/* ownCloud Android client application
 *   Copyright (C) 2011  Bartek Przybylski
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package eu.alefzero.owncloud.ui.activity;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.Vector;

import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.preference.CheckBoxPreference;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.PreferenceScreen;
import android.util.Log;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View;
import android.widget.AdapterView.AdapterContextMenuInfo;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockPreferenceActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuInflater;
import com.actionbarsherlock.view.MenuItem;

import eu.alefzero.owncloud.AccountUtils;
import eu.alefzero.owncloud.OwnCloudSession;
import eu.alefzero.owncloud.R;
import eu.alefzero.owncloud.authenticator.AccountAuthenticator;
import eu.alefzero.owncloud.db.DbHandler;

/**
 * An Activity that allows the user to change the application's settings.
 * 
 * @author Bartek Przybylski
 * 
 */
public class Preferences extends SherlockPreferenceActivity implements
		OnPreferenceChangeListener {
	private static final String TAG = "OwnCloudPreferences";
	private final int mNewSession = 47;
	private final int mEditSession = 48;
	private DbHandler mDbHandler;
	private Vector<OwnCloudSession> mSessions;
	private Account[] mAccounts;
	private ListPreference mAccountList;
	private ListPreference mTrackingUpdateInterval;
	private CheckBoxPreference mDeviceTracking;
	private int mSelectedMenuItem;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		mDbHandler = new DbHandler(getBaseContext());
		mSessions = new Vector<OwnCloudSession>();
		addPreferencesFromResource(R.xml.preferences);
		registerForContextMenu(getListView());
		populateAccountList();
		ActionBar actionBar = getSherlock().getActionBar();
		actionBar.setDisplayHomeAsUpEnabled(true);

		// Update summary for device tracking preference
		mTrackingUpdateInterval = (ListPreference) findPreference("devicetracking_update_intervall");
		String trackingSummary = getResources().getString(
				R.string.prefs_trackmydevice_interval_summary);
		trackingSummary = String.format(trackingSummary,
				mTrackingUpdateInterval.getValue());
		mTrackingUpdateInterval.setSummary(trackingSummary);
		mTrackingUpdateInterval.setOnPreferenceChangeListener(this);

		// Enable or disable device tracking service. Listen on events
		mDeviceTracking = (CheckBoxPreference) findPreference("enable_devicetracking");
		mDeviceTracking.setOnPreferenceChangeListener(this);
		
		// populateSessionList();
	}

	private void populateSessionList() {
		mSessions.clear();
		mSessions = mDbHandler.getSessionList();
		PreferenceScreen ps = getPreferenceScreen();
		ps.removeAll();
		addPreferencesFromResource(R.xml.preferences);
		for (int i = 0; i < mSessions.size(); i++) {
			Preference preference = new Preference(getBaseContext());
			preference.setTitle(mSessions.get(i).getName());
			URI uri;
			try {
				uri = new URI(mSessions.get(i).getUrl());
			} catch (URISyntaxException e) {
				e.printStackTrace(); // should never happen
				continue;
			}
			preference.setSummary(uri.getScheme() + "://" + uri.getHost()
					+ uri.getPath());
			ps.addPreference(preference);
		}
	}

	/**
	 * Populates the account selector
	 */
	private void populateAccountList() {
		AccountManager accMan = AccountManager.get(this);
		mAccounts = accMan.getAccountsByType(AccountAuthenticator.ACCOUNT_TYPE);
		mAccountList = (ListPreference) findPreference("select_oc_account");
		mAccountList.setOnPreferenceChangeListener(this);

		// Display the name of the current account if there is any
		Account defaultAccount = AccountUtils.getCurrentOwnCloudAccount(this);
		if (defaultAccount != null) {
			mAccountList.setSummary(defaultAccount.name);
		}

		// Transform accounts into array of string for preferences to use
		String[] accNames = new String[mAccounts.length];
		for (int i = 0; i < mAccounts.length; i++) {
			Account account = mAccounts[i];
			accNames[i] = account.name;
		}

		mAccountList.setEntries(accNames);
		mAccountList.setEntryValues(accNames);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		super.onCreateOptionsMenu(menu);
		MenuInflater inflater = getSherlock().getMenuInflater();
		inflater.inflate(R.menu.prefs_menu, menu);
		return true;
	}

	@Override
	public boolean onMenuItemSelected(int featureId, MenuItem item) {
		super.onMenuItemSelected(featureId, item);
		Intent intent;

		switch (item.getItemId()) {
		case R.id.addSessionItem:
			intent = new Intent(this, PreferencesNewSession.class);
			startActivityForResult(intent, mNewSession);
			break;
		case R.id.SessionContextEdit:
			intent = new Intent(this, PreferencesNewSession.class);
			intent.putExtra("sessionId", mSessions.get(mSelectedMenuItem)
					.getEntryId());
			intent.putExtra("sessionName", mSessions.get(mSelectedMenuItem)
					.getName());
			intent.putExtra("sessionURL", mSessions.get(mSelectedMenuItem)
					.getUrl());
			startActivityForResult(intent, mEditSession);
			break;
		case R.id.SessionContextRemove:
			OwnCloudSession ocs = mSessions.get(mSelectedMenuItem);
			mDbHandler.removeSessionWithId(ocs.getEntryId());
			mSessions.remove(ocs);
			getPreferenceScreen().removePreference(
					getPreferenceScreen().getPreference(mSelectedMenuItem + 1));
			break;
		case android.R.id.home:
			intent = new Intent(getBaseContext(), LandingActivity.class);
			intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
			startActivity(intent);
			break;
		default:
			Log.w(TAG, "Unknown menu item triggered");
			return false;
		}
		return true;
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		if (resultCode == Activity.RESULT_OK) {
			switch (requestCode) {
			case mNewSession:
				mDbHandler.addSession(data.getStringExtra("sessionName"),
						data.getStringExtra("sessionURL"));
				getPreferenceScreen().removeAll();
				addPreferencesFromResource(R.xml.preferences);
				populateSessionList();
				break;
			case mEditSession:
				mDbHandler.changeSessionFields(
						data.getIntExtra("sessionId", -1),
						data.getStringExtra("sessionName"),
						data.getStringExtra("sessionURL"));
				populateSessionList();
				break;
			}
		}
	}

	@Override
	public void onCreateContextMenu(ContextMenu menu, View v,
			ContextMenuInfo menuInfo) {
		super.onCreateContextMenu(menu, v, menuInfo);
		AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo;
		mSelectedMenuItem = info.position - 1;
		menu.setHeaderTitle(mSessions.get(mSelectedMenuItem).getName());

		MenuInflater inflater = getSherlock().getMenuInflater();
		inflater.inflate(R.menu.session_context_menu, (Menu) menu);

	}

	@Override
	protected void onDestroy() {
		mDbHandler.close();
		super.onDestroy();
	}

	@Override
	/**
	 * Updates various summaries after updates. Also starts and stops 
	 * the
	 */
	public boolean onPreferenceChange(Preference preference, Object newValue) {
		// Update current account summary
		if (preference.equals(mAccountList)) {
			mAccountList.setSummary(newValue.toString());
		} 
		
		// Update tracking interval summary
		else if (preference.equals(mTrackingUpdateInterval)) {
			String trackingSummary = getResources().getString(
					R.string.prefs_trackmydevice_interval_summary);
			trackingSummary = String.format(trackingSummary,
					newValue.toString());
			mTrackingUpdateInterval.setSummary(trackingSummary);
		} 
		
		// Start or stop tracking service
		else if (preference.equals(mDeviceTracking)) {
			Intent locationServiceIntent = new Intent();
			locationServiceIntent.setAction("eu.alefzero.owncloud.location.LocationLauncher");
			locationServiceIntent.putExtra("TRACKING_SETTING", (Boolean) newValue);
			sendBroadcast(locationServiceIntent);
		}
		return true;
	}

}