<?php

if (!defined('IN_ONLINE')) {
    exit('Access Denied');
}

/**
 * Description of utilsclass
 *
 * @author Administrator
 */
class utils {
    private static $cachedToken = null;
    private static $tokenExpiryTime = 0;

    /**
     * 获取文件
    */
    public static function getEdocFile($hbol,$docTypes){
        try {
            $result = null;
            $data = [
                'fromStation' => '',
                'hbol'        => $hbol,
                'docTypes'    => $docTypes
            ];

            $accessTokenUrl = 'http://dms.kln.com/keycloak/realms/dsms-realm/protocol/openid-connect/token';
            //prod 账号
            $grant_type = 'client_credentials';
            $client_id = 'online';
            $client_secret = 'ouuRZ8QbIrcqKZi0NBJLt7PUEiRr5uXd';
            $accessToken = utils::getAccessToken($accessTokenUrl,$grant_type,$client_id,$client_secret);
            if ($accessToken === null) {
                throw new Exception("Failed to obtain access token");
            }

            $New_Dms_Url = 'http://dms.kln.com/edoc/documents/fileList'; 
            $result = utils::CURLClient($New_Dms_Url,$accessToken,$data);
        } catch (Exception $e) {
            error_log("Error in downloadFiles: " . $e->getMessage());
        }
        return $result;
        
    }

    public static function getAccessToken($accessTokenUrl,$grant_type,$client_id,$client_secret){
        if (self::$cachedToken !== null && time() * 1000 < self::$tokenExpiryTime) {
            return self::$cachedToken;
        }

        $postData = http_build_query([
            'grant_type' => $grant_type,
            'client_id' => $client_id,
            'client_secret' => $client_secret
        ]);

        $headers = [
            'Content-Type: application/x-www-form-urlencoded',
            'Accept: application/json'
        ];

        $curlInit = curl_init();

        curl_setopt_array($curlInit, [
            CURLOPT_URL            => $accessTokenUrl,
            CURLOPT_POST           => true,
            CURLOPT_POSTFIELDS     => $postData,
            CURLOPT_HTTPHEADER     => $headers,
            CURLOPT_RETURNTRANSFER => true,  // 关键！返回字符串而不是输出
            CURLOPT_SSL_VERIFYPEER => false, // 生产环境建议开启
            CURLOPT_TIMEOUT        => 30,
            CURLOPT_HEADER         => false,  // 不返回 header
        ]);

        $response = curl_exec($curlInit);
        $httpCode = curl_getinfo($curlInit, CURLINFO_HTTP_CODE);

        // 关闭 cURL
        curl_close($curlInit);

        // 解析响应
        if ($httpCode === 200) {
            $jsonResponse = json_decode($response, true);
            if (isset($jsonResponse['access_token'])) {
                self::$cachedToken = $jsonResponse['access_token'];
                //计算过期时间，但是换算成毫秒*1000
                $expiresIn = isset($jsonResponse['expires_in']) ? $jsonResponse['expires_in'] * 1000 : 0;
                self::$tokenExpiryTime = (time() * 1000) + $expiresIn - 300000;
                return self::$cachedToken;
            } 
        } 
        self::$cachedToken = null;
        self::$tokenExpiryTime = 0;
        return null;
    }

    /**
     * 使用 cURL
    */
    public static function CURLClient($url,$accessToken,$data){
        $headers = [
            'Authorization: Bearer ' . $accessToken,
            'Content-Type: application/json',
            'Accept: ' . 'application/json'
        ];
        //$url = 'http://dsms-alb-internet-facing-449737170.ap-southeast-1.elb.amazonaws.com/edoc/documents/fileList';
        //$url = 'http://dms.kln.com/edoc/documents/fileList';
        // 将数据编码为 JSON
        $jsonData = json_encode($data);
        try {
            $curlInit = curl_init();

            curl_setopt_array($curlInit, [
                CURLOPT_URL            => $url,
                CURLOPT_POST           => true,
                CURLOPT_POSTFIELDS     => $jsonData,
                CURLOPT_HTTPHEADER     => $headers,
                CURLOPT_RETURNTRANSFER => true,  // 关键！返回字符串而不是输出
                CURLOPT_SSL_VERIFYPEER => false, // 生产环境建议开启
                CURLOPT_TIMEOUT        => 30,
                CURLOPT_HEADER         => false,  // 不返回 header
            ]);

            $response = curl_exec($curlInit);
            // 检查是否有错误
            if ($response === false) {
                $error = curl_error($curlInit);
                error_log("cURL 请求失败: " . $error);
                throw new Exception("cURL 请求失败: " . $error);
            }
            // 获取 HTTP 状态码
            $httpCode = curl_getinfo($curlInit, CURLINFO_HTTP_CODE);
            // 关闭 cURL
            curl_close($curlInit);
            // 解析响应
            $result = json_decode($response, true);
            if ($httpCode == 200 && isset($result['data'])) {
                return json_encode($result['data'], JSON_UNESCAPED_UNICODE);
            }else{
                return null;
            }
        } catch (Exception $e) {
            error_log($e->getMessage());
        }
    }

}
?>