import { CubeCamera, LinearFilter, RGBAFormat, Scene, Vector3, WebGLCubeRenderTarget, WebGLRenderer } from 'three'

export default class CubemapCapturer {
  width: number
  height: number
  renderer: WebGLRenderer
  cubeCamera: CubeCamera
  cubeRenderTarget: WebGLCubeRenderTarget
  sceneToRender: Scene

  constructor(renderer: WebGLRenderer, sceneToRender: Scene, resolution: number) {
    this.width = resolution
    this.height = resolution
    this.sceneToRender = sceneToRender
    this.renderer = renderer
    this.cubeCamera = null!
    const gl = this.renderer.getContext()
    const cubeMapSize = Math.min(resolution, gl.getParameter(gl.MAX_CUBE_MAP_TEXTURE_SIZE))
    this.cubeRenderTarget = new WebGLCubeRenderTarget(cubeMapSize, {
      format: RGBAFormat,
      magFilter: LinearFilter,
      minFilter: LinearFilter
    })
    this.cubeCamera = new CubeCamera(0.1, 1000, this.cubeRenderTarget)
  }

  update = (position: Vector3): WebGLCubeRenderTarget => {
    const autoClear = this.renderer.autoClear
    this.renderer.autoClear = true
    this.cubeCamera.position.copy(position)
    this.cubeCamera.update(this.renderer, this.sceneToRender)
    this.renderer.autoClear = autoClear
    return this.cubeRenderTarget
  }
}