<?php
// +----------------------------------------------------------------------
// | Niucloud-admin 企业快速开发的多应用管理平台
// +----------------------------------------------------------------------
// | 官方网址：https://www.niucloud.com
// +----------------------------------------------------------------------
// | niucloud团队 版权所有 开源版本可自由商用
// +----------------------------------------------------------------------
// | Author: Niucloud Team
// +----------------------------------------------------------------------

namespace app\service\api\login;

use app\model\sys\SysConfig;
use core\base\BaseService;
use core\exception\CommonException;
use think\facade\Cache;

/**
 * 微信服务类
 */
class WechatService extends BaseService
{
    /**
     * 获取微信公众号配置
     * @return array
     * @throws \Exception
     */
    private function getWechatConfig()
    {
        $config = new SysConfig();
        $wechatConfig = $config->where('config_key', 'WECHAT')->find();

        if (!$wechatConfig || empty($wechatConfig['value'])) {
            throw new CommonException('微信公众号未配置');
        }

        $configData = $wechatConfig['value'];

        // 如果是字符串，则解析JSON
        if (is_string($configData)) {
            $configData = json_decode($configData, true);
        }

        // 如果解析失败或不是数组，抛出异常
        if (!is_array($configData) || empty($configData['app_id']) || empty($configData['app_secret'])) {
            throw new CommonException('微信公众号配置不完整');
        }

        return $configData;
    }

    /**
     * 获取微信公众号授权URL
     * @param string $miniOpenid
     * @return array
     * @throws \Exception
     */
    public function getAuthUrl(string $miniOpenid)
    {
        $config = $this->getWechatConfig();
        
        // 生成state参数，用于传递小程序openid
        $state = base64_encode($miniOpenid);
        
        // 获取当前域名
        $domain = request()->domain();
        $redirectUri = $domain . '/api/wechat/callback';
        
        // 构建微信授权URL
        $authUrl = 'https://open.weixin.qq.com/connect/oauth2/authorize?' . http_build_query([
            'appid' => $config['app_id'],
            'redirect_uri' => urlencode($redirectUri),
            'response_type' => 'code',
            'scope' => 'snsapi_userinfo',
            'state' => $state
        ]) . '#wechat_redirect';
        
        return [
            'auth_url' => $authUrl,
            'redirect_uri' => $redirectUri
        ];
    }

    /**
     * 处理微信授权回调
     * @param string $code
     * @param string $state
     * @return array
     * @throws \Exception
     */
    public function handleCallback(string $code, string $state)
    {
        $config = $this->getWechatConfig();
        
        // 解析state获取小程序openid
        $miniOpenid = base64_decode($state);
        if (empty($miniOpenid)) {
            throw new CommonException('参数错误');
        }
        
        // 通过code获取access_token
        $tokenUrl = 'https://api.weixin.qq.com/sns/oauth2/access_token?' . http_build_query([
            'appid' => $config['app_id'],
            'secret' => $config['app_secret'],
            'code' => $code,
            'grant_type' => 'authorization_code'
        ]);
        
        $tokenResponse = $this->httpGet($tokenUrl);
        $tokenData = json_decode($tokenResponse, true);
        
        if (!$tokenData || isset($tokenData['errcode'])) {
            throw new CommonException('获取微信授权失败：' . ($tokenData['errmsg'] ?? '未知错误'));
        }
        
        $accessToken = $tokenData['access_token'];
        $wechatOpenid = $tokenData['openid'];
        
        // 获取用户信息
        $userInfoUrl = 'https://api.weixin.qq.com/sns/userinfo?' . http_build_query([
            'access_token' => $accessToken,
            'openid' => $wechatOpenid,
            'lang' => 'zh_CN'
        ]);
        
        $userInfoResponse = $this->httpGet($userInfoUrl);
        $userInfo = json_decode($userInfoResponse, true);
        
        if (!$userInfo || isset($userInfo['errcode'])) {
            throw new CommonException('获取微信用户信息失败：' . ($userInfo['errmsg'] ?? '未知错误'));
        }
        
        return [
            'mini_openid' => $miniOpenid,
            'wechat_openid' => $wechatOpenid,
            'nickname' => $userInfo['nickname'] ?? '',
            'avatar' => $userInfo['headimgurl'] ?? '',
            'sex' => $userInfo['sex'] ?? 0
        ];
    }

    /**
     * HTTP GET请求
     * @param string $url
     * @return string
     * @throws \Exception
     */
    private function httpGet(string $url)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
        
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $error = curl_error($ch);
        curl_close($ch);
        
        if ($response === false || !empty($error)) {
            throw new CommonException('网络请求失败：' . $error);
        }
        
        if ($httpCode !== 200) {
            throw new CommonException('网络请求失败，HTTP状态码：' . $httpCode);
        }
        
        return $response;
    }
}