<?php
declare(strict_types=1);

namespace addon\paycenter\library;

use addon\paycenter\library\contract\Channel;
use Psr\Http\Message\MessageInterface;
use think\Response;
use Yansongda\Artful\Rocket;
use Yansongda\Supports\Collection;

/**
 * 微信支付渠道（API v3）。
 *
 * 场景映射（yansongda/pay 的 _type）：
 *   qr   → Native 扫码（返回 code_url）
 *   h5   → H5（返回 h5_url，手机浏览器跳微信）
 *   mp   → 公众号 JSAPI（需 openid，返回前端唤起参数）
 *   mini → 小程序（需 openid，返回前端唤起参数）
 *   app  → App（返回前端唤起参数）
 *
 * 注：微信早已下线官方沙箱，mode 只能留 0；验证需真实小额支付后退款。
 * 平台证书（回调验签用）留空时 SDK 会凭 APIv3 密钥自动下载，正式环境建议落到
 * runtime/cert/wechat/ 并配置 wechat_public_cert_path，避免每次请求都去拉取。
 */
class WechatChannel implements Channel
{
    public function code(): string
    {
        return 'wechat';
    }

    public function name(): string
    {
        return '微信支付';
    }

    public function configured(): bool
    {
        $cfg = PayConfig::get('wechat');

        return !empty($cfg['mch_id'])
            && !empty($cfg['mch_secret_key'])
            && !empty($cfg['mch_secret_cert'])
            && !empty($cfg['mch_public_cert_path'])
            && !empty($cfg['app_id']);
    }

    public function scenes(): array
    {
        return ['qr', 'h5', 'mp', 'mini', 'app'];
    }

    public function create(array $order, string $scene, array $urls): array
    {
        $params = [
            'out_trade_no' => (string) $order['trade_no'],
            'description'  => (string) $order['subject'],
            // 微信金额单位是【分】，且必须是整数
            'amount'       => [
                'total'    => (int) round((float) $order['amount'] * 100),
                'currency' => 'CNY',
            ],
        ];
        if (!empty($urls['notify'])) {
            $params['notify_url'] = (string) $urls['notify'];
        }

        $pay = PayFactory::wechat();
        switch ($scene) {
            case 'h5':
                $params['scene_info'] = [
                    'payer_client_ip' => (string) ($order['client_ip'] ?? (request()->ip() ?: '127.0.0.1')),
                    'h5_info'         => ['type' => 'Wap'],
                ];
                $result = $pay->h5($params);
                break;
            case 'mp':
            case 'mini':
                // JSAPI / 小程序必须带 openid，由业务侧传入（order['openid']）
                if (empty($order['openid'])) {
                    throw new PayException('微信 JSAPI/小程序下单缺少 openid', 400);
                }
                $params['payer'] = ['openid' => (string) $order['openid']];
                $result          = $scene === 'mini' ? $pay->mini($params) : $pay->mp($params);
                break;
            case 'app':
                $result = $pay->app($params);
                break;
            default:
                $result = $pay->scan($params);
        }

        return ['trade_no' => (string) $order['trade_no']] + self::normalize($result);
    }

    public function query(string $tradeNo): array
    {
        $result = PayFactory::wechat()->query(['out_trade_no' => $tradeNo]);

        return [
            'paid'       => (string) $result->get('trade_state', '') === 'SUCCESS',
            'amount'     => self::amount($result->get('amount')),
            'gateway_no' => (string) $result->get('transaction_id', ''),
        ];
    }

    public function notify(): array
    {
        $data = PayFactory::wechat()->callback();

        return [
            'paid'       => in_array((string) $data->get('trade_state', ''), ['SUCCESS', 'REFUND'], true),
            'trade_no'   => (string) $data->get('out_trade_no', ''),
            'amount'     => self::amount($data->get('amount')),
            'gateway_no' => (string) $data->get('transaction_id', ''),
        ];
    }

    public function ack(bool $ok = true): Response
    {
        $body = $ok
            ? json_encode(['code' => 'SUCCESS', 'message' => '成功'], JSON_UNESCAPED_UNICODE)
            : json_encode(['code' => 'FAIL', 'message' => '失败'], JSON_UNESCAPED_UNICODE);

        return response($body, $ok ? 200 : 500, ['Content-Type' => 'application/json']);
    }

    public function refund(string $tradeNo, float $amount, float $total): array
    {
        try {
            PayFactory::wechat()->refund([
                'out_trade_no'  => $tradeNo,
                'out_refund_no' => 'R' . $tradeNo . date('His'),
                'amount'        => [
                    'refund'   => (int) round($amount * 100),
                    'total'    => (int) round($total * 100),
                    'currency' => 'CNY',
                ],
            ]);

            return ['ok' => true, 'message' => '退款申请已提交'];
        } catch (\Throwable $e) {
            return ['ok' => false, 'message' => $e->getMessage()];
        }
    }

    /**
     * 微信金额字段有两种形态：数组 ['total'=>100,'currency'=>'CNY']（分）或标量。
     */
    private static function amount($amount): float
    {
        if (is_array($amount)) {
            return round(((int) ($amount['total'] ?? 0)) / 100, 2);
        }

        return round((float) $amount, 2);
    }

    /**
     * @return array{type: string, content: mixed}
     */
    private static function normalize($result): array
    {
        if ($result instanceof Rocket) {
            $result = $result->getDestination() ?? $result->getPayload();
        }
        if ($result instanceof MessageInterface) {
            return ['type' => 'form', 'content' => $result->getBody()->getContents()];
        }
        if ($result instanceof Collection) {
            $qr = (string) ($result->get('code_url') ?: $result->get('qr_code') ?: '');
            if ($qr !== '') {
                return ['type' => 'qrcode', 'content' => $qr];
            }
            $url = (string) ($result->get('h5_url') ?: $result->get('mweb_url') ?: '');
            if ($url !== '') {
                return ['type' => 'url', 'content' => $url];
            }

            return ['type' => 'params', 'content' => $result->toArray()];
        }
        if (is_string($result)) {
            return ['type' => 'form', 'content' => $result];
        }

        throw new PayException('支付发起失败：网关返回了无法识别的响应', 500);
    }
}