<?php
/**
 * AKSRT Alipay Gateway — 支付宝支付网关
 *
 * 使用 yurunsoft/pay-sdk 实现电脑网站支付、手机网站支付。
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

class AKSRT_Alipay_Gateway implements AKSRT_Payment_Gateway_Interface {

    public function get_id(): string {
        return 'alipay';
    }

    public function get_name(): string {
        return __('支付宝', 'aksrt');
    }

    public function is_configured(): bool {
        if (class_exists('AKSRT_Settings_Payment_Runtime')
            && !AKSRT_Settings_Payment_Runtime::is_gateway_enabled('alipay')) {
            return false;
        }
        $config = $this->get_config();
        return !empty($config['app_id']) && !empty($config['private_key']) && !empty($config['alipay_public_key']);
    }

    public function create_payment(array $order): array {
        if (!$this->is_configured()) {
            return ['success' => false, 'message' => __('支付宝未配置', 'aksrt')];
        }

        $config = $this->get_config();
        $order_number = $order['order_number'] ?? '';
        $amount = (float) ($order['amount'] ?? 0);
        $subject = $order['subject'] ?? __('订单支付', 'aksrt');
        $payment_type = $config['payment_type'] ?? 'page'; // page / wap

        try {
            $sdk = $this->create_sdk($config);

            if ($payment_type === 'wap') {
                // 手机网站支付
                $request = new \Yurun\PaySDK\AlipayApp\Wap\Params\Pay\Request;
                $request->notify_url = home_url('/wp-json/aksrt/v1/payment/alipay/notify');
                $request->return_url = home_url('/wp-json/aksrt/v1/payment/alipay/return');
                $request->businessParams->out_trade_no = $order_number;
                $request->businessParams->total_amount = number_format($amount, 2, '.', '');
                $request->businessParams->subject = $subject;
            } else {
                // 电脑网站支付
                $request = new \Yurun\PaySDK\AlipayApp\Page\Params\Pay\Request;
                $request->notify_url = home_url('/wp-json/aksrt/v1/payment/alipay/notify');
                $request->return_url = home_url('/wp-json/aksrt/v1/payment/alipay/return');
                $request->businessParams->out_trade_no = $order_number;
                $request->businessParams->total_amount = number_format($amount, 2, '.', '');
                $request->businessParams->subject = $subject;
            }

            // 构建支付跳转 URL（prepareExecute 已将查询参数追加到 $url）
            $sdk->prepareExecute($request, $url, $data);
            $payment_url = $url;

            return [
                'success'      => true,
                'payment_url'  => $payment_url,
                'payment_data' => ['order_number' => $order_number],
                'message'      => __('支付宝支付链接已生成', 'aksrt'),
            ];
        } catch (\Exception $e) {
            return ['success' => false, 'message' => $e->getMessage()];
        }
    }

    public function verify_callback(WP_REST_Request $request): array {
        $config = $this->get_config();

        try {
            $sdk = $this->create_sdk($config);
            $params = $request->get_params();

            if ($sdk->verifyCallback($params)) {
                $trade_status = $params['trade_status'] ?? '';
                return [
                    'success'        => true,
                    'order_number'   => $params['out_trade_no'] ?? '',
                    'amount'         => (float) ($params['total_amount'] ?? 0),
                    'transaction_id' => $params['trade_no'] ?? '',
                    'status'         => in_array($trade_status, ['TRADE_SUCCESS', 'TRADE_FINISHED']) ? 'paid' : 'pending',
                ];
            }

            return ['success' => false, 'message' => __('支付宝回调验证失败', 'aksrt')];
        } catch (\Exception $e) {
            return ['success' => false, 'message' => $e->getMessage()];
        }
    }

    public function query_status(string $order_number): array {
        if (!$this->is_configured()) {
            return ['success' => false, 'message' => __('支付宝未配置', 'aksrt')];
        }

        $config = $this->get_config();

        try {
            $sdk = $this->create_sdk($config);

            $request = new \Yurun\PaySDK\AlipayApp\Params\Query\Request;
            $request->businessParams->out_trade_no = $order_number;

            $result = $sdk->execute($request);

            if ($sdk->checkResult()) {
                $trade_status = $result['trade_status'] ?? '';
                $status = 'pending';
                if (in_array($trade_status, ['TRADE_SUCCESS', 'TRADE_FINISHED'])) {
                    $status = 'paid';
                } elseif ($trade_status === 'TRADE_CLOSED') {
                    $status = 'cancelled';
                }

                return [
                    'success'        => true,
                    'status'         => $status,
                    'transaction_id' => $result['trade_no'] ?? '',
                ];
            }

            return ['success' => false, 'message' => $sdk->getError() ?: __('查询失败', 'aksrt')];
        } catch (\Exception $e) {
            return ['success' => false, 'message' => $e->getMessage()];
        }
    }

    public function refund(string $order_number, float $amount): array {
        if (!$this->is_configured()) {
            return ['success' => false, 'message' => __('支付宝未配置', 'aksrt')];
        }

        $config = $this->get_config();

        try {
            $sdk = $this->create_sdk($config);

            $request = new \Yurun\PaySDK\AlipayApp\Params\Refund\Request;
            $request->businessParams->out_trade_no = $order_number;
            $request->businessParams->refund_amount = number_format($amount, 2, '.', '');
            $request->businessParams->refund_reason = __('用户申请退款', 'aksrt');
            $request->businessParams->out_request_no = $order_number . '_refund_' . time();

            $result = $sdk->execute($request);

            if ($sdk->checkResult()) {
                return [
                    'success'   => true,
                    'refund_id' => $result['trade_no'] ?? '',
                    'message'   => __('退款成功', 'aksrt'),
                ];
            }

            return ['success' => false, 'message' => $sdk->getError() ?: __('退款失败', 'aksrt')];
        } catch (\Exception $e) {
            return ['success' => false, 'message' => $e->getMessage()];
        }
    }

    private function get_config(): array {
        if (!class_exists('AKSRT_Settings')) {
            return [];
        }
        $all = AKSRT_Settings::get_all();
        return [
            'app_id'           => (string) ($all['alipay_appid'] ?? ''),
            'private_key'      => (string) ($all['alipay_privatekey'] ?? ''),
            'alipay_public_key' => (string) ($all['alipay_publickey'] ?? ''),
            'return_url'       => (string) ($all['alipay_return_url'] ?? ''),
            'notify_url'       => (string) ($all['alipay_notify_url'] ?? ''),
            'payment_type'     => (string) ($all['alipay_payment_type'] ?? 'page'),
            'sign_type'        => (string) ($all['alipay_sign_type'] ?? 'RSA2'),
        ];
    }

    private function create_sdk(array $config): \Yurun\PaySDK\AlipayApp\SDK {
        $params = new \Yurun\PaySDK\AlipayApp\Params\PublicParams;
        $params->appID         = $config['app_id'] ?? '';
        $params->appPrivateKey = $config['private_key'] ?? '';
        $params->appPublicKey  = $config['alipay_public_key'] ?? '';
        $params->sign_type     = $config['sign_type'] ?? 'RSA2';

        return new \Yurun\PaySDK\AlipayApp\SDK($params);
    }
}