/* 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;
    }

}