export namespace THREENS {
  export type EulerOrder = string
  export type EulerArray = [number,number,number]|[number,number,number,EulerOrder]
    interface RendererOptions {
    antialias?: boolean
    alpha?: boolean
    canvas?: HTMLCanvasElement
  }

  export interface ArrowHelper extends LineSegments {
    new (dir: Vector3, origin: Vector3, len: number, c: Color|number): ArrowHelper
    setDirection (dir: Vector3): void
  }
  export interface AxesHelper extends LineSegments {
    new (n: number): AxesHelper
  }
  interface AxisHelper extends LineSegments {
    new (n: number): AxisHelper
  }
  interface BufferAttribute {
    new (v: Float32Array, n: number): BufferAttribute
    copyArray (a: number[]): void
  }
  export interface BufferGeometry {
    new (): BufferGeometry
    computeBoundingSphere (): void
    dispose (): void
    setAttribute (name: string, attr: BufferAttribute): void
    setIndex(a: number[]): void
  }
  export interface Camera extends Object3D {
    up: Vector3
  }
  export interface CameraHelper extends LineSegments {
    new (c: Camera): CameraHelper
    update (): void
  }
  export interface Color {
    new (c: number): Color
  }
  export interface Controls {
    enabled: boolean
    new (c: Camera, e: Element): Controls
    update (): void
  }
  export interface Disporsal {
    dispose (): void
  }
  interface Euler {
    new (): Euler
    fromArray (a:[number,number,number]|[number,number,number,string]): void
  }
  interface Float32BufferAttribute extends BufferAttribute {
    new (n: number, m: number): Float32BufferAttribute
  }
  export interface Fog {
    new (c: number|Color, near?:number,far?: number): Fog
  }
  export interface FogExp2 {
    new (c: number|Color,d?:number): FogExp2
  }
  export interface Group extends Object3D {
    new (): Group
  }
  export interface Line extends Object3D {
    new (g: BufferGeometry, m: Material): Line
  }
  interface LineSegments extends Line {
    new (): LineSegments
  }
  interface LineBasicMaterial extends Material {
    new (opt: any): LineBasicMaterial
  }
  interface Matrix3 {
    new (): Matrix3
  }
  export interface Matrix4 {
    new (): Matrix4    
  }
  interface Material {
    dispose (): void
  }
  export interface Mesh extends Object3D {
    geometry: BufferGeometry
    material: Material
  }
  export interface Object3D {
    new (): Object3D
    children: Object3D[]
    matrixWorld: Matrix4
    position: Vector3
    quaternion: Quaternion
    rotation: Euler
    scale: Vector3
    visible: boolean
    add (obj:Object3D|Object3D[]): void
    applyMatrix3 (mat: Matrix3): void
    applyMatrix4 (mat: Matrix4): void
    applyQuaternion (q: Quaternion): void
    getWorldDirection (v: Vector3): void
    getWorldQuaternion (q: Quaternion): void
    getWorldPosition (v: Vector3): void
    lookAt(v: Vector3): void
    remove (obj:Object3D|Object3D[]): void
    toJSON (): string
    translateOnAxis (axis: Vector3, distance: number): void
  }
  interface ObjectLoader {
    new (): ObjectLoader
    load (url: string, callback: (obj: Object3D) => void,
                       progress: (xhr: XMLHttpRequest) => void,
                       err: (xhr: XMLHttpRequest) => void): void
  }
  export interface OrbitControls extends Controls {
    new (): OrbitControls
  }
  export interface PerspectiveCamera extends Camera {
    aspect: number
    far: number
    focus: number
    fov: number
    near: number
    zoom: number
    new (w: number, raito: number, near: number, far: number): PerspectiveCamera
  }
  export interface Quaternion {
    new (): Quaternion
    new (x: number, y: number, z: number, w:number): Quaternion
    angleTo (q: Quaternion): number
    clone(): Quaternion
    copy (q: Quaternion): void
    multiply (q: Quaternion): void
    set (x: number, y: number, z: number, w:number): void
    setFromAxisAngle (v: Vector3, a: number): void
    setFromEuler(e: Euler): void
  }
  export interface Renderer {
    autoClear: boolean
    domElement: Element
    shadowMap: ShadowMap
    new (): THREENS.Renderer
    clear (): void
    render (s: Scene, c: Camera): void
    setClearColor (c: THREENS.Color|number, a?: number): void
    setClearAlpha (a: number): void
    setPixelRatio (ratio: number): void
    setSize(w: number, h: number): void
    getSize(rect: Vector2): void
  }
  export interface Scene extends Object3D {
    new (): Scene
    background: number|Color
    fog: Fog
  }
  export interface ShadowMap {
    enabled: boolean
    new () : ShadowMap
  }
  export interface Vector2 {
    width: number
    height: number
    new (): Vector2
    new (x: number, y: number): Vector2
    set (x: number, y: number): void
  }
  export interface Vector3 {
    x: number
    y: number
    z: number
    new (): Vector3
    new (x: number, y: number, z: number): Vector3
    add (v: Vector3): void
    applyQuaternion(q: Quaternion): void
    clone(): Vector3
    copy (v: Vector3): void
    multiplyScalar (n: number): void
    normalize (): Vector3
    set (x: number, y: number, z: number): void
  }
  export interface WebGLRenderer extends Renderer {
    new (opt: RendererOptions): WebGLRenderer
  }
  export interface THREE {
    ArrowHelper?: ArrowHelper
    AxesHelper?: AxesHelper
    AxisHelper?: AxisHelper
    BufferAttribute: BufferAttribute
    BufferGeometry: BufferGeometry
    CameraHelper?: CameraHelper
    Color: Color
    Euler: Euler
    Float32BufferAttribute: Float32BufferAttribute
    Fog: Fog
    FogExp2: FogExp2
    Group: Group
    Line: Line
    LineBasicMaterial: LineBasicMaterial
    LineSegments: LineSegments
    Matrix3: Matrix3
    Matrix4: Matrix4
    Object3D: Object3D
    ObjectLoader: ObjectLoader
    OrbitControls?: OrbitControls
    PerspectiveCamera: PerspectiveCamera
    Quaternion: Quaternion
    Renderer: Renderer
    Scene: Scene
    Vector2: Vector2
    Vector3: Vector3
    WebGLRenderer: WebGLRenderer
  }
}

export class ThreeUtil {
  private static isDisporsal (obj: any): obj is THREENS.Disporsal {
    return 'dispose' in obj && typeof obj['dispose'] === 'function'
  }
  private static isMesh (obj: THREENS.Object3D): obj is THREENS.Mesh {
    return 'isMesh' in obj && obj['isMesh'] === true
  }
  static disposeChildObject (obj: THREENS.Object3D) {
    while (obj.children.length > 0) {
      this.disposeChildObject(obj.children[0])
      obj.remove(obj.children[0])
    }
    if (ThreeUtil.isMesh(obj)) {
      if (obj.geometry) { obj.geometry.dispose() }

      if (obj.material) {
        for (const propKey of Object.keys(obj.material)) {
          const prop = (obj.material as {[key: string]: any} )[propKey] as any
          if (ThreeUtil.isDisporsal(prop)) {
            prop.dispose()
          }
        }
        obj.material.dispose()
      }
    }
  }
}