/**
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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 org.apache.hadoop.hbase.hbtop.screen.mode;
  
  import static org.hamcrest.CoreMatchers.is;
  import static org.junit.Assert.assertThat;
  import static org.mockito.Mockito.any;
  import static org.mockito.Mockito.eq;
  import static org.mockito.Mockito.never;
  import static org.mockito.Mockito.verify;
  
  import java.util.Arrays;
  import org.apache.hadoop.hbase.hbtop.mode.Mode;
  import org.apache.hadoop.hbase.hbtop.screen.ScreenView;
  import org.apache.hadoop.hbase.hbtop.screen.top.TopScreenView;
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.runner.RunWith;
  import org.mockito.Mock;
  import org.mockito.runners.MockitoJUnitRunner;
  
  @Category(SmallTests.class)
  @RunWith(MockitoJUnitRunner.class)
  public class TestModeScreenPresenter {
  
    @Mock
    private ModeScreenView modeScreenView;
  
    @Mock
    private TopScreenView topScreenView;
  
    @Mock
    private ModeScreenPresenter.ResultListener resultListener;
  
    private ModeScreenPresenter createModeScreenPresenter(Mode currentMode) {
      return new ModeScreenPresenter(modeScreenView, currentMode, resultListener, topScreenView);
    }
  
    @Test
    public void testInit() {
      ModeScreenPresenter modeScreenPresenter = createModeScreenPresenter(Mode.REGION);
  
      modeScreenPresenter.init();
  
      int modeHeaderMaxLength = Mode.REGION_SERVER.getHeader().length();
      int modeDescriptionMaxLength = Mode.REGION_SERVER.getDescription().length();
  
      verify(modeScreenView).showModeScreen(eq(Mode.REGION), eq(Arrays.asList(Mode.values())),
        eq(Mode.REGION.ordinal()) , eq(modeHeaderMaxLength), eq(modeDescriptionMaxLength));
    }
  
    @Test
    public void testSelectNamespaceMode() {
      ModeScreenPresenter modeScreenPresenter = createModeScreenPresenter(Mode.REGION);
  
      modeScreenPresenter.arrowUp();
      modeScreenPresenter.arrowUp();
  
      assertThat(modeScreenPresenter.transitionToNextScreen(true), is((ScreenView) topScreenView));
      verify(resultListener).accept(eq(Mode.NAMESPACE));
    }
  
    @Test
    public void testSelectTableMode() {
      ModeScreenPresenter modeScreenPresenter = createModeScreenPresenter(Mode.REGION);
  
      modeScreenPresenter.arrowUp();
      assertThat(modeScreenPresenter.transitionToNextScreen(true), is((ScreenView) topScreenView));
      verify(resultListener).accept(eq(Mode.TABLE));
    }
  
    @Test
    public void testSelectRegionMode() {
      ModeScreenPresenter modeScreenPresenter = createModeScreenPresenter(Mode.NAMESPACE);
  
      modeScreenPresenter.arrowDown();
      modeScreenPresenter.arrowDown();
  
      assertThat(modeScreenPresenter.transitionToNextScreen(true), is((ScreenView) topScreenView));
      verify(resultListener).accept(eq(Mode.REGION));
    }
  
    @Test
   public void testSelectRegionServerMode() {
     ModeScreenPresenter modeScreenPresenter = createModeScreenPresenter(Mode.REGION);
 
     modeScreenPresenter.arrowDown();
 
     assertThat(modeScreenPresenter.transitionToNextScreen(true), is((ScreenView) topScreenView));
     verify(resultListener).accept(eq(Mode.REGION_SERVER));
   }
 
   @Test
   public void testCancelSelectingMode() {
     ModeScreenPresenter modeScreenPresenter = createModeScreenPresenter(Mode.REGION);
 
     modeScreenPresenter.arrowDown();
     modeScreenPresenter.arrowDown();
 
     assertThat(modeScreenPresenter.transitionToNextScreen(false), is((ScreenView) topScreenView));
     verify(resultListener, never()).accept(any(Mode.class));
   }
 
   @Test
   public void testPageUp() {
     ModeScreenPresenter modeScreenPresenter = createModeScreenPresenter(Mode.REGION);
 
     modeScreenPresenter.pageUp();
 
     assertThat(modeScreenPresenter.transitionToNextScreen(true), is((ScreenView) topScreenView));
     verify(resultListener).accept(eq(Mode.values()[0]));
   }
 
   @Test
   public void testPageDown() {
     ModeScreenPresenter modeScreenPresenter = createModeScreenPresenter(Mode.REGION);
 
     modeScreenPresenter.pageDown();
 
     assertThat(modeScreenPresenter.transitionToNextScreen(true), is((ScreenView) topScreenView));
     Mode[] modes = Mode.values();
     verify(resultListener).accept(eq(modes[modes.length - 1]));
   }
 }