// ReSharper disable once FunctionComplexityOverflow
        public override void OnInspectorGUI()
        {
            EditorGUI.indentLevel = 0;
            var isDirty = false;

            _variation = (SoundGroupVariation)target;

            if (MasterAudioInspectorResources.LogoTexture != null)
            {
                DTGUIHelper.ShowHeaderTexture(MasterAudioInspectorResources.LogoTexture);
            }

            var parentGroup = _variation.ParentGroup;

            if (parentGroup == null)
            {
                DTGUIHelper.ShowLargeBarAlert("This file cannot be edited in Project View.");
                return;
            }

            var         isVideoPlayersGroup = DTGUIHelper.IsVideoPlayersGroup(_variation.ParentGroup.name);
            AudioSource previewer;

            EditorGUILayout.BeginHorizontal(EditorStyles.toolbar);
            GUI.contentColor = DTGUIHelper.BrightButtonColor;
            if (GUILayout.Button(new GUIContent("Back to Group", "Select Group in Hierarchy"), EditorStyles.toolbarButton, GUILayout.Width(90)))
            {
                Selection.activeObject = _variation.transform.parent.gameObject;
            }
            GUILayout.FlexibleSpace();

            if (Application.isPlaying)
            {
                if (isVideoPlayersGroup && DTMonoHelper.IsActive(_variation.gameObject))
                {
                    GUI.color = Color.green;
                    var label = "Playing";
                    EditorGUILayout.LabelField(label,
                                               EditorStyles.miniButtonMid, GUILayout.Height(16), GUILayout.Width(240));
                }
                else if (_variation.IsPlaying && _variation.VarAudio.clip != null)
                {
                    // wait for Resource files to load
                    GUI.color = Color.green;

                    var label = "Playing ({0}%)";

                    if (_variation.IsPaused)
                    {
                        GUI.color = Color.yellow;
                        label     = "Paused ({0}%)";
                    }

                    var percentagePlayed = (int)(_variation.VarAudio.time / _variation.VarAudio.clip.length * 100);

                    EditorGUILayout.LabelField(string.Format(label, percentagePlayed),
                                               EditorStyles.miniButtonMid, GUILayout.Height(16), GUILayout.Width(240));

                    _variation.frames++;
                    isDirty = true;

                    GUI.color = DTGUIHelper.BrightButtonColor;
                    if (_variation.ObjectToFollow != null || _variation.ObjectToTriggerFrom != null)
                    {
                        if (GUILayout.Button("Select Caller", EditorStyles.toolbarButton, GUILayout.Width(80)))
                        {
                            if (_variation.ObjectToFollow != null)
                            {
                                Selection.activeGameObject = _variation.ObjectToFollow.gameObject;
                            }
                            else
                            {
                                Selection.activeGameObject = _variation.ObjectToTriggerFrom.gameObject;
                            }
                        }
                    }
                }
                else
                {
                    GUI.color = Color.red;
                    EditorGUILayout.LabelField("Not playing", EditorStyles.miniButtonMid, GUILayout.Height(16), GUILayout.Width(240));
                }
            }

            GUI.color        = Color.white;
            GUI.contentColor = Color.white;

            _ma = MasterAudio.Instance;
            var maInScene = _ma != null;

            if (maInScene)
            {
                var buttonPressed = DTGUIHelper.AddVariationButtons();

                switch (buttonPressed)
                {
                case DTGUIHelper.DTFunctionButtons.Play:
                    if (DTGUIHelper.IsVideoPlayersGroup(_variation.ParentGroup.name))
                    {
                        break;
                    }

                    previewer = MasterAudioInspector.GetPreviewer();

                    if (Application.isPlaying)
                    {
                        MasterAudio.PlaySound3DAtVector3AndForget(_variation.ParentGroup.name, previewer.transform.position, 1f, null, 0f, _variation.name);
                    }
                    else
                    {
                        isDirty = true;

                        var randPitch = GetRandomPreviewPitch(_variation);
                        var varVol    = GetRandomPreviewVolume(_variation);

                        if (previewer != null)
                        {
                            MasterAudioInspector.StopPreviewer();
                            previewer.pitch = randPitch;
                        }

                        var calcVolume = varVol * parentGroup.groupMasterVolume;

                        switch (_variation.audLocation)
                        {
                        case MasterAudio.AudioLocation.ResourceFile:
                            if (previewer != null)
                            {
                                var fileName = AudioResourceOptimizer.GetLocalizedFileName(_variation.useLocalization, _variation.resourceFileName);
                                previewer.PlayOneShot(Resources.Load(fileName) as AudioClip, calcVolume);
                            }
                            break;

                        case MasterAudio.AudioLocation.Clip:
                            if (previewer != null)
                            {
                                previewer.PlayOneShot(_variation.VarAudio.clip, calcVolume);
                            }
                            break;

#if ADDRESSABLES_ENABLED
                        case MasterAudio.AudioLocation.Addressable:
                            DTGUIHelper.PreviewAddressable(_variation.audioClipAddressable, previewer, calcVolume);
                            break;
#endif
                        }
                    }
                    break;

                case DTGUIHelper.DTFunctionButtons.Stop:
                    if (DTGUIHelper.IsVideoPlayersGroup(_variation.ParentGroup.name))
                    {
                        break;
                    }

                    if (Application.isPlaying)
                    {
                        MasterAudio.StopAllOfSound(_variation.transform.parent.name);
                    }
                    else
                    {
                        MasterAudioInspector.StopPreviewer();
                    }
                    break;
                }
            }

            EditorGUILayout.EndHorizontal();

            DTGUIHelper.HelpHeader("http://www.dtdevtools.com/docs/masteraudio/SoundGroupVariations.htm", "http://www.dtdevtools.com/API/masteraudio/class_dark_tonic_1_1_master_audio_1_1_sound_group_variation.html");

            if (!isVideoPlayersGroup)
            {
                if (maInScene && !Application.isPlaying)
                {
                    DTGUIHelper.ShowColorWarning(MasterAudio.PreviewText);
                }

                if (!Application.isPlaying)
                {
                    var newAlias = EditorGUILayout.TextField("Clip Id (optional)", _variation.clipAlias);

                    if (newAlias != _variation.clipAlias)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Clip Id");
                        _variation.clipAlias = newAlias;
                    }
                }

                var oldLocation = _variation.audLocation;
                EditorGUILayout.BeginHorizontal();
                if (!Application.isPlaying)
                {
                    var newLocation =
                        (MasterAudio.AudioLocation)EditorGUILayout.EnumPopup("Audio Origin", _variation.audLocation);

                    if (newLocation != oldLocation)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Audio Origin");
                        _variation.audLocation = newLocation;
                    }
                }
                else
                {
                    EditorGUILayout.LabelField("Audio Origin", _variation.audLocation.ToString());
                }
                DTGUIHelper.AddHelpIconNoStyle("http://www.dtdevtools.com/docs/masteraudio/SoundGroupVariations.htm#AudioOrigin");
                EditorGUILayout.EndHorizontal();

                if (oldLocation != _variation.audLocation && oldLocation == MasterAudio.AudioLocation.Clip)
                {
                    if (_variation.VarAudio.clip != null)
                    {
                        Debug.Log("Audio clip removed to prevent unnecessary memory usage.");
                    }
                    _variation.VarAudio.clip = null;
                }

                switch (_variation.audLocation)
                {
                case MasterAudio.AudioLocation.Clip:
                    var newClip = (AudioClip)EditorGUILayout.ObjectField("Audio Clip", _variation.VarAudio.clip, typeof(AudioClip), false);

                    if (newClip != _variation.VarAudio.clip)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation.VarAudio, "assign Audio Clip");
                        _variation.VarAudio.clip = newClip;
                    }
                    break;

#if ADDRESSABLES_ENABLED
                case MasterAudio.AudioLocation.Addressable:
                    serializedObject.Update();
                    EditorGUILayout.PropertyField(serializedObject.FindProperty(nameof(SoundGroupVariation.audioClipAddressable)), true);
                    serializedObject.ApplyModifiedProperties();

                    if (!DTGUIHelper.IsAddressableTypeValid(_variation.audioClipAddressable, _variation.name))
                    {
                        _variation.audioClipAddressable = null;
                        isDirty = true;
                    }
                    break;
#endif
                case MasterAudio.AudioLocation.ResourceFile:
                    EditorGUILayout.BeginVertical();
                    var anEvent = Event.current;

                    GUI.color = DTGUIHelper.DragAreaColor;
                    var dragArea = GUILayoutUtility.GetRect(0f, 20f, GUILayout.ExpandWidth(true));
                    GUI.Box(dragArea, "Drag Resource Audio clip here to use its name!");
                    GUI.color = Color.white;

                    string newFilename;

                    switch (anEvent.type)
                    {
                    case EventType.DragUpdated:
                    case EventType.DragPerform:
                        if (!dragArea.Contains(anEvent.mousePosition))
                        {
                            break;
                        }

                        DragAndDrop.visualMode = DragAndDropVisualMode.Copy;

                        if (anEvent.type == EventType.DragPerform)
                        {
                            DragAndDrop.AcceptDrag();

                            foreach (var dragged in DragAndDrop.objectReferences)
                            {
                                // ReSharper disable once ExpressionIsAlwaysNull
                                var aClip = dragged as AudioClip;
                                // ReSharper disable once ConditionIsAlwaysTrueOrFalse
                                if (aClip == null)
                                {
                                    continue;
                                }

                                // ReSharper disable HeuristicUnreachableCode
                                var useLocalization = false;
                                newFilename = DTGUIHelper.GetResourcePath(aClip, ref useLocalization);
                                if (string.IsNullOrEmpty(newFilename))
                                {
                                    newFilename = aClip.name;
                                }

                                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Resource filename");
                                _variation.resourceFileName = newFilename;
                                _variation.useLocalization  = useLocalization;
                                break;
                                // ReSharper restore HeuristicUnreachableCode
                            }
                        }
                        Event.current.Use();
                        break;
                    }
                    EditorGUILayout.EndVertical();

                    newFilename = EditorGUILayout.TextField("Resource Filename", _variation.resourceFileName);
                    if (newFilename != _variation.resourceFileName)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Resource filename");
                        _variation.resourceFileName = newFilename;
                    }

                    EditorGUI.indentLevel = 1;

                    var newLocal = EditorGUILayout.Toggle("Use Localized Folder", _variation.useLocalization);
                    if (newLocal != _variation.useLocalization)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Localized Folder");
                        _variation.useLocalization = newLocal;
                    }

                    break;
                }

                EditorGUI.indentLevel = 0;

                var newProbability = EditorGUILayout.IntSlider("Probability to Play (%)", _variation.probabilityToPlay, 0, 100);
                if (newProbability != _variation.probabilityToPlay)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Probability to Play (%)");
                    _variation.probabilityToPlay = newProbability;
                }

                if (_variation.probabilityToPlay < 100)
                {
                    DTGUIHelper.ShowLargeBarAlert("Since Probability to Play is less than 100%, you will not always hear this Variation when it's selected to play.");
                }
            }

            var newVolume = DTGUIHelper.DisplayVolumeField(_variation.VarAudio.volume, DTGUIHelper.VolumeFieldType.None, MasterAudio.MixerWidthMode.Normal, 0f, true);
            if (newVolume != _variation.VarAudio.volume)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation.VarAudio, "change Volume");
                _variation.VarAudio.volume = newVolume;
            }

            if (isVideoPlayersGroup)
            {
                DTGUIHelper.ShowColorWarning("This is the specially named Sound Group for Video Players. Most controls for this Sound Group cannot be used for Video Players and are hidden.");
            }

            if (!isVideoPlayersGroup)
            {
                var newPitch = DTGUIHelper.DisplayPitchField(_variation.VarAudio.pitch);
                if (newPitch != _variation.VarAudio.pitch)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation.VarAudio, "change Pitch");
                    _variation.VarAudio.pitch = newPitch;
                }

                if (parentGroup.curVariationMode == MasterAudioGroup.VariationMode.LoopedChain)
                {
                    DTGUIHelper.ShowLargeBarAlert(MasterAudio.LoopDisabledLoopedChain);
                }
                else if (_variation.useRandomStartTime && _variation.randomEndPercent != 100f)
                {
                    DTGUIHelper.ShowLargeBarAlert(MasterAudio.LoopDisabledCustomEnd);
                }
                else
                {
                    var newLoop = EditorGUILayout.Toggle("Loop Clip", _variation.VarAudio.loop);
                    if (newLoop != _variation.VarAudio.loop)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation.VarAudio, "toggle Loop");
                        _variation.VarAudio.loop = newLoop;
                    }
                }

                EditorGUILayout.BeginHorizontal();
                var newWeight = EditorGUILayout.IntSlider("Voices (Weight)", _variation.weight, 0, 100);
                DTGUIHelper.AddHelpIconNoStyle("http://www.dtdevtools.com/docs/masteraudio/SoundGroupVariations.htm#Voices");
                EditorGUILayout.EndHorizontal();
                if (newWeight != _variation.weight)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Voices (Weight)");
                    _variation.weight = newWeight;
                }

                DTGUIHelper.StartGroupHeader();
                var newUseRndPitch = EditorGUILayout.BeginToggleGroup(" Use Random Pitch", _variation.useRandomPitch);
                if (newUseRndPitch != _variation.useRandomPitch)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Random Pitch");
                    _variation.useRandomPitch = newUseRndPitch;
                }

                DTGUIHelper.EndGroupHeader();

                if (_variation.useRandomPitch)
                {
                    var newMode = (SoundGroupVariation.RandomPitchMode)EditorGUILayout.EnumPopup("Pitch Compute Mode", _variation.randomPitchMode);
                    if (newMode != _variation.randomPitchMode)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Pitch Compute Mode");
                        _variation.randomPitchMode = newMode;
                    }

                    var newPitchMin = DTGUIHelper.DisplayPitchField(_variation.randomPitchMin, "Random Pitch Min");
                    if (newPitchMin != _variation.randomPitchMin)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Random Pitch Min");
                        _variation.randomPitchMin = newPitchMin;
                        if (_variation.randomPitchMax <= _variation.randomPitchMin)
                        {
                            _variation.randomPitchMax = _variation.randomPitchMin;
                        }
                    }

                    var newPitchMax = DTGUIHelper.DisplayPitchField(_variation.randomPitchMax, "Random Pitch Max");
                    if (newPitchMax != _variation.randomPitchMax)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Random Pitch Max");
                        _variation.randomPitchMax = newPitchMax;
                        if (_variation.randomPitchMin > _variation.randomPitchMax)
                        {
                            _variation.randomPitchMin = _variation.randomPitchMax;
                        }
                    }
                }

                EditorGUILayout.EndToggleGroup();

                DTGUIHelper.StartGroupHeader();

                var newUseRndVol = EditorGUILayout.BeginToggleGroup(" Use Random Volume", _variation.useRandomVolume);
                if (newUseRndVol != _variation.useRandomVolume)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Random Volume");
                    _variation.useRandomVolume = newUseRndVol;
                }

                DTGUIHelper.EndGroupHeader();

                if (_variation.useRandomVolume)
                {
                    var newMode = (SoundGroupVariation.RandomVolumeMode)EditorGUILayout.EnumPopup("Volume Compute Mode", _variation.randomVolumeMode);
                    if (newMode != _variation.randomVolumeMode)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Volume Compute Mode");
                        _variation.randomVolumeMode = newMode;
                    }

                    var volMin = 0f;
                    if (_variation.randomVolumeMode == SoundGroupVariation.RandomVolumeMode.AddToClipVolume)
                    {
                        volMin = -1f;
                    }

                    var newVolMin = DTGUIHelper.DisplayVolumeField(_variation.randomVolumeMin, DTGUIHelper.VolumeFieldType.None, MasterAudio.MixerWidthMode.Normal, volMin, true, "Random Volume Min");
                    if (newVolMin != _variation.randomVolumeMin)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Random Volume Min");
                        _variation.randomVolumeMin = newVolMin;
                        if (_variation.randomVolumeMax <= _variation.randomVolumeMin)
                        {
                            _variation.randomVolumeMax = _variation.randomVolumeMin;
                        }
                    }

                    var newVolMax = DTGUIHelper.DisplayVolumeField(_variation.randomVolumeMax, DTGUIHelper.VolumeFieldType.None, MasterAudio.MixerWidthMode.Normal, volMin, true, "Random Volume Max");
                    if (newVolMax != _variation.randomVolumeMax)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Random Volume Max");
                        _variation.randomVolumeMax = newVolMax;
                        if (_variation.randomVolumeMin > _variation.randomVolumeMax)
                        {
                            _variation.randomVolumeMin = _variation.randomVolumeMax;
                        }
                    }
                }

                EditorGUILayout.EndToggleGroup();

                DTGUIHelper.StartGroupHeader();

                var newSilence = EditorGUILayout.BeginToggleGroup(" Use Random Delay", _variation.useIntroSilence);
                if (newSilence != _variation.useIntroSilence)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Random Delay");
                    _variation.useIntroSilence = newSilence;
                }
                DTGUIHelper.EndGroupHeader();

                if (_variation.useIntroSilence)
                {
                    var newSilenceMin = EditorGUILayout.Slider("Delay Min (sec)", _variation.introSilenceMin, 0f, 100f);
                    if (newSilenceMin != _variation.introSilenceMin)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Delay Min (sec)");
                        _variation.introSilenceMin = newSilenceMin;
                        if (_variation.introSilenceMin > _variation.introSilenceMax)
                        {
                            _variation.introSilenceMax = newSilenceMin;
                        }
                    }

                    var newSilenceMax = EditorGUILayout.Slider("Delay Max (sec)", _variation.introSilenceMax, 0f, 100f);
                    if (newSilenceMax != _variation.introSilenceMax)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Delay Max (sec)");
                        _variation.introSilenceMax = newSilenceMax;
                        if (_variation.introSilenceMax < _variation.introSilenceMin)
                        {
                            _variation.introSilenceMin = newSilenceMax;
                        }
                    }
                }

                EditorGUILayout.EndToggleGroup();

                DTGUIHelper.StartGroupHeader();

                var newStart = EditorGUILayout.BeginToggleGroup(" Use Custom Start/End Position", _variation.useRandomStartTime);
                if (newStart != _variation.useRandomStartTime)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Custom Start/End Position");
                    _variation.useRandomStartTime = newStart;
                }
                DTGUIHelper.EndGroupHeader();

                if (_variation.useRandomStartTime)
                {
                    var newMin = EditorGUILayout.Slider("Start Min (%)", _variation.randomStartMinPercent, 0f, 100f);
                    if (newMin != _variation.randomStartMinPercent)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Start Min (%)");
                        _variation.randomStartMinPercent = newMin;
                        if (_variation.randomStartMaxPercent <= _variation.randomStartMinPercent)
                        {
                            _variation.randomStartMaxPercent = _variation.randomStartMinPercent;
                        }
                    }

                    var newMax = EditorGUILayout.Slider("Start Max (%)", _variation.randomStartMaxPercent, 0f, 100f);
                    if (newMax != _variation.randomStartMaxPercent)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Start Max (%)");
                        _variation.randomStartMaxPercent = newMax;
                        if (_variation.randomStartMinPercent > _variation.randomStartMaxPercent)
                        {
                            _variation.randomStartMinPercent = _variation.randomStartMaxPercent;
                        }
                    }

                    var newEnd = EditorGUILayout.Slider("End (%)", _variation.randomEndPercent, 0f, 100f);
                    if (newEnd != _variation.randomEndPercent || _variation.randomEndPercent < _variation.randomStartMaxPercent)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change End (%)");
                        _variation.randomEndPercent = newEnd;
                        if (_variation.randomEndPercent < _variation.randomStartMaxPercent)
                        {
                            _variation.randomEndPercent = _variation.randomStartMaxPercent;
                        }
                    }
                }

                EditorGUILayout.EndToggleGroup();

                if (_variation.VarAudio.loop)
                {
                    DTGUIHelper.StartGroupHeader();

                    newStart = EditorGUILayout.BeginToggleGroup(" Use Finite Looping", _variation.useCustomLooping);
                    if (newStart != _variation.useCustomLooping)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation,
                                                                    "toggle Use Finite Looping");
                        _variation.useCustomLooping = newStart;
                    }
                    DTGUIHelper.EndGroupHeader();

                    if (_variation.useCustomLooping)
                    {
                        var newMin = EditorGUILayout.IntSlider("Min Loops", _variation.minCustomLoops, 1, 100);
                        if (newMin != _variation.minCustomLoops)
                        {
                            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Min Loops");
                            _variation.minCustomLoops = newMin;
                            if (_variation.maxCustomLoops <= _variation.minCustomLoops)
                            {
                                _variation.maxCustomLoops = _variation.minCustomLoops;
                            }
                        }

                        var newMax = EditorGUILayout.IntSlider("Max Loops", _variation.maxCustomLoops, 1, 100);
                        if (newMax != _variation.maxCustomLoops)
                        {
                            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Max Loops");
                            _variation.maxCustomLoops = newMax;
                            if (_variation.minCustomLoops > _variation.maxCustomLoops)
                            {
                                _variation.minCustomLoops = _variation.maxCustomLoops;
                            }
                        }
                    }

                    EditorGUILayout.EndToggleGroup();
                }

                DTGUIHelper.StartGroupHeader();
                var newUseFades = EditorGUILayout.BeginToggleGroup(" Use Custom Fading", _variation.useFades);
                if (newUseFades != _variation.useFades)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Custom Fading");
                    _variation.useFades = newUseFades;
                }
                DTGUIHelper.EndGroupHeader();

                if (_variation.useFades)
                {
                    var newFadeIn = EditorGUILayout.Slider("Fade In Time (sec)", _variation.fadeInTime, 0f, 10f);
                    if (newFadeIn != _variation.fadeInTime)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Fade In Time");
                        _variation.fadeInTime = newFadeIn;
                    }

                    var newFadeOut = EditorGUILayout.Slider("Fade Out time (sec)", _variation.fadeOutTime, 0f, 10f);
                    if (newFadeOut != _variation.fadeOutTime)
                    {
                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Fade Out Time");
                        _variation.fadeOutTime = newFadeOut;
                    }

                    if (_variation.VarAudio.loop)
                    {
                        DTGUIHelper.ShowColorWarning("Looped clips will not automatically use the custom fade out. You will need to call FadeOutNowAndStop() on the Variation to use the fade.");
                    }
                }

                EditorGUILayout.EndToggleGroup();
            }

            if (GUI.changed || isDirty)
            {
                EditorUtility.SetDirty(target);
            }

            //DrawDefaultInspector();
        }
    // ReSharper disable once FunctionComplexityOverflow
    public override void OnInspectorGUI()
    {
        EditorGUI.indentLevel = 0;
        var isDirty = false;

        _variation = (SoundGroupVariation)target;

        if (MasterAudioInspectorResources.LogoTexture != null)
        {
            DTGUIHelper.ShowHeaderTexture(MasterAudioInspectorResources.LogoTexture);
        }

        var parentGroup = _variation.ParentGroup;

        if (parentGroup == null)
        {
            DTGUIHelper.ShowLargeBarAlert("This file cannot be edited in Project View.");
            return;
        }

        AudioSource previewer;

        EditorGUILayout.BeginHorizontal(EditorStyles.toolbar);
        GUI.contentColor = DTGUIHelper.BrightButtonColor;
        if (GUILayout.Button(new GUIContent("Back to Group", "Select Group in Hierarchy"), EditorStyles.toolbarButton, GUILayout.Width(90)))
        {
            Selection.activeObject = _variation.transform.parent.gameObject;
        }
        GUILayout.FlexibleSpace();

        if (Application.isPlaying)
        {
            // ReSharper disable once ConvertIfStatementToConditionalTernaryExpression
            if (_variation.IsPlaying && _variation.VarAudio.clip != null)   // wait for Resource files to load
            {
                GUI.color = Color.green;

                var label = "Playing ({0}%)";

                if (AudioUtil.IsAudioPaused(_variation.VarAudio))
                {
                    GUI.color = Color.yellow;
                    label     = "Paused ({0}%)";
                }

                var percentagePlayed = (int)(_variation.VarAudio.time / _variation.VarAudio.clip.length * 100);

                EditorGUILayout.LabelField(string.Format(label, percentagePlayed),
                                           EditorStyles.miniButtonMid, GUILayout.Height(16), GUILayout.Width(240));

                _variation.frames++;
                isDirty = true;

                GUI.color = DTGUIHelper.BrightButtonColor;
                if (_variation.ObjectToFollow != null || _variation.ObjectToTriggerFrom != null)
                {
                    if (GUILayout.Button("Select Caller", EditorStyles.miniButton, GUILayout.Width(80)))
                    {
                        if (_variation.ObjectToFollow != null)
                        {
                            Selection.activeGameObject = _variation.ObjectToFollow.gameObject;
                        }
                        else
                        {
                            Selection.activeGameObject = _variation.ObjectToTriggerFrom.gameObject;
                        }
                    }
                }
            }
            else
            {
                GUI.color = Color.red;
                EditorGUILayout.LabelField("Not playing", EditorStyles.miniButtonMid, GUILayout.Height(16), GUILayout.Width(240));
            }
        }

        GUI.color        = Color.white;
        GUI.contentColor = Color.white;

        _ma = MasterAudio.Instance;
        var maInScene = _ma != null;

        var canPreview = !DTGUIHelper.IsPrefabInProjectView(_variation);

        if (maInScene)
        {
            var buttonPressed = DTGUIHelper.DTFunctionButtons.None;
            if (canPreview)
            {
                buttonPressed = DTGUIHelper.AddVariationButtons();
            }

            switch (buttonPressed)
            {
            case DTGUIHelper.DTFunctionButtons.Play:
                previewer = MasterAudioInspector.GetPreviewer();

                if (Application.isPlaying)
                {
                    MasterAudio.PlaySound3DAtVector3AndForget(_variation.ParentGroup.name, previewer.transform.position, 1f, null, 0f, _variation.name);
                }
                else
                {
                    isDirty = true;

                    var randPitch = GetRandomPreviewPitch(_variation);
                    var varVol    = GetRandomPreviewVolume(_variation);

                    if (_variation.audLocation != MasterAudio.AudioLocation.FileOnInternet)
                    {
                        if (previewer != null)
                        {
                            MasterAudioInspector.StopPreviewer();
                            previewer.pitch = randPitch;
                        }
                    }

                    var calcVolume = varVol * parentGroup.groupMasterVolume;

                    switch (_variation.audLocation)
                    {
                    case MasterAudio.AudioLocation.ResourceFile:
                        if (previewer != null)
                        {
                            var fileName = AudioResourceOptimizer.GetLocalizedFileName(_variation.useLocalization, _variation.resourceFileName);
                            previewer.PlayOneShot(Resources.Load(fileName) as AudioClip, calcVolume);
                        }
                        break;

                    case MasterAudio.AudioLocation.Clip:
                        if (previewer != null)
                        {
                            previewer.PlayOneShot(_variation.VarAudio.clip, calcVolume);
                        }
                        break;

                    case MasterAudio.AudioLocation.FileOnInternet:
                        if (!string.IsNullOrEmpty(_variation.internetFileUrl))
                        {
                            Application.OpenURL(_variation.internetFileUrl);
                        }
                        break;
                    }
                }
                break;

            case DTGUIHelper.DTFunctionButtons.Stop:
                if (Application.isPlaying)
                {
                    MasterAudio.StopAllOfSound(_variation.transform.parent.name);
                }
                else
                {
                    if (_variation.audLocation != MasterAudio.AudioLocation.FileOnInternet)
                    {
                        MasterAudioInspector.StopPreviewer();
                    }
                }
                break;
            }
        }

        EditorGUILayout.EndHorizontal();

        DTGUIHelper.HelpHeader("http://www.dtdevtools.com/docs/masteraudio/SoundGroupVariations.htm", "http://www.dtdevtools.com/API/masteraudio/class_dark_tonic_1_1_master_audio_1_1_sound_group_variation.html");

        if (maInScene && !Application.isPlaying)
        {
            DTGUIHelper.ShowColorWarning(MasterAudio.PreviewText);
        }

        var oldLocation = _variation.audLocation;

        EditorGUILayout.BeginHorizontal();
        if (!Application.isPlaying)
        {
            var newLocation =
                (MasterAudio.AudioLocation)EditorGUILayout.EnumPopup("Audio Origin", _variation.audLocation);

            if (newLocation != oldLocation)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Audio Origin");
                _variation.audLocation = newLocation;
            }
        }
        else
        {
            EditorGUILayout.LabelField("Audio Origin", _variation.audLocation.ToString());
        }
        DTGUIHelper.AddHelpIcon("http://www.dtdevtools.com/docs/masteraudio/SoundGroupVariations.htm#AudioOrigin");
        EditorGUILayout.EndHorizontal();

        switch (_variation.audLocation)
        {
        case MasterAudio.AudioLocation.Clip:
            var newClip = (AudioClip)EditorGUILayout.ObjectField("Audio Clip", _variation.VarAudio.clip, typeof(AudioClip), false);

            if (newClip != _variation.VarAudio.clip)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation.VarAudio, "assign Audio Clip");
                _variation.VarAudio.clip = newClip;
            }
            break;

        case MasterAudio.AudioLocation.FileOnInternet:
            if (oldLocation != _variation.audLocation)
            {
                if (_variation.VarAudio.clip != null)
                {
                    Debug.Log("Audio clip removed to prevent unnecessary memory usage on File On Internet Variation.");
                }
                _variation.VarAudio.clip = null;
            }

            if (!Application.isPlaying)
            {
                var newUrl = EditorGUILayout.TextField("Internet File URL", _variation.internetFileUrl);
                if (newUrl != _variation.internetFileUrl)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Internet File URL");
                    _variation.internetFileUrl = newUrl;
                }
            }
            else
            {
                EditorGUILayout.LabelField("Internet File URL", _variation.internetFileUrl);
                switch (_variation.internetFileLoadStatus)
                {
                case MasterAudio.InternetFileLoadStatus.Loading:
                    DTGUIHelper.ShowLargeBarAlert("Attempting to download.");
                    break;

                case MasterAudio.InternetFileLoadStatus.Loaded:
                    DTGUIHelper.ShowColorWarning("Downloaded and ready to play.");
                    break;

                case MasterAudio.InternetFileLoadStatus.Failed:
                    DTGUIHelper.ShowRedError("Failed Download.");
                    break;
                }
            }

            if (string.IsNullOrEmpty(_variation.internetFileUrl))
            {
                DTGUIHelper.ShowLargeBarAlert("You have not specified a URL for the File On Internet. This Variation will not be available to play without one.");
            }
            break;

        case MasterAudio.AudioLocation.ResourceFile:
            if (oldLocation != _variation.audLocation)
            {
                if (_variation.VarAudio.clip != null)
                {
                    Debug.Log("Audio clip removed to prevent unnecessary memory usage on Resource file Variation.");
                }
                _variation.VarAudio.clip = null;
            }

            EditorGUILayout.BeginVertical();
            var anEvent = Event.current;

            GUI.color = DTGUIHelper.DragAreaColor;
            var dragArea = GUILayoutUtility.GetRect(0f, 20f, GUILayout.ExpandWidth(true));
            GUI.Box(dragArea, "Drag Resource Audio clip here to use its name!");
            GUI.color = Color.white;

            string newFilename;

            switch (anEvent.type)
            {
            case EventType.DragUpdated:
            case EventType.DragPerform:
                if (!dragArea.Contains(anEvent.mousePosition))
                {
                    break;
                }

                DragAndDrop.visualMode = DragAndDropVisualMode.Copy;

                if (anEvent.type == EventType.DragPerform)
                {
                    DragAndDrop.AcceptDrag();

                    foreach (var dragged in DragAndDrop.objectReferences)
                    {
                        // ReSharper disable once ExpressionIsAlwaysNull
                        var aClip = dragged as AudioClip;
                        // ReSharper disable once ConditionIsAlwaysTrueOrFalse
                        if (aClip == null)
                        {
                            continue;
                        }

                        // ReSharper disable HeuristicUnreachableCode
                        var useLocalization = false;
                        newFilename = DTGUIHelper.GetResourcePath(aClip, ref useLocalization);
                        if (string.IsNullOrEmpty(newFilename))
                        {
                            newFilename = aClip.name;
                        }

                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Resource filename");
                        _variation.resourceFileName = newFilename;
                        _variation.useLocalization  = useLocalization;
                        break;
                        // ReSharper restore HeuristicUnreachableCode
                    }
                }
                Event.current.Use();
                break;
            }
            EditorGUILayout.EndVertical();

            newFilename = EditorGUILayout.TextField("Resource Filename", _variation.resourceFileName);
            if (newFilename != _variation.resourceFileName)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Resource filename");
                _variation.resourceFileName = newFilename;
            }

            EditorGUI.indentLevel = 1;

            var newLocal = EditorGUILayout.Toggle("Use Localized Folder", _variation.useLocalization);
            if (newLocal != _variation.useLocalization)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Localized Folder");
                _variation.useLocalization = newLocal;
            }

            break;
        }

        EditorGUI.indentLevel = 0;

        var newProbability = EditorGUILayout.IntSlider("Probability to Play (%)", _variation.probabilityToPlay, 0, 100);

        if (newProbability != _variation.probabilityToPlay)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Probability to Play (%)");
            _variation.probabilityToPlay = newProbability;
        }

        if (_variation.probabilityToPlay < 100)
        {
            DTGUIHelper.ShowLargeBarAlert("Since Probability to Play is less than 100%, you will not always hear this Variation when it's selected to play.");
        }

        var newVolume = DTGUIHelper.DisplayVolumeField(_variation.VarAudio.volume, DTGUIHelper.VolumeFieldType.None, MasterAudio.MixerWidthMode.Normal, 0f, true);

        if (newVolume != _variation.VarAudio.volume)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation.VarAudio, "change Volume");
            _variation.VarAudio.volume = newVolume;
        }

        var newPitch = DTGUIHelper.DisplayPitchField(_variation.VarAudio.pitch);

        if (newPitch != _variation.VarAudio.pitch)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation.VarAudio, "change Pitch");
            _variation.VarAudio.pitch = newPitch;
        }

        if (parentGroup.curVariationMode == MasterAudioGroup.VariationMode.LoopedChain)
        {
            DTGUIHelper.ShowLargeBarAlert("Loop Clip is always OFF for Looped Chain Groups");
        }
        else
        {
            var newLoop = EditorGUILayout.Toggle("Loop Clip", _variation.VarAudio.loop);
            if (newLoop != _variation.VarAudio.loop)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation.VarAudio, "toggle Loop");
                _variation.VarAudio.loop = newLoop;
            }
        }

        EditorGUILayout.BeginHorizontal();
        var newWeight = EditorGUILayout.IntSlider("Voices (Weight)", _variation.weight, 0, 100);

        DTGUIHelper.AddHelpIcon("http://www.dtdevtools.com/docs/masteraudio/SoundGroupVariations.htm#Voices");
        EditorGUILayout.EndHorizontal();
        if (newWeight != _variation.weight)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Voices (Weight)");
            _variation.weight = newWeight;
        }

        var newFxTailTime = EditorGUILayout.Slider("FX Tail Time", _variation.fxTailTime, 0f, 10f);

        if (newFxTailTime != _variation.fxTailTime)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change FX Tail Time");
            _variation.fxTailTime = newFxTailTime;
        }

        var filterList = new List <string>()
        {
            MasterAudio.NoGroupName,
            "Low Pass",
            "High Pass",
            "Distortion",
            "Chorus",
            "Echo",
            "Reverb"
        };

        EditorGUILayout.BeginHorizontal();

        var newFilterIndex = EditorGUILayout.Popup("Add Filter Effect", 0, filterList.ToArray());

        DTGUIHelper.AddHelpIcon("http://www.dtdevtools.com/docs/masteraudio/FilterFX.htm");
        EditorGUILayout.EndHorizontal();

        switch (newFilterIndex)
        {
        case 1:
            AddFilterComponent(typeof(AudioLowPassFilter));
            break;

        case 2:
            AddFilterComponent(typeof(AudioHighPassFilter));
            break;

        case 3:
            AddFilterComponent(typeof(AudioDistortionFilter));
            break;

        case 4:
            AddFilterComponent(typeof(AudioChorusFilter));
            break;

        case 5:
            AddFilterComponent(typeof(AudioEchoFilter));
            break;

        case 6:
            AddFilterComponent(typeof(AudioReverbFilter));
            break;
        }

        DTGUIHelper.StartGroupHeader();
        var newUseRndPitch = EditorGUILayout.BeginToggleGroup(" Use Random Pitch", _variation.useRandomPitch);

        if (newUseRndPitch != _variation.useRandomPitch)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Random Pitch");
            _variation.useRandomPitch = newUseRndPitch;
        }

        DTGUIHelper.EndGroupHeader();

        if (_variation.useRandomPitch)
        {
            var newMode = (SoundGroupVariation.RandomPitchMode)EditorGUILayout.EnumPopup("Pitch Compute Mode", _variation.randomPitchMode);
            if (newMode != _variation.randomPitchMode)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Pitch Compute Mode");
                _variation.randomPitchMode = newMode;
            }

            var newPitchMin = DTGUIHelper.DisplayPitchField(_variation.randomPitchMin, "Random Pitch Min");
            if (newPitchMin != _variation.randomPitchMin)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Random Pitch Min");
                _variation.randomPitchMin = newPitchMin;
                if (_variation.randomPitchMax <= _variation.randomPitchMin)
                {
                    _variation.randomPitchMax = _variation.randomPitchMin;
                }
            }

            var newPitchMax = DTGUIHelper.DisplayPitchField(_variation.randomPitchMax, "Random Pitch Max");
            if (newPitchMax != _variation.randomPitchMax)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Random Pitch Max");
                _variation.randomPitchMax = newPitchMax;
                if (_variation.randomPitchMin > _variation.randomPitchMax)
                {
                    _variation.randomPitchMin = _variation.randomPitchMax;
                }
            }
        }

        EditorGUILayout.EndToggleGroup();
        DTGUIHelper.AddSpaceForNonU5(2);

        DTGUIHelper.StartGroupHeader();

        var newUseRndVol = EditorGUILayout.BeginToggleGroup(" Use Random Volume", _variation.useRandomVolume);

        if (newUseRndVol != _variation.useRandomVolume)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Random Volume");
            _variation.useRandomVolume = newUseRndVol;
        }

        DTGUIHelper.EndGroupHeader();

        if (_variation.useRandomVolume)
        {
            var newMode = (SoundGroupVariation.RandomVolumeMode)EditorGUILayout.EnumPopup("Volume Compute Mode", _variation.randomVolumeMode);
            if (newMode != _variation.randomVolumeMode)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Volume Compute Mode");
                _variation.randomVolumeMode = newMode;
            }

            var volMin = 0f;
            if (_variation.randomVolumeMode == SoundGroupVariation.RandomVolumeMode.AddToClipVolume)
            {
                volMin = -1f;
            }

            var newVolMin = DTGUIHelper.DisplayVolumeField(_variation.randomVolumeMin, DTGUIHelper.VolumeFieldType.None, MasterAudio.MixerWidthMode.Normal, volMin, true, "Random Volume Min");
            if (newVolMin != _variation.randomVolumeMin)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Random Volume Min");
                _variation.randomVolumeMin = newVolMin;
                if (_variation.randomVolumeMax <= _variation.randomVolumeMin)
                {
                    _variation.randomVolumeMax = _variation.randomVolumeMin;
                }
            }

            var newVolMax = DTGUIHelper.DisplayVolumeField(_variation.randomVolumeMax, DTGUIHelper.VolumeFieldType.None, MasterAudio.MixerWidthMode.Normal, volMin, true, "Random Volume Max");
            if (newVolMax != _variation.randomVolumeMax)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Random Volume Max");
                _variation.randomVolumeMax = newVolMax;
                if (_variation.randomVolumeMin > _variation.randomVolumeMax)
                {
                    _variation.randomVolumeMin = _variation.randomVolumeMax;
                }
            }
        }

        EditorGUILayout.EndToggleGroup();
        DTGUIHelper.AddSpaceForNonU5(2);

        DTGUIHelper.StartGroupHeader();

        var newSilence = EditorGUILayout.BeginToggleGroup(" Use Random Delay", _variation.useIntroSilence);

        if (newSilence != _variation.useIntroSilence)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Random Delay");
            _variation.useIntroSilence = newSilence;
        }
        DTGUIHelper.EndGroupHeader();

        if (_variation.useIntroSilence)
        {
            var newSilenceMin = EditorGUILayout.Slider("Delay Min (sec)", _variation.introSilenceMin, 0f, 100f);
            if (newSilenceMin != _variation.introSilenceMin)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Delay Min (sec)");
                _variation.introSilenceMin = newSilenceMin;
                if (_variation.introSilenceMin > _variation.introSilenceMax)
                {
                    _variation.introSilenceMax = newSilenceMin;
                }
            }

            var newSilenceMax = EditorGUILayout.Slider("Delay Max (sec)", _variation.introSilenceMax, 0f, 100f);
            if (newSilenceMax != _variation.introSilenceMax)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Delay Max (sec)");
                _variation.introSilenceMax = newSilenceMax;
                if (_variation.introSilenceMax < _variation.introSilenceMin)
                {
                    _variation.introSilenceMin = newSilenceMax;
                }
            }
        }

        EditorGUILayout.EndToggleGroup();
        DTGUIHelper.AddSpaceForNonU5(2);

        DTGUIHelper.StartGroupHeader();

        var newStart = EditorGUILayout.BeginToggleGroup(" Use Random Start Position", _variation.useRandomStartTime);

        if (newStart != _variation.useRandomStartTime)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Random Start Position");
            _variation.useRandomStartTime = newStart;
        }
        DTGUIHelper.EndGroupHeader();

        if (_variation.useRandomStartTime)
        {
            var newMin = EditorGUILayout.Slider("Start Min (%)", _variation.randomStartMinPercent, 0f, 100f);
            if (newMin != _variation.randomStartMinPercent)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Start Min (%)");
                _variation.randomStartMinPercent = newMin;
                if (_variation.randomStartMaxPercent <= _variation.randomStartMinPercent)
                {
                    _variation.randomStartMaxPercent = _variation.randomStartMinPercent;
                }
            }

            var newMax = EditorGUILayout.Slider("Start Max (%)", _variation.randomStartMaxPercent, 0f, 100f);
            if (newMax != _variation.randomStartMaxPercent)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Start Max (%)");
                _variation.randomStartMaxPercent = newMax;
                if (_variation.randomStartMinPercent > _variation.randomStartMaxPercent)
                {
                    _variation.randomStartMinPercent = _variation.randomStartMaxPercent;
                }
            }
        }

        EditorGUILayout.EndToggleGroup();
        DTGUIHelper.AddSpaceForNonU5(2);

        DTGUIHelper.StartGroupHeader();
        var newUseFades = EditorGUILayout.BeginToggleGroup(" Use Custom Fading", _variation.useFades);

        if (newUseFades != _variation.useFades)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Custom Fading");
            _variation.useFades = newUseFades;
        }
        DTGUIHelper.EndGroupHeader();

        if (_variation.useFades)
        {
            var newFadeIn = EditorGUILayout.Slider("Fade In Time (sec)", _variation.fadeInTime, 0f, 10f);
            if (newFadeIn != _variation.fadeInTime)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Fade In Time");
                _variation.fadeInTime = newFadeIn;
            }

            if (_variation.VarAudio.loop)
            {
                DTGUIHelper.ShowColorWarning("Looped clips cannot have a custom fade out.");
            }
            else
            {
                var newFadeOut = EditorGUILayout.Slider("Fade Out time (sec)", _variation.fadeOutTime, 0f, 10f);
                if (newFadeOut != _variation.fadeOutTime)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Fade Out Time");
                    _variation.fadeOutTime = newFadeOut;
                }
            }
        }

        EditorGUILayout.EndToggleGroup();

        if (GUI.changed || isDirty)
        {
            EditorUtility.SetDirty(target);
        }

        //DrawDefaultInspector();
    }
    // ReSharper disable once FunctionComplexityOverflow
    public override void OnInspectorGUI()
    {
        EditorGUI.indentLevel = 1;
        var isDirty = false;

        _variation = (DynamicGroupVariation)target;

        if (MasterAudioInspectorResources.LogoTexture != null)
        {
            DTGUIHelper.ShowHeaderTexture(MasterAudioInspectorResources.LogoTexture);
        }

        EditorGUI.indentLevel = 0;  // Space will handle this for the header
        var        previewLang = SystemLanguage.English;
        GameObject dgscGO      = null;

        if (_variation.transform.parent != null && _variation.transform.parent.parent != null)
        {
            var parentParent = _variation.transform.parent.parent;

            dgscGO = parentParent.gameObject;

            var dgsc = dgscGO.GetComponent <DynamicSoundGroupCreator>();
            if (dgsc != null)
            {
                previewLang = dgsc.previewLanguage;
            }
        }

        if (dgscGO == null)
        {
            DTGUIHelper.ShowRedError("This prefab must have a GameObject 2 parents up. Prefab broken.");
            return;
        }

        AudioSource previewer;

        EditorGUILayout.BeginHorizontal(EditorStyles.toolbar);
        GUI.contentColor = DTGUIHelper.BrightButtonColor;
        if (GUILayout.Button(new GUIContent("Back to Group", "Select Group in Hierarchy"), EditorStyles.toolbarButton, GUILayout.Width(120)))
        {
            // ReSharper disable once PossibleNullReferenceException
            Selection.activeObject = _variation.transform.parent.gameObject;
        }
        GUILayout.FlexibleSpace();
        GUI.contentColor = Color.white;

        var buttonPressed = DTGUIHelper.AddDynamicVariationButtons();

        switch (buttonPressed)
        {
        case DTGUIHelper.DTFunctionButtons.Play:
            isDirty = true;

            previewer = MasterAudioInspector.GetPreviewer();

            var randPitch = SoundGroupVariationInspector.GetRandomPreviewPitch(_variation);
            var varVol    = SoundGroupVariationInspector.GetRandomPreviewVolume(_variation);

            if (_variation.audLocation != MasterAudio.AudioLocation.FileOnInternet)
            {
                if (previewer != null)
                {
                    MasterAudioInspector.StopPreviewer();
                    previewer.pitch = randPitch;
                }
            }

            var calcVolume = varVol * _variation.ParentGroup.groupMasterVolume;

            switch (_variation.audLocation)
            {
            case MasterAudio.AudioLocation.ResourceFile:
                var fileName = AudioResourceOptimizer.GetLocalizedDynamicSoundGroupFileName(previewLang, _variation.useLocalization, _variation.resourceFileName);

                var clip = Resources.Load(fileName) as AudioClip;
                if (clip != null)
                {
                    if (previewer != null)
                    {
                        previewer.PlayOneShot(clip, calcVolume);
                    }
                }
                else
                {
                    DTGUIHelper.ShowAlert("Could not find Resource file: " + fileName);
                }
                break;

            case MasterAudio.AudioLocation.Clip:
                if (previewer != null)
                {
                    previewer.PlayOneShot(_variation.VarAudio.clip, calcVolume);
                }
                break;

            case MasterAudio.AudioLocation.FileOnInternet:
                if (!string.IsNullOrEmpty(_variation.internetFileUrl))
                {
                    Application.OpenURL(_variation.internetFileUrl);
                }
                break;
            }

            break;

        case DTGUIHelper.DTFunctionButtons.Stop:
            if (_variation.audLocation != MasterAudio.AudioLocation.FileOnInternet)
            {
                MasterAudioInspector.StopPreviewer();
            }
            break;
        }

        EditorGUILayout.EndHorizontal();

        DTGUIHelper.HelpHeader("http://www.dtdevtools.com/docs/masteraudio/SoundGroupVariations.htm");

        if (!Application.isPlaying)
        {
            DTGUIHelper.ShowColorWarning(MasterAudio.PreviewText);
        }

        var oldLocation = _variation.audLocation;

        EditorGUILayout.BeginHorizontal();
        var newLocation = (MasterAudio.AudioLocation)EditorGUILayout.EnumPopup("Audio Origin", _variation.audLocation);

        DTGUIHelper.AddHelpIcon("http://www.dtdevtools.com/docs/masteraudio/SoundGroupVariations.htm#AudioOrigin");
        EditorGUILayout.EndHorizontal();

        if (newLocation != oldLocation)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Audio Origin");
            _variation.audLocation = newLocation;
        }

        switch (_variation.audLocation)
        {
        case MasterAudio.AudioLocation.Clip:
            var newClip = (AudioClip)EditorGUILayout.ObjectField("Audio Clip", _variation.VarAudio.clip, typeof(AudioClip), false);

            if (newClip != _variation.VarAudio.clip)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation.VarAudio, "assign Audio Clip");
                _variation.VarAudio.clip = newClip;
            }
            break;

        case MasterAudio.AudioLocation.FileOnInternet:
            if (oldLocation != _variation.audLocation)
            {
                if (_variation.VarAudio.clip != null)
                {
                    Debug.Log("Audio clip removed to prevent unnecessary memory usage on File On Internet Variation.");
                }
                _variation.VarAudio.clip = null;
            }

            if (!Application.isPlaying)
            {
                var newUrl = EditorGUILayout.TextField("Internet File URL", _variation.internetFileUrl);
                if (newUrl != _variation.internetFileUrl)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Internet File URL");
                    _variation.internetFileUrl = newUrl;
                }
            }

            if (string.IsNullOrEmpty(_variation.internetFileUrl))
            {
                DTGUIHelper.ShowLargeBarAlert("You have not specified a URL for the File On Internet. This Variation will not be available to play without one.");
            }
            break;

        case MasterAudio.AudioLocation.ResourceFile:
            if (oldLocation != _variation.audLocation)
            {
                if (_variation.VarAudio.clip != null)
                {
                    Debug.Log("Audio clip removed to prevent unnecessary memory usage on Resource file Variation.");
                }
                _variation.VarAudio.clip = null;
            }

            EditorGUILayout.BeginVertical();
            var anEvent = Event.current;

            GUI.color = DTGUIHelper.DragAreaColor;
            var dragArea = GUILayoutUtility.GetRect(0f, 20f, GUILayout.ExpandWidth(true));
            GUI.Box(dragArea, "Drag Resource Audio clip here to use its name!");
            GUI.color = Color.white;

            string newFilename;

            switch (anEvent.type)
            {
            case EventType.DragUpdated:
            case EventType.DragPerform:
                if (!dragArea.Contains(anEvent.mousePosition))
                {
                    break;
                }

                DragAndDrop.visualMode = DragAndDropVisualMode.Copy;

                if (anEvent.type == EventType.DragPerform)
                {
                    DragAndDrop.AcceptDrag();

                    foreach (var dragged in DragAndDrop.objectReferences)
                    {
                        var aClip = dragged as AudioClip;
                        if (aClip == null)
                        {
                            continue;
                        }

                        AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Resource filename");

                        var useLocalization = false;
                        newFilename = DTGUIHelper.GetResourcePath(aClip, ref useLocalization);
                        if (string.IsNullOrEmpty(newFilename))
                        {
                            newFilename = aClip.name;
                        }

                        _variation.resourceFileName = newFilename;
                        _variation.useLocalization  = useLocalization;
                        break;
                    }
                }
                Event.current.Use();
                break;
            }
            EditorGUILayout.EndVertical();

            newFilename = EditorGUILayout.TextField("Resource Filename", _variation.resourceFileName);
            if (newFilename != _variation.resourceFileName)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Resource filename");
                _variation.resourceFileName = newFilename;
            }

            EditorGUI.indentLevel = 1;

            var newLocal = EditorGUILayout.Toggle("Use Localized Folder", _variation.useLocalization);
            if (newLocal != _variation.useLocalization)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Localized Folder");
                _variation.useLocalization = newLocal;
            }

            break;
        }

        EditorGUI.indentLevel = 0;

        var newProbability = EditorGUILayout.IntSlider("Probability to Play (%)", _variation.probabilityToPlay, 0, 100);

        if (newProbability != _variation.probabilityToPlay)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Probability to Play (%)");
            _variation.probabilityToPlay = newProbability;
        }

        if (_variation.probabilityToPlay < 100)
        {
            DTGUIHelper.ShowLargeBarAlert("Since Probability to Play is less than 100%, you will not always hear this Variation when it's selected to play.");
        }

        var newVolume = EditorGUILayout.Slider("Volume", _variation.VarAudio.volume, 0f, 1f);

        if (newVolume != _variation.VarAudio.volume)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation.VarAudio, "change Volume");
            _variation.VarAudio.volume = newVolume;
        }

        var newPitch = DTGUIHelper.DisplayPitchField(_variation.VarAudio.pitch);

        if (newPitch != _variation.VarAudio.pitch)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation.VarAudio, "change Pitch");
            _variation.VarAudio.pitch = newPitch;
        }

        if (_variation.ParentGroup.curVariationMode == MasterAudioGroup.VariationMode.LoopedChain)
        {
            DTGUIHelper.ShowLargeBarAlert(MasterAudio.LoopDisabledLoopedChain);
        }
        else if (_variation.useRandomStartTime && _variation.randomEndPercent != 100f)
        {
            DTGUIHelper.ShowLargeBarAlert(MasterAudio.LoopDisabledCustomEnd);
        }
        else
        {
            var newLoop = EditorGUILayout.Toggle("Loop Clip", _variation.VarAudio.loop);
            if (newLoop != _variation.VarAudio.loop)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation.VarAudio, "toggle Loop");
                _variation.VarAudio.loop = newLoop;
            }
        }

        EditorGUILayout.BeginHorizontal();
        var newWeight = EditorGUILayout.IntSlider("Voices (Weight)", _variation.weight, 0, 100);

        DTGUIHelper.AddHelpIcon("http://www.dtdevtools.com/docs/masteraudio/SoundGroupVariations.htm#Voices");
        EditorGUILayout.EndHorizontal();
        if (newWeight != _variation.weight)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Voices (Weight)");
            _variation.weight = newWeight;
        }


        DTGUIHelper.StartGroupHeader();

        var newUseRndPitch = EditorGUILayout.BeginToggleGroup(" Use Random Pitch", _variation.useRandomPitch);

        if (newUseRndPitch != _variation.useRandomPitch)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Random Pitch");
            _variation.useRandomPitch = newUseRndPitch;
        }
        DTGUIHelper.EndGroupHeader();

        if (_variation.useRandomPitch)
        {
            var newMode = (SoundGroupVariation.RandomPitchMode)EditorGUILayout.EnumPopup("Pitch Compute Mode", _variation.randomPitchMode);
            if (newMode != _variation.randomPitchMode)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Pitch Compute Mode");
                _variation.randomPitchMode = newMode;
            }

            var newPitchMin = DTGUIHelper.DisplayPitchField(_variation.randomPitchMin, "Random Pitch Min");
            if (newPitchMin != _variation.randomPitchMin)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Random Pitch Min");
                _variation.randomPitchMin = newPitchMin;
                if (_variation.randomPitchMax <= _variation.randomPitchMin)
                {
                    _variation.randomPitchMax = _variation.randomPitchMin;
                }
            }

            var newPitchMax = DTGUIHelper.DisplayPitchField(_variation.randomPitchMax, "Random Pitch Max");
            if (newPitchMax != _variation.randomPitchMax)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Random Pitch Max");
                _variation.randomPitchMax = newPitchMax;
                if (_variation.randomPitchMin > _variation.randomPitchMax)
                {
                    _variation.randomPitchMin = _variation.randomPitchMax;
                }
            }
        }

        EditorGUILayout.EndToggleGroup();
        DTGUIHelper.AddSpaceForNonU5(2);

        DTGUIHelper.StartGroupHeader();

        var newUseRndVol = EditorGUILayout.BeginToggleGroup(" Use Random Volume", _variation.useRandomVolume);

        if (newUseRndVol != _variation.useRandomVolume)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Random Volume");
            _variation.useRandomVolume = newUseRndVol;
        }
        DTGUIHelper.EndGroupHeader();

        if (_variation.useRandomVolume)
        {
            var newMode = (SoundGroupVariation.RandomVolumeMode)EditorGUILayout.EnumPopup("Volume Compute Mode", _variation.randomVolumeMode);
            if (newMode != _variation.randomVolumeMode)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Volume Compute Mode");
                _variation.randomVolumeMode = newMode;
            }

            var volMin = 0f;
            if (_variation.randomVolumeMode == SoundGroupVariation.RandomVolumeMode.AddToClipVolume)
            {
                volMin = -1f;
            }

            var newVolMin = DTGUIHelper.DisplayVolumeField(_variation.randomVolumeMin, DTGUIHelper.VolumeFieldType.None, MasterAudio.MixerWidthMode.Normal, volMin, true, "Random Volume Min");
            if (newVolMin != _variation.randomVolumeMin)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Random Volume Min");
                _variation.randomVolumeMin = newVolMin;
                if (_variation.randomVolumeMax <= _variation.randomVolumeMin)
                {
                    _variation.randomVolumeMax = _variation.randomVolumeMin;
                }
            }

            var newVolMax = DTGUIHelper.DisplayVolumeField(_variation.randomVolumeMax, DTGUIHelper.VolumeFieldType.None, MasterAudio.MixerWidthMode.Normal, volMin, true, "Random Volume Max");
            if (newVolMax != _variation.randomVolumeMax)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Random Volume Max");
                _variation.randomVolumeMax = newVolMax;
                if (_variation.randomVolumeMin > _variation.randomVolumeMax)
                {
                    _variation.randomVolumeMin = _variation.randomVolumeMax;
                }
            }
        }

        EditorGUILayout.EndToggleGroup();
        DTGUIHelper.AddSpaceForNonU5(2);

        DTGUIHelper.StartGroupHeader();

        var newSilence = EditorGUILayout.BeginToggleGroup(" Use Random Delay", _variation.useIntroSilence);

        if (newSilence != _variation.useIntroSilence)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Random Delay");
            _variation.useIntroSilence = newSilence;
        }
        DTGUIHelper.EndGroupHeader();

        if (_variation.useIntroSilence)
        {
            var newSilenceMin = EditorGUILayout.Slider("Delay Min (sec)", _variation.introSilenceMin, 0f, 100f);
            if (newSilenceMin != _variation.introSilenceMin)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Delay Min (sec)");
                _variation.introSilenceMin = newSilenceMin;
                if (_variation.introSilenceMin > _variation.introSilenceMax)
                {
                    _variation.introSilenceMax = newSilenceMin;
                }
            }

            var newSilenceMax = EditorGUILayout.Slider("Delay Max (sec)", _variation.introSilenceMax, 0f, 100f);
            if (newSilenceMax != _variation.introSilenceMax)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Delay Max (sec)");
                _variation.introSilenceMax = newSilenceMax;
                if (_variation.introSilenceMax < _variation.introSilenceMin)
                {
                    _variation.introSilenceMin = newSilenceMax;
                }
            }
        }
        EditorGUILayout.EndToggleGroup();
        DTGUIHelper.AddSpaceForNonU5(2);

        DTGUIHelper.StartGroupHeader();

        var newStart = EditorGUILayout.BeginToggleGroup(" Use Custom Start/End Position", _variation.useRandomStartTime);

        if (newStart != _variation.useRandomStartTime)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Custom Start/End Position");
            _variation.useRandomStartTime = newStart;
        }
        DTGUIHelper.EndGroupHeader();

        if (_variation.useRandomStartTime)
        {
            var newMin = EditorGUILayout.Slider("Start Min (%)", _variation.randomStartMinPercent, 0f, 100f);
            if (newMin != _variation.randomStartMinPercent)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Start Min (%)");
                _variation.randomStartMinPercent = newMin;
                if (_variation.randomStartMaxPercent <= _variation.randomStartMinPercent)
                {
                    _variation.randomStartMaxPercent = _variation.randomStartMinPercent;
                }
            }

            var newMax = EditorGUILayout.Slider("Start Max (%)", _variation.randomStartMaxPercent, 0f, 100f);
            if (newMax != _variation.randomStartMaxPercent)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Start Max (%)");
                _variation.randomStartMaxPercent = newMax;
                if (_variation.randomStartMinPercent > _variation.randomStartMaxPercent)
                {
                    _variation.randomStartMinPercent = _variation.randomStartMaxPercent;
                }
            }

            var newEnd = EditorGUILayout.Slider("End (%)", _variation.randomEndPercent, 0f, 100f);
            if (newEnd != _variation.randomEndPercent || _variation.randomEndPercent < _variation.randomStartMaxPercent)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change End (%)");
                _variation.randomEndPercent = newEnd;
                if (_variation.randomEndPercent < _variation.randomStartMaxPercent)
                {
                    _variation.randomEndPercent = _variation.randomStartMaxPercent;
                }
            }
        }

        EditorGUILayout.EndToggleGroup();
        DTGUIHelper.AddSpaceForNonU5(2);

        if (_variation.VarAudio.loop)
        {
            DTGUIHelper.StartGroupHeader();

            newStart = EditorGUILayout.BeginToggleGroup(" Use Finite Looping", _variation.useCustomLooping);
            if (newStart != _variation.useCustomLooping)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation,
                                                            "toggle Use Finite Looping");
                _variation.useCustomLooping = newStart;
            }
            DTGUIHelper.EndGroupHeader();

            if (_variation.useCustomLooping)
            {
                var newMin = EditorGUILayout.IntSlider("Min Loops", _variation.minCustomLoops, 1, 100);
                if (newMin != _variation.minCustomLoops)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Min Loops");
                    _variation.minCustomLoops = newMin;
                    if (_variation.maxCustomLoops <= _variation.minCustomLoops)
                    {
                        _variation.maxCustomLoops = _variation.minCustomLoops;
                    }
                }

                var newMax = EditorGUILayout.IntSlider("Max Loops", _variation.maxCustomLoops, 1, 100);
                if (newMax != _variation.maxCustomLoops)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Max Loops");
                    _variation.maxCustomLoops = newMax;
                    if (_variation.minCustomLoops > _variation.maxCustomLoops)
                    {
                        _variation.minCustomLoops = _variation.maxCustomLoops;
                    }
                }
            }

            EditorGUILayout.EndToggleGroup();
            DTGUIHelper.AddSpaceForNonU5(2);
        }

        DTGUIHelper.StartGroupHeader();

        var newUseFades = EditorGUILayout.BeginToggleGroup(" Use Custom Fading", _variation.useFades);

        if (newUseFades != _variation.useFades)
        {
            AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "toggle Use Custom Fading");
            _variation.useFades = newUseFades;
        }
        DTGUIHelper.EndGroupHeader();

        if (_variation.useFades)
        {
            var newFadeIn = EditorGUILayout.Slider("Fade In Time (sec)", _variation.fadeInTime, 0f, 10f);
            if (newFadeIn != _variation.fadeInTime)
            {
                AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Fade In Time");
                _variation.fadeInTime = newFadeIn;
            }

            if (_variation.VarAudio.loop)
            {
                DTGUIHelper.ShowColorWarning("Looped clips cannot have a custom fade out.");
            }
            else
            {
                var newFadeOut = EditorGUILayout.Slider("Fade Out time (sec)", _variation.fadeOutTime, 0f, 10f);
                if (newFadeOut != _variation.fadeOutTime)
                {
                    AudioUndoHelper.RecordObjectPropertyForUndo(ref isDirty, _variation, "change Fade Out Time");
                    _variation.fadeOutTime = newFadeOut;
                }
            }
        }

        EditorGUILayout.EndToggleGroup();

        if (GUI.changed || isDirty)
        {
            EditorUtility.SetDirty(target);
        }

        //DrawDefaultInspector();
    }