<?php

/**
 * Class ActionScheduler_wpPostStore
 */
class ActionScheduler_wpPostStore extends ActionScheduler_Store {
	const POST_TYPE         = 'scheduled-action';
	const GROUP_TAXONOMY    = 'action-group';
	const SCHEDULE_META_KEY = '_action_manager_schedule';
	const DEPENDENCIES_MET  = 'as-post-store-dependencies-met';

	/**
	 * Used to share information about the before_date property of claims internally.
	 *
	 * This is used in preference to passing the same information as a method param
	 * for backwards-compatibility reasons.
	 *
	 * @var DateTime|null
	 */
	private $claim_before_date = null;

	/**
	 * Local Timezone.
	 *
	 * @var DateTimeZone
	 */
	protected $local_timezone = null;

	/**
	 * Save action.
	 *
	 * @param ActionScheduler_Action $action Scheduled Action.
	 * @param DateTime|null          $scheduled_date Scheduled Date.
	 *
	 * @throws RuntimeException Throws an exception if the action could not be saved.
	 * @return int
	 */
	public function save_action( ActionScheduler_Action $action, ?DateTime $scheduled_date = null ) {
		try {
			$this->validate_action( $action );
			$post_array = $this->create_post_array( $action, $scheduled_date );
			$post_id    = $this->save_post_array( $post_array );
			$this->save_post_schedule( $post_id, $action->get_schedule() );
			$this->save_action_group( $post_id, $action->get_group() );
			do_action( 'action_scheduler_stored_action', $post_id );
			return $post_id;
		} catch ( Exception $e ) {
			/* translators: %s: action error message */
			throw new RuntimeException( sprintf( __( 'Error saving action: %s', 'action-scheduler' ), $e->getMessage() ), 0 );
		}
	}

	/**
	 * Create post array.
	 *
	 * @param ActionScheduler_Action $action Scheduled Action.
	 * @param DateTime|null          $scheduled_date Scheduled Date.
	 *
	 * @return array Returns an array of post data.
	 */
	protected function create_post_array( ActionScheduler_Action $action, ?DateTime $scheduled_date = null ) {
		$post = array(
			'post_type'     => self::POST_TYPE,
			'post_title'    => $action->get_hook(),
			'post_content'  => wp_json_encode( $action->get_args() ),
			'post_status'   => ( $action->is_finished() ? 'publish' : 'pending' ),
			'post_date_gmt' => $this->get_scheduled_date_string( $action, $scheduled_date ),
			'post_date'     => $this->get_scheduled_date_string_local( $action, $scheduled_date ),
		);
		return $post;
	}

	/**
	 * Save post array.
	 *
	 * @param array $post_array Post array.
	 * @return int Returns the post ID.
	 * @throws RuntimeException Throws an exception if the action could not be saved.
	 */
	protected function save_post_array( $post_array ) {
		add_filter( 'wp_insert_post_data', array( $this, 'filter_insert_post_data' ), 10, 1 );
		add_filter( 'pre_wp_unique_post_slug', array( $this, 'set_unique_post_slug' ), 10, 5 );

		$has_kses = false !== has_filter( 'content_save_pre', 'wp_filter_post_kses' );

		if ( $has_kses ) {
			// Prevent KSES from corrupting JSON in post_content.
			kses_remove_filters();
		}

		$post_id = wp_insert_post( $post_array );

		if ( $has_kses ) {
			kses_init_filters();
		}

		remove_filter( 'wp_insert_post_data', array( $this, 'filter_insert_post_data' ), 10 );
		remove_filter( 'pre_wp_unique_post_slug', array( $this, 'set_unique_post_slug' ), 10 );

		if ( is_wp_error( $post_id ) || empty( $post_id ) ) {
			throw new RuntimeException( __( 'Unable to save action.', 'action-scheduler' ) );
		}
		return $post_id;
	}

	/**
	 * Filter insert post data.
	 *
	 * @param array $postdata Post data to filter.
	 *
	 * @return array
	 */
	public function filter_insert_post_data( $postdata ) {
		if ( self::POST_TYPE === $postdata['post_type'] ) {
			$postdata['post_author'] = 0;
			if ( 'future' === $postdata['post_status'] ) {
				$postdata['post_status'] = 'publish';
			}
		}
		return $postdata;
	}

	/**
	 * Create a (probably unique) post name for scheduled actions in a more performant manner than wp_unique_post_slug().
	 *
	 * When an action's post status is transitioned to something other than 'draft', 'pending' or 'auto-draft, like 'publish'
	 * or 'failed' or 'trash', WordPress will find a unique slug (stored in post_name column) using the wp_unique_post_slug()
	 * function. This is done to ensure URL uniqueness. The approach taken by wp_unique_post_slug() is to iterate over existing
	 * post_name values that match, and append a number 1 greater than the largest. This makes sense when manually creating a
	 * post from the Edit Post screen. It becomes a bottleneck when automatically processing thousands of actions, with a
	 * database containing thousands of related post_name values.
	 *
	 * WordPress 5.1 introduces the 'pre_wp_unique_post_slug' filter for plugins to address this issue.
	 *
	 * We can short-circuit WordPress's wp_unique_post_slug() approach using the 'pre_wp_unique_post_slug' filter. This
	 * method is available to be used as a callback on that filter. It provides a more scalable approach to generating a
	 * post_name/slug that is probably unique. Because Action Scheduler never actually uses the post_name field, or an
	 * action's slug, being probably unique is good enough.
	 *
	 * For more backstory on this issue, see:
	 * - https://github.com/woocommerce/action-scheduler/issues/44 and
	 * - https://core.trac.wordpress.org/ticket/21112
	 *
	 * @param string $override_slug Short-circuit return value.
	 * @param string $slug          The desired slug (post_name).
	 * @param int    $post_ID       Post ID.
	 * @param string $post_status   The post status.
	 * @param string $post_type     Post type.
	 * @return string
	 */
	public function set_unique_post_slug( $override_slug, $slug, $post_ID, $post_status, $post_type ) {
		if ( self::POST_TYPE === $post_type ) {
			$override_slug = uniqid( self::POST_TYPE . '-', true ) . '-' . wp_generate_password( 32, false );
		}
		return $override_slug;
	}

	/**
	 * Save post schedule.
	 *
	 * @param int    $post_id  Post ID of the scheduled action.
	 * @param string $schedule Schedule to save.
	 *
	 * @return void
	 */
	protected function save_post_schedule( $post_id, $schedule ) {
		update_post_meta( $post_id, self::SCHEDULE_META_KEY, $schedule );
	}

	/**
	 * Save action group.
	 *
	 * @param int    $post_id Post ID.
	 * @param string $group   Group to save.
	 * @return void
	 */
	protected function save_action_group( $post_id, $group ) {
		if ( empty( $group ) ) {
			wp_set_object_terms( $post_id, array(), self::GROUP_TAXONOMY, false );
		} else {
			wp_set_object_terms( $post_id, array( $group ), self::GROUP_TAXONOMY, false );
		}
	}

	/**
	 * Fetch actions.
	 *
	 * @param int $action_id Action ID.
	 * @return object
	 */
	public function fetch_action( $action_id ) {
		$post = $this->get_post( $action_id );
		if ( empty( $post ) || self::POST_TYPE !== $post->post_type ) {
			return $this->get_null_action();
		}

		try {
			$action = $this->make_action_from_post( $post );
		} catch ( ActionScheduler_InvalidActionException $exception ) {
			do_action( 'action_scheduler_failed_fetch_action', $post->ID, $exception );
			return $this->get_null_action();
		}

		return $action;
	}

	/**
	 * Get post.
	 *
	 * @param string $action_id - Action ID.
	 * @return WP_Post|null
	 */
	protected function get_post( $action_id ) {
		if ( empty( $action_id ) ) {
			return null;
		}
		return get_post( $action_id );
	}

	/**
	 * Get NULL action.
	 *
	 * @return ActionScheduler_NullAction
	 */
	protected function get_null_action() {
		return new ActionScheduler_NullAction();
	}

	/**
	 * Make action from post.
	 *
	 * @param WP_Post $post Post object.
	 * @return WP_Post
	 */
	protected function make_action_from_post( $post ) {
		$hook = $post->post_title;

		$args = json_decode( $post->post_content, true );
		$this->validate_args( $args, $post->ID );

		$schedule = get_post_meta( $post->ID, self::SCHEDULE_META_KEY, true );
		$this->validate_schedule( $schedule, $post->ID );

		$group = wp_get_object_terms( $post->ID, self::GROUP_TAXONOMY, array( 'fields' => 'names' ) );
		$group = empty( $group ) ? '' : reset( $group );

		return ActionScheduler::factory()->get_stored_action( $this->get_action_status_by_post_status( $post->post_status ), $hook, $args, $schedule, $group );
	}

	/**
	 * Get action status by post status.
	 *
	 * @param string $post_status Post status.
	 *
	 * @throws InvalidArgumentException Throw InvalidArgumentException if $post_status not in known status fields returned by $this->get_status_labels().
	 * @return string
	 */
	protected function get_action_status_by_post_status( $post_status ) {

		switch ( $post_status ) {
			case 'publish':
				$action_status = self::STATUS_COMPLETE;
				break;
			case 'trash':
				$action_status = self::STATUS_CANCELED;
				break;
			default:
				if ( ! array_key_exists( $post_status, $this->get_status_labels() ) ) {
					throw new InvalidArgumentException( sprintf( 'Invalid post status: "%s". No matching action status available.', $post_status ) );
				}
				$action_status = $post_status;
				break;
		}

		return $action_status;
	}

	/**
	 * Get post status by action status.
	 *
	 * @param string $action_status Action status.
	 *
	 * @throws InvalidArgumentException Throws InvalidArgumentException if $post_status not in known status fields returned by $this->get_status_labels().
	 * @return string
	 */
	protected function get_post_status_by_action_status( $action_status ) {

		switch ( $action_status ) {
			case self::STATUS_COMPLETE:
				$post_status = 'publish';
				break;
			case self::STATUS_CANCELED:
				$post_status = 'trash';
				break;
			default:
				if ( ! array_key_exists( $action_status, $this->get_status_labels() ) ) {
					throw new InvalidArgumentException( sprintf( 'Invalid action status: "%s".', $action_status ) );
				}
				$post_status = $action_status;
				break;
		}

		return $post_status;
	}

	/**
	 * Returns the SQL statement to query (or count) actions.
	 *
	 * @param array  $query            - Filtering options.
	 * @param string $select_or_count  - Whether the SQL should select and return the IDs or just the row count.
	 *
	 * @throws InvalidArgumentException - Throw InvalidArgumentException if $select_or_count not count or select.
	 * @return string SQL statement. The returned SQL is already properly escaped.
	 */
	protected function get_query_actions_sql( array $query, $select_or_count = 'select' ) {

		if ( ! in_array( $select_or_count, array( 'select', 'count' ), true ) ) {
			throw new InvalidArgumentException( __( 'Invalid schedule. Cannot save action.', 'action-scheduler' ) );
		}

		$query = wp_parse_args(
			$query,
			array(
				'hook'             => '',
				'args'             => null,
				'date'             => null,
				'date_compare'     => '<=',
				'modified'         => null,
				'modified_compare' => '<=',
				'group'            => '',
				'status'           => '',
				'claimed'          => null,
				'per_page'         => 5,
				'offset'           => 0,
				'orderby'          => 'date',
				'order'            => 'ASC',
				'search'           => '',
			)
		);

		/**
		 * Global wpdb object.
		 *
		 * @var wpdb $wpdb
		 */
		global $wpdb;
		$sql        = ( 'count' === $select_or_count ) ? 'SELECT count(p.ID)' : 'SELECT p.ID ';
		$sql       .= "FROM {$wpdb->posts} p";
		$sql_params = array();
		if ( empty( $query['group'] ) && 'group' === $query['orderby'] ) {
			$sql .= " LEFT JOIN {$wpdb->term_relationships} tr ON tr.object_id=p.ID";
			$sql .= " LEFT JOIN {$wpdb->term_taxonomy} tt ON tr.term_taxonomy_id=tt.term_taxonomy_id";
			$sql .= " LEFT JOIN {$wpdb->terms} t ON tt.term_id=t.term_id";
		} elseif ( ! empty( $query['group'] ) ) {
			$sql         .= " INNER JOIN {$wpdb->term_relationships} tr ON tr.object_id=p.ID";
			$sql         .= " INNER JOIN {$wpdb->term_taxonomy} tt ON tr.term_taxonomy_id=tt.term_taxonomy_id";
			$sql         .= " INNER JOIN {$wpdb->terms} t ON tt.term_id=t.term_id";
			$sql         .= ' AND t.slug=%s';
			$sql_params[] = $query['group'];
		}
		$sql         .= ' WHERE post_type=%s';
		$sql_params[] = self::POST_TYPE;
		if ( $query['hook'] ) {
			$sql         .= ' AND p.post_title=%s';
			$sql_params[] = $query['hook'];
		}
		if ( ! is_null( $query['args'] ) ) {
			$sql         .= ' AND p.post_content=%s';
			$sql_params[] = wp_json_encode( $query['args'] );
		}

		if ( $query['status'] ) {
			$post_statuses = array_map( array( $this, 'get_post_status_by_action_status' ), (array) $query['status'] );
			$placeholders  = array_fill( 0, count( $post_statuses ), '%s' );
			$sql          .= ' AND p.post_status IN (' . join( ', ', $placeholders ) . ')';
			$sql_params    = array_merge( $sql_params, array_values( $post_statuses ) );
		}

		if ( $query['date'] instanceof DateTime ) {
			$date = clone $query['date'];
			$date->setTimezone( new DateTimeZone( 'UTC' ) );
			$date_string  = $date->format( 'Y-m-d H:i:s' );
			$comparator   = $this->validate_sql_comparator( $query['date_compare'] );
			$sql         .= " AND p.post_date_gmt $comparator %s";
			$sql_params[] = $date_string;
		}

		if ( $query['modified'] instanceof DateTime ) {
			$modified = clone $query['modified'];
			$modified->setTimezone( new DateTimeZone( 'UTC' ) );
			$date_string  = $modified->format( 'Y-m-d H:i:s' );
			$comparator   = $this->validate_sql_comparator( $query['modified_compare'] );
			$sql         .= " AND p.post_modified_gmt $comparator %s";
			$sql_params[] = $date_string;
		}

		if ( true === $query['claimed'] ) {
			$sql .= " AND p.post_password != ''";
		} elseif ( false === $query['claimed'] ) {
			$sql .= " AND p.post_password = ''";
		} elseif ( ! is_null( $query['claimed'] ) ) {
			$sql         .= ' AND p.post_password = %s';
			$sql_params[] = $query['claimed'];
		}

		if ( ! empty( $query['search'] ) ) {
			$sql .= ' AND (p.post_title LIKE %s OR p.post_content LIKE %s OR p.post_password LIKE %s)';
			for ( $i = 0; $i < 3; $i++ ) {
				$sql_params[] = sprintf( '%%%s%%', $query['search'] );
			}
		}

		if ( 'select' === $select_or_count ) {
			switch ( $query['orderby'] ) {
				case 'hook':
					$orderby = 'p.post_title';
					break;
				case 'group':
					$orderby = 't.name';
					break;
				case 'status':
					$orderby = 'p.post_status';
					break;
				case 'modified':
					$orderby = 'p.post_modified';
					break;
				case 'claim_id':
					$orderby = 'p.post_password';
					break;
				case 'schedule':
				case 'date':
				default:
					$orderby = 'p.post_date_gmt';
					break;
			}
			if ( 'ASC' === strtoupper( $query['order'] ) ) {
				$order = 'ASC';
			} else {
				$order = 'DESC';
			}
			$sql .= " ORDER BY $orderby $order";
			if ( $query['per_page'] > 0 ) {
				$sql         .= ' LIMIT %d, %d';
				$sql_params[] = $query['offset'];
				$sql_params[] = $query['per_page'];
			}
		}

		return $wpdb->prepare( $sql, $sql_params ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
	}

	/**
	 * Query for action count or list of action IDs.
	 *
	 * @since 3.3.0 $query['status'] accepts array of statuses instead of a single status.
	 *
	 * @see ActionScheduler_Store::query_actions for $query arg usage.
	 *
	 * @param array  $query      Query filtering options.
	 * @param string $query_type Whether to select or count the results. Defaults to select.
	 *
	 * @return string|array|null The IDs of actions matching the query. Null on failure.
	 */
	public function query_actions( $query = array(), $query_type = 'select' ) {
		/**
		 * Global $wpdb object.
		 *
		 * @var wpdb $wpdb
		 */
		global $wpdb;

		$sql = $this->get_query_actions_sql( $query, $query_type );

		return ( 'count' === $query_type ) ? $wpdb->get_var( $sql ) : $wpdb->get_col( $sql ); // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery,WordPress.DB.DirectDatabaseQuery.NoCaching,WordPress.DB.PreparedSQL.NotPrepared
	}

	/**
	 * Get a count of all actions in the store, grouped by status
	 *
	 * @return array
	 */
	public function action_counts() {

		$action_counts_by_status = array();
		$action_stati_and_labels = $this->get_status_labels();
		$posts_count_by_status   = (array) wp_count_posts( self::POST_TYPE, 'readable' );

		foreach ( $posts_count_by_status as $post_status_name => $count ) {

			try {
				$action_status_name = $this->get_action_status_by_post_status( $post_status_name );
			} catch ( Exception $e ) {
				// Ignore any post statuses that aren't for actions.
				continue;
			}
			if ( array_key_exists( $action_status_name, $action_stati_and_labels ) ) {
				$action_counts_by_status[ $action_status_name ] = $count;
			}
		}

		return $action_counts_by_status;
	}

	/**
	 * Cancel action.
	 *
	 * @param int $action_id Action ID.
	 *
	 * @throws InvalidArgumentException If $action_id is not identified.
	 */
	public function cancel_action( $action_id ) {
		$post = get_post( $action_id );
		if ( empty( $post ) || ( self::POST_TYPE !== $post->post_type ) ) {
			/* translators: %s is the action ID */
			throw new InvalidArgumentException( sprintf( __( 'Unidentified action %s: we were unable to cancel this action. It may may have been deleted by another process.', 'action-scheduler' ), $action_id ) );
		}
		do_action( 'action_scheduler_canceled_action', $action_id );
		add_filter( 'pre_wp_unique_post_slug', array( $this, 'set_unique_post_slug' ), 10, 5 );
		wp_trash_post( $action_id );
		remove_filter( 'pre_wp_unique_post_slug', array( $this, 'set_unique_post_slug' ), 10 );
	}

	/**
	 * Delete action.
	 *
	 * @param int $action_id Action ID.
	 * @return void
	 * @throws InvalidArgumentException If action is not identified.
	 */
	public function delete_action( $action_id ) {
		$post = get_post( $action_id );
		if ( empty( $post ) || ( self::POST_TYPE !== $post->post_type ) ) {
			/* translators: %s is the action ID */
			throw new InvalidArgumentException( sprintf( __( 'Unidentified action %s: we were unable to delete this action. It may may have been deleted by another process.', 'action-scheduler' ), $action_id ) );
		}
		do_action( 'action_scheduler_deleted_action', $action_id );

		wp_delete_post( $action_id, true );
	}

	/**
	 * Get date for claim id.
	 *
	 * @param int $action_id Action ID.
	 * @return ActionScheduler_DateTime The date the action is schedule to run, or the date that it ran.
	 */
	public function get_date( $action_id ) {
		$next = $this->get_date_gmt( $action_id );
		return ActionScheduler_TimezoneHelper::set_local_timezone( $next );
	}

	/**
	 * Get Date GMT.
	 *
	 * @param int $action_id Action ID.
	 *
	 * @throws InvalidArgumentException If $action_id is not identified.
	 * @return ActionScheduler_DateTime The date the action is schedule to run, or the date that it ran.
	 */
	public function get_date_gmt( $action_id ) {
		$post = get_post( $action_id );
		if ( empty( $post ) || ( self::POST_TYPE !== $post->post_type ) ) {
			/* translators: %s is the action ID */
			throw new InvalidArgumentException( sprintf( __( 'Unidentified action %s: we were unable to determine the date of this action. It may may have been deleted by another process.', 'action-scheduler' ), $action_id ) );
		}
		if ( 'publish' === $post->post_status ) {
			return as_get_datetime_object( $post->post_modified_gmt );
		} else {
			return as_get_datetime_object( $post->post_date_gmt );
		}
	}

	/**
	 * Stake claim.
	 *
	 * @param int           $max_actions Maximum number of actions.
	 * @param DateTime|null $before_date Jobs must be schedule before this date. Defaults to now.
	 * @param array         $hooks       Claim only actions with a hook or hooks.
	 * @param string        $group       Claim only actions in the given group.
	 *
	 * @return ActionScheduler_ActionClaim
	 * @throws RuntimeException When there is an error staking a claim.
	 * @throws InvalidArgumentException When the given group is not valid.
	 */
	public function stake_claim( $max_actions = 10, ?DateTime $before_date = null, $hooks = array(), $group = '' ) {
		$this->claim_before_date = $before_date;
		$claim_id                = $this->generate_claim_id();
		$this->claim_actions( $claim_id, $max_actions, $before_date, $hooks, $group );
		$action_ids              = $this->find_actions_by_claim_id( $claim_id );
		$this->claim_before_date = null;

		return new ActionScheduler_ActionClaim( $claim_id, $action_ids );
	}

	/**
	 * Get claim count.
	 *
	 * @return int
	 */
	public function get_claim_count() {
		global $wpdb;

		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery,WordPress.DB.DirectDatabaseQuery.NoCaching
		return $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(DISTINCT post_password) FROM {$wpdb->posts} WHERE post_password != '' AND post_type = %s AND post_status IN ('in-progress','pending')",
				array( self::POST_TYPE )
			)
		);
	}

	/**
	 * Generate claim id.
	 *
	 * @return string
	 */
	protected function generate_claim_id() {
		$claim_id = md5( microtime( true ) . wp_rand( 0, 1000 ) );
		return substr( $claim_id, 0, 20 ); // to fit in db field with 20 char limit.
	}

	/**
	 * Claim actions.
	 *
	 * @param string        $claim_id    Claim ID.
	 * @param int           $limit       Limit.
	 * @param DateTime|null $before_date Should use UTC timezone.
	 * @param array         $hooks       Claim only actions with a hook or hooks.
	 * @param string        $group       Claim only actions in the given group.
	 *
	 * @return int The number of actions that were claimed.
	 * @throws RuntimeException  When there is a database error.
	 */
	protected function claim_actions( $claim_id, $limit, ?DateTime $before_date = null, $hooks = array(), $group = '' ) {
		// Set up initial variables.
		$date      = null === $before_date ? as_get_datetime_object() : clone $before_date;
		$limit_ids = ! empty( $group );
		$ids       = $limit_ids ? $this->get_actions_by_group( $group, $limit, $date ) : array();

		// If limiting by IDs and no posts found, then return early since we have nothing to update.
		if ( $limit_ids && 0 === count( $ids ) ) {
			return 0;
		}

		/**
		 * Global wpdb object.
		 *
		 * @var wpdb $wpdb
		 */
		global $wpdb;

		/*
		 * Build up custom query to update the affected posts. Parameters are built as a separate array
		 * to make it easier to identify where they are in the query.
		 *
		 * We can't use $wpdb->update() here because of the "ID IN ..." clause.
		 */
		$update = "UPDATE {$wpdb->posts} SET post_password = %s, post_modified_gmt = %s, post_modified = %s";
		$params = array(
			$claim_id,
			current_time( 'mysql', true ),
			current_time( 'mysql' ),
		);

		// Build initial WHERE clause.
		$where    = "WHERE post_type = %s AND post_status = %s AND post_password = ''";
		$params[] = self::POST_TYPE;
		$params[] = ActionScheduler_Store::STATUS_PENDING;

		if ( ! empty( $hooks ) ) {
			$placeholders = array_fill( 0, count( $hooks ), '%s' );
			$where       .= ' AND post_title IN (' . join( ', ', $placeholders ) . ')';
			$params       = array_merge( $params, array_values( $hooks ) );
		}

		/*
		 * Add the IDs to the WHERE clause. IDs not escaped because they came directly from a prior DB query.
		 *
		 * If we're not limiting by IDs, then include the post_date_gmt clause.
		 */
		if ( $limit_ids ) {
			$where .= ' AND ID IN (' . join( ',', $ids ) . ')';
		} else {
			$where   .= ' AND post_date_gmt <= %s';
			$params[] = $date->format( 'Y-m-d H:i:s' );
		}

		// Add the ORDER BY clause and,ms limit.
		$order    = 'ORDER BY menu_order ASC, post_date_gmt ASC, ID ASC LIMIT %d';
		$params[] = $limit;

		// Run the query and gather results.
		$rows_affected = $wpdb->query( $wpdb->prepare( "{$update} {$where} {$order}", $params ) ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare

		if ( false === $rows_affected ) {
			throw new RuntimeException( __( 'Unable to claim actions. Database error.', 'action-scheduler' ) );
		}

		return (int) $rows_affected;
	}

	/**
	 * Get IDs of actions within a certain group and up to a certain date/time.
	 *
	 * @param string   $group The group to use in finding actions.
	 * @param int      $limit The number of actions to retrieve.
	 * @param DateTime $date  DateTime object representing cutoff time for actions. Actions retrieved will be
	 *                        up to and including this DateTime.
	 *
	 * @return array IDs of actions in the appropriate group and before the appropriate time.
	 * @throws InvalidArgumentException When the group does not exist.
	 */
	protected function get_actions_by_group( $group, $limit, DateTime $date ) {
		// Ensure the group exists before continuing.
		if ( ! term_exists( $group, self::GROUP_TAXONOMY ) ) {
			/* translators: %s is the group name */
			throw new InvalidArgumentException( sprintf( __( 'The group "%s" does not exist.', 'action-scheduler' ), $group ) );
		}

		// Set up a query for post IDs to use later.
		$query      = new WP_Query();
		$query_args = array(
			'fields'           => 'ids',
			'post_type'        => self::POST_TYPE,
			'post_status'      => ActionScheduler_Store::STATUS_PENDING,
			'has_password'     => false,
			'posts_per_page'   => $limit * 3,
			'suppress_filters' => true, // phpcs:ignore WordPressVIPMinimum.Performance.WPQueryParams.SuppressFilters_suppress_filters
			'no_found_rows'    => true,
			'orderby'          => array(
				'menu_order' => 'ASC',
				'date'       => 'ASC',
				'ID'         => 'ASC',
			),
			'date_query'       => array(
				'column'    => 'post_date_gmt',
				'before'    => $date->format( 'Y-m-d H:i' ),
				'inclusive' => true,
			),
			'tax_query'        => array( // phpcs:ignore WordPress.DB.SlowDBQuery
				array(
					'taxonomy'         => self::GROUP_TAXONOMY,
					'field'            => 'slug',
					'terms'            => $group,
					'include_children' => false,
				),
			),
		);

		return $query->query( $query_args );
	}

	/**
	 * Find actions by claim ID.
	 *
	 * @param string $claim_id Claim ID.
	 * @return array
	 */
	public function find_actions_by_claim_id( $claim_id ) {
		/**
		 * Global wpdb object.
		 *
		 * @var wpdb $wpdb
		 */
		global $wpdb;

		$action_ids  = array();
		$before_date = isset( $this->claim_before_date ) ? $this->claim_before_date : as_get_datetime_object();
		$cut_off     = $before_date->format( 'Y-m-d H:i:s' );

		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
		$results = $wpdb->get_results(
			$wpdb->prepare(
				"SELECT ID, post_date_gmt FROM {$wpdb->posts} WHERE post_type = %s AND post_password = %s",
				array(
					self::POST_TYPE,
					$claim_id,
				)
			)
		);

		// Verify that the scheduled date for each action is within the expected bounds (in some unusual
		// cases, we cannot depend on MySQL to honor all of the WHERE conditions we specify).
		foreach ( $results as $claimed_action ) {
			if ( $claimed_action->post_date_gmt <= $cut_off ) {
				$action_ids[] = absint( $claimed_action->ID );
			}
		}

		return $action_ids;
	}

	/**
	 * Release claim.
	 *
	 * @param ActionScheduler_ActionClaim $claim Claim object to release.
	 * @return void
	 * @throws RuntimeException When the claim is not unlocked.
	 */
	public function release_claim( ActionScheduler_ActionClaim $claim ) {
		$action_ids = $this->find_actions_by_claim_id( $claim->get_id() );
		if ( empty( $action_ids ) ) {
			return; // nothing to do.
		}
		$action_id_string = implode( ',', array_map( 'intval', $action_ids ) );
		/**
		 * Global wpdb object.
		 *
		 * @var wpdb $wpdb
		 */
		global $wpdb;

		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
		$result = $wpdb->query(
			$wpdb->prepare(
				"UPDATE {$wpdb->posts} SET post_password = '' WHERE ID IN ($action_id_string) AND post_password = %s", //phpcs:ignore
				array(
					$claim->get_id(),
				)
			)
		);
		if ( false === $result ) {
			/* translators: %s: claim ID */
			throw new RuntimeException( sprintf( __( 'Unable to unlock claim %s. Database error.', 'action-scheduler' ), $claim->get_id() ) );
		}
	}

	/**
	 * Unclaim action.
	 *
	 * @param string $action_id Action ID.
	 * @throws RuntimeException When unable to unlock claim on action ID.
	 */
	public function unclaim_action( $action_id ) {
		/**
		 * Global wpdb object.
		 *
		 * @var wpdb $wpdb
		 */
		global $wpdb;

		//phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
		$result = $wpdb->query(
			$wpdb->prepare(
				"UPDATE {$wpdb->posts} SET post_password = '' WHERE ID = %d AND post_type = %s",
				$action_id,
				self::POST_TYPE
			)
		);
		if ( false === $result ) {
			/* translators: %s: action ID */
			throw new RuntimeException( sprintf( __( 'Unable to unlock claim on action %s. Database error.', 'action-scheduler' ), $action_id ) );
		}
	}

	/**
	 * Mark failure on action.
	 *
	 * @param int $action_id Action ID.
	 *
	 * @return void
	 * @throws RuntimeException When unable to mark failure on action ID.
	 */
	public function mark_failure( $action_id ) {
		/**
		 * Global wpdb object.
		 *
		 * @var wpdb $wpdb
		 */
		global $wpdb;

		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
		$result = $wpdb->query(
			$wpdb->prepare( "UPDATE {$wpdb->posts} SET post_status = %s WHERE ID = %d AND post_type = %s", self::STATUS_FAILED, $action_id, self::POST_TYPE )
		);
		if ( false === $result ) {
			/* translators: %s: action ID */
			throw new RuntimeException( sprintf( __( 'Unable to mark failure on action %s. Database error.', 'action-scheduler' ), $action_id ) );
		}
	}

	/**
	 * Return an action's claim ID, as stored in the post password column
	 *
	 * @param int $action_id Action ID.
	 * @return mixed
	 */
	public function get_claim_id( $action_id ) {
		return $this->get_post_column( $action_id, 'post_password' );
	}

	/**
	 * Return an action's status, as stored in the post status column
	 *
	 * @param int $action_id Action ID.
	 *
	 * @return mixed
	 * @throws InvalidArgumentException When the action ID is invalid.
	 */
	public function get_status( $action_id ) {
		$status = $this->get_post_column( $action_id, 'post_status' );

		if ( null === $status ) {
			throw new InvalidArgumentException( __( 'Invalid action ID. No status found.', 'action-scheduler' ) );
		}

		return $this->get_action_status_by_post_status( $status );
	}

	/**
	 * Get post column
	 *
	 * @param string $action_id Action ID.
	 * @param string $column_name Column Name.
	 *
	 * @return string|null
	 */
	private function get_post_column( $action_id, $column_name ) {
		/**
		 * Global wpdb object.
		 *
		 * @var wpdb $wpdb
		 */
		global $wpdb;

		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
		return $wpdb->get_var(
			$wpdb->prepare(
				"SELECT {$column_name} FROM {$wpdb->posts} WHERE ID=%d AND post_type=%s", // phpcs:ignore
				$action_id,
				self::POST_TYPE
			)
		);
	}

	/**
	 * Log Execution.
	 *
	 * @throws Exception If the action status cannot be updated to self::STATUS_RUNNING ('in-progress').
	 *
	 * @param string $action_id Action ID.
	 */
	public function log_execution( $action_id ) {
		/**
		 * Global wpdb object.
		 *
		 * @var wpdb $wpdb
		 */
		global $wpdb;

		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
		$status_updated = $wpdb->query(
			$wpdb->prepare(
				"UPDATE {$wpdb->posts} SET menu_order = menu_order+1, post_status=%s, post_modified_gmt = %s, post_modified = %s WHERE ID = %d AND post_type = %s",
				self::STATUS_RUNNING,
				current_time( 'mysql', true ),
				current_time( 'mysql' ),
				$action_id,
				self::POST_TYPE
			)
		);

		if ( ! $status_updated ) {
			throw new Exception(
				sprintf(
					/* translators: 1: action ID. 2: status slug. */
					__( 'Unable to update the status of action %1$d to %2$s.', 'action-scheduler' ),
					$action_id,
					self::STATUS_RUNNING
				)
			);
		}
	}

	/**
	 * Record that an action was completed.
	 *
	 * @param string $action_id ID of the completed action.
	 *
	 * @throws InvalidArgumentException When the action ID is invalid.
	 * @throws RuntimeException         When there was an error executing the action.
	 */
	public function mark_complete( $action_id ) {
		$post = get_post( $action_id );
		if ( empty( $post ) || ( self::POST_TYPE !== $post->post_type ) ) {
			/* translators: %s is the action ID */
			throw new InvalidArgumentException( sprintf( __( 'Unidentified action %s: we were unable to mark this action as having completed. It may may have been deleted by another process.', 'action-scheduler' ), $action_id ) );
		}
		add_filter( 'wp_insert_post_data', array( $this, 'filter_insert_post_data' ), 10, 1 );
		add_filter( 'pre_wp_unique_post_slug', array( $this, 'set_unique_post_slug' ), 10, 5 );
		$result = wp_update_post(
			array(
				'ID'          => $action_id,
				'post_status' => 'publish',
			),
			true
		);
		remove_filter( 'wp_insert_post_data', array( $this, 'filter_insert_post_data' ), 10 );
		remove_filter( 'pre_wp_unique_post_slug', array( $this, 'set_unique_post_slug' ), 10 );
		if ( is_wp_error( $result ) ) {
			throw new RuntimeException( $result->get_error_message() );
		}

		/**
		 * Fires after a scheduled action has been completed.
		 *
		 * @since 3.4.2
		 *
		 * @param int $action_id Action ID.
		 */
		do_action( 'action_scheduler_completed_action', $action_id );
	}

	/**
	 * Mark action as migrated when there is an error deleting the action.
	 *
	 * @param int $action_id Action ID.
	 */
	public function mark_migrated( $action_id ) {
		wp_update_post(
			array(
				'ID'          => $action_id,
				'post_status' => 'migrated',
			)
		);
	}

	/**
	 * Determine whether the post store can be migrated.
	 *
	 * @param [type] $setting - Setting value.
	 * @return bool
	 */
	public function migration_dependencies_met( $setting ) {
		global $wpdb;

		$dependencies_met = get_transient( self::DEPENDENCIES_MET );
		if ( empty( $dependencies_met ) ) {
			$maximum_args_length = apply_filters( 'action_scheduler_maximum_args_length', 191 );
			$found_action        = $wpdb->get_var( // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
				$wpdb->prepare(
					"SELECT ID FROM {$wpdb->posts} WHERE post_type = %s AND CHAR_LENGTH(post_content) > %d LIMIT 1",
					$maximum_args_length,
					self::POST_TYPE
				)
			);
			$dependencies_met    = $found_action ? 'no' : 'yes';
			set_transient( self::DEPENDENCIES_MET, $dependencies_met, DAY_IN_SECONDS );
		}

		return 'yes' === $dependencies_met ? $setting : false;
	}

	/**
	 * InnoDB indexes have a maximum size of 767 bytes by default, which is only 191 characters with utf8mb4.
	 *
	 * Previously, AS wasn't concerned about args length, as we used the (unindex) post_content column. However,
	 * as we prepare to move to custom tables, and can use an indexed VARCHAR column instead, we want to warn
	 * developers of this impending requirement.
	 *
	 * @param ActionScheduler_Action $action Action object.
	 */
	protected function validate_action( ActionScheduler_Action $action ) {
		try {
			parent::validate_action( $action );
		} catch ( Exception $e ) {
			/* translators: %s is the error message */
			$message = sprintf( __( '%s Support for strings longer than this will be removed in a future version.', 'action-scheduler' ), $e->getMessage() );
			_doing_it_wrong( 'ActionScheduler_Action::$args', esc_html( $message ), '2.1.0' );
		}
	}

	/**
	 * (@codeCoverageIgnore)
	 */
	public function init() {
		add_filter( 'action_scheduler_migration_dependencies_met', array( $this, 'migration_dependencies_met' ) );

		$post_type_registrar = new ActionScheduler_wpPostStore_PostTypeRegistrar();
		$post_type_registrar->register();

		$post_status_registrar = new ActionScheduler_wpPostStore_PostStatusRegistrar();
		$post_status_registrar->register();

		$taxonomy_registrar = new ActionScheduler_wpPostStore_TaxonomyRegistrar();
		$taxonomy_registrar->register();
	}
}