// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package io.flutter.plugins.camera.features.exposureoffset;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import android.hardware.camera2.CaptureRequest;
import io.flutter.plugins.camera.CameraProperties;
import org.junit.Test;

public class ExposureOffsetFeatureTest {
  @Test
  public void getDebugName_shouldReturnTheNameOfTheFeature() {
    CameraProperties mockCameraProperties = mock(CameraProperties.class);
    ExposureOffsetFeature exposureOffsetFeature = new ExposureOffsetFeature(mockCameraProperties);

    assertEquals("ExposureOffsetFeature", exposureOffsetFeature.getDebugName());
  }

  @Test
  public void getValue_shouldReturnZeroIfNotSet() {
    CameraProperties mockCameraProperties = mock(CameraProperties.class);
    ExposureOffsetFeature exposureOffsetFeature = new ExposureOffsetFeature(mockCameraProperties);

    final double actualValue = exposureOffsetFeature.getValue();

    assertEquals(0.0, actualValue, 0);
  }

  @Test
  public void getValue_shouldEchoTheSetValue() {
    CameraProperties mockCameraProperties = mock(CameraProperties.class);
    ExposureOffsetFeature exposureOffsetFeature = new ExposureOffsetFeature(mockCameraProperties);
    double expectedValue = 4.0;

    when(mockCameraProperties.getControlAutoExposureCompensationStep()).thenReturn(0.5);

    exposureOffsetFeature.setValue(2.0);
    double actualValue = exposureOffsetFeature.getValue();

    assertEquals(expectedValue, actualValue, 0);
  }

  @Test
  public void getExposureOffsetStepSize_shouldReturnTheControlExposureCompensationStepValue() {
    CameraProperties mockCameraProperties = mock(CameraProperties.class);
    ExposureOffsetFeature exposureOffsetFeature = new ExposureOffsetFeature(mockCameraProperties);

    when(mockCameraProperties.getControlAutoExposureCompensationStep()).thenReturn(0.5);

    assertEquals(0.5, exposureOffsetFeature.getExposureOffsetStepSize(), 0);
  }

  @Test
  public void checkIsSupported_shouldReturnTrue() {
    CameraProperties mockCameraProperties = mock(CameraProperties.class);
    ExposureOffsetFeature exposureOffsetFeature = new ExposureOffsetFeature(mockCameraProperties);

    assertTrue(exposureOffsetFeature.checkIsSupported());
  }

  @Test
  public void updateBuilder_shouldSetControlAeExposureCompensationToOffset() {
    CameraProperties mockCameraProperties = mock(CameraProperties.class);
    CaptureRequest.Builder mockBuilder = mock(CaptureRequest.Builder.class);
    ExposureOffsetFeature exposureOffsetFeature = new ExposureOffsetFeature(mockCameraProperties);

    when(mockCameraProperties.getControlAutoExposureCompensationStep()).thenReturn(0.5);

    exposureOffsetFeature.setValue(2.0);
    exposureOffsetFeature.updateBuilder(mockBuilder);

    verify(mockBuilder, times(1)).set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, 4);
  }
}