/* The contents of this file are subject to the license and copyright terms
 * detailed in the license directory at the root of the source tree (also
 * available online at http://fedora-commons.org/license/).
 */
package fedora.server.security.servletfilters.xmluserfile;

import java.beans.IntrospectionException;

import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.io.Writer;

import java.net.URI;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.betwixt.io.BeanReader;
import org.apache.commons.betwixt.io.BeanWriter;

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import fedora.common.Constants;

public class FedoraUsers
        implements Serializable, Constants {

    private static final long serialVersionUID = 1L;

    private static final String BETWIXT_MAPPING =
            "/fedora/server/security/servletfilters/xmluserfile/fedorausers-mapping.xml";

    private final List<Role> roles;

    private final List<User> users;

    public static File fedoraUsersXML = getFedoraUsersXML();

    private static File getFedoraUsersXML() {
        String homeConfig =
                FEDORA_HOME + File.separator + "server" + File.separator
                        + "config" + File.separator + "fedora-users.xml";
        String testConfig = "src/main/resources/fcfg/server/fedora-users.xml";
        fedoraUsersXML = new File(homeConfig);
        if (!fedoraUsersXML.exists()) {
            fedoraUsersXML = new File(testConfig);
        }
        return fedoraUsersXML;
    }

    public FedoraUsers() {
        roles = new ArrayList<Role>();
        users = new ArrayList<User>();
    }

    public static FedoraUsers getInstance() {
        return getInstance(fedoraUsersXML.toURI());
    }

    public static FedoraUsers getInstance(URI fedoraUsersXML) {
        FedoraUsers fu = null;
        BeanReader reader = new BeanReader();
        reader.getXMLIntrospector().getConfiguration()
                .setAttributesForPrimitives(false);
        reader.getBindingConfiguration().setMapIDs(false);

        try {
            reader.registerMultiMapping(getBetwixtMapping());
            fu = (FedoraUsers) reader.parse(fedoraUsersXML.toString());
        } catch (IntrospectionException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return fu;
    }

    public List<Role> getRoles() {
        return roles;
    }

    public List<User> getUsers() {
        return users;
    }

    public void addRole(Role role) {
        roles.add(role);
    }

    public void addUser(User user) {
        users.add(user);
    }

    public void write(Writer outputWriter) throws IOException {
        outputWriter.write("<?xml version='1.0' ?>\n");

        BeanWriter beanWriter = new BeanWriter(outputWriter);
        beanWriter.getBindingConfiguration().setMapIDs(false);
        beanWriter.setWriteEmptyElements(false);
        beanWriter.enablePrettyPrint();
        try {
            beanWriter.getXMLIntrospector().register(getBetwixtMapping());
            beanWriter.write("users", this);
        } catch (IntrospectionException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        beanWriter.flush();
        beanWriter.close();
    }

    private static InputSource getBetwixtMapping() {
        return new InputSource(FedoraUsers.class
                .getResourceAsStream(BETWIXT_MAPPING));
    }
}