<?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;

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';
        }
        
        // 提取关键信息
        $fromUsername = (string)$xml->FromUserName;  // 用户的公众号OpenID
        $toUsername = (string)$xml->ToUserName;      // 公众号原始ID
        $event = (string)$xml->Event;                 // 事件类型
        $eventKey = (string)$xml->EventKey;           // 事件KEY值（扫码关注时会有）
        
        // 记录日志，方便调试
        Log::info('wechat_subscribe_info', '微信关注事件', [
            'FromUserName' => $fromUsername, 
            'ToUserName' => $toUsername, 
            'event' => $event, 
            'eventKey' => $eventKey
        ]);
        
        // 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);
                $unionid = isset($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();
                        Log::info('wechat_subscribe_success', '绑定成功', ['unionid' => $unionid, 'openid' => $fromUsername]);
                    }
                } 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';
    }

    /**
     * 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';
        }
    }
}