<?php
defined('ABSPATH') || exit();
final class APEARI_Preview
{
    private ?array $data = null;
    public function __construct()
    {
        add_action('template_redirect', [$this, 'start'], 0);
    }
    public function start(): void
    {
        if (!isset($_GET['apeari_preview'])) {
            return;
        }
        $data = current_user_can('manage_options')
            ? APEARI_Workspace::load(sanitize_text_field(wp_unslash($_GET['apeari_preview'])))
            : new WP_Error('apeari_access', __('Brak dostępu.', 'apeari'));
        if (is_wp_error($data)) {
            wp_die(esc_html($data->get_error_message()), 'Apeari', ['response' => 403]);
        }
        $ref = 'page:' . get_queried_object_id();
        if (!is_page() || $ref !== $data['lastPage']) {
            wp_die(esc_html__('Podgląd dotyczy wyłącznie wybranej strony.', 'apeari'), 'Apeari', [
                'response' => 403,
            ]);
        }
        $this->data = $data;
        nocache_headers();
        header('Cache-Control: private, no-store, max-age=0');
        header('Referrer-Policy: no-referrer');
        header('X-Robots-Tag: noindex, nofollow');
        header("Content-Security-Policy: frame-ancestors 'self'");
        add_filter('show_admin_bar', '__return_false');
        add_filter('the_content', [$this, 'content'], 8);
        add_filter('render_block', [$this, 'mark'], 99, 2);
        add_action('wp_enqueue_scripts', static function () use ($ref) {
            wp_enqueue_script(
                'apeari-bridge',
                APEARI_URL . 'assets/js/preview/bridge.js',
                ['wp-i18n'],
                APEARI_VERSION . '.' . filemtime(APEARI_PATH . 'assets/js/preview/bridge.js'),
                true,
            );
            wp_add_inline_script(
                'apeari-bridge',
                'window.APEARI_BRIDGE=' .
                    wp_json_encode([
                        'pageRef' => $ref,
                        'parentOrigin' =>
                            wp_parse_url(admin_url(), PHP_URL_SCHEME) .
                            '://' .
                            wp_parse_url(admin_url(), PHP_URL_HOST) .
                            (wp_parse_url(admin_url(), PHP_URL_PORT)
                                ? ':' . wp_parse_url(admin_url(), PHP_URL_PORT)
                                : ''),
                        'blocks' => APEARI_Block_Policy::BLOCKS,
                    ]) .
                    ';',
                'before',
            );
            wp_set_script_translations('apeari-bridge', 'apeari', APEARI_PATH . 'languages');
        });
    }
    public function content(string $content): string
    {
        $post = get_post();
        if (!$post || 'page:' . $post->ID !== $this->data['lastPage']) {
            return $content;
        }
        if (empty($_GET['apeari_original'])) {
            $content = $this->data['drafts'][$this->data['lastPage']]['content'] ?? $content;
        }
        return APEARI_Documents::mark($content, $this->data['lastPage']);
    }
    public function mark(string $html, array $block): string
    {
        if (
            empty($block['attrs']['apeariRef']) ||
            !in_array($block['blockName'], APEARI_Block_Policy::BLOCKS, true)
        ) {
            return $html;
        }
        $tag = new WP_HTML_Tag_Processor($html);
        if ($tag->next_tag() && !$tag->get_attribute('data-apeari-ref')) {
            $tag->set_attribute('data-apeari-ref', $block['attrs']['apeariRef']);
            $tag->set_attribute('data-apeari-name', $block['blockName']);
            $tag->set_attribute('data-apeari-version', $block['attrs']['apeariVersion']);
        }
        return $tag->get_updated_html();
    }
}