package de.pointedears.converter;

/*
 * Copyright (C) 2007 The Android Open Source Project
 * 
 * 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.
 */

import java.text.Collator;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.ListActivity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;

/**
 * Generates the main menu as a list of activities from the manifest
 * 
 * @author
 *         Thomas 'PointedEars' Lahn;
 *         Class courtesy of The Android Open Source Project
 *         (Android 2.2 SDK Examples), slightly adapted
 */
public class MenuActivity extends ListActivity
{
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);

    Intent intent = this.getIntent();
    String path = intent.getStringExtra("de.pointedears.converter.Path"); //$NON-NLS-1$

    if (path == null)
    {
      path = ""; //$NON-NLS-1$
    }

    this.setListAdapter(new SimpleAdapter(this, this.getData(path),
                android.R.layout.simple_list_item_1, new String[] { "title" }, //$NON-NLS-1$
      new int[] { android.R.id.text1 }));
    this.getListView().setTextFilterEnabled(true);
  }

  /**
   * @param prefix
   * @return
   */
  protected List getData(String prefix)
  {
    List<Map> myData = new ArrayList<Map>();

    Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
    mainIntent.addCategory(ConverterApplication.CATEGORY_CONVERTER);

    PackageManager pm = this.getPackageManager();
    List<ResolveInfo> list = pm.queryIntentActivities(mainIntent, 0);

    if (null == list)
    {
      return myData;
    }

    String[] prefixPath;

    if (prefix.equals("")) //$NON-NLS-1$
    {
      prefixPath = null;
    }
    else
    {
      prefixPath = prefix.split("/"); //$NON-NLS-1$
    }

    int len = list.size();

    Map<String, Boolean> entries = new HashMap<String, Boolean>();

    for (int i = 0; i < len; i++)
    {
      ResolveInfo info = list.get(i);
      CharSequence labelSeq = info.loadLabel(pm);
      String label = labelSeq != null
                    ? labelSeq.toString()
                    : info.activityInfo.name;

      if (prefix.length() == 0 || label.startsWith(prefix))
      {

        String[] labelPath = label.split("/"); //$NON-NLS-1$

        String nextLabel =
          prefixPath == null ? labelPath[0] : labelPath[prefixPath.length];

        if ((prefixPath != null ? prefixPath.length : 0) == labelPath.length - 1)
        {
          this.addItem(myData, nextLabel, this.activityIntent(
                            info.activityInfo.applicationInfo.packageName,
                            info.activityInfo.name));
        }
        else
        {
          if (entries.get(nextLabel) == null)
          {
            this.addItem(
              myData,
              nextLabel,
              this.browseIntent(prefix.equals("") ? nextLabel : prefix + "/" //$NON-NLS-1$//$NON-NLS-2$
                + nextLabel));
            entries.put(nextLabel, true);
          }
        }
      }
    }

    Collections.sort(myData, MenuActivity.sDisplayNameComparator);

    return myData;
  }

  private final static Comparator<Map> sDisplayNameComparator =
    new Comparator<Map>() {
      private final Collator collator = Collator.getInstance();

      public int compare(Map map1, Map map2)
      {
        return this.collator.compare(map1.get("title"), map2.get("title")); //$NON-NLS-1$ //$NON-NLS-2$
      }
    };

  /**
   * @param pkg
   * @param componentName
   * @return
   */
  protected Intent activityIntent(String pkg, String componentName)
  {
    Intent result = new Intent();
    result.setClassName(pkg, componentName);
    return result;
  }

  /**
   * @param path
   * @return
   */
  protected Intent browseIntent(String path)
  {
    Intent result = new Intent();
    result.setClass(this, MenuActivity.class);
    result.putExtra("de.pointedears.converter.Path", path); //$NON-NLS-1$
    return result;
  }

  /**
   * @param data
   * @param name
   * @param intent
   */
  protected void addItem(List<Map> data, String name, Intent intent)
  {
    Map<String, Object> temp = new HashMap<String, Object>();
    temp.put("title", name); //$NON-NLS-1$
    temp.put("intent", intent); //$NON-NLS-1$
    data.add(temp);
  }

  /*
   * (non-Javadoc)
   * 
   * @see android.app.ListActivity#onListItemClick(android.widget.ListView,
   * android.view.View, int, long)
   */
  @Override
  protected void onListItemClick(ListView l, View v, int position, long id)
  {
    Map map = (Map) l.getItemAtPosition(position);

    Intent intent = (Intent) map.get("intent"); //$NON-NLS-1$
    this.startActivity(intent);
  }

}