<?php
/*
Plugin Name: Ageroth Site Health
Plugin URI: https://ageroth.com/plugins/index.php
Description: Read-only WordPress health checks, cache intelligence, frontend cache validation, and server diagnostics.
Version: 2.3.1
Requires at least: 6.0
Requires PHP: 7.4
Author: Ageroth
Author URI: https://ageroth.com
License: GPL-2.0-or-later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: ageroth-site-health
*/
if (!defined('ABSPATH')) exit;

define('AGEROTH_SH_VERSION', '2.3.1');
define('AGEROTH_SH_OPTION_SETTINGS', 'ageroth_sh_settings');
define('AGEROTH_SH_OPTION_FEEDBACK', 'ageroth_sh_feedback');
define('AGEROTH_SH_OPTION_ALERT_STATE', 'ageroth_sh_alert_state');
define('AGEROTH_SH_CRON_HOOK', 'ageroth_sh_daily_alert_check');
define('AGEROTH_SH_WEEKLY_CRON_HOOK', 'ageroth_sh_weekly_health_report');
define('AGEROTH_SH_URL', plugin_dir_url(__FILE__));

function ageroth_sh_get_settings() {
    $defaults = array(
        'test_url' => '',
        'compare_url' => '',
        'email_alerts_enabled' => '0',
        'alert_email' => get_option('admin_email'),
        'alert_score_threshold' => 75,
        'alert_cache_threshold' => 60,
        'alert_when_page_cache_missing' => '1',
        'alert_when_object_cache_missing' => '0',
        'alert_frequency' => 'daily',
        'weekly_report_enabled' => '0',
    );
    $saved = get_option(AGEROTH_SH_OPTION_SETTINGS, array());
    return wp_parse_args(is_array($saved) ? $saved : array(), $defaults);
}
function ageroth_sh_confidence_label($c){$c=(int)$c; if($c>=65)return'High'; if($c>=25)return'Medium'; return'Low';}
function ageroth_sh_human_ms($seconds){return round(((float)$seconds)*1000).' ms';}
function ageroth_sh_timing_signal_label($s){if($s==='strong')return'Strong'; if($s==='weak')return'Moderate'; return'Too Fast to Judge';}
function ageroth_sh_timing_interpretation($s){if($s==='strong') return 'Strong timing hint'; if($s==='weak') return 'Moderate timing hint'; return 'Too fast to judge';}
function ageroth_sh_is_plugin_active_slug($slug){if(!function_exists('is_plugin_active')) require_once ABSPATH.'wp-admin/includes/plugin.php'; return function_exists('is_plugin_active') && is_plugin_active($slug);}

function ageroth_sh_sanitize_settings($input){
    $output = array();
    $input = is_array($input) ? $input : array();

    $output['test_url'] = isset($input['test_url']) ? sanitize_text_field(wp_unslash($input['test_url'])) : '';
    $output['compare_url'] = isset($input['compare_url']) ? sanitize_text_field(wp_unslash($input['compare_url'])) : '';

    $output['email_alerts_enabled'] = !empty($input['email_alerts_enabled']) ? '1' : '0';

    $email = isset($input['alert_email']) ? sanitize_email(wp_unslash($input['alert_email'])) : '';
    $output['alert_email'] = is_email($email) ? $email : get_option('admin_email');

    $score_threshold = isset($input['alert_score_threshold']) ? absint($input['alert_score_threshold']) : 75;
    $cache_threshold = isset($input['alert_cache_threshold']) ? absint($input['alert_cache_threshold']) : 60;
    $output['alert_score_threshold'] = max(1, min(100, $score_threshold));
    $output['alert_cache_threshold'] = max(1, min(100, $cache_threshold));

    $output['alert_when_page_cache_missing'] = !empty($input['alert_when_page_cache_missing']) ? '1' : '0';
    $output['alert_when_object_cache_missing'] = !empty($input['alert_when_object_cache_missing']) ? '1' : '0';

    $allowed_frequency = array('daily', 'weekly', 'changes_only');
    $frequency = isset($input['alert_frequency']) ? sanitize_key(wp_unslash($input['alert_frequency'])) : 'daily';
    $output['alert_frequency'] = in_array($frequency, $allowed_frequency, true) ? $frequency : 'daily';
    $output['weekly_report_enabled'] = !empty($input['weekly_report_enabled']) ? '1' : '0';

    return $output;
}

function ageroth_sh_normalize_url($value){$value=trim((string)$value); if($value==='') return home_url('/'); if(preg_match('#^https?://#i',$value)) return esc_url_raw($value); return home_url('/' . ltrim($value, '/'));}

add_action('admin_menu', function(){
    add_menu_page('Ageroth Site Health','Site Health+','manage_options','ageroth-site-health','ageroth_sh_render_dashboard','dashicons-heart',58);
    add_submenu_page('ageroth-site-health','Ageroth Site Health','Dashboard','manage_options','ageroth-site-health','ageroth_sh_render_dashboard');
    add_submenu_page('ageroth-site-health','Ageroth Site Health Settings','Settings','manage_options','ageroth-site-health-settings','ageroth_sh_render_settings');
});
add_action('admin_enqueue_scripts', function($hook){
    if (strpos((string)$hook,'ageroth-site-health')===false) return;
    wp_enqueue_style('ageroth-sh-admin', AGEROTH_SH_URL.'assets/admin.css', [], AGEROTH_SH_VERSION);
});
add_filter('plugin_action_links_' . plugin_basename(__FILE__), function($links){
    $custom = [
        '<a href="'.esc_url(admin_url('admin.php?page=ageroth-site-health')).'">Dashboard</a>',
        '<a href="'.esc_url(admin_url('admin.php?page=ageroth-site-health-settings')).'">Settings</a>',
    ];
    return array_merge($custom, $links);
});
add_action('admin_init', function(){
    register_setting('ageroth_sh_settings_group', AGEROTH_SH_OPTION_SETTINGS, array('sanitize_callback' => 'ageroth_sh_sanitize_settings'));
    if (!current_user_can('manage_options')) return;

    if (!empty($_POST['ageroth_sh_run_test']) && check_admin_referer('ageroth_sh_run_test')) {
        $settings = ageroth_sh_get_settings();
        $settings['test_url'] = sanitize_text_field(wp_unslash($_POST['test_url'] ?? ''));
        $settings['compare_url'] = sanitize_text_field(wp_unslash($_POST['compare_url'] ?? ''));
        update_option(AGEROTH_SH_OPTION_SETTINGS, $settings, false);
        wp_safe_redirect(admin_url('admin.php?page=ageroth-site-health'));
        exit;
    }
    if (!empty($_POST['ageroth_sh_use_homepage']) && check_admin_referer('ageroth_sh_use_homepage')) {
        $settings = ageroth_sh_get_settings();
        $settings['test_url'] = '';
        update_option(AGEROTH_SH_OPTION_SETTINGS, $settings, false);
        wp_safe_redirect(admin_url('admin.php?page=ageroth-site-health'));
        exit;
    }
    if (!empty($_POST['ageroth_sh_send_test_alert']) && check_admin_referer('ageroth_sh_send_test_alert')) {
        ageroth_sh_run_email_alert_check(true);
        wp_safe_redirect(admin_url('admin.php?page=ageroth-site-health-settings&ageroth_sh_test_alert=sent'));
        exit;
    }

    if (!empty($_POST['ageroth_sh_send_weekly_report_now']) && check_admin_referer('ageroth_sh_send_weekly_report_now')) {
        ageroth_sh_send_weekly_health_report(true);
        wp_safe_redirect(admin_url('admin.php?page=ageroth-site-health-settings&ageroth_sh_weekly_report=sent'));
        exit;
    }

    if (!empty($_POST['ageroth_sh_save_feedback']) && check_admin_referer('ageroth_sh_save_feedback')) {
        $msg = sanitize_textarea_field(wp_unslash($_POST['ageroth_sh_feedback'] ?? ''));
        if ($msg !== '') {
            $items = get_option(AGEROTH_SH_OPTION_FEEDBACK, []);
            if (!is_array($items)) $items = [];
            array_unshift($items, ['message'=>$msg,'created_at'=>current_time('mysql')]);
            $items = array_slice($items, 0, 8);
            update_option(AGEROTH_SH_OPTION_FEEDBACK, $items, false);
        }
        wp_safe_redirect(admin_url('admin.php?page=ageroth-site-health'));
        exit;
    }
});


register_activation_hook(__FILE__, 'ageroth_sh_activate_alert_cron');
register_deactivation_hook(__FILE__, 'ageroth_sh_deactivate_alert_cron');

function ageroth_sh_activate_alert_cron() {
    if (!wp_next_scheduled(AGEROTH_SH_CRON_HOOK)) {
        wp_schedule_event(time() + HOUR_IN_SECONDS, 'daily', AGEROTH_SH_CRON_HOOK);
        wp_schedule_event(time() + DAY_IN_SECONDS, 'weekly', AGEROTH_SH_WEEKLY_CRON_HOOK);
    }
}

function ageroth_sh_deactivate_alert_cron() {
    $timestamp = wp_next_scheduled(AGEROTH_SH_CRON_HOOK);
    if ($timestamp) {
        wp_unschedule_event($timestamp, AGEROTH_SH_CRON_HOOK);
        $weekly_timestamp = wp_next_scheduled(AGEROTH_SH_WEEKLY_CRON_HOOK);
        if ($weekly_timestamp) { wp_unschedule_event($weekly_timestamp, AGEROTH_SH_WEEKLY_CRON_HOOK); }
    }
}

add_filter('cron_schedules', 'ageroth_sh_cron_schedules');
function ageroth_sh_cron_schedules($schedules) {
    if (!isset($schedules['weekly'])) {
        $schedules['weekly'] = array('interval' => WEEK_IN_SECONDS, 'display' => 'Once Weekly');
    }
    return $schedules;
}
add_action(AGEROTH_SH_CRON_HOOK, 'ageroth_sh_run_email_alert_check');
add_action(AGEROTH_SH_WEEKLY_CRON_HOOK, 'ageroth_sh_send_weekly_health_report');

function ageroth_sh_alert_state() {
    $state = get_option(AGEROTH_SH_OPTION_ALERT_STATE, array());
    return is_array($state) ? $state : array();
}

function ageroth_sh_update_alert_state($state) {
    update_option(AGEROTH_SH_OPTION_ALERT_STATE, is_array($state) ? $state : array(), false);
}

function ageroth_sh_run_email_alert_check($force_send = false) {
    $settings = ageroth_sh_get_settings();

    if (empty($settings['email_alerts_enabled']) && !$force_send) {
        return false;
    }

    $email = isset($settings['alert_email']) ? $settings['alert_email'] : '';
    if (!is_email($email)) {
        return false;
    }

    $report = ageroth_sh_build_report();
    $issues = ageroth_sh_get_alert_issues($report, $settings);

    if (empty($issues) && !$force_send) {
        ageroth_sh_update_alert_state(array(
            'last_checked' => current_time('mysql'),
            'last_status' => 'healthy',
            'last_issues_hash' => '',
        ));
        return false;
    }

    if ($force_send && empty($issues)) {
        $issues[] = 'Test alert: no critical health issues were detected at this time.';
    }

    $issues_hash = md5(wp_json_encode($issues));
    $state = ageroth_sh_alert_state();
    $frequency = isset($settings['alert_frequency']) ? $settings['alert_frequency'] : 'daily';
    $last_sent = isset($state['last_sent_time']) ? absint($state['last_sent_time']) : 0;
    $last_hash = isset($state['last_issues_hash']) ? (string) $state['last_issues_hash'] : '';

    if (!$force_send) {
        if ($frequency === 'changes_only' && $last_hash === $issues_hash) {
            return false;
        }

        if ($frequency === 'daily' && $last_sent > 0 && (time() - $last_sent) < DAY_IN_SECONDS && $last_hash === $issues_hash) {
            return false;
        }

        if ($frequency === 'weekly' && $last_sent > 0 && (time() - $last_sent) < WEEK_IN_SECONDS && $last_hash === $issues_hash) {
            return false;
        }
    }

    $subject = sprintf('[%s] Ageroth Site Health Alert', wp_specialchars_decode(get_bloginfo('name'), ENT_QUOTES));
    $body = ageroth_sh_build_alert_email_body($report, $issues);

    $sent = wp_mail($email, $subject, $body);

    $state = array(
        'last_checked' => current_time('mysql'),
        'last_sent' => $sent ? current_time('mysql') : '',
        'last_sent_time' => $sent ? time() : $last_sent,
        'last_status' => $sent ? 'sent' : 'failed',
        'last_issues_hash' => $issues_hash,
        'last_issues' => $issues,
    );
    ageroth_sh_update_alert_state($state);

    return $sent;
}

function ageroth_sh_get_alert_issues($report, $settings) {
    $issues = array();
    $score = isset($report['score']) ? absint($report['score']) : 0;
    $score_threshold = isset($settings['alert_score_threshold']) ? absint($settings['alert_score_threshold']) : 75;

    if ($score > 0 && $score < $score_threshold) {
        $issues[] = sprintf('Overall health score is %d, below your alert threshold of %d.', $score, $score_threshold);
    }

    $cache_score = isset($report['score_breakdown']['Caching']) ? absint($report['score_breakdown']['Caching']) : 0;
    $cache_threshold = isset($settings['alert_cache_threshold']) ? absint($settings['alert_cache_threshold']) : 60;

    if ($cache_score > 0 && $cache_score < $cache_threshold) {
        $issues[] = sprintf('Caching score is %d, below your alert threshold of %d.', $cache_score, $cache_threshold);
    }

    if (!empty($settings['alert_when_page_cache_missing']) && isset($report['primary_page_cache']) && $report['primary_page_cache'] === 'None detected') {
        $issues[] = 'Primary page cache is no longer detected.';
    }

    if (!empty($settings['alert_when_object_cache_missing']) && isset($report['primary_object_cache']) && $report['primary_object_cache'] === 'None detected') {
        $issues[] = 'Persistent object cache is not detected.';
    }

    return array_values(array_unique($issues));
}

function ageroth_sh_build_alert_email_body($report, $issues) {
    $lines = array();
    $lines[] = 'Ageroth Site Health detected a change or issue that matches your alert settings.';
    $lines[] = '';
    $lines[] = 'Site: ' . home_url('/');
    $lines[] = 'Overall Score: ' . (isset($report['score']) ? $report['score'] : 'Unknown');
    $lines[] = 'Page Cache: ' . (isset($report['primary_page_cache']) ? $report['primary_page_cache'] : 'Unknown');
    $lines[] = 'Object Cache: ' . (isset($report['primary_object_cache']) ? $report['primary_object_cache'] : 'Unknown');
    $lines[] = 'Generated: ' . (isset($report['generated_at']) ? $report['generated_at'] : current_time('mysql'));
    $lines[] = '';
    $lines[] = 'Issues:';

    foreach ($issues as $issue) {
        $lines[] = '- ' . $issue;
    }

    if (!empty($report['recommendations'])) {
        $lines[] = '';
        $lines[] = 'Recommendations:';
        foreach ($report['recommendations'] as $recommendation) {
            $lines[] = '- ' . $recommendation;
        }
    }

    $lines[] = '';
    $lines[] = 'Open WordPress admin to review the full report.';
    $lines[] = 'This email was generated locally by the Ageroth Site Health plugin. No data was sent to external services.';

    return implode("\n", $lines);
}


function ageroth_sh_detect_page_cache() {
    $map = [
        'wp-fastest-cache/wpFastestCache.php'=>'WP Fastest Cache',
        'litespeed-cache/litespeed-cache.php'=>'LiteSpeed Cache',
        'wp-rocket/wp-rocket.php'=>'WP Rocket',
        'w3-total-cache/w3-total-cache.php'=>'W3 Total Cache',
        'wp-super-cache/wp-cache.php'=>'WP Super Cache',
        'sg-cachepress/sg-cachepress.php'=>'SiteGround Optimizer',
        'breeze/breeze.php'=>'Breeze',
        'cache-enabler/cache-enabler.php'=>'Cache Enabler',
        'hummingbird-performance/wp-hummingbird.php'=>'Hummingbird',
        'swift-performance-lite/performance.php'=>'Swift Performance',
        'flying-press/flying-press.php'=>'FlyingPress',
        'wp-optimize/wp-optimize.php'=>'WP-Optimize',
        'autoptimize/autoptimize.php'=>'Autoptimize'
    ];
    $signals=[]; $primary='None detected';
    foreach($map as $slug=>$name){ if(ageroth_sh_is_plugin_active_slug($slug)){ $primary=$name; $signals[]='Active plugin: '.$name; break; } }
    if(defined('WP_CACHE') && WP_CACHE){ $signals[]='WP_CACHE'; if($primary==='None detected') $primary='Unknown / signal only'; }
    if(file_exists(WP_CONTENT_DIR.'/advanced-cache.php')){ $signals[]='advanced-cache.php'; if($primary==='None detected') $primary='Unknown / signal only'; }
    foreach([WP_CONTENT_DIR.'/cache', WP_CONTENT_DIR.'/wpfc-cache', WP_CONTENT_DIR.'/cache/page_enhanced'] as $folder){ if(is_dir($folder)) $signals[]='Cache dir: '.basename($folder); }
    if(empty($signals)) $signals[]='No cache signal found';
    return ['primary'=>$primary,'signals'=>array_values(array_unique($signals))];
}
function ageroth_sh_detect_object_cache() {
    $map=['redis-cache/redis-cache.php'=>'Redis Object Cache','object-cache-pro/object-cache-pro.php'=>'Object Cache Pro','memcached/memcached.php'=>'Memcached','docket-cache/docket-cache.php'=>'Docket Cache','litespeed-cache/litespeed-cache.php'=>'Not detected'];
    $signals=[]; $primary='None detected';
    foreach($map as $slug=>$name){ if(ageroth_sh_is_plugin_active_slug($slug)){ $primary=$name; $signals[]='Active plugin: '.$name; break; } }
    if(function_exists('wp_using_ext_object_cache') && wp_using_ext_object_cache()){ $signals[]='wp_using_ext_object_cache()'; if($primary==='None detected') $primary='Unknown / signal only'; }
    if(file_exists(WP_CONTENT_DIR.'/object-cache.php')){ $signals[]='object-cache.php'; if($primary==='None detected') $primary='Unknown / signal only'; }
    if(empty($signals)) $signals[]='No object cache signal found';
    return ['primary'=>$primary,'signals'=>array_values(array_unique($signals))];
}
function ageroth_sh_extract_markers($body){
    $body = strtolower((string)$body); $markers=[];
    $map=['wp fastest cache'=>'HTML marker: WP Fastest Cache','wpfc-minified'=>'HTML marker: WP Fastest Cache','wp rocket'=>'HTML marker: WP Rocket','litespeed-cache'=>'HTML marker: LiteSpeed Cache','w3 total cache'=>'HTML marker: W3 Total Cache'];
    foreach($map as $needle=>$label){ if(strpos($body,$needle)!==false) $markers[]=$label; }
    return array_values(array_unique($markers));
}
function ageroth_sh_classify_hit($hit){
    $low = strtolower((string)$hit);
    foreach(['x-litespeed-cache: hit','cf-cache-status: hit','x-cache: hit','x-cache-status: hit','x-fastcgi-cache: hit','x-proxy-cache: hit','x-wp-cf-super-cache-cache: cache','x-kinsta-cache: hit'] as $pattern){ if(strpos($low,$pattern)!==false) return 'positive'; }
    if(preg_match('/^age:\s*[1-9][0-9]*/',$low)) return 'positive';
    foreach(['cf-cache-status: bypass','cf-cache-status: dynamic','cf-cache-status: miss','x-litespeed-cache: miss','x-cache: miss','x-cache-status: miss','x-fastcgi-cache: miss','x-proxy-cache: miss','private'] as $pattern){ if(strpos($low,$pattern)!==false) return 'negative'; }
    if(strpos($low,'cache-control:')!==false && (strpos($low,'no-cache')!==false || strpos($low,'no-store')!==false || strpos($low,'must-revalidate')!==false)) return 'neutral-cache';
    foreach(['html marker:','x-litespeed-cache:','cf-cache-status:','x-cache:','x-cache-status:','x-fastcgi-cache:','x-proxy-cache:','x-wp-cf-super-cache-cache:','x-kinsta-cache:','age:'] as $pattern){ if(strpos($low,$pattern)!==false) return 'neutral-cache'; }
    return 'generic';
}
function ageroth_sh_run_frontend_test($url, $page_cache) {
    $requests=[$url,$url]; $request_times=[]; $all_hits=[]; $final_status=0; $server_header="";
    foreach($requests as $i=>$request_url){
        $start=microtime(true);
        $response=wp_remote_get($request_url,['timeout'=>8,'redirection'=>3,'sslverify'=>false,'user-agent'=>'Ageroth-Site-Health/'.AGEROTH_SH_VERSION,'headers'=>['Accept'=>'text/html,application/xhtml+xml']]);
        $elapsed=max(0,microtime(true)-$start);
        if(is_wp_error($response)){
            return ['status'=>'warning','status_label'=>'Request Failed','summary'=>'The live frontend request failed before cache headers could be evaluated.','positive_hits'=>[],'negative_hits'=>[],'neutral_hits'=>[],'headers'=>[],'confidence'=>0,'tested_url'=>$url,'http_status'=>0,'diagnostics'=>['Cache Plugin'=>$page_cache['primary'] !== 'None detected' ? $page_cache['primary'] : 'Not detected','Live HIT Header'=>'Not detected','Response Type'=>'Unavailable'],'recommendation'=>'The test request failed. Try again or test a different public URL.','response_type'=>'Unavailable','explanation'=>'The live request failed before cache signals could be evaluated.','what_it_means'=>'The plugin could not complete the live request, so this report cannot confirm how the tested page behaves.','next_steps'=>['Run the test again.','Try a different public URL.','Check that the site can be reached from the server.'],'request_times'=>[],'double_request_summary'=>'No timing data available.','timing_signal'=>'inconclusive','timing_explanation'=>'Timing data was not available for this test.','why_uncached'=>[$response->get_error_message()]];
        }
        $final_status=(int)wp_remote_retrieve_response_code($response);
        $headers=wp_remote_retrieve_headers($response);
        $body=(string)wp_remote_retrieve_body($response);
        $headers_array=[];
        if(is_object($headers) && method_exists($headers,'getAll')) $headers_array=(array)$headers->getAll();
        elseif(is_array($headers)) $headers_array=$headers;
        $all_hits[]='HTTP '.$final_status;
        foreach((array)$headers_array as $name=>$value){
            $name=strtolower((string)$name);
            if(is_array($value)) $value=implode(', ', array_map('strval',$value));
            $value=trim(preg_replace('/\s+/',' ',(string)$value));
            if($value==='') continue;
            if($name==='server') $server_header=$value; if(in_array($name,['cache-control','age','x-cache','x-cache-status','x-litespeed-cache','x-fastcgi-cache','x-proxy-cache','cf-cache-status','x-wp-cf-super-cache-cache','x-kinsta-cache','server'],true)) $all_hits[]=$name.': '.$value;
        }
        foreach(ageroth_sh_extract_markers($body) as $marker) $all_hits[]=$marker;
        $request_times[]=['request'=>$i+1,'duration'=>$elapsed];
    }
    $all_hits=array_values(array_unique($all_hits));
    $positive_hits=[]; $negative_hits=[]; $neutral_hits=[]; $confidence=0;
    foreach($all_hits as $hit){
        $type=ageroth_sh_classify_hit($hit);
        if($type==='positive'){ $positive_hits[]=$hit; $confidence+=40; }
        elseif($type==='negative'){ $negative_hits[]=$hit; $confidence-=15; }
        elseif($type==='neutral-cache'){ $neutral_hits[]=$hit; $confidence+=10; }
    }
    $confidence=max(0,min(100,$confidence));
    $has_strong_positive=!empty($positive_hits);
    $has_marker=false; foreach($all_hits as $hit){ if(stripos($hit,'HTML marker:')!==false) $has_marker=true; }
    $has_page_cache_locally=$page_cache['primary']!=='None detected';

    $timing_signal='inconclusive'; $timing_explanation='Timing data was not available for this test.'; $double_request_summary='Double-request timing was not available.'; $likely_cached=false;
    if(count($request_times)>=2){
        $first=(float)$request_times[0]['duration']; $second=(float)$request_times[1]['duration'];
        $double_request_summary=sprintf('Request 1: %s • Request 2: %s', ageroth_sh_human_ms($first), ageroth_sh_human_ms($second));
        if($second < $first*0.70 && ($first-$second)>0.08){ $timing_signal='strong'; $timing_explanation='The second request was significantly faster, which is a strong timing hint for cached delivery.'; $double_request_summary.=' • The second request was significantly faster.'; $likely_cached=true; $confidence=max($confidence,55); }
        elseif($second < $first*0.85 && ($first-$second)>0.04){ $timing_signal='weak'; $timing_explanation='The second request was moderately faster, which may suggest a cache warmup effect.'; $double_request_summary.=' • The second request was moderately faster.'; $likely_cached=true; $confidence=max($confidence,35); }
        else { $timing_signal='inconclusive'; $timing_explanation='Both requests were already very fast, so timing alone could not confirm a cache warmup effect.'; $double_request_summary.=' • The second request was not meaningfully faster.'; }
    }

    $result=['status'=>'neutral','status_label'=>'Page Cache Detected','summary'=>'A page cache layer appears to be active, but this response does not expose an explicit cache-hit header.','positive_hits'=>$positive_hits,'negative_hits'=>$negative_hits,'neutral_hits'=>$neutral_hits,'headers'=>array_slice($all_hits,0,10),'confidence'=>max(0,min(100,$confidence)),'tested_url'=>$url,'http_status'=>$final_status,'diagnostics'=>[],'recommendation'=>'Page cache is detected, but no explicit hit header is exposed on this response.','response_type'=>'Cache detected (no explicit HIT header)','explanation'=>'This is common on some cache plugins and does not necessarily mean caching is not working.','what_it_means'=>'Caching appears to be active on this site. However, the tested response did not include a direct HIT header, which is common on some cache plugins and server setups.','next_steps'=>['Test another public URL.','Try again after clearing cache.','Some pages may expose cache signals more clearly than others.'],'request_times'=>$request_times,'double_request_summary'=>$double_request_summary,'timing_signal'=>$timing_signal,'timing_explanation'=>$timing_explanation,'why_uncached'=>[],'server_header'=>$server_header];

    if($has_strong_positive){
        $result['status']='good'; $result['status_label']='Confirmed Cache Hit'; $result['summary']='A live request returned a clear cache-hit signal for this URL.'; $result['response_type']='Confirmed cache hit'; $result['explanation']='A live request returned a clear cache-hit signal for this URL.'; $result['what_it_means']='Good news. The tested page returned a clear cache-hit signal, so caching is working for this URL.'; $result['next_steps']=['Test another public URL to compare behavior.','Review object cache separately if needed.','Use this result as a baseline for the site.']; $result['recommendation']='A confirmed live cache hit was detected on this URL.';
    } elseif(($has_marker || $has_page_cache_locally) && $likely_cached){
        $result['status']='good'; $result['status_label']='Likely Cached (Double Request)'; $result['summary']='The second request was meaningfully faster, which suggests this URL is probably being served from cache.'; $result['response_type']='Likely cached (timing hint)'; $result['explanation']='This result is based on timing behavior across two back-to-back requests, even though no explicit HIT header was exposed.'; $result['what_it_means']='Caching appears to be active on this site. The server did not return a direct HIT header, but the second request was faster in a way that suggests cached delivery.'; $result['next_steps']=['Test another public URL to compare the pattern.','Run the test again after clearing cache.','Use Technical Details if you need the raw timing data.']; $result['recommendation']='Double-request timing suggests this URL is probably being served from cache.';
    } elseif(!$has_marker && !$has_page_cache_locally && !empty($negative_hits)){
        $result['status']='warning'; $result['status_label']='Likely Uncached'; $result['summary']='This page response looks dynamic or bypassed rather than served from cache.'; $result['response_type']='Likely uncached'; $result['explanation']='The tested response looks more like a dynamic or bypassed page than a cached response.'; $result['what_it_means']='This response looks more like a dynamic or bypassed page than a cached response. The page may be excluded from cache, or another rule may be affecting it.'; $result['next_steps']=['Check cache exclusions for this page.','Test a simpler public URL.','Review any plugin or theme code that adds restrictive headers.']; $result['recommendation']='This response looks uncached. Test another public URL and review any cache exclusions if needed.';
    }
    foreach($negative_hits as $hit){
        $low=strtolower($hit);
        if(strpos($low,'no-cache')!==false || strpos($low,'no-store')!==false) $result['why_uncached'][]='The response sent restrictive browser cache headers.';
        elseif(strpos($low,'miss')!==false || strpos($low,'bypass')!==false || strpos($low,'dynamic')!==false) $result['why_uncached'][]='The cache layer reported a miss, bypass, or dynamic response.';
        elseif(strpos($low,'private')!==false) $result['why_uncached'][]='The response appears private, which usually prevents a public cache hit.';
    }
    $result['why_uncached']=array_values(array_unique($result['why_uncached']));
    $result['diagnostics']=['Cache Plugin'=>($has_marker || $has_page_cache_locally)?$page_cache['primary']:'Not detected','Live HIT Header'=>$has_strong_positive?'Detected':'Not detected','Response Type'=>$result['response_type']];
    return $result;
}
function ageroth_sh_compare_urls($home_result, $inner_result){ $home = $home_result['status_label'] ?? 'Unknown'; $inner = $inner_result['status_label'] ?? 'Unknown'; if($home === $inner) return ['summary'=>'Homepage and inner-page cache behavior look similar.','severity'=>'same']; return ['summary'=>'Cache behavior differs between the homepage and the comparison URL.','severity'=>'different']; }

function ageroth_sh_server_profile($frontend){
    $server = !empty($frontend['server_header']) ? $frontend['server_header'] : (isset($_SERVER['SERVER_SOFTWARE']) ? sanitize_text_field(wp_unslash($_SERVER['SERVER_SOFTWARE'])) : 'Unknown');
    $opcache = 'Unknown / not exposed';
    if (function_exists('opcache_get_status')) {
        $status = @opcache_get_status(false);
        if (is_array($status) && !empty($status['opcache_enabled'])) { $opcache = 'Enabled'; }
    }
    return [
        'Web Server' => $server,
        'PHP Version' => PHP_VERSION,
        'OPcache' => $opcache,
        'Memory Limit' => defined('WP_MEMORY_LIMIT') ? WP_MEMORY_LIMIT : ini_get('memory_limit'),
        'Max Execution Time' => ini_get('max_execution_time') !== false ? ini_get('max_execution_time').'s' : 'Unknown',
        'Multisite' => is_multisite() ? 'Yes' : 'No'
    ];
}
function ageroth_sh_cache_intelligence($page_cache,$frontend){
    $confidence=(int)($frontend['confidence'] ?? 0);
    $hit=($frontend['status_label'] ?? '')==='Confirmed Cache Hit';
    $takeaway=$hit?'A clear live cache HIT signal was detected.':($page_cache['primary']!=='None detected'?'A cache layer is detected, but this response does not expose a direct HIT header.':'No clear page-cache layer was detected locally.');
    return [
        'Plugin / Layer'=>$page_cache['primary'],
        'Live Result'=>$frontend['status_label'] ?? 'Unknown',
        'Confidence'=>ageroth_sh_confidence_label($confidence).' ('.$confidence.'%)',
        'Timing Signal'=>ageroth_sh_timing_signal_label($frontend['timing_signal'] ?? 'inconclusive'),
        'Takeaway'=>$takeaway
    ];
}
function ageroth_sh_object_cache_intelligence($object_cache){
    return [
        'Object Cache Layer'=>$object_cache['primary'],
        'Drop-in File'=>file_exists(WP_CONTENT_DIR.'/object-cache.php')?'Present':'Not found',
        'WordPress External Object Cache'=>(function_exists('wp_using_ext_object_cache') && wp_using_ext_object_cache())?'Enabled':'Not reported',
        'Recommendation'=>$object_cache['primary']!=='None detected'?'Persistent object cache signals were detected.':'Consider persistent object cache for larger or busier sites.'
    ];
}
function ageroth_sh_wc_intelligence(){
    $active=class_exists('WooCommerce');
    $items=['Status'=>$active?'Active':'Inactive'];
    if($active && function_exists('wc_get_page_id')){
        foreach(['Cart page'=>'cart','Checkout page'=>'checkout','My account page'=>'myaccount'] as $label=>$key){
            $id=wc_get_page_id($key); $items[$label]=($id && $id>0)?get_permalink($id):'Not configured';
        }
        $items['Cache note']='Cart, checkout, and account pages should normally stay excluded from full-page cache.';
    } else {
        $items['Cache note']='WooCommerce is not active on this site.';
    }
    return $items;
}
function ageroth_sh_render_kv_grid($items){
    foreach((array)$items as $label=>$value){
        echo '<div class="ageroth-sh-kv"><span>'.esc_html($label).'</span><strong>'.esc_html(is_scalar($value)?(string)$value:wp_json_encode($value)).'</strong></div>';
    }
}

function ageroth_sh_build_report() {
    $settings = ageroth_sh_get_settings();
    $test_url = !empty($settings['test_url']) ? ageroth_sh_normalize_url($settings['test_url']) : home_url('/');
    $compare_url = !empty($settings['compare_url']) ? ageroth_sh_normalize_url($settings['compare_url']) : '';
    $cache_key = 'ageroth_sh_report_' . md5(AGEROTH_SH_VERSION . '|' . $test_url . '|' . $compare_url);
    $cached = get_transient($cache_key); if (is_array($cached)) return $cached;
    global $wp_version;
    $page_cache=ageroth_sh_detect_page_cache(); $object_cache=ageroth_sh_detect_object_cache(); $frontend=ageroth_sh_run_frontend_test($test_url,$page_cache); $comparison = null;
    if($compare_url!==''){ $comparison_result=ageroth_sh_run_frontend_test($compare_url,$page_cache); $comparison_meta = ageroth_sh_compare_urls($frontend,$comparison_result); $comparison=['url'=>$compare_url,'result'=>$comparison_result,'summary'=>$comparison_meta['summary'],'severity'=>$comparison_meta['severity']]; }
    $memory_limit_string = defined('WP_MEMORY_LIMIT') ? WP_MEMORY_LIMIT : ini_get('memory_limit');
    $memory_limit_raw = function_exists('wp_convert_hr_to_bytes') ? wp_convert_hr_to_bytes($memory_limit_string) : 0; $memory_limit_mb = (int) round($memory_limit_raw / 1024 / 1024);
    $php_ok = version_compare(PHP_VERSION,'8.0','>='); $wp_ok = version_compare($wp_version,'6.4','>='); $memory_ok = $memory_limit_mb >= 64; $wc_active = class_exists('WooCommerce'); $wp_debug = defined('WP_DEBUG') && WP_DEBUG; $rest_ok = !empty(rest_get_url_prefix()); $cron_disabled = defined('DISABLE_WP_CRON') && DISABLE_WP_CRON;
    $checks=[
        ['label'=>'PHP Version','value'=>PHP_VERSION,'status'=>$php_ok?'good':'warning','message'=>$php_ok?sprintf('PHP %s looks modern enough for many current setups.', PHP_VERSION):sprintf('PHP %s is older than recommended for a modern WordPress stack.', PHP_VERSION),'points'=>$php_ok?0:12],
        ['label'=>'WordPress Version','value'=>$wp_version,'status'=>$wp_ok?'good':'warning','message'=>$wp_ok?sprintf('WordPress %s looks reasonably up to date.', $wp_version):sprintf('WordPress %s is behind recent stable releases.', $wp_version),'points'=>$wp_ok?0:10],
        ['label'=>'Memory Limit','value'=>$memory_limit_mb > 0 ? $memory_limit_mb . 'M' : $memory_limit_string,'status'=>$memory_ok?'good':'warning','message'=>$memory_ok?'The current memory limit looks reasonable for a typical site.':'This memory limit may be low for heavier plugins or growing sites.','points'=>$memory_ok?0:8],
        ['label'=>'Primary Page Cache','value'=>$page_cache['primary'],'status'=>$page_cache['primary']==='None detected'?'warning':'good','message'=>$page_cache['primary']==='None detected'?'No clear page-cache signal was detected from plugins, constants, or cache folders.':'A page cache layer was detected from the local WordPress setup.','meta'=>implode(' · ', $page_cache['signals']),'points'=>$page_cache['primary']==='None detected'?12:0],
        ['label'=>'Primary Object Cache','value'=>$object_cache['primary'],'status'=>$object_cache['primary']==='None detected'?'warning':'good','message'=>$object_cache['primary']==='None detected'?'No persistent object cache signal was detected.':'A persistent object cache signal was detected.','meta'=>implode(' · ', $object_cache['signals']),'points'=>$object_cache['primary']==='None detected'?4:0],
        ['label'=>'WooCommerce','value'=>$wc_active?'Active':'Inactive','status'=>'neutral','message'=>$wc_active?'WooCommerce is active. Cache behavior can vary more on dynamic shop pages.':'WooCommerce is not active on this site.','points'=>0],
        ['label'=>'WP_DEBUG','value'=>$wp_debug?'Enabled':'Disabled','status'=>$wp_debug?'warning':'good','message'=>$wp_debug?'Debug mode is enabled. That is usually not ideal on production.':'Debug mode appears disabled, which is typical for production.','points'=>$wp_debug?4:0],
        ['label'=>'REST API','value'=>$rest_ok?'Available':'Restricted','status'=>$rest_ok?'good':'neutral','message'=>$rest_ok?'The REST API appears reachable from WordPress.':'The REST API may be restricted by custom rules or security settings.','points'=>0],
        ['label'=>'WP-Cron Mode','value'=>$cron_disabled?'Disabled (system cron expected)':'Enabled','status'=>$cron_disabled?'neutral':'good','message'=>$cron_disabled?'WP-Cron is disabled, so a real system cron should exist.':'WP-Cron appears enabled in the default mode.','points'=>0]
    ];
    $performance_score = ($memory_ok ? 100 : 85);
    $cache_score = min(100, ($page_cache['primary'] !== 'None detected' ? 70 : 30) + (int) ($frontend['confidence'] / 2));
    $server_score = ($php_ok && $memory_ok ? 100 : 85);
    $maintenance_score = ($wp_debug ? 88 : 100);
    $score = (int) round(($performance_score * 0.25) + ($cache_score * 0.35) + ($server_score * 0.20) + ($maintenance_score * 0.20));
    $score = max(0, min(100, $score));
    if($score>=85) $score_summary='This site looks healthy overall. Only smaller improvements may be worth reviewing.'; elseif($score>=70) $score_summary='Your site looks usable, but there are some technical improvements worth addressing.'; elseif($score>=50) $score_summary='This site has a few meaningful health or cache signals worth reviewing.'; else $score_summary='This site likely needs attention before it can be considered technically healthy.';
    $recommendations=[]; if(!$memory_ok) $recommendations[]='Consider increasing the WordPress memory limit if this site grows or uses heavier plugins.'; if($object_cache['primary']==='None detected') $recommendations[]='Consider enabling persistent object cache if this site becomes busier or uses heavier plugins.'; if(!empty($frontend['recommendation'])) $recommendations[]=$frontend['recommendation']; if($comparison && !empty($comparison['summary'])) $recommendations[]=$comparison['summary'];
    $report=['score'=>$score,'summary'=>$score_summary,'generated_at'=>current_time('mysql'),'checks'=>$checks,'recommendations'=>array_values(array_unique(array_filter($recommendations))),'primary_page_cache'=>$page_cache['primary'],'primary_object_cache'=>$object_cache['primary'],'snapshot'=>['Home URL'=>home_url('/'),'PHP'=>PHP_VERSION,'WordPress'=>$wp_version,'Theme'=>wp_get_theme()->get('Name'),'Site Type'=>$wc_active ? 'WooCommerce / store capable' : 'Standard WordPress site','Report Generated'=>current_time('mysql')],'frontend_cache_test'=>$frontend,'comparison'=>$comparison,'cache_intelligence'=>ageroth_sh_cache_intelligence($page_cache,$frontend),'object_cache_intelligence'=>ageroth_sh_object_cache_intelligence($object_cache),'woocommerce_intelligence'=>ageroth_sh_wc_intelligence(),'server_profile'=>ageroth_sh_server_profile($frontend),'score_breakdown'=>['Performance'=>$performance_score,'Caching'=>$cache_score,'Server'=>$server_score,'Maintenance'=>$maintenance_score]];
    set_transient($cache_key,$report,300); return $report;
}
function ageroth_sh_get_score_level($score){ if($score>=85) return'good'; if($score>=60) return'medium'; return'poor'; }

function ageroth_sh_get_recommendation_groups($report) {
    $good = array();
    $consider = array();

    if (!empty($report['checks']) && is_array($report['checks'])) {
        foreach ($report['checks'] as $check) {
            $label = isset($check['label']) ? $check['label'] : '';
            $status = isset($check['status']) ? $check['status'] : '';
            $value = isset($check['value']) ? $check['value'] : '';
            if ($status === 'good') {
                $good[] = trim($label . ($value !== '' ? ': ' . $value : ''));
            } elseif ($status === 'warning') {
                $consider[] = !empty($check['message']) ? $check['message'] : $label;
            }
        }
    }

    if (!empty($report['primary_page_cache']) && $report['primary_page_cache'] !== 'None detected') {
        $good[] = 'Page cache layer detected: ' . $report['primary_page_cache'];
    } else {
        $consider[] = 'Enable a page cache layer to improve response times.';
    }

    if (!empty($report['primary_object_cache']) && $report['primary_object_cache'] !== 'None detected') {
        $good[] = 'Persistent object cache signal detected: ' . $report['primary_object_cache'];
    } else {
        $consider[] = 'No persistent object cache detected. Redis or another object cache can help larger sites.';
    }

    if (!empty($report['frontend_cache_test']['confidence']) && (int) $report['frontend_cache_test']['confidence'] >= 35) {
        $good[] = 'Frontend cache timing produced a useful signal.';
    } else {
        $consider[] = 'No explicit frontend cache HIT header was exposed. This can be normal, but testing another public URL may help.';
    }

    return array(
        'good' => array_values(array_unique(array_slice($good, 0, 8))),
        'consider' => array_values(array_unique(array_slice($consider, 0, 8))),
    );
}

function ageroth_sh_get_cache_intelligence_v2($report) {
    $frontend = isset($report['frontend_cache_test']) ? $report['frontend_cache_test'] : array();
    $headers = isset($frontend['headers']) && is_array($frontend['headers']) ? $frontend['headers'] : array();
    $methods = array();

    if (!empty($report['primary_page_cache']) && $report['primary_page_cache'] !== 'None detected') {
        $methods[] = 'Plugin / local signal';
    }
    foreach ($headers as $header) {
        if (stripos($header, 'x-') !== false || stripos($header, 'cf-cache-status') !== false || stripos($header, 'age:') !== false) {
            $methods[] = 'Response header';
            break;
        }
    }
    if (!empty($frontend['neutral_hits'])) {
        $methods[] = 'HTML / weak cache marker';
    }

    return array(
        'Cache Layer' => !empty($report['primary_page_cache']) ? $report['primary_page_cache'] : 'Not detected',
        'Detection Method' => !empty($methods) ? implode(' + ', array_values(array_unique($methods))) : 'No clear cache-specific method',
        'Live Request Analysis' => !empty($frontend['status_label']) ? $frontend['status_label'] : 'Not tested',
        'Timing Analysis' => !empty($frontend['timing_signal']) ? ageroth_sh_timing_signal_label($frontend['timing_signal']) : 'Not available',
        'Final Verdict' => !empty($frontend['response_type']) ? $frontend['response_type'] : 'Unknown',
    );
}

function ageroth_sh_build_weekly_report_body($report) {
    $groups = ageroth_sh_get_recommendation_groups($report);
    $lines = array('Ageroth Site Health Weekly Report', '', 'Site: ' . home_url('/'));
    $lines[] = 'Overall Score: ' . (isset($report['score']) ? $report['score'] : 'Unknown');
    $lines[] = 'Page Cache: ' . (isset($report['primary_page_cache']) ? $report['primary_page_cache'] : 'Unknown');
    $lines[] = 'Object Cache: ' . (isset($report['primary_object_cache']) ? $report['primary_object_cache'] : 'Unknown');
    $lines[] = 'Generated: ' . current_time('mysql');
    $lines[] = '';

    if (!empty($report['score_breakdown']) && is_array($report['score_breakdown'])) {
        $lines[] = 'Score Breakdown:';
        foreach ($report['score_breakdown'] as $label => $score) {
            $lines[] = '- ' . $label . ': ' . $score;
        }
        $lines[] = '';
    }

    if (!empty($groups['good'])) {
        $lines[] = 'Good:';
        foreach ($groups['good'] as $item) { $lines[] = '- ' . $item; }
        $lines[] = '';
    }
    if (!empty($groups['consider'])) {
        $lines[] = 'Consider:';
        foreach ($groups['consider'] as $item) { $lines[] = '- ' . $item; }
        $lines[] = '';
    }

    $lines[] = 'Open WordPress admin to review the full report.';
    $lines[] = 'This email was generated locally by the Ageroth Site Health plugin. No data was sent to external services.';
    return implode("\\n", $lines);
}

function ageroth_sh_send_weekly_health_report($force_send = false) {
    $settings = ageroth_sh_get_settings();
    if (empty($settings['weekly_report_enabled']) && !$force_send) { return false; }
    $email = isset($settings['alert_email']) ? $settings['alert_email'] : '';
    if (!is_email($email)) { return false; }

    $report = ageroth_sh_build_report();
    $subject = sprintf('[%s] Weekly Site Health Report', wp_specialchars_decode(get_bloginfo('name'), ENT_QUOTES));
    $sent = wp_mail($email, $subject, ageroth_sh_build_weekly_report_body($report));

    $state = ageroth_sh_alert_state();
    $state['last_weekly_report'] = $sent ? current_time('mysql') : '';
    $state['last_weekly_report_status'] = $sent ? 'sent' : 'failed';
    ageroth_sh_update_alert_state($state);
    return $sent;
}


function ageroth_sh_render_dashboard(){ ?>
<div class="wrap ageroth-sh-wrap"><?php $report=ageroth_sh_build_report(); $settings=ageroth_sh_get_settings(); $frontend=$report['frontend_cache_test']; $comparison=$report['comparison'] ?? null; $feedback=get_option(AGEROTH_SH_OPTION_FEEDBACK, []); if(!is_array($feedback)) $feedback=[]; $json_summary=wp_json_encode($report, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES); $confidence_label=ageroth_sh_confidence_label($frontend['confidence']); $timing_signal_label=ageroth_sh_timing_signal_label($frontend['timing_signal']); $timing_interpretation=ageroth_sh_timing_interpretation($frontend['timing_signal']); ?>
<div class="ageroth-sh-hero"><div class="ageroth-sh-hero-brand">
                <div class="ageroth-sh-logo-mark">
                    <img src="<?php echo esc_url(AGEROTH_SH_URL . 'assets/ageroth-logo-admin.png'); ?>" alt="Ageroth" />
                </div><div><h1>Ageroth Site Health</h1><p class="ageroth-sh-intro">Read-only WordPress health checks, cache intelligence, and server diagnostics.</p></div></div><div class="ageroth-sh-hero-actions"><a class="button ageroth-sh-button-secondary" href="<?php echo esc_url(admin_url('admin.php?page=ageroth-site-health-settings')); ?>">Settings</a></div></div>
<div class="ageroth-sh-card ageroth-sh-overview-card"><div class="ageroth-sh-card-header"><h2>Site Health Overview</h2><span class="ageroth-sh-pill">Free 2.3.1</span></div><div class="ageroth-sh-overview-main"><div class="ageroth-sh-status-wrap"><span class="ageroth-sh-status ageroth-sh-status-<?php echo esc_attr($frontend['status']); ?>"><?php echo esc_html($frontend['status_label']); ?></span><p class="ageroth-sh-big-explainer"><?php echo esc_html($frontend['summary']); ?></p><p class="ageroth-sh-sub-explainer"><?php echo esc_html($frontend['explanation']); ?></p></div><div class="ageroth-sh-score-card-mini"><div class="ageroth-sh-score-label">Health Score</div><div class="ageroth-sh-score-circle score-<?php echo esc_attr(ageroth_sh_get_score_level($report['score'])); ?>"><span><?php echo esc_html((string)$report['score']); ?></span></div><p class="ageroth-sh-summary"><?php echo esc_html($report['summary']); ?></p></div></div></div>

<div class="ageroth-sh-grid ageroth-sh-score-grid"><?php foreach($report['score_breakdown'] as $label=>$value): ?><div class="ageroth-sh-card ageroth-sh-mini-score"><span><?php echo esc_html($label); ?></span><strong><?php echo esc_html((string)$value); ?></strong><div class="ageroth-sh-progress-bar"><span style="width: <?php echo esc_attr((int)$value); ?>%;"></span></div></div><?php endforeach; ?></div>
<div class="ageroth-sh-card ageroth-sh-score-explainer">
            <div class="ageroth-sh-card-header"><h2>Health Score Breakdown</h2></div>
            <p>The final score is calculated from the weighted balance of performance, caching, server, and maintenance signals.</p>
            <div class="ageroth-sh-score-formula">Final Score: <?php echo esc_html((string) $report['score']); ?></div>
        </div>

        <div class="ageroth-sh-grid ageroth-sh-summary-grid"><?php foreach($frontend['diagnostics'] as $label=>$value): ?><div class="ageroth-sh-card ageroth-sh-summary-card"><div class="ageroth-sh-summary-label"><?php echo esc_html($label); ?></div><div class="ageroth-sh-summary-value"><?php echo esc_html($value); ?></div></div><?php endforeach; ?></div>

<div class="ageroth-sh-grid ageroth-sh-intelligence-grid"><div class="ageroth-sh-card"><div class="ageroth-sh-card-header"><h2>Cache Intelligence</h2></div><div class="ageroth-sh-kv-grid"><?php ageroth_sh_render_kv_grid($cache_intelligence_v2); ?></div></div><div class="ageroth-sh-card"><div class="ageroth-sh-card-header"><h2>Object Cache / Redis Intelligence</h2></div><div class="ageroth-sh-kv-grid"><?php ageroth_sh_render_kv_grid($report['object_cache_intelligence']); ?></div></div></div>
<div class="ageroth-sh-grid ageroth-sh-intelligence-grid"><div class="ageroth-sh-card"><div class="ageroth-sh-card-header"><h2>WooCommerce Intelligence</h2></div><div class="ageroth-sh-kv-grid"><?php ageroth_sh_render_kv_grid($report['woocommerce_intelligence']); ?></div></div><div class="ageroth-sh-card"><div class="ageroth-sh-card-header"><h2>Server Intelligence</h2></div><div class="ageroth-sh-kv-grid"><?php ageroth_sh_render_kv_grid($report['server_profile']); ?></div></div></div>
<div class="ageroth-sh-grid ageroth-sh-meaning-grid"><div class="ageroth-sh-card"><div class="ageroth-sh-card-header"><h2>What this means</h2></div><p><?php echo esc_html($frontend['what_it_means']); ?></p></div><div class="ageroth-sh-card"><div class="ageroth-sh-card-header"><h2>What to do next</h2></div><ul class="ageroth-sh-recommendation-list"><?php foreach($frontend['next_steps'] as $step): ?><li><?php echo esc_html($step); ?></li><?php endforeach; ?></ul></div></div>
<div class="ageroth-sh-card ageroth-sh-live-card"><div class="ageroth-sh-card-header"><h2>Live Cache Test</h2></div><div class="ageroth-sh-inline-form"><form method="post" class="ageroth-sh-inline-test-form"><?php wp_nonce_field('ageroth_sh_run_test'); ?><div class="ageroth-sh-form-field"><label for="ageroth_sh_test_url"><strong>Primary Test URL</strong></label><input id="ageroth_sh_test_url" type="text" name="test_url" value="<?php echo esc_attr($settings['test_url']); ?>" placeholder="/sample-page/ or full URL of this site"></div><div class="ageroth-sh-form-field"><label for="ageroth_sh_compare_url"><strong>Quick Compare URL</strong></label><input id="ageroth_sh_compare_url" type="text" name="compare_url" value="<?php echo esc_attr($settings['compare_url']); ?>" placeholder="/about/ or full URL of this site"></div><div class="ageroth-sh-inline-buttons"><button class="button button-primary" type="submit" name="ageroth_sh_run_test" value="1">Run Test</button></div></form><form method="post"><?php wp_nonce_field('ageroth_sh_use_homepage'); ?><button class="button" type="submit" name="ageroth_sh_use_homepage" value="1">Use Homepage</button></form></div>
<div class="ageroth-sh-grid ageroth-sh-details-grid"><div class="ageroth-sh-card ageroth-sh-mini-card"><div class="ageroth-sh-summary-label">Tested URL</div><div class="ageroth-sh-summary-value"><?php echo esc_html($frontend['tested_url']); ?></div></div><div class="ageroth-sh-card ageroth-sh-mini-card"><div class="ageroth-sh-summary-label">Final HTTP Status</div><div class="ageroth-sh-summary-value"><?php echo esc_html((string)$frontend['http_status']); ?></div></div><div class="ageroth-sh-card ageroth-sh-mini-card"><div class="ageroth-sh-summary-label">Confidence</div><div class="ageroth-sh-summary-value"><?php echo esc_html($confidence_label); ?></div><div class="ageroth-sh-progress-wrap"><div class="ageroth-sh-progress-bar"><span style="width: <?php echo esc_attr((int)$frontend['confidence']); ?>%;"></span></div><div class="ageroth-sh-progress-text"><?php echo esc_html((string)$frontend['confidence']); ?>%</div></div><div class="ageroth-sh-mini-note"><?php echo esc_html($frontend['timing_explanation']); ?></div></div></div>
<div class="ageroth-sh-grid ageroth-sh-timing-grid"><div class="ageroth-sh-card ageroth-sh-request-card"><div class="ageroth-sh-summary-label">Request 1</div><div class="ageroth-sh-request-time"><?php echo !empty($frontend['request_times'][0]['duration']) ? esc_html(ageroth_sh_human_ms($frontend['request_times'][0]['duration'])) : '—'; ?></div><div class="ageroth-sh-mini-note">First live request</div></div><div class="ageroth-sh-card ageroth-sh-request-card"><div class="ageroth-sh-summary-label">Request 2</div><div class="ageroth-sh-request-time"><?php echo !empty($frontend['request_times'][1]['duration']) ? esc_html(ageroth_sh_human_ms($frontend['request_times'][1]['duration'])) : '—'; ?></div><div class="ageroth-sh-mini-note">Second live request</div></div><div class="ageroth-sh-card ageroth-sh-request-card"><div class="ageroth-sh-summary-label">Timing Signal</div><div class="ageroth-sh-signal-badge signal-<?php echo esc_attr($frontend['timing_signal']); ?>"><?php echo esc_html($timing_signal_label); ?></div><div class="ageroth-sh-mini-note"><?php echo esc_html($frontend['timing_explanation']); ?></div></div></div>
<div class="ageroth-sh-grid ageroth-sh-meaning-grid"><div class="ageroth-sh-card ageroth-sh-mini-card"><div class="ageroth-sh-summary-label">Timing Interpretation</div><div class="ageroth-sh-summary-value"><?php echo esc_html($timing_interpretation); ?></div><div class="ageroth-sh-mini-note"><?php echo esc_html($frontend['timing_explanation']); ?></div></div><div class="ageroth-sh-card ageroth-sh-mini-card"><div class="ageroth-sh-summary-label">Double-Request Detection</div><div class="ageroth-sh-summary-value"><?php echo esc_html($frontend['double_request_summary']); ?></div></div></div></div>
<?php if($comparison): $comp=$comparison['result']; ?><div class="ageroth-sh-card"><div class="ageroth-sh-card-header"><h2>Homepage vs Inner-Page Comparison</h2></div><div class="ageroth-sh-compare-banner severity-<?php echo esc_attr($comparison['severity']); ?>"><?php echo esc_html($comparison['summary']); ?></div><div class="ageroth-sh-grid ageroth-sh-compare-grid"><div class="ageroth-sh-card ageroth-sh-mini-card"><div class="ageroth-sh-summary-label">Primary URL Result</div><div class="ageroth-sh-summary-value"><?php echo esc_html($frontend['status_label']); ?></div><div class="ageroth-sh-mini-note"><?php echo esc_html($frontend['tested_url']); ?></div></div><div class="ageroth-sh-card ageroth-sh-mini-card"><div class="ageroth-sh-summary-label">Compare URL Result</div><div class="ageroth-sh-summary-value"><?php echo esc_html($comp['status_label']); ?></div><div class="ageroth-sh-mini-note"><?php echo esc_html($comparison['url']); ?></div></div><div class="ageroth-sh-card ageroth-sh-mini-card"><div class="ageroth-sh-summary-label">Comparison Takeaway</div><div class="ageroth-sh-summary-value"><?php echo esc_html($comparison['severity'] === 'same' ? 'Behavior matches' : 'Behavior differs'); ?></div><div class="ageroth-sh-mini-note"><?php echo esc_html($comp['double_request_summary']); ?></div></div></div></div><?php endif; ?>
<div class="ageroth-sh-grid ageroth-sh-system-grid"><div class="ageroth-sh-card"><div class="ageroth-sh-card-header"><h2>System Checks</h2></div><div class="ageroth-sh-checks-list"><?php foreach($report['checks'] as $check): ?><div class="ageroth-sh-check-row"><div class="ageroth-sh-check-main"><div class="ageroth-sh-check-topline"><div class="ageroth-sh-check-label"><?php echo esc_html($check['label']); ?></div><?php if(!empty($check['value'])): ?><span class="ageroth-sh-badge status-<?php echo esc_attr($check['status']); ?>"><?php echo esc_html($check['value']); ?></span><?php endif; ?></div><div class="ageroth-sh-check-message"><?php echo esc_html($check['message']); ?></div><?php if(!empty($check['meta'])): ?><div class="ageroth-sh-meta"><?php echo esc_html($check['meta']); ?></div><?php endif; ?></div></div><?php endforeach; ?></div></div><div class="ageroth-sh-card"><div class="ageroth-sh-card-header"><h2>Recommended Improvements</h2></div><ul class="ageroth-sh-recommendation-list"><?php foreach($report['recommendations'] as $item): ?><li><?php echo esc_html($item); ?></li><?php endforeach; ?></ul><hr><h2>What would make this report more useful?</h2><form method="post"><?php wp_nonce_field('ageroth_sh_save_feedback'); ?><textarea name="ageroth_sh_feedback" rows="4" style="width:100%;"></textarea><p><button class="button button-primary" type="submit" name="ageroth_sh_save_feedback" value="1">Save Feedback</button></p></form><?php if(!empty($feedback)): ?><h3>Recent Feedback</h3><ul class="ageroth-sh-recommendation-list"><?php foreach($feedback as $item): ?><li><strong><?php echo esc_html($item['created_at']); ?>:</strong> <?php echo esc_html($item['message']); ?></li><?php endforeach; ?></ul><?php endif; ?></div></div>
<div class="ageroth-sh-card"><details><summary><strong>Technical Details</strong></summary><?php if(!empty($frontend['headers'])): ?><h3>Matched Signals</h3><p><?php echo esc_html(implode(' · ', $frontend['headers'])); ?></p><?php endif; ?><?php if(!empty($frontend['negative_hits'])): ?><h3>Negative Signals</h3><p><?php echo esc_html(implode(' · ', $frontend['negative_hits'])); ?></p><?php endif; ?><?php if(!empty($frontend['neutral_hits'])): ?><h3>Neutral Cache Signals</h3><p><?php echo esc_html(implode(' · ', $frontend['neutral_hits'])); ?></p><?php endif; ?><?php if(!empty($frontend['why_uncached'])): ?><h3>Why this may be uncached</h3><ul class="ageroth-sh-recommendation-list"><?php foreach($frontend['why_uncached'] as $reason): ?><li><?php echo esc_html($reason); ?></li><?php endforeach; ?></ul><?php endif; ?><h3>Snapshot</h3><ul class="ageroth-sh-recommendation-list"><?php foreach($report['snapshot'] as $label=>$value): ?><li><strong><?php echo esc_html($label); ?>:</strong> <?php echo esc_html($value); ?></li><?php endforeach; ?></ul><h3>Export Summary</h3><textarea rows="18" readonly style="width:100%;font-family:monospace;"><?php echo esc_textarea($json_summary); ?></textarea><p><button class="button" type="button" onclick="navigator.clipboard.writeText(this.parentNode.previousElementSibling.value)">Copy to clipboard</button></p></details></div>
</div><?php }
function ageroth_sh_render_settings(){
    if (!current_user_can('manage_options')) {
        return;
    }

    $settings = ageroth_sh_get_settings();
    $state = ageroth_sh_alert_state();
    ?>
    <div class="wrap ageroth-sh-wrap">
        <div class="ageroth-sh-card">
            <div class="ageroth-sh-card-header">
                <h2>Ageroth Site Health Settings</h2>
                <span class="ageroth-sh-muted">Free 2.3.1</span>
            </div>

            <?php if (filter_input(INPUT_GET, 'ageroth_sh_weekly_report', FILTER_SANITIZE_SPECIAL_CHARS)) : ?><div class="notice notice-success inline"><p>Weekly report processed. Check your inbox.</p></div><?php endif; ?>
            <?php if (filter_input(INPUT_GET, 'ageroth_sh_test_alert', FILTER_SANITIZE_SPECIAL_CHARS)) : ?>
                <div class="notice notice-success inline"><p>Test alert processed. Check the alert status below and your inbox.</p></div>
            <?php endif; ?>

            <form method="post" action="options.php">
                <?php settings_fields('ageroth_sh_settings_group'); ?>

                <h3>Test URLs</h3>
                <table class="form-table" role="presentation">
                    <tr>
                        <th scope="row"><label for="ageroth_sh_test_url_default">Default Primary Test URL</label></th>
                        <td>
                            <input name="<?php echo esc_attr(AGEROTH_SH_OPTION_SETTINGS); ?>[test_url]" id="ageroth_sh_test_url_default" type="text" class="regular-text" value="<?php echo esc_attr($settings['test_url'] ?? ''); ?>" />
                            <p class="description">Leave empty to use the homepage.</p>
                        </td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="ageroth_sh_compare_url_default">Default Compare URL</label></th>
                        <td>
                            <input name="<?php echo esc_attr(AGEROTH_SH_OPTION_SETTINGS); ?>[compare_url]" id="ageroth_sh_compare_url_default" type="text" class="regular-text" value="<?php echo esc_attr($settings['compare_url'] ?? ''); ?>" />
                            <p class="description">Optional. Use this to compare the homepage with another public page.</p>
                        </td>
                    </tr>
                </table>

                <hr>

                <h3>Email Alerts</h3>
                <p class="description">Email alerts are local and use WordPress mail. No data is sent to external services.</p>

                <table class="form-table" role="presentation">
                    <tr>
                        <th scope="row">Enable Email Alerts</th>
                        <td>
                            <label>
                                <input type="checkbox" name="<?php echo esc_attr(AGEROTH_SH_OPTION_SETTINGS); ?>[email_alerts_enabled]" value="1" <?php checked($settings['email_alerts_enabled'] ?? '0', '1'); ?> />
                                Send alerts when health or cache signals become problematic.
                            </label>
                        </td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="ageroth_sh_alert_email">Alert Email</label></th>
                        <td>
                            <input name="<?php echo esc_attr(AGEROTH_SH_OPTION_SETTINGS); ?>[alert_email]" id="ageroth_sh_alert_email" type="email" class="regular-text" value="<?php echo esc_attr($settings['alert_email'] ?? get_option('admin_email')); ?>" />
                        </td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="ageroth_sh_alert_score_threshold">Overall Score Threshold</label></th>
                        <td>
                            <input name="<?php echo esc_attr(AGEROTH_SH_OPTION_SETTINGS); ?>[alert_score_threshold]" id="ageroth_sh_alert_score_threshold" type="number" min="1" max="100" value="<?php echo esc_attr((string) ($settings['alert_score_threshold'] ?? 75)); ?>" />
                            <p class="description">Send an alert when the overall health score drops below this value.</p>
                        </td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="ageroth_sh_alert_cache_threshold">Cache Score Threshold</label></th>
                        <td>
                            <input name="<?php echo esc_attr(AGEROTH_SH_OPTION_SETTINGS); ?>[alert_cache_threshold]" id="ageroth_sh_alert_cache_threshold" type="number" min="1" max="100" value="<?php echo esc_attr((string) ($settings['alert_cache_threshold'] ?? 60)); ?>" />
                            <p class="description">Send an alert when the caching score drops below this value.</p>
                        </td>
                    </tr>
                    <tr>
                        <th scope="row">Specific Alert Triggers</th>
                        <td>
                            <label>
                                <input type="checkbox" name="<?php echo esc_attr(AGEROTH_SH_OPTION_SETTINGS); ?>[alert_when_page_cache_missing]" value="1" <?php checked($settings['alert_when_page_cache_missing'] ?? '1', '1'); ?> />
                                Alert if page cache is no longer detected.
                            </label>
                            <br>
                            <label>
                                <input type="checkbox" name="<?php echo esc_attr(AGEROTH_SH_OPTION_SETTINGS); ?>[alert_when_object_cache_missing]" value="1" <?php checked($settings['alert_when_object_cache_missing'] ?? '0', '1'); ?> />
                                Alert if persistent object cache is not detected.
                            </label>
                        </td>
                    </tr>
                    <tr>
                        <th scope="row"><label for="ageroth_sh_alert_frequency">Alert Frequency</label></th>
                        <td>
                            <select name="<?php echo esc_attr(AGEROTH_SH_OPTION_SETTINGS); ?>[alert_frequency]" id="ageroth_sh_alert_frequency">
                                <option value="daily" <?php selected($settings['alert_frequency'] ?? 'daily', 'daily'); ?>>Daily if the same issue continues</option>
                                <option value="weekly" <?php selected($settings['alert_frequency'] ?? 'daily', 'weekly'); ?>>Weekly if the same issue continues</option>
                                <option value="changes_only" <?php selected($settings['alert_frequency'] ?? 'daily', 'changes_only'); ?>>Only when the issue changes</option>
                            </select>
                        </td>
                    </tr>
                    <tr>
                        <th scope="row">Weekly Health Report</th>
                        <td>
                            <label>
                                <input type="checkbox" name="<?php echo esc_attr(AGEROTH_SH_OPTION_SETTINGS); ?>[weekly_report_enabled]" value="1" <?php checked($settings['weekly_report_enabled'] ?? '0', '1'); ?> />
                                Send a weekly site health summary email.
                            </label>
                        </td>
                    </tr>
                </table>

                <?php submit_button('Save Settings'); ?>
            </form>

            <hr>

            <h3>Alert Status</h3>
            <table class="form-table" role="presentation">
                <tr>
                    <th scope="row">Last Checked</th>
                    <td><?php echo esc_html($state['last_checked'] ?? 'Not checked yet'); ?></td>
                </tr>
                <tr>
                    <th scope="row">Last Sent</th>
                    <td><?php echo esc_html($state['last_sent'] ?? 'No alert sent yet'); ?></td>
                </tr>
                <tr>
                    <th scope="row">Last Status</th>
                    <td><?php echo esc_html($state['last_status'] ?? 'No status yet'); ?></td>
                </tr>
                <tr>
                    <th scope="row">Last Weekly Report</th>
                    <td><?php echo esc_html($state['last_weekly_report'] ?? 'No weekly report sent yet'); ?></td>
                </tr>
                <tr>
                    <th scope="row">Weekly Report Status</th>
                    <td><?php echo esc_html($state['last_weekly_report_status'] ?? 'No status yet'); ?></td>
                </tr>
                <?php if (!empty($state['last_issues']) && is_array($state['last_issues'])) : ?>
                    <tr>
                        <th scope="row">Last Issues</th>
                        <td>
                            <ul>
                                <?php foreach ($state['last_issues'] as $issue) : ?>
                                    <li><?php echo esc_html($issue); ?></li>
                                <?php endforeach; ?>
                            </ul>
                        </td>
                    </tr>
                <?php endif; ?>
            </table>

            <form method="post" style="display:inline-block;margin-right:8px;">
                <?php wp_nonce_field('ageroth_sh_send_test_alert'); ?>
                <p><button class="button" type="submit" name="ageroth_sh_send_test_alert" value="1">Send Test Alert</button></p>
            </form>
            <form method="post" style="display:inline-block;">
                <?php wp_nonce_field('ageroth_sh_send_weekly_report_now'); ?>
                <p><button class="button" type="submit" name="ageroth_sh_send_weekly_report_now" value="1">Send Weekly Report Now</button></p>
            </form>

            <p class="description" style="margin-top:12px;">This plugin is read-only and does not collect or send personal data.</p>
        </div>
    </div>
    <?php
}
?>