<?php

namespace App\Http\Controllers\Api\Wechat;

use App\Http\Controllers\Controller;
use App\Models\Api\Personnel\EmployeeOpenid as EmployeeOpenidModel;
use App\Facades\Servers\Logs\Log;
use App\Servers\Wechat\Official;
use App\Jobs\Manager\Process\SubscriptionJobs;

class OfficialNotify extends Controller
{
    /**
     * 公众号关注回调 - 自动绑定用户公众号OpenID
     * @author 唐远望
     * @version 1.0
     * @date 2026-03-10
     */
    public function callback(EmployeeOpenidModel $EmployeeOpenidModel)
    {
        // 1. 处理微信服务器验证（GET请求）
        if ($_SERVER['REQUEST_METHOD'] === 'GET') {
            return $this->checkSignature();
        }

        // 2. 处理微信事件推送（POST请求）
        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            return $this->handleEvent($EmployeeOpenidModel);
        }

        return 'success';
    }

    /**
     * 处理微信事件
     */
    private function handleEvent($EmployeeOpenidModel)
    {
        // 获取微信推送的原始数据
        $xmlData = file_get_contents('php://input');
        $xml = simplexml_load_string($xmlData, 'SimpleXMLElement', LIBXML_NOCDATA);

        if (!$xml) {
            return 'success';
        }
        $xmlData = $this->xmlToArray($xmlData);
        $response_data_xml = $this->decryptMsg($xmlData['Encrypt']);
        $response_data = $this->xmlToArray($response_data_xml);
        Log::info('wechat_subscribe_info', '微信公众号事件,解密内容', ['xmlData' => $xmlData, 'response_data' => $response_data]);

        // 提取关键信息
        $fromUsername = (string)$response_data['FromUserName'];  // 用户的公众号OpenID
        $toUsername = (string)$response_data['ToUserName'];      // 公众号原始ID
        $event = (string)$response_data['Event'];                 // 事件类型

        // 处理关注事件
        if ($event == 'subscribe') {
            try {
                // 尝试获取用户UnionID
                $Official = new Official();
                $official_user_info = $Official->getApp()->user->get($fromUsername);
                Log::info('wechat_subscribe_info', '微信公众号事件,获取用户信息', ['FromUserName' => $fromUsername, 'response_data' => $official_user_info]);
                $unionid = isset($official_user_info['unionid']) ? $official_user_info['unionid'] : '';

                if ($unionid) {
                    // 1. 有UnionID，直接绑定公众号OpenID
                    $user_open_data = $EmployeeOpenidModel->where(['unionid' => $unionid])->first();
                    if ($user_open_data) {
                        $user_open_data->official_openid = $fromUsername;
                        $user_open_data->save();
                    } else {
                        //新增记录
                        $insert_data = [
                            'unionid' => $unionid,
                            'official_openid' => $fromUsername,
                            'insert_time' => time(),
                            'type' => 1
                        ];
                        $EmployeeOpenidModel->insertGetId($insert_data);
                    }
                } else {
                    Log::info('wechat_subscribe_error', '获取UnionID失败', [
                        'data' => $fromUsername,
                        'request_data' => $official_user_info
                    ]);
                }
            } catch (\Exception $e) {
                Log::error('wechat_subscribe_exception', '处理异常', [
                    'error' => $e->getMessage()
                ]);
            }
        }

        // 重要：必须返回success
        return 'success';
    }

    /**
     * 解密消息
     */
    private function decryptMsg($encrypt)
    {
        try {
            // Base64解码
            $encrypted = base64_decode($encrypt);
            $encodingAesKey = config('wechat.openplat.aes_key', '');
            $appId = config('wechat.openplat.app_id', '');
            // 解密
            $key = base64_decode($encodingAesKey . '=');
            $iv = substr($key, 0, 16);

            $decrypted = openssl_decrypt(
                $encrypted,
                'AES-256-CBC',
                $key,
                OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING,
                $iv
            );

            // 去除填充的字符
            $pad = ord(substr($decrypted, -1));
            $decrypted = substr($decrypted, 0, -$pad);

            // 解析内容
            $content = substr($decrypted, 16); // 去掉16个随机字节
            $xmlLen = unpack('N', substr($content, 0, 4))[1];

            // 验证AppId
            $appId = substr($content, 4 + $xmlLen);
            if ($appId != $appId) {
                Log::error('wechat_appid_error', 'AppId不匹配', ['got' => $appId, 'expect' => $appId]);
                return false;
            }

            // 返回XML内容
            return substr($content, 4, $xmlLen);
        } catch (\Exception $e) {
            Log::error('wechat_decrypt_error', '解密异常', ['error' => $e->getMessage()]);
            return false;
        }
    }

    /**
     * 验证服务器地址有效性
     */
    private function checkSignature()
    {
        $signature = $_GET["signature"] ?? '';
        $timestamp = $_GET["timestamp"] ?? '';
        $nonce = $_GET["nonce"] ?? '';
        $echostr = $_GET["echostr"] ?? '';

        if (!$signature || !$timestamp || !$nonce) {
            return 'Invalid request';
        }

        $token = config('wechat.openplat.token', 'your_token_here');
        $tmpArr = [$token, $timestamp, $nonce];
        sort($tmpArr, SORT_STRING);
        $tmpStr = sha1(implode($tmpArr));

        if ($tmpStr == $signature) {
            return $echostr;  // 验证成功，返回echostr
        } else {
            return 'Invalid signature';
        }
    }

    /**
     * XML转数组
     * @param string $xml XML字符串
     * @return array
     */
    private function xmlToArray($xml)
    {
        // 禁止引用外部xml实体
        libxml_disable_entity_loader(true);

        // 加载XML字符串
        $xmlObject = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);

        if (!$xmlObject) {
            return [];
        }

        // 将SimpleXMLElement对象转换为JSON，再转换为数组
        $json = json_encode($xmlObject);
        $array = json_decode($json, true);

        return $array ?: [];
    }


    /**
     * 公众号测试消息订阅推送
     * @author 唐远望
     * @version 1.0
     * @date 2026-03-10
     */
    public function test()
    {
        $message_data = ['notice_type'=>'low_price_goods'];
        $response_data = SubscriptionJobs::dispatchSync($message_data);
        return json_send(['code' => 'success', 'msg' => '执行成功', 'data' => $response_data]);
    }
}