// Copyright 2018 The Feed Authors.
//
// 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.google.android.libraries.feed.basicstream.internal.drivers;

import static com.google.android.libraries.feed.common.testing.RunnableSubject.assertThatRunnable;
import static com.google.common.truth.Truth.assertThat;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyBoolean;
import static org.mockito.ArgumentMatchers.anyInt;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.reset;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.mockito.Mockito.when;
import static org.mockito.MockitoAnnotations.initMocks;

import android.app.Activity;
import android.content.Context;
import android.view.View.OnClickListener;
import android.widget.FrameLayout;
import com.google.android.libraries.feed.api.client.stream.Stream.ContentChangedListener;
import com.google.android.libraries.feed.api.host.logging.BasicLoggingApi;
import com.google.android.libraries.feed.api.host.logging.RequestReason;
import com.google.android.libraries.feed.api.host.logging.SpinnerType;
import com.google.android.libraries.feed.api.internal.modelprovider.ModelProvider;
import com.google.android.libraries.feed.basicstream.internal.viewholders.ZeroStateViewHolder;
import com.google.android.libraries.feed.common.time.Clock;
import com.google.android.libraries.feed.common.time.testing.FakeClock;
import com.google.android.libraries.feed.sharedstream.logging.SpinnerLogger;
import com.google.android.libraries.feed.sharedstream.proto.UiRefreshReasonProto.UiRefreshReason;
import com.google.android.libraries.feed.sharedstream.proto.UiRefreshReasonProto.UiRefreshReason.Reason;
import com.google.search.now.feed.client.StreamDataProto.UiContext;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InOrder;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.robolectric.Robolectric;
import org.robolectric.RobolectricTestRunner;

/** Tests for {@link ZeroStateDriver}. */
@RunWith(RobolectricTestRunner.class)
public class ZeroStateDriverTest {

  private static final UiContext ZERO_STATE_UI_CONTEXT =
      UiContext.newBuilder()
          .setExtension(
              UiRefreshReason.uiRefreshReasonExtension,
              UiRefreshReason.newBuilder().setReason(Reason.ZERO_STATE).build())
          .build();

  @Mock private BasicLoggingApi basicLoggingApi;
  @Mock private ContentChangedListener contentChangedListener;
  @Mock private ModelProvider modelProvider;
  @Mock private SpinnerLogger spinnerLogger;
  @Mock private ZeroStateViewHolder zeroStateViewHolder;

  private ZeroStateDriver zeroStateDriver;
  private Clock clock;
  private Context context;

  @Before
  public void setup() {
    initMocks(this);
    clock = new FakeClock();
    context = Robolectric.buildActivity(Activity.class).get();

    zeroStateDriver =
        new ZeroStateDriverForTest(
            basicLoggingApi,
            clock,
            modelProvider,
            contentChangedListener,
            /* spinnerShown= */ false);
  }

  @Test
  public void testBind() {
    assertThat(zeroStateDriver.isBound()).isFalse();

    zeroStateDriver.bind(zeroStateViewHolder);

    assertThat(zeroStateDriver.isBound()).isTrue();
    verify(zeroStateViewHolder).bind(zeroStateDriver, /* showSpinner= */ false);
  }

  @Test
  public void testBind_whenSpinnerShownTrue() {
    zeroStateDriver =
        new ZeroStateDriverForTest(
            basicLoggingApi,
            clock,
            modelProvider,
            contentChangedListener,
            /* spinnerShown= */ true);

    zeroStateDriver.bind(zeroStateViewHolder);
    verify(zeroStateViewHolder).bind(zeroStateDriver, /* showSpinner= */ true);
  }

  @Test
  public void testBindAfterOnClick_bindsViewholderWithSpinnerShown() {
    InOrder inOrder = Mockito.inOrder(zeroStateViewHolder);
    zeroStateDriver.bind(zeroStateViewHolder);
    inOrder.verify(zeroStateViewHolder).bind(zeroStateDriver, /* showSpinner= */ false);

    zeroStateDriver.onClick(new FrameLayout(context));
    zeroStateDriver.unbind();

    zeroStateDriver.bind(zeroStateViewHolder);

    inOrder.verify(zeroStateViewHolder).bind(zeroStateDriver, /* showSpinner= */ true);
  }

  @Test
  public void testBind_startsRecordingSpinner_ifSpinnerIsShownAndNotLogged() {
    when(spinnerLogger.isSpinnerActive()).thenReturn(false);
    zeroStateDriver =
        new ZeroStateDriverForTest(
            basicLoggingApi,
            clock,
            modelProvider,
            contentChangedListener,
            /* spinnerShown= */ true);
    zeroStateDriver.bind(zeroStateViewHolder);

    verify(spinnerLogger).spinnerStarted(SpinnerType.INITIAL_LOAD);
  }

  @Test
  public void testBind_doesNotStartRecordingSpinner_ifSpinnerIsNotShownAndNotLogged() {
    when(spinnerLogger.isSpinnerActive()).thenReturn(false);
    zeroStateDriver.bind(zeroStateViewHolder);

    verifyNoMoreInteractions(spinnerLogger);
  }

  @Test
  public void testBind_doesNotStartRecordingSpinner_ifSpinnerIsShownAndAlreadyLogged() {
    when(spinnerLogger.isSpinnerActive()).thenReturn(true);
    zeroStateDriver =
        new ZeroStateDriverForTest(
            basicLoggingApi,
            clock,
            modelProvider,
            contentChangedListener,
            /* spinnerShown= */ true);
    zeroStateDriver.bind(zeroStateViewHolder);

    verify(spinnerLogger, never()).spinnerStarted(anyInt());
  }

  @Test
  public void testUnbind() {
    zeroStateDriver.bind(zeroStateViewHolder);
    assertThat(zeroStateDriver.isBound()).isTrue();

    zeroStateDriver.unbind();

    assertThat(zeroStateDriver.isBound()).isFalse();
    verify(zeroStateViewHolder).unbind();
  }

  @Test
  public void testUnbind_doesNotCallUnbindIfNotBound() {
    assertThat(zeroStateDriver.isBound()).isFalse();

    zeroStateDriver.unbind();
    verifyNoMoreInteractions(zeroStateViewHolder);
  }

  @Test
  public void testOnClick() {
    zeroStateDriver.bind(zeroStateViewHolder);

    zeroStateDriver.onClick(new FrameLayout(context));

    verify(zeroStateViewHolder).showSpinner(true);
    verify(contentChangedListener).onContentChanged();
    verify(modelProvider).triggerRefresh(RequestReason.ZERO_STATE, ZERO_STATE_UI_CONTEXT);
  }

  @Test
  public void testOnClick_usesNewModelProvider_afterSettingNewModelProvider() {
    ModelProvider newModelProvider = mock(ModelProvider.class);
    zeroStateDriver.setModelProvider(newModelProvider);
    zeroStateDriver.bind(zeroStateViewHolder);

    zeroStateDriver.onClick(new FrameLayout(context));

    verify(newModelProvider).triggerRefresh(RequestReason.ZERO_STATE, ZERO_STATE_UI_CONTEXT);
  }

  @Test
  public void testOnClick_startsRecordingSpinner_ifSpinnerNotActive() {
    when(spinnerLogger.isSpinnerActive()).thenReturn(false);
    zeroStateDriver.bind(zeroStateViewHolder);

    zeroStateDriver.onClick(new FrameLayout(context));

    verify(spinnerLogger).spinnerStarted(SpinnerType.ZERO_STATE_REFRESH);
  }

  @Test
  public void testOnClick_throwsRuntimeException_ifSpinnerActive() {
    when(spinnerLogger.isSpinnerActive()).thenReturn(true);
    zeroStateDriver =
        new ZeroStateDriverForTest(
            basicLoggingApi,
            clock,
            modelProvider,
            contentChangedListener,
            /* spinnerShown= */ true);

    zeroStateDriver.bind(zeroStateViewHolder);
    reset(spinnerLogger);

    assertThatRunnable(() -> zeroStateDriver.onClick(new FrameLayout(context)));
  }

  @Test
  public void testOnDestroy_logsSpinnerFinished_ifSpinnerActive() {
    when(spinnerLogger.isSpinnerActive()).thenReturn(true);
    zeroStateDriver =
        new ZeroStateDriverForTest(
            basicLoggingApi,
            clock,
            modelProvider,
            contentChangedListener,
            /* spinnerShown= */ true);
    zeroStateDriver.bind(zeroStateViewHolder);

    zeroStateDriver.onDestroy();

    verify(spinnerLogger).spinnerFinished();
  }

  @Test
  public void testOnDestroy_doesNotLogSpinnerFinished_ifSpinnerNotActive() {
    when(spinnerLogger.isSpinnerActive()).thenReturn(false);
    zeroStateDriver.bind(zeroStateViewHolder);

    zeroStateDriver.onDestroy();
    verify(spinnerLogger, never()).spinnerFinished();
  }

  @Test
  public void testMaybeRebind() {
    zeroStateDriver.bind(zeroStateViewHolder);
    assertThat(zeroStateDriver.isBound()).isTrue();
    zeroStateDriver.maybeRebind();
    assertThat(zeroStateDriver.isBound()).isTrue();
    verify(zeroStateViewHolder, times(2)).bind(zeroStateDriver, /* showSpinner= */ false);
    verify(zeroStateViewHolder).unbind();
  }

  @Test
  public void testMaybeRebind_nullViewHolder() {
    zeroStateDriver.bind(zeroStateViewHolder);
    zeroStateDriver.unbind();
    reset(zeroStateViewHolder);

    assertThat(zeroStateDriver.isBound()).isFalse();
    zeroStateDriver.maybeRebind();
    assertThat(zeroStateDriver.isBound()).isFalse();
    verify(zeroStateViewHolder, never()).bind(any(OnClickListener.class), anyBoolean());
    verify(zeroStateViewHolder, never()).unbind();
  }

  private final class ZeroStateDriverForTest extends ZeroStateDriver {

    ZeroStateDriverForTest(
        BasicLoggingApi basicLoggingApi,
        Clock clock,
        ModelProvider modelProvider,
        ContentChangedListener contentChangedListener,
        boolean spinnerShown) {
      super(basicLoggingApi, clock, modelProvider, contentChangedListener, spinnerShown);
    }

    @Override
    SpinnerLogger createSpinnerLogger(BasicLoggingApi basicLoggingApi, Clock clock) {
      return spinnerLogger;
    }
  }
}