<?php
/**
 * @package AKSRT
 */

namespace AKSRT\Core;

defined('ABSPATH') || exit;

class Templates {

    private static $instance = null;

    private function __construct() {}

    public static function get_instance(): self {
        if (null === self::$instance) {
            self::$instance = new self();
        }

        return self::$instance;
    }

    public function init(): void {
        add_filter('theme_page_templates', [$this, 'register_page_templates']);
        add_filter('template_include', [$this, 'load_page_template']);
        add_filter('page_template_hierarchy', [$this, 'template_hierarchy']);
        add_filter('aksrt_page_template_hierarchy', [$this, 'template_hierarchy']);

        // 短代码注册统一在 Shortcodes（registry）；本类只提供 archive/profile 渲染实现。
    }

    /**
     * Selectable page templates shown in wp-admin for the rebuilt mainline.
     */
    private function page_template_map(): array {
        return [
            'templates/pages/page-sign.php' => __('AKSRT - 登录/注册', 'aksrt'),
            'templates/pages/page-profile.php' => __('AKSRT - 个人中心', 'aksrt'),
            'templates/pages/page-user-home.php' => __('AKSRT - 用户主页', 'aksrt'),
            'templates/pages/page-archives.php' => __('AKSRT - 文章归档', 'aksrt'),
            'templates/pages/page-categories.php' => __('AKSRT - 分类汇总', 'aksrt'),
            'templates/pages/page-newposts.php' => __('AKSRT - 最新文章', 'aksrt'),
            // 注意：page-newposts = 最新文章列表；投稿页是 page-submit（写文章/投稿）
            'templates/pages/page-submit.php' => __('AKSRT - 写文章/投稿', 'aksrt'),
            'templates/pages/page-posts-navs.php' => __('AKSRT - 文章导航', 'aksrt'),
            'templates/pages/page-friends.php' => __('AKSRT - 友情链接', 'aksrt'),
        ];
    }

    /**
     * Register selectable page templates in wp-admin.
     */
    public function register_page_templates(array $templates): array {
        foreach ($this->page_template_map() as $template_file => $label) {
            $templates[$template_file] = $label;
        }

        return $templates;
    }

    /**
     * Resolve theme page templates through the shared page-template router.
     */
    public function load_page_template(string $template): string {
        global $post;

        if (!$post) {
            return $template;
        }

        $page_template_meta = get_post_meta($post->ID, '_wp_page_template', true);
        $resolved_template = function_exists('aksrt_resolve_page_template_file')
            ? aksrt_resolve_page_template_file(
                is_string($page_template_meta) ? $page_template_meta : '',
                (string) $post->post_name
            )
            : '';

        if ($resolved_template !== '' && function_exists('aksrt_locate_template_file')) {
            $resolved_path = aksrt_locate_template_file($resolved_template);
            if ($resolved_path) {
                return $resolved_path;
            }
        }

        return $template;
    }

    public function template_hierarchy(array $templates): array {
        return $templates;
    }

    /**
     * Load dedicated taxonomy templates.
     */
    public function load_taxonomy_template(string $template): string {
        return $template;
    }

    public function render_archive_shortcode(array $attrs = [], string $content = ''): string {
        $template = AKSRT_DIR . '/templates/shortcodes/archive.php';
        if (!file_exists($template)) {
            return '';
        }
        ob_start();
        include $template;
        return (string) ob_get_clean();
    }

    public function render_profile_shortcode(array $attrs = [], string $content = ''): string {
        $template = AKSRT_DIR . '/templates/shortcodes/profile.php';
        if (!file_exists($template)) {
            return '';
        }
        ob_start();
        include $template;
        return (string) ob_get_clean();
    }
}