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package cloud.agileframework.common.util.security;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.StringUtils;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

/**
 * @author 佟盟
 * @version 1.0
 * @since 1.0
 */
public class AesUtil {
    /**
     * 密钥算法
     */
    private static final String ALGORITHM = "AES";
    private static final String AES_CBC_PKCS_5_PADDING = "AES/CBC/PKCS5Padding";

    /**
     * 将byte[]转为各种进制的字符串
     *
     * @param bytes byte[]
     * @param radix 可以转换进制的范围，从Character.MIN_RADIX到Character.MAX_RADIX，超出范围后变为10进制
     * @return 转换后的字符串
     */
    public static String binary(byte[] bytes, int radix) {
        // 这里的1代表正数
        return new BigInteger(1, bytes).toString(radix);
    }

    /**
     * base 64 encode
     *
     * @param bytes 待编码的byte[]
     * @return 编码后的base 64 code
     */
    public static String base64Encode(byte[] bytes) {
        return Base64.encodeBase64String(bytes);
    }

    /**
     * base 64 decode
     *
     * @param base64Code 待解码的base 64 code
     * @return 解码后的byte[]
     */
    public static byte[] base64Decode(String base64Code) {
        return StringUtils.isEmpty(base64Code) ? null : Base64.decodeBase64(base64Code);
    }


    /**
     * AES加密
     *
     * @param content    待加密的内容
     * @param encryptKey 加密密钥
     * @return 加密后的byte[]
     */
    public static byte[] aesEncryptToBytes(String content, String encryptKey, String encryptIv, String algorithmstr)
            throws NoSuchPaddingException, NoSuchAlgorithmException, BadPaddingException, IllegalBlockSizeException, InvalidAlgorithmParameterException, InvalidKeyException {
        byte[] raw = encryptKey.getBytes(StandardCharsets.UTF_8);
        SecretKeySpec secretKeySpec = new SecretKeySpec(raw, ALGORITHM);
        Cipher cipher = Cipher.getInstance(algorithmstr);
        IvParameterSpec ivParameterSpec = new IvParameterSpec(encryptIv.getBytes(StandardCharsets.UTF_8));
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);
        return cipher.doFinal(content.getBytes(StandardCharsets.UTF_8));
    }


    /**
     * AES加密为base 64 code
     *
     * @param content    待加密的内容
     * @param encryptKey 加密密钥
     * @return 加密后的base 64 code
     */
    public static String aesEncrypt(String content, String encryptKey, String encryptIv, String algorithmstr)
            throws NoSuchPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException {
        return StringUtils.isEmpty(content) ? null : base64Encode(aesEncryptToBytes(content, encryptKey, encryptIv, algorithmstr));
    }

    /**
     * AES解密
     *
     * @param encryptBytes 待解密的byte[]
     * @param decryptKey   解密密钥
     * @return 解密后的String
     */
    public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey, String encryptIv, String algorithmstr)
            throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        byte[] raw = decryptKey.getBytes(StandardCharsets.US_ASCII);
        SecretKeySpec skeySpec = new SecretKeySpec(raw, ALGORITHM);

        Cipher cipher = Cipher.getInstance(algorithmstr);
        IvParameterSpec ivParameterSpec = new IvParameterSpec(encryptIv.getBytes(StandardCharsets.UTF_8));
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, ivParameterSpec);
        byte[] decryptBytes;
        decryptBytes = cipher.doFinal(encryptBytes);

        return new String(decryptBytes, StandardCharsets.UTF_8);
    }

    public static String aesEncrypt(String content, String encryptKey, String encryptIv)
            throws NoSuchPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException {
        return aesEncrypt(content, encryptKey, encryptIv, AES_CBC_PKCS_5_PADDING);
    }

    public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey, String encryptIv)
            throws InvalidAlgorithmParameterException, NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, BadPaddingException, IllegalBlockSizeException {
        return aesDecryptByBytes(encryptBytes, decryptKey, encryptIv, AES_CBC_PKCS_5_PADDING);
    }

    public static String aesDecrypt(String encryptStr, String decryptKey, String encryptIv) {
        return aesDecrypt(encryptStr, decryptKey, encryptIv, AES_CBC_PKCS_5_PADDING);
    }

    /**
     * 将base 64 code AES解密
     *
     * @param encryptStr 待解密的base 64 code
     * @param decryptKey 解密密钥
     * @return 解密后的string
     */
    public static String aesDecrypt(String encryptStr, String decryptKey, String encryptIv, String algorithmstr) {
        try {
            return StringUtils.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey, encryptIv, algorithmstr);
        } catch (Exception e) {
            return encryptStr;
        }
    }
}