/*
Plugin Name: Image Processor & Optimizer
Description: Downloads external images, sets featured image, centers images, optimizes them in background.
Version: 1.1
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;
    $dom = new DOMDocument();
    @$dom->loadHTML(mb_convert_encoding($content, 'HTML-ENTITIES', 'UTF-8'), LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
    $images_nodes = $dom->getElementsByTagName('img');

    $images = [];
    foreach ($images_nodes as $img) {
        $src = $img->getAttribute('src');
        $data_src = $img->getAttribute('data-src');
        $image_url = !empty($data_src) ? $data_src : $src;
        if (strpos($image_url, home_url()) === 0) continue;

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

        $images[] = ['node' => $img, 'url' => $parsed_url, 'extension' => $extension];
    }

    if (empty($images)) return;

    $upload_dir = wp_upload_dir();
    $new_content = $content;
    $featured_set = false;
    $success = true;

    foreach ($images as $image) {
        $img_node = $image['node'];
        $image_url = $image['url'];

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

        $tmp = download_url($image_url);
        if (is_wp_error($tmp)) {
            $success = false;
            continue;
        }

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

        if (isset($results['error'])) {
            @unlink($file['tmp_name']);
            $success = false;
            continue;
        }

        $url = $results['url'];
        $type = $results['type'];
        $file = $results['file'];
        $filename = basename($file);

        $attachment = [
            'post_mime_type' => $type,
            'post_title' => sanitize_file_name($filename),
            'post_content' => '',
            'post_status' => 'inherit'
        ];
        $attach_id = wp_insert_attachment($attachment, $file, $post_id);
        if (is_wp_error($attach_id)) {
            @unlink($file);
            $success = false;
            continue;
        }

        wp_update_attachment_metadata($attach_id, wp_generate_attachment_metadata($attach_id, $file));
        update_post_meta($attach_id, '_wp_attachment_image_alt', $post->post_title);

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

        // 🔁 جایگزینی تصویر در محتوا
        $new_src = wp_get_attachment_url($attach_id);
        $img_node->setAttribute('src', esc_url($new_src));
        $img_node->removeAttribute('data-src');
        $img_node->setAttribute('class', 'aligncenter');
        $new_img_tag = $dom->saveHTML($img_node);

        $new_content = str_replace($dom->saveHTML($img_node), $new_img_tag, $new_content);

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

    if ($success) {
        remove_action('save_post', 'process_external_images');
        wp_update_post([
            'ID' => $post_id,
            'post_content' => $dom->saveHTML()
        ]);
        add_action('save_post', 'process_external_images', 10, 3);
    } else {
        wp_update_post(['ID' => $post_id, 'post_status' => 'draft']);
    }
}

// ✅ تعریف هوک بهینه‌سازی تصاویر
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);