/* 
 * 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.Element;
import android.sax.EndTextElementListener;
import android.sax.RootElement;
import android.util.Log;
import android.util.Xml;
import ee.htk.dippler.app.entities.Course;

public class CourseManager {
	
	private static final String SOAP_ACTION = "http://backoffice.dippler.htk.tlu.ee/courseManager";
    private static final String METHOD_NAME = "courseManager";
    private static final String NAMESPACE = "http://backoffice.dippler.htk.tlu.ee/";

    private Context app_context;
	private ProfileManager profileManager;
	
    public CourseManager(Context context) {
		this.app_context = context;
		this.profileManager = new ProfileManager(context);
	}
	
	private Context getLocalContext() {
		return this.app_context;
	}
	
	public Course loadMetaData(String sessionId, Course course) {
		SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getLocalContext());
    	
        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);  
        request.addProperty("sessId", sessionId);
        request.addProperty("action", "LOAD");
        request.addProperty("data", buildDataXML(course));
        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"));
        Log.i("dippler-app", "Starting");
        try {
        	ht.call(SOAP_ACTION, envelope);
            SoapPrimitive response = (SoapPrimitive) envelope.getResponse();
            Log.i("dippler-app", "Course xml " + response.toString());
            course = getTitle(response.toString(), course);
            course.setFacilitator(profileManager.loadProfile(sessionId, course.getOwner_id()));
            return course;
        } catch (Exception e) {
        	Log.i("dippler-app", "Failed: "+e.getLocalizedMessage());
            e.printStackTrace();
        }
		return null;
	}
	
	private String buildDataXML(Course course) {
		StringBuffer xml = new StringBuffer("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>");
		xml.append("<course id=\""+course.getId()+"\">");
        xml.append("<id>"+course.getId()+"</id>");
		xml.append("</course>");	
        return xml.toString();
	}
	
	public Course getTitle(String raw_xml, final Course course) {
    	try {		
			final RootElement root = new RootElement("response"); 
			final Element data = root.getChild("data").getChild("course");
			data.getChild("title").setEndTextElementListener(
					new EndTextElementListener() {
						public void end(String body) {
							course.setTitle(body);
						} 
					});
			data.getChild("start").setEndTextElementListener(
					new EndTextElementListener() {
						public void end(String body) {
							course.setStart_date(body);
						} 
					});
			
			data.getChild("owner").setEndTextElementListener(
					new EndTextElementListener() {
						public void end(String body) {
							course.setOwner_id(body);
						} 
					});
			
			data.getChild("end").setEndTextElementListener(
					new EndTextElementListener() {
						public void end(String body) {
							course.setEnd_date(body);
						} 
					});

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