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

return new class extends ATT_HC_Step {
    public function id(): string { return 'core'; }
    public function title(): string { return 'Step 3 — WordPress Core Update'; }
    public function sub_items(): array {
        return [
            'Check current version against latest stable release',
            'If an update is available, apply it',
            'After update, load the site front-end and wp-admin and confirm both are functioning',
            'Check the database upgrade prompt — if WordPress prompts to upgrade the database, run it',
            'Note the version you updated from and to',
        ];
    }
    public function watch_outs(): array {
        return [
            'White screen of death post-update, admin redirect loops, missing admin menu items — these usually indicate a theme or plugin conflict with the new core version.',
        ];
    }

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

        // What WordPress itself reports (this can be filtered by WP Downgrade etc.)
        if (!function_exists('get_core_updates')) require_once ABSPATH . 'wp-admin/includes/update.php';
        $updates = function_exists('get_core_updates') ? get_core_updates(['dismissed' => true]) : [];
        $wp_reported_latest = (!empty($updates) && !empty($updates[0]->current)) ? $updates[0]->current : $wp_version;

        // Direct query to wp.org — can't be cloaked by site-side filters.
        $wp_org_latest = $this->wp_org_core_version();

        // Detect known plugins that hide/manipulate version reporting.
        $cloakers = $this->detect_cloakers();

        $f[] = $this->finding('wp_current', 'info', 'Currently installed', $wp_version, '');

        // What WP reports as the latest
        $wp_behind = version_compare($wp_version, $wp_reported_latest, '<');
        $f[] = $this->finding(
            'wp_reported_latest',
            $wp_behind ? 'warn' : 'ok',
            'Latest per WordPress',
            $wp_reported_latest,
            'This is what core/get_core_updates() returns — may be filtered by plugins like WP Downgrade.'
        );

        // What wp.org actually thinks
        if ($wp_org_latest === null) {
            $f[] = $this->finding('wp_org_latest', 'info', 'Latest per wp.org', 'could not fetch', 'Direct API call failed — re-run when online.');
        } else {
            $actual_behind = version_compare($wp_version, $wp_org_latest, '<');
            $hidden_gap   = version_compare($wp_reported_latest, $wp_org_latest, '<');
            $level = $hidden_gap ? 'bad' : ($actual_behind ? 'warn' : 'ok');
            $detail = '';
            if ($hidden_gap) {
                $detail = 'CLOAKED — WordPress says latest is ' . $wp_reported_latest . ' but wp.org reports ' . $wp_org_latest . '. Updates likely blocked by a plugin or constant.';
            } elseif ($actual_behind) {
                $detail = 'Real update available → ' . admin_url('update-core.php');
            } else {
                $detail = 'Up to date against the public WP.org API.';
            }
            $f[] = $this->finding('wp_org_latest', $level, 'Latest per wp.org (direct)', $wp_org_latest, $detail);
        }

        // Flag cloaker plugins explicitly
        if ($cloakers) {
            $f[] = $this->finding(
                'cloakers',
                'warn',
                'Update-cloaker plugins active',
                implode(', ', $cloakers),
                'These plugins can hide or block core/plugin updates. Confirm with the client whether they\'re needed before disabling them.'
            );
        }

        // WP Downgrade specifically pins a target via an option — surface its value
        $wpd_target = get_option('wp_downgrade_core_version', '');
        if ($wpd_target) {
            $f[] = $this->finding(
                'wp_downgrade_target',
                'warn',
                'WP Downgrade target',
                (string) $wpd_target,
                'WordPress core is pinned to this version by WP Downgrade. Set wp_downgrade_core_version to empty to release the pin.'
            );
        }

        // Database upgrade required?
        if (function_exists('wp_get_db_schema')) {
            $required = (int) get_option('db_version');
            global $wp_db_version;
            if ($required > 0 && $wp_db_version > $required) {
                $f[] = $this->finding('db_upgrade', 'warn', 'Database upgrade', 'pending', 'WP code is at v' . $wp_db_version . ', database at v' . $required . '. Visit /wp-admin/upgrade.php.');
            } else {
                $f[] = $this->finding('db_upgrade', 'ok', 'Database upgrade', 'not needed', '');
            }
        }

        // Auto-updates configured?
        $core_auto = get_site_option('auto_update_core_major', null);
        if ($core_auto === null) $core_auto = defined('WP_AUTO_UPDATE_CORE') ? (string) WP_AUTO_UPDATE_CORE : 'minor';
        $f[] = $this->finding(
            'auto_update',
            'info',
            'Core auto-update policy',
            (string) $core_auto,
            'Configured via Updates → Auto-updates or the WP_AUTO_UPDATE_CORE constant.'
        );

        // Safe-mode update guidance — not an action, just a reminder.
        $real_behind = $wp_org_latest !== null && version_compare($wp_version, $wp_org_latest, '<');
        if ($real_behind || $wp_behind) {
            $f[] = $this->finding(
                'safe_mode_hint',
                'info',
                'Safe-update sequence',
                'see detail',
                'Deactivate non-essential plugins → run the update → smoke-load front-end + wp-admin → reactivate plugins.'
            );
        }

        return $f;
    }

    /** Direct call to wp.org's version-check endpoint. Cached 1h via transient. */
    private function wp_org_core_version(): ?string {
        $cached = get_transient('att_hc_wp_org_core_latest');
        if ($cached !== false) return $cached === '' ? null : (string) $cached;
        $resp = wp_remote_get('https://api.wordpress.org/core/version-check/1.7/', ['timeout' => 5]);
        if (is_wp_error($resp) || (int) wp_remote_retrieve_response_code($resp) !== 200) {
            set_transient('att_hc_wp_org_core_latest', '', 5 * MINUTE_IN_SECONDS);
            return null;
        }
        $data = json_decode((string) wp_remote_retrieve_body($resp), true);
        $latest = isset($data['offers'][0]['version']) ? (string) $data['offers'][0]['version'] : null;
        set_transient('att_hc_wp_org_core_latest', $latest ?: '', HOUR_IN_SECONDS);
        return $latest;
    }

    /** Detect plugins that are known to hide or manipulate version reporting. */
    private function detect_cloakers(): array {
        if (!function_exists('is_plugin_active')) require_once ABSPATH . 'wp-admin/includes/plugin.php';
        $known = [
            'wp-downgrade/wp-downgrade.php'                  => 'WP Downgrade',
            'wp-rollback/wp-rollback.php'                    => 'WP Rollback',
            'easy-updates-manager/wpmudev_install.php'       => 'Easy Updates Manager',
            'stops-core-theme-and-plugin-updates/stops-core-theme-and-plugin-updates.php' => 'Stops Core/Theme/Plugin Updates',
            'disable-updates-manager/disable-updates-manager.php' => 'Disable Updates Manager',
            'companion-auto-update/companion-auto-update.php' => 'Companion Auto Update',
        ];
        $found = [];
        foreach ($known as $file => $label) {
            if (is_plugin_active($file)) $found[] = $label;
        }
        return $found;
    }
};