/* 
 * Copyright 2012 Tallinn University Centre for Educational Technology
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package ee.htk.dippler.app.service;

import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;

import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.sax.EndTextElementListener;
import android.sax.RootElement;
import android.util.Xml;

public class Connector {
	private static final String SOAP_ACTION = "http://backoffice.dippler.htk.tlu.ee/newUserSession";
    private static final String METHOD_NAME = "newUserSession";
    private static final String NAMESPACE = "http://backoffice.dippler.htk.tlu.ee/";
    private Context app_context = null;
    private SessionObject session;
    
    public Connector(Context context) {
    	app_context = context;
    }
    
    private Context getLocalContext() {
    	return app_context;
    }
    
    public String connect() {
    	SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getLocalContext());
    	
        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);  
        request.addProperty("email", prefs.getString("dippler-username", ""));
        request.addProperty("password", prefs.getString("dippler-password", ""));
        
        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
         
        envelope.setOutputSoapObject(request);

        //If preference not set, fallback to default URL
        HttpTransportSE ht = new HttpTransportSE(prefs.getString("dippler-bos-wsdl", "http://htk.tlu.ee/backoffice/BackOfficeService?wsdl"));
        
        try {
        	ht.call(SOAP_ACTION, envelope);
            SoapPrimitive response = (SoapPrimitive) envelope.getResponse();
            session = getSession(response.toString());
            return session.getId();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    
    public String getSessionId() {
    	if ( session != null ) {
    		return session.getId();
    	}
    	return null;
    }
    
    public SessionObject getSession() {
    	return this.session;
    }
    
    private SessionObject getSession(String raw_xml) {
		final SessionObject session = new SessionObject();
    	try {		
			final RootElement root = new RootElement("response"); 
		
			root.getChild("status").setEndTextElementListener(
					new EndTextElementListener() {
						public void end(String body) {
							session.setStatus(body);
						} 
					});
			
			root.getChild("sessionId").setEndTextElementListener(
					new EndTextElementListener() {
						public void end(String body) {
							session.setId(body);
						} 
					});

			Xml.parse(raw_xml, root.getContentHandler());
			
		} catch (Exception e) {
			e.printStackTrace();
		}
    	return session;
    }
}