/*
Plugin Name: Image Processor & Optimizer
Description: Downloads external images, sets featured image, centers images, optimizes them in background.
Version: 1.2
Author: rasanashr
*/

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

add_action('save_post', 'process_external_images', 10, 3);

function process_external_images($post_id, $post, $update) {
    if (wp_is_post_revision($post_id) || wp_is_post_autosave($post_id)) return;
    if ($post->post_type != 'post') return;
    if (!in_array($post->post_status, ['publish', 'future'])) return;

    $content = $post->post_content;
    $dom = new DOMDocument();
    libxml_use_internal_errors(true);
    $dom->loadHTML(mb_convert_encoding($content, 'HTML-ENTITIES', 'UTF-8'));
    libxml_clear_errors();
    $xpath = new DOMXPath($dom);
    $images = $xpath->query('//img');

    if (!$images || $images->length === 0) return;

    require_once ABSPATH . 'wp-admin/includes/image.php';
    require_once ABSPATH . 'wp-admin/includes/file.php';
    require_once ABSPATH . 'wp-admin/includes/media.php';

    $featured_set = false;
    $updated = false;

    foreach ($images as $img) {
        $src = $img->getAttribute('data-src') ?: $img->getAttribute('src');
        if (strpos($src, home_url()) === 0) continue;

        $parsed_url = strtok($src, '?#');
        $path = parse_url($parsed_url, PHP_URL_PATH);
        $ext = strtolower(pathinfo($path, PATHINFO_EXTENSION));
        if (!in_array($ext, ['jpg', 'jpeg', 'png', 'gif', 'webp'])) continue;

        $tmp = download_url($parsed_url);
        if (is_wp_error($tmp)) continue;

        $file_array = [
            'name' => basename($path),
            'tmp_name' => $tmp,
        ];
        $overrides = ['test_form' => false];
        $results = wp_handle_sideload($file_array, $overrides);

        if (!empty($results['error'])) {
            @unlink($file_array['tmp_name']);
            continue;
        }

        $file_path = $results['file'];
        $attachment = [
            'post_mime_type' => $results['type'],
            'post_title' => sanitize_file_name(basename($file_path)),
            'post_content' => '',
            'post_status' => 'inherit'
        ];
        $attach_id = wp_insert_attachment($attachment, $file_path, $post_id);
        if (is_wp_error($attach_id)) continue;

        $attach_meta = wp_generate_attachment_metadata($attach_id, $file_path);
        wp_update_attachment_metadata($attach_id, $attach_meta);
        update_post_meta($attach_id, '_wp_attachment_image_alt', $post->post_title);

        // بهینه‌سازی در پس‌زمینه
        do_action('optimize_image_file_background', $file_path);

        $new_src = wp_get_attachment_url($attach_id);
        $img->setAttribute('src', esc_url($new_src));
        $img->removeAttribute('data-src');

        $existing_class = $img->getAttribute('class');
        $img->setAttribute('class', trim($existing_class . ' aligncenter'));

        if (!$featured_set) {
            set_post_thumbnail($post_id, $attach_id);
            $featured_set = true;
        }

        $updated = true;
    }

    if ($updated) {
        // فقط تگ body را استخراج کن
        $body = $dom->getElementsByTagName('body')->item(0);
        $new_content = '';
        foreach ($body->childNodes as $child) {
            $new_content .= $dom->saveHTML($child);
        }

        // بروزرسانی محتوا
        wp_remove_object_terms($post_id, null, 'post_tag'); // باگ خاص در برخی نسخه‌ها جلوگیری می‌شود
        remove_action('save_post', 'process_external_images');
        wp_update_post(['ID' => $post_id, 'post_content' => $new_content]);
        add_action('save_post', 'process_external_images', 10, 3);
    }
}

// ✅ هوک بهینه‌سازی تصاویر در پس‌زمینه
add_action('optimize_image_file_background', function ($file_path) {
    if (!file_exists($file_path)) return;
    $ext = strtolower(pathinfo($file_path, PATHINFO_EXTENSION));

    if (in_array($ext, ['jpg', 'jpeg'])) {
        exec("jpegoptim --strip-all --max=85 " . escapeshellarg($file_path));
    } elseif ($ext === 'png') {
        exec("optipng -o2 " . escapeshellarg($file_path));
    }
}, 10, 1);