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<?php
/**
 * General API functions for scheduling actions
 *
 * @package ActionScheduler.
 */

/**
 * Enqueue an action to run one time, as soon as possible
 *
 * @param string $hook The hook to trigger.
 * @param array  $args Arguments to pass when the hook triggers.
 * @param string $group The group to assign this job to.
 * @param bool   $unique Whether the action should be unique.
 *
 * @return int The action ID.
 */
function as_enqueue_async_action( $hook, $args = array(), $group = '', $unique = false ) {
	if ( ! ActionScheduler::is_initialized( __FUNCTION__ ) ) {
		return 0;
	}

	/**
	 * Provides an opportunity to short-circuit the default process for enqueuing async
	 * actions.
	 *
	 * Returning a value other than null from the filter will short-circuit the normal
	 * process. The expectation in such a scenario is that callbacks will return an integer
	 * representing the enqueued action ID (enqueued using some alternative process) or else
	 * zero.
	 *
	 * @param int|null $pre_option The value to return instead of the option value.
	 * @param string   $hook       Action hook.
	 * @param array    $args       Action arguments.
	 * @param string   $group      Action group.
	 */
	$pre = apply_filters( 'pre_as_enqueue_async_action', null, $hook, $args, $group );
	if ( null !== $pre ) {
		return is_int( $pre ) ? $pre : 0;
	}

	return ActionScheduler::factory()->async_unique( $hook, $args, $group, $unique );
}

/**
 * Schedule an action to run one time
 *
 * @param int    $timestamp When the job will run.
 * @param string $hook The hook to trigger.
 * @param array  $args Arguments to pass when the hook triggers.
 * @param string $group The group to assign this job to.
 * @param bool   $unique Whether the action should be unique.
 *
 * @return int The action ID.
 */
function as_schedule_single_action( $timestamp, $hook, $args = array(), $group = '', $unique = false ) {
	if ( ! ActionScheduler::is_initialized( __FUNCTION__ ) ) {
		return 0;
	}

	/**
	 * Provides an opportunity to short-circuit the default process for enqueuing single
	 * actions.
	 *
	 * Returning a value other than null from the filter will short-circuit the normal
	 * process. The expectation in such a scenario is that callbacks will return an integer
	 * representing the scheduled action ID (scheduled using some alternative process) or else
	 * zero.
	 *
	 * @param int|null $pre_option The value to return instead of the option value.
	 * @param int      $timestamp  When the action will run.
	 * @param string   $hook       Action hook.
	 * @param array    $args       Action arguments.
	 * @param string   $group      Action group.
	 */
	$pre = apply_filters( 'pre_as_schedule_single_action', null, $timestamp, $hook, $args, $group );
	if ( null !== $pre ) {
		return is_int( $pre ) ? $pre : 0;
	}

	return ActionScheduler::factory()->single_unique( $hook, $args, $timestamp, $group, $unique );
}

/**
 * Schedule a recurring action
 *
 * @param int    $timestamp When the first instance of the job will run.
 * @param int    $interval_in_seconds How long to wait between runs.
 * @param string $hook The hook to trigger.
 * @param array  $args Arguments to pass when the hook triggers.
 * @param string $group The group to assign this job to.
 * @param bool   $unique Whether the action should be unique.
 *
 * @return int The action ID.
 */
function as_schedule_recurring_action( $timestamp, $interval_in_seconds, $hook, $args = array(), $group = '', $unique = false ) {
	if ( ! ActionScheduler::is_initialized( __FUNCTION__ ) ) {
		return 0;
	}

	/**
	 * Provides an opportunity to short-circuit the default process for enqueuing recurring
	 * actions.
	 *
	 * Returning a value other than null from the filter will short-circuit the normal
	 * process. The expectation in such a scenario is that callbacks will return an integer
	 * representing the scheduled action ID (scheduled using some alternative process) or else
	 * zero.
	 *
	 * @param int|null $pre_option          The value to return instead of the option value.
	 * @param int      $timestamp           When the action will run.
	 * @param int      $interval_in_seconds How long to wait between runs.
	 * @param string   $hook                Action hook.
	 * @param array    $args                Action arguments.
	 * @param string   $group               Action group.
	 */
	$pre = apply_filters( 'pre_as_schedule_recurring_action', null, $timestamp, $interval_in_seconds, $hook, $args, $group );
	if ( null !== $pre ) {
		return is_int( $pre ) ? $pre : 0;
	}

	return ActionScheduler::factory()->recurring_unique( $hook, $args, $timestamp, $interval_in_seconds, $group, $unique );
}

/**
 * Schedule an action that recurs on a cron-like schedule.
 *
 * @param int    $timestamp The first instance of the action will be scheduled
 *           to run at a time calculated after this timestamp matching the cron
 *           expression. This can be used to delay the first instance of the action.
 * @param string $schedule A cron-link schedule string.
 * @see http://en.wikipedia.org/wiki/Cron
 *   *    *    *    *    *    *
 *   ┬    ┬    ┬    ┬    ┬    ┬
 *   |    |    |    |    |    |
 *   |    |    |    |    |    + year [optional]
 *   |    |    |    |    +----- day of week (0 - 7) (Sunday=0 or 7)
 *   |    |    |    +---------- month (1 - 12)
 *   |    |    +--------------- day of month (1 - 31)
 *   |    +-------------------- hour (0 - 23)
 *   +------------------------- min (0 - 59)
 * @param string $hook The hook to trigger.
 * @param array  $args Arguments to pass when the hook triggers.
 * @param string $group The group to assign this job to.
 * @param bool   $unique Whether the action should be unique.
 *
 * @return int The action ID.
 */
function as_schedule_cron_action( $timestamp, $schedule, $hook, $args = array(), $group = '', $unique = false ) {
	if ( ! ActionScheduler::is_initialized( __FUNCTION__ ) ) {
		return 0;
	}

	/**
	 * Provides an opportunity to short-circuit the default process for enqueuing cron
	 * actions.
	 *
	 * Returning a value other than null from the filter will short-circuit the normal
	 * process. The expectation in such a scenario is that callbacks will return an integer
	 * representing the scheduled action ID (scheduled using some alternative process) or else
	 * zero.
	 *
	 * @param int|null $pre_option The value to return instead of the option value.
	 * @param int      $timestamp  When the action will run.
	 * @param string   $schedule   Cron-like schedule string.
	 * @param string   $hook       Action hook.
	 * @param array    $args       Action arguments.
	 * @param string   $group      Action group.
	 */
	$pre = apply_filters( 'pre_as_schedule_cron_action', null, $timestamp, $schedule, $hook, $args, $group );
	if ( null !== $pre ) {
		return is_int( $pre ) ? $pre : 0;
	}

	return ActionScheduler::factory()->cron_unique( $hook, $args, $timestamp, $schedule, $group, $unique );
}

/**
 * Cancel the next occurrence of a scheduled action.
 *
 * While only the next instance of a recurring or cron action is unscheduled by this method, that will also prevent
 * all future instances of that recurring or cron action from being run. Recurring and cron actions are scheduled in
 * a sequence instead of all being scheduled at once. Each successive occurrence of a recurring action is scheduled
 * only after the former action is run. If the next instance is never run, because it's unscheduled by this function,
 * then the following instance will never be scheduled (or exist), which is effectively the same as being unscheduled
 * by this method also.
 *
 * @param string $hook The hook that the job will trigger.
 * @param array  $args Args that would have been passed to the job.
 * @param string $group The group the job is assigned to.
 *
 * @return int|null The scheduled action ID if a scheduled action was found, or null if no matching action found.
 */
function as_unschedule_action( $hook, $args = array(), $group = '' ) {
	if ( ! ActionScheduler::is_initialized( __FUNCTION__ ) ) {
		return 0;
	}
	$params = array(
		'hook'    => $hook,
		'status'  => ActionScheduler_Store::STATUS_PENDING,
		'orderby' => 'date',
		'order'   => 'ASC',
		'group'   => $group,
	);
	if ( is_array( $args ) ) {
		$params['args'] = $args;
	}

	$action_id = ActionScheduler::store()->query_action( $params );

	if ( $action_id ) {
		try {
			ActionScheduler::store()->cancel_action( $action_id );
		} catch ( Exception $exception ) {
			ActionScheduler::logger()->log(
				$action_id,
				sprintf(
					/* translators: %s is the name of the hook to be cancelled. */
					__( 'Caught exception while cancelling action: %s', 'woocommerce' ),
					esc_attr( $hook )
				)
			);

			$action_id = null;
		}
	}

	return $action_id;
}

/**
 * Cancel all occurrences of a scheduled action.
 *
 * @param string $hook The hook that the job will trigger.
 * @param array  $args Args that would have been passed to the job.
 * @param string $group The group the job is assigned to.
 */
function as_unschedule_all_actions( $hook, $args = array(), $group = '' ) {
	if ( ! ActionScheduler::is_initialized( __FUNCTION__ ) ) {
		return;
	}
	if ( empty( $args ) ) {
		if ( ! empty( $hook ) && empty( $group ) ) {
			ActionScheduler_Store::instance()->cancel_actions_by_hook( $hook );
			return;
		}
		if ( ! empty( $group ) && empty( $hook ) ) {
			ActionScheduler_Store::instance()->cancel_actions_by_group( $group );
			return;
		}
	}
	do {
		$unscheduled_action = as_unschedule_action( $hook, $args, $group );
	} while ( ! empty( $unscheduled_action ) );
}

/**
 * Check if there is an existing action in the queue with a given hook, args and group combination.
 *
 * An action in the queue could be pending, in-progress or async. If the is pending for a time in
 * future, its scheduled date will be returned as a timestamp. If it is currently being run, or an
 * async action sitting in the queue waiting to be processed, in which case boolean true will be
 * returned. Or there may be no async, in-progress or pending action for this hook, in which case,
 * boolean false will be the return value.
 *
 * @param string $hook Name of the hook to search for.
 * @param array  $args Arguments of the action to be searched.
 * @param string $group Group of the action to be searched.
 *
 * @return int|bool The timestamp for the next occurrence of a pending scheduled action, true for an async or in-progress action or false if there is no matching action.
 */
function as_next_scheduled_action( $hook, $args = null, $group = '' ) {
	if ( ! ActionScheduler::is_initialized( __FUNCTION__ ) ) {
		return false;
	}

	$params = array(
		'hook'    => $hook,
		'orderby' => 'date',
		'order'   => 'ASC',
		'group'   => $group,
	);

	if ( is_array( $args ) ) {
		$params['args'] = $args;
	}

	$params['status'] = ActionScheduler_Store::STATUS_RUNNING;
	$action_id        = ActionScheduler::store()->query_action( $params );
	if ( $action_id ) {
		return true;
	}

	$params['status'] = ActionScheduler_Store::STATUS_PENDING;
	$action_id        = ActionScheduler::store()->query_action( $params );
	if ( null === $action_id ) {
		return false;
	}

	$action         = ActionScheduler::store()->fetch_action( $action_id );
	$scheduled_date = $action->get_schedule()->get_date();
	if ( $scheduled_date ) {
		return (int) $scheduled_date->format( 'U' );
	} elseif ( null === $scheduled_date ) { // pending async action with NullSchedule.
		return true;
	}

	return false;
}

/**
 * Check if there is a scheduled action in the queue but more efficiently than as_next_scheduled_action().
 *
 * It's recommended to use this function when you need to know whether a specific action is currently scheduled
 * (pending or in-progress).
 *
 * @since 3.3.0
 *
 * @param string $hook  The hook of the action.
 * @param array  $args  Args that have been passed to the action. Null will matches any args.
 * @param string $group The group the job is assigned to.
 *
 * @return bool True if a matching action is pending or in-progress, false otherwise.
 */
function as_has_scheduled_action( $hook, $args = null, $group = '' ) {
	if ( ! ActionScheduler::is_initialized( __FUNCTION__ ) ) {
		return false;
	}

	$query_args = array(
		'hook'    => $hook,
		'status'  => array( ActionScheduler_Store::STATUS_RUNNING, ActionScheduler_Store::STATUS_PENDING ),
		'group'   => $group,
		'orderby' => 'none',
	);

	if ( null !== $args ) {
		$query_args['args'] = $args;
	}

	$action_id = ActionScheduler::store()->query_action( $query_args );

	return null !== $action_id;
}

/**
 * Find scheduled actions
 *
 * @param array  $args Possible arguments, with their default values.
 *         'hook' => '' - the name of the action that will be triggered.
 *         'args' => NULL - the args array that will be passed with the action.
 *         'date' => NULL - the scheduled date of the action. Expects a DateTime object, a unix timestamp, or a string that can parsed with strtotime(). Used in UTC timezone.
 *         'date_compare' => '<=' - operator for testing "date". accepted values are '!=', '>', '>=', '<', '<=', '='.
 *         'modified' => NULL - the date the action was last updated. Expects a DateTime object, a unix timestamp, or a string that can parsed with strtotime(). Used in UTC timezone.
 *         'modified_compare' => '<=' - operator for testing "modified". accepted values are '!=', '>', '>=', '<', '<=', '='.
 *         'group' => '' - the group the action belongs to.
 *         'status' => '' - ActionScheduler_Store::STATUS_COMPLETE or ActionScheduler_Store::STATUS_PENDING.
 *         'claimed' => NULL - TRUE to find claimed actions, FALSE to find unclaimed actions, a string to find a specific claim ID.
 *         'per_page' => 5 - Number of results to return.
 *         'offset' => 0.
 *         'orderby' => 'date' - accepted values are 'hook', 'group', 'modified', 'date' or 'none'.
 *         'order' => 'ASC'.
 *
 * @param string $return_format OBJECT, ARRAY_A, or ids.
 *
 * @return array
 */
function as_get_scheduled_actions( $args = array(), $return_format = OBJECT ) {
	if ( ! ActionScheduler::is_initialized( __FUNCTION__ ) ) {
		return array();
	}
	$store = ActionScheduler::store();
	foreach ( array( 'date', 'modified' ) as $key ) {
		if ( isset( $args[ $key ] ) ) {
			$args[ $key ] = as_get_datetime_object( $args[ $key ] );
		}
	}
	$ids = $store->query_actions( $args );

	if ( 'ids' === $return_format || 'int' === $return_format ) {
		return $ids;
	}

	$actions = array();
	foreach ( $ids as $action_id ) {
		$actions[ $action_id ] = $store->fetch_action( $action_id );
	}

	if ( ARRAY_A == $return_format ) {
		foreach ( $actions as $action_id => $action_object ) {
			$actions[ $action_id ] = get_object_vars( $action_object );
		}
	}

	return $actions;
}

/**
 * Helper function to create an instance of DateTime based on a given
 * string and timezone. By default, will return the current date/time
 * in the UTC timezone.
 *
 * Needed because new DateTime() called without an explicit timezone
 * will create a date/time in PHP's timezone, but we need to have
 * assurance that a date/time uses the right timezone (which we almost
 * always want to be UTC), which means we need to always include the
 * timezone when instantiating datetimes rather than leaving it up to
 * the PHP default.
 *
 * @param mixed  $date_string A date/time string. Valid formats are explained in http://php.net/manual/en/datetime.formats.php.
 * @param string $timezone A timezone identifier, like UTC or Europe/Lisbon. The list of valid identifiers is available http://php.net/manual/en/timezones.php.
 *
 * @return ActionScheduler_DateTime
 */
function as_get_datetime_object( $date_string = null, $timezone = 'UTC' ) {
	if ( is_object( $date_string ) && $date_string instanceof DateTime ) {
		$date = new ActionScheduler_DateTime( $date_string->format( 'Y-m-d H:i:s' ), new DateTimeZone( $timezone ) );
	} elseif ( is_numeric( $date_string ) ) {
		$date = new ActionScheduler_DateTime( '@' . $date_string, new DateTimeZone( $timezone ) );
	} else {
		$date = new ActionScheduler_DateTime( null === $date_string ? 'now' : $date_string, new DateTimeZone( $timezone ) );
	}
	return $date;
}