/* 
 * 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;

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

import android.app.ListActivity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import ee.htk.dippler.app.ArrayAdapters.CourseArrayAdapter;
import ee.htk.dippler.app.entities.Course;
import ee.htk.dippler.app.service.Connector;
import ee.htk.dippler.app.service.ListingManager;

public class CoursesActivity extends ListActivity implements OnClickListener {
    private static final int SETTINGS_MENU_ITEM = Menu.FIRST;
    private static final int PREFS_ACTIVITY = 1;
    private Connector service_connector = null;
    private List<Course> courses = new ArrayList<Course>();
    private CourseArrayAdapter mAdapter;
    private ListingManager listingManager;
    private View progress;
    private View load_failed;
    private View reload_btn;
    
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		service_connector = new Connector(getApplicationContext());
		setContentView(R.layout.course_listing);
		progress = findViewById(R.id.progress_wrapper);
		load_failed = findViewById(R.id.load_failed);
		reload_btn = findViewById(R.id.try_again_btn);
		reload_btn.setOnClickListener(this);
		
		//Check if application is configure, if no username or password preference found, launch prefs activity
		SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
		if ( !prefs.contains("dippler-username") && !prefs.contains("dippler-password") ) {
			launchPreferencesActivity();
		} else {
			new ConnectService().execute();
		}

		mAdapter = new CourseArrayAdapter(getApplicationContext(), R.layout.list_course, courses);
		setListAdapter(mAdapter);

		
		getListView().setOnItemClickListener(new OnItemClickListener() {
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				Intent single_course = new Intent(getApplicationContext(), CourseSingleActivity.class);
				single_course.putExtra("dippler-course", courses.get(position) );
				single_course.putExtra("dippler-session", service_connector.getSession());
				startActivity(single_course);
			}
		});
	}

	private class fetchCourses extends AsyncTask<String, Integer, List<Course>> {

		@Override
		protected List<Course> doInBackground(String... params) {
			listingManager = new ListingManager(getApplicationContext(), service_connector.getSessionId());
			List<Course> courses = listingManager.getCourses();
			return courses;
		}

		@Override
		protected void onPostExecute(List<Course> courses_in) {
			super.onPostExecute(courses_in);
			courses.addAll(courses_in);
			mAdapter.notifyDataSetChanged();
			progress.setVisibility(View.GONE);
		}
		
	}
	
	class ConnectService extends AsyncTask<String, Integer, String> {

		@Override
		protected String doInBackground(String... params) {
			return service_connector.connect();
		}

		@Override
		protected void onPostExecute(String result) {
			super.onPostExecute(result);
			Log.i("dippler-app", "Connect result "+result);
			if (result != null) {
				//Finally start fetching
				new fetchCourses().execute();
			} else {
				load_failed.setVisibility(View.VISIBLE);
			}
		}	
	}
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		menu.add(0, SETTINGS_MENU_ITEM, 0, R.string.settings_menu);
		return super.onCreateOptionsMenu(menu);
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch(item.getItemId()) {
		case SETTINGS_MENU_ITEM:
			launchPreferencesActivity();
			return true;
		}
		return super.onOptionsItemSelected(item);
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		if ( requestCode == PREFS_ACTIVITY ) {
			progress.setVisibility(View.VISIBLE);
			courses.clear();
			mAdapter.notifyDataSetChanged();
			new ConnectService().execute();
		}
	}
	
	private void launchPreferencesActivity() {
		Intent settings_intent = new Intent(this, PreferencesActivity.class);
		startActivityForResult(settings_intent, PREFS_ACTIVITY);
	}

	@Override
	public void onClick(View v) {
		if ( v.getId() == R.id.try_again_btn ) {
			load_failed.setVisibility(View.GONE);
			progress.setVisibility(View.VISIBLE);
			new ConnectService().execute();
		}
	}
}