import { mat4 } from 'gl-matrix';
import { vtkObject } from './../../interfaces';
import { RGBColor, Vector3 } from './../../types';

export enum LIGHT_TYPES {
  'HeadLight',
  'CameraLight',
  'SceneLight',
}

export interface ILightInitialValues {
  switch?: boolean;
  intensity?: number;
  color?: RGBColor;
  position?: Vector3;
  focalPoint?: Vector3;
  positional?: boolean;
  exponent?: number;
  coneAngle?: number;
  coneFalloff?: number;
  attenuationValues?: number[];
  lightType?: LIGHT_TYPES;
  shadowAttenuation?: number;
  direction?: Vector3;
  directionMTime?: number;
}

export interface vtkLight extends vtkObject {
  /**
   *
   */
  getAttenuationValues(): number[];

  /**
   *
   */
  getAttenuationValuesByReference(): number[];

  /**
   * Get the color of the light.
   */
  getColor(): RGBColor;

  /**
   * Get the color of the light.
   */
  getColorByReference(): RGBColor;

  /**
   * Get the lighting cone angle of a positional light in degrees.
   * This is the angle between the axis of the cone and a ray along the edge
   * of the cone. A value of 90 (or more) indicates that you want no spot
   * lighting effects just a positional light.
   */
  getConeAngle(): number;

  /**
   * Get the lighting falloff angle of a positional light in degrees.
   * This is the angle that sets how much the cone will be extended to
   * smooth the border. A value of 0 indicates that the spot light will
   * have a completely sharp edge (this does not mean completely sharp
   * lighting, just that the border will be sharp).
   */
  getConeFalloff(): number;

  /**
   * Set the position and focal point of a light based on elevation and azimuth.
   * The light is moved so it is shining from the given angle. Angles are
   * given in degrees. If the light is a positional light, it is made
   * directional instead.
   */
  getDirection(): Vector3;

  /**
   * Get the exponent of the cosine used in positional lighting.
   */
  getExponent(): number;

  /**
   * Get the focal point.
   */
  getFocalPoint(): Vector3;

  /**
   * Get the focal point.
   */
  getFocalPointByReference(): Vector3;

  /**
   * Get the brightness of the light
   */
  getIntensity(): number;

  /**
   * Get the type of the light.
   */
  getLightType(): string;

  /**
   * Get the position of the light.
   */
  getPosition(): Vector3;

  /**
   * Get the position of the light.
   */
  getPositionByReference(): Vector3;

  /**
   * Get if positional lighting is on or off.
   */
  getPositional(): boolean;

  /**
   * Get the position of the light, modified by the transformation matrix (if
   * it exists).
   */
  getTransformedPosition(): Vector3;

  /**
   * Get the focal point of the light, modified by the transformation matrix
   * (if it exists).
   */
  getTransformedFocalPoint(): Vector3;

  /**
   * Set the quadratic attenuation constants.
   * @param {Number} a
   * @param {Number} b
   * @param {Number} c
   */
  setAttenuationValues(a: number, b: number, c: number): boolean;

  /**
   * Set the quadratic attenuation constants from an array.
   * @param {Number[]} attenuationValues The quadratic attenuation.
   */
  setAttenuationValuesFrom(attenuationValues: number[]): boolean;

  /**
   * Set the color of the object. Has the side effect of setting the
   * ambient diffuse and specular colors as well. This is basically
   * a quick overall color setting method.
   * @param {Number} r Defines the red component (between 0 and 1).
   * @param {Number} g Defines the green component (between 0 and 1).
   * @param {Number} b Defines the blue component (between 0 and 1).
   */
  setColor(r: number, g: number, b: number): boolean;

  /**
   * Set the color of the object. Has the side effect of setting the
   * ambient diffuse and specular colors as well. This is basically
   * a quick overall color setting method.
   * @param {RGBColor} color Defines the RGB color array..
   */
  setColor(color: RGBColor): boolean;

  /**
   * Set the color of the object. Has the side effect of setting the
   * ambient diffuse and specular colors as well. This is basically
   * a quick overall color setting method.
   * @param {Number} r Defines the red component (between 0 and 1).
   * @param {Number} g Defines the green component (between 0 and 1).
   * @param {Number} b Defines the blue component (between 0 and 1).
   */
  setColorFrom(r: number, g: number, b: number): boolean;

  /**
   * Set the color of the object. Has the side effect of setting the
   * ambient diffuse and specular colors as well. This is basically
   * a quick overall color setting method.
   * @param {RGBColor} color Defines the RGB color array..
   */
  setColorFrom(color: RGBColor): boolean;

  /**
   * Set the lighting cone angle of a positional light in degrees.
   * This is the angle between the axis of the cone and a ray along the edge
   * of the cone.
   * A value of 90 (or more) indicates that you want no spot lighting effects
   * just a positional light.
   * @param {Number} coneAngle The cone angle.
   */
  setConeAngle(coneAngle: number): boolean;

  /**
   * Set the lighting falloff angle of a positional light in degrees.
   * This is the angle that sets how much the cone will be extended to
   * smooth the border. A value of 0 indicates that the spot light will
   * have a completely sharp edge (this does not mean completely sharp
   * lighting, just that the border will be sharp).
   * @param {Number} coneFalloff The cone falloff angle.
   */
  setConeFalloff(coneFalloff: number): boolean;

  /**
   * Set the position and focal point of a light based on elevation and
   * azimuth. The light is moved so it is shining from the given angle. Angles
   * are given in degrees. If the light is a positional light, it is made
   * directional instead.
   * @param {Number} elevation
   * @param {Number} azimuth
   */
  setDirectionAngle(elevation: number, azimuth: number): boolean;

  /**
   * Set the direction vector of the light from X, Y, and Z values
   * @param {Number} x The x coordinate.
   * @param {Number} y The y coordinate.
   * @param {Number} z The z coordinate.
   */
  setDirection(x: number, y: number, z: number): boolean;

  /**
   * Set the direction vector of the light from X, Y, and Z values
   * @param {Vector3} direction
   */
  setDirection(direction: Vector3): boolean;

  /**
   * Set the exponent of the cosine used in positional lighting.
   * @param {Number} exponent The exponent of the cosine.
   */
  setExponent(exponent: number): boolean;

  /**
   * Set the focal point.
   * @param {Number} x The x coordinate.
   * @param {Number} y The y coordinate.
   * @param {Number} z The z coordinate.
   */
  setFocalPoint(x: number, y: number, z: number): boolean;

  /**
   * Set the focal point from an array
   * @param {Vector3} focalPoint The focal point array.
   */
  setFocalPointFrom(focalPoint: Vector3): boolean;

  /**
   * Set the brightness of the light (from one to zero).
   * @param {Number} intensity
   */
  setIntensity(intensity: number): boolean;

  /**
   * Set the type of the light to lightType
   * @param {LIGHT_TYPES} lightType The light type.
   */
  setLightType(lightType: LIGHT_TYPES): boolean;

  /**
   * Set the type of the light is CameraLight.
   */
  setLightTypeToCameraLight(): boolean;

  /**
   * Set the the type of the light is HeadLight.
   */
  setLightTypeToHeadLight(): boolean;

  /**
   * Set the the type of the light is SceneLight.
   */
  setLightTypeToSceneLight(): boolean;

  /**
   * Check if the type of the light is CameraLight.
   */
  lightTypeIsCameraLight(): boolean;

  /**
   * Check if the type of the light is HeadLight.
   */
  lightTypeIsHeadLight(): boolean;

  /**
   * Check if the type of the light is SceneLight.
   */
  lightTypeIsSceneLight(): boolean;

  /**
   * Set the position of the light.
   * @param {Number} x The x coordinate.
   * @param {Number} y The y coordinate.
   * @param {Number} z The z coordinate.
   */
  setPosition(x: number, y: number, z: number): boolean;

  /**
   * Set the position of the light.
   * @param {Vector3} position The position coordinate of the light.
   */
  setPositionFrom(position: Vector3): boolean;

  /**
   * Turn positional lighting on or off.
   * @param {Boolean} positional The positional value.
   */
  setPositional(positional: boolean): boolean;

  /**
   * Set the shadow intensity By default a light will be completely blocked
   * when in shadow by setting this value to less than 1.0 you can control how
   * much light is attenuated when in shadow.
   * @param {Number} shadowAttenuation The shadow attenuation value.
   */
  setShadowAttenuation(shadowAttenuation: number): boolean;

  /**
   * Turn the light on or off.
   * @param {Boolean} switchValue The switch value.
   */
  setSwitch(switchValue: boolean): boolean;

  /**
   * Set the light's transformation matrix.
   * @param {mat4} transformMatrix The transform matrix.
   */
  setTransformMatrix(transformMatrix: mat4): boolean;
}

/**
 * Method use to decorate a given object (publicAPI+model) with vtkLight characteristics.
 *
 * @param publicAPI object on which methods will be bounds (public)
 * @param model object on which data structure will be bounds (protected)
 * @param {ILightInitialValues} [initialValues] (default: {})
 */
export function extend(
  publicAPI: object,
  model: object,
  initialValues?: ILightInitialValues
): void;

/**
 * Method use to create a new instance of vtkLight with the focal point at the origin and its position
 * set to [0, 0, 1]. The light is a SceneLight, its color is white, intensity=1, the light is turned on,
 * positional lighting is off, coneAngle=30, coneFalloff=5, AttenuationValues=[1, 0, 0], exponent=1 and the transformMatrix is null.
 * @param {ILightInitialValues} [initialValues] for pre-setting some of its content
 */
export function newInstance(initialValues?: ILightInitialValues): vtkLight;

/**
 * vtkLight is a virtual light for 3D rendering. It provides methods to locate
 * and point the light, turn it on and off, and set its brightness and color.
 * In addition to the basic infinite distance point light source attributes,
 * you also can specify the light attenuation values and cone angle.
 * These attributes are only used if the light is a positional light.
 * The default is a directional light (e.g. infinite point light source).
 *
 * Lights have a type that describes how the light should move with respect
 * to the camera. A Headlight is always located at the current camera position
 * and shines on the camera’s focal point. A CameraLight also moves with
 * the camera, but may not be coincident to it. CameraLights are defined
 * in a normalized coordinate space where the camera is located at (0, 0, 1),
 * the camera is looking at (0, 0, 0), and up is (0, 1, 0). Finally, a
 * SceneLight is part of the scene itself and does not move with the camera.
 * (Renderers are responsible for moving the light based on its type.)
 *
 * Lights have a transformation matrix that describes the space in which
 * they are positioned. A light’s world space position and focal point
 * are defined by their local position and focal point, transformed by
 * their transformation matrix (if it exists).
 */
export declare const vtkLight: {
  newInstance: typeof newInstance;
  extend: typeof extend;
  LIGHT_TYPES: LIGHT_TYPES;
};
export default vtkLight;