<?php
/**
 * Recent PHP fatal errors.
 *
 * @package Keepwatch
 */

namespace Keepwatch\Checks;

use Keepwatch\Errors\ErrorStore;

defined( 'ABSPATH' ) || exit;

/**
 * Critical when a fatal error happened in the last 24 hours, recommended within 7 days.
 */
final class FatalErrorsCheck implements Check {

	/**
	 * Error store.
	 *
	 * @var ErrorStore
	 */
	private $store;

	/**
	 * Constructor.
	 *
	 * @param ErrorStore $store Error store.
	 */
	public function __construct( ErrorStore $store ) {
		$this->store = $store;
	}

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

	/**
	 * {@inheritDoc}
	 */
	public function run(): array {
		$now  = time();
		$day  = $this->total( $this->store->since( $now - DAY_IN_SECONDS ) );
		$week = $this->total( $this->store->since( $now - WEEK_IN_SECONDS ) );
		$url  = admin_url( 'tools.php?page=keepwatch#errors' );

		if ( $day > 0 ) {
			return array(
				new Result(
					'errors.fatal',
					Result::CRITICAL,
					/* translators: %d: number of fatal errors */
					sprintf( _n( '%d PHP fatal error in the last 24 hours', '%d PHP fatal errors in the last 24 hours', $day, 'keepwatch' ), $day ),
					__( 'A fatal error stops the page from loading for the visitor who triggered it. Check the error list below to see which plugin or theme caused it.', 'keepwatch' ),
					$url,
					__( 'View errors', 'keepwatch' )
				),
			);
		}

		if ( $week > 0 ) {
			return array(
				new Result(
					'errors.fatal',
					Result::RECOMMENDED,
					/* translators: %d: number of fatal errors */
					sprintf( _n( '%d PHP fatal error in the last 7 days', '%d PHP fatal errors in the last 7 days', $week, 'keepwatch' ), $week ),
					__( 'No new fatal errors in the last 24 hours. Review the list to make sure the cause has been fixed.', 'keepwatch' ),
					$url,
					__( 'View errors', 'keepwatch' )
				),
			);
		}

		return array(
			new Result(
				'errors.fatal',
				Result::GOOD,
				__( 'No PHP fatal errors in the last 7 days', 'keepwatch' )
			),
		);
	}

	/**
	 * Sum occurrences.
	 *
	 * @param array<string, array{count: int}> $errors Errors.
	 */
	private function total( array $errors ): int {
		$total = 0;
		foreach ( $errors as $error ) {
			$total += (int) $error['count'];
		}
		return $total;
	}
}