/***
  Copyright (c) 2012 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.mvp2;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class MainActivity extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ViewPager pager=(ViewPager)findViewById(R.id.pager);

    pager.setAdapter(new SampleAdapter());
  }

  /*
   * Inspired by
   * https://gist.github.com/8cbe094bb7a783e37ad1
   */
  private class SampleAdapter extends PagerAdapter {
    @Override
    public Object instantiateItem(ViewGroup container, int position) {
      View page=
          getLayoutInflater().inflate(R.layout.page, container, false);
      TextView tv=(TextView)page.findViewById(R.id.text);

      position=position * 2;

      populateTextView(tv, position);
      position++;
      tv=(TextView)page.findViewById(R.id.text2);

      if (position < getRealCount()) {
        populateTextView(tv, position);
        tv.setVisibility(View.VISIBLE);
      }
      else {
        tv.setVisibility(View.INVISIBLE);
      }

      container.addView(page);

      return(page);
    }

    @Override
    public void destroyItem(ViewGroup container, int position,
                            Object object) {
      container.removeView((View)object);
    }

    @Override
    public int getCount() {
      return((getRealCount() / 2) + 1);
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
      return(view == object);
    }

    private int getRealCount() {
      return(9);
    }

    private void populateTextView(TextView tv, int position) {
      int blue=position * 25;

      tv.setText(String.format(getString(R.string.item), position + 1));
      tv.setBackgroundColor(Color.argb(255, 0, 0, blue));
    }
  }
}
