<?php
namespace app\utils;

// 引入极验 SDK 的核心类
use geetest\GeetestLib;
use app\model\System\SystemSiteSettings;

class Geetest
{
    /**
     * 极验 3.0 的 ID 和 KEY
     * 优先从系统配置表 SystemSiteSettings 中读取 geetest3ID / geetest3KEY
     */
    private $captchaId;
    private $privateKey;

    public function __construct()
    {
        // 默认值可以为空，避免硬编码
        $this->captchaId  = null;
        $this->privateKey = null;

        try {
            // 从系统设置表中读取极验3.0配置
            $settings = SystemSiteSettings::where('delete_time', null)
                ->whereIn('label', ['geetest3ID', 'geetest3KEY'])
                ->column('value', 'label');

            if (!empty($settings['geetest3ID']) && !empty($settings['geetest3KEY'])) {
                $this->captchaId  = $settings['geetest3ID'];
                $this->privateKey = $settings['geetest3KEY'];
            }
        } catch (\Throwable $e) {
            // 读取配置失败时，不抛出致命错误，留给上层决定是否启用极验
            error_log('加载极验配置失败: ' . $e->getMessage());
        }
    }

    /**
     * 初始化极验验证（前端获取验证参数）
     * @return string JSON 字符串
     */
    public function init()
    {
        $gtLib = new GeetestLib($this->captchaId, $this->privateKey);
        // 用户唯一标识（可传用户ID、IP等，不能为空）
        $userId = request()->ip();
        // 预处理验证
        $status = $gtLib->pre_process($userId);
        // 保存状态到 session
        session('gtserver', $status);
        session('gt_user_id', $userId);
        // 返回前端需要的验证参数
        return $gtLib->get_response_str();
    }

    /**
     * 验证前端提交的极验数据
     * @param array $data 前端提交的 geetest_challenge/validate/seccode
     * @return bool 验证结果
     */
    public function verify(array $data)
    {
        $gtLib = new GeetestLib($this->captchaId, $this->privateKey);
        $userId = session('gt_user_id');
        $status = session('gtserver');

        if ($status == 1) {
            // 正常模式验证
            $result = $gtLib->success_validate(
                $data['geetest_challenge'],
                $data['geetest_validate'],
                $data['geetest_seccode'],
                $userId
            );
        } else {
            // 宕机模式验证
            $result = $gtLib->fail_validate(
                $data['geetest_challenge'],
                $data['geetest_validate'],
                $data['geetest_seccode']
            );
        }
        return $result;
    }
}