<?php

namespace SiteSync;

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

/**
 * Handles scheduling and execution of Site Sync cron jobs.
 */
class Cron {
    public const HOOK             = 'site_sync_run';
    public const DEFAULT_INTERVAL = 'site_sync_5min';

    /**
     * Site Sync settings instance.
     *
     * @var Settings
     */
    private $settings;

    /**
     * Cron constructor.
     *
     * @param Settings $settings Site Sync settings instance.
     */
    public function __construct( Settings $settings ) {
        $this->settings = $settings;
    }

    /**
     * Registers cron schedule and sync run hooks.
     *
     * @return void
     */
    public function hooks(): void {
        add_filter( 'cron_schedules', array( $this, 'add_schedule' ) ); // phpcs:ignore
        add_action( self::HOOK, array( $this, 'run_sync' ) );
    }

    /**
     * Adds a custom schedule interval for Site Sync cron jobs.
     *
     * @param array $schedules Existing cron schedules.
     * @return array Modified cron schedules with Site Sync interval.
     */
    public function add_schedule( array $schedules ): array {
        if ( ! isset( $schedules[ self::DEFAULT_INTERVAL ] ) ) {
            $schedules[ self::DEFAULT_INTERVAL ] = array(
                'interval' => 5 * MINUTE_IN_SECONDS,
                'display'  => __( 'Every 5 minutes (Site Sync)', 'site-sync' ),
            );
        }

        return $schedules;
    }

    /**
     * Configures the Site Sync cron event by enabling or disabling it and setting the interval.
     *
     * @param bool   $enabled  Whether to enable the cron event.
     * @param string $interval The interval for the cron event. Defaults to self::DEFAULT_INTERVAL.
     *
     * @return void
     */
    public static function configure( bool $enabled, string $interval = self::DEFAULT_INTERVAL ): void {
        $interval = $interval ? $interval : self::DEFAULT_INTERVAL;

        if ( $enabled ) {
            // Reset any existing schedule to honor new intervals.
            wp_clear_scheduled_hook( self::HOOK );
            wp_schedule_event( time() + MINUTE_IN_SECONDS, $interval, self::HOOK );
        } else {
            self::clear_event();
        }
    }

    /**
     * Clears the scheduled Site Sync cron event.
     *
     * @return void
     */
    public static function clear_event(): void {
        wp_clear_scheduled_hook( self::HOOK );
    }

    /**
     * Executes the Site Sync cron job by triggering the sync cycle action.
     *
     * @return void
     */
    public function run_sync(): void {
        $settings = $this->settings->get_settings();

        if ( empty( $settings['enabled'] ) ) {
            return;
        }

        /**
         * Hook to start a sync cycle. The actual sync implementation will be
         * attached by the sync engine to process outbound and inbound batches.
         */
        do_action( 'site_sync/run_cycle', $settings );
    }
}