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package org.ufcspa.simdecs.diagram.util;

import java.io.File;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import org.apache.commons.lang3.text.WordUtils;

/**
 *
 * @author maroni
 */
public class ReflectionUtils {
    
    public static Class[] getClasses(String packageName) throws ClassNotFoundException, IOException {
        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()));
        }
        ArrayList<Class> classes = new ArrayList<Class>();
        for (File directory : dirs) {
            classes.addAll(findClasses(directory, packageName));
        }
        return classes.toArray(new Class[classes.size()]);
    }

    private static List<Class> findClasses(File directory, String packageName) throws ClassNotFoundException {
        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")) {
                classes.add(Class.forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6)));
            }
        }
        return classes;
    }

    public static Method getSetterMethod(Class reflectClass, Field field) {
        for (Method method : reflectClass.getMethods()) {
            if (method.getName().equals("set" + WordUtils.capitalize(field.getName()))) {
                return method;
            }
        }
        
        return null;
    }

    public static Method getGetterMethod(Class reflectClass, Field field) {
        for (Method method : reflectClass.getMethods()) {
            if (method.getName().equals("get" + WordUtils.capitalize(field.getName()))) {
                return method;
            }
        }
        
        return null;
    }
    
}