import {
  Vector3
} from '../../../src/Three';

export interface RandomGenerator {
  random(): number;
  getSeed(): number;
  setSeed(seed: number): void;
}

export interface LightningSegment {
  iteration: number;
  pos0: Vector3;
  pos1: Vector3;
  linPos0: Vector3;
  linPos1: Vector3;
  up0: Vector3;
  up1: Vector3;
  radius0: number;
  radius1: number;
  fraction0: number;
  fraction1: number;
  positionVariationFactor: number;
}

export interface LightningSubray {
  seed: number;
  maxIterations: number;
  recursion: number;
  pos0: Vector3;
  pos1: Vector3;
  linPos0: Vector3;
  linPos1: Vector3;
  up0: Vector3;
  up1: Vector3;
  radius0: number;
  radius1: number;
  birthTime: number;
  deathTime: number;
  timeScale: number;
  roughness: number;
  straightness: number;
  propagationTimeFactor: number;
  vanishingTimeFactor: number;
  endPropagationTime: number;
  beginVanishingTime: number;
}

export interface RayParameters {
  sourceOffset?: Vector3;
  destOffset?: Vector3;

  timeScale?: number;
  roughness?: number;
  straightness?: number;

  up0?: Vector3;
  up1?: Vector3;
  radius0?: number;
  radius1?: number;
  radius0Factor? : number;
  radius1Factor? : number;
  minRadius? : number;

  isEternal?: boolean;
  birthTime?: number;
  deathTime?: number;
  propagationTimeFactor?: number;
  vanishingTimeFactor?: number;
  subrayPeriod?: number;
  subrayDutyCycle?: number;

  maxIterations?: number;
  isStatic?: boolean;
  ramification?: number;
  maxSubrayRecursion?: number;
  recursionProbability?: number;
  generateUVs?: boolean;

  randomGenerator?: RandomGenerator;
  noiseSeed?: number;

  onDecideSubrayCreation?: (segment: LightningSegment, lightningStrike: LightningStrike) => void;
  onSubrayCreation?: (segment: LightningSegment, parentSubray: LightningSubray, childSubray: LightningSubray, lightningStrike: LightningStrike) => void;
}

export class LightningStrike {
  constructor(rayParameters?: RayParameters);
  copyParameters( dest?: RayParameters, source?: RayParameters): RayParameters;

  // Ray states
  static readonly RAY_INITIALIZED: number;
  static readonly RAY_UNBORN: number;
  static readonly RAY_PROPAGATING: number;
  static readonly RAY_STEADY: number;
  static readonly RAY_VANISHING: number;
  static readonly RAY_EXTINGUISHED: number;

  state: number;

  update(time: number): void;

  copy(source: LightningStrike): LightningStrike;
  clone(): LightningStrike;
}