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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.alipay.sofa.ark.common.util;

import com.alipay.sofa.ark.spi.constant.Constants;
import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.security.CodeSource;
import java.security.ProtectionDomain;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * @author qilong.zql
 * @since 0.3.0
 */
public class ClassUtils {

    /**
     * Get package name from a specified class name.
     *
     * @param className
     * @return
     */
    public static String getPackageName(String className) {
        AssertUtils.isFalse(StringUtils.isEmpty(className), "ClassName should not be empty!");
        int index = className.lastIndexOf('.');
        if (index > 0) {
            return className.substring(0, index);
        }
        return Constants.DEFAULT_PACKAGE;
    }

    /**
     * find all compiled classes in dir, ignore inner, anonymous and local classes
     * @param dir directory that stores class files
     * @return compiled class names
     */
    public static List collectClasses(File dir) throws IOException {
        List classNames = new ArrayList<>();
        Collection classFiles = FileUtils.listFiles(dir, new String[] { "class" }, true);
        String basePath = dir.getCanonicalPath();

        for (File classFile : classFiles) {
            // Get the relative file path starting after the classes directory
            String relativePath = classFile.getCanonicalPath().substring(basePath.length() + 1);

            // Convert file path to class name (replace file separators with dots and remove .class extension)
            String className = relativePath.replace(File.separatorChar, '.').replaceAll(
                "\\.class$", "");

            // skip inner, anonymous and local classes
            if (!className.contains("$")) {
                classNames.add(className);
            }
        }
        return classNames;
    }

    public static String getCodeBase(Class cls) {

        if (cls == null) {
            return null;
        }
        ProtectionDomain domain = cls.getProtectionDomain();
        if (domain == null) {
            return null;
        }
        CodeSource source = domain.getCodeSource();
        if (source == null) {
            return null;
        }
        URL location = source.getLocation();
        if (location == null) {
            return null;
        }
        return location.getFile();
    }
}