package de.mpiwg.itgroup.annotations.restlet;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Hashtable;
import java.util.Properties;

import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import javax.servlet.ServletContext;

import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;
import org.restlet.Application;
import org.restlet.Context;
import org.restlet.Restlet;
import org.restlet.routing.Router;
import org.restlet.security.ChallengeAuthenticator;

import scala.sys.process.ProcessBuilderImpl.Dummy;

public class RestServer extends Application {

    public static Logger logger = Logger.getRootLogger();
    
    private ChallengeAuthenticator authenticator;

    /**
     * Properties holding consumer keys and secrets
     */
    private Properties consumerKeys;
    public final String CONSUMER_KEYS_PATH = "WEB-INF/consumerkeys.property";

    /**
     * constructor
     * 
     * @param parentContext
     */
    public RestServer(Context parentContext) {
        super(parentContext);

        Logger rl = Logger.getRootLogger();
        BasicConfigurator.configure();
        // read consumerKeys from webapp
        consumerKeys = new Properties();
        ServletContext sc = (ServletContext) getContext().getServerDispatcher()
                .getContext().getAttributes()
                .get("org.restlet.ext.servlet.ServletContext");
        if (sc != null) {
            InputStream ps = sc.getResourceAsStream(CONSUMER_KEYS_PATH);
            if (ps == null) {
                // try as file
                File pf = new File(sc.getRealPath(CONSUMER_KEYS_PATH));
                if (pf != null) {
                    rl.debug("trying file for consumer keys: "+pf);
                    try {
                        ps = new FileInputStream(pf);
                    } catch (FileNotFoundException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }
            if (ps != null) {
                rl.debug("loading consumer keys from "+CONSUMER_KEYS_PATH);
                try {
                    consumerKeys.load(ps);
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                rl.debug("consumer keys: "+consumerKeys);
            } else {
                rl.error("Unable to get resource "+CONSUMER_KEYS_PATH);
            }
        } else {
            rl.error("Unable to get ServletContext!");
        }
        
    }
    
    /**
     * returns consumer secret for consumer key.
     * returns null if consumer key doesn't exist.
     * @param consumerKey
     * @return
     */
    public String getConsumerSecret(String consumerKey) {
        return consumerKeys.getProperty(consumerKey);
    }


    /*
     * (non-Javadoc)
     * 
     * @see org.restlet.Application#createInboundRoot()
     */
    @Override
    public Restlet createInboundRoot() {
        //this.authenticator = createAuthenticator();

        // String target = "{rh}/{rf}/XX";
        // Redirector redirector = new
        // Redirector(getContext().createChildContext(), target,
        // Redirector.MODE_CLIENT_SEE_OTHER);

        Router router = new Router(getContext());
        /*
        router.attach("/annotator/annotations", AnnotatorAnnotations.class);
        router.attach("/annotator/annotations/{id}", AnnotatorAnnotations.class);
        router.attach("/annotator/search", AnnotatorSearch.class);
        
        // router.attach("",redirector);
        router.attach("/annotator", ExtendedAnnotationInput.class);
        */
        router.attach("/", AnnotatorInfo.class);
        //authenticator.setNext(router);
        //return authenticator;
        
        return router;
    }

    /**
     * Hole den vollen Benutzernamen aus dem LDAP
     * 
     * @param creator
     * @return
     */
    public String getUserNameFromLdap(String creator) {
        String retString = creator; // falls nichts gefunden wird einfach den
                                    // creator zurueckgeben
        Hashtable<String, String> env = new Hashtable<String, String>();
        String sp = "com.sun.jndi.ldap.LdapCtxFactory";
        env.put(javax.naming.Context.INITIAL_CONTEXT_FACTORY, sp);

        String ldapUrl = "ldap://ldapreplik.mpiwg-berlin.mpg.de/dc=mpiwg-berlin,dc=mpg,dc=de"; // TODO should go into config file
        env.put(javax.naming.Context.PROVIDER_URL, ldapUrl);

        DirContext dctx;
        try {
            dctx = new InitialDirContext(env);
        } catch (NamingException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
            return retString;
        }

        String base = "ou=People";

        SearchControls sc = new SearchControls();
        String[] attributeFilter = { "cn", "mail" };
        sc.setReturningAttributes(attributeFilter);
        sc.setSearchScope(SearchControls.SUBTREE_SCOPE);

        String filter = "(uid=" + creator + ")";

        try {
            NamingEnumeration<SearchResult> results = dctx.search(base, filter,
                    sc);
            while (results.hasMore()) {
                SearchResult sr = (SearchResult) results.next();
                javax.naming.directory.Attributes attrs = sr.getAttributes();

                Attribute attr = attrs.get("cn");
                retString = (String) attr.get();
            }
        } catch (NamingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        try {
            dctx.close();
        } catch (NamingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return retString;
    }

}