package com.gs.xiaomi.service;

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
     *                     接口返回
     *                     Error: ERROR_IN_MODULECHAIN;ERROR_IN_MODULECHAIN, Sender Channel 'CC_MI_OEM_HTTP_OUT' (ID: a58369adbaa03aafb76d2c02c2ae7cd7): Catching exception calling messaging system
     *                     我是需要X5协议的， 我看你没有为我添加
     *                     APP ID：bcs_fty_177301
     *                     APP Key：IJBVGMJXG4ZTAMLSMFXGI33NONQWY5DG
     */
    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
        String formData = "data=" + urlEncodedData;

        // 生成时间戳
        String timestamp = String.valueOf(System.currentTimeMillis() / 1000);

        // 生成X5签名
        String signature = generateX5Signature(
                DataAcquisitionConfiguration.BCS_APP_ID,
                DataAcquisitionConfiguration.BCS_APP_Key,
                timestamp,
                formData
        );

        // 构建Authorization header
        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"));

        // 构建请求
        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)
                .addHeader("X-App-Id", DataAcquisitionConfiguration.BCS_APP_ID)
                .addHeader("X-Timestamp", timestamp)
                .addHeader("X-Signature", signature)
                .build();

        // 执行请求
        try (Response response = client.newCall(httpRequest).execute()) {
            if (response.body() != null) {
                return response.body().string();
            }
            throw new IOException("Empty response body");
        }
    }

    /**
     * 生成X5协议签名
     *
     * @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签名算法: MD5(appId + appKey + timestamp + data)
        String signString = appId + appKey + timestamp + data;
        return DigestUtil.md5Hex(signString).toUpperCase();
    }
}