package net.sourceforge.fenixedu.applicationTier.Servico.externalServices;

import java.util.HashSet;
import java.util.Set;

import net.sourceforge.fenixedu._development.PropertiesManager;
import net.sourceforge.fenixedu.applicationTier.FenixService;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.FenixServiceException;
import net.sourceforge.fenixedu.domain.Person;
import net.sourceforge.fenixedu.domain.User;

import org.apache.commons.lang.StringUtils;

import pt.ist.fenixWebFramework.services.Service;

public class SetEmail extends FenixService {

    public static class NotAuthorizedException extends FenixServiceException {
    }

    public class UserAlreadyHasEmailException extends FenixServiceException {

	private final String email;

	public UserAlreadyHasEmailException(final String email) {
	    this.email = email;
	}

	public String getEmail() {
	    return email;
	}

    }

    public static class UserDoesNotExistException extends FenixServiceException {

    }

    private static final Set<String> allowedHosts = new HashSet<String>();
    private static final String password;
    static {
	final String allowedHostString = PropertiesManager.getProperty("email.admin.allowed.hosts");
	if (allowedHostString != null) {
	    final String[] allowedHostTokens = allowedHostString.split(",");
	    for (int i = 0; i < allowedHostTokens.length; i++) {
		allowedHosts.add(allowedHostTokens[i]);
	    }
	}
	password = PropertiesManager.getProperty("email.admin.password");
    }

    public static boolean isAllowed(final String host, final String ip, final String password) {
	return SetEmail.password != null && SetEmail.password.equals(password)
		&& (allowedHosts.contains(host) || allowedHosts.contains(ip));
    }

    private static void set(final String userUId, final String email) throws FenixServiceException {
	final User user = User.readUserByUserUId(userUId);
	if (user == null) {
	    throw new UserDoesNotExistException();
	}
	final Person person = user.getPerson();
	if (person == null) {
	    throw new UserDoesNotExistException();
	}
	final String newEmail = StringUtils.isEmpty(email) ? null : email;
	person.setInstitutionalEmailAddressValue(newEmail);
    }

    @Service
    public static void run(final String host, final String ip, final String password, final String userUId, final String email)
	    throws FenixServiceException {
	if (isAllowed(host, ip, password)) {
	    set(userUId, email);
	} else {
	    throw new NotAuthorizedException();
	}
    }

}