import type Viewport from '@/core/engine/Viewport'
import * as THREE from 'three'
import { getLineId } from '@/core/ModelUtils.ts'
import { Line2 } from 'three/examples/jsm/lines/Line2'

/**
 * 基本渲染器基类
 * 定义了点 / 线如何渲染到 Three.js 场景中
 */
export default abstract class BaseRenderer {

  /**
   * 每次 beginUpdate 时记录临时 viewport, endUpdate 之后要马上删除, 因为 BaseRenderer 全局只有一个实例, 而 viewport 有多个
   */
  tempViewport?: Viewport = undefined

  /**
   * 开始更新
   * @param viewport 当前视口
   */
  beginUpdate(viewport: Viewport): void {
    this.tempViewport = viewport
  }

  /**
   * 创建一个最基本的点对象, 不用管 item 的 name / id / 位置 / 转换 / 大小 和 userData, 除非有明确定义
   */
  abstract createPointBasic(item: ItemJson, option?: RendererCudOption): THREE.Object3D[]

  /**
   * 创建测量线
   */
  abstract createLineBasic(start: ItemJson, end: ItemJson, type: LinkType): THREE.Object3D[]

  /**
   * 创建一个点
   * @param item 点的定义
   * @param option 渲染选项
   */
  createPoint(item: ItemJson, option?: RendererCudOption) {
    // 由基础类创造一个属于自己的点演示
    const points = this.createPointBasic(item, option)
    _.forEach(points, (point) => {
      if (item.name) {
        point.name = item.name
      }
      point.userData = _.cloneDeep(item.dt) || {}
      _.extend(point.userData, {
        t: item.t,
        center: [],
        in: [],
        out: [],
        selectable: true,
        protected: false
      })

      point.position.set(item.tf[0][0], item.tf[0][1], item.tf[0][2])

      point.rotation.set(
        THREE.MathUtils.degToRad(item.tf[1][0]),
        THREE.MathUtils.degToRad(item.tf[1][1]),
        THREE.MathUtils.degToRad(item.tf[1][2])
      )

      point.scale.set(item.tf[2][0], item.tf[2][1], item.tf[2][2])
    })
    this.tempViewport.entityManager.appendObject(item.id, points)
  }


  /**
   * 删除一个点
   * @param id 点的唯一标识
   * @param option 渲染选项
   */
  deletePoint(id: string, option?: RendererCudOption) {
    const objects = this.tempViewport.entityManager.findObjectsById(id)
    if (objects) {
      this.tempViewport.scene.remove(...objects)
    }

    this.tempViewport.entityManager.deleteEntityOnly(id)
    this.tempViewport.entityManager.deleteObjectsOnly(id)
  }

  /**
   * 更新一个点
   * @param item 点的定义
   * @param option 渲染选项
   */
  updatePoint(item: ItemJson, option?: RendererCudOption) {
    const objects = this.tempViewport.entityManager.findObjectsById(item.id)
    if (!objects || objects.length === 0) {
      console.warn(`Point with ID "${item.id}" does not exist.`)
      return
    }

    _.forEach(objects, (point) => {
      point.name = item.name || point.name
      point.userData = _.cloneDeep(item.dt) || {}
      _.extend(point.userData, {
        t: item.t,
        center: [],
        in: [],
        out: [],
        selectable: true,
        protected: false
      })

      point.rotation.set(
        THREE.MathUtils.degToRad(item.tf[1][0]),
        THREE.MathUtils.degToRad(item.tf[1][1]),
        THREE.MathUtils.degToRad(item.tf[1][2])
      )

      point.scale.set(item.tf[2][0], item.tf[2][1], item.tf[2][2])
    })
  }

  /**
   * 创建一根线
   * @param start 起点
   * @param end 终点
   * @param type 线的类型
   * @param option 渲染选项
   */
  createLine(start: ItemJson, end: ItemJson, type: LinkType, option?: RendererCudOption) {
    const lines = this.createLineBasic(start, end, type)
    const id = getLineId(start.id, end.id, type)

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

    _.forEach(lines, (line) => {
      line.userData = {
        t: 'line',
        start: start.id,
        end: end.id,
        type: type
      }
      line.name = `${start.id}-${end.id}-${type}`

      this.tempViewport.entityManager.findObjectsById(id)

      const geom = line.geometry
      geom.setFromPoints([startPoint.position, endPoint.position])
    })

    this.tempViewport.entityManager.appendLineObject(id, lines)
  }

  /**
   * 更新一根线
   * @param start 起点
   * @param end 终点
   * @param type 线的类型
   * @param option 渲染选项
   */
  updateLine(start: ItemJson, end: ItemJson, type: LinkType, option?: RendererCudOption) {
    const lineId = getLineId(start.id, end.id, type)

    const lines = this.tempViewport.entityManager.findLineObjectsById(lineId)
    _.forEach(lines, (line: THREE.Object3D) => {
      const startPoint = this.tempViewport.entityManager.findObjectsById(start.id)?.[0]
      const endPoint = this.tempViewport.entityManager.findObjectsById(end.id)?.[0]

      if (line instanceof Line2) {
        const geom = line.geometry
        geom.setFromPoints([startPoint.position, endPoint.position])
      }
    })
  }

  /**
   * 删除一根线
   * @param start 起点
   * @param end 终点
   * @param option 渲染选项
   */
  deleteLine(start: ItemJson, end: ItemJson, option?: RendererCudOption) {
    const id = getLineId(start.id, end.id, 'center')
    const lines = this.tempViewport.entityManager.findLineObjectsById(id)
    if (lines) {
      this.tempViewport.scene.remove(...lines)
    }

    this.tempViewport.entityManager.deleteLineObjectOnly(id)
  }

  /**
   * 结束更新
   */
  endUpdate(): void {
    this.tempViewport = undefined
  }
}