<?php
/**
 * AKSRT VIP Service — package parse, purchase, activate membership.
 *
 * product_type = ORDER_PRODUCT_VIP
 * product_id encodes package: level * 1000 + index (1-based)
 *
 * packages_raw line format: price|days|title  (days 0 = permanent)
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

class AKSRT_Vip_Service {

    private static $instance = null;

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

    public function init(): void {
        add_action('rest_api_init', [$this, 'register_routes']);
        add_action('aksrt_order_paid', [$this, 'on_order_paid'], 20, 2);
    }

    public function register_routes(): void {
        register_rest_route('aksrt/v1', '/pay/vip', [
            [
                'methods'             => 'GET',
                'callback'            => [$this, 'rest_catalog'],
                'permission_callback' => [$this, 'check_rest_nonce'],
            ],
            [
                'methods'             => 'POST',
                'callback'            => [$this, 'rest_purchase'],
                'permission_callback' => [$this, 'check_rest_nonce'],
            ],
        ]);
    }

    /**
     * @param WP_REST_Request $request
     * @return true|WP_Error
     */
    public function check_rest_nonce(WP_REST_Request $request) {
        $nonce = $request->get_header('x-wp-nonce');
        if (!$nonce) {
            return new WP_Error('aksrt_rest_no_nonce', __('缺少安全令牌', 'aksrt'), ['status' => 403]);
        }
        if (!wp_verify_nonce($nonce, 'wp_rest')) {
            return new WP_Error('aksrt_rest_bad_nonce', __('安全令牌已过期，请刷新页面', 'aksrt'), ['status' => 403]);
        }
        return true;
    }

    /**
     * GET /pay/vip
     */
    public function rest_catalog(WP_REST_Request $request) {
        $uid = get_current_user_id();
        return new WP_REST_Response($this->get_catalog($uid), 200);
    }

    /**
     * POST /pay/vip
     * body: { package_id: int, payment_method?: string }
     */
    public function rest_purchase(WP_REST_Request $request) {
        $uid = get_current_user_id();
        if ($uid <= 0) {
            return new WP_Error('aksrt_need_login', __('请先登录后再开通会员。', 'aksrt'), [
                'status' => 401,
                'login_url' => function_exists('aksrt_get_login_url') ? aksrt_get_login_url() : wp_login_url(),
            ]);
        }

        $params = $request->get_json_params();
        if (!is_array($params)) {
            $params = $request->get_params();
        }
        $package_id = (int) ($params['package_id'] ?? 0);
        $payment_method = sanitize_key((string) ($params['payment_method'] ?? 'balance'));
        if ($payment_method === '' || $payment_method === 'cash') {
            $payment_method = 'balance';
        }

        $result = $this->purchase($uid, $package_id, $payment_method);
        if (is_wp_error($result)) {
            return $result;
        }
        if (empty($result['success'])) {
            return new WP_Error(
                sanitize_key((string) ($result['code'] ?? 'aksrt_vip_pay_failed')),
                (string) ($result['message'] ?? __('开通失败', 'aksrt')),
                ['status' => (int) ($result['status'] ?? 400)]
            );
        }
        return new WP_REST_Response($result, 200);
    }

    /**
     * @return array<string,mixed>
     */
    public function get_catalog(int $user_id = 0): array {
        $vip = class_exists('AKSRT_Settings')
            ? AKSRT_Settings::get_payment_vip_settings()
            : ['enabled' => false, 'packages_raw' => '', 'levels' => [], 'renew' => [], 'upgrade' => []];

        $level = function_exists('aksrt_get_user_vip_level') ? aksrt_get_user_vip_level($user_id) : 0;
        $expires = $user_id > 0 ? (int) get_user_meta($user_id, 'aksrt_vip_expires', true) : 0;
        $is_permanent = ($level > 0 && $expires <= 0);
        $packages = $this->parse_packages((string) ($vip['packages_raw'] ?? ''));
        $levels = is_array($vip['levels'] ?? null) ? $vip['levels'] : [];
        $renew = is_array($vip['renew'] ?? null) ? $vip['renew'] : [];
        $upgrade = is_array($vip['upgrade'] ?? null) ? $vip['upgrade'] : [];
        $renew_enabled = !isset($renew['enabled']) || !empty($renew['enabled']);
        $upgrade_enabled = !isset($upgrade['enabled']) || !empty($upgrade['enabled']);

        $level_packages = [];
        foreach ([1, 2] as $lv) {
            if (empty($levels[$lv]['enabled'])) {
                continue;
            }
            // Permanent VIP at same/higher level: only show higher-level upgrade packages.
            if ($is_permanent && $lv <= $level) {
                continue;
            }
            // Existing VIP without renew: hide same-level packages.
            if ($level > 0 && $lv === $level && !$renew_enabled) {
                continue;
            }
            // Existing VIP without upgrade: hide higher-level packages.
            if ($level > 0 && $lv > $level && !$upgrade_enabled) {
                continue;
            }

            $name = (string) ($levels[$lv]['name'] ?? ('VIP' . $lv));
            $items = [];
            foreach ($packages as $idx => $pkg) {
                $base_price = (float) $pkg['price'];
                $days = (int) $pkg['days'];
                // Permanent members don't renew timed packages at same level (already filtered).
                // Non-permanent same-level: renew pricing.
                $action = 'pay';
                if ($level > 0 && $lv === $level) {
                    $action = 'renew';
                } elseif ($level > 0 && $lv > $level) {
                    $action = 'upgrade';
                }

                $priced = $this->apply_action_price($base_price, $action, $renew, $upgrade, $lv, $level, $expires, $is_permanent, $days);
                if ($priced === null) {
                    continue;
                }

                $items[] = [
                    'package_id'     => $this->encode_package_id($lv, $idx + 1),
                    'level'          => $lv,
                    'index'          => $idx + 1,
                    'action'         => $action,
                    'price'          => (float) $priced['price'],
                    'base_price'     => $base_price,
                    'show_price'     => (float) ($priced['show_price'] ?? 0),
                    'discount_tag'   => (string) ($priced['tag'] ?? ''),
                    'days'           => $days,
                    'title'          => (string) $pkg['title'],
                    'price_label'    => $this->format_cash_label((float) $priced['price']),
                    'show_price_label' => !empty($priced['show_price'])
                        ? $this->format_cash_label((float) $priced['show_price'])
                        : '',
                    'days_label'     => ($days <= 0)
                        ? __('永久', 'aksrt')
                        : sprintf(
                            /* translators: %d: days */
                            __('%d 天', 'aksrt'),
                            $days
                        ),
                    'cta_label'      => $action === 'renew'
                        ? __('立即续费', 'aksrt')
                        : ($action === 'upgrade' ? __('立即升级', 'aksrt') : __('立即开通', 'aksrt')),
                ];
            }

            // Optional dedicated upgrade permanent product line from settings.upgrade.product
            // Format: price|days|title  (single package for VIP2 upgrade).
            if ($level === 1 && $lv === 2 && $upgrade_enabled) {
                $upgrade_pkg = $this->parse_upgrade_product_line((string) ($upgrade['product'] ?? ''));
                if ($upgrade_pkg) {
                    $items[] = [
                        'package_id'         => $this->encode_package_id(2, 901),
                        'level'              => 2,
                        'index'              => 901,
                        'action'             => 'upgrade',
                        'price'              => (float) $upgrade_pkg['price'],
                        'base_price'         => (float) $upgrade_pkg['price'],
                        'show_price'         => 0.0,
                        'discount_tag'       => __('升级专享', 'aksrt'),
                        'days'               => (int) $upgrade_pkg['days'],
                        'title'              => (string) $upgrade_pkg['title'],
                        'price_label'        => $this->format_cash_label((float) $upgrade_pkg['price']),
                        'show_price_label'   => '',
                        'days_label'         => ((int) $upgrade_pkg['days'] <= 0)
                            ? __('永久', 'aksrt')
                            : sprintf(__('%d 天', 'aksrt'), (int) $upgrade_pkg['days']),
                        'cta_label'          => __('立即升级', 'aksrt'),
                        'is_upgrade_product' => true,
                    ];
                }
            }

            if ($items === []) {
                continue;
            }
            $level_packages[] = [
                'level'  => $lv,
                'name'   => $name,
                'action' => ($level > 0 && $lv === $level) ? 'renew' : (($level > 0 && $lv > $level) ? 'upgrade' : 'pay'),
                'items'  => $items,
            ];
        }

        $methods = $this->available_payment_methods();

        return [
            'enabled'            => !empty($vip['enabled']),
            'desc'               => (string) ($vip['desc'] ?? ''),
            'help_text'          => (string) ($vip['help_text'] ?? ''),
            'user_level'         => $level,
            'user_expires'       => $expires,
            'user_is_permanent'  => $is_permanent,
            'user_expires_label' => $this->format_expires_label($expires, $level),
            'renew_enabled'      => $renew_enabled,
            'upgrade_enabled'    => $upgrade_enabled,
            'renew_desc'         => (string) ($renew['desc'] ?? ''),
            'upgrade_desc'       => (string) ($upgrade['desc'] ?? ''),
            'level_packages'     => $level_packages,
            'payment_methods'    => $methods,
            '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('/')),
            'logged_in'          => $user_id > 0,
        ];
    }

    /**
     * @return array|WP_Error
     */
    public function purchase(int $user_id, int $package_id, string $payment_method = 'balance') {
        if ($user_id <= 0) {
            return new WP_Error('aksrt_need_login', __('请先登录后再开通会员。', 'aksrt'), ['status' => 401]);
        }

        $decoded = $this->decode_package_id($package_id);
        if (!$decoded) {
            return new WP_Error('aksrt_invalid_package', __('套餐无效', 'aksrt'), ['status' => 400]);
        }
        $level = (int) $decoded['level'];
        $index = (int) $decoded['index'];

        $vip = class_exists('AKSRT_Settings')
            ? AKSRT_Settings::get_payment_vip_settings()
            : ['enabled' => false, 'packages_raw' => '', 'levels' => [], 'renew' => [], 'upgrade' => []];
        if (empty($vip['enabled'])) {
            return new WP_Error('aksrt_vip_disabled', __('会员功能未启用', 'aksrt'), ['status' => 400]);
        }
        $levels = is_array($vip['levels'] ?? null) ? $vip['levels'] : [];
        if (empty($levels[$level]['enabled'])) {
            return new WP_Error('aksrt_vip_level_disabled', __('该会员等级未启用', 'aksrt'), ['status' => 400]);
        }

        $user_level = function_exists('aksrt_get_user_vip_level') ? aksrt_get_user_vip_level($user_id) : 0;
        $expires = (int) get_user_meta($user_id, 'aksrt_vip_expires', true);
        $is_permanent = ($user_level > 0 && $expires <= 0);
        $renew = is_array($vip['renew'] ?? null) ? $vip['renew'] : [];
        $upgrade = is_array($vip['upgrade'] ?? null) ? $vip['upgrade'] : [];
        $renew_enabled = !isset($renew['enabled']) || !empty($renew['enabled']);
        $upgrade_enabled = !isset($upgrade['enabled']) || !empty($upgrade['enabled']);

        if ($is_permanent && $level <= $user_level) {
            return new WP_Error('aksrt_vip_permanent', __('您已是永久会员，无需续费。', 'aksrt'), ['status' => 400]);
        }
        if ($user_level > 0 && $level === $user_level && !$renew_enabled) {
            return new WP_Error('aksrt_vip_renew_disabled', __('续费功能未开启。', 'aksrt'), ['status' => 400]);
        }
        if ($user_level > 0 && $level > $user_level && !$upgrade_enabled) {
            return new WP_Error('aksrt_vip_upgrade_disabled', __('升级功能未开启。', 'aksrt'), ['status' => 400]);
        }
        if ($user_level > 0 && $level < $user_level) {
            return new WP_Error('aksrt_vip_downgrade', __('不支持降级购买。', 'aksrt'), ['status' => 400]);
        }

        $action = 'pay';
        if ($user_level > 0 && $level === $user_level) {
            $action = 'renew';
        } elseif ($user_level > 0 && $level > $user_level) {
            $action = 'upgrade';
        }

        // Dedicated upgrade product (index 901).
        if ($index === 901) {
            $upgrade_pkg = $this->parse_upgrade_product_line((string) ($upgrade['product'] ?? ''));
            if (!$upgrade_pkg || $level !== 2) {
                return new WP_Error('aksrt_invalid_package', __('升级套餐不存在', 'aksrt'), ['status' => 400]);
            }
            $pkg = $upgrade_pkg;
            $amount = round((float) $pkg['price'], 2);
            $days = (int) $pkg['days'];
            $base_price = $amount;
            $discount_tag = __('升级专享', 'aksrt');
        } else {
            $packages = $this->parse_packages((string) ($vip['packages_raw'] ?? ''));
            $pkg = $packages[$index - 1] ?? null;
            if (!$pkg) {
                return new WP_Error('aksrt_invalid_package', __('套餐不存在', 'aksrt'), ['status' => 400]);
            }
            $base_price = (float) $pkg['price'];
            $days = (int) $pkg['days'];
            $priced = $this->apply_action_price($base_price, $action, $renew, $upgrade, $level, $user_level, $expires, $is_permanent, $days);
            if ($priced === null) {
                return new WP_Error('aksrt_invalid_package', __('当前无法购买该套餐', 'aksrt'), ['status' => 400]);
            }
            $amount = round((float) $priced['price'], 2);
            $discount_tag = (string) ($priced['tag'] ?? '');
        }

        if ($amount <= 0) {
            return new WP_Error('aksrt_invalid_price', __('套餐价格无效', 'aksrt'), ['status' => 400]);
        }

        if (!class_exists('AKSRT_Order') || !class_exists('AKSRT_Order_Repository')) {
            return new WP_Error('aksrt_pay_unavailable', __('支付系统不可用', 'aksrt'), ['status' => 500]);
        }

        $payment_method = sanitize_key($payment_method);
        if ($payment_method === '') {
            $payment_method = 'balance';
        }

        $note = wp_json_encode([
            'vip_pay' => 1,
            'level' => $level,
            'days' => $days,
            'package_index' => $index,
            'package_title' => (string) ($pkg['title'] ?? ''),
            'package_id' => $package_id,
            'action' => $action,
            'base_price' => $base_price,
            'discount_tag' => $discount_tag,
        ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);

        $order_number = AKSRT_Order_Repository::get_instance()->create([
            'user_id' => $user_id,
            'product_type' => AKSRT_Domain_Model::ORDER_PRODUCT_VIP,
            'product_id' => $package_id,
            'amount' => $amount,
            'currency' => 'CNY',
            'status' => AKSRT_Order::STATUS_PENDING,
            'payment_method' => $payment_method,
            'note' => is_string($note) ? $note : '',
            'expires_at' => gmdate('Y-m-d H:i:s', time() + 30 * MINUTE_IN_SECONDS),
        ]);
        if ($order_number === '') {
            return new WP_Error('aksrt_order_create_failed', __('创建订单失败', 'aksrt'), ['status' => 500]);
        }

        $order = AKSRT_Order_Repository::get_instance()->get($order_number);
        if (!$order) {
            return new WP_Error('aksrt_order_create_failed', __('创建订单失败', 'aksrt'), ['status' => 500]);
        }

        $level_name = (string) ($levels[$level]['name'] ?? ('VIP' . $level));
        $action_label = $action === 'renew' ? __('续费', 'aksrt') : ($action === 'upgrade' ? __('升级', 'aksrt') : __('开通', 'aksrt'));
        $order['subject'] = sprintf(
            /* translators: 1: action 2: vip name 3: package title */
            __('%1$s%2$s · %3$s', 'aksrt'),
            $action_label,
            $level_name,
            (string) ($pkg['title'] ?? '')
        );
        $order['payment_method'] = $payment_method;

        if (!class_exists('AKSRT_Payment_Gateway')) {
            return new WP_Error('aksrt_pay_unavailable', __('支付网关不可用', 'aksrt'), ['status' => 500]);
        }
        $gateway = AKSRT_Payment_Gateway::get_instance()->get_gateway($payment_method);
        if (!$gateway) {
            return new WP_Error('aksrt_gateway_unavailable', __('当前支付方式不可用', 'aksrt'), [
                'status' => 400,
                'order_number' => $order_number,
            ]);
        }
        if (method_exists($gateway, 'is_configured') && !$gateway->is_configured()) {
            return new WP_Error('aksrt_gateway_unconfigured', __('该支付方式尚未配置，请联系站长。', 'aksrt'), [
                'status' => 400,
                'order_number' => $order_number,
            ]);
        }

        $payment_result = $gateway->create_payment($order);
        if (empty($payment_result['success'])) {
            $msg = (string) ($payment_result['message'] ?? __('支付失败', 'aksrt'));
            $code = ($payment_method === 'balance' && (str_contains($msg, '余额') || str_contains($msg, '不足')))
                ? 'aksrt_balance_insufficient'
                : 'aksrt_pay_failed';
            return new WP_Error($code, $msg, [
                'status' => 402,
                'order_number' => $order_number,
            ]);
        }

        $code_url = (string) ($payment_result['payment_data']['code_url'] ?? '');
        $payment_url = (string) ($payment_result['payment_url'] ?? '');
        if ($payment_url !== '' || $code_url !== '') {
            return [
                'success' => true,
                'data' => [
                    'redirect' => true,
                    'payment_url' => $payment_url,
                    'qr_content' => $code_url,
                    'order_number' => $order_number,
                    'amount' => $amount,
                    'message' => $payment_result['message'] ?? __('请在新页面完成支付。', 'aksrt'),
                    'reload' => false,
                    'poll' => true,
                ],
            ];
        }

        $paid = AKSRT_Order::get_instance()->update_status($order_number, AKSRT_Order::STATUS_PAID, [
            'payment_method' => $payment_method,
            'payment_transaction_id' => sanitize_text_field((string) ($payment_result['transaction_id'] ?? '')),
            'note' => __('用户完成会员开通支付。', 'aksrt'),
        ]);
        if (!$paid) {
            return new WP_Error('aksrt_order_confirm_failed', __('订单确认失败', 'aksrt'), ['status' => 500]);
        }

        return [
            'success' => true,
            'data' => [
                'order_number' => $order_number,
                'amount' => $amount,
                'level' => $level,
                'days' => $days,
                'action' => $action,
                'message' => $action === 'renew'
                    ? __('会员续费成功', 'aksrt')
                    : ($action === 'upgrade' ? __('会员升级成功', 'aksrt') : __('会员开通成功', 'aksrt')),
                'reload' => true,
            ],
        ];
    }

    /**
     * Activate VIP on paid order.
     *
     * @param string $order_number
     * @param array  $paid_order
     */
    public function on_order_paid(string $order_number, array $paid_order): void {
        if (sanitize_key((string) ($paid_order['product_type'] ?? '')) !== AKSRT_Domain_Model::ORDER_PRODUCT_VIP) {
            return;
        }
        $user_id = (int) ($paid_order['user_id'] ?? 0);
        if ($user_id <= 0) {
            return;
        }

        $meta = [];
        if (!empty($paid_order['note']) && is_string($paid_order['note'])) {
            $decoded = json_decode($paid_order['note'], true);
            if (is_array($decoded)) {
                $meta = $decoded;
            }
        }
        if (empty($meta) && is_array($paid_order['meta_payload'] ?? null)) {
            $meta = $paid_order['meta_payload'];
        }

        $level = (int) ($meta['level'] ?? 0);
        $days = (int) ($meta['days'] ?? 0);
        if ($level <= 0) {
            $decoded = $this->decode_package_id((int) ($paid_order['product_id'] ?? 0));
            if ($decoded) {
                $level = (int) $decoded['level'];
            }
        }
        if ($level < 1) {
            $level = 1;
        }
        if ($level > 2) {
            $level = 2;
        }

        $this->activate_vip($user_id, $level, $days);
    }

    /**
     * Apply membership meta.
     */
    public function activate_vip(int $user_id, int $level, int $days = 0): void {
        if ($user_id <= 0) {
            return;
        }
        $level = max(1, min(2, $level));
        $current_level = (int) get_user_meta($user_id, 'aksrt_vip_level', true);
        $new_level = max($current_level, $level);
        update_user_meta($user_id, 'aksrt_vip_level', $new_level);

        if ($days <= 0) {
            // Permanent.
            update_user_meta($user_id, 'aksrt_vip_expires', 0);
            return;
        }

        $current_exp = (int) get_user_meta($user_id, 'aksrt_vip_expires', true);
        if ($current_exp === 0 && $current_level > 0) {
            // Already permanent — keep permanent.
            return;
        }
        $base = max($current_exp, time());
        update_user_meta($user_id, 'aksrt_vip_expires', $base + ($days * DAY_IN_SECONDS));
    }

    /**
     * Parse packages_raw lines: price|days|title
     *
     * @return array<int, array{price:float,days:int,title:string}>
     */
    public function parse_packages(string $raw): array {
        $lines = preg_split('/\r\n|\r|\n/', $raw) ?: [];
        $out = [];
        foreach ($lines as $line) {
            $line = trim((string) $line);
            if ($line === '') {
                continue;
            }
            $parts = array_map('trim', explode('|', $line));
            $price = isset($parts[0]) ? (float) $parts[0] : 0.0;
            $days = isset($parts[1]) ? (int) $parts[1] : 0;
            $title = isset($parts[2]) ? sanitize_text_field($parts[2]) : '';
            if ($price <= 0) {
                continue;
            }
            if ($title === '') {
                $title = $days > 0
                    ? sprintf(__('%d天会员', 'aksrt'), $days)
                    : __('永久会员', 'aksrt');
            }
            $out[] = [
                'price' => round($price, 2),
                'days'  => max(0, $days),
                'title' => $title,
            ];
        }
        return $out;
    }

    /**
     * Single upgrade product line: price|days|title
     *
     * @return array{price:float,days:int,title:string}|null
     */
    public function parse_upgrade_product_line(string $raw): ?array {
        $raw = trim($raw);
        if ($raw === '') {
            return null;
        }
        // Allow multiline; take first valid.
        $lines = preg_split('/\r\n|\r|\n/', $raw) ?: [];
        foreach ($lines as $line) {
            $parsed = $this->parse_packages((string) $line);
            if (!empty($parsed[0])) {
                return $parsed[0];
            }
        }
        return null;
    }

    /**
     * Apply renew discount/reduce to same-level packages.
     *
     * @param array<string,mixed> $renew
     * @param array<string,mixed> $upgrade
     * @return array{price:float,show_price:float,tag:string}|null
     */
    private function apply_action_price(
        float $base_price,
        string $action,
        array $renew,
        array $upgrade,
        int $target_level,
        int $user_level,
        int $expires,
        bool $is_permanent,
        int $days
    ): ?array {
        if ($base_price <= 0) {
            return null;
        }

        // Permanent same-level packages never make sense for renew.
        if ($action === 'renew' && $is_permanent) {
            return null;
        }

        if ($action !== 'renew') {
            return [
                'price' => round($base_price, 2),
                'show_price' => 0.0,
                'tag' => '',
            ];
        }

        $type = sanitize_key((string) ($renew['price_type'] ?? 'discount'));
        $price = $base_price;
        $show = $base_price;
        $tag = '';

        if ($type === 'discount') {
            // Settings store "8" meaning 8折 (80%) when <= 10; or percent when > 10.
            $discount = (float) ($renew['discount'] ?? 8);
            if ($discount <= 0) {
                $discount = 8;
            }
            if ($discount <= 10) {
                $price = round($base_price * ($discount / 10), 2);
                $tag = sprintf(
                    /* translators: %s: discount like 8 */
                    __('%s折续费', 'aksrt'),
                    rtrim(rtrim(number_format($discount, 1, '.', ''), '0'), '.')
                );
            } else {
                $price = round($base_price * (min(100, $discount) / 100), 2);
                $tag = sprintf(__('%s%% 续费价', 'aksrt'), (string) (int) $discount);
            }
        } elseif ($type === 'reduce') {
            $reduce = max(0, (float) ($renew['reduce'] ?? 20));
            $price = round(max(0.01, $base_price - $reduce), 2);
            $tag = sprintf(
                /* translators: %s: amount */
                __('续费立减%s', 'aksrt'),
                $this->format_cash_label($reduce)
            );
        } else {
            // same
            $show = 0.0;
            $tag = __('续费同价', 'aksrt');
        }

        if ($price < 0.01) {
            $price = 0.01;
        }
        if ($show > 0 && $price >= $show) {
            $show = 0.0;
            $tag = __('续费', 'aksrt');
        }

        return [
            'price' => $price,
            'show_price' => $show > $price ? $show : 0.0,
            'tag' => $tag,
        ];
    }

    public function encode_package_id(int $level, int $index): int {
        return (max(1, min(2, $level)) * 1000) + max(1, $index);
    }

    /**
     * @return array{level:int,index:int}|null
     */
    public function decode_package_id(int $package_id): ?array {
        if ($package_id < 1001) {
            return null;
        }
        $level = intdiv($package_id, 1000);
        $index = $package_id % 1000;
        if ($level < 1 || $level > 2 || $index < 1) {
            return null;
        }
        return ['level' => $level, 'index' => $index];
    }

    /**
     * @return array<int, array{id:string,name:string}>
     */
    private function available_payment_methods(): array {
        $methods = [];
        if (!class_exists('AKSRT_Payment_Gateway')) {
            return [['id' => 'balance', 'name' => __('站内余额', 'aksrt')]];
        }
        $gw = AKSRT_Payment_Gateway::get_instance();
        foreach (['balance', 'alipay', 'wechatpay', 'paypal', 'stripe'] 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() : $id,
            ];
        }
        if ($methods === []) {
            $methods[] = ['id' => 'balance', 'name' => __('站内余额', 'aksrt')];
        }
        return $methods;
    }

    private function format_cash_label(float $amount): string {
        $symbol = '￥';
        if (class_exists('AKSRT_Settings')) {
            $paid = AKSRT_Settings::get_paid_content_settings();
            $symbol = (string) ($paid['display']['currency_symbol'] ?? '￥');
        }
        $n = function_exists('aksrt_format_price') ? aksrt_format_price($amount) : (string) $amount;
        return $symbol . $n;
    }

    private function format_expires_label(int $expires, int $level): string {
        if ($level <= 0) {
            return __('未开通', 'aksrt');
        }
        if ($expires <= 0) {
            return __('永久有效', 'aksrt');
        }
        if ($expires < time()) {
            return __('已过期', 'aksrt');
        }
        return sprintf(
            /* translators: %s: date */
            __('到期时间：%s', 'aksrt'),
            wp_date('Y-m-d H:i', $expires)
        );
    }
}