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import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.Toast;

/**
 * Fragment for adding extra custom action bar icons to an activity (nothing is displayed for this fragment).
 *
 * Remember this is a UIless fragment, it is attached via a tag to the activity not to content :s
 *
 */
public class AnimActionFragment extends Fragment {

    public static final String TAG = AnimActionFragment.class.getSimpleName();
    
    private LayoutInflater mInflater;
    private Menu mMenu;

    public static AnimActionFragment newInstance(String param1, String param2) {
        AnimActionFragment fragment = new AnimActionFragment();
        return fragment;
    }
    
    public AnimActionFragment() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
        mInflater = LayoutInflater.from(getActivity());
    }

    @Override
    public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) {
        inflater.inflate(R.menu.action_anim, menu);
        mMenu = menu;
        // set default icon if passed in - not used at the mo
        /*if (mCurrentDrawableId != 0) {
            changeActionBarIcon(getActivity(), menu.findItem(R.id.action_bar_button_show), mCurrentDrawableId, false, 0);
        }*/
        super.onCreateOptionsMenu(menu, inflater);
    }

    @Override
    public boolean onOptionsItemSelected(final MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_bar_button_android:
                Toast.makeText(getActivity(), "android action button tapped!", 3000).show();
                animate();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    private void animate() {
        changeActionBarIcon(getActivity(), mMenu.findItem(R.id.action_bar_button_android), -1, true, R.anim.pull_down);
    }

    /**
     * method to change the an action bar button icon
     *
     * @param context
     * @param actionBarButtonToChange
     * @param newDrawableResId
     * @param animate
     * @param animResId
     */
    public void changeActionBarIcon(final Context context, final MenuItem actionBarButtonToChange, final int newDrawableResId, final boolean animate,
                                    final int animResId) {

        final Drawable newActionBarButtonDrawable;
        if (newDrawableResId > 0) {
            newActionBarButtonDrawable = getResources().getDrawable(newDrawableResId);
        } else {
            newActionBarButtonDrawable = actionBarButtonToChange.getIcon();
        }

        if (animate && animResId != 0) {
            final ImageView iv = (ImageView) mInflater.inflate(R.layout.element_custom_action_view, null);
            iv.setImageDrawable(newActionBarButtonDrawable);

            iv.clearAnimation();

            Animation anim = AnimationUtils.loadAnimation(getActivity(), animResId);
            anim.setAnimationListener(new Animation.AnimationListener() {
                @Override
                public void onAnimationStart(final Animation animation) {
                }

                @Override
                public void onAnimationRepeat(final Animation animation) {
                }

                @Override
                public void onAnimationEnd(final Animation animation) {
                    // iv.clearAnimation();
                    // added addition null checks, encase this is repeatedly run
                    if (actionBarButtonToChange != null) {
                        View actionView = actionBarButtonToChange.getActionView();
                        if (actionView != null) {
                            actionView.clearAnimation();
                        }
                        actionBarButtonToChange.setActionView(null);
                        actionBarButtonToChange.setIcon(newActionBarButtonDrawable);
                    }
                }
            });
            iv.startAnimation(anim);
            actionBarButtonToChange.setActionView(iv);
        } else {
            if (newActionBarButtonDrawable != null) {
                actionBarButtonToChange.setIcon(newActionBarButtonDrawable);
            }
        }

    }
}