/*
 * Copyright (C) 2016 Google Inc.
 *
 * 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 com.googlecode.android_scripting.activity;

import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.database.DataSetObserver;
import android.os.Bundle;
import android.os.Parcelable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;

import com.googlecode.android_scripting.BaseApplication;
import com.googlecode.android_scripting.FeaturedInterpreters;
import com.googlecode.android_scripting.IntentBuilders;
import com.googlecode.android_scripting.R;
import com.googlecode.android_scripting.interpreter.Interpreter;
import com.googlecode.android_scripting.interpreter.InterpreterConfiguration;
import com.googlecode.android_scripting.interpreter.InterpreterConfiguration.ConfigurationObserver;

import java.util.List;

/**
 * Presents available scripts and returns the selected one.
 *
 * @author Damon Kohler (damonkohler@gmail.com)
 */
public class InterpreterPicker extends ListActivity {

  private List<Interpreter> mInterpreters;
  private InterpreterPickerAdapter mAdapter;
  private InterpreterConfiguration mConfiguration;
  private ScriptListObserver mObserver;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    CustomizeWindow.requestCustomTitle(this, "Interpreters", R.layout.script_manager);
    mObserver = new ScriptListObserver();
    mConfiguration = ((BaseApplication) getApplication()).getInterpreterConfiguration();
    mInterpreters = mConfiguration.getInteractiveInterpreters();
    mConfiguration.registerObserver(mObserver);
    mAdapter = new InterpreterPickerAdapter();
    mAdapter.registerDataSetObserver(mObserver);
    setListAdapter(mAdapter);
  }

  @Override
  protected void onListItemClick(ListView list, View view, int position, long id) {
    final Interpreter interpreter = (Interpreter) list.getItemAtPosition(position);
    if (Intent.ACTION_CREATE_SHORTCUT.equals(getIntent().getAction())) {
      int icon =
          FeaturedInterpreters.getInterpreterIcon(InterpreterPicker.this, interpreter
              .getExtension());
      if (icon == 0) {
        icon = R.drawable.sl4a_logo_48;
      }
      Parcelable iconResource =
          Intent.ShortcutIconResource.fromContext(InterpreterPicker.this, icon);
      Intent intent = IntentBuilders.buildInterpreterShortcutIntent(interpreter, iconResource);
      setResult(RESULT_OK, intent);
    }
    finish();
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    mConfiguration.unregisterObserver(mObserver);
  }

  private class ScriptListObserver extends DataSetObserver implements ConfigurationObserver {
    @Override
    public void onInvalidated() {
      mInterpreters = mConfiguration.getInteractiveInterpreters();
    }

    @Override
    public void onConfigurationChanged() {
      mAdapter.notifyDataSetInvalidated();
    }
  }

  private class InterpreterPickerAdapter extends BaseAdapter {

    @Override
    public int getCount() {
      return mInterpreters.size();
    }

    @Override
    public Object getItem(int position) {
      return mInterpreters.get(position);
    }

    @Override
    public long getItemId(int position) {
      return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
      LinearLayout container;

      Interpreter interpreter = mInterpreters.get(position);

      if (convertView == null) {
        LayoutInflater inflater =
            (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        container = (LinearLayout) inflater.inflate(R.layout.list_item, null);
      } else {
        container = (LinearLayout) convertView;
      }
      ImageView img = (ImageView) container.findViewById(R.id.list_item_icon);

      int imgId =
          FeaturedInterpreters.getInterpreterIcon(InterpreterPicker.this, interpreter
              .getExtension());
      if (imgId == 0) {
        imgId = R.drawable.sl4a_logo_32;
      }

      img.setImageResource(imgId);

      TextView text = (TextView) container.findViewById(R.id.list_item_title);

      text.setText(interpreter.getNiceName());
      return container;
    }
  }
}