GitNex-Android-App/app/src/main/java/org/mian/gitnex/viewmodels/WikiViewModel.java

package org.mian.gitnex.viewmodels;

import android.content.Context;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;
import org.gitnex.tea4j.v2.models.WikiPageMetaData;
import org.json.JSONException;
import org.json.JSONObject;
import org.mian.gitnex.R;
import org.mian.gitnex.adapters.WikiListAdapter;
import org.mian.gitnex.clients.RetrofitClient;
import org.mian.gitnex.databinding.FragmentWikiBinding;
import org.mian.gitnex.helpers.Toasty;
import java.io.IOException;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

/**
 * @author M M Arif
 */

public class WikiViewModel extends ViewModel {

	private MutableLiveData<List<WikiPageMetaData>> wikiList;

	public LiveData<List<WikiPageMetaData>> getWiki(String owner, String repo, int page, int resultLimit, Context ctx, FragmentWikiBinding fragmentWikiBinding) {

		wikiList = new MutableLiveData<>();
		loadWikiList(owner, repo, page, resultLimit, ctx, fragmentWikiBinding);

		return wikiList;
	}

	public void loadWikiList(String owner, String repo, int page, int resultLimit, Context ctx, FragmentWikiBinding fragmentWikiBinding) {

		Call<List<WikiPageMetaData>> call;
		call = RetrofitClient.getApiInterface(ctx).repoGetWikiPages(owner, repo, page, resultLimit);

		call.enqueue(new Callback<>() {

			@Override
			public void onResponse(@NonNull Call<List<WikiPageMetaData>> call, @NonNull Response<List<WikiPageMetaData>> response) {

				if(response.isSuccessful()) {
					if(response.code() == 200) {
						wikiList.postValue(response.body());
					}
				}
				else if(response.code() == 404) {
					fragmentWikiBinding.progressBar.setVisibility(View.GONE);
					fragmentWikiBinding.noData.setVisibility(View.VISIBLE);
					fragmentWikiBinding.recyclerView.setVisibility(View.GONE);
				}
				else {
					Toasty.error(ctx, ctx.getString(R.string.genericError));
				}

				try {
					if(response.errorBody() != null) {
						new JSONObject(response.errorBody().string());
					}
				}
				catch(IOException | JSONException e) {
					fragmentWikiBinding.noData.setText(ctx.getResources().getString(R.string.apiNotFound));
				}
			}

			@Override
			public void onFailure(@NonNull Call<List<WikiPageMetaData>> call, @NonNull Throwable t) {

				Toasty.error(ctx, ctx.getString(R.string.genericServerResponseError));
			}
		});
	}

	public void loadMoreWiki(String owner, String repo, int page, int resultLimit, Context ctx, FragmentWikiBinding fragmentWikiBinding, WikiListAdapter adapter) {

		Call<List<WikiPageMetaData>> call;
		call = RetrofitClient.getApiInterface(ctx).repoGetWikiPages(owner, repo, page, resultLimit);

		call.enqueue(new Callback<>() {

			@Override
			public void onResponse(@NonNull Call<List<WikiPageMetaData>> call, @NonNull Response<List<WikiPageMetaData>> response) {

				if(response.isSuccessful()) {
					List<WikiPageMetaData> list = wikiList.getValue();
					assert list != null;
					assert response.body() != null;

					if(response.body().size() != 0) {
						list.addAll(response.body());
						adapter.updateList(list);
					}
					else {
						adapter.setMoreDataAvailable(false);
					}
				}
				else {
					Toasty.error(ctx, ctx.getString(R.string.genericError));
				}
			}

			@Override
			public void onFailure(@NonNull Call<List<WikiPageMetaData>> call, @NonNull Throwable t) {

				Toasty.error(ctx, ctx.getString(R.string.genericServerResponseError));
			}
		});
	}

}