// 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.

import 'dart:async';
import 'dart:math';
import 'dart:ui';

import 'package:camera/camera.dart';
import 'package:camera_platform_interface/camera_platform_interface.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:mockito/mockito.dart';
import 'package:plugin_platform_interface/plugin_platform_interface.dart';

get mockAvailableCameras => [
      CameraDescription(
          name: 'camBack',
          lensDirection: CameraLensDirection.back,
          sensorOrientation: 90),
      CameraDescription(
          name: 'camFront',
          lensDirection: CameraLensDirection.front,
          sensorOrientation: 180),
    ];

get mockInitializeCamera => 13;

get mockOnCameraInitializedEvent => CameraInitializedEvent(
      13,
      75,
      75,
      ExposureMode.auto,
      true,
      FocusMode.auto,
      true,
    );

get mockOnDeviceOrientationChangedEvent =>
    DeviceOrientationChangedEvent(DeviceOrientation.portraitUp);

get mockOnCameraClosingEvent => null;

get mockOnCameraErrorEvent => CameraErrorEvent(13, 'closing');

XFile mockTakePicture = XFile('foo/bar.png');

get mockVideoRecordingXFile => null;

bool mockPlatformException = false;

void main() {
  WidgetsFlutterBinding.ensureInitialized();

  group('camera', () {
    test('debugCheckIsDisposed should not throw assertion error when disposed',
        () {
      final MockCameraDescription description = MockCameraDescription();
      final CameraController controller = CameraController(
        description,
        ResolutionPreset.low,
      );

      controller.dispose();

      expect(controller.debugCheckIsDisposed, returnsNormally);
    });

    test('debugCheckIsDisposed should throw assertion error when not disposed',
        () {
      final MockCameraDescription description = MockCameraDescription();
      final CameraController controller = CameraController(
        description,
        ResolutionPreset.low,
      );

      expect(
        () => controller.debugCheckIsDisposed(),
        throwsAssertionError,
      );
    });

    test('availableCameras() has camera', () async {
      CameraPlatform.instance = MockCameraPlatform();

      var camList = await availableCameras();

      expect(camList, equals(mockAvailableCameras));
    });
  });

  group('$CameraController', () {
    setUpAll(() {
      CameraPlatform.instance = MockCameraPlatform();
    });

    test('Can be initialized', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      expect(cameraController.value.aspectRatio, 1);
      expect(cameraController.value.previewSize, Size(75, 75));
      expect(cameraController.value.isInitialized, isTrue);
    });

    test('can be disposed', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      expect(cameraController.value.aspectRatio, 1);
      expect(cameraController.value.previewSize, Size(75, 75));
      expect(cameraController.value.isInitialized, isTrue);

      await cameraController.dispose();

      verify(CameraPlatform.instance.dispose(13)).called(1);
    });

    test('initialize() throws CameraException when disposed', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      expect(cameraController.value.aspectRatio, 1);
      expect(cameraController.value.previewSize, Size(75, 75));
      expect(cameraController.value.isInitialized, isTrue);

      await cameraController.dispose();

      verify(CameraPlatform.instance.dispose(13)).called(1);

      expect(
          cameraController.initialize,
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'Error description',
            'initialize was called on a disposed CameraController',
          )));
    });

    test('initialize() throws $CameraException on $PlatformException ',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      mockPlatformException = true;

      expect(
          cameraController.initialize,
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'foo',
            'bar',
          )));
      mockPlatformException = false;
    });

    test('initialize() sets imageFormat', () async {
      debugDefaultTargetPlatformOverride = TargetPlatform.android;
      CameraController cameraController = CameraController(
        CameraDescription(
            name: 'cam',
            lensDirection: CameraLensDirection.back,
            sensorOrientation: 90),
        ResolutionPreset.max,
        imageFormatGroup: ImageFormatGroup.yuv420,
      );
      await cameraController.initialize();
      verify(CameraPlatform.instance
              .initializeCamera(13, imageFormatGroup: ImageFormatGroup.yuv420))
          .called(1);
    });

    test('prepareForVideoRecording() calls $CameraPlatform ', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      await cameraController.prepareForVideoRecording();

      verify(CameraPlatform.instance.prepareForVideoRecording()).called(1);
    });

    test('takePicture() throws $CameraException when uninitialized ', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      expect(
        cameraController.takePicture(),
        throwsA(
          isA<CameraException>()
              .having(
                (error) => error.code,
                'code',
                'Uninitialized CameraController',
              )
              .having(
                (error) => error.description,
                'description',
                'takePicture() was called on an uninitialized CameraController.',
              ),
        ),
      );
    });

    test('takePicture() throws $CameraException when takePicture is true',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      cameraController.value =
          cameraController.value.copyWith(isTakingPicture: true);
      expect(
          cameraController.takePicture(),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'Previous capture has not returned yet.',
            'takePicture was called before the previous capture returned.',
          )));
    });

    test('takePicture() returns $XFile', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();
      XFile xFile = await cameraController.takePicture();

      expect(xFile.path, mockTakePicture.path);
    });

    test('takePicture() throws $CameraException on $PlatformException',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      mockPlatformException = true;
      expect(
          cameraController.takePicture(),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'foo',
            'bar',
          )));
      mockPlatformException = false;
    });

    test('startVideoRecording() throws $CameraException when uninitialized',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      expect(
        cameraController.startVideoRecording(),
        throwsA(
          isA<CameraException>()
              .having(
                (error) => error.code,
                'code',
                'Uninitialized CameraController',
              )
              .having(
                (error) => error.description,
                'description',
                'startVideoRecording() was called on an uninitialized CameraController.',
              ),
        ),
      );
    });
    test('startVideoRecording() throws $CameraException when recording videos',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      await cameraController.initialize();

      cameraController.value =
          cameraController.value.copyWith(isRecordingVideo: true);

      expect(
          cameraController.startVideoRecording(),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'A video recording is already started.',
            'startVideoRecording was called when a recording is already started.',
          )));
    });

    test(
        'startVideoRecording() throws $CameraException when already streaming images',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      await cameraController.initialize();

      cameraController.value =
          cameraController.value.copyWith(isStreamingImages: true);

      expect(
          cameraController.startVideoRecording(),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'A camera has started streaming images.',
            'startVideoRecording was called while a camera was streaming images.',
          )));
    });

    test('getMaxZoomLevel() throws $CameraException when uninitialized',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      expect(
        cameraController.getMaxZoomLevel,
        throwsA(
          isA<CameraException>()
              .having(
                (error) => error.code,
                'code',
                'Uninitialized CameraController',
              )
              .having(
                (error) => error.description,
                'description',
                'getMaxZoomLevel() was called on an uninitialized CameraController.',
              ),
        ),
      );
    });

    test('getMaxZoomLevel() throws $CameraException when disposed', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      await cameraController.initialize();
      await cameraController.dispose();

      expect(
        cameraController.getMaxZoomLevel,
        throwsA(
          isA<CameraException>()
              .having(
                (error) => error.code,
                'code',
                'Disposed CameraController',
              )
              .having(
                (error) => error.description,
                'description',
                'getMaxZoomLevel() was called on a disposed CameraController.',
              ),
        ),
      );
    });

    test(
        'getMaxZoomLevel() throws $CameraException when a platform exception occured.',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      await cameraController.initialize();
      when(CameraPlatform.instance.getMaxZoomLevel(mockInitializeCamera))
          .thenThrow(CameraException(
        'TEST_ERROR',
        'This is a test error messge',
      ));

      expect(
          cameraController.getMaxZoomLevel,
          throwsA(isA<CameraException>()
              .having((error) => error.code, 'code', 'TEST_ERROR')
              .having(
                (error) => error.description,
                'description',
                'This is a test error messge',
              )));
    });

    test('getMaxZoomLevel() returns max zoom level.', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      await cameraController.initialize();
      when(CameraPlatform.instance.getMaxZoomLevel(mockInitializeCamera))
          .thenAnswer((_) => Future.value(42.0));

      final maxZoomLevel = await cameraController.getMaxZoomLevel();
      expect(maxZoomLevel, 42.0);
    });

    test('getMinZoomLevel() throws $CameraException when uninitialized',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      expect(
        cameraController.getMinZoomLevel,
        throwsA(
          isA<CameraException>()
              .having(
                (error) => error.code,
                'code',
                'Uninitialized CameraController',
              )
              .having(
                (error) => error.description,
                'description',
                'getMinZoomLevel() was called on an uninitialized CameraController.',
              ),
        ),
      );
    });

    test('getMinZoomLevel() throws $CameraException when disposed', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      await cameraController.initialize();
      await cameraController.dispose();

      expect(
        cameraController.getMinZoomLevel,
        throwsA(
          isA<CameraException>()
              .having(
                (error) => error.code,
                'code',
                'Disposed CameraController',
              )
              .having(
                (error) => error.description,
                'description',
                'getMinZoomLevel() was called on a disposed CameraController.',
              ),
        ),
      );
    });

    test(
        'getMinZoomLevel() throws $CameraException when a platform exception occured.',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      await cameraController.initialize();
      when(CameraPlatform.instance.getMinZoomLevel(mockInitializeCamera))
          .thenThrow(CameraException(
        'TEST_ERROR',
        'This is a test error messge',
      ));

      expect(
          cameraController.getMinZoomLevel,
          throwsA(isA<CameraException>()
              .having((error) => error.code, 'code', 'TEST_ERROR')
              .having(
                (error) => error.description,
                'description',
                'This is a test error messge',
              )));
    });

    test('getMinZoomLevel() returns max zoom level.', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      await cameraController.initialize();
      when(CameraPlatform.instance.getMinZoomLevel(mockInitializeCamera))
          .thenAnswer((_) => Future.value(42.0));

      final maxZoomLevel = await cameraController.getMinZoomLevel();
      expect(maxZoomLevel, 42.0);
    });

    test('setZoomLevel() throws $CameraException when uninitialized', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      expect(
        () => cameraController.setZoomLevel(42.0),
        throwsA(
          isA<CameraException>()
              .having(
                (error) => error.code,
                'code',
                'Uninitialized CameraController',
              )
              .having(
                (error) => error.description,
                'description',
                'setZoomLevel() was called on an uninitialized CameraController.',
              ),
        ),
      );
    });

    test('setZoomLevel() throws $CameraException when disposed', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      await cameraController.initialize();
      await cameraController.dispose();

      expect(
        () => cameraController.setZoomLevel(42.0),
        throwsA(
          isA<CameraException>()
              .having(
                (error) => error.code,
                'code',
                'Disposed CameraController',
              )
              .having(
                (error) => error.description,
                'description',
                'setZoomLevel() was called on a disposed CameraController.',
              ),
        ),
      );
    });

    test(
        'setZoomLevel() throws $CameraException when a platform exception occured.',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      await cameraController.initialize();
      when(CameraPlatform.instance.setZoomLevel(mockInitializeCamera, 42.0))
          .thenThrow(CameraException(
        'TEST_ERROR',
        'This is a test error messge',
      ));

      expect(
          () => cameraController.setZoomLevel(42),
          throwsA(isA<CameraException>()
              .having((error) => error.code, 'code', 'TEST_ERROR')
              .having(
                (error) => error.description,
                'description',
                'This is a test error messge',
              )));

      reset(CameraPlatform.instance);
    });

    test(
        'setZoomLevel() completes and calls method channel with correct value.',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);

      await cameraController.initialize();
      await cameraController.setZoomLevel(42.0);

      verify(CameraPlatform.instance.setZoomLevel(mockInitializeCamera, 42.0))
          .called(1);
    });

    test('setFlashMode() calls $CameraPlatform', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      await cameraController.setFlashMode(FlashMode.always);

      verify(CameraPlatform.instance
              .setFlashMode(cameraController.cameraId, FlashMode.always))
          .called(1);
    });

    test('setFlashMode() throws $CameraException on $PlatformException',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      when(CameraPlatform.instance
              .setFlashMode(cameraController.cameraId, FlashMode.always))
          .thenThrow(
        PlatformException(
          code: 'TEST_ERROR',
          message: 'This is a test error message',
          details: null,
        ),
      );

      expect(
          cameraController.setFlashMode(FlashMode.always),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'TEST_ERROR',
            'This is a test error message',
          )));
    });

    test('setExposureMode() calls $CameraPlatform', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      await cameraController.setExposureMode(ExposureMode.auto);

      verify(CameraPlatform.instance
              .setExposureMode(cameraController.cameraId, ExposureMode.auto))
          .called(1);
    });

    test('setExposureMode() throws $CameraException on $PlatformException',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      when(CameraPlatform.instance
              .setExposureMode(cameraController.cameraId, ExposureMode.auto))
          .thenThrow(
        PlatformException(
          code: 'TEST_ERROR',
          message: 'This is a test error message',
          details: null,
        ),
      );

      expect(
          cameraController.setExposureMode(ExposureMode.auto),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'TEST_ERROR',
            'This is a test error message',
          )));
    });

    test('setExposurePoint() calls $CameraPlatform', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      await cameraController.setExposurePoint(Offset(0.5, 0.5));

      verify(CameraPlatform.instance.setExposurePoint(
              cameraController.cameraId, Point<double>(0.5, 0.5)))
          .called(1);
    });

    test('setExposurePoint() throws $CameraException on $PlatformException',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      when(CameraPlatform.instance.setExposurePoint(
              cameraController.cameraId, Point<double>(0.5, 0.5)))
          .thenThrow(
        PlatformException(
          code: 'TEST_ERROR',
          message: 'This is a test error message',
          details: null,
        ),
      );

      expect(
          cameraController.setExposurePoint(Offset(0.5, 0.5)),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'TEST_ERROR',
            'This is a test error message',
          )));
    });

    test('getMinExposureOffset() calls $CameraPlatform', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      when(CameraPlatform.instance
              .getMinExposureOffset(cameraController.cameraId))
          .thenAnswer((_) => Future.value(0.0));

      await cameraController.getMinExposureOffset();

      verify(CameraPlatform.instance
              .getMinExposureOffset(cameraController.cameraId))
          .called(1);
    });

    test('getMinExposureOffset() throws $CameraException on $PlatformException',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      when(CameraPlatform.instance
              .getMinExposureOffset(cameraController.cameraId))
          .thenThrow(
        CameraException(
          'TEST_ERROR',
          'This is a test error message',
        ),
      );

      expect(
          cameraController.getMinExposureOffset(),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'TEST_ERROR',
            'This is a test error message',
          )));
    });

    test('getMaxExposureOffset() calls $CameraPlatform', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      when(CameraPlatform.instance
              .getMaxExposureOffset(cameraController.cameraId))
          .thenAnswer((_) => Future.value(1.0));

      await cameraController.getMaxExposureOffset();

      verify(CameraPlatform.instance
              .getMaxExposureOffset(cameraController.cameraId))
          .called(1);
    });

    test('getMaxExposureOffset() throws $CameraException on $PlatformException',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      when(CameraPlatform.instance
              .getMaxExposureOffset(cameraController.cameraId))
          .thenThrow(
        CameraException(
          'TEST_ERROR',
          'This is a test error message',
        ),
      );

      expect(
          cameraController.getMaxExposureOffset(),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'TEST_ERROR',
            'This is a test error message',
          )));
    });

    test('getExposureOffsetStepSize() calls $CameraPlatform', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      when(CameraPlatform.instance
              .getExposureOffsetStepSize(cameraController.cameraId))
          .thenAnswer((_) => Future.value(0.0));

      await cameraController.getExposureOffsetStepSize();

      verify(CameraPlatform.instance
              .getExposureOffsetStepSize(cameraController.cameraId))
          .called(1);
    });

    test(
        'getExposureOffsetStepSize() throws $CameraException on $PlatformException',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      when(CameraPlatform.instance
              .getExposureOffsetStepSize(cameraController.cameraId))
          .thenThrow(
        CameraException(
          'TEST_ERROR',
          'This is a test error message',
        ),
      );

      expect(
          cameraController.getExposureOffsetStepSize(),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'TEST_ERROR',
            'This is a test error message',
          )));
    });

    test('setExposureOffset() calls $CameraPlatform', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();
      when(CameraPlatform.instance
              .getMinExposureOffset(cameraController.cameraId))
          .thenAnswer((_) async => -1.0);
      when(CameraPlatform.instance
              .getMaxExposureOffset(cameraController.cameraId))
          .thenAnswer((_) async => 2.0);
      when(CameraPlatform.instance
              .getExposureOffsetStepSize(cameraController.cameraId))
          .thenAnswer((_) async => 1.0);
      when(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 1.0))
          .thenAnswer((_) async => 1.0);

      await cameraController.setExposureOffset(1.0);

      verify(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 1.0))
          .called(1);
    });

    test('setExposureOffset() throws $CameraException on $PlatformException',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();
      when(CameraPlatform.instance
              .getMinExposureOffset(cameraController.cameraId))
          .thenAnswer((_) async => -1.0);
      when(CameraPlatform.instance
              .getMaxExposureOffset(cameraController.cameraId))
          .thenAnswer((_) async => 2.0);
      when(CameraPlatform.instance
              .getExposureOffsetStepSize(cameraController.cameraId))
          .thenAnswer((_) async => 1.0);
      when(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 1.0))
          .thenThrow(
        CameraException(
          'TEST_ERROR',
          'This is a test error message',
        ),
      );

      expect(
          cameraController.setExposureOffset(1.0),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'TEST_ERROR',
            'This is a test error message',
          )));
    });

    test(
        'setExposureOffset() throws $CameraException when offset is out of bounds',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();
      when(CameraPlatform.instance
              .getMinExposureOffset(cameraController.cameraId))
          .thenAnswer((_) async => -1.0);
      when(CameraPlatform.instance
              .getMaxExposureOffset(cameraController.cameraId))
          .thenAnswer((_) async => 2.0);
      when(CameraPlatform.instance
              .getExposureOffsetStepSize(cameraController.cameraId))
          .thenAnswer((_) async => 1.0);
      when(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 0.0))
          .thenAnswer((_) async => 0.0);
      when(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, -1.0))
          .thenAnswer((_) async => 0.0);
      when(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 2.0))
          .thenAnswer((_) async => 0.0);

      expect(
          cameraController.setExposureOffset(3.0),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'exposureOffsetOutOfBounds',
            'The provided exposure offset was outside the supported range for this device.',
          )));
      expect(
          cameraController.setExposureOffset(-2.0),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'exposureOffsetOutOfBounds',
            'The provided exposure offset was outside the supported range for this device.',
          )));

      await cameraController.setExposureOffset(0.0);
      await cameraController.setExposureOffset(-1.0);
      await cameraController.setExposureOffset(2.0);

      verify(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 0.0))
          .called(1);
      verify(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, -1.0))
          .called(1);
      verify(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 2.0))
          .called(1);
    });

    test('setExposureOffset() rounds offset to nearest step', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();
      when(CameraPlatform.instance
              .getMinExposureOffset(cameraController.cameraId))
          .thenAnswer((_) async => -1.2);
      when(CameraPlatform.instance
              .getMaxExposureOffset(cameraController.cameraId))
          .thenAnswer((_) async => 1.2);
      when(CameraPlatform.instance
              .getExposureOffsetStepSize(cameraController.cameraId))
          .thenAnswer((_) async => 0.4);

      when(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, -1.2))
          .thenAnswer((_) async => -1.2);
      when(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, -0.8))
          .thenAnswer((_) async => -0.8);
      when(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, -0.4))
          .thenAnswer((_) async => -0.4);
      when(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 0.0))
          .thenAnswer((_) async => 0.0);
      when(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 0.4))
          .thenAnswer((_) async => 0.4);
      when(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 0.8))
          .thenAnswer((_) async => 0.8);
      when(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 1.2))
          .thenAnswer((_) async => 1.2);

      await cameraController.setExposureOffset(1.2);
      await cameraController.setExposureOffset(-1.2);
      await cameraController.setExposureOffset(0.1);
      await cameraController.setExposureOffset(0.2);
      await cameraController.setExposureOffset(0.3);
      await cameraController.setExposureOffset(0.4);
      await cameraController.setExposureOffset(0.5);
      await cameraController.setExposureOffset(0.6);
      await cameraController.setExposureOffset(0.7);
      await cameraController.setExposureOffset(-0.1);
      await cameraController.setExposureOffset(-0.2);
      await cameraController.setExposureOffset(-0.3);
      await cameraController.setExposureOffset(-0.4);
      await cameraController.setExposureOffset(-0.5);
      await cameraController.setExposureOffset(-0.6);
      await cameraController.setExposureOffset(-0.7);

      verify(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 0.8))
          .called(2);
      verify(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, -0.8))
          .called(2);
      verify(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 0.0))
          .called(2);
      verify(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, 0.4))
          .called(4);
      verify(CameraPlatform.instance
              .setExposureOffset(cameraController.cameraId, -0.4))
          .called(4);
    });

    test('pausePreview() calls $CameraPlatform', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();
      cameraController.value = cameraController.value
          .copyWith(deviceOrientation: DeviceOrientation.portraitUp);

      await cameraController.pausePreview();

      verify(CameraPlatform.instance.pausePreview(cameraController.cameraId))
          .called(1);
      expect(cameraController.value.isPreviewPaused, equals(true));
      expect(cameraController.value.previewPauseOrientation,
          DeviceOrientation.portraitUp);
    });

    test('pausePreview() does not call $CameraPlatform when already paused',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();
      cameraController.value =
          cameraController.value.copyWith(isPreviewPaused: true);

      await cameraController.pausePreview();

      verifyNever(
          CameraPlatform.instance.pausePreview(cameraController.cameraId));
      expect(cameraController.value.isPreviewPaused, equals(true));
    });

    test('pausePreview() throws $CameraException on $PlatformException',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();
      when(CameraPlatform.instance.pausePreview(cameraController.cameraId))
          .thenThrow(
        PlatformException(
          code: 'TEST_ERROR',
          message: 'This is a test error message',
          details: null,
        ),
      );

      expect(
          cameraController.pausePreview(),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'TEST_ERROR',
            'This is a test error message',
          )));
    });

    test('resumePreview() calls $CameraPlatform', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();
      cameraController.value =
          cameraController.value.copyWith(isPreviewPaused: true);

      await cameraController.resumePreview();

      verify(CameraPlatform.instance.resumePreview(cameraController.cameraId))
          .called(1);
      expect(cameraController.value.isPreviewPaused, equals(false));
    });

    test('resumePreview() does not call $CameraPlatform when not paused',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();
      cameraController.value =
          cameraController.value.copyWith(isPreviewPaused: false);

      await cameraController.resumePreview();

      verifyNever(
          CameraPlatform.instance.resumePreview(cameraController.cameraId));
      expect(cameraController.value.isPreviewPaused, equals(false));
    });

    test('resumePreview() throws $CameraException on $PlatformException',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();
      cameraController.value =
          cameraController.value.copyWith(isPreviewPaused: true);
      when(CameraPlatform.instance.resumePreview(cameraController.cameraId))
          .thenThrow(
        PlatformException(
          code: 'TEST_ERROR',
          message: 'This is a test error message',
          details: null,
        ),
      );

      expect(
          cameraController.resumePreview(),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'TEST_ERROR',
            'This is a test error message',
          )));
    });

    test('lockCaptureOrientation() calls $CameraPlatform', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      await cameraController.lockCaptureOrientation();
      expect(cameraController.value.lockedCaptureOrientation,
          equals(DeviceOrientation.portraitUp));
      await cameraController
          .lockCaptureOrientation(DeviceOrientation.landscapeRight);
      expect(cameraController.value.lockedCaptureOrientation,
          equals(DeviceOrientation.landscapeRight));

      verify(CameraPlatform.instance.lockCaptureOrientation(
              cameraController.cameraId, DeviceOrientation.portraitUp))
          .called(1);
      verify(CameraPlatform.instance.lockCaptureOrientation(
              cameraController.cameraId, DeviceOrientation.landscapeRight))
          .called(1);
    });

    test(
        'lockCaptureOrientation() throws $CameraException on $PlatformException',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();
      when(CameraPlatform.instance.lockCaptureOrientation(
              cameraController.cameraId, DeviceOrientation.portraitUp))
          .thenThrow(
        PlatformException(
          code: 'TEST_ERROR',
          message: 'This is a test error message',
          details: null,
        ),
      );

      expect(
          cameraController.lockCaptureOrientation(DeviceOrientation.portraitUp),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'TEST_ERROR',
            'This is a test error message',
          )));
    });

    test('unlockCaptureOrientation() calls $CameraPlatform', () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();

      await cameraController.unlockCaptureOrientation();
      expect(cameraController.value.lockedCaptureOrientation, equals(null));

      verify(CameraPlatform.instance
              .unlockCaptureOrientation(cameraController.cameraId))
          .called(1);
    });

    test(
        'unlockCaptureOrientation() throws $CameraException on $PlatformException',
        () async {
      CameraController cameraController = CameraController(
          CameraDescription(
              name: 'cam',
              lensDirection: CameraLensDirection.back,
              sensorOrientation: 90),
          ResolutionPreset.max);
      await cameraController.initialize();
      when(CameraPlatform.instance
              .unlockCaptureOrientation(cameraController.cameraId))
          .thenThrow(
        PlatformException(
          code: 'TEST_ERROR',
          message: 'This is a test error message',
          details: null,
        ),
      );

      expect(
          cameraController.unlockCaptureOrientation(),
          throwsA(isA<CameraException>().having(
            (error) => error.description,
            'TEST_ERROR',
            'This is a test error message',
          )));
    });
  });
}

class MockCameraPlatform extends Mock
    with MockPlatformInterfaceMixin
    implements CameraPlatform {
  @override
  Future<void> initializeCamera(
    int? cameraId, {
    ImageFormatGroup? imageFormatGroup = ImageFormatGroup.unknown,
  }) async =>
      super.noSuchMethod(Invocation.method(
        #initializeCamera,
        [cameraId],
        {
          #imageFormatGroup: imageFormatGroup,
        },
      ));

  @override
  Future<void> dispose(int? cameraId) async {
    return super.noSuchMethod(Invocation.method(#dispose, [cameraId]));
  }

  @override
  Future<List<CameraDescription>> availableCameras() =>
      Future.value(mockAvailableCameras);

  @override
  Future<int> createCamera(
    CameraDescription description,
    ResolutionPreset? resolutionPreset, {
    bool enableAudio = false,
  }) =>
      mockPlatformException
          ? throw PlatformException(code: 'foo', message: 'bar')
          : Future.value(mockInitializeCamera);

  @override
  Stream<CameraInitializedEvent> onCameraInitialized(int cameraId) =>
      Stream.value(mockOnCameraInitializedEvent);

  @override
  Stream<CameraClosingEvent> onCameraClosing(int cameraId) =>
      Stream.value(mockOnCameraClosingEvent);

  @override
  Stream<CameraErrorEvent> onCameraError(int cameraId) =>
      Stream.value(mockOnCameraErrorEvent);

  @override
  Stream<DeviceOrientationChangedEvent> onDeviceOrientationChanged() =>
      Stream.value(mockOnDeviceOrientationChangedEvent);

  @override
  Future<XFile> takePicture(int cameraId) => mockPlatformException
      ? throw PlatformException(code: 'foo', message: 'bar')
      : Future.value(mockTakePicture);

  @override
  Future<void> prepareForVideoRecording() async =>
      super.noSuchMethod(Invocation.method(#prepareForVideoRecording, null));

  @override
  Future<XFile> startVideoRecording(int cameraId,
          {Duration? maxVideoDuration}) =>
      Future.value(mockVideoRecordingXFile);

  @override
  Future<void> lockCaptureOrientation(
          int? cameraId, DeviceOrientation? orientation) async =>
      super.noSuchMethod(
          Invocation.method(#lockCaptureOrientation, [cameraId, orientation]));

  @override
  Future<void> unlockCaptureOrientation(int? cameraId) async => super
      .noSuchMethod(Invocation.method(#unlockCaptureOrientation, [cameraId]));

  @override
  Future<void> pausePreview(int? cameraId) async =>
      super.noSuchMethod(Invocation.method(#pausePreview, [cameraId]));

  @override
  Future<void> resumePreview(int? cameraId) async =>
      super.noSuchMethod(Invocation.method(#resumePreview, [cameraId]));

  @override
  Future<double> getMaxZoomLevel(int? cameraId) async => super.noSuchMethod(
        Invocation.method(#getMaxZoomLevel, [cameraId]),
        returnValue: 1.0,
      );

  @override
  Future<double> getMinZoomLevel(int? cameraId) async => super.noSuchMethod(
        Invocation.method(#getMinZoomLevel, [cameraId]),
        returnValue: 0.0,
      );

  @override
  Future<void> setZoomLevel(int? cameraId, double? zoom) async =>
      super.noSuchMethod(Invocation.method(#setZoomLevel, [cameraId, zoom]));

  @override
  Future<void> setFlashMode(int? cameraId, FlashMode? mode) async =>
      super.noSuchMethod(Invocation.method(#setFlashMode, [cameraId, mode]));

  @override
  Future<void> setExposureMode(int? cameraId, ExposureMode? mode) async =>
      super.noSuchMethod(Invocation.method(#setExposureMode, [cameraId, mode]));

  @override
  Future<void> setExposurePoint(int? cameraId, Point<double>? point) async =>
      super.noSuchMethod(
          Invocation.method(#setExposurePoint, [cameraId, point]));

  @override
  Future<double> getMinExposureOffset(int? cameraId) async =>
      super.noSuchMethod(
        Invocation.method(#getMinExposureOffset, [cameraId]),
        returnValue: 0.0,
      );

  @override
  Future<double> getMaxExposureOffset(int? cameraId) async =>
      super.noSuchMethod(
        Invocation.method(#getMaxExposureOffset, [cameraId]),
        returnValue: 1.0,
      );

  @override
  Future<double> getExposureOffsetStepSize(int? cameraId) async =>
      super.noSuchMethod(
        Invocation.method(#getExposureOffsetStepSize, [cameraId]),
        returnValue: 1.0,
      );

  @override
  Future<double> setExposureOffset(int? cameraId, double? offset) async =>
      super.noSuchMethod(
        Invocation.method(#setExposureOffset, [cameraId, offset]),
        returnValue: 1.0,
      );
}

class MockCameraDescription extends CameraDescription {
  /// Creates a new camera description with the given properties.
  MockCameraDescription()
      : super(
          name: 'Test',
          lensDirection: CameraLensDirection.back,
          sensorOrientation: 0,
        );

  @override
  CameraLensDirection get lensDirection => CameraLensDirection.back;

  @override
  String get name => 'back';
}