package com.ynxbd.wx.utils;

import com.ynxbd.common.helper.common.CodeHelper;
import com.ynxbd.common.helper.common.JsonHelper;
import lombok.extern.slf4j.Slf4j;

import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.UUID;

@Slf4j
public class MsgEncodeHelper {
    /**
     * BASE64加密
     *
     * @param obj 需要加密的字符串
     * @return 加密后的字符串
     */
    public static String encode(Object obj) {
        if (obj == null) return null;
        String encode;
        if (obj.getClass() != String.class) {
            encode = JsonHelper.toJsonString(obj);
        } else {
            encode = obj.toString();
        }

        if ("".equals(encode)) {
            return null;
        }

        encode = java.util.Base64.getEncoder().encodeToString(encode.getBytes(StandardCharsets.UTF_8));
        String uuid = CodeHelper.get24UUID().toUpperCase();
        String uBeg = uuid.substring(0, 12);
        String uEnd = uuid.substring(12);

        log.info("uuid={}, uBeg={}, uEnd={}", uuid, uBeg, uEnd);

        if (encode.length() > 25) {
            String begStr = encode.substring(0, 10);
            String endStr = encode.substring(encode.length() - 15, encode.length() - 5);
            String end = encode.substring(encode.length() - 5);
            String middle = encode.substring(10, encode.length() - 15);
            return uuid + endStr + middle + begStr + end;
        } else {
            encode = uuid + encode;
        }
        return encode;
    }


    // 判断是否只有数字和字母
    public static boolean isLetterDigit(String str) {
        return str.matches("^[a-z0-9A-Z]+$");
    }

    /**
     * 解密
     *
     * @param data 需要解密的字符串
     */
    public static String decodeEn(String data) {
        try {
            if (data == null) {
                return null;
            }
            int dataLen = data.length();
            if (dataLen > 32) { // 截取掉uuid
                data = data.substring(32);
            }
            if (dataLen > 57) { // 超过57位的需要调换前后位置
                String endStr = data.substring(0, 10);
                String begStr = data.substring(data.length() - 15, data.length() - 5);
                String middle = data.substring(10, data.length() - 15);
                String end = data.substring(data.length() - 5);
                data = begStr + middle + endStr + end;
            }
            String deData = new String(Base64.getDecoder().decode(data), StandardCharsets.UTF_8);// base64解密
            if (!isLetterDigit(deData)) {
                return null;
            }
            return deData;
        } catch (Exception e) {
            return null;
        }
    }

    public static void main(String[] args) {

        for (int i = 0; i < 100; i++) {
            long begTime = System.currentTimeMillis();
            String encode = encode("123");
            long endTime = System.currentTimeMillis();

            System.out.println(endTime - begTime);
        }
    }
}