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package cq.web.utils;

import java.io.File;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class ClassUtils {
    /**
     * 获取某包下所有类
     *
     * @param packageName 包名
     * @param isRecursion 是否遍历子包
     * @return 类的完整名称
     */
    public static Set getClassName(String packageName, boolean isRecursion) {
        Set classNames = null;
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        String packagePath = packageName.replace(".", "/");
        URL url = loader.getResource(packagePath);
        if (url != null) {
            String protocol = url.getProtocol();
            if (protocol.equals("file")) {
                classNames = getClassNameFromDir(url.getPath(), packageName, isRecursion);
            } else if (protocol.equals("jar")) {
                JarFile jarFile = null;
                try {
                    jarFile = ((JarURLConnection) url.openConnection()).getJarFile();
                } catch (Exception e) {
                    e.printStackTrace();
                }
                if (jarFile != null) {
                    getClassNameFromJar(jarFile.entries(), packageName, isRecursion);
                }
            }
        } else {
            classNames = getClassNameFromJars(((URLClassLoader) loader).getURLs(), packageName, isRecursion);
        }
        return classNames;
    }

    /**
     * 从项目文件获取某包下所有类
     *
     * @param filePath    文件路径
     * @param packageName 包名
     * @param isRecursion 是否遍历子包
     * @return 类的完整名称
     */
    private static Set getClassNameFromDir(String filePath, String packageName, boolean isRecursion) {
        Set className = new HashSet<>();
        File file = new File(filePath);
        File[] files = file.listFiles();
        for (File childFile : files) {
            if (childFile.isDirectory()) {
                if (isRecursion) {
                    className.addAll(getClassNameFromDir(childFile.getPath(), packageName + "." + childFile.getName(),
                            isRecursion));
                }
            } else {
                String fileName = childFile.getName();
                if (fileName.endsWith(".class") && !fileName.contains("$")) {
                    className.add(packageName + "." + fileName.replace(".class", ""));
                }
            }
        }
        return className;
    }

    /**
     * @param jarEntries
     * @param packageName
     * @param isRecursion
     * @return
     */
    private static Set getClassNameFromJar(Enumeration jarEntries, String packageName,
                                                   boolean isRecursion) {
        Set classNames = new HashSet<>();
        while (jarEntries.hasMoreElements()) {
            JarEntry jarEntry = jarEntries.nextElement();
            if (!jarEntry.isDirectory()) {
                String entryName = jarEntry.getName().replace("/", ".");
                if (entryName.endsWith(".class") && !entryName.contains("$") && entryName.startsWith(packageName)) {
                    entryName = entryName.replace(".class", "");
                    if (isRecursion) {
                        classNames.add(entryName);
                    } else if (!entryName.replace(packageName + ".", "").contains(".")) {
                        classNames.add(entryName);
                    }
                }
            }
        }
        return classNames;
    }

    /**
     * 从所有jar中搜索该包，并获取该包下所有类
     *
     * @param urls        URL集合
     * @param packageName 包路径
     * @param isRecursion 是否遍历子包
     * @return 类的完整名称
     */
    private static Set getClassNameFromJars(URL[] urls, String packageName, boolean isRecursion) {
        Set classNames = new HashSet();
        for (int i = 0; i < urls.length; i++) {
            String classPath = urls[i].getPath();
            if (classPath.endsWith("classes/")) {
                continue;
            }
            JarFile jarFile = null;
            try {
                jarFile = new JarFile(classPath.substring(classPath.indexOf("/")));
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (jarFile != null) {
                classNames.addAll(getClassNameFromJar(jarFile.entries(), packageName, isRecursion));
            }
        }
        return classNames;
    }

}