/*
 *  Copyright (c) 2023-2026, Easy-Agents (fuhai999@gmail.com).
 *  <p>
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  <p>
 *  http://www.apache.org/licenses/LICENSE-2.0
 *  <p>
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.easyagents.core.util;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.util.Base64;

public class HashUtil {
    private static final char[] HEX_DIGITS = "0123456789abcdef".toCharArray();
    private static final char[] CHAR_ARRAY = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();

    public static String md5(String srcStr) {
        return hash("MD5", srcStr);
    }


    public static String sha256(String srcStr) {
        return hash("SHA-256", srcStr);
    }

    public static String hmacSHA256ToBase64(String content, String secret) {
        try {
            Mac hmacSHA256 = Mac.getInstance("HmacSHA256");
            SecretKeySpec secretKey = new SecretKeySpec(secret.getBytes(StandardCharsets.UTF_8), "HmacSHA256");
            hmacSHA256.init(secretKey);
            byte[] bytes = hmacSHA256.doFinal(content.getBytes(StandardCharsets.UTF_8));
            return Base64.getEncoder().encodeToString(bytes);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static String hash(String algorithm, String srcStr) {
        try {
            MessageDigest md = MessageDigest.getInstance(algorithm);
            byte[] bytes = md.digest(srcStr.getBytes(StandardCharsets.UTF_8));
            return bytesToHex(bytes);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static String bytesToHex(byte[] bytes) {
        StringBuilder ret = new StringBuilder(bytes.length * 2);
        for (byte aByte : bytes) {
            ret.append(HEX_DIGITS[(aByte >> 4) & 0x0f]);
            ret.append(HEX_DIGITS[aByte & 0x0f]);
        }
        return ret.toString();
    }



}
