<?php
/**
 * Option-backed event store.
 *
 * @package ZeroSpamForms
 */

namespace TwoOTwoCode\ZeroSpamForms\Logging;

defined( 'ABSPATH' ) || exit;

/**
 * Stores a bounded list of privacy-safe events in one WordPress option.
 */
final class OptionEventStore implements EventStoreInterface {
	/**
	 * Event storage option.
	 */
	public const OPTION_NAME = 'twootwocode_zsf_events';

	/**
	 * Retention service.
	 *
	 * @var EventRetentionService
	 */
	private $retention_service;

	/**
	 * Constructor.
	 *
	 * @param EventRetentionService|null $retention_service Retention service.
	 */
	public function __construct( ?EventRetentionService $retention_service = null ) {
		$this->retention_service = $retention_service instanceof EventRetentionService ? $retention_service : new EventRetentionService();
	}

	/**
	 * Add an event and apply retention bounds.
	 *
	 * @param SpamEvent $event          Event.
	 * @param int       $retention_days Retention days.
	 * @param int       $max_records    Max records.
	 */
	public function add_event( SpamEvent $event, int $retention_days, int $max_records ): bool {
		if ( ! function_exists( 'update_option' ) ) {
			return false;
		}

		$events   = $this->get_events();
		$events[] = $event;
		$events   = $this->retention_service->filter_events( $events, $retention_days, $max_records );

		return (bool) update_option( self::OPTION_NAME, $this->events_to_arrays( $events ), false );
	}

	/**
	 * Get stored events.
	 *
	 * @return array<int, SpamEvent>
	 */
	public function get_events(): array {
		if ( ! function_exists( 'get_option' ) ) {
			return array();
		}

		$stored = get_option( self::OPTION_NAME, array() );

		if ( ! is_array( $stored ) ) {
			return array();
		}

		$events = array();

		foreach ( $stored as $event_data ) {
			if ( is_array( $event_data ) ) {
				$events[] = SpamEvent::from_array( $event_data );
			}
		}

		return $this->retention_service->filter_events( $events, 90, 1000 );
	}

	/**
	 * Count stored events.
	 */
	public function count_events(): int {
		return count( $this->get_events() );
	}

	/**
	 * Convert events to arrays.
	 *
	 * @param array<int, SpamEvent> $events Events.
	 *
	 * @return array<int, array<string, int|string|array<int, string>>>
	 */
	private function events_to_arrays( array $events ): array {
		$event_arrays = array();

		foreach ( $events as $event ) {
			if ( $event instanceof SpamEvent ) {
				$event_arrays[] = $event->to_array();
			}
		}

		return $event_arrays;
	}
}