Up Coming Fragment

package com.example.nurrohim.moviedicoding.fragment;


import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.example.nurrohim.moviedicoding.R;
import com.example.nurrohim.moviedicoding.adapter.MoviesAdapter;
import com.example.nurrohim.moviedicoding.model.search.ResultsItem;
import com.example.nurrohim.moviedicoding.model.upcoming.UpcomingModel;
import com.example.nurrohim.moviedicoding.service.APIClient;
import com.example.nurrohim.moviedicoding.utils.Language;

import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.Unbinder;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

/**
 * A simple {@link Fragment} subclass.
 */
public class UpComingFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener{


    private Context context;
    @BindView(R.id.rv_upcoming)
    RecyclerView rvUpcoming;
    @BindView(R.id.swipe_refresh)
    SwipeRefreshLayout swipe_refresh;
    private Unbinder unbinder;

    private MoviesAdapter adapter;

    private Call<UpcomingModel> apiCall;
    private APIClient apiClient = new APIClient();
    private UpcomingModel upcomingModel;

    ArrayList<ResultsItem> resultsItems = new ArrayList<>();

    private int currentPage = 1;
    private int totalPages = 1;


    public UpComingFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view= inflater.inflate(R.layout.fragment_up_coming, container, false);
        context=view.getContext();
        unbinder = ButterKnife.bind(this, view);
        swipe_refresh.setOnRefreshListener(this);
        setuplist();
        setupListScrollListener();
        loadData();

        if (savedInstanceState != null){
            resultsItems = savedInstanceState.getParcelableArrayList("listfilm");
        }
        return view;
    }
    private void loadData() {
        apiCall = apiClient.getService().getUpcomingModel(Language.getCountry(),currentPage);

        apiCall.enqueue(new Callback<UpcomingModel>() {
            @Override
            public void onResponse(Call<UpcomingModel> call, Response<UpcomingModel> response) {
                if (response.isSuccessful()) {
                    totalPages = response.body().getTotalPages();
                    //List<ResultsItem> items = response.body().getResults();
                    List<ResultsItem> items= response.body().getResults();
                    showResults(response.body().getTotalResults());

                    if (currentPage > 1) adapter.updateData(items);
                    else adapter.replaceAll(items);
                    stopRefrehing();
                } else loadFailed();
            }

            @Override
            public void onFailure(Call<UpcomingModel> call, Throwable t) {
                stopRefrehing();
                loadFailed();
            }
        });
    }
    @Override
    public void onSaveInstanceState(Bundle outState) {

        super.onSaveInstanceState(outState);
    }
    private void setuplist() {
        adapter = new MoviesAdapter();
        rvUpcoming.setLayoutManager(new LinearLayoutManager(context));
        rvUpcoming.setAdapter(adapter);
    }
    private void setupListScrollListener() {
        rvUpcoming.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);

                LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();

                int totalItems = layoutManager.getItemCount();
                int visibleItems = layoutManager.getChildCount();
                int pastVisibleItems = layoutManager.findFirstCompletelyVisibleItemPosition();

                if (pastVisibleItems + visibleItems >= totalItems) {
                    if (currentPage < totalPages) currentPage++;
                    startRefreshing();
                }
            }
        });
    }
    private void loadFailed() {
        Toast.makeText(context, R.string.error_mas,Toast.LENGTH_SHORT).show();
    }

    private void showResults(int totalResults) {
        String formatResults = NumberFormat.getIntegerInstance().format(totalResults);
    }

    @Override
    public void onRefresh() {
        currentPage = 1;
        totalPages = 1;

        stopRefrehing();
        startRefreshing();
    }
    private void startRefreshing() {
        if (swipe_refresh.isRefreshing()) return;
        swipe_refresh.setRefreshing(true);

        loadData();
    }

    private void stopRefrehing() {
        if (swipe_refresh.isRefreshing()) swipe_refresh.setRefreshing(false);
    }
    public void setData(UpcomingModel data) {
        this.upcomingModel = data;
    }

    public UpcomingModel getData() {
        return upcomingModel;
    }

}