<?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_Domain_Model::PAY_TYPE_NO);
}
if (!defined('AKSRT_PAY_TYPE_READING')) {
    define('AKSRT_PAY_TYPE_READING', AKSRT_Domain_Model::PAY_TYPE_READING);
}
if (!defined('AKSRT_PAY_TYPE_DOWNLOAD')) {
    define('AKSRT_PAY_TYPE_DOWNLOAD', AKSRT_Domain_Model::PAY_TYPE_DOWNLOAD);
}
if (!defined('AKSRT_PAY_TYPE_GALLERY')) {
    define('AKSRT_PAY_TYPE_GALLERY', AKSRT_Domain_Model::PAY_TYPE_GALLERY);
}
if (!defined('AKSRT_PAY_TYPE_VIDEO')) {
    define('AKSRT_PAY_TYPE_VIDEO', AKSRT_Domain_Model::PAY_TYPE_VIDEO);
}
if (!defined('AKSRT_PAY_TYPE_VIP')) {
    define('AKSRT_PAY_TYPE_VIP', AKSRT_Domain_Model::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_Domain_Model::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'),
    ];
}

// ============================================================
// 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_Domain_Model::PAY_META_KEY, true);
        if (is_array($meta) && isset($meta['pay_type'])) {
            return wp_parse_args(AKSRT_Domain_Model::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_Domain_Model::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_Domain_Model::RESOURCE_DOWNLOAD_COUNT_KEY, true);
        $view_count = (int) get_post_meta($p->ID, AKSRT_Domain_Model::POST_VIEW_COUNT_KEY, true);

        return [
            'version'         => (string) ($pay_meta['version'] ?? ''),
            'size'            => (string) ($pay_meta['size'] ?? ''),
            'price'           => (float) ($pay_meta['price'] ?? 0),
            'original_price'  => (float) ($pay_meta['original_price'] ?? 0),
            'vip1_price'      => (float) ($pay_meta['vip1_price'] ?? 0),
            'vip2_price'      => (float) ($pay_meta['vip2_price'] ?? 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, $view_count),
            'require_login'   => !empty($pay_meta['require_login']),
            'require_captcha' => !empty($pay_meta['require_captcha']),
            'subject_label'   => __('内容', 'aksrt'),
        ];
    }
}

// ============================================================
// 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。
     *
     * 实际判定全部交给 AKSRT_Content_Visibility::can_download_resource()
     * （由 inc/helpers/aksrt-resource.php 的同名 helper 在更早加载时定义）。
     * 此处仅作为该 helper 不可用时的兜底，避免出现第二套下载真相。
     *
     * @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')
            ? AKSRT_Settings::get_paid_content_settings()
            : ['download_login' => true, 'download_credit' => 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 ($uid > 0 && aksrt_has_paid_access($p, $uid)) return true;
        if ($uid > 0 && function_exists('aksrt_is_vip_exempt') && aksrt_is_vip_exempt($uid)) return true;

        $cost = aksrt_get_download_cost($p);
        if ($cost > 0 && !empty($paid_settings['download_credit'])) {
            $balance = function_exists('aksrt_user_credits') ? aksrt_user_credits($uid) : 0;
            if ($balance < $cost) {
                return new WP_Error('aksrt_credits_insufficient', __('积分不足。', 'aksrt'), [
                    'balance' => $balance,
                    'cost'    => $cost,
                ]);
            }
        }

        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')) {
            return false;
        }
        $paid = AKSRT_Settings::get_paid_content_settings();
        return !empty($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);
        $price = (float) $meta['price'];
        $currency = class_exists('AKSRT_Settings') ? AKSRT_Settings::get_currency_name() : __('积分', 'aksrt');

        if ($meta['pay_type'] === AKSRT_PAY_TYPE_VIP) {
            return ['text' => __('VIP 专属', 'aksrt'), 'free' => false, 'amount' => 0];
        }

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

        $amount = aksrt_format_price($price);
        return ['text' => sprintf(__('%s %s', 'aksrt'), $amount, $currency), 'free' => false, 'amount' => $price];
    }
}

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'])
        );
    }
}

// ============================================================
// 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'];
        $price = (float) $meta['price'];
        $currency = class_exists('AKSRT_Settings') ? AKSRT_Settings::get_currency_name() : __('积分', 'aksrt');

        $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;

        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); ?>">
            <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($type_info['desc']); ?></p>
                    <div class="aksrt-paywall__price">
                        <?php if ($price > 0) : ?>
                            <span class="aksrt-paywall__price-amount"><?php echo esc_html(aksrt_format_price($price) . ' ' . $currency); ?></span>
                            <?php if ($has_original) : ?>
                                <span class="aksrt-paywall__price-original"><?php echo esc_html(aksrt_format_price($original_price) . ' ' . $currency); ?></span>
                            <?php endif; ?>
                        <?php else : ?>
                            <span class="aksrt-paywall__price-free"><?php esc_html_e('免费', 'aksrt'); ?></span>
                        <?php endif; ?>
                    </div>
                    <?php if (!$is_logged_in) : ?>
                        <a href="<?php echo esc_url($login_url); ?>" class="but jb-red padding-lg cashier-link aksrt-paywall__btn">
                            <i class="fa fa-sign-in" aria-hidden="true"></i> <?php esc_html_e('登录后购买', 'aksrt'); ?>
                        </a>
                    <?php elseif ($price > 0) : ?>
                        <button type="button" class="but jb-red padding-lg cashier-link aksrt-paywall__btn" data-aksrt-pay-content="<?php echo esc_attr((string) $post->ID); ?>">
                            <i class="fa fa-shopping-cart" aria-hidden="true"></i> <?php printf(esc_html__('立即购买（%s）', 'aksrt'), aksrt_format_price($price) . ' ' . $currency); ?>
                        </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}
    </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：模糊预览 + 付费墙 -->
                <div class="aksrt-paid-gallery__locked">
                    <div class="aksrt-paid-gallery__preview">
                        <img src="<?php echo esc_url($images[0]); ?>" alt="" class="aksrt-gallery-locked">
                    </div>
                    <div class="aksrt-paid-gallery__overlay">
                        <i class="fas fa-images" aria-hidden="true"></i>
                        <p><?php esc_html_e('付费后即可查看全部图片', 'aksrt'); ?></p>
                        <?php
                        $price_label = aksrt_get_pay_price_label($post);
                        $currency = class_exists('AKSRT_Settings') ? AKSRT_Settings::get_currency_name() : __('积分', 'aksrt');
                        ?>
                        <span class="aksrt-paid-gallery__price">
                            <?php echo esc_html($price_label['text']); ?>
                        </span>
                    </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 -->
                <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 $price_label = aksrt_get_pay_price_label($post); ?>
                        <span class="aksrt-paid-video__price"><?php echo esc_html($price_label['text']); ?></span>
                    </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()) return $content;
        global $post;
        if (!($post instanceof WP_Post)) return $content;
        if (aksrt_can_access_content($post)) return $content;

        // 图库类型：在内容末尾追加图库轮播
        $meta = aksrt_get_pay_meta($post);
        if ($meta['pay_type'] === AKSRT_PAY_TYPE_GALLERY) {
            return aksrt_get_paywall_html($post) . aksrt_render_paid_gallery($post);
        }

        // 视频类型：在内容末尾追加视频播放器
        if ($meta['pay_type'] === AKSRT_PAY_TYPE_VIDEO) {
            return aksrt_get_paywall_html($post) . aksrt_render_paid_video($post);
        }

        return aksrt_get_paywall_html($post);
    }
}

// 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()) return $content;
        global $post;
        if (!($post instanceof WP_Post)) return $content;

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

        // 已付费的图库：追加 Swiper 轮播
        if ($meta['pay_type'] === AKSRT_PAY_TYPE_GALLERY) {
            $gallery_html = aksrt_render_paid_gallery($post);
            if ($gallery_html) $content .= $gallery_html;
        }

        // 已付费的视频：追加播放器
        if ($meta['pay_type'] === AKSRT_PAY_TYPE_VIDEO) {
            $video_html = aksrt_render_paid_video($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
});