id}_{$taxonomy}";
	}

	/**
	 *
	 */
	public function split_shared_term() {
		// Stash any previous progress
		$this->previous_progress = $this->get_progress();

		if ( empty( $this->previous_progress ) ) {
			$this->append_progress( 'started' );
			$this->append_progress( "new term ID: {$this->new_term_id}" );
		}

		// Get the Pod information if the taxonomy is a Pod
		$taxonomy_pod = $this->get_pod_info();

		// Is the taxonomy a Pod?
		if ( is_array( $taxonomy_pod ) || $taxonomy_pod instanceof Pods\Whatsit ) {
			$this->update_podsrel_taxonomy( $taxonomy_pod['id'] );

			// Update the Pods table if the taxonomy is a table based Pod
			if ( 'table' === $taxonomy_pod['storage'] ) {
				$this->update_pod_table( $taxonomy_pod['pod_table'] );
			}
		}

		// Track down all fields related to the target taxonomy and update stored term IDs as necessary
		$this->update_relationships_to_term();

		// Clean up
		$this->delete_progress();
	}

	/**
	 * Return the Pod information for the specified taxonomy, or null if the taxonomy isn't a Pod
	 *
	 * @return array|bool|mixed|null
	 */
	private function get_pod_info() {
		$pod_info = null;

		try {
			$api = pods_api();

			if ( $api->pod_exists( [ 'name' => $this->taxonomy ] ) ) {
				// Load the taxonomy Pod
				$params = [
					'name' => $this->taxonomy,
				];

				$pod_info = $api->load_pod( $params, false );
			}
		} catch ( Exception $exception ) {
			pods_debug_log( $exception );
		}

		return $pod_info;
	}

	/**
	 * @param int $pod_id
	 */
	private function update_podsrel_taxonomy( $pod_id ) {
		/** @var wpdb $wpdb */
		global $wpdb;

		$task = "update_podsrel_taxonomy_{$pod_id}";

		if ( ! $this->have_done( $task ) ) {
			if ( pods_podsrel_enabled( null, __METHOD__ ) ) {
				// UPDATE {$wpdb->prefix}podsrel SET item_id = {$new_term_id} WHERE pod_id = {$pod_id} AND item_id = {$term_id}
				$table = "{$wpdb->prefix}podsrel";

				$data = [
					'item_id' => $this->new_term_id,
				];

				$where = [
					'pod_id'  => $pod_id,
					'item_id' => $this->term_id,
				];

				$format       = '%d';
				$where_format = '%d';

				$wpdb->update( $table, $data, $where, $format, $where_format );
			}

			/**
			 * Allow hooking into the term splitting process for taxonomy.
			 *
			 * @since 2.8.0
			 *
			 * @param int    $pod_id      The pod ID for the taxonomy.
			 * @param int    $term_id     The current term ID being split.
			 * @param int    $new_term_id The new term ID.
			 * @param string $task        The task being done.
			 */
			do_action( 'pods_term_splitting_update_taxonomy', $pod_id, $this->term_id, $this->new_term_id, $task );

			$this->append_progress( $task );
		}
	}

	/**
	 * @param string $pod_table
	 */
	private function update_pod_table( $pod_table ) {
		/** @var wpdb $wpdb */
		global $wpdb;

		$task = "update_pod_table_{$pod_table}";

		if ( ! $this->have_done( $task ) ) {
			// Prime the values and update
			$data = [
				'id' => $this->new_term_id,
			];

			$where = [
				'id' => $this->term_id,
			];

			$format       = '%d';
			$where_format = '%d';

			$wpdb->update( $pod_table, $data, $where, $format, $where_format );

			$this->append_progress( $task );
		}
	}

	/**
	 * Track down all fields related to the target taxonomy and update stored term IDs as necessary
	 */
	private function update_relationships_to_term() {
		// Loop through all Pods
		try {
			$all_pods = pods_api()->load_pods();
		} catch ( Exception $exception ) {
			pods_debug_log( $exception );

			return;
		}

		if ( ! is_array( $all_pods ) ) {
			return;
		}

		foreach ( $all_pods as $this_pod_id => $this_pod ) {
			// Loop through all fields in this Pod
			foreach ( $this_pod['fields'] as $this_field_name => $this_field ) {
				// Ignore everything except relationship fields to this taxonomy
				if ( 'pick' !== $this_field['type'] || 'taxonomy' !== $this_field['pick_object'] || $this->taxonomy !== $this_field['pick_val'] ) {
					continue;
				}

				// Update the term ID in podsrel everywhere it is the value for this field
				$this->update_podsrel_related_term( $this_field['id'] );

				// Fix-up any special-case relationships that store term IDs in their own meta table and/or serialized
				switch ( $this_pod['type'] ) {
					case 'post_type':
						$this->update_postmeta( $this_pod['name'], $this_field_name );
						break;

					case 'comment':
						$this->update_commentmeta( $this_field_name );
						break;

					case 'user':
						$this->update_usermeta( $this_field_name );
						break;

					case 'settings':
						$this->update_setting_meta( $this_pod['name'], $this_field_name );
						break;
				}
			}//end foreach
		}//end foreach

	}

	/**
	 * @param int $field_id
	 */
	private function update_podsrel_related_term( $field_id ) {
		/** @var wpdb $wpdb */
		global $wpdb;

		$task = "update_podsrel_related_term_{$field_id}";

		if ( ! $this->have_done( $task ) ) {
			if ( pods_podsrel_enabled( null, __METHOD__ ) ) {
				// UPDATE {$wpdb->prefix}podsrel SET related_item_id = {$new_term_id} WHERE field_id = {$field_id} AND related_item_id = {$term_id}
				$table = "{$wpdb->prefix}podsrel";

				$data = [
					'related_item_id' => $this->new_term_id,
				];

				$where = [
					'field_id'        => $field_id,
					'related_item_id' => $this->term_id,
				];

				$format       = '%d';
				$where_format = '%d';

				$wpdb->update( $table, $data, $where, $format, $where_format );
			}

			/**
			 * Allow hooking into the term splitting process for taxonomy by related term.
			 *
			 * @since 2.8.0
			 *
			 * @param int    $field_id    The field ID for the relationship.
			 * @param int    $term_id     The current term ID being split.
			 * @param int    $new_term_id The new term ID.
			 * @param string $task        The task being done.
			 */
			do_action( 'pods_term_splitting_update_related_term', $field_id, $this->term_id, $this->new_term_id, $task );

			$this->append_progress( $task );
		}
	}

	/**
	 * Called for all fields related to the target taxonomy that are in a post_type
	 *
	 * @param string $pod_name
	 * @param string $field_name
	 */
	private function update_postmeta( $pod_name, $field_name ) {
		/** @var wpdb $wpdb */
		global $wpdb;

		// Fix up the unserialized data
		$task = "update_postmeta_{$pod_name}_{$field_name}_unserialized";
		if ( ! $this->have_done( $task ) ) {
			$wpdb->query( $wpdb->prepare( "
				UPDATE
					{$wpdb->postmeta} AS meta
					LEFT JOIN {$wpdb->posts} AS t
					ON meta.post_id = t.ID
				SET
					meta_value = %s
				WHERE
					meta_key = %s
					AND meta_value = %s
					AND t.post_type = %s
				", $this->new_term_id, $field_name, $this->term_id, $pod_name ) );

			$this->append_progress( $task );
		}//end if

		// Fix up the serialized data
		$task = "update_postmeta_{$pod_name}_{$field_name}_serialized";
		if ( ! $this->have_done( $task ) ) {
			$meta_key           = sprintf( '_pods_%s', $field_name );
			$target_serialized  = sprintf( ';i:%s;', $this->term_id );
			$replace_serialized = sprintf( ';i:%s;', $this->new_term_id );

			$wpdb->query( $wpdb->prepare( "
				UPDATE
				    {$wpdb->postmeta} AS meta
			    LEFT JOIN {$wpdb->posts} AS t
					ON meta.post_id = t.ID
				SET
					meta.meta_value = REPLACE( meta.meta_value, %s, %s )
				WHERE
				    meta.meta_key = %s
					AND t.post_type = %s
					AND meta_value LIKE %s
				", $target_serialized, $replace_serialized, $meta_key, $pod_name, '%' . pods_sanitize_like( $target_serialized ) . '%' ) );

			$this->append_progress( $task );
		}//end if

	}

	/**
	 * Called for all fields related to the target taxonomy that are in a comment Pod
	 *
	 * @param string $field_name
	 */
	private function update_commentmeta( $field_name ) {
		/** @var wpdb $wpdb */
		global $wpdb;

		// Fix up the unserialized data
		$task = "update_commentmeta_{$field_name}_unserialized";
		if ( ! $this->have_done( $task ) ) {
			$table        = $wpdb->commentmeta;
			$data         = [ 'meta_value' => $this->new_term_id ]; // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_value
			$where        = [
				'meta_key'   => $field_name, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key
				'meta_value' => $this->term_id, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_value
			];
			$format       = '%s';
			$where_format = [ '%s', '%s' ];
			$wpdb->update( $table, $data, $where, $format, $where_format );

			$this->append_progress( $task );
		}

		// Fix up the serialized data
		$task = "update_commentmeta_{$field_name}_serialized";
		if ( ! $this->have_done( $task ) ) {
			$meta_key           = sprintf( '_pods_%s', $field_name );
			$target_serialized  = sprintf( ';i:%s;', $this->term_id );
			$replace_serialized = sprintf( ';i:%s;', $this->new_term_id );

			$wpdb->query( $wpdb->prepare( "
				UPDATE
				    {$wpdb->commentmeta}
				SET
					meta_value = REPLACE( meta_value, %s, %s )
				WHERE
				    meta_key = %s
					AND meta_value LIKE %s
				", $target_serialized, $replace_serialized, $meta_key, '%' . pods_sanitize_like( $target_serialized ) . '%' ) );

			$this->append_progress( $task );
		}//end if

	}

	/**
	 * Called for all fields related to the target taxonomy that are in a user Pod
	 *
	 * @param string $field_name
	 */
	private function update_usermeta( $field_name ) {
		/** @var wpdb $wpdb */
		global $wpdb;

		// Fix up the unserialized data
		$task = "update_usermeta_{$field_name}_unserialized";
		if ( ! $this->have_done( $task ) ) {
			$table        = $wpdb->usermeta;
			$data         = [ 'meta_value' => $this->new_term_id ]; // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_value
			$where        = [
				'meta_key'   => $field_name, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key
				'meta_value' => $this->term_id, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_value
			];
			$format       = '%s';
			$where_format = [ '%s', '%s' ];
			$wpdb->update( $table, $data, $where, $format, $where_format );

			$this->append_progress( $task );
		}

		// Fix up the serialized data
		$task = "update_usermeta_{$field_name}_serialized";
		if ( ! $this->have_done( $task ) ) {
			$meta_key           = sprintf( '_pods_%s', $field_name );
			$target_serialized  = sprintf( ';i:%s;', $this->term_id );
			$replace_serialized = sprintf( ';i:%s;', $this->new_term_id );

			$wpdb->query( $wpdb->prepare( "
				UPDATE
				    {$wpdb->usermeta}
				SET
					meta_value = REPLACE( meta_value, %s, %s )
				WHERE
				    meta_key = %s
					AND meta_value LIKE %s
				", $target_serialized, $replace_serialized, $meta_key, '%' . pods_sanitize_like( $target_serialized ) . '%' ) );

			$this->append_progress( $task );
		}//end if

	}

	/**
	 * Called for all fields related to the target taxonomy that are in a user Pod
	 *
	 * @param string $pod_name
	 * @param string $field_name
	 */
	private function update_setting_meta( $pod_name, $field_name ) {
		/** @var wpdb $wpdb */
		global $wpdb;

		$option_name = "{$pod_name}_{$field_name}";

		// Fix up the unserialized data
		$task = "update_setting_meta_{$pod_name}_{$field_name}_unserialized";
		if ( ! $this->have_done( $task ) ) {
			// UPDATE {$wpdb->options} SET option_value = '{$new_term_id}' WHERE option_name = '{$pod_name}_{$field_name}' AND option_value = '{$term_id}'
			$table        = $wpdb->options;
			$data         = [ 'option_value' => $this->new_term_id ];
			$where        = [
				'option_name'  => $option_name,
				'option_value' => $this->term_id,
			];
			$format       = '%s';
			$where_format = [ '%s', '%s' ];
			$wpdb->update( $table, $data, $where, $format, $where_format );

			$this->append_progress( $task );
		}

		// Fix up the serialized data
		$task = "update_setting_meta_{$pod_name}_{$field_name}_serialized";
		if ( ! $this->have_done( $task ) ) {
			$target_serialized  = sprintf( ';i:%s;', $this->term_id );
			$replace_serialized = sprintf( ';i:%s;', $this->new_term_id );

			$wpdb->query( $wpdb->prepare( "
				UPDATE
					{$wpdb->options}
				SET
					option_value = REPLACE( option_value, %s, %s )
				WHERE
					option_name = %s
					AND option_value LIKE %s
				", $target_serialized, $replace_serialized, $option_name, '%' . pods_sanitize_like( $target_serialized ) . '%' ) );

			$this->append_progress( $task );
		}//end if

	}

	/**
	 * @param string $task_name
	 *
	 * @return bool
	 */
	private function have_done( $task_name ) {
		return in_array( $task_name, $this->previous_progress, true );
	}

	/**
	 * @return array
	 */
	private function get_progress() {
		return get_option( $this->progress_option_name, [] );
	}

	/**
	 * @param $data
	 */
	private function append_progress( $data ) {
		// Get the current progress array
		$current_progress = $this->get_progress();
		if ( ! is_array( $current_progress ) ) {
			$current_progress = [];
		}

		// Tack on the new data
		$updated_progress = array_merge( $current_progress, [ $data ] );

		// Note: we don't want autoload set and you cannot specify autoload via update_option
		if ( ! empty( $current_progress ) && is_array( $current_progress ) ) {
			update_option( $this->progress_option_name, $updated_progress );
		} else {
			add_option( $this->progress_option_name, $updated_progress, '', false );
		}
	}

	/**
	 *
	 */
	private function delete_progress() {
		delete_option( $this->progress_option_name );
	}

}