package course.labs.fragmentslab;

import android.app.Activity;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends Activity implements
FriendsFragment.SelectionListener {

    private static final String TAG = "Lab-Fragments";

    private FriendsFragment mFriendsFragment;
    private FeedFragment mFeedFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);
        // If the layout is single-pane, create the FriendsFragment
        // and add it to the Activity
        if (!isInTwoPaneMode()) {
            mFriendsFragment = new FriendsFragment();
            FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
            fragmentTransaction.add(R.id.fragment_container, mFriendsFragment);
            fragmentTransaction.commit();
        } else {
            // Otherwise, save a reference to the FeedFragment for later use
            mFeedFragment = (FeedFragment) getFragmentManager().findFragmentById(R.id.feed_frag);
        }
    }

    // If there is no fragment_container ID, then the application is in
    // two-pane mode
    private boolean isInTwoPaneMode() {
        return findViewById(R.id.fragment_container) == null;
    }

    // Display selected Twitter feed
    public void onItemSelected(int position) {
        Log.i(TAG, "Entered onItemSelected(" + position + ")");
        // If there is no FeedFragment instance, then create one
        if (mFeedFragment == null)
            mFeedFragment = new FeedFragment();
        // If in single-pane mode, replace single visible Fragment
        if (!isInTwoPaneMode()) {
            FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
            fragmentTransaction.replace(R.id.fragment_container, mFeedFragment);
            fragmentTransaction.addToBackStack(null);
            fragmentTransaction.commit();
            getFragmentManager().executePendingTransactions();
        }
        // Update Twitter feed display on FriendFragment
        mFeedFragment.updateFeedDisplay(position);
    }
}