<?php
/**
 * WordPress Site Health summary.
 *
 * @package Keepwatch
 */

namespace Keepwatch\Checks;

defined( 'ABSPATH' ) || exit;

/**
 * Uses the result WordPress stores after running Site Health (weekly cron or when the screen is opened).
 * Heavy Site Health tests are not re-run here.
 */
final class SiteHealthCheck implements Check {

	/**
	 * {@inheritDoc}
	 */
	public function group(): string {
		return 'health';
	}

	/**
	 * {@inheritDoc}
	 */
	public function run(): array {
		return self::evaluate( get_transient( 'health-check-site-status-result' ) );
	}

	/**
	 * Pure evaluation of the stored Site Health counts.
	 *
	 * @param mixed $stored JSON string {"good":n,"recommended":n,"critical":n} or false.
	 * @return Result[]
	 */
	public static function evaluate( $stored ): array {
		$url    = admin_url( 'site-health.php' );
		$counts = is_string( $stored ) ? json_decode( $stored, true ) : null;

		if ( ! is_array( $counts ) ) {
			return array(
				new Result(
					'health.unknown',
					Result::RECOMMENDED,
					__( 'Site Health has not run yet', 'keepwatch' ),
					__( 'Open the Site Health screen once; WordPress then keeps the result up to date weekly.', 'keepwatch' ),
					$url,
					__( 'Open Site Health', 'keepwatch' )
				),
			);
		}

		$critical    = (int) ( $counts['critical'] ?? 0 );
		$recommended = (int) ( $counts['recommended'] ?? 0 );

		if ( $critical > 0 ) {
			return array(
				new Result(
					'health.status',
					Result::CRITICAL,
					/* translators: %d: number of issues */
					sprintf( _n( 'Site Health reports %d critical issue', 'Site Health reports %d critical issues', $critical, 'keepwatch' ), $critical ),
					__( 'Critical issues can affect security or performance.', 'keepwatch' ),
					$url,
					__( 'Open Site Health', 'keepwatch' )
				),
			);
		}

		if ( $recommended > 0 ) {
			return array(
				new Result(
					'health.status',
					Result::RECOMMENDED,
					/* translators: %d: number of improvements */
					sprintf( _n( 'Site Health suggests %d improvement', 'Site Health suggests %d improvements', $recommended, 'keepwatch' ), $recommended ),
					'',
					$url,
					__( 'Open Site Health', 'keepwatch' )
				),
			);
		}

		return array( new Result( 'health.status', Result::GOOD, __( 'Site Health looks good', 'keepwatch' ) ) );
	}
}