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package com.didiglobal.logi.security.util;

import org.springframework.util.StringUtils;

import java.util.Base64;

public class PWEncryptUtil {

    private final static int     TIMES = 3;
    private final static String  SALT0 = "{@VjJ4ak{[#@%d@#]}J6Rllh@}";
    private final static String  SALT1 = "Mv{#cdRgJ45Lqx}3IubEW87!==";
    private static final String  UTF8  = "UTF-8";


    private static String encode(int i, String pw) throws Exception {
        String temp     = pw + String.format( SALT0, i);
        String encodePW = Base64.getEncoder().encodeToString(temp.getBytes(UTF8));

        return encodePW;
    }

    public static String encode(String pw) throws Exception {
        if(StringUtils.isEmpty(pw)){ return pw; }

        if(pw.endsWith(SALT1)){ return pw; }

        for(int i = 1 ; i < TIMES + 1; i++){
            pw = encode(i, pw);
        }

        return pw + SALT1;
    }

    private static String decode(int i, String dpw) throws Exception {
        String temp = new String(Base64.getDecoder().decode(dpw), UTF8);

        int index = temp.indexOf(String.format( SALT0, i));

        return temp.substring(0, index);
    }

    public static String decode(String dpw) throws Exception {
        if(StringUtils.isEmpty(dpw)){ return dpw; }

        if(!dpw.endsWith(SALT1)){
            return dpw;
        }

        int indexSalt1 = dpw.indexOf(SALT1);
        dpw = dpw.substring(0, indexSalt1);

        for(int i = TIMES; i > 0 ; i--){
            dpw = decode(i, dpw);
        }

        return dpw;
    }

    public static void main(String[] args) throws Exception {
        String encode = PWEncryptUtil.encode("fwer2342234vcsf");
        String dpw    = PWEncryptUtil.decode(encode);
        System.out.println(encode + ":" + dpw);
        System.out.println(encode.length() + ":" + dpw);

    }
}