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package com.example.android.android_me.ui;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import com.example.android.android_me.R;

import java.util.ArrayList;
import java.util.List;

public class BodyPartFragment extends Fragment {

    // Final Strings to store state information about the list of images and list index
    public static final String IMAGE_ID_LIST = "image_ids";
    public static final String LIST_INDEX = "list_index";

    // Tag for logging
    private static final String TAG = "BodyPartFragment";

    // Variables to store a list of image resources and the index of the image that this fragment displays
    private List<Integer> mImageIds;
    private int mListIndex;

    /**
     * Mandatory empty constructor for the fragment manager to instantiate the fragment
     */
    public BodyPartFragment() {
    }

   /**
     * Inflates the fragment layout file and sets the correct resource for the image to display
     */
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        // Load the saved state (the list of images and list index) if there is one
        if(savedInstanceState != null) {
            mImageIds = savedInstanceState.getIntegerArrayList(IMAGE_ID_LIST);
            mListIndex = savedInstanceState.getInt(LIST_INDEX);
        }

        // Inflate the Android-Me fragment layout
        View rootView = inflater.inflate(R.layout.fragment_body_part, container, false);

        // Get a reference to the ImageView in the fragment layout
        final ImageView imageView = (ImageView) rootView.findViewById(R.id.body_part_image_view);

        // If a list of image ids exists, set the image resource to the correct item in that list
        // Otherwise, create a Log statement that indicates that the list was not found
        if(mImageIds != null){
            // Set the image resource to the list item at the stored index
            imageView.setImageResource(mImageIds.get(mListIndex));

            // Set a click listener on the image view
            imageView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    // Increment position as long as the index remains <= the size of the image ids list
                    if(mListIndex < mImageIds.size()-1) {
                        mListIndex++;
                    } else {
                        // The end of list has been reached, so return to beginning index
                        mListIndex = 0;
                    }
                    // Set the image resource to the new list item
                    imageView.setImageResource(mImageIds.get(mListIndex));
                }
            });

        } else {
            Log.v(TAG, "This fragment has a null list of image id's");
        }

        // Return the rootView
        return rootView;
    }

    // Setter methods for keeping track of the list images this fragment can display and which image
    // in the list is currently being displayed

    public void setImageIds(List<Integer> imageIds) {
        mImageIds = imageIds;
    }

    public void setListIndex(int index) {
        mListIndex = index;
    }

    /**
     * Save the current state of this fragment
     */
    @Override
    public void onSaveInstanceState(Bundle currentState) {
        currentState.putIntegerArrayList(IMAGE_ID_LIST, (ArrayList<Integer>) mImageIds);
        currentState.putInt(LIST_INDEX, mListIndex);
    }


}

    public void setListIndex(int index) {
        mListIndex = index;
    }

    /**
     * Save the current state of this fragment
     */
    @Override
    public void onSaveInstanceState(Bundle currentState) {
        currentState.putIntegerArrayList(IMAGE_ID_LIST, (ArrayList<Integer>) mImageIds);
        currentState.putInt(LIST_INDEX, mListIndex);
    }


}

package com.example.android.android_me.ui;

import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import com.example.android.android_me.R;
import com.example.android.android_me.data.AndroidImageAssets;

// This activity will display a custom Android image composed of three body parts: head, body, and legs
public class AndroidMeActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_android_me);

        // Only create new fragments when there is no previously saved state
        if(savedInstanceState == null) {

            // Create a new head BodyPartFragment
            BodyPartFragment headFragment = new BodyPartFragment();

            // Set the list of image id's for the head fragment and set the position to the second image in the list
            headFragment.setImageIds(AndroidImageAssets.getHeads());
            headFragment.setListIndex(1);

            // Add the fragment to its container using a FragmentManager and a Transaction
            FragmentManager fragmentManager = getSupportFragmentManager();

            fragmentManager.beginTransaction()
                    .add(R.id.head_container, headFragment)
                    .commit();

            // Create and display the body and leg BodyPartFragments

            BodyPartFragment bodyFragment = new BodyPartFragment();
            bodyFragment.setImageIds(AndroidImageAssets.getBodies());
            fragmentManager.beginTransaction()
                    .add(R.id.body_container, bodyFragment)
                    .commit();

            BodyPartFragment legFragment = new BodyPartFragment();
            legFragment.setImageIds(AndroidImageAssets.getLegs());
            fragmentManager.beginTransaction()
                    .add(R.id.leg_container, legFragment)
                    .commit();
        }

    }
}