import fabric  from '../../js/fabric-adapter'

import del from './images/sc.svg'
import rotate from './images/xz.svg'
import symmetry from './images/jx.svg'
import jia from './images/jia.svg'
import jian from './images/jian.svg'
import pingpu from './images/pingpu.svg'
import { uploadBaseImg } from '@/apis/other'
export default  {
  data() {
    return {
      action: 'select',
      drawWidth: 20,
      eraseOpacity:1, //橡皮擦 透明度
      min: 2,
      max: 80,
      color: '#ffffff',

      //撤销
      canvasState: [],//操作记录
      stateIndex: -1,
      canUndoState:false,

      //画笔在层上操作
      group:null,
      arr:[],
    }
  },

  props: {
    toolConfig: {
      type: Array,
      default: () => ['select','color','draw','eraser','empty','undo']
    },
    controlToolConfig: {
      type: Array,
      default: () => ['del','rotate','symmetry']
    },
    defaultColor:{ //画笔默认颜色
      type: String,
      default:'#ffffff'
    }
  },
  computed: {
    //是否可以撤销
    canUndo() {
      return this.stateIndex >= 0;
    },
  },
  watch: {
    action(val,old){
      if(old==='color' && this.showStraw){
        this.hideColorXg()
      }
    },
    drawWidth() {
      if (this.fcanvas){
        this.fcanvas.freeDrawingBrush.width = this.drawWidth
        this.setCursor()
      }
    },
    color() {
      if (this.fcanvas) {
        this.fcanvas.freeDrawingBrush.color = this.color
        this.toDraw()
      }
    },
    eraseOpacity(){

      if (this.fcanvas) {
        this.fcanvas.freeDrawingBrush.opacity = this.eraseOpacity
        this.setCursor()
      }
    }
  },
  created() {
    this.color = this.defaultColor
  },
  activated() {
    //设置控件 添加镜像删除等icon
    this.setControlTool();
  },
  mounted() {
    //设置控件 添加镜像删除等icon
    this.setControlTool();

  },

  methods: {
    actionInit(){
      //监听撤销
      if(this.toolConfig.includes('undo')){
        this.setUndo()
      }
      //修改画笔 每次在此图层上操作
      if(this.toolConfig.includes('draw')){
        this.fcanvas.on('path:created', (opt)=>{

          if(this.action === 'erase') {
            this.selected.map(item=>{
              this.updateLayerCover(item)
            })
            this.getLayers()
            return;
          }
          if(this.action !== 'draw') return;
          let object = this.fcanvas.getObjects()
          let path = object[object.length-1]
          let selected = []
          let name = 'pencli'
          let sort = null
          let id = null
          if(this.selected.length === 1){
            name = this.selected[0].name
            sort = this.selected[0].sort
            id = this.selected[0].id
            selected = this.selected
          }else{
            id = this.getNextLayersId()
            sort = this.getNextLayersSort()
          }
          selected.push(path)

          var sel = new fabric.ActiveSelection(selected, {
            canvas: this.fcanvas,
          });

          this.fcanvas.setActiveObject(sel);

         // this.canUndoState = true;
          const group = this.fcanvas.getActiveObject().toGroup();
          group.setControlsVisibility({
            'mtr':false,
          })
          group.set({
            name,
            sort,
            id,
            erasable:false,
          })
          group.moveTo(sort)
          this.fcanvas.discardActiveObject()
          this.selected = [group]
         // this.updateCanvasState();
          this.getLayers()
        })

      }

      this.fcanvas.on('mouse:down', (opt)=>{
        if(this.action !== 'erase') return;
        this.toEraseInLayer();

      })
      //设置默认笔画
      setTimeout(() => {
        this.fcanvas.freeDrawingBrush.width = this.drawWidth
        this.fcanvas.freeDrawingBrush.color = this.color
      }, 100)

    },

    // 新增图片图层
    async addMaps(url, options = {
      left:50,
      bottom:50,
    }, ) {

      return  new Promise((resolve, reject) => {

        if(!this.fcanvas.add){
          reject(false);
        }
        fabric.Image.fromURL(url, (img) => {


          let sort =  options.sort || this.getNextLayersSort()
          let erasable =  options.erasable === false ? false : true
          let selectable =  options.selectable === false ? false : true
          let id = this.getNextLayersId()
          this.fcanvas.discardActiveObject()
          img.setControlsVisibility({
            'mtr':false,
          })

          this.fcanvas.add(img.set({
            name:"image",
            ...options,
            sort,
            id,
            erasable:erasable,

          }))
          img.moveTo(sort)
          if(img.getScaledWidth() > options.maxWidth){
            let zoom = this.fcanvas.getZoom()
            img.scaleToWidth(options.maxWidth * this.fcanvas.getZoom())
          }
          if(img.getScaledHeight() > options.maxHeight){
            img.scaleToHeight(options.maxHeight * this.fcanvas.getZoom())
          }
         if(selectable)  this.fcanvas.setActiveObject(img)
          this.toSelect()
          this.getLayers()
          if(selectable) this.select(img)
          this.fcanvas.renderAll();
          console.log(img)
          resolve(img)
        }, {
          crossOrigin: 'anonymous',
        })
      })
    },
    //新增  svg
    addSvg(url, options = {
      left:50,
      top:50,
      width:200,
      height:200
    },){
      if(!this.fcanvas.add){
        return;
      }

      fabric.loadSVGFromURL(url, (objects,options) => {
        const svg = fabric.util.groupSVGElements(objects, options);
        let sort =  options.sort || this.getNextLayersSort()
        let erasable =  options.erasable ||  false
        let id = this.getNextLayersId()
        this.fcanvas.discardActiveObject()
        svg.setControlsVisibility({
          'mtr':false,
        })

        this.fcanvas.add(svg.set({
          ...options,
          name:"svg",
          sort,
          id,
          erasable:erasable,

        }))
        svg.moveTo(sort)
        this.fcanvas.setActiveObject(svg)
        this.toSelect()
        this.getLayers()
        this.select(svg)
        this.fcanvas.renderAll();
      })

    },
    //新增文字图层
    addText( options = {
      left:50,
      top:50,
    },){

      if(!this.fcanvas.add){
        return;
      }
      const textbox = new fabric.Textbox('', {
        left: 50,
        top: 50,
        width: 150,
        fontSize: 20
      });

      let sort =  options.sort || this.getNextLayersSort()
      let erasable =  options.erasable ||  false
      let id = this.getNextLayersId()
      this.fcanvas.discardActiveObject()
      this.fcanvas.add(textbox.set({
        ...options,
        name:"text",
        sort,
        id,
        erasable:erasable,

      }))
      textbox.moveTo(sort)
      this.fcanvas.setActiveObject(textbox)
      this.toSelect()
      this.getLayers()
      this.select(textbox)
      textbox.enterEditing();
      this.fcanvas.renderAll();
    },
    // 选择
    toSelect() {
      this.action = 'select'
      this.fcanvas.isDrawingMode = false
    },
    async setCursor(){
      if(!['draw','erase'].includes(this.action))  return
      let fcanvasZoom =  this.fcanvas.getZoom()
      let deviceZoom =  detectZoom.device()
      let zoom = fcanvasZoom/deviceZoom;
      const canvas = document.createElement('canvas')
      const fcanvas = new fabric.Canvas(canvas, {
        containerClass:"fcanvas",
        // 元素对象被选中时保持在当前z轴，不会跳到最顶层
        preserveObjectStacking:true,
        width: this.drawWidth*zoom,
        height: this.drawWidth*zoom,
      })
      const color =   this.action === 'draw' ? this.color : '#ffffff';
      var rect = new fabric.Circle({
        radius: (this.drawWidth*zoom)/2,
        fill:color,
        left: 0,
        opacity: 1,
        strokeWidth: 0,
        strokeUniform: true
      });
      fcanvas.add(rect);
      const base64 = await fcanvas.toDataURL({
        format: 'png',
        enableRetinaScaling: true
      })
      this.fcanvas.freeDrawingCursor = `url( ${base64} ) ${(this.drawWidth*fcanvasZoom)/2} ${(this.drawWidth*fcanvasZoom)/2}, auto`;

    },
    // 画笔
    toDraw() {
      this.action = 'draw'
      this.fcanvas.freeDrawingBrush = new fabric.PencilBrush(this.fcanvas)
      this.fcanvas.freeDrawingBrush.canvas.selectable = false;
      this.setFreeDrawingBrushStyle()
      this.setCursor()
      this.fcanvas.renderAll();
    },
    // 橡皮擦
    toErase() {
      this.action = 'erase'
      console.log(this.fcanvas.getObjects())
      this.fcanvas.freeDrawingBrush = new fabric.EraserBrush(this.fcanvas)
      this.toEraseInLayer();
      this.setFreeDrawingBrushStyle()
      this.setCursor()
    },
    //拖拽
    toDrag(){
      this.action = 'drag'
      this.fcanvas.isDrawingMode = false
      this.fcanvas.hoverCursor = 'grab'
    },
    //设置橡皮擦作用图层
    toEraseInLayer(){
      this.fcanvas.getObjects().map(item=>{
        if(this.selectedIds.includes(item.id)){
          item.set({
            erasable:true,
          })
        }else{
          item.set({
            erasable:false,
          })
        }
      })
    },

    // 清空
    setEmpty() {
      this.fcanvas.remove.apply(this.fcanvas, this.fcanvas.getObjects())
      this.getLayers()
      this.undoAfterSelectLayers();
    },
    //合并组
    toGroup(){
      this.fcanvas.getActiveObject().toGroup();
      this.fcanvas.requestRenderAll();
    },
    // 设置画笔样式
    setFreeDrawingBrushStyle() {
      if (!this.fcanvas) return
      this.fcanvas.freeDrawingBrush.width = this.drawWidth
      this.fcanvas.freeDrawingBrush.color = this.color
      this.fcanvas.freeDrawingBrush.opacity = this.eraseOpacity
      this.fcanvas.isDrawingMode = true
    },
    //设置控件
    setControlTool(){
      let self = this;
      //修改 controls 默认样式
      fabric.Object.prototype.transparentCorners = false;
      fabric.Object.prototype.cornerColor = '#333333';
      fabric.Object.prototype.cornerStrokeColor = '#333333';
      fabric.Object.prototype.borderColor = '#000000';
      fabric.Object.prototype.cornerStyle = 'circle';
      fabric.Textbox.prototype.transparentCorners = false;
      fabric.Textbox.prototype.cornerColor = '#333333';
      fabric.Textbox.prototype.cornerStrokeColor = '#333333';
      fabric.Textbox.prototype.borderColor = '#000000';
      fabric.Textbox.prototype.cornerStyle = 'circle';

      //删除控件， 每次 重新计算
      let controlToolConfigFun = {
        del:'deleteControl',
        rotate:'rotateControl',
        tile:"tileControl",
        tileIconjian:"tileIconjianControl",
        symmetry:'symmetryControl',
      }


      Object.keys(controlToolConfigFun).map(item=>{
        delete fabric.Object.prototype.controls[controlToolConfigFun[item]]
        delete fabric.Textbox.prototype.controls[controlToolConfigFun[item]]
      })

      delete fabric.Object.prototype.controls.tileIconppControl
      delete fabric.Textbox.prototype.controls.tileIconppControl



      if(this.controlToolConfig.includes('del')) setToolDel()
      if(this.controlToolConfig.includes('rotate')) setToolRotate()
      if(this.controlToolConfig.includes('symmetry')) setToolSymmetry()
      if(this.controlToolConfig.includes('tile')) setTooTile()





      // 增加图标
      function renderIcon(icon) {
        return function renderIcon(ctx, left, top, styleOverride, fabricObject) {
          var size = this.cornerSize
          ctx.save()
          ctx.translate(left, top)
          ctx.rotate(fabric.util.degreesToRadians(fabricObject.angle))
          ctx.drawImage(icon, -size / 2, -size / 2, size, size)
          ctx.restore()
        }
      }
      // 删除
      function setToolDel() {
        var icon = document.createElement('img')
        icon.src = del
        icon.title = '删除'
        fabric.Object.prototype.controls.deleteControl = new fabric.Control({
          x: -0.5,
          y: -0.5,
          offsetY: -25,
          cursorStyle:"Pointer",
          mouseUpHandler: deleteObject,
          render: renderIcon(icon),
          cornerSize: 20
        })
        fabric.Textbox.prototype.controls.deleteControl = fabric.Object.prototype.controls.deleteControl

        function deleteObject(eventData, transform) {
          try {
            var target = transform.target
            var canvas = target.canvas
            if(target.delable === false){
              self.$message.warning('该元素无法被删除')
              return;
            }

            canvas.remove(target)
            if(target.hasOwnProperty('_objects') && target.name !== 'svg'){
              target._objects.map(item=>{
                if(item.delable !== false){
                  canvas.remove(item)
                }
              })
              canvas.discardActiveObject()
            }

            canvas.requestRenderAll()
            self.getLayers()
            self.undoAfterSelectLayers();

          }catch (e) {
            console.log(e)
          }
        }
      }
      // 旋转
      function setToolRotate() {
        var icon = document.createElement('img')
        icon.src = rotate
        icon.title = '旋转'
        fabric.Object.prototype.controls.rotateControl = new fabric.Control({
          x: 0,
          y: -0.5,
          actionHandler: fabric.controlsUtils.rotationWithSnapping,
          cursorStyleHandler: fabric.controlsUtils.rotationStyleHandler,
          offsetY: -40,
          withConnection: true,
          actionName: 'rotate',
          // 渲染图标
          cursorStyle:"Pointer",
          render: renderIcon(icon),
          // 设置控制点大小
          cornerSize: 20
        })
        fabric.Textbox.prototype.controls.rotateControl = fabric.Object.prototype.controls.rotateControl

      }
      // 镜像
      function setToolSymmetry() {
        let icon = document.createElement('img')
        icon.src = symmetry
        icon.title = '镜像'
        fabric.Object.prototype.controls.symmetryControl = new fabric.Control({
          x: 0.5,
          y: -0.5,
          offsetY: -25,
          offsetX: 0,
          cursorStyle:"Pointer",
          mouseUpHandler: deleteObject,
          render: renderIcon(icon),
          cornerSize: 20
        })
        fabric.Textbox.prototype.controls.symmetryControl = fabric.Object.prototype.controls.symmetryControl

        function deleteObject(eventData, transform) {
          var target = transform.target
          target.set({
            flipX:!target.flipX,
          })
          var canvas = target.canvas
          self.updateCanvasState()
          canvas.requestRenderAll()
        }
      }
      // 平铺
      function setTooTile() {


        let iconpp = document.createElement('img')
        iconpp.src = pingpu
        iconpp.title = '平铺'
        fabric.Object.prototype.controls.tileIconppControl = new fabric.Control({
          x: -0.5,
          y: -0.5,
          offsetX: 30,
          offsetY: -25,
          cursorStyle:"default",
          render: renderIcon(iconpp),
          cornerSize: 60
        })

        let icon = document.createElement('img')
        icon.src = jia
        icon.title = '平铺加'
        fabric.Object.prototype.controls.tileControl = new fabric.Control({
          x: -0.5,
          y: -0.5,
          offsetX: 60,
          offsetY: -25,
          cursorStyle:"Pointer",
          mouseUpHandler: tileObject,
          render: renderIcon(icon),
          cornerSize: 20
        })


        let iconjian = document.createElement('img')
        iconjian.src = jian
        iconjian.title = '平铺减'
        fabric.Object.prototype.controls.tileIconjianControl = new fabric.Control({
          x: -0.5,
          y: -0.5,
          offsetX: 0,
          offsetY: -25,
          cursorStyle:"Pointer",
          mouseUpHandler: tileObject,
          render: renderIcon(iconjian),
          cornerSize: 20
        })




        async function tileObject(eventData, transform) {
          var target = transform.target
          if(target.name  !== 'image' || !target.tile ) return;


          if(target.tile.src){

            let multiple = target.tile.multiple + 1

            if(transform.corner === 'tileIconjianControl'){
              if(target.tile.multiple  === 1){
                self.$message.error('无法在放大/缩小了')
                return
              }
              multiple = Math.max(target.tile.multiple - 1,1)
            }else{
              if(target.tile.multiple  === 20){
                self.$message.error('无法在放大/缩小了')
                return
              }
            }



            let thisOssOptios = {
             ...target.tile.ossOptios,
              w:parseInt((target.tile.ossOptios.w)/multiple),
              h:parseInt((target.tile.ossOptios.h)/multiple)
            }
            let multipleImgSrc =  self.$appfun.ossResize(target.tile.src,thisOssOptios)
            const image = await self.$appfun.loadingImg(multipleImgSrc)
            const canvas = document.createElement('canvas')

            canvas.width = target.width
            canvas.height = target.height
            const ctx = canvas.getContext('2d')
            var pat = ctx.createPattern(image,"repeat");
            ctx.rect(0,0,canvas.width,canvas.height);
            ctx.fillStyle = pat;
            ctx.fill();
            const url = canvas.toDataURL('image/png')
            target.setSrc(url,()=>{
              target.tile.multiple  = multiple
              self.updateCanvasState()
              target.canvas.requestRenderAll()
            })
          }
        }
      }
    },
    //撤销
    historyState(index){
      if (this.canUndo) {
        this.canUndoState = true;
        this.fcanvas.loadFromJSON(this.canvasState[index], () => {
          this.fcanvas.renderAll();
          this.stateIndex = index;
          this.canvasState.splice(this.stateIndex+1);
          this.getLayers()
          this.undoAfterSelectLayers();
          this.canUndoState = false;
         });
      }
    },
    setUndo(){
      //监听撤销
      this.fcanvas.on("object:modified", ()=>{
        this.updateCanvasState()
      });
    },
    updateCanvasState(e) {
      if (!this.canUndoState) {
        const canvasAsJson = JSON.stringify(this.fcanvas.toJSON(['name','sort','mtr','id','selectable','erasable']));
        this.canvasState.splice(this.stateIndex+1);
        this.canvasState.push(canvasAsJson);
        this.stateIndex = this.canvasState.length - 1;
       //  if(this.viewStatus) this.updateMiniMap();

      } else {
        this.canUndoState = false;
      }
    },


  }

}