import * as THREE from 'three'
import { FollowMotionHelper, System, VirtualEntity } from '../../src'
import { ExampleEntity } from './example-entity'

export class ExampleSystem extends System {
  async addEntities() {
    // 创建一个实体并添加到系统中
    const entity = new ExampleEntity({
      name: 'example-entity', // 名称
      position: new THREE.Vector3(0, 0, 0), // 位置
      rotation: new THREE.Euler(0, 0, 0) // 旋转
    })

    await this.addEntity(entity)

    // 创建另一个实体并添加到系统中
    const entity1 = new ExampleEntity({
      name: 'example-entity1', // 名称
      position: new THREE.Vector3(0, 0, 1000), // 位置
      rotation: new THREE.Euler(0, 0, 0) // 旋转
    })

    await this.addEntity(entity1)
  }

  async addHelpers() {
    // 创建一个跟随运动助手并添加到系统中
    const helper = new FollowMotionHelper()
    await this.addHelper('follow-motion', helper)
  }

  registerEvents() {
    // 注册事件监听
    const { EventManager } = this._app
    EventManager.subscribe(
      'move', // 事件名称
      (data: any) => {
        // 事件处理函数
        const entity = this.getEntity('example-entity')
        // 如果实体存在，则更新其姿态
        entity && entity.updatePose(data.position, entity.Quaternion, data.animateTime)
      },
      'example-system' // 事件作用域
    )
  }

  async onAdded() {
    // 当系统被添加时执行的操作
    await this.addEntities()
    this.addHelpers()
    this.registerEvents()

    // 获取跟随运动助手并附加配置
    const helper: FollowMotionHelper = this.getHelper('follow-motion')
    helper.attach('follow1', {
      entity: this.getEntity('example-entity1'), // 要跟随的实体
      followObject: this.getEntity('example-entity')?.group // 跟随的目标对象
    })
  }

  onRemoved(): void {
    // 当系统被移除时执行的操作
    const { EventManager } = this._app
    EventManager.unsubscribeInScope('move', 'example-system')
  }

  onUpdating(deltaTime: number): void {
    // 系统更新时执行的操作
  }
}