<?php
/**
 * AKSRT Page Templates
 *
 * @package AKSRT
 * @since 1.0.0
 */

defined('ABSPATH') || exit;

class AKSRT_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('template_include', [$this, 'load_taxonomy_template']);
        add_filter('page_template_hierarchy', [$this, 'template_hierarchy']);
        add_filter('aksrt_page_template_hierarchy', [$this, 'template_hierarchy']);

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

    /**
     * 主线页面模板：内容 / 用户 / 付费 / 论坛 / 商城主线可选模板。
     */
    private function mainline_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'),
            'templates/pages/page-posts-navs.php' => __('AKSRT - 文章导航', 'aksrt'),
            'templates/pages/page-friends.php' => __('AKSRT - 友情链接', 'aksrt'),
            'templates/pages/page-orders.php' => __('AKSRT - 订单中心', 'aksrt'),
            'templates/pages/page-revenue.php' => __('AKSRT - 收益中心', 'aksrt'),
            'templates/pages/page-cart.php' => __('AKSRT - 购物车', 'aksrt'),
            'templates/pages/page-product.php' => __('AKSRT - 商品详情', 'aksrt'),
            'templates/pages/page-product-edit.php' => __('AKSRT - 商品编辑', 'aksrt'),
            'templates/pages/page-forums.php' => __('AKSRT - 论坛', 'aksrt'),
            'templates/forum/forum-compose.php' => __('AKSRT - 发帖', 'aksrt'),
        ];
    }

    /**
     * 兼容保留页面模板：非 Zibll 主线能力（文档模式、下载中心、专题、消息、投稿）。
     *
     * 这些模板文件与已分配它们的历史页面继续正常渲染（见 load_page_template()），
     * 只是默认不再出现在 wp-admin 页面模板下拉中，避免污染主线内容心智。
     * 站点可通过 aksrt_show_compat_page_templates() 重新暴露下拉选项。
     */
    private function compat_page_template_map(): array {
        return [
            'templates/pages/page-special.php' => __('AKSRT - 专题聚合（兼容）', 'aksrt'),
            'templates/pages/page-documentnav.php' => __('AKSRT - 文档导航（兼容）', 'aksrt'),
            'templates/pages/page-messages.php' => __('AKSRT - 消息中心（兼容）', 'aksrt'),
            'templates/pages/page-download.php' => __('AKSRT - 下载中心（兼容）', 'aksrt'),
            'templates/pages/page-submit.php' => __('AKSRT - 前台投稿（兼容）', 'aksrt'),
        ];
    }

    private function page_template_map(): array {
        $map = $this->mainline_page_template_map();

        // 兼容页面模板默认隐藏出下拉；仅在站点显式开启时暴露。
        if (function_exists('aksrt_show_compat_page_templates') && aksrt_show_compat_page_templates()) {
            $map = array_merge($map, $this->compat_page_template_map());
        }

        return $map;
    }

    /**
     * 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 product taxonomy templates.
     */
    public function load_taxonomy_template(string $template): string {
        if (is_tax('aksrt_product_cat')) {
            $cat_template = AKSRT_DIR . '/templates/shop/product-cat.php';
            if (file_exists($cat_template)) {
                return $cat_template;
            }
        }

        if (is_tax('aksrt_product_tag')) {
            $tag_template = AKSRT_DIR . '/templates/shop/product-tag.php';
            if (file_exists($tag_template)) {
                return $tag_template;
            }
        }

        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();
    }
}

return AKSRT_Templates::get_instance();