// Ensure lazy loading and adaptive delivery
                $upload['smushit_lazy'] = true;
                // Generate responsive image sizes (WordPress style)
                $sizes = array('thumbnail' => 150, 'medium' => 300, 'large' => 1024);
                $responsive = array();
                foreach ($sizes as $label => $width) {
                    if ($image_info && isset($image_info[0]) && $image_info[0] > $width) {
                        $resized_path = preg_replace('/\.[^.]+$/', '-' . $label . '.$0', $image_path);
                        if (function_exists('imagecreatetruecolor')) {
                            switch ($mime) {
                                case 'image/jpeg': $src = imagecreatefromjpeg($image_path); break;
                                case 'image/png': $src = imagecreatefrompng($image_path); break;
                                case 'image/gif': $src = imagecreatefromgif($image_path); break;
                                default: $src = null;
                            }
                            if ($src) {
                                $height = intval($width * $image_info[1] / $image_info[0]);
                                $dst = imagecreatetruecolor($width, $height);
                                imagecopyresampled($dst, $src, 0, 0, 0, 0, $width, $height, $image_info[0], $image_info[1]);
                                switch ($mime) {
                                    case 'image/jpeg': imagejpeg($dst, $resized_path); break;
                                    case 'image/png': imagepng($dst, $resized_path); break;
                                    case 'image/gif': imagegif($dst, $resized_path); break;
                                }
                                $responsive[$label] = $resized_path;
                                imagedestroy($src);
                                imagedestroy($dst);
                            }
                        }
                    }
                }
                if (!empty($responsive)) {
                    $upload['smushit_responsive'] = $responsive;
                }
// Admin page for manual bulk optimization
add_action('admin_menu', function() {
    add_management_page(
        'SmushIt Bulk Optimization',
        'SmushIt Bulk Optimization',
        'manage_options',
        'smushit-bulk-opt',
        function() {
            echo '<div class="wrap"><h1>SmushIt Bulk Optimization</h1>';
            if (isset($_POST['smushit_bulk_optimize'])) {
                // Run bulk optimization
                $upload_dir = wp_upload_dir();
                $base_dir = $upload_dir['basedir'];
                $image_mime_types = array('jpg', 'jpeg', 'png', 'gif');
                $images = array();
                $rii = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($base_dir));
                foreach ($rii as $file) {
                    if ($file->isDir()) continue;
                    $ext = strtolower(pathinfo($file->getFilename(), PATHINFO_EXTENSION));
                    if (in_array($ext, $image_mime_types, true)) {
                        $images[] = array('file' => $file->getPathname(), 'type' => 'image/' . ($ext === 'jpg' ? 'jpeg' : $ext));
                    }
                }
                do_action('smushit_batch_optimize', $images);
                echo '<div class="notice notice-success"><p>Bulk optimization triggered!</p></div>';
            }
            echo '<form method="post"><input type="hidden" name="smushit_bulk_optimize" value="1" />';
            submit_button('Run Bulk Optimization');
            echo '</form></div>';
        }
    );
});
// Scaffold: Batch/background image optimization via WP Cron
add_action( 'smushit_batch_optimize', function( $uploads ) {
    foreach ( $uploads as $upload ) {
        smushit_optimize_uploaded_image( $upload );
    }
} );
if ( ! function_exists( 'register_activation_hook' ) ) {
    function register_activation_hook( $file, $callback ) {}
}
if ( ! function_exists( 'register_deactivation_hook' ) ) {
    function register_deactivation_hook( $file, $callback ) {}
}
// Plugin activation hook
register_activation_hook( __FILE__, function() {
    // Schedule cron event for future bulk optimization
    if ( ! wp_next_scheduled( 'smushit_cron_bulk_optimize' ) ) {
        wp_schedule_event( time() + 300, 'daily', 'smushit_cron_bulk_optimize' );
    }
    // Bulk optimize all existing images in uploads directory
    $upload_dir = wp_upload_dir();
    $base_dir = $upload_dir['basedir'];
    $image_mime_types = array( 'jpg', 'jpeg', 'png', 'gif' );
    $images = array();
    $rii = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($base_dir));
    foreach ($rii as $file) {
        if ($file->isDir()) continue;
        $ext = strtolower(pathinfo($file->getFilename(), PATHINFO_EXTENSION));
        if (in_array($ext, $image_mime_types, true)) {
            $images[] = array('file' => $file->getPathname(), 'type' => 'image/' . ($ext === 'jpg' ? 'jpeg' : $ext));
        }
    }
    do_action('smushit_batch_optimize', $images);
} );

// Plugin deactivation hook
register_deactivation_hook( __FILE__, function() {
    // Remove scheduled cron event
    wp_clear_scheduled_hook( 'smushit_cron_bulk_optimize' );
// Cron event handler for scheduled bulk optimization
add_action('smushit_cron_bulk_optimize', function() {
    $upload_dir = wp_upload_dir();
    $base_dir = $upload_dir['basedir'];
    $image_mime_types = array('jpg', 'jpeg', 'png', 'gif');
    $images = array();
    $rii = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($base_dir));
    foreach ($rii as $file) {
        if ($file->isDir()) continue;
        $ext = strtolower(pathinfo($file->getFilename(), PATHINFO_EXTENSION));
        if (in_array($ext, $image_mime_types, true)) {
            $images[] = array('file' => $file->getPathname(), 'type' => 'image/' . ($ext === 'jpg' ? 'jpeg' : $ext));
        }
    }
    do_action('smushit_batch_optimize', $images);
});
    // Cleanup tasks (e.g., flush rewrite rules, remove options)
} );