<?php
/**
 * Recent events provider.
 *
 * @package ZeroSpamForms
 */

namespace TwoOTwoCode\ZeroSpamForms\Logging;

defined( 'ABSPATH' ) || exit;

use TwoOTwoCode\ZeroSpamForms\Core\Settings\SettingsRepository;
use TwoOTwoCode\ZeroSpamForms\Engine\ReasonCodeRegistry;

/**
 * Provides safe recent event rows for the dashboard.
 */
final class RecentEventsProvider {
	/**
	 * Event store.
	 *
	 * @var EventStoreInterface
	 */
	private $event_store;

	/**
	 * Settings repository.
	 *
	 * @var SettingsRepository
	 */
	private $settings_repository;

	/**
	 * Reason code registry.
	 *
	 * @var ReasonCodeRegistry
	 */
	private $reason_code_registry;

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

	/**
	 * Constructor.
	 *
	 * @param EventStoreInterface        $event_store          Event store.
	 * @param SettingsRepository         $settings_repository  Settings repository.
	 * @param ReasonCodeRegistry|null    $reason_code_registry Reason registry.
	 * @param EventRetentionService|null $retention_service    Retention service.
	 */
	public function __construct(
		EventStoreInterface $event_store,
		SettingsRepository $settings_repository,
		?ReasonCodeRegistry $reason_code_registry = null,
		?EventRetentionService $retention_service = null
	) {
		$this->event_store          = $event_store;
		$this->settings_repository  = $settings_repository;
		$this->reason_code_registry = $reason_code_registry instanceof ReasonCodeRegistry ? $reason_code_registry : new ReasonCodeRegistry();
		$this->retention_service    = $retention_service instanceof EventRetentionService ? $retention_service : new EventRetentionService();
	}

	/**
	 * Get recent events allowed by the current logging settings.
	 *
	 * @param int $limit Limit.
	 *
	 * @return array<int, array{created_at:int,source_key:string,action:string,score:int,reason_labels:array<int,string>}>
	 */
	public function get_recent_events( int $limit = 5 ): array {
		$settings = $this->settings_repository->get_settings();
		$actions  = array( SpamEvent::ACTION_BLOCKED, SpamEvent::ACTION_SUSPICIOUS );

		if ( ! empty( $settings['log_allowed_events'] ) ) {
			$actions[] = SpamEvent::ACTION_ALLOWED;
		}

		$events = $this->retention_service->filter_events(
			$this->event_store->get_events(),
			(int) $settings['event_retention_days'],
			(int) $settings['max_event_records']
		);
		$limit  = max( 1, min( 20, $limit ) );
		$rows   = array();

		foreach ( $events as $event ) {
			if ( ! in_array( $event->get_action(), $actions, true ) ) {
				continue;
			}

			$rows[] = array(
				'created_at'    => $event->get_created_at(),
				'source_key'    => $event->get_source_key(),
				'action'        => $event->get_action(),
				'score'         => $event->get_score(),
				'reason_labels' => $this->get_reason_labels( $event->get_reason_codes(), $event->get_action() ),
			);

			if ( count( $rows ) >= $limit ) {
				break;
			}
		}

		return $rows;
	}

	/**
	 * Get safe reason labels.
	 *
	 * @param array<int, string> $reason_codes Reason codes.
	 * @param string             $action       Event action.
	 *
	 * @return array<int, string>
	 */
	private function get_reason_labels( array $reason_codes, string $action ): array {
		$labels = array();

		foreach ( $reason_codes as $reason_code ) {
			$labels[] = $this->reason_code_registry->get_label( $reason_code );
		}

		if ( array() === $labels ) {
			if ( SpamEvent::ACTION_ALLOWED === $action ) {
				$labels[] = function_exists( '__' ) ? __( 'No spam signals detected.', '2o2code-spamless-forms' ) : 'No spam signals detected.';
			} else {
				$labels[] = function_exists( '__' ) ? __( 'Spam signal detected.', '2o2code-spamless-forms' ) : 'Spam signal detected.';
			}
		}

		return $labels;
	}
}