package com.gs.xiaomi.service;

import cn.hutool.crypto.SmUtil;
import cn.hutool.crypto.digest.DigestUtil;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.gs.xiaomi.config.DataAcquisitionConfiguration;
import com.gs.xiaomi.dto.BCS101Request;
import com.gs.xiaomi.util.X5StringUtils;
import okhttp3.*;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.TimeUnit;

@Service
public class BCS101ApiService {

    private final OkHttpClient client;
    private final ObjectMapper objectMapper;

    public BCS101ApiService() {
        this.client = new OkHttpClient.Builder()
                .connectTimeout(3000, TimeUnit.SECONDS)
                .readTimeout(90, TimeUnit.SECONDS)
                .build();
        this.objectMapper = new ObjectMapper();
    }

    /**
     * 获取BCS101数据
     *
     * @param request BCS101请求参数
     * @return API响应
     * @throws IOException 网络异常
     *                     <p>
     *                     HTTP访问需要Baisc Auth(该账户为条码集成专用账户，密码切勿输入错误！）:
     *                     账户: RFCBCSXIAOBU
     *                     密码: L5X8!pdL
     *                     如何使用：
     *                     使用http 调用时需要根据账户密码增加http headers参数Authorization
     *                     对应的值为Basic bas64(账户:密码)
     *                     <p>
     *                     X5协议中使用的（国密算法）
     *                     对应appid和对应appkey请使用小米条码平台分配的对应的测试机信息：
     *                     APP ID：bcs_fty_177301
     *                     APP Key：IJBVGMJXG4ZTAMLSMFXGI33NONQWY5DG
     *                     <p>
     *                     HTTP HEADER参数:
     *                     Authorization  Basic XXXXX
     *                     同时请添加HTTP HEADER参数：
     *                     Content-Type  application/x-www-form-urlencoded
     *                     body选择raw，
     *                     数据格式为data=url编码(base64编码)的数据
     *                     </p>
     */
    public String getBCS101Data(BCS101Request request) throws IOException {
        // 直接将请求对象转换为JSON字符串
        String jsonData = objectMapper.writeValueAsString(request);

        // Base64编码
        String base64Data = X5StringUtils.encodeBase64(jsonData);

        // URL编码
        String urlEncodedData = URLEncoder.encode(base64Data, String.valueOf(StandardCharsets.UTF_8));

        // 构建form表单数据 - 按照注释要求：data=url编码(base64编码)的数据
        String formData = "data=" + urlEncodedData;

        // 构建Basic Auth - 使用专用条码集成账户
        String credentials = DataAcquisitionConfiguration.BCS_USER_NAME + ":" + DataAcquisitionConfiguration.BCS_PWD;
        String auth = X5StringUtils.encodeBase64(credentials);

        // 构建请求体 - Content-Type: application/x-www-form-urlencoded
        RequestBody body = RequestBody.create(formData, MediaType.parse("application/x-www-form-urlencoded"));

        // 构建请求 - 严格按照注释要求
        Request httpRequest = new Request.Builder()
                .url(DataAcquisitionConfiguration.BCS_101_URL)
                .method("POST", body)
                .addHeader("Content-Type", "application/x-www-form-urlencoded")
                .addHeader("Authorization", "Basic " + auth)
                .build();

        // 执行请求
        try (Response response = client.newCall(httpRequest).execute()) {
            if (response.body() != null) {
                String responseBody = response.body().string();
                // 记录响应信息用于调试
                System.out.println("BCS101 API响应状态: " + response.code());
                System.out.println("BCS101 API响应内容: " + responseBody);
                return responseBody;
            }
            throw new IOException("Empty response body");
        }
    }

    /**
     * 获取BCS101数据 - 带X5协议支持
     *
     * @param request  BCS101请求参数
     * @param enableX5 是否启用X5协议国密签名
     * @return API响应
     * @throws IOException 网络异常
     */
    public String getBCS101DataWithX5(BCS101Request request, boolean enableX5) throws IOException {
        // 直接将请求对象转换为JSON字符串
        String jsonData = objectMapper.writeValueAsString(request);

        // Base64编码
        String base64Data = X5StringUtils.encodeBase64(jsonData);

        // URL编码
        String urlEncodedData = URLEncoder.encode(base64Data, String.valueOf(StandardCharsets.UTF_8));

        // 构建form表单数据
        String formData = "data=" + urlEncodedData;

        // 构建Basic Auth
        String credentials = DataAcquisitionConfiguration.BCS_USER_NAME + ":" + DataAcquisitionConfiguration.BCS_PWD;
        String auth = X5StringUtils.encodeBase64(credentials);

        // 构建请求体
        RequestBody body = RequestBody.create(formData, MediaType.parse("application/x-www-form-urlencoded"));

        Request.Builder requestBuilder = new Request.Builder()
                .url(DataAcquisitionConfiguration.BCS_101_URL)
                .method("POST", body)
                .addHeader("Content-Type", "application/x-www-form-urlencoded")
                .addHeader("Authorization", "Basic " + auth);

        // 如果启用X5协议，添加国密签名
        if (enableX5) {
            String timestamp = String.valueOf(System.currentTimeMillis() / 1000);
            String signature = generateX5Signature(
                    DataAcquisitionConfiguration.BCS_APP_ID,
                    DataAcquisitionConfiguration.BCS_APP_Key,
                    timestamp,
                    formData
            );
            requestBuilder.addHeader("X-App-Id", DataAcquisitionConfiguration.BCS_APP_ID)
                    .addHeader("X-Timestamp", timestamp)
                    .addHeader("X-Signature", signature);
        }

        Request httpRequest = requestBuilder.build();

        // 执行请求
        try (Response response = client.newCall(httpRequest).execute()) {
            if (response.body() != null) {
                String responseBody = response.body().string();
                System.out.println("BCS101 API响应状态: " + response.code());
                System.out.println("BCS101 API响应内容: " + responseBody);
                return responseBody;
            }
            throw new IOException("Empty response body");
        }
    }

    /**
     * 生成X5协议签名 - 使用国密算法
     *
     * @param appId     APP ID
     * @param appKey    APP Key
     * @param timestamp 时间戳
     * @param data      请求数据
     * @return 签名字符串
     */
    private String generateX5Signature(String appId, String appKey, String timestamp, String data) {
        // X5协议国密算法签名: 尝试使用SM3，如果不支持则使用MD5
        String signString = appId + appKey + timestamp + data;
        try {
            // 尝试使用国密SM3算法
            return SmUtil.sm3(signString).toUpperCase();
        } catch (Exception e) {
            // 如果SM3不可用，fallback到MD5
            System.out.println("SM3算法不可用，使用MD5替代: " + e.getMessage());
            return DigestUtil.md5Hex(signString).toUpperCase();
        }
    }
}