/*
 * Copyright (c) 2011-2024, baomidou (jobob@qq.com).
 *
 * 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
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.baomidou.mybatisplus.core;

import java.io.File;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.security.CodeSource;
import java.util.jar.Attributes;
import java.util.jar.JarFile;

/**
 * 获取Mybatis-Plus版本
 *
 * @author zengzhihong
 */
public class MybatisPlusVersion {

    private MybatisPlusVersion() {
    }

    public static String getVersion() {
        return determineSpringBootVersion();
    }

    private static String determineSpringBootVersion() {
        final Package pkg = MybatisPlusVersion.class.getPackage();
        if (pkg != null && pkg.getImplementationVersion() != null) {
            return pkg.getImplementationVersion();
        }
        CodeSource codeSource = MybatisPlusVersion.class.getProtectionDomain().getCodeSource();
        if (codeSource == null) {
            return null;
        }
        URL codeSourceLocation = codeSource.getLocation();
        try {
            URLConnection connection = codeSourceLocation.openConnection();
            if (connection instanceof JarURLConnection) {
                return getImplementationVersion(((JarURLConnection) connection).getJarFile());
            }
            try (JarFile jarFile = new JarFile(new File(codeSourceLocation.toURI()))) {
                return getImplementationVersion(jarFile);
            }
        } catch (Exception ex) {
            return null;
        }
    }

    private static String getImplementationVersion(JarFile jarFile) throws IOException {
        return jarFile.getManifest().getMainAttributes().getValue(Attributes.Name.IMPLEMENTATION_VERSION);
    }

}
