package uk.co.blatech.blaupload;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.Toast;

import com.squareup.otto.Subscribe;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

import uk.co.blatech.blaupload.data.ImageItem;
import uk.co.blatech.blaupload.ui.GridViewAdapter;
import uk.co.blatech.blaupload.util.BlaImageLoader;
import uk.co.blatech.blaupload.util.EventBus;
import uk.co.blatech.blaupload.util.ImageLoaderResultEvent;
import uk.co.blatech.blaupload.util.JSONLoader;
import uk.co.blatech.blaupload.util.JSONLoaderResultEvent;


/**
 * A simple {@link Fragment} subclass.
 * This is the main part of the home screen.
 * Currently it displays the 9 most recent files from blaupload in a grid
 *
 */
public  class HomeScreenFragment extends Fragment {

    private OnFragmentInteractionListener mListener;
    private ArrayList<ImageItem> thumbnails;
    private GridViewAdapter gridAdapter;
    private GridView gridView;
    private ArrayList<String> filenames;
    private JSONArray json;
    /**
     * Returns a new instance of this fragment
     */
    public static HomeScreenFragment newInstance() {
        HomeScreenFragment fragment = new HomeScreenFragment();
        Bundle args = new Bundle();
        fragment.setArguments(args);
        return fragment;
    }

    public HomeScreenFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_home_screen, container, false);
        EventBus.getInstance().register(this);
        gridView = (GridView) rootView.findViewById(R.id.gridView);

        return rootView;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        thumbnails = new ArrayList<ImageItem>();
        gridAdapter =
                new GridViewAdapter(getActivity(), R.layout.grid_item, thumbnails);
        gridView.setAdapter(gridAdapter);

        filenames = new ArrayList<String>();
        //Open the full image in a pager when clicked
        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v,
                                    int position, long id) {

            Toast.makeText(getActivity(), "Clicked image #"+position, Toast.LENGTH_SHORT).show();
            Intent mIntent = new Intent(getActivity(), ImagePager.class);
            mIntent.putExtra("json", json.toString());
            mIntent.putExtra("position", position);
            startActivity(mIntent);

            }

        });
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        //Start loading the JSON file list in a thread as soon as we start
        new JSONLoader().execute("http://www.blaupload.co.uk/?format=json&last=6");

    }


    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }


    /**
     * This interface must be implemented by activities that contain this
     * fragment to allow an interaction in this fragment to be communicated
     * to the activity and potentially other fragments contained in that
     * activity.
     * <p>
     * See the Android Training lesson <a href=
     * "http://developer.android.com/training/basics/fragments/communicating.html"
     * >Communicating with Other Fragments</a> for more information.
     */
    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        public void onFragmentInteraction(Uri uri);
    }

    /**
     * This function is called when the JSONLoader thread finishes
     * It processes the JSON and then starts loading the image thumbnails
     * @param event Event containing the JSONArray of files
     */
    @Subscribe
    public void onAsyncTaskResult(JSONLoaderResultEvent event) {

        json = event.getResult();

        if (json != null) {

            try {
                // Get the filename out of each JSON item
                for (int i = 0; i < json.length(); i++) {
                    JSONObject item = json.getJSONObject(i);
                    filenames.add(item.getString("filename"));

                }
            } catch (JSONException e) {
                //TODO: Error handling
                e.printStackTrace();
            }


            //Load the thumbnail for each item on a thread
            int id = 0;
            for (String filename : filenames) {
                new BlaImageLoader(getResources()).execute("http://www.lc8n.com/bla100/", filename, String.valueOf(id));
                id++;
            }


        }
    }

    /**
     * This function is called when an ImageLoader thread finishes
     * It puts the image into the grid
     * @param event Event containing an ImageItem with a bitmap and image details
     */
    @Subscribe
    public void onAsyncTaskResult(ImageLoaderResultEvent event) {

        ImageItem image = event.getResult();
        thumbnails.add(image.getId(), image);
        gridAdapter.notifyDataSetChanged();

    }

}