package com.rs.utilities;

import java.io.File;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

/**
 * A class that stores the essential utilities for the {@link File} resources used for the component handlers in-game.
 *
 * @author Abdallah Wahidi | Aug 22, 2017 : 10:52:19 PM
 */
public class FileUtils {

    /**
     * Gets and returns an array of classes in a specified package.
     *
     * @param packageName The package name to get the classes of.
     *
     * @return array of classes in package
     */
    @SuppressWarnings({ "rawtypes" })
    public static Class[] getClasses(String packageName) {
        try {
            ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
            assert classLoader != null;
            String path = packageName.replace('.', '/');
            Enumeration<URL> resources = classLoader.getResources(path);
            List<File> dirs = new ArrayList<File>();
            while (resources.hasMoreElements()) {
                URL resource = resources.nextElement();
                dirs.add(new File(resource.getFile().replaceAll("%20", " ")));
            }
            ArrayList<Class> classes = new ArrayList<Class>();
            for (File directory : dirs) {
                classes.addAll(findClasses(directory, packageName));
            }
            return classes.toArray(new Class[classes.size()]);
        } catch (Exception e) {

        }
        return null;
    }

    /**
     * Finds a list of classes in a specified directory.
     *
     * @param directory The directory to look in.
     *
     * @param packageName The name of the package that contains these classes.
     *
     * @return The {@code List} of classes
     */
    @SuppressWarnings("rawtypes")
    private static List<Class> findClasses(File directory, String packageName) {
        List<Class> classes = new ArrayList<Class>();
        if (!directory.exists()) {
            return classes;
        }
        File[] files = directory.listFiles();
        for (File file : files) {
            if (file.isDirectory()) {
                assert !file.getName().contains(".");
                classes.addAll(findClasses(file, packageName + "." + file.getName()));
            } else if (file.getName().endsWith(".class") && !file.getName().contains("$")) {
                try {
                    classes.add(Class.forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6)));
                } catch (Throwable e) {

                }
            }
        }
        return classes;
    }
}