/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.setupwizardlib.template;

import static org.mockito.Matchers.anyInt;
import static org.mockito.Matchers.eq;
import static org.mockito.Mockito.doNothing;
import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.verify;
import static org.robolectric.RuntimeEnvironment.application;

import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.RecyclerView.OnScrollListener;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.ArgumentCaptor;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.annotation.Config;

@Config(sdk = {Config.OLDEST_SDK, Config.NEWEST_SDK})
@RunWith(RobolectricTestRunner.class)
public class RecyclerViewScrollHandlingDelegateTest {

  @Mock private RequireScrollMixin mRequireScrollMixin;

  private RecyclerView mRecyclerView;
  private RecyclerViewScrollHandlingDelegate mDelegate;
  private ArgumentCaptor<OnScrollListener> mListenerCaptor;

  @Before
  public void setUp() throws Exception {
    MockitoAnnotations.initMocks(this);

    mRecyclerView = spy(new RecyclerView(application));
    doReturn(20).when(mRecyclerView).computeVerticalScrollRange();
    doReturn(0).when(mRecyclerView).computeVerticalScrollExtent();
    doReturn(0).when(mRecyclerView).computeVerticalScrollOffset();
    mListenerCaptor = ArgumentCaptor.forClass(OnScrollListener.class);
    doNothing().when(mRecyclerView).addOnScrollListener(mListenerCaptor.capture());

    mDelegate = new RecyclerViewScrollHandlingDelegate(mRequireScrollMixin, mRecyclerView);
    mRecyclerView.layout(0, 0, 50, 50);
  }

  @Test
  public void testRequireScroll() {
    mDelegate.startListening();
    verify(mRequireScrollMixin).notifyScrollabilityChange(true);
  }

  @Test
  public void testScrolledToBottom() {
    mDelegate.startListening();
    verify(mRequireScrollMixin).notifyScrollabilityChange(true);

    doReturn(20).when(mRecyclerView).computeVerticalScrollOffset();
    mListenerCaptor.getValue().onScrolled(mRecyclerView, 0, 20);

    verify(mRequireScrollMixin).notifyScrollabilityChange(false);
  }

  @Test
  public void testClickScrollButton() {
    mDelegate.pageScrollDown();
    verify(mRecyclerView).smoothScrollBy(anyInt(), eq(50));
  }
}
