import _ from 'lodash'
import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import EsDragControls from './model2DEditor/EsDragControls'
import Stats from 'three/examples/jsm/libs/stats.module'
import type WorldModel from '@/model/WorldModel.ts'
import $ from 'jquery'
import { reactive, watch } from 'vue'
import type { ITool } from '@/designer/model2DEditor/tools/ITool.ts'
import { CSS3DRenderer } from 'three/examples/jsm/renderers/CSS3DRenderer'
import { CSS2DRenderer } from 'three/examples/jsm/renderers/CSS2DRenderer'
import { getAllItemTypes } from '@/runtime/DefineItemType.ts'
import type { ItemTypeDefineOption } from '@/model/itemType/ItemTypeDefine.ts'

import type Toolbox from '@/model/itemType/Toolbox.ts'
import { calcPositionUseSnap } from '@/model/ModelUtils.ts'
import SelectInspect from '@/designer/model2DEditor/tools/SelectInspect.ts'
import MouseMoveInspect from '@/designer/model2DEditor/tools/MouseMoveInspect.ts'

/**
 * 编辑器对象
 * 这是非双向绑定的设计器对象，不记录状态，只记录全局使用到的对象，(实体类使用)
 */
export default class Viewport {
  viewerDom: HTMLElement
  scene: THREE.Scene
  camera: THREE.OrthographicCamera
  renderer: THREE.WebGLRenderer
  axesHelper: THREE.GridHelper
  gridHelper: THREE.GridHelper
  statsControls: Stats
  controls: OrbitControls
  worldModel: WorldModel
  raycaster: THREE.Raycaster
  dragControl: EsDragControls
  animationFrameId: any = null

  //搭配 state.cursorMode = xxx 之后， currentTool.start(第一个参数) 使用
  toolStartObject: THREE.Object3D | null = null
  currentTool: Toolbox | null = null
  tools: ITool[] = [
    new MouseMoveInspect(),
    new SelectInspect()
  ]
  toolbox: Record<string, Toolbox> = {}

  /**
   * 监听窗口大小变化
   */
  resizeObserver?: ResizeObserver

  /**
   * vue 的 watcher
   */
  watchList: (() => void)[] = []

  css2DRenderer: CSS2DRenderer = new CSS2DRenderer()
  css3DRenderer: CSS3DRenderer = new CSS3DRenderer()

  //@ts-ignore
  state: ViewportState = reactive({
    currentFloor: '',
    isReady: false,
    cursorMode: 'normal',
    selectedObject: null,
    camera: {
      position: { x: 0, y: 0, z: 0 },
      rotation: { x: 0, y: 0, z: 0 }
    },
    mouse: {
      x: 0,
      y: 0
    }
  })

  constructor(worldModel: WorldModel) {
    this.worldModel = worldModel
  }

  dispatchSignal(signal: string, data?: any) {
    // console.log('signal', signal, data)
  }

  /**
   * 初始化 THREE 渲染器
   */
  initThree(viewerDom: HTMLElement, floor: string) {
    console.log('viewport on floor', floor)
    this.state.currentFloor = floor
    this.viewerDom = viewerDom
    const rect = viewerDom.getBoundingClientRect()
    this.worldModel.registerViewport(this)

    // 场景
    const scene = this.worldModel.getSceneByFloor(this, this.state.currentFloor)
    this.scene = scene

    // 渲染器
    const renderer = new THREE.WebGLRenderer({
      logarithmicDepthBuffer: true,
      antialias: true,
      alpha: true,
      precision: 'mediump',
      premultipliedAlpha: true,
      preserveDrawingBuffer: false,
      powerPreference: 'high-performance'
    })
    renderer.debug.checkShaderErrors = true
    //@ts-ignore
    renderer.outputEncoding = THREE.SRGBColorSpace
    renderer.clearDepth()
    renderer.shadowMap.enabled = true
    renderer.toneMapping = THREE.ACESFilmicToneMapping
    renderer.setPixelRatio(Math.max(Math.ceil(window.devicePixelRatio), 1))
    renderer.setViewport(0, 0, this.viewerDom.offsetWidth, this.viewerDom.offsetHeight)
    renderer.setSize(this.viewerDom.offsetWidth, this.viewerDom.offsetHeight)

    viewerDom.appendChild(renderer.domElement)

    renderer.domElement.style.touchAction = 'none'

    // 防止重复添加
    if (this.css2DRenderer.domElement.parentNode !== this.viewerDom) {
      this.css2DRenderer.setSize(this.viewerDom.offsetWidth, this.viewerDom.offsetHeight)
      this.css2DRenderer.domElement.setAttribute('id', 'astral-3d-preview-css2DRenderer')
      this.css2DRenderer.domElement.style.position = 'absolute'
      this.css2DRenderer.domElement.style.top = '0px'
      this.css2DRenderer.domElement.style.pointerEvents = 'none'

      this.viewerDom.appendChild(this.css2DRenderer.domElement)
    }

    // 防止重复添加
    if (this.css3DRenderer.domElement.parentNode !== this.viewerDom) {
      this.css3DRenderer.setSize(this.viewerDom.offsetWidth, this.viewerDom.offsetHeight)
      this.css3DRenderer.domElement.setAttribute('id', 'astral-3d-preview-css3DRenderer')
      this.css3DRenderer.domElement.style.position = 'absolute'
      this.css3DRenderer.domElement.style.top = '0px'
      this.css3DRenderer.domElement.style.pointerEvents = 'none'

      this.viewerDom.appendChild(this.css3DRenderer.domElement)
    }

    this.renderer = renderer

    // 创建正交摄像机
    this.initMode2DCamera()

    // 注册拖拽组件
    this.dragControl = new EsDragControls(this)

    // 辅助线
    const gridOption = this.worldModel.gridOption
    const axesHelper = new THREE.GridHelper(gridOption.axesSize, gridOption.axesDivisions)
    axesHelper.material.color.setHex(gridOption.axesColor)
    axesHelper.material.linewidth = 2
    axesHelper.material.opacity = gridOption.gridOpacity
    axesHelper.material.transparent = true
    if (!gridOption.axesEnabled) {
      axesHelper.visible = false
    }

    // @ts-ignore
    axesHelper.material.vertexColors = false
    this.axesHelper = axesHelper
    this.scene.add(this.axesHelper)

    const gridHelper = new THREE.GridHelper(gridOption.gridSize, gridOption.gridDivisions)
    gridHelper.material.color.setHex(gridOption.gridColor)
    gridHelper.material.opacity = gridOption.gridOpacity
    gridHelper.material.transparent = true
    // @ts-ignore
    gridHelper.material.vertexColors = false
    if (!gridOption.gridEnabled) {
      gridHelper.visible = false
    }

    this.gridHelper = gridHelper
    this.scene.add(this.gridHelper)

    // 光照
    const ambientLight = new THREE.AmbientLight(0xffffff, 0.8)
    scene.add(ambientLight)

    // const directionalLight = new THREE.DirectionalLight(0xffffff, 1.5)
    // directionalLight.position.set(5, 5, 5).multiplyScalar(3)
    // directionalLight.castShadow = true
    // scene.add(directionalLight)
    //
    // const hemisphereLight = new THREE.HemisphereLight(0xffffff, 0x444444, 1)
    // scene.add(hemisphereLight)

    // 性能监控
    const statsControls = new Stats()
    this.statsControls = statsControls
    statsControls.showPanel(0)
    statsControls.dom.style.position = 'absolute'
    statsControls.dom.style.top = '0'
    statsControls.dom.style.left = '0'
    viewerDom.parentElement.parentElement.appendChild(statsControls.dom)
    $(statsControls.dom).children().css('height', '28px')

    this.animate()

    // 监听事件
    this.watchList.push(watch(() => this.state.camera.position.y, (newVal) => {
      if (!this.state.isReady) {
        return
      }
      this.updateGridVisibility()
    }))

    // 监听窗口大小变化
    if (this.resizeObserver) {
      this.resizeObserver.unobserve(this.viewerDom)
    }
    this.resizeObserver = new ResizeObserver(this.handleResize.bind(this))
    this.resizeObserver.observe(this.viewerDom)

    // 初始化射线投射器
    this.raycaster = new THREE.Raycaster()

    // 初始化所有常驻工具
    for (const tool of this.tools) {
      tool.init(this)
    }

    // 触发所有物品类型的 afterAddViewport 方法
    _.forEach(getAllItemTypes(), (itemType: ItemTypeDefineOption) => {
      itemType.clazz.afterAddViewport(this)
    })

    this.state.isReady = true
  }

  /**
   * 初始化2D相机
   */
  initMode2DCamera() {
    if (this.camera) {
      this.scene.remove(this.camera)
    }

    // ============================ 创建正交相机
    const viewerDom = this.viewerDom
    const cameraNew = new THREE.OrthographicCamera(
      viewerDom.clientWidth / -2,
      viewerDom.clientWidth / 2,
      viewerDom.clientHeight / 2,
      viewerDom.clientHeight / -2,
      1,
      500
    )
    cameraNew.position.set(0, 100, 0)
    cameraNew.lookAt(0, 0, 0)
    cameraNew.zoom = 30
    this.camera = cameraNew
    this.scene.add(this.camera)

    // ============================ 创建控制器
    const controlsNew = new OrbitControls(
      this.camera,
      this.renderer.domElement
    )
    controlsNew.enableDamping = false
    controlsNew.enableZoom = true
    controlsNew.enableRotate = false
    controlsNew.mouseButtons = { LEFT: THREE.MOUSE.PAN } // 鼠标中键平移
    controlsNew.screenSpacePanning = false // 定义平移时如何平移相机的位置 控制不上下移动
    controlsNew.listenToKeyEvents(viewerDom) // 监听键盘事件
    controlsNew.keys = { LEFT: 'KeyA', UP: 'KeyW', RIGHT: 'KeyD', BOTTOM: 'KeyS' }
    controlsNew.addEventListener('change', this.syncCameraState.bind(this))
    controlsNew.panSpeed = 1
    controlsNew.keyPanSpeed = 20 // normal 7
    controlsNew.minDistance = 0.1
    controlsNew.maxDistance = 1000
    this.controls = controlsNew

    this.camera.updateProjectionMatrix()

    this.syncCameraState()
  }

  offset = 0

  /**
   * 动画循环
   */
  animate() {
    this.animationFrameId = requestAnimationFrame(this.animate.bind(this))
    this.renderView()

    this.offset -= 0.002
    window['lineMaterial'].dashOffset = this.offset
  }

  /**
   * 渲染视图
   */
  renderView() {
    this.statsControls?.update()
    this.renderer?.render(this.scene, this.camera)

    this.css2DRenderer.render(this.scene, this.camera)
    this.css3DRenderer.render(this.scene, this.camera)
  }

  /**
   * 同步相机状态到全局状态
   */
  syncCameraState() {
    if (this.camera) {
      const camera = this.camera

      this.state.camera.position.x = camera.position.x
      this.state.camera.position.y = this.getEffectiveViewDistance()
      this.state.camera.position.z = camera.position.z
    }
  }

  /**
   * 计算相机到目标的有效视距
   */
  getEffectiveViewDistance() {
    if (!this.camera) {
      return 10
    }
    const camera = this.camera
    const viewHeight = (camera.top - camera.bottom) / camera.zoom
    // 假设我们希望匹配一个虚拟的透视相机（通常使用45度fov作为参考）
    const referenceFOV = 45 // 参考视场角
    return viewHeight / (2 * Math.tan(THREE.MathUtils.degToRad(referenceFOV) / 2))
  }

  handleResize(entries: any) {
    for (let entry of entries) {
      // entry.contentRect包含了元素的尺寸信息
      console.log('Element size changed:', entry.contentRect)

      const width = entry.contentRect.width
      const height = entry.contentRect.height

      if (this.camera instanceof THREE.PerspectiveCamera) {
        this.camera.aspect = width / height
        this.camera.updateProjectionMatrix()

      } else if (this.camera instanceof THREE.OrthographicCamera) {
        this.camera.left = width / -2
        this.camera.right = width / 2
        this.camera.top = height / 2
        this.camera.bottom = height / -2
        this.camera.updateProjectionMatrix()
      }

      this.renderer.setSize(width, height)
      this.css2DRenderer.setSize(width, height)
      this.css3DRenderer.setSize(width, height)
      break
    }
  }

  /**
   * 根据可视化范围更新网格的透明度
   */
  updateGridVisibility() {
    const cameraDistance = this.state.camera.position.y
    const maxVisibleDistance = 60 // 网格完全可见的最大距离
    const fadeStartDistance = 15  // 开始淡出的距离

    // 计算透明度（0~1）
    let opacity = 0.8
    if (cameraDistance > fadeStartDistance) {
      opacity = 0.8 - Math.min((cameraDistance - fadeStartDistance) / (maxVisibleDistance - fadeStartDistance) * 0.8, 0.8)
    }

    // 修改网格材质透明度
    this.gridHelper.material.opacity = opacity
    this.gridHelper.visible = opacity > 0
  }

  destroy() {
    this.state.isReady = false

    if (this.animationFrameId !== null) {
      cancelAnimationFrame(this.animationFrameId)
      this.animationFrameId = null
    }

    if (this.watchList) {
      _.forEach(this.watchList, (unWatchFn => {
        if (typeof unWatchFn === 'function') {
          unWatchFn()
        }
      }))
      this.watchList = []
    }

    if (this.tools) {
      for (const tool of this.tools) {
        if (tool.destory) {
          tool.destory()
        }
      }
      this.tools = []
    }

    if (this.resizeObserver) {
      this.resizeObserver.unobserve(this.viewerDom)
      this.resizeObserver.disconnect()
      this.resizeObserver = undefined
    }

    this.worldModel.unregisterViewport(this)

    if (this.statsControls) {
      this.statsControls.dom.remove()
    }

    if (this.renderer) {
      this.renderer.dispose()
      this.renderer.forceContextLoss()
      console.log('WebGL disposed, memory:', this.renderer.info.memory)
      this.renderer.domElement = null
    }
  }

  getIntersects(point: THREE.Vector2) {
    const mouse = new THREE.Vector2()
    mouse.set((point.x * 2) - 1, -(point.y * 2) + 1)
    this.raycaster.setFromCamera(mouse, this.camera)

    return this.raycaster.intersectObjects([this.gridHelper], false)
  }

  /**
   * 获取鼠标所在的 x,y,z 位置。
   * 鼠标坐标是相对于 canvas 元素 (renderer.domElement) 元素的
   */
  getClosestIntersection(e: MouseEvent) {
    const _point = new THREE.Vector2()
    _point.x = e.offsetX / this.renderer.domElement.offsetWidth
    _point.y = e.offsetY / this.renderer.domElement.offsetHeight

    const intersects = this.getIntersects(_point)
    if (intersects && intersects.length > 2) {
      const point = new THREE.Vector3(intersects[0].point.x, 0.1, intersects[1].point.z)

      return calcPositionUseSnap(e, point)
    }
    return null
  }
}

export interface ViewportState {
  /**
   * 当前楼层
   */
  currentFloor: string

  /**
   * 是否准备完成
   */
  isReady: boolean

  /**
   * 鼠标模式
   */
  cursorMode: CursorMode,

  /**
   * 选中的对象
   */
  selectedObject: THREE.Object3D | null

  /**
   * 相机状态
   */
  camera: {
    position: { x: number, y: number, z: number },
    rotation: { x: number, y: number, z: number }
  }

  /**
   * 鼠标位置(归一化坐标)
   */
  mouse: {
    /**
     * 鼠标在设计图上的坐标
     */
    x: number,
    z: number
  }
}