package com.inet.ailink.receiver.common.utils;

import java.io.UnsupportedEncodingException;
import java.util.Base64;

//import com.google.common.primitives.Bytes;

public class Base64Util
{
	final static Base64.Decoder decoder = Base64.getDecoder();
	final static Base64.Encoder encoder = Base64.getEncoder();
	
    public Base64Util(){}
    
    /**
     * 解码
     * @param encoderStr
     * @return
     * @throws UnsupportedEncodingException 
     */
    public static String decoderString(String base64Text) throws UnsupportedEncodingException{
    	String result = "";
    	if(base64Text != null && !base64Text.isEmpty() && !base64Text.equals("")){
    		byte[] textByte = decoder.decode(base64Text);
    		result = bytes_String16(textByte);
    	}
    	return result;
    }
    
    /**
     * byte[]转16进制字符串
     * @param b
     * @return
     */
    public static String bytes_String16(byte[] b) {
    	StringBuilder sb = new StringBuilder();
    	for(int i=0;i<b.length;i++) {
        	sb.append(String.format("%02x", b[i]));
    	}
    	return sb.toString();
	}

    
    /**
     * 编码
     * @param encoderStr
     * @return
     * @throws UnsupportedEncodingException 
     */
    public static String encoderString(String base64Text) throws UnsupportedEncodingException{
    	String result = "";
    	if(base64Text != null && !base64Text.isEmpty() && !base64Text.equals("")){
    		byte[] textByte = base64Text.getBytes("UTF-8");
    		result = encoder.encodeToString(textByte);
    	}
    	return result;
    }
    
    /**
     * 编码
     * @param encoderStr
     * @return
     * @throws UnsupportedEncodingException 
     */
    public static String encoderString(byte[] textByte) throws UnsupportedEncodingException{
    	return encoder.encodeToString(textByte);
    }

    public static int getLength(String s) {
        int length = 0;
        for (int i = 0; i < s.length(); i++) {
            int ascii = Character.codePointAt(s, i);
            if (ascii >= 0 && ascii <= 255) {
                length++;
            } else {
                length += 2;
            }
        }
        return length;
    }
    
    private static String intToHex(int n) {
        StringBuffer s = new StringBuffer();
        String a;
        char []b = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
        while(n != 0){
            s = s.append(b[n%16]);
            n = n/16;            
        }
        a = s.reverse().toString();
        return a;
    }
    
    public static byte[] hexStrToByteArray(String str)
    {
        if (str == null) {
            return null;
        }
        if (str.length() == 0) {
            return new byte[0];
        }
        byte[] byteArray = new byte[str.length() / 2];
        for (int i = 0; i < byteArray.length; i++){
            String subStr = str.substring(2 * i, 2 * i + 2);
            byteArray[i] = ((byte)Integer.parseInt(subStr, 16));
        }
        return byteArray;
    }
    
    public static void main(String args[]) throws UnsupportedEncodingException
    {
    	//01 01 16  b7 28 32 18 4a 88 00 0e 00 00 00 00 42 4d 10 01 0a 00 13 05 07 e9
    	byte[] old =new byte[]{(byte)0x01
    			,(byte)0x01 ,(byte)0x16  ,(byte)0xb7 ,(byte)0x28 
    			,(byte)0x32 ,(byte)0x18 ,(byte)0x4a ,(byte)0x88 
    			,(byte)0x00 ,(byte)0x0e ,(byte)0x00 ,(byte)0x00 
    			,(byte)0x00 ,(byte)0x00 ,(byte)0x42 ,(byte)0x4d 
    			,(byte)0x10 ,(byte)0x01 ,(byte)0x0a ,(byte)0x00 
    			,(byte)0x13 ,(byte)0x05 ,(byte)0x07 ,(byte)0xe9};
    	//原始数据
    	System.out.println( "原始数据：");
    	for(byte i : old)
        	System.out.print(i + " ");
    	System.out.println();
    	//tea加密
    	byte[] teaDscrypt =TeaUtils.encrypt(old,null);
    	System.out.println( "tea加密：");
    	for(byte i : teaDscrypt)
        	System.out.print(i + " ");
    	System.out.println();
    	
    	//base编码
    	String base64Text = encoderString(teaDscrypt);
    	System.out.println("base64编码后的数据长度:"+getLength(base64Text)+"："+base64Text);
    	//base解码
    	String base64TextEn= decoderString(base64Text);
    	System.out.println("base64解码后的数据长度:"+getLength(base64TextEn)+"："+base64TextEn);
    	/*//转称byte数组(每两位一个16进制byte)
    	List<String> base64TeaByteOldList = new ArrayList<String>();
    	for(int i=0;i<base64TextEn.length();i++){
    		if(i%2 == 0){
    			base64TeaByteOldList.add("0x"+base64TextEn.charAt(i)+base64TextEn.charAt(i+1));
    		}
    	}
    	//解码后转换得到的list
    	System.out.println("解码后转换得到的list：");
    	for(String byte16:base64TeaByteOldList){
    		System.out.print(byte16+" ");
    	}
    	System.out.println();*/

    	//解码数据转换为byte数组
    	byte[] base64TeaByteOld = hexStrToByteArray(base64TextEn);
    	System.out.println( "解码后得到的tea加密的byte数组：");
    	for(byte i : base64TeaByteOld)
        	System.out.print(i + " ");
    	System.out.println();
    		
    	byte[] base64TeaByte =TeaUtils.decrypt(base64TeaByteOld,null);
    	
    	System.out.println( "tea解密：");
    	for(byte i : base64TeaByte)
        	System.out.print(i + " ");
    	System.out.println();
    }
}