package com.fuyuanshen.app.http;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * 获取阿里云TTS服务访问令牌
 */
public class TokenClient {
    
    public static String getAccessToken(String accessKeyId, String accessKeySecret) throws IOException {
        String endpoint = "https://nls-meta.cn-shanghai.aliyuncs.com/v1/token";
        
        URL url = new URL(endpoint);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        conn.setDoOutput(true);
        
        // 发送认证信息
        String params = String.format("grant_type=client_credentials&client_id=%s&client_secret=%s", 
                                     accessKeyId, accessKeySecret);
        
        try (OutputStream os = conn.getOutputStream()) {
            os.write(params.getBytes("UTF-8"));
        }
        
        int responseCode = conn.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            try (InputStream is = conn.getInputStream();
                 BufferedReader reader = new BufferedReader(new InputStreamReader(is))) {
                
                StringBuilder response = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    response.append(line);
                }
                
                // 解析响应获取token（实际需要使用JSON解析库）
                return response.toString().replaceAll(".*\"access_token\":\"([^\"]+)\".*", "$1");
            }
        } else {
            throw new IOException("获取令牌失败，状态码: " + responseCode);
        }
    }
}