GitNex/app/src/main/java/org/mian/gitnex/fragments/MyProfileFollowingFragment.java

package org.mian.gitnex.fragments;

import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import java.util.ArrayList;
import java.util.List;
import org.gitnex.tea4j.v2.models.User;
import org.mian.gitnex.R;
import org.mian.gitnex.adapters.UsersAdapter;
import org.mian.gitnex.clients.RetrofitClient;
import org.mian.gitnex.databinding.FragmentProfileFollowersFollowingBinding;
import org.mian.gitnex.helpers.Constants;
import org.mian.gitnex.helpers.SnackBar;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

/**
 * @author M M Arif
 */
public class MyProfileFollowingFragment extends Fragment {

	private final String TAG = "MyProfileFollowingFragment";
	private FragmentProfileFollowersFollowingBinding viewBinding;
	private Context context;
	private List<User> dataList;
	private UsersAdapter adapter;
	private int pageSize;
	private int resultLimit;

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

		viewBinding = FragmentProfileFollowersFollowingBinding.inflate(inflater, container, false);
		context = getContext();

		dataList = new ArrayList<>();
		adapter = new UsersAdapter(dataList, context);
		resultLimit = Constants.getCurrentResultLimit(context);

		viewBinding.pullToRefresh.setOnRefreshListener(
				() ->
						new Handler(Looper.getMainLooper())
								.postDelayed(
										() -> {
											viewBinding.pullToRefresh.setRefreshing(false);
											loadInitial(resultLimit);
											adapter.notifyDataChanged();
										},
										200));

		adapter.setLoadMoreListener(
				() ->
						viewBinding.recyclerView.post(
								() -> {
									if (dataList.size() == resultLimit || pageSize == resultLimit) {
										int page = (dataList.size() + resultLimit) / resultLimit;
										loadMore(resultLimit, page);
									}
								}));

		viewBinding.recyclerView.setHasFixedSize(true);
		viewBinding.recyclerView.setLayoutManager(new LinearLayoutManager(context));
		viewBinding.recyclerView.setAdapter(adapter);

		loadInitial(resultLimit);

		return viewBinding.getRoot();
	}

	private void loadInitial(int resultLimit) {

		Call<List<User>> call =
				RetrofitClient.getApiInterface(context).userCurrentListFollowing(1, resultLimit);
		call.enqueue(
				new Callback<List<User>>() {

					@Override
					public void onResponse(
							@NonNull Call<List<User>> call,
							@NonNull Response<List<User>> response) {
						if (response.isSuccessful()) {
							if (response.body() != null && response.body().size() > 0) {
								dataList.clear();
								dataList.addAll(response.body());
								adapter.notifyDataChanged();
								viewBinding.noData.setVisibility(View.GONE);
							} else {
								dataList.clear();
								adapter.notifyDataChanged();
								viewBinding.noData.setVisibility(View.VISIBLE);
							}
							viewBinding.progressBar.setVisibility(View.GONE);
						} else if (response.code() == 404) {
							viewBinding.noData.setVisibility(View.VISIBLE);
							viewBinding.progressBar.setVisibility(View.GONE);
						} else {
							Log.e(TAG, String.valueOf(response.code()));
						}
					}

					@Override
					public void onFailure(@NonNull Call<List<User>> call, @NonNull Throwable t) {
						Log.e(TAG, t.toString());
					}
				});
	}

	private void loadMore(int resultLimit, int page) {

		viewBinding.progressBar.setVisibility(View.VISIBLE);
		Call<List<User>> call =
				RetrofitClient.getApiInterface(context).userCurrentListFollowing(page, resultLimit);
		call.enqueue(
				new Callback<List<User>>() {

					@Override
					public void onResponse(
							@NonNull Call<List<User>> call,
							@NonNull Response<List<User>> response) {
						if (response.isSuccessful()) {
							assert response.body() != null;
							List<User> result = response.body();
							if (result.size() > 0) {
								pageSize = result.size();
								dataList.addAll(result);
							} else {
								SnackBar.info(
										context,
										viewBinding.getRoot(),
										getString(R.string.noMoreData));
								adapter.setMoreDataAvailable(false);
							}
							adapter.notifyDataChanged();
							viewBinding.progressBar.setVisibility(View.GONE);
						} else {
							Log.e(TAG, String.valueOf(response.code()));
						}
					}

					@Override
					public void onFailure(@NonNull Call<List<User>> call, @NonNull Throwable t) {
						Log.e(TAG, t.toString());
					}
				});
	}
}