import type Viewport from '@/core/engine/Viewport'
import * as THREE from 'three'

let pmFn, otFn, lvFn

/**
 * 鼠标移动时，将鼠标位置的坐标转换为设计图上的坐标，并设置到 designer.mousePos 属性中
 */
export default class MouseMoveInspect {
  viewport: Viewport
  canvas: HTMLCanvasElement

  constructor() {
  }

  init(viewport: Viewport) {
    this.viewport = viewport
    this.canvas = this.viewport.renderer.domElement as HTMLCanvasElement

    pmFn = this.mouseMove.bind(this)
    otFn = this.mouseLv.bind(this)
    lvFn = this.mouseLv.bind(this)
    this.canvas.addEventListener('pointermove', pmFn)
    this.canvas.addEventListener('pointerout', otFn)
    this.canvas.addEventListener('mouseleave', lvFn)
  }

  dispose() {
    this.canvas.removeEventListener('pointermove', pmFn)
    pmFn = undefined
    this.canvas.removeEventListener('pointerout', otFn)
    otFn = undefined
    this.canvas.removeEventListener('mouseleave', lvFn)
    lvFn = undefined
  }

  mouseLv(event: MouseEvent) {
    this.viewport.state.mouse.x = NaN
    this.viewport.state.mouse.z = NaN
    window['CurrentMouseInfo'] = {
      x: NaN,
      z: NaN,
      isShiftKey: false,
      isCtrlKey: false,
      isAltKey: false,
      isMetaKey: false
    }
  }

  mouseMove = _.throttle(function(this: MouseMoveInspect, event: MouseEvent) {

    const pointv = new THREE.Vector2()
    pointv.x = event.offsetX / this.viewport.renderer.domElement.offsetWidth
    pointv.y = event.offsetY / this.viewport.renderer.domElement.offsetHeight

    const mouse = new THREE.Vector2()
    mouse.set((pointv.x * 2) - 1, -(pointv.y * 2) + 1)

    // 当前鼠标所在的点
    const point = this.viewport.getClosestIntersection(event)
    if (!point) {
      return
    }

    this.viewport.state.mouse.x = point.x
    this.viewport.state.mouse.z = point.z

    window['CurrentMouseInfo'] = {
      viewport: this.viewport,
      x: point.x,
      z: point.z,
      isShiftKey: event.shiftKey,
      isCtrlKey: event.ctrlKey,
      isAltKey: event.altKey,
      isMetaKey: event.metaKey,
      mouse: mouse
    }

  }, 1)

  animate(): void {
  }
}