/***
  Copyright (c) 2013 CommonsWare, LLC
  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.
  
  From _The Busy Coder's Guide to Android Development_
    http://commonsware.com/Android
 */

package com.commonsware.android.drawer.simple;

import android.app.Activity;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity implements
    OnItemClickListener {
  private DrawerLayout drawerLayout=null;
  private ActionBarDrawerToggle toggle=null;
  private LoremFragment lorem=null;
  private ContentFragment content=null;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    if (getFragmentManager().findFragmentById(R.id.content) == null) {
      showLorem();
    }

    ListView drawer=(ListView)findViewById(R.id.drawer);

    drawer.setAdapter(new ArrayAdapter<String>(
                                               this,
                                               R.layout.drawer_row,
                                               getResources().getStringArray(R.array.drawer_rows)));
    drawer.setOnItemClickListener(this);

    drawerLayout=(DrawerLayout)findViewById(R.id.drawer_layout);
    toggle=
        new ActionBarDrawerToggle(this, drawerLayout,
                                  R.drawable.ic_drawer,
                                  R.string.drawer_open,
                                  R.string.drawer_close);
    drawerLayout.setDrawerListener(toggle);
    getActionBar().setDisplayHomeAsUpEnabled(true);
    getActionBar().setHomeButtonEnabled(true);
  }

  @Override
  protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);

    toggle.syncState();
  }

  @Override
  public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);

    toggle.onConfigurationChanged(newConfig);
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    if (toggle.onOptionsItemSelected(item)) {
      return(true);
    }

    return(super.onOptionsItemSelected(item));
  }

  @Override
  public void onItemClick(AdapterView<?> listView, View row,
                          int position, long id) {
    if (position == 0) {
      showLorem();
    }
    else {
      showContent();
    }

    drawerLayout.closeDrawers();
  }

  private void showLorem() {
    if (lorem == null) {
      lorem=new LoremFragment();
    }

    if (!lorem.isVisible()) {
      getFragmentManager().beginTransaction()
                          .replace(R.id.content, lorem).commit();
    }
  }

  private void showContent() {
    if (content == null) {
      content=new ContentFragment();
    }

    if (!content.isVisible()) {
      getFragmentManager().beginTransaction()
                          .replace(R.id.content, content).commit();
    }
  }
}
