namespace Yw.WpfUI.Hydro
{
    /// <summary>
    /// 抽象相机辅助类
    /// </summary>
    internal class LogicalCameraHelper
    {
        /// <summary>
        /// 
        /// </summary>
        public LogicalCameraHelper(HelixViewport3D viewport)
        {
            _viewport = viewport;
        }

        /// <summary>
        /// 保存默认相机事件
        /// </summary>
        public event Action<LogicalCamera3D> SaveDefaultCameraEvent;

        private readonly HelixViewport3D _viewport = null;//三维组件
        private LogicalCamera3D _defaultCamera = null;//默认相机设置

        /// <summary>
        /// 设置默认相机
        /// </summary>
        public void SetDefault(CameraL3d camera)
        {
            if (camera == null)
            {
                return;
            }
            _defaultCamera = camera.ToLogicalCamera3D();
        }

        /// <summary>
        /// 保存默认相机
        /// </summary>
        public void SaveDefault()
        {
            var cameraSetting = new CameraSetting(_viewport.Camera);
            var logicalCamera = new LogicalCamera3D(cameraSetting);
            _defaultCamera = logicalCamera;
            this.SaveDefaultCameraEvent?.Invoke(logicalCamera);
        }

        /// <summary>
        /// 获取默认相机
        /// </summary>
        /// <returns></returns>
        public LogicalCamera3D GetDefault()
        {
            return _defaultCamera;
        }

        /// <summary>
        /// 应用默认相机
        /// </summary>
        public void ApplyDefault()
        {
            if (_defaultCamera == null)
            {
                return;
            }
            var camera = _viewport.Camera;
            camera.NearPlaneDistance = _defaultCamera.NearPlaneDistance;
            camera.FarPlaneDistance = _defaultCamera.FarPlaneDistance;
            camera.Position = _defaultCamera.Position;
            camera.LookDirection = _defaultCamera.LookDirection;
            camera.UpDirection = _defaultCamera.UpDirection;
            if (camera is PerspectiveCamera perspectiveCamera)
            {
                perspectiveCamera.FieldOfView = _defaultCamera.FieldOfView;
            }
            else if (camera is OrthographicCamera orghographicCamera)
            {
                orghographicCamera.Width = _defaultCamera.Width;
            }
        }

    }
}