<?php

namespace app\common\service;

use EasyWeChat\MiniApp\Application as MiniAppApplication;
use EasyWeChat\Pay\Application as PayApplication;
use EasyWeChat\Pay\Message as PayMessage;
use think\Log;

/**
 * 微信服务(EasyWeChat 6.x)
 * 文档: https://easywechat.com/6.x/
 * - 小程序: MiniApp\Application
 * - 支付(含回调验签): Pay\Application (微信支付 v3)
 */
class EasyWeChatService
{
    public $config;

    /** @var MiniAppApplication 小程序实例 */
    public $app;

    /** @var PayApplication 微信支付 v3 实例 */
    public $payApp;

    public function __construct()
    {
        $this->config = config('common.wechat');

        // 小程序
        $this->app = new MiniAppApplication([
            'app_id' => $this->config['app_id'],
            'secret' => $this->config['secret'],
            'http'  => ['throw' => false, 'timeout' => 10.0],
        ]);

        // 微信支付 v3
        $this->payApp = new PayApplication([
            'mch_id'         => $this->config['mch_id'],
            'secret_key'     => $this->config['secret_key'], // APIv3 密钥
            'v2_secret_key'  => $this->config['v2_secret_key'], // 旧 v2 密钥(兼容 v2 模式回调)
            'private_key'    => $this->config['private_key'], // 商户证书私钥
            'certificate'    => $this->config['certificate'], // 商户API证书
            'platform_certs' => $this->config['platform_certs'], // 微信支付公钥/平台证书
            'http'           => ['throw' => false, 'timeout' => 10.0],
        ]);
    }

    /**
     * 小程序登录(code2session)
     * @param string $code wx.login 获取的 code
     * @return array {openid, session_key, unionid?}
     */
    public function login($code)
    {
        $res = $this->app->getUtils()->codeToSession($code);
        Log::info('login-res' . json_encode([$res], JSON_UNESCAPED_UNICODE));
        return $res;
    }

    /**
     * 解密开放数据(手机号等)
     * @param $sessionKey code2session 返回的 session_key
     * @param $iv
     * @param $encryptedData
     * @return array
     */
    public function decryData($sessionKey, $iv, $encryptedData)
    {
        return $this->app->getUtils()->decryptSession($sessionKey, $iv, $encryptedData);
    }

    /**
     * 统一下单(小程序 JSAPI 支付, v3)
     * @param string $body 商品描述
     * @param string $out_trade_no 商户订单号
     * @param float $total_fee 金额(单位:元)
     * @param string $openid 支付用户 openid
     * @param string $notify_url 支付结果通知地址,留空使用配置默认
     * @return array 含 prepay_id;失败时含 message 等错误信息
     */
    public function unify($body, $out_trade_no, $total_fee, $openid, $notify_url = '')
    {
        $params = [
            'appid'        => $this->config['app_id'],
            'mchid'        => (string)$this->payApp->getMerchant()->getMerchantId(),
            'description'  => $body,
            'out_trade_no' => $out_trade_no,
            'notify_url'   => $notify_url ?: $this->config['notify_url'],
            'amount'       => ['total' => (int)round($total_fee * 100), 'currency' => 'CNY'], // 转为分
            'payer'        => ['openid' => $openid],
        ];
        Log::info('unify-params' . json_encode($params, JSON_UNESCAPED_UNICODE));
        $response = $this->payApp->getClient()->postJson('v3/pay/transactions/jsapi', $params);
        $result = $response->toArray(false);
        Log::info('unify-res' . json_encode($result, JSON_UNESCAPED_UNICODE));

        return $result;
    }

    /**
     * 小程序调起支付参数(wx.requestPayment)
     * @param string $prepayId
     * @return array {timeStamp, nonceStr, package, signType, paySign}
     */
    public function sdkConfig($prepayId)
    {
        $config = $this->payApp->getUtils()->buildMiniAppConfig($prepayId, $this->config['app_id']);
        Log::info('buildMiniAppConfig-res' . json_encode($config, JSON_UNESCAPED_UNICODE));
        return $config;
    }

    /**
     * 发送小程序订阅消息
     * @param $user_id
     * @param $template_id
     * @param array $msgData
     */
    public function sendMsg($user_id, $template_id, array $msgData = [])
    {
        $data = SubscribeMessageService::packMsg($user_id, $template_id, $msgData);

        $response = $this->app->getClient()->postJson('/cgi-bin/message/subscribe/send', $data);
        $res = $response->toArray(false);
        Log::info('发送订阅消息-res' . json_encode(['data' => $data, 'res' => $res], JSON_UNESCAPED_UNICODE));
    }

    /**
     * 商家转账到零钱(v3, 原 v2 企业付款已停用)
     * 需在商户平台开通「商家转账」产品权限
     * @param string $order_sn 提现单号(字母或数字)
     * @param string $openid
     * @param string $name 收款用户姓名(商家转账不校验时可留空)
     * @param float $amount 金额(单位:元)
     * @param string $desc
     * @return array {out_batch_no, batch_id, create_time};失败时含 message
     */
    public function mchPay($order_sn, $openid, $name, $amount, $desc = '用户提现')
    {
        $params = [
            'appid'              => $this->config['app_id'],
            'out_batch_no'       => $order_sn,
            'batch_name'         => '用户提现',
            'batch_remark'       => $desc,
            'total_amount'       => (int)round($amount * 100), // 转为分
            'total_num'          => 1,
            'transfer_detail_list' => [
                [
                    'out_detail_no'   => $order_sn . 'D1', // 明细单号(字母数字,保持唯一)
                    'transfer_amount' => (int)round($amount * 100),
                    'transfer_remark' => $desc,
                    'openid'          => $openid,
                ],
            ],
        ];
        Log::info('商家转账-params' . json_encode($params, JSON_UNESCAPED_UNICODE));
        $response = $this->payApp->getClient()->postJson('v3/transfer/batches', $params);
        $res = $response->toArray(false);
        Log::info('商家转账-res' . json_encode($res, JSON_UNESCAPED_UNICODE));

        return $res;
    }

    /**
     * 查询商家转账批次状态
     * @param string $apply_sn 商家转账单号(out_batch_no)
     * @return array 转账批次状态及明细
     */
    public function queryBalance($apply_sn)
    {
        $response = $this->payApp->getClient()->get("v3/transfer/batches/out-batch-no/{$apply_sn}", [
            'query' => [
                'need_query_detail' => 'true',
                'offset'            => 0,
                'limit'             => 20,
                'detail_status'     => 'ALL',
            ],
        ]);
        $res = $response->toArray(false);
        Log::info('商家转账查询-res' . json_encode(['apply_sn' => $apply_sn, 'res' => $res], JSON_UNESCAPED_UNICODE));

        return $res;
    }

    /**
     * 微信支付退款(v3)
     * @param string $order_sn 商户订单号
     * @param string $refund_no 商户退款单号
     * @param float $actual_amount 原订单金额(单位:元)
     * @param float $refund_amount 退款金额(单位:元)
     * @param string $desc 退款原因
     * @return array
     */
    public function refund($order_sn, $refund_no, $actual_amount, $refund_amount, $desc = '出票失败退款')
    {
        $params = [
            'out_trade_no'   => $order_sn,
            'out_refund_no' => $refund_no,
            'reason'        => $desc,
            'amount'        => [
                'refund'   => (int)bcmul($refund_amount, 100), // 转为分
                'total'    => (int)bcmul($actual_amount, 100),
                'currency' => 'CNY',
            ],
        ];
        Log::info('微信订单退款-params' . json_encode($params, JSON_UNESCAPED_UNICODE));
        $response = $this->payApp->getClient()->postJson('v3/refund/domestic/refunds', $params);
        $res = $response->toArray(false);
        Log::info('微信订单退款-res' . json_encode(['param' => func_get_args(), 'res' => $res], JSON_UNESCAPED_UNICODE));

        return $res;
    }

    /**
     * 查询退款(v3)
     * @param string $refund_no 商户退款单号
     * @return array
     */
    public function refundQuery($refund_no)
    {
        $response = $this->payApp->getClient()->get("v3/refund/domestic/refunds/{$refund_no}");
        $res = $response->toArray(false);
        Log::info('微信订单退款查询-res' . json_encode(['param' => func_get_args(), 'res' => $res], JSON_UNESCAPED_UNICODE));

        return $res;
    }

    /**
     * 处理微信支付 v3 回调(验签+解密),返回 PSR-7 响应
     * @param \Closure $paidHandler function(PayMessage $message){ 业务处理;异常时抛出则返回失败 }
     * @return \Psr\Http\Message\ResponseInterface
     */
    public function handlePayNotify(\Closure $paidHandler)
    {
        $request = $this->payApp->getRequest();
        $traceId = date('YmdHis') . substr(md5(uniqid('', true)), 0, 6);

        // 【日志1】回调原始报文：确认微信有没有真的打过来、打到哪个地址
        Log::info('微信支付回调[收到请求] trace=' . $traceId . ' ' . json_encode([
            'method'  => $request->getMethod(),
            'uri'     => (string)$request->getUri(),
            'headers' => self::getNotifyHeaders($request),
            'body'    => (string)$request->getBody(),
        ], JSON_UNESCAPED_UNICODE));

        $server = $this->payApp->getServer();
        $server->handlePaid(function (PayMessage $message, \Closure $next) use ($paidHandler, $traceId) {
            // 【日志2】解密后的业务数据(含 out_trade_no / trade_state / amount)
            Log::info('微信支付回调[解密数据] trace=' . $traceId . ' ' . json_encode($message->toArray(), JSON_UNESCAPED_UNICODE));

            // 回调签名验证(官方推荐,验签失败抛异常 -> serve 返回失败,微信将重试)
            try {
                $this->payApp->getValidator()->validate($this->payApp->getRequest());
                Log::info('微信支付回调[验签通过] trace=' . $traceId);
            } catch (\Throwable $e) {
                Log::error('微信支付回调[验签失败] trace=' . $traceId . ' msg=' . $e->getMessage());
                throw $e;
            }

            try {
                $paidHandler($message, $traceId);
            } catch (\Throwable $e) {
                Log::error('微信支付回调[业务处理异常] trace=' . $traceId . ' msg=' . $e->getMessage()
                    . ' file=' . $e->getFile() . ':' . $e->getLine());
                throw $e;
            }

            Log::info('微信支付回调[业务处理完成] trace=' . $traceId);

            return $next($message);
        });

        $response = $server->serve();
        // 注意:先转字符串(内部会 seek(0))并 rewind,保证控制器后续仍能读取 body 回给微信
        $responseBody = (string)$response->getBody();
        $response->getBody()->rewind();

        // 【日志3】应答给微信的结果:status=200 且 code=SUCCESS 才算回调成功
        Log::info('微信支付回调[响应微信] trace=' . $traceId . ' status=' . $response->getStatusCode() . ' body=' . $responseBody);

        return $response;
    }

    /**
     * 提取回调请求中与验签相关的请求头(便于排查签名/证书问题)
     * @param \Psr\Http\Message\ServerRequestInterface $request
     * @return array
     */
    private static function getNotifyHeaders($request): array
    {
        $headers = [];
        foreach ($request->getHeaders() as $name => $values) {
            if (stripos($name, 'wechatpay') !== false || in_array(strtolower($name), ['content-type', 'user-agent'])) {
                $headers[$name] = implode(', ', $values);
            }
        }

        return $headers;
    }
}