<?php
/**
 * AKSRT Pay System — 统一付费内容系统（1:1 对齐 zibll）
 *
 * 核心机制：
 * - 任何 post 通过 _aksrt_pay meta 成为付费文章
 * - pay_type 驱动行为（no/reading/download/gallery/video/vip）
 * - 统一的价格、VIP 价、下载源、属性、图库、视频管理
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

// ============================================================
// 付费类型常量
// ============================================================

if (!defined('AKSRT_PAY_TYPE_NO')) {
    define('AKSRT_PAY_TYPE_NO', \AKSRT\Core\DomainModel::PAY_TYPE_NO);
}
if (!defined('AKSRT_PAY_TYPE_READING')) {
    define('AKSRT_PAY_TYPE_READING', \AKSRT\Core\DomainModel::PAY_TYPE_READING);
}
if (!defined('AKSRT_PAY_TYPE_DOWNLOAD')) {
    define('AKSRT_PAY_TYPE_DOWNLOAD', \AKSRT\Core\DomainModel::PAY_TYPE_DOWNLOAD);
}
if (!defined('AKSRT_PAY_TYPE_GALLERY')) {
    define('AKSRT_PAY_TYPE_GALLERY', \AKSRT\Core\DomainModel::PAY_TYPE_GALLERY);
}
if (!defined('AKSRT_PAY_TYPE_VIDEO')) {
    define('AKSRT_PAY_TYPE_VIDEO', \AKSRT\Core\DomainModel::PAY_TYPE_VIDEO);
}
if (!defined('AKSRT_PAY_TYPE_VIP')) {
    define('AKSRT_PAY_TYPE_VIP', \AKSRT\Core\DomainModel::PAY_TYPE_VIP);
}

/**
 * 检查用户是否为 VIP 豁免用户（免扣积分下载）。
 *
 * @param int $user_id
 * @return bool
 */
if (!function_exists('aksrt_is_vip_exempt')) {
    function aksrt_is_vip_exempt(int $user_id = 0): bool {
        if ($user_id <= 0) {
            $user_id = get_current_user_id();
        }
        if ($user_id <= 0) {
            return false;
        }
        // 优先使用 aksrt_is_download_credit_exempt_user（如果已定义）
        if (function_exists('aksrt_is_download_credit_exempt_user')) {
            return aksrt_is_download_credit_exempt_user($user_id);
        }
        // 回退：直接检查 VIP 角色
        if (function_exists('aksrt_is_vip') && aksrt_is_vip($user_id)) {
            return true;
        }
        return false;
    }
}

function aksrt_get_pay_types(): array {
    return \AKSRT\Core\DomainModel::pay_type_labels();

    return [
        AKSRT_PAY_TYPE_NO       => __('不付费', 'aksrt'),
        AKSRT_PAY_TYPE_READING  => __('付费阅读', 'aksrt'),
        AKSRT_PAY_TYPE_DOWNLOAD => __('付费下载', 'aksrt'),
        AKSRT_PAY_TYPE_GALLERY  => __('付费图库', 'aksrt'),
        AKSRT_PAY_TYPE_VIDEO    => __('付费视频', 'aksrt'),
        AKSRT_PAY_TYPE_VIP      => __('VIP 专属', 'aksrt'),
    ];
}

/**
 * Cash payment methods available for content/topic cashiers.
 *
 * @return array<int, array{id:string,name:string}>
 */
if (!function_exists('aksrt_list_cash_payment_methods')) {
    function aksrt_list_cash_payment_methods(bool $logged_in = true): array {
        $ids = $logged_in
            ? ['balance', 'alipay', 'wechatpay', 'paypal', 'stripe', 'epay_alipay', 'epay_wxpay']
            : ['alipay', 'wechatpay', 'paypal', 'stripe', 'epay_alipay', 'epay_wxpay'];

        if (!class_exists('\AKSRT\Payment\Gateway')) {
            // No gateway manager → no real methods (avoid dead balance/alipay stubs).
            return [];
        }

        $methods = [];
        $gw = \AKSRT\Payment\Gateway::get_instance();
        foreach ($ids as $id) {
            $g = $gw->get_gateway($id);
            if (!$g) {
                continue;
            }
            if (method_exists($g, 'is_configured') && !$g->is_configured()) {
                continue;
            }
            $methods[] = [
                'id'   => $id,
                'name' => method_exists($g, 'get_name') ? (string) $g->get_name() : $id,
            ];
        }

        // Do not inject a fake balance/alipay option when nothing is configured —
        // callers should surface “暂无可用支付方式” instead of a dead method.
        return $methods;
    }
}

// ============================================================
// 元数据读取
// ============================================================

if (!function_exists('aksrt_get_pay_meta')) {
    function aksrt_get_pay_meta($post = null): array {
        $p = get_post($post);
        if (!($p instanceof WP_Post)) return aksrt_default_pay_meta();

        $meta = get_post_meta($p->ID, \AKSRT\Core\DomainModel::PAY_META_KEY, true);
        if (is_array($meta) && isset($meta['pay_type'])) {
            return wp_parse_args(\AKSRT\Core\DomainModel::sanitize_pay_meta($meta), aksrt_default_pay_meta());
        }

        return aksrt_default_pay_meta();
    }
}

if (!function_exists('aksrt_default_pay_meta')) {
    function aksrt_default_pay_meta(): array {
        return \AKSRT\Core\DomainModel::default_pay_meta();

        return [
            'pay_type'        => AKSRT_PAY_TYPE_NO,
            'price'           => 0.0,
            'original_price'  => 0.0,
            'vip1_price'      => 0.0,
            'vip2_price'      => 0.0,
            'version'         => '',
            'size'            => '',
            'license'         => '',
            'compat'          => '',
            'demo_url'        => '',
            'downloads'       => [],
            'require_login'   => false,
            'require_captcha' => false,
            'attributes'      => [],
            'gallery'         => [],
            'video_url'       => '',
        ];
    }
}

if (!function_exists('aksrt_is_downloadable_content')) {
    function aksrt_is_downloadable_content($post = null): bool {
        $p = get_post($post);
        if (!($p instanceof WP_Post)) {
            return false;
        }

        $meta = aksrt_get_pay_meta($p);
        if (($meta['pay_type'] ?? AKSRT_PAY_TYPE_NO) !== AKSRT_PAY_TYPE_DOWNLOAD) {
            return false;
        }

        return !empty($meta['downloads']) && is_array($meta['downloads']);
    }
}

if (!function_exists('aksrt_get_download_box_meta')) {
    function aksrt_get_download_box_meta($post = null): array {
        $p = get_post($post);
        if (!($p instanceof WP_Post)) {
            return [];
        }

        if (function_exists('aksrt_get_resource_meta') && function_exists('aksrt_is_resource_post') && aksrt_is_resource_post($p)) {
            $meta = aksrt_get_resource_meta($p);
            $meta['subject_label'] = __('资源', 'aksrt');
            return $meta;
        }

        $pay_meta = aksrt_get_pay_meta($p);
        $download_count = (int) get_post_meta($p->ID, \AKSRT\Core\DomainModel::RESOURCE_DOWNLOAD_COUNT_KEY, true);
        $view_count = (int) get_post_meta($p->ID, \AKSRT\Core\DomainModel::POST_VIEW_COUNT_KEY, true);
        $virtual_sales = max(0, (int) ($pay_meta['virtual_sales'] ?? 0));
        $sales_volume = (int) get_post_meta($p->ID, \AKSRT\Core\DomainModel::RESOURCE_SALES_VOLUME_KEY, true);
        $show_sales = !isset($pay_meta['show_sales']) || !empty($pay_meta['show_sales']);
        $pay_modo = (($pay_meta['pay_modo'] ?? '0') === 'points') ? 'points' : '0';
        $pay_limit = (int) ($pay_meta['pay_limit'] ?? 0);
        if (!in_array($pay_limit, [0, 1, 2], true)) {
            $pay_limit = 0;
        }
        $over_price = max(0.0, (float) ($pay_meta['download_limit_over_price'] ?? 0));

        return [
            'version'         => (string) ($pay_meta['version'] ?? ''),
            'size'            => (string) ($pay_meta['size'] ?? ''),
            'price'           => (float) ($pay_meta['price'] ?? 0),
            'points_price'    => (int) ($pay_meta['points_price'] ?? 0),
            'pay_modo'        => $pay_modo,
            'pay_limit'       => $pay_limit,
            'original_price'  => (float) ($pay_meta['original_price'] ?? 0),
            'vip1_price'      => (float) ($pay_meta['vip1_price'] ?? 0),
            'vip2_price'      => (float) ($pay_meta['vip2_price'] ?? 0),
            'vip1_points'     => (int) ($pay_meta['vip1_points'] ?? 0),
            'vip2_points'     => (int) ($pay_meta['vip2_points'] ?? 0),
            'pay_type'        => (string) ($pay_meta['pay_type'] ?? AKSRT_PAY_TYPE_NO),
            'license'         => (string) ($pay_meta['license'] ?? ''),
            'compat'          => (string) ($pay_meta['compat'] ?? ''),
            'demo_url'        => (string) ($pay_meta['demo_url'] ?? ''),
            'downloads'       => array_values(is_array($pay_meta['downloads'] ?? null) ? $pay_meta['downloads'] : []),
            'download_count'  => max(0, $download_count),
            'view_count'      => max(0, $view_count),
            'virtual_sales'   => $virtual_sales,
            'sales_volume'    => max(0, $sales_volume),
            // Zibll: virtual (pay_cuont) + real sales_volume; fall back to downloads when no sales yet.
            'sales_count'     => $show_sales ? ($virtual_sales + max(0, $sales_volume, $download_count)) : 0,
            'show_sales'      => $show_sales,
            'download_limit_over_price' => $over_price,
            'require_login'   => !empty($pay_meta['require_login']),
            'require_captcha' => !empty($pay_meta['require_captcha']),
            'subject_label'   => __('内容', 'aksrt'),
        ];
    }
}

/**
 * Latest paid content order for a user/post (resource product_type).
 *
 * @return array<string,mixed>|null
 */
if (!function_exists('aksrt_get_user_content_paid_order')) {
    function aksrt_get_user_content_paid_order(int $post_id, int $user_id = 0): ?array {
        $uid = $user_id > 0 ? $user_id : get_current_user_id();
        if ($uid <= 0 || $post_id <= 0 || !class_exists('\AKSRT\Payment\OrderRepository')) {
            return null;
        }
        $orders = \AKSRT\Payment\OrderRepository::get_instance()->get_user_orders($uid, [
            'product_type' => \AKSRT\Core\DomainModel::ORDER_PRODUCT_RESOURCE,
            'status' => '',
            'limit' => 20,
            'offset' => 0,
        ]);
        foreach ($orders as $order) {
            if ((int) ($order['product_id'] ?? 0) !== $post_id) {
                continue;
            }
            $status = (string) ($order['status'] ?? '');
            if (\AKSRT\Core\DomainModel::is_paid_order_status($status)) {
                return $order;
            }
        }
        return null;
    }
}

/**
 * Increment real sales volume for a paid content post (idempotent per order via order meta note flag optional).
 */
if (!function_exists('aksrt_bump_content_sales_volume')) {
    function aksrt_bump_content_sales_volume(int $post_id, int $delta = 1): int {
        if ($post_id <= 0 || $delta === 0) {
            return 0;
        }
        $key = \AKSRT\Core\DomainModel::RESOURCE_SALES_VOLUME_KEY;
        $cur = (int) get_post_meta($post_id, $key, true);
        $next = max(0, $cur + $delta);
        update_post_meta($post_id, $key, $next);
        return $next;
    }
}

/**
 * Whether guest cash purchase is allowed (Zibll pay_no_logged_in + pay_limit=0).
 */
if (!function_exists('aksrt_allow_guest_content_pay')) {
    function aksrt_allow_guest_content_pay($post = null): bool {
        $p = get_post($post);
        if (!($p instanceof WP_Post)) {
            return false;
        }
        $meta = function_exists('aksrt_get_pay_meta') ? aksrt_get_pay_meta($p) : [];
        $pay_limit = (int) ($meta['pay_limit'] ?? 0);
        if ($pay_limit > 0) {
            return false;
        }
        $pay_modo = (($meta['pay_modo'] ?? '0') === 'points') ? 'points' : '0';
        if ($pay_modo === 'points') {
            return false; // points require login
        }
        $order = class_exists('\AKSRT\Settings\Settings') ? \AKSRT\Settings\Settings::get_order_settings() : [];
        $paid  = class_exists('\AKSRT\Settings\Settings') ? \AKSRT\Settings\Settings::get_paid_content_settings() : [];
        $allow = !empty($order['no_logged_in']) || !empty($paid['no_logged_in']);
        /**
         * Filter guest content pay allow.
         *
         * @param bool    $allow
         * @param WP_Post $p
         */
        return (bool) apply_filters('aksrt_allow_guest_content_pay', $allow, $p);
    }
}

/**
 * Cookie lifetime days for guest paid content (Zibll pay_cookie_day).
 */
if (!function_exists('aksrt_guest_pay_cookie_days')) {
    function aksrt_guest_pay_cookie_days(int $post_id = 0): int {
        $days = 15;
        if (class_exists('\AKSRT\Settings\Settings')) {
            $order = \AKSRT\Settings\Settings::get_order_settings();
            $days = max(1, min(31, (int) ($order['cookie_day'] ?? 15)));
        }
        /**
         * @param int $days
         * @param int $post_id
         */
        return max(1, (int) apply_filters('aksrt_guest_pay_cookie_days', $days, $post_id));
    }
}

/**
 * Client IP helper for cookie token binding.
 */
if (!function_exists('aksrt_pay_client_ip')) {
    function aksrt_pay_client_ip(): string {
        if (function_exists('aksrt_get_client_ip')) {
            return (string) aksrt_get_client_ip();
        }
        return (string) ($_SERVER['REMOTE_ADDR'] ?? '');
    }
}

/**
 * Build token material for guest order cookie (zibll-style).
 *
 * @param array<string,mixed> $order
 */
if (!function_exists('aksrt_content_order_cookie_token_key')) {
    function aksrt_content_order_cookie_token_key(array $order): string {
        $meta = is_array($order['meta_payload'] ?? null) ? $order['meta_payload'] : [];
        $ip = (string) ($meta['ip_address'] ?? $order['ip_address'] ?? '');
        $id = (string) ($order['id'] ?? $order['order_number'] ?? '');
        $post_id = (int) ($order['product_id'] ?? $meta['post_id'] ?? 0);
        $num = (string) ($order['order_number'] ?? '');
        $amount = function_exists('aksrt_format_price')
            ? aksrt_format_price((float) ($order['amount'] ?? 0))
            : (string) round((float) ($order['amount'] ?? 0), 2);
        return $id . '_' . $post_id . '_' . trim($num) . '_' . $amount . '_' . trim($ip);
    }
}

/**
 * Whether guest cash purchase is allowed for forum topic / plate follow.
 * Reuses global pay_no_logged_in (same switch as content).
 *
 * @param WP_Post|int|null $post Topic or plate post (optional filter context).
 */
if (!function_exists('aksrt_allow_guest_forum_pay')) {
    function aksrt_allow_guest_forum_pay($post = null): bool {
        $order = class_exists('\AKSRT\Settings\Settings') ? \AKSRT\Settings\Settings::get_order_settings() : [];
        $paid  = class_exists('\AKSRT\Settings\Settings') ? \AKSRT\Settings\Settings::get_paid_content_settings() : [];
        $allow = !empty($order['no_logged_in']) || !empty($paid['no_logged_in']);
        /**
         * @param bool             $allow
         * @param WP_Post|int|null $post
         */
        return (bool) apply_filters('aksrt_allow_guest_forum_pay', $allow, $post);
    }
}

/**
 * Set guest paid cookies after cash order paid (content / topic / plate_follow).
 *
 * @param array<string,mixed> $order
 */
if (!function_exists('aksrt_set_guest_pay_cookies')) {
    function aksrt_set_guest_pay_cookies(array $order): void {
        $post_id = (int) ($order['product_id'] ?? 0);
        $order_number = (string) ($order['order_number'] ?? '');
        if ($post_id <= 0 || $order_number === '') {
            return;
        }
        $days = aksrt_guest_pay_cookie_days($post_id);
        $expire = time() + (DAY_IN_SECONDS * $days);
        $path = defined('COOKIEPATH') && COOKIEPATH ? COOKIEPATH : '/';
        $domain = defined('COOKIE_DOMAIN') ? COOKIE_DOMAIN : '';
        $secure = is_ssl();
        $httponly = true;

        setcookie('aksrt_pay_' . $post_id, $order_number, $expire, $path, $domain, $secure, $httponly);
        $_COOKIE['aksrt_pay_' . $post_id] = $order_number;

        $token = md5(aksrt_content_order_cookie_token_key($order));
        $token_name = 'aksrt_pay_token_' . md5($order_number);
        setcookie($token_name, $token, $expire, $path, $domain, $secure, $httponly);
        $_COOKIE[$token_name] = $token;
    }
}

/**
 * Set guest paid cookies after content order paid (Zibll zibpay_posts_order_created_set_cookie).
 *
 * @param array<string,mixed> $order
 */
if (!function_exists('aksrt_set_guest_content_pay_cookies')) {
    function aksrt_set_guest_content_pay_cookies(array $order): void {
        aksrt_set_guest_pay_cookies($order);
    }
}

/**
 * Resolve guest paid order from browser cookie for a product.
 *
 * @return array<string,mixed>|null
 */
if (!function_exists('aksrt_get_guest_paid_order')) {
    function aksrt_get_guest_paid_order(int $product_id, string $product_type = ''): ?array {
        if ($product_id <= 0 || empty($_COOKIE['aksrt_pay_' . $product_id])) {
            return null;
        }
        if (!class_exists('\AKSRT\Payment\OrderRepository') || !class_exists('\AKSRT\Core\DomainModel')) {
            return null;
        }
        $order_number = sanitize_text_field((string) $_COOKIE['aksrt_pay_' . $product_id]);
        if ($order_number === '') {
            return null;
        }
        $order = \AKSRT\Payment\OrderRepository::get_instance()->get($order_number);
        if (!$order) {
            return null;
        }
        $ptype = sanitize_key((string) ($order['product_type'] ?? ''));
        $want = sanitize_key($product_type);
        if ($want !== '' && $ptype !== $want) {
            return null;
        }
        if ((int) ($order['product_id'] ?? 0) !== $product_id) {
            return null;
        }
        // Guest orders only (logged-in users use user_id access).
        if ((int) ($order['user_id'] ?? -1) !== 0) {
            return null;
        }
        $status = (string) ($order['status'] ?? '');
        if (!\AKSRT\Core\DomainModel::is_paid_order_status($status)) {
            return null;
        }

        $paid_at = (string) ($order['paid_at'] ?? $order['created_at'] ?? '');
        if ($paid_at !== '') {
            $ts = strtotime($paid_at);
            $days = aksrt_guest_pay_cookie_days($product_id);
            if ($ts !== false && ($ts + DAY_IN_SECONDS * $days) < time()) {
                return null;
            }
        }

        $token_name = 'aksrt_pay_token_' . md5($order_number);
        $cookie_token = isset($_COOKIE[$token_name]) ? (string) $_COOKIE[$token_name] : '';
        $expect = md5(aksrt_content_order_cookie_token_key($order));
        if ($cookie_token === '' || !hash_equals($expect, $cookie_token)) {
            return null;
        }

        return $order;
    }
}

/**
 * Resolve guest paid order from browser cookie for a post (content/resource).
 *
 * @return array<string,mixed>|null
 */
if (!function_exists('aksrt_get_guest_content_paid_order')) {
    function aksrt_get_guest_content_paid_order(int $post_id): ?array {
        $type = class_exists('\AKSRT\Core\DomainModel')
            ? \AKSRT\Core\DomainModel::ORDER_PRODUCT_RESOURCE
            : 'resource';
        return aksrt_get_guest_paid_order($post_id, $type);
    }
}

/**
 * Whether current request has paid access via guest cookie (content/resource product).
 */
if (!function_exists('aksrt_guest_has_paid_access')) {
    function aksrt_guest_has_paid_access(int $post_id): bool {
        return null !== aksrt_get_guest_content_paid_order($post_id);
    }
}

/**
 * Guest paid plate follow access (cookie).
 */
if (!function_exists('aksrt_guest_has_plate_follow_access')) {
    function aksrt_guest_has_plate_follow_access(int $plate_id): bool {
        $type = class_exists('\AKSRT\Core\DomainModel')
            ? \AKSRT\Core\DomainModel::ORDER_PRODUCT_PLATE_FOLLOW
            : 'plate_follow';
        return null !== aksrt_get_guest_paid_order($plate_id, $type);
    }
}

/**
 * Resolve the amount a given user should pay for a post (Zibll VIP tier min).
 *
 * VIP tier prices only apply when configured as a positive discount (< base).
 * Full free for VIP uses vip_free_download / exempt roles (handled separately).
 *
 * @param int|WP_Post|null $post
 * @param int              $user_id
 * @return array{amount:float,base:float,vip_amount:float,modo:string,currency:string,is_free:bool,pay_limit:int,vip_level:int,original:float,vip1:float,vip2:float}
 */
if (!function_exists('aksrt_get_user_pay_price')) {
    function aksrt_get_user_pay_price($post = null, int $user_id = 0): array {
        $meta = function_exists('aksrt_get_pay_meta') ? aksrt_get_pay_meta($post) : \AKSRT\Core\DomainModel::default_pay_meta();
        $pay_modo = (($meta['pay_modo'] ?? '0') === 'points') ? 'points' : '0';
        $pay_limit = (int) ($meta['pay_limit'] ?? 0);
        if (!in_array($pay_limit, [0, 1, 2], true)) {
            $pay_limit = 0;
        }

        $uid = $user_id > 0 ? $user_id : (function_exists('get_current_user_id') ? (int) get_current_user_id() : 0);
        $vip_level = 0;
        if ($uid > 0 && function_exists('aksrt_get_user_vip_level')) {
            $vip_level = (int) aksrt_get_user_vip_level($uid);
        }
        if ($uid > 0 && function_exists('aksrt_is_vip_exempt') && aksrt_is_vip_exempt($uid)) {
            $vip_level = max($vip_level, 2);
        }

        $currency = class_exists('\AKSRT\Settings\Settings') ? \AKSRT\Settings\Settings::get_currency_name() : __('积分', 'aksrt');
        $cash_symbol = '￥';
        if (class_exists('\AKSRT\Settings\Settings')) {
            $paid = \AKSRT\Settings\Settings::get_paid_content_settings();
            $cash_symbol = (string) ($paid['display']['currency_symbol'] ?? '￥');
        }

        if ($pay_modo === 'points') {
            $base = (float) ($meta['points_price'] ?? 0);
            $vip1 = (float) ($meta['vip1_points'] ?? 0);
            $vip2 = (float) ($meta['vip2_points'] ?? 0);
            $currency_label = $currency;
        } else {
            $base = (float) ($meta['price'] ?? 0);
            $vip1 = (float) ($meta['vip1_price'] ?? 0);
            $vip2 = (float) ($meta['vip2_price'] ?? 0);
            $currency_label = $cash_symbol;
        }

        // Positive VIP tier prices only (0 defaults mean "not configured").
        $vip_amount = -1.0;
        if ($vip_level >= 2 && $vip2 > 0) {
            $vip_amount = $vip2;
        } elseif ($vip_level >= 1 && $vip1 > 0) {
            $vip_amount = $vip1;
        }

        $amount = $base;
        if ($vip_amount >= 0 && ($base <= 0 || $vip_amount < $base)) {
            $amount = $vip_amount;
        }

        // Role/VIP free-download exemption (global setting).
        if ($amount > 0 && $uid > 0 && function_exists('aksrt_is_download_credit_exempt_user') && aksrt_is_download_credit_exempt_user($uid)) {
            $amount = 0.0;
        }

        $original = (float) ($meta['original_price'] ?? 0);

        return [
            'amount'     => max(0.0, (float) $amount),
            'base'       => max(0.0, (float) $base),
            'vip_amount' => $vip_amount >= 0 ? max(0.0, (float) $vip_amount) : -1.0,
            'modo'       => $pay_modo,
            'currency'   => $currency_label,
            'is_free'    => $amount <= 0,
            'pay_limit'  => $pay_limit,
            'vip_level'  => $vip_level,
            'original'   => $original,
            'vip1'       => max(0.0, (float) $vip1),
            'vip2'       => max(0.0, (float) $vip2),
        ];
    }
}

/**
 * Whether content cashier may accept coupons for this post (zibll coupon_post_s || coupon_s).
 */
if (!function_exists('aksrt_is_content_coupon_allowed')) {
    function aksrt_is_content_coupon_allowed($post = null): bool {
        $meta = function_exists('aksrt_get_pay_meta') ? aksrt_get_pay_meta($post) : [];
        if (!empty($meta['coupon_s'])) {
            return true;
        }
        if (class_exists('\AKSRT\Settings\Settings') && method_exists('\AKSRT\Settings\Settings', 'get_content_coupon_settings')) {
            $cfg = \AKSRT\Settings\Settings::get_content_coupon_settings();
            return !empty($cfg['enabled']);
        }
        if (class_exists('\AKSRT\Settings\Settings') && method_exists('\AKSRT\Settings\Settings', 'get_paid_content_settings')) {
            $paid = \AKSRT\Settings\Settings::get_paid_content_settings();
            return !empty($paid['coupon_post_s']);
        }
        return false;
    }
}

/**
 * Buyer-facing 推广折扣 amount for a post (0 if no eligible referrer).
 * Cash only; mirrors zibpay_get_post_rebate_discount.
 */
if (!function_exists('aksrt_get_post_rebate_discount')) {
    function aksrt_get_post_rebate_discount($post = null, int $user_id = 0): float {
        $meta = function_exists('aksrt_get_pay_meta') ? aksrt_get_pay_meta($post) : [];
        $fixed = max(0.0, (float) ($meta['pay_rebate_discount'] ?? 0));
        if ($fixed <= 0) {
            return 0.0;
        }
        if (!class_exists('\AKSRT\Settings\Settings') || !method_exists('\AKSRT\Settings\Settings', 'get_payment_affiliate_settings')) {
            return 0.0;
        }
        $aff = \AKSRT\Settings\Settings::get_payment_affiliate_settings();
        if (empty($aff['enabled'])) {
            return 0.0;
        }
        $uid = $user_id > 0 ? $user_id : (function_exists('get_current_user_id') ? (int) get_current_user_id() : 0);
        $referrer_id = 0;
        if (class_exists('\AKSRT\Credits\Invite') && method_exists(\AKSRT\Credits\Invite::get_instance(), 'get_referrer')) {
            $referrer_id = (int) \AKSRT\Credits\Invite::get_instance()->get_referrer($uid);
        }
        if ($referrer_id <= 0) {
            return 0.0;
        }
        // Need a positive ratio for referrer (VIP tier of referrer preferred).
        $ratio = (int) ($aff['ratio'] ?? 0);
        $user_ratio = is_array($aff['user_ratio'] ?? null) ? $aff['user_ratio'] : [];
        $ref_vip = 0;
        if (function_exists('aksrt_get_user_vip_level')) {
            $ref_vip = (int) aksrt_get_user_vip_level($referrer_id);
        }
        if ($ref_vip >= 2 && !empty($user_ratio['vip2'])) {
            $ratio = (int) $user_ratio['vip2'];
        } elseif ($ref_vip >= 1 && !empty($user_ratio['vip1'])) {
            $ratio = (int) $user_ratio['vip1'];
        } elseif (isset($user_ratio['user'])) {
            $ratio = (int) $user_ratio['user'];
        }
        if ($ratio <= 0) {
            return 0.0;
        }
        return round($fixed, 2);
    }
}

/**
 * Whether cash checkout may use points deduction (zibll points_deduction).
 *
 * zibll: zibpay_is_allow_points_deduction() always returns false ("暂未启用").
 * Keep the same contract: schema/UI may exist, runtime is hard-off unless filter overrides.
 */
if (!function_exists('aksrt_is_allow_points_deduction')) {
    function aksrt_is_allow_points_deduction(string $context = 'content'): bool {
        // Mirror zibll hard-off first.
        $allowed = false;
        if (class_exists('\AKSRT\Settings\Settings') && method_exists('\AKSRT\Settings\Settings', 'get_all')) {
            $all = \AKSRT\Settings\Settings::get_all();
            // Even if switch on, default remains false like zibll until product enables it.
            if (!empty($all['points_deduction_s']) && class_exists('\AKSRT\Settings\Settings') && method_exists('\AKSRT\Settings\Settings', 'credits_enabled') && \AKSRT\Settings\Settings::credits_enabled()) {
                $allowed = false; // still disabled at runtime
            }
        }
        return (bool) apply_filters('aksrt_is_allow_points_deduction', $allowed, $context);
    }
}

/**
 * Content cashier does not accept card_pass payment_method.
 * Card-pass for balance/VIP/points is user-center redeem (zibll order types 4/8/9),
 * not content pay types (reading/download/gallery/video).
 */
if (!function_exists('aksrt_is_content_card_pass_pay_allowed')) {
    function aksrt_is_content_card_pass_pay_allowed($post = null): bool {
        return (bool) apply_filters('aksrt_is_content_card_pass_pay_allowed', false, $post);
    }
}

// ============================================================
// 状态判断
// ============================================================

if (!function_exists('aksrt_is_paid_post')) {
    function aksrt_is_paid_post($post = null): bool {
        return aksrt_get_pay_meta($post)['pay_type'] !== AKSRT_PAY_TYPE_NO;
    }
}

if (!function_exists('aksrt_is_paid_reading')) {
    function aksrt_is_paid_reading($post = null): bool {
        return aksrt_get_pay_meta($post)['pay_type'] === AKSRT_PAY_TYPE_READING;
    }
}

if (!function_exists('aksrt_is_paid_download')) {
    function aksrt_is_paid_download($post = null): bool {
        return aksrt_get_pay_meta($post)['pay_type'] === AKSRT_PAY_TYPE_DOWNLOAD;
    }
}

if (!function_exists('aksrt_is_paid_gallery')) {
    function aksrt_is_paid_gallery($post = null): bool {
        return aksrt_get_pay_meta($post)['pay_type'] === AKSRT_PAY_TYPE_GALLERY;
    }
}

if (!function_exists('aksrt_is_paid_video')) {
    function aksrt_is_paid_video($post = null): bool {
        return aksrt_get_pay_meta($post)['pay_type'] === AKSRT_PAY_TYPE_VIDEO;
    }
}

if (!function_exists('aksrt_is_vip_only')) {
    function aksrt_is_vip_only($post = null): bool {
        return aksrt_get_pay_meta($post)['pay_type'] === AKSRT_PAY_TYPE_VIP;
    }
}

// ============================================================
// 付费状态检查
// ============================================================

if (!function_exists('aksrt_has_paid_access')) {
    function aksrt_has_paid_access($post = null, int $user_id = 0): bool {
        $p = get_post($post);
        if (!($p instanceof WP_Post)) return true;

        // 单一真相：付费访问由 \AKSRT\Content\Visibility（基于订单 + VIP）裁决。
        if (class_exists('\AKSRT\Content\Visibility')) {
            $state = \AKSRT\Content\Visibility::get_post_access_state($p, $user_id);
            return !empty($state['has_paid_access']);
        }

        // 兜底：仅在 service 不可用时使用，避免离线环境直接拒绝。
        $meta = aksrt_get_pay_meta($p);
        if ($meta['pay_type'] === AKSRT_PAY_TYPE_NO) return true;
        if ((float) $meta['price'] <= 0 && $meta['pay_type'] !== AKSRT_PAY_TYPE_VIP) return true;

        $uid = $user_id > 0 ? $user_id : get_current_user_id();

        if ($uid > 0 && function_exists('aksrt_is_vip_exempt') && aksrt_is_vip_exempt($uid)) return true;
        if ($uid > 0 && get_user_meta($uid, '_aksrt_paid_' . $p->ID, true)) return true;

        return false;
    }
}

if (!function_exists('aksrt_can_access_content')) {
    function aksrt_can_access_content($post = null): bool {
        $p = get_post($post);
        if (!($p instanceof WP_Post)) return true;

        if (class_exists('\AKSRT\Content\Visibility')) {
            return \AKSRT\Content\Visibility::can_view_paid_content($p);
        }

        $pay_type = aksrt_get_pay_meta($p)['pay_type'];
        if ($pay_type === AKSRT_PAY_TYPE_NO) return true;

        // 只有 reading/gallery/video 需要隐藏内容
        if (!in_array($pay_type, [AKSRT_PAY_TYPE_READING, AKSRT_PAY_TYPE_GALLERY, AKSRT_PAY_TYPE_VIDEO], true)) {
            return true;
        }

        return aksrt_has_paid_access($p);
    }
}

if (!function_exists('aksrt_can_download')) {
    /**
     * 下载授权门禁 —— 单一合同。
     *
     * 实际判定交给 \AKSRT\Content\Visibility::can_download_resource()。
     * 不再使用 download_credit 做按次扣积分门禁。
     *
     * @param int|WP_Post|null $post
     * @param int              $user_id 0 表示当前用户
     * @return true|WP_Error
     */
    function aksrt_can_download($post = null, int $user_id = 0) {
        if (class_exists('\AKSRT\Content\Visibility')) {
            return \AKSRT\Content\Visibility::can_download_resource($post, $user_id);
        }

        $p = get_post($post);
        if (!($p instanceof WP_Post)) {
            return new WP_Error('aksrt_invalid', __('无效内容。', 'aksrt'));
        }

        $meta = aksrt_get_pay_meta($p);
        if (($meta['pay_type'] ?? '') !== AKSRT_PAY_TYPE_DOWNLOAD) {
            return new WP_Error('aksrt_not_downloadable', __('该内容不是可下载资源。', 'aksrt'));
        }

        $paid_settings = class_exists('\AKSRT\Settings\Settings')
            ? \AKSRT\Settings\Settings::get_paid_content_settings()
            : ['download_login' => true];

        $uid = $user_id > 0 ? $user_id : get_current_user_id();

        if (!empty($paid_settings['download_login']) && $uid <= 0) {
            $login_url = wp_login_url(get_permalink($p));
            return new WP_Error('aksrt_need_login', __('请先登录。', 'aksrt'), ['login_url' => $login_url]);
        }

        if ($uid > 0 && function_exists('aksrt_has_paid_access') && aksrt_has_paid_access($p, $uid)) {
            return true;
        }
        if ($uid > 0 && function_exists('aksrt_is_vip_exempt') && aksrt_is_vip_exempt($uid)) {
            return true;
        }

        // Fallback without Content_Visibility: require purchase when priced.
        $cost = function_exists('aksrt_get_download_cost') ? aksrt_get_download_cost($p) : 0;
        if ($cost > 0) {
            return new WP_Error('aksrt_need_purchase', __('请先购买后再下载。', 'aksrt'), [
                'status' => 402,
                'cost'   => $cost,
                'post_id'=> (int) $p->ID,
            ]);
        }

        return true;
    }
}

if (!function_exists('aksrt_get_download_cost')) {
    function aksrt_get_download_cost($post = null): int {
        if (function_exists('aksrt_resource_download_cost')) {
            return (int) aksrt_resource_download_cost($post);
        }

        $meta = aksrt_get_pay_meta($post);
        return (int) ceil((float) $meta['price']);
    }
}

/**
 * URL of the Zibll-style single-post download page (page template + ?post=ID).
 */
if (!function_exists('aksrt_get_single_download_page_url')) {
    function aksrt_get_single_download_page_url($post = null): string {
        $p = get_post($post);
        if (!($p instanceof WP_Post)) {
            return '';
        }

        $page_url = '';
        if (function_exists('aksrt_find_template_page')) {
            $page = aksrt_find_template_page('templates/pages/page-download-file.php');
            if ($page instanceof WP_Post) {
                $page_url = get_permalink($page);
            }
        }
        if ($page_url === '') {
            // Fallback: look for any page using the template via slug convention.
            $page_url = home_url('/download-file/');
        }

        return add_query_arg('post', (int) $p->ID, $page_url);
    }
}

/**
 * Whether independent download page mode is enabled (Zibll down_alone_page).
 */
if (!function_exists('aksrt_is_download_alone_page_enabled')) {
    function aksrt_is_download_alone_page_enabled(): bool {
        if (!class_exists('\AKSRT\Settings\Settings')) {
            return false;
        }
        $paid = \AKSRT\Settings\Settings::get_paid_content_settings();
        return !empty($paid['down_alone_page']) || !empty($paid['download']['alone_page']);
    }
}

// ============================================================
// 价格显示
// ============================================================

if (!function_exists('aksrt_get_pay_price_label')) {
    function aksrt_get_pay_price_label($post = null): array {
        $meta = aksrt_get_pay_meta($post);
        $priced = function_exists('aksrt_get_user_pay_price')
            ? aksrt_get_user_pay_price($post)
            : null;
        $pay_modo = is_array($priced)
            ? ((($priced['modo'] ?? '0') === 'points') ? 'points' : '0')
            : ((($meta['pay_modo'] ?? '0') === 'points') ? 'points' : '0');
        $pay_limit = is_array($priced)
            ? (int) ($priced['pay_limit'] ?? 0)
            : (int) ($meta['pay_limit'] ?? 0);
        $vip_level = is_array($priced) ? (int) ($priced['vip_level'] ?? 0) : 0;
        $currency = class_exists('\AKSRT\Settings\Settings') ? \AKSRT\Settings\Settings::get_currency_name() : __('积分', 'aksrt');
        $cash_symbol = '￥';
        if (class_exists('\AKSRT\Settings\Settings')) {
            $paid = \AKSRT\Settings\Settings::get_paid_content_settings();
            $cash_symbol = (string) ($paid['display']['currency_symbol'] ?? '￥');
        }

        // pay_type VIP-only or pay_limit not met → member-exclusive badge.
        $member_blocked = ($meta['pay_type'] === AKSRT_PAY_TYPE_VIP)
            || ($pay_limit > 0 && $vip_level < $pay_limit);
        if ($member_blocked) {
            return [
                'text' => __('会员专属', 'aksrt'),
                'free' => false,
                'amount' => 0,
                'base' => is_array($priced) ? (float) ($priced['base'] ?? 0) : 0,
                'modo' => $pay_modo,
                'pay_limit' => $pay_limit,
            ];
        }

        $price = is_array($priced)
            ? (float) ($priced['amount'] ?? 0)
            : ($pay_modo === 'points' ? (float) ($meta['points_price'] ?? 0) : (float) ($meta['price'] ?? 0));
        $base = is_array($priced) ? (float) ($priced['base'] ?? $price) : $price;

        if ($price <= 0) {
            return [
                'text' => __('免费', 'aksrt'),
                'free' => true,
                'amount' => 0,
                'base' => $base,
                'modo' => $pay_modo,
                'pay_limit' => $pay_limit,
            ];
        }

        if ($pay_modo === 'points') {
            return [
                'text' => sprintf(__('%s %s', 'aksrt'), aksrt_format_price($price), $currency),
                'free' => false,
                'amount' => $price,
                'base' => $base,
                'modo' => 'points',
                'pay_limit' => $pay_limit,
            ];
        }

        return [
            'text' => $cash_symbol . aksrt_format_price($price),
            'free' => false,
            'amount' => $price,
            'base' => $base,
            'modo' => '0',
            'pay_limit' => $pay_limit,
        ];
    }
}

if (!function_exists('aksrt_format_price')) {
    function aksrt_format_price(float $price): string {
        if (fmod($price, 1.0) === 0.0) return (string) (int) $price;
        return rtrim(rtrim(number_format($price, 2, '.', ''), '0'), '.');
    }
}

// ============================================================
// 付费类型徽章
// ============================================================

if (!function_exists('aksrt_get_pay_type_badge')) {
    function aksrt_get_pay_type_badge(string $pay_type): string {
        $badges = [
            AKSRT_PAY_TYPE_READING  => ['label' => __('付费阅读', 'aksrt'), 'color' => '#EF4444', 'icon' => 'fa-lock'],
            AKSRT_PAY_TYPE_DOWNLOAD => ['label' => __('付费下载', 'aksrt'), 'color' => '#F97316', 'icon' => 'fa-download'],
            AKSRT_PAY_TYPE_GALLERY  => ['label' => __('付费图库', 'aksrt'), 'color' => '#10B981', 'icon' => 'fa-images'],
            AKSRT_PAY_TYPE_VIDEO    => ['label' => __('付费视频', 'aksrt'), 'color' => '#8B5CF6', 'icon' => 'fa-play-circle'],
            AKSRT_PAY_TYPE_VIP      => ['label' => __('VIP 专属', 'aksrt'), 'color' => '#3B82F6', 'icon' => 'fa-crown'],
        ];

        if (!isset($badges[$pay_type])) return '';
        $b = $badges[$pay_type];
        return sprintf(
            '<span class="aksrt-pay-badge" style="background:%s"><i class="fas %s"></i> %s</span>',
            esc_attr($b['color']), esc_attr($b['icon']), esc_html($b['label'])
        );
    }
}

/**
 * Zibll zibpay_get_service() — service bullets under pay/download box.
 *
 * @return string HTML list of service items.
 */
if (!function_exists('aksrt_get_pay_service_html')) {
    function aksrt_get_pay_service_html(string $class = 'resource-download-box__guarantee'): string {
        $service = [];
        if (class_exists('\AKSRT\Settings\Settings')) {
            $order = \AKSRT\Settings\Settings::get_order_settings();
            $service = is_array($order['service'] ?? null) ? $order['service'] : [];
        }

        $items = [];
        $text = trim((string) ($service['text'] ?? ''));
        $value = trim((string) ($service['value'] ?? ''));
        $icon = trim((string) ($service['icon'] ?? 'fas fa-check-circle'));
        if ($icon === '') {
            $icon = 'fas fa-check-circle';
        }

        // Support multi-line pay_service textarea (one bullet per line).
        $lines = [];
        if ($text !== '') {
            $lines = preg_split('/\r\n|\r|\n/', $text) ?: [];
        }
        if ($value !== '') {
            $lines[] = $value;
        }
        $lines = array_values(array_filter(array_map('trim', $lines)));

        if ($lines === []) {
            // Defaults aligned with previous hardcoded guarantees.
            $lines = [
                __('安全检测', 'aksrt'),
                __('支持 VIP 权益', 'aksrt'),
                __('支持积分结算', 'aksrt'),
            ];
        }

        $html = '';
        foreach ($lines as $line) {
            $html .= '<span class="' . esc_attr($class) . '">';
            $html .= '<i class="' . esc_attr($icon) . '" aria-hidden="true"></i> ';
            $html .= esc_html($line);
            $html .= '</span>';
        }

        return $html;
    }
}

/**
 * Demo link button (Zibll zibpay_get_demo_link).
 */
if (!function_exists('aksrt_get_demo_link_html')) {
    function aksrt_get_demo_link_html($post = null, string $class = 'resource-download-box__btn btn-outline resource-download-box__btn--demo'): string {
        $p = get_post($post);
        if (!($p instanceof WP_Post)) {
            return '';
        }
        $meta = aksrt_get_pay_meta($p);
        if (($meta['pay_type'] ?? '') !== AKSRT_PAY_TYPE_DOWNLOAD) {
            return '';
        }
        $url = trim((string) ($meta['demo_url'] ?? ''));
        if ($url === '') {
            return '';
        }
        $text = __('查看演示', 'aksrt');
        return sprintf(
            '<a target="_blank" rel="nofollow noopener" href="%s" class="%s"><i class="fas fa-external-link-alt" aria-hidden="true"></i><span>%s</span></a>',
            esc_url($url),
            esc_attr($class),
            esc_html($text)
        );
    }
}

/**
 * Product attributes row (Zibll zibpay_get_product_attributes).
 */
if (!function_exists('aksrt_get_pay_attributes_html')) {
    function aksrt_get_pay_attributes_html($post = null, string $class = 'resource-download-box__attrs'): string {
        $p = get_post($post);
        if (!($p instanceof WP_Post)) {
            return '';
        }
        $meta = aksrt_get_pay_meta($p);
        $attrs = is_array($meta['attributes'] ?? null) ? $meta['attributes'] : [];
        // Built-in version/size/license/compat as attributes when set.
        $builtin = [
            'version' => __('版本', 'aksrt'),
            'size'    => __('大小', 'aksrt'),
            'license' => __('授权', 'aksrt'),
            'compat'  => __('兼容', 'aksrt'),
        ];
        $rows = [];
        foreach ($builtin as $key => $label) {
            $val = trim((string) ($meta[$key] ?? ''));
            if ($val !== '') {
                $rows[] = ['name' => $label, 'value' => $val];
            }
        }
        foreach ($attrs as $row) {
            if (!is_array($row)) {
                continue;
            }
            $name = trim((string) ($row['name'] ?? $row['key'] ?? $row['label'] ?? ''));
            $value = trim((string) ($row['value'] ?? $row['val'] ?? ''));
            if ($name === '' || $value === '') {
                continue;
            }
            $rows[] = ['name' => $name, 'value' => $value];
        }
        if ($rows === []) {
            return '';
        }
        $html = '<ul class="' . esc_attr($class) . '">';
        foreach ($rows as $row) {
            $html .= '<li class="' . esc_attr($class) . '-item">';
            $html .= '<span class="' . esc_attr($class) . '-name">' . esc_html($row['name']) . '</span>';
            $html .= '<span class="' . esc_attr($class) . '-value">' . esc_html($row['value']) . '</span>';
            $html .= '</li>';
        }
        $html .= '</ul>';
        return $html;
    }
}

// ============================================================
// 付费墙 HTML
// ============================================================

if (!function_exists('aksrt_get_paywall_html')) {
    function aksrt_get_paywall_html(WP_Post $post): string {
        $meta = aksrt_get_pay_meta($post);
        $pay_type = $meta['pay_type'];
        $priced = function_exists('aksrt_get_user_pay_price') ? aksrt_get_user_pay_price($post) : null;
        $pay_modo = is_array($priced) ? ((($priced['modo'] ?? '0') === 'points') ? 'points' : '0') : ((($meta['pay_modo'] ?? '0') === 'points') ? 'points' : '0');
        $price = is_array($priced) ? (float) ($priced['amount'] ?? 0) : (float) ($meta['price'] ?? 0);
        $vip_level = is_array($priced) ? (int) ($priced['vip_level'] ?? 0) : 0;
        $currency = class_exists('\AKSRT\Settings\Settings') ? \AKSRT\Settings\Settings::get_currency_name() : __('积分', 'aksrt');
        $cash_symbol = '￥';
        if (class_exists('\AKSRT\Settings\Settings')) {
            $paid = \AKSRT\Settings\Settings::get_paid_content_settings();
            $cash_symbol = (string) ($paid['display']['currency_symbol'] ?? '￥');
        }
        $price_text = $pay_modo === 'points'
            ? (aksrt_format_price($price) . ' ' . $currency)
            : ($cash_symbol . aksrt_format_price($price));

        $type_labels = [
            AKSRT_PAY_TYPE_READING => ['icon' => 'fa-lock', 'label' => __('付费阅读', 'aksrt'), 'desc' => __('付费后即可查看完整内容', 'aksrt')],
            AKSRT_PAY_TYPE_GALLERY => ['icon' => 'fa-images', 'label' => __('付费图库', 'aksrt'), 'desc' => __('付费后即可查看全部图片', 'aksrt')],
            AKSRT_PAY_TYPE_VIDEO   => ['icon' => 'fa-play-circle', 'label' => __('付费视频', 'aksrt'), 'desc' => __('付费后即可观看完整视频', 'aksrt')],
        ];

        $type_info = $type_labels[$pay_type] ?? $type_labels[AKSRT_PAY_TYPE_READING];
        $login_url = function_exists('aksrt_get_login_url') ? aksrt_get_login_url() : wp_login_url(get_permalink($post));
        $is_logged_in = is_user_logged_in();
        $original_price = (float) ($meta['original_price'] ?? 0);
        $has_original = $original_price > 0 && $original_price > $price;
        $pay_limit = (int) ($meta['pay_limit'] ?? 0);
        $member_blocked = $pay_limit > 0 && $vip_level < $pay_limit;
        $vip_url = function_exists('aksrt_get_user_center_tab_url')
            ? aksrt_get_user_center_tab_url('credits')
            : (function_exists('aksrt_get_user_center_url') ? aksrt_get_user_center_url() : home_url('/'));

        ob_start();
        ?>
        <div class="aksrt-paywall" data-post-id="<?php echo esc_attr((string) $post->ID); ?>" data-pay-type="<?php echo esc_attr($pay_type); ?>" data-pay-modo="<?php echo esc_attr($pay_modo); ?>">
            <div class="aksrt-paywall__overlay">
                <div class="aksrt-paywall__blur"></div>
                <div class="aksrt-paywall__card">
                    <div class="aksrt-paywall__icon">
                        <i class="fas <?php echo esc_attr($type_info['icon']); ?>" aria-hidden="true"></i>
                    </div>
                    <h3 class="aksrt-paywall__title"><?php echo esc_html($type_info['label']); ?></h3>
                    <p class="aksrt-paywall__desc"><?php echo esc_html($type_info['desc']); ?></p>
                    <div class="aksrt-paywall__price">
                        <?php if ($member_blocked) : ?>
                            <span class="aksrt-paywall__price-member"><?php esc_html_e('会员专属', 'aksrt'); ?></span>
                        <?php elseif ($price > 0) : ?>
                            <span class="aksrt-paywall__price-amount"><?php echo esc_html($price_text); ?></span>
                            <?php if ($has_original) : ?>
                                <span class="aksrt-paywall__price-original"><?php echo esc_html(($pay_modo === 'points' ? aksrt_format_price($original_price) . ' ' . $currency : $cash_symbol . aksrt_format_price($original_price))); ?></span>
                            <?php endif; ?>
                        <?php else : ?>
                            <span class="aksrt-paywall__price-free"><?php esc_html_e('免费', 'aksrt'); ?></span>
                        <?php endif; ?>
                    </div>
                    <?php if (!$is_logged_in) : ?>
                        <?php if ($pay_limit <= 0 && $price > 0 && $pay_modo !== 'points' && function_exists('aksrt_allow_guest_content_pay') && aksrt_allow_guest_content_pay($post)) : ?>
                            <button type="button" class="but <?php echo $pay_modo === 'points' ? 'jb-yellow' : 'jb-red'; ?> padding-lg cashier-link aksrt-paywall__btn" data-aksrt-pay-content="<?php echo esc_attr((string) $post->ID); ?>">
                                <i class="fa fa-shopping-cart" aria-hidden="true"></i> <?php printf(esc_html__('游客购买（%s）', 'aksrt'), $price_text); ?>
                            </button>
                            <p class="aksrt-paywall__hint" style="margin-top:10px;">
                                <a href="<?php echo esc_url($login_url); ?>"><?php esc_html_e('已有账号？登录后购买', 'aksrt'); ?></a>
                            </p>
                        <?php else : ?>
                        <a href="<?php echo esc_url($login_url); ?>" class="but jb-red padding-lg aksrt-paywall__btn">
                            <i class="fa fa-sign-in" aria-hidden="true"></i> <?php esc_html_e('登录后购买', 'aksrt'); ?>
                        </a>
                        <?php endif; ?>
                    <?php elseif ($member_blocked) : ?>
                        <a href="<?php echo esc_url($vip_url); ?>" class="but jb-vip padding-lg aksrt-paywall__btn">
                            <i class="fas fa-crown" aria-hidden="true"></i> <?php esc_html_e('开通会员后可查看', 'aksrt'); ?>
                        </a>
                    <?php elseif ($price > 0) : ?>
                        <button type="button" class="but <?php echo $pay_modo === 'points' ? 'jb-yellow' : 'jb-red'; ?> padding-lg cashier-link aksrt-paywall__btn" data-aksrt-pay-content="<?php echo esc_attr((string) $post->ID); ?>">
                            <i class="fa fa-shopping-cart" aria-hidden="true"></i> <?php printf(esc_html__('立即购买（%s）', 'aksrt'), $price_text); ?>
                        </button>
                    <?php endif; ?>
                    <p class="aksrt-paywall__hint">
                        <i class="fas fa-shield-alt"></i> <?php esc_html_e('购买后永久有效，支持重复查看', 'aksrt'); ?>
                    </p>
                </div>
            </div>
        </div>
        <?php
        return ob_get_clean();
    }
}

// ============================================================
// 付费墙样式注入
// ============================================================

add_action('wp_head', function (): void {
    if (is_admin() || !is_singular()) return;
    global $post;
    if (!($post instanceof WP_Post)) return;
    if (!function_exists('aksrt_can_access_content') || aksrt_can_access_content($post)) return;
    ?>
    <style>
    .aksrt-paywall{position:relative;margin:24px 0}
    .aksrt-paywall__overlay{position:relative}
    .aksrt-paywall__blur{filter:blur(12px);pointer-events:none;user-select:none;max-height:200px;overflow:hidden;opacity:.3}
    .aksrt-paywall__card{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:var(--surface-1,#fff);border:1px solid var(--color-line,#e5e7eb);border-radius:var(--radius-lg,14px);padding:40px;text-align:center;box-shadow:0 12px 40px rgba(0,0,0,.12);min-width:320px;max-width:420px}
    .aksrt-paywall__icon{font-size:48px;color:var(--color-primary,#f04494);margin-bottom:16px}
    .aksrt-paywall__title{font-size:20px;font-weight:700;margin:0 0 8px;color:var(--color-ink,#15171A)}
    .aksrt-paywall__desc{font-size:14px;color:var(--color-ink-3,#525866);margin:0 0 20px}
    .aksrt-paywall__price{margin-bottom:20px}
    .aksrt-paywall__price-amount{font-size:28px;font-weight:700;color:var(--color-error,#EF4444)}
    .aksrt-paywall__price-original{font-size:14px;color:var(--color-ink-4,#8A8F98);text-decoration:line-through;margin-left:8px}
    .aksrt-paywall__price-free{font-size:20px;font-weight:600;color:var(--color-success,#10B981)}
    .aksrt-paywall__btn{display:inline-flex;align-items:center;gap:8px}
    .aksrt-paywall__hint{font-size:12px;color:var(--color-ink-4,#8A8F98);margin:16px 0 0}
    .aksrt-gallery-locked{filter:blur(8px);pointer-events:none;user-select:none}
    .aksrt-paywall-preview{margin:0 0 16px;padding:14px 16px;border-left:3px solid var(--color-primary,#f04494);background:var(--surface-2,#f8fafc);border-radius:0 10px 10px 0;color:var(--color-ink-2,#374151);line-height:1.7}
    .aksrt-paywall-preview p:last-child{margin-bottom:0}
    .aksrt-paid-gallery__overlay .but,.aksrt-paid-video__placeholder .but{margin-top:10px}
    </style>
    <?php
});

// ============================================================
// 付费图库轮播（Swiper）
// ============================================================

if (!function_exists('aksrt_render_paid_gallery')) {
    function aksrt_render_paid_gallery(WP_Post $post): string {
        $meta = aksrt_get_pay_meta($post);
        if ($meta['pay_type'] !== AKSRT_PAY_TYPE_GALLERY) return '';

        $images = $meta['gallery'] ?? [];
        if (empty($images)) return '';

        $has_access = aksrt_has_paid_access($post);
        $base_uri = get_template_directory_uri();

        ob_start();
        ?>
        <div class="aksrt-paid-gallery" data-post-id="<?php echo esc_attr((string) $post->ID); ?>">
            <?php if ($has_access) : ?>
                <!-- 已付费：Swiper 轮播 -->
                <div class="swiper aksrt-paid-gallery__swiper">
                    <div class="swiper-wrapper">
                        <?php foreach ($images as $img_url) : ?>
                            <div class="swiper-slide">
                                <img src="<?php echo esc_url($img_url); ?>" alt="" loading="lazy">
                            </div>
                        <?php endforeach; ?>
                    </div>
                    <div class="swiper-pagination"></div>
                    <div class="swiper-button-prev"></div>
                    <div class="swiper-button-next"></div>
                </div>
            <?php else : ?>
                <!-- 未付费：仅首图模糊预览，不输出完整图库 URL 列表 -->
                <div class="aksrt-paid-gallery__locked">
                    <div class="aksrt-paid-gallery__preview">
                        <img src="<?php echo esc_url((string) $images[0]); ?>" alt="" class="aksrt-gallery-locked" loading="lazy">
                    </div>
                    <div class="aksrt-paid-gallery__overlay">
                        <i class="fas fa-images" aria-hidden="true"></i>
                        <p><?php
                            printf(
                                /* translators: %d: image count */
                                esc_html__('共 %d 张图片，付费后可查看', 'aksrt'),
                                count($images)
                            );
                        ?></p>
                        <?php $price_label = function_exists('aksrt_get_pay_price_label') ? aksrt_get_pay_price_label($post) : ['text' => '']; ?>
                        <?php if (!empty($price_label['text'])) : ?>
                            <span class="aksrt-paid-gallery__price"><?php echo esc_html((string) $price_label['text']); ?></span>
                        <?php endif; ?>
                        <button type="button" class="but jb-red padding-lg cashier-link" data-aksrt-pay-content="<?php echo esc_attr((string) $post->ID); ?>">
                            <i class="fa fa-shopping-cart" aria-hidden="true"></i> <?php esc_html_e('立即购买', 'aksrt'); ?>
                        </button>
                    </div>
                </div>
            <?php endif; ?>
        </div>

        <?php if ($has_access) : ?>
        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.css">
        <script src="https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js"></script>
        <script>
        document.addEventListener('DOMContentLoaded', function() {
            new Swiper('.aksrt-paid-gallery__swiper', {
                loop: true,
                pagination: { el: '.swiper-pagination', clickable: true },
                navigation: { nextEl: '.swiper-button-next', prevEl: '.swiper-button-prev' },
                lazy: true,
            });
        });
        </script>
        <?php endif; ?>
        <?php
        return ob_get_clean();
    }
}

// ============================================================
// 付费视频播放器
// ============================================================

if (!function_exists('aksrt_render_paid_video')) {
    function aksrt_render_paid_video(WP_Post $post): string {
        $meta = aksrt_get_pay_meta($post);
        if ($meta['pay_type'] !== AKSRT_PAY_TYPE_VIDEO) return '';

        $video_url = $meta['video_url'] ?? '';
        if (empty($video_url)) return '';

        $has_access = aksrt_has_paid_access($post);

        ob_start();
        ?>
        <div class="aksrt-paid-video" data-post-id="<?php echo esc_attr((string) $post->ID); ?>">
            <?php if ($has_access) : ?>
                <!-- 已付费：视频播放器 -->
                <div class="aksrt-paid-video__player">
                    <?php if (preg_match('/\.(mp4|webm|ogg)$/i', $video_url)) : ?>
                        <video controls preload="metadata" style="width:100%;border-radius:var(--radius-lg);">
                            <source src="<?php echo esc_url($video_url); ?>">
                            <?php esc_html_e('您的浏览器不支持视频播放。', 'aksrt'); ?>
                        </video>
                    <?php else : ?>
                        <div class="aksrt-paid-video__embed">
                            <iframe src="<?php echo esc_url($video_url); ?>" frameborder="0" allowfullscreen></iframe>
                        </div>
                    <?php endif; ?>
                </div>
            <?php else : ?>
                <!-- 未付费：锁定预览（不输出真实视频地址） -->
                <div class="aksrt-paid-video__locked">
                    <div class="aksrt-paid-video__placeholder">
                        <i class="fas fa-play-circle" aria-hidden="true"></i>
                        <p><?php esc_html_e('付费后即可观看完整视频', 'aksrt'); ?></p>
                        <?php $price_label = function_exists('aksrt_get_pay_price_label') ? aksrt_get_pay_price_label($post) : ['text' => '']; ?>
                        <?php if (!empty($price_label['text'])) : ?>
                            <span class="aksrt-paid-video__price"><?php echo esc_html((string) $price_label['text']); ?></span>
                        <?php endif; ?>
                        <p style="margin-top:14px;">
                            <button type="button" class="but jb-red padding-lg cashier-link" data-aksrt-pay-content="<?php echo esc_attr((string) $post->ID); ?>">
                                <i class="fa fa-shopping-cart" aria-hidden="true"></i> <?php esc_html_e('立即购买', 'aksrt'); ?>
                            </button>
                        </p>
                    </div>
                </div>
            <?php endif; ?>
        </div>
        <?php
        return ob_get_clean();
    }
}

// ============================================================
// 内容过滤钩子（注册在 core-hooks.php）
// ============================================================

// 这些函数供 core-hooks.php 中的 the_content 过滤器调用
if (!function_exists('aksrt_paid_content_filter')) {
    function aksrt_paid_content_filter(string $content): string {
        if (is_admin() || !is_singular() || !in_the_loop() || !is_main_query()) {
            return $content;
        }
        global $post;
        if (!($post instanceof WP_Post)) {
            return $content;
        }
        if (aksrt_can_access_content($post)) {
            return $content;
        }

        $meta = aksrt_get_pay_meta($post);
        $pay_type = (string) ($meta['pay_type'] ?? AKSRT_PAY_TYPE_NO);
        if (!in_array($pay_type, [AKSRT_PAY_TYPE_READING, AKSRT_PAY_TYPE_GALLERY, AKSRT_PAY_TYPE_VIDEO], true)) {
            return $content;
        }

        // free_preview teaser + paywall. Never render full gallery/video media when unpaid.
        $preview = trim((string) ($meta['free_preview'] ?? ''));
        $out = '';
        if ($preview !== '') {
            $out .= '<div class="aksrt-paywall-preview">' . wp_kses_post($preview) . '</div>';
        }
        $out .= aksrt_get_paywall_html($post);

        if ($pay_type === AKSRT_PAY_TYPE_GALLERY) {
            $out .= aksrt_render_paid_gallery($post);
        } elseif ($pay_type === AKSRT_PAY_TYPE_VIDEO) {
            $out .= aksrt_render_paid_video($post);
        }

        return $out;
    }
}

// 已付费的内容增强
if (!function_exists('aksrt_paid_content_enhance')) {
    function aksrt_paid_content_enhance(string $content): string {
        if (is_admin() || !is_singular() || !in_the_loop() || !is_main_query()) {
            return $content;
        }
        global $post;
        if (!($post instanceof WP_Post)) {
            return $content;
        }

        $meta = aksrt_get_pay_meta($post);
        $pay_type = (string) ($meta['pay_type'] ?? AKSRT_PAY_TYPE_NO);
        if ($pay_type === AKSRT_PAY_TYPE_NO) {
            return $content;
        }
        if (!aksrt_has_paid_access($post)) {
            return $content;
        }

        if ($pay_type === AKSRT_PAY_TYPE_GALLERY && strpos($content, 'aksrt-paid-gallery') === false) {
            $gallery_html = aksrt_render_paid_gallery($post);
            if ($gallery_html) {
                $content .= $gallery_html;
            }
        }

        if ($pay_type === AKSRT_PAY_TYPE_VIDEO && strpos($content, 'aksrt-paid-video') === false) {
            $video_html = aksrt_render_paid_video($post);
            if ($video_html) {
                $content .= $video_html;
            }
        }

        return $content;
    }
}

// ============================================================
// 付费图库/视频样式
// ============================================================

add_action('wp_head', function (): void {
    if (is_admin() || !is_singular()) return;
    global $post;
    if (!($post instanceof WP_Post)) return;

    $meta = aksrt_get_pay_meta($post);
    if (!in_array($meta['pay_type'], [AKSRT_PAY_TYPE_GALLERY, AKSRT_PAY_TYPE_VIDEO], true)) return;
    ?>
    <style>
    .aksrt-paid-gallery{margin:24px 0}
    .aksrt-paid-gallery__swiper{border-radius:var(--radius-lg);overflow:hidden}
    .aksrt-paid-gallery__swiper img{width:100%;height:auto;display:block}
    .aksrt-paid-gallery__locked{position:relative;border-radius:var(--radius-lg);overflow:hidden}
    .aksrt-paid-gallery__preview img{width:100%;display:block}
    .aksrt-paid-gallery__overlay{position:absolute;inset:0;background:rgba(0,0,0,.5);display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;gap:12px}
    .aksrt-paid-gallery__overlay i{font-size:48px;opacity:.8}
    .aksrt-paid-gallery__overlay p{font-size:16px;margin:0}
    .aksrt-paid-gallery__price{font-size:20px;font-weight:700;background:rgba(255,255,255,.2);padding:6px 16px;border-radius:20px}

    .aksrt-paid-video{margin:24px 0}
    .aksrt-paid-video__embed{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:var(--radius-lg)}
    .aksrt-paid-video__embed iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}
    .aksrt-paid-video__locked{background:var(--surface-2);border-radius:var(--radius-lg);padding:60px 20px;text-align:center}
    .aksrt-paid-video__placeholder i{font-size:64px;color:var(--color-ink-4);margin-bottom:16px}
    .aksrt-paid-video__placeholder p{font-size:16px;color:var(--color-ink-3);margin:0 0 12px}
    .aksrt-paid-video__price{font-size:20px;font-weight:700;color:var(--color-error)}
    </style>
    <?php
});