import * as THREE from 'three'
import BaseRenderer from '@/core/base/BaseRenderer.ts'
import { getLineId } from '@/core/ModelUtils.ts'
import { LineMaterial } from 'three/examples/jsm/lines/LineMaterial.js'
import { LineGeometry } from 'three/examples/jsm/lines/LineGeometry.js'
import { Line2 } from 'three/examples/jsm/lines/Line2.js'
import { numberToString } from '@/utils/webutils.ts'
import { CSS2DObject } from 'three/examples/jsm/renderers/CSS2DRenderer'
import { Text } from 'troika-three-text'
import SimSunTTF from '@/assets/fonts/simsunb.ttf'

/**
 * 辅助测量工具渲染器
 */
export default class MeasureRenderer extends BaseRenderer {
  /**
   * 当前测绘内容组, 所有测量点、线、标签都在这个组中. 但不包括临时点、线
   */
  group: THREE.Group

  static GROUP_NAME = 'measure_group'
  static LABEL_NAME = 'measure_label'
  static POINT_NAME = 'measure_point'
  static LINE_NAME = 'measure_line'

  public useHtmlLabel = false

  pointMaterial: THREE.Material
  lineMaterial: LineMaterial

  readonly defulePositionY = 0.01
  readonly defaultScale: THREE.Vector3 = new THREE.Vector3(0.1, 0.1, 0.1)
  readonly defaultRotation: THREE.Vector3 = new THREE.Vector3(90, 0, 0)

  constructor(itemTypeName: string) {
    super(itemTypeName)
  }

  async init() {
    this.pointMaterial = new THREE.SpriteMaterial({
      color: 0xFFFF99, // 0x303133,
      transparent: true,
      side: THREE.DoubleSide,
      opacity: 1,
      sizeAttenuation: true
    })
    this.lineMaterial = new LineMaterial({
      color: 0xFF8C00,
      linewidth: 1,
      vertexColors: false,
      dashed: false
    })
    return Promise.all([
      super.init()
    ])
  }

  /**
   * 所有的点，必须使用同一个尺寸, 改属性也无效
   */
  override afterCreateOrUpdatePoint(item: ItemJson, option: RendererCudOption, objects: THREE.Object3D[]) {
    super.afterCreateOrUpdatePoint(item, option, objects)

    const point = objects[0]

    point.scale.set(this.defaultScale.x, this.defaultScale.y, this.defaultScale.z)
    point.rotation.set(
      THREE.MathUtils.degToRad(this.defaultRotation.x),
      THREE.MathUtils.degToRad(this.defaultRotation.y),
      THREE.MathUtils.degToRad(this.defaultRotation.z)
    )
  }


  createLineBasic(start: ItemJson, end: ItemJson, type: LinkType): THREE.Object3D[] {
    const geom = new LineGeometry()
    const obj = new Line2(geom, this.lineMaterial)
    obj.frustumCulled = false
    obj.name = MeasureRenderer.LINE_NAME
    obj.uuid = getLineId(start.id, end.id, type)

    return [obj]
  }

  createPointBasic(item: ItemJson, option?: RendererCudOption): THREE.Object3D[] {
    // const tt = new THREE.BoxGeometry(1, 1, 1)
    // const obj = new THREE.Mesh(tt, this.movelinePoint)
    // obj.name = MeasureRenderer.POINT_NAME
    // obj.uuid = item.id
    //
    // return [obj]

    // 创建平面几何体
    const obj = new THREE.Sprite(this.pointMaterial as THREE.SpriteMaterial)
    obj.name = MeasureRenderer.POINT_NAME
    return [obj]
  }

  appendToScene(...objects: THREE.Object3D[]) {
    if (!this.group || this.group.parent !== this.tempViewport.scene.scene) {
      if (this.group && this.group.parent !== this.tempViewport.scene.scene) {
        // 幻影加载问题
        this.group.parent.removeFromParent()
      }

      this.group = new THREE.Group()
      this.group.name = MeasureRenderer.GROUP_NAME
      this.tempViewport?.scene.add(this.group)
    }

    const dragObjects = objects.filter(obj => !!obj.userData.draggable)
    this.tempViewport.dragControl.setDragObjects(dragObjects, 'push')

    this.group.add(...objects)
  }

  afterCreateOrUpdateLine(start: ItemJson, end: ItemJson, type: LinkType, option: RendererCudOption, objects: THREE.Object3D[]) {
    super.afterCreateOrUpdateLine(start, end, type, option, objects)

    const startPoint = this.tempViewport?.entityManager.findObjectsById(start.id)?.[0]
    const endPoint = this.tempViewport?.entityManager.findObjectsById(end.id)?.[0]

    const p0 = startPoint.position
    const p1 = endPoint.position

    const dist = p0.distanceTo(p1)
    const label = numberToString(dist) + ' m'

    const position = new THREE.Vector3().addVectors(p0, p1).multiplyScalar(0.5)
    let labelObj: Text | CSS2DObject | undefined = objects[0].userData.labelObj
    if (!labelObj || !labelObj.parent) {
      labelObj = this.createLabel(label)
      this.group.add(labelObj)
      objects[0].userData.labelObj = labelObj
    }

    labelObj.position.set(position.x, position.y + 0.3, position.z - 0.2)

    if (this.useHtmlLabel) {
      labelObj.element.innerHTML = label

    } else {
      // 让文本朝向摄像机
      labelObj.quaternion.copy(this.tempViewport.camera.quaternion)
      labelObj.text = label
      labelObj.sync()
    }
  }

  afterDeleteLine(start: ItemJson, end: ItemJson, type: LinkType, option: RendererCudOption, objects: THREE.Object3D[]) {
    super.afterDeleteLine(start, end, type, option, objects)

    // 删除标签
    const labelObj = objects[0]?.userData?.labelObj
    if (labelObj && labelObj.parent) {
      labelObj.parent.remove(labelObj)
    }
  }

  /**
   * 创建标签
   */
  createLabel(text: string): Text | CSS2DObject {
    if (this.useHtmlLabel) {
      const div = document.createElement('div')
      div.className = 'css2dObjectLabel'
      div.innerHTML = text
      div.style.padding = '5px 8px'
      div.style.color = '#fff'
      div.style.fontSize = '14px'
      div.style.position = 'absolute'
      div.style.backgroundColor = 'rgba(25, 25, 25, 0.3)'
      div.style.borderRadius = '12px'
      div.style.top = '0px'
      div.style.left = '0px'
      // div.style.pointerEvents = 'none' //避免HTML元素影响场景的鼠标事件
      const obj = new CSS2DObject(div)
      obj.name = MeasureRenderer.LABEL_NAME
      return obj

    } else {
      const label = new Text()
      label.text = text
      label.font = SimSunTTF
      label.fontSize = 0.4
      label.color = '#333333'
      label.opacity = 0.8
      label.padding = 0.2
      label.anchorX = 'center'
      label.anchorY = 'middle'
      label.depthOffset = 1
      label.backgroundColor = '#000000'     // 黑色背景
      label.backgroundOpacity = 0.6         // 背景半透明
      label.padding = 0.2 // 内边距
      label.material.depthTest = false
      label.name = MeasureRenderer.LABEL_NAME

      label.sync()
      return label
    }
  }

  dispose() {
    super.dispose()

    if (this.group && this.group.parent) {
      this.group.parent.remove(this.group)
    }
    this.group = undefined

    this.pointMaterial.dispose()
    this.lineMaterial.dispose()
  }
}