/**
 * @author Carlos Gonzalez Pereira (cgmp@mega.ist.utl.pt)
 */
package net.sourceforge.fenixedu.util;

import java.lang.reflect.Constructor;
import java.util.Collection;

import net.sourceforge.fenixedu._development.PropertiesManager;
import net.sourceforge.fenixedu.domain.Person;
import net.sourceforge.fenixedu.domain.Role;
import net.sourceforge.fenixedu.domain.person.RoleType;

import com.linkare.commons.metainfo.Linkare;

/**
 * 
 * This class is responsible for handling all complex operations done to the
 * username
 * 
 * @author - Carlos Gonzalez Pereira (cgmp@mega.ist.utl.pt)
 * 
 */
@Linkare(author = "Paulo Zenida", comments = "Changed the implementation so that the actual logic is delegated to another class, which must implement the interface IUsernameUtils")
public class UsernameUtils extends FenixUtil {

    private static final String USERNAME_UTILS_CLASS = "username.utils.class";

    private static final String USERNAME_UTILS_CLASS_NAME = PropertiesManager.getProperty(USERNAME_UTILS_CLASS);

    private static final long serialVersionUID = 1L;

    private static Class<? extends IUsernameUtils> usernameUtilsClass;

    private static IUsernameUtils delegator;

    static {
	delegator = DefaultUsernameUtils.getInstance();

	if (USERNAME_UTILS_CLASS_NAME != null) {
	    try {
		usernameUtilsClass = (Class<? extends IUsernameUtils>) Class.forName(USERNAME_UTILS_CLASS_NAME);
	    } catch (ClassNotFoundException e) {
		System.err.println("Username utils class " + usernameUtilsClass + " was not found");
		e.printStackTrace();
	    }
	    if (usernameUtilsClass != null && usernameUtilsClass != DefaultUsernameUtils.class) {
		try {
		    Constructor<? extends IUsernameUtils> constructor = usernameUtilsClass.getDeclaredConstructor();
		    boolean isAccessible = constructor.isAccessible();
		    delegator = constructor.newInstance();
		    constructor.setAccessible(isAccessible);
		} catch (Exception e) {
		    e.printStackTrace();
		}
	    }
	}
    }

    public static boolean shouldHaveUID(Person person) {
	return delegator.shouldHaveUID(person);
    }

    public static String updateIstUsername(Person person) {
	return delegator.updateInstitutionalUsername(person);
    }

    public static String generateNewUsername(RoleType roleType, Person person) {
	return delegator.generateNewUsername(roleType, person);
    }

    public static Role getMostImportantRole(Collection<Role> roles) {
	return delegator.getMostImportantRole(roles);
    }
}