using UnityEditor;

namespace Unity.Cinemachine.Editor
{
    [CustomEditor(typeof(CinemachineHardLookAt))]
    [CanEditMultipleObjects]
    class CinemachineHardLookAtEditor : CinemachineComponentBaseEditor
    {
        CinemachineHardLookAt Target => target as CinemachineHardLookAt;

        protected virtual void OnEnable()
        {
            CinemachineDebug.OnGUIHandlers -= OnGuiHandler;
            CinemachineDebug.OnGUIHandlers += OnGuiHandler;
            if (CinemachineCorePrefs.ShowInGameGuides.Value)
                InspectorUtility.RepaintGameView();
   
            CinemachineSceneToolUtility.RegisterTool(typeof(TrackedObjectOffsetTool));
        }

        protected virtual void OnDisable()
        {
            CinemachineDebug.OnGUIHandlers -= OnGuiHandler;
            if (CinemachineCorePrefs.ShowInGameGuides.Value)
                InspectorUtility.RepaintGameView();
  
            CinemachineSceneToolUtility.UnregisterTool(typeof(TrackedObjectOffsetTool));
        }

        protected virtual void OnGuiHandler(CinemachineBrain brain)
        {
            // Draw the camera guides
            if (Target == null || !CinemachineCorePrefs.ShowInGameGuides.Value || !Target.isActiveAndEnabled)
                return;

            // Don't draw the guides if rendering to texture
            if (brain == null || brain.OutputCamera == null
                    || (brain.OutputCamera.activeTexture != null && CinemachineBrain.ActiveBrainCount > 1))
                return;

            var vcam = Target.VirtualCamera;
            if (!brain.IsValidChannel(vcam))
                return;

            bool isLive = targets.Length <= 1 && brain.IsLiveChild(vcam, true);
            var t = Target.LookAtTarget;
            if (Target.LookAtTarget != null && isLive)
            {
                var point = t.position + t.rotation * Target.LookAtOffset;
                CmPipelineComponentInspectorUtility.OnGUI_DrawOnscreenTargetMarker(
                    point, brain.OutputCamera);
            }
        }

        void OnSceneGUI()
        {
            if (Target == null || !Target.IsValid)
                return;

            if (CinemachineSceneToolUtility.IsToolActive(typeof(TrackedObjectOffsetTool)))
            {
                CinemachineSceneToolHelpers.TrackedObjectOffsetTool(
                    Target.VirtualCamera, 
                    new SerializedObject(Target).FindProperty(() => Target.LookAtOffset),
                    CinemachineCore.Stage.Aim);
            }
        }
    }
}