package com.cdzy.user.utils;

import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONObject;
import com.cdp.product.security.context.SecurityContext;
import com.cdp.product.security.exception.DecryptFailureException;
import com.cdp.product.security.exception.EncryptFailureException;
import com.cdp.product.security.exception.SignFailureException;
import com.cdp.product.security.strategyImpl.SM2StrategyImpl;
import com.cdzy.common.model.response.JsonResult;
import com.cdzy.common.secure.SecureComponent;
import com.cdzy.common.secure.SecureSM2Component;

import com.cdzy.user.config.RealNameVerifyConfig;
import com.cdzy.user.config.WechatConfig;
import com.cdzy.user.model.dto.UserValidateDto;
import com.cdzy.user.model.entity.EbikeUser;
import com.cdzy.user.model.entity.EbikeUserRealInfo;
import com.cdzy.user.service.EbikeUserRealInfoService;
import com.cdzy.user.service.EbikeUserService;
import jakarta.annotation.Resource;
import lombok.extern.slf4j.Slf4j;
import okhttp3.*;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.springframework.stereotype.Service;


import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.security.*;
import java.time.LocalDateTime;
import java.util.*;

/**
 * 验证工具类
 *
 * @author dingchao
 * @date 2025/4/9
 * @modified by:
 */
@Slf4j
@Service
public class VerifyUtil {
    /**
     * 微信登录API地址
     */
    private static final String WECHAT_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";

    /**
     * 数据宝实名认证API地址
     */
    private static final String REALNAME_VERIFY_URL = "https://api.chinadatapay.com/communication/personal/1882";

    /**
     * OkHttpClient实例
     */
    private OkHttpClient client = null;

    @Resource
    private WechatConfig wechatConfig;

    @Resource
    private RealNameVerifyConfig realNameVerifyConfig;

    @Resource
    private EbikeUserService ebikeUserService;

    @Resource
    private EbikeUserRealInfoService ebikeUserRealInfoService;

    //暂时硬编码，后续放到redis或者config中【本地数据加密解密】
    private SecureComponent secureComponent;
    private static final String privateKey = "f8209a2ebe6691e41e1f2b667bfe71f0b511716cc0f7c4452502fc12ec3957e4";
    private static final String publicKey = "04f5084ee12767d932f293508e30e3b0100185042ec0f061dedaf92b793b93f79fd6179d5e47e25b7aec98e00cf90dd56df1f8191012537187e7bbfd2d1de299fc";

    // 加解密上下⽂
    private final SecurityContext securityContext;

    /**
     * 微信工具类构造函数。
     */
    public VerifyUtil() throws IOException {
        client = new OkHttpClient();
        securityContext = new SecurityContext();
        //设置加解密上下⽂类调⽤SM2加解密类
        securityContext.setSecurityImpl(new SM2StrategyImpl());
        //设置加解密上下⽂类调⽤SM2加解密类加签
        securityContext.setSign(new SM2StrategyImpl());
    }

    /**
     * 获取openId。
     *
     * @param code 微信登录返回的code
     * @return openId
     */
    public JSONObject wechatAuthority(String code) {
        Map<String, String> params = new HashMap<>();
        params.put("appid", wechatConfig.getAppId());
        params.put("secret", wechatConfig.getAppSecret());
        params.put("js_code", code);
        params.put("grant_type", "authorization_code");
        return httpGet("获取openId", WECHAT_LOGIN_URL, params);
    }

    /**
     * 解密微信用户信息。
     *
     * @param encryptedData 加密数据
     * @param sessionKey    会话密钥
     * @param iv            初始向量
     * @return 解密后的用户信息
     */
    public String decryptData(String encryptedData, String sessionKey, String iv) {
        try {
            // 添加 BouncyCastle 安全提供器
            Security.addProvider(new BouncyCastleProvider());

            // Base64 解码参数
            byte[] encryptedBytes = Base64.getDecoder().decode(encryptedData);
            byte[] sessionKeyBytes = Base64.getDecoder().decode(sessionKey);
            byte[] ivBytes = Base64.getDecoder().decode(iv);

            // 初始化 AES-CBC 解密器
            SecretKeySpec keySpec = new SecretKeySpec(sessionKeyBytes, "AES");
            IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding", "BC");
            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);

            // 执行解密
            byte[] decryptedBytes = cipher.doFinal(encryptedBytes);
            return new String(decryptedBytes, StandardCharsets.UTF_8);
        } catch (Exception e) {
            log.error("解密失败", e);
            return null;
        }
    }

    /**
     * 验证用户实名
     *
     * @param userValidateDto 验证用户实名请求
     * @return 验证结果
     */
    public JsonResult<?> verifyRealName(UserValidateDto userValidateDto) {
        EbikeUser ebikeUser = ebikeUserService.getById(userValidateDto.getUserId());
        if (ebikeUser == null) {
            log.error("用户不存在");
            return JsonResult.failed("用户不存在");
        }
        try {
            // 1. 加密数据
            Map<String, String> params = new HashMap<>();
            params.put("name", securityContext.encrypt(userValidateDto.getName(), realNameVerifyConfig.getServerPublicKey()));
            params.put("idcard", securityContext.encrypt(userValidateDto.getIdCard(), realNameVerifyConfig.getServerPublicKey()));
            params.put("timestamp", securityContext.encrypt(String.valueOf(System.currentTimeMillis()), realNameVerifyConfig.getServerPublicKey()));
            String sign = securityContext.sign(params, realNameVerifyConfig.getClientPrivateKey());
            params.put("sign", sign);
            params.put("key", realNameVerifyConfig.getApiKey());

            // 2. 验证用户实名
            JSONObject result = httpPost("验证用户实名", REALNAME_VERIFY_URL, params, null);
            log.info("验证用户实名结果:{}", result);
            if (result == null) {
                log.error("验证用户实名失败");
                return JsonResult.failed("验证用户实名失败");
            }
            if ("10000".equals(result.getString("code"))) {
                // 3. 解密结果
                String data = securityContext.decrypt(result.getString("data"), realNameVerifyConfig.getClientPrivateKey());
                JSONObject jsonData = JSON.parseObject(data);
                if ("1".equals(jsonData.getString("result"))) {
                    // 4. 更新用户实名信息
                    updateRealNameInfo(userValidateDto, true);
                    return JsonResult.success("验证用户实名成功");
                }
            }
            updateRealNameInfo(userValidateDto, false);
            log.error("验证用户实名失败,{} {}", result.getString("code"), result.getString("message"));
            return JsonResult.failed(result.getString("code") + ", " + result.getString("message"));
        } catch (EncryptFailureException e) {
            log.error("加密失败", e);
            return JsonResult.failed("加密失败");
        } catch (SignFailureException e) {
            log.error("签名失败", e);
            return JsonResult.failed("签名失败");
        } catch (DecryptFailureException e) {
            log.error("结果解密失败", e);
            return JsonResult.failed("结果解密失败");
        }
    }

    /**
     * 更新用户实名信息
     *
     * @param userValidateDto 用户验证信息
     * @param isValid         是否通过验证
     */
    private void updateRealNameInfo(UserValidateDto userValidateDto, boolean isValid) {
        EbikeUserRealInfo ebikeUserRealinfo = ebikeUserRealInfoService.getRealInfoByUserId(userValidateDto.getUserId());
        String realName = userValidateDto.getName();
        String idCard = userValidateDto.getIdCard();
        if (ebikeUserRealinfo == null) {
            ebikeUserRealinfo = new EbikeUserRealInfo();
            ebikeUserRealinfo.setUserId(userValidateDto.getUserId());
            ebikeUserRealinfo.setUserRealName(getSecureComponent().encrypt(realName, publicKey));
            ebikeUserRealinfo.setUserIdCard(getSecureComponent().encrypt(idCard, publicKey));
            ebikeUserRealinfo.setAttestationStatus(isValid ? 1L : 0L);
            ebikeUserRealinfo.setAuditTime(LocalDateTime.now());
            ebikeUserRealInfoService.save(ebikeUserRealinfo);
        } else {
            ebikeUserRealinfo.setUserRealName(getSecureComponent().encrypt(realName, publicKey));
            ebikeUserRealinfo.setUserIdCard(getSecureComponent().encrypt(idCard, publicKey));
            ebikeUserRealinfo.setAttestationStatus(isValid ?  1L: 0L);
            ebikeUserRealinfo.setAuditTime(LocalDateTime.now());
            ebikeUserRealInfoService.updateById(ebikeUserRealinfo);
        }
    }

    /**
     * 发送HTTP GET请求。
     *
     * @param func_  功能描述
     * @param url    请求URL
     * @param params 请求参数
     * @return 响应结果
     */
    private JSONObject httpGet(String func_, String url, Map<String, String> params) {
        StringJoiner paramJoiner = new StringJoiner("&");
        for (Map.Entry<String, String> entry : params.entrySet()) {
            paramJoiner.add(entry.getKey() + "=" + entry.getValue());
        }
        String requestUrl = url + "?" + paramJoiner.toString();
        Request request = new Request.Builder()
                .url(requestUrl)
                .get()
                .build();
        try (Response response = client.newCall(request).execute()) {
            if (response.isSuccessful()) {
                if (response.body() != null) {
                    return JSON.parseObject(response.body().string());
                }
                log.error("{}, 请求{}无返回结果", func_, url);
                return null;
            }
            if (response.body() != null) {
                log.error("{}, 请求{}失败, {}", func_, url, response.body().string());
            } else {
                log.error("{}, 请求{}失败", func_, url);
            }
            return null;
        } catch (Exception e) {
            log.error("{}, 请求{}失败", func_, url, e);
            return null;
        }
    }

    /**
     * 发送HTTP POST参数请求。
     *
     * @param func_  功能描述
     * @param url    请求URL
     * @param params 请求参数
     * @return 响应结果
     */
    private JSONObject httpPost(String func_, String url, Map<String, String> params, Map<String, Object> body) {
        StringJoiner paramJoiner = new StringJoiner("&");
        for (Map.Entry<String, String> entry : params.entrySet()) {
            paramJoiner.add(entry.getKey() + "=" + entry.getValue());
        }
        String requestUrl = url;
        if (paramJoiner.length() > 0)
            requestUrl += "?" + paramJoiner.toString();
        Request.Builder builder = new Request.Builder()
                .url(requestUrl);
        if (body != null) {
            MediaType typeJson = MediaType.parse("application/json; charset=utf-8");
            RequestBody requestBody = RequestBody.create(JSON.toJSONString(body), typeJson);
            builder.post(requestBody);
        } else {
            builder.post(RequestBody.create(null, new byte[0]));
        }
        Request request = builder.build();
        try (Response response = client.newCall(request).execute()) {
            if (response.isSuccessful()) {
                if (response.body() != null) {
                    return JSON.parseObject(response.body().string());
                }
                log.error("{}, 请求{}无返回结果", func_, url);
                return null;
            }
            if (response.body() != null) {
                log.error("{}, 请求{}失败, {}", func_, url, response.body().string());
            } else {
                log.error("{}, 请求{}失败", func_, url);
            }
            return null;
        } catch (Exception e) {
            log.error("{}, 请求{}失败", func_, url, e);
            return null;
        }
    }

    private SecureComponent getSecureComponent() {
        if (Objects.isNull(secureComponent)) {
            secureComponent = new SecureSM2Component();
        }
        return secureComponent;
    }

    /**
     * 解密用户真名
     *
     * @return 真名
     */
    public String decryptRealName(String name) throws DecryptFailureException {
        return securityContext.decrypt(name, privateKey);
    }
}