<?php
if (!defined('ABSPATH')) exit;

return new class extends ATT_HC_Step {
    public function id(): string { return 'uptime'; }
    public function title(): string { return 'Step 10 — Uptime and Availability'; }
    public function sub_items(): array {
        return [
            'Check uptime monitoring logs if available — note any downtime incidents since the last healthcheck and flag to client if significant',
            'Confirm the site is resolving correctly on both www and non-www',
        ];
    }

    public function autocheck(array $session_state): array {
        $f = [];

        // Known monitoring plugins
        $monitors = [
            'worker/init.php'                                  => 'ManageWP Worker',
            'mainwp-child/mainwp-child.php'                    => 'MainWP Child',
            'jetpack/jetpack.php'                              => 'Jetpack',
            'wp-umbrella/wp-umbrella.php'                      => 'WP Umbrella',
            'uptime-robot/uptime-robot.php'                    => 'UptimeRobot',
        ];
        $detected = [];
        foreach ($monitors as $file => $label) {
            if (function_exists('is_plugin_active') && is_plugin_active($file)) $detected[] = $label;
        }
        $f[] = $this->finding(
            'monitor_plugin',
            $detected ? 'ok' : 'info',
            'Monitoring plugin',
            $detected ? implode(', ', $detected) : 'none detected',
            $detected ? 'Pull downtime stats from the relevant dashboard.' : 'External monitoring (UptimeRobot/BetterStack/Pingdom) may still be in place.'
        );

        // www vs non-www: try fetching both and see whether one redirects to the other
        $home = home_url('/');
        $parts = parse_url($home);
        $host  = $parts['host'] ?? '';
        $scheme = $parts['scheme'] ?? 'https';
        if ($host) {
            $with_www    = $scheme . '://' . (strpos($host, 'www.') === 0 ? $host : 'www.' . $host) . '/';
            $without_www = $scheme . '://' . preg_replace('/^www\./', '', $host) . '/';
            foreach (['with www' => $with_www, 'without www' => $without_www] as $label => $url) {
                $resp = wp_remote_head($url, ['timeout' => 5, 'redirection' => 0]);
                if (is_wp_error($resp)) {
                    $f[] = $this->finding('canonical_' . sanitize_key($label), 'warn', $label, $url, $resp->get_error_message());
                    continue;
                }
                $code = wp_remote_retrieve_response_code($resp);
                $loc  = wp_remote_retrieve_header($resp, 'location');
                $detail = $loc ? '→ ' . $loc : '';
                $f[] = $this->finding('canonical_' . sanitize_key($label), 'info', $label, 'HTTP ' . $code, $detail);
            }
        }

        return $f;
    }
};