import panzoom from 'panzoom'
import { GenNonDuplicateID } from '../until'

const methods = {
  init () {
    this.jsPlumb.ready(() => {
      // 导入默认配置
      this.jsPlumb.importDefaults(this.jsplumbSetting)
      // 完成连线前的校验
      this.jsPlumb.bind('beforeDrop', evt => {
        let res = () => {} // 此处可以添加是否创建连接的校验， 返回 false 则不添加；
        return res
      })
      // 连线创建成功后，维护本地数据
      this.jsPlumb.bind('connection', evt => {
        this.addLine(evt)
      })
      // 连线双击删除事件
      this.jsPlumb.bind('dblclick', (conn, originalEvent) => {
        this.confirmDelLine(conn)
      })
      // 断开连线后，维护本地数据
      this.jsPlumb.bind('connectionDetached', evt => {
        this.deleLine(evt)
      })
      this.loadEasyFlow()
      // 会使整个jsPlumb立即重绘。
      this.jsPlumb.setSuspendDrawing(false, true)
    })
    this.initPanZoom()
  },
  // 加载流程图
  loadEasyFlow () {
    // 初始化节点
    for (let i = 0; i < this.data.nodeList.length; i++) {
      let node = this.data.nodeList[i]
      // 设置源点，可以拖出线连接其他节点
      this.jsPlumb.makeSource(node.id, this.jsplumbSourceOptions)
      // // 设置目标点，其他源点拖出的线可以连接该节点
      this.jsPlumb.makeTarget(node.id, this.jsplumbTargetOptions)
      // this.jsPlumb.draggable(node.id);
      this.draggableNode(node.id)
    }

    // 初始化连线
    this.jsPlumb.unbind('connection') // 取消连接事件
    for (let i = 0; i < this.data.lineList.length; i++) {
      let line = this.data.lineList[i]
      this.jsPlumb.connect(
        {
          source: line.from,
          target: line.to
        },
        this.jsplumbConnectOptions
      )
    }
    this.jsPlumb.bind('connection', evt => {
      let from = evt.source.id
      let to = evt.target.id
      this.data.lineList.push({
        from: from,
        to: to,
        label: '连线名称',
        id: GenNonDuplicateID(8),
        remark: ''
      })
    })
  },
  draggableNode (nodeId) {
    this.jsPlumb.draggable(nodeId, {
      grid: this.commonGrid,
      drag: params => {
        this.alignForLine(nodeId, params.pos)
      },
      start: () => {},
      stop: params => {
        this.auxiliaryLine.isShowXLine = false
        this.auxiliaryLine.isShowYLine = false
        this.changeNodePosition(nodeId, params.pos)
      }
    })
  },
  // 移动节点时，动态显示对齐线
  alignForLine (nodeId, position) {
    // eslint-disable-next-line one-var
    let showXLine = false,
      showYLine = false
    this.data.nodeList.some(el => {
      if (el.id !== nodeId && el.left === position[0] + 'px') {
        this.auxiliaryLinePos.x = position[0] + 60
        showYLine = true
      }
      if (el.id !== nodeId && el.top === position[1] + 'px') {
        this.auxiliaryLinePos.y = position[1] + 20 + 12.5 // 12.5是节点下方操作人显示栏的高度1/2
        showXLine = true
      }
    })
    this.auxiliaryLine.isShowYLine = showYLine
    this.auxiliaryLine.isShowXLine = showXLine
  },
  changeNodePosition (nodeId, pos) {
    this.data.nodeList.some(v => {
      if (nodeId === v.id) {
        v.left = pos[0] + 'px'
        v.top = pos[1] + 'px'
        return true
      } else {
        return false
      }
    })
  },
  drag (ele, item) {
    this.currentItem = item
  },
  drop (event) {
    const containerRect = this.jsPlumb.getContainer().getBoundingClientRect()
    const scale = this.getScale()
    let left = (event.pageX - containerRect.left - 60) / scale
    let top = (event.pageY - containerRect.top - 20) / scale

    var temp = {
      ...this.currentItem,
      id: GenNonDuplicateID(8),
      top: Math.round(top / 20) * 20 + 'px',
      left: Math.round(left / 20) * 20 + 'px'
    }
    this.addNode(temp)
  },
  addLine (line) {
    let from = line.source.id
    let to = line.target.id
    this.data.lineList.push({
      from: from,
      to: to,
      label: '连线名称',
      id: GenNonDuplicateID(8),
      remark: ''
    })
  },
  confirmDelLine (line) {
    // this.$Modal.confirm({
    //   title: '删除连线',
    //   content: "<p>确认删除该连线？</p>",
    //   onOk: () => {
    //     this.jsPlumb.deleteConnection(line)
    //   }
    // })
    this.$confirm('确认删除该连线?', '删除连线', {
      confirmButtonText: '确定',
      cancelButtonText: '取消',
      type: 'warning'
    })
      .then(() => {
        this.jsPlumb.deleteConnection(line)
      })
      .catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        })
      })
  },
  deleLine (line) {
    this.data.lineList.forEach((item, index) => {
      if (item.from === line.sourceId && item.to === line.targetId) {
        this.data.lineList.splice(index, 1)
      }
    })
  },
  // dragover默认事件就是不触发drag事件，取消默认事件后，才会触发drag事件
  allowDrop (event) {
    event.preventDefault()
  },
  getScale () {
    let scale1
    if (this.jsPlumb.pan) {
      const { scale } = this.jsPlumb.pan.getTransform()
      scale1 = scale
    } else {
      const matrix = window.getComputedStyle(this.jsPlumb.getContainer())
        .transform
      scale1 = matrix.split(', ')[3] * 1
    }
    this.jsPlumb.setZoom(scale1)
    return scale1
  },
  // 添加新的节点
  addNode (temp) {
    this.data.nodeList.push(temp)
    this.$nextTick(() => {
      this.jsPlumb.makeSource(temp.id, this.jsplumbSourceOptions)
      this.jsPlumb.makeTarget(temp.id, this.jsplumbTargetOptions)
      this.draggableNode(temp.id)
    })
  },

  initPanZoom () {
    const mainContainer = this.jsPlumb.getContainer()
    const mainContainerWrap = mainContainer.parentNode
    const pan = panzoom(mainContainer, {
      smoothScroll: false,
      bounds: true,
      // autocenter: true,
      zoomDoubleClickSpeed: 1,
      minZoom: 0.5,
      maxZoom: 2,
      // 设置滚动缩放的组合键，默认不需要组合键
      beforeWheel: e => {
        console.log(e)
        // let shouldIgnore = !e.ctrlKey
        // return shouldIgnore
      },
      beforeMouseDown: function (e) {
        // allow mouse-down panning only if altKey is down. Otherwise - ignore
        var shouldIgnore = e.ctrlKey
        return shouldIgnore
      }
    })
    this.jsPlumb.mainContainerWrap = mainContainerWrap
    this.jsPlumb.pan = pan
    // 缩放时设置jsPlumb的缩放比率
    pan.on('zoom', e => {
      const { x, y, scale } = e.getTransform()
      this.jsPlumb.setZoom(scale)
      // 根据缩放比例，缩放对齐辅助线长度和位置
      this.auxiliaryLinePos.width = (1 / scale) * 100 + '%'
      this.auxiliaryLinePos.height = (1 / scale) * 100 + '%'
      this.auxiliaryLinePos.offsetX = -(x / scale)
      this.auxiliaryLinePos.offsetY = -(y / scale)
    })
    pan.on('panend', e => {
      const { x, y, scale } = e.getTransform()
      this.auxiliaryLinePos.width = (1 / scale) * 100 + '%'
      this.auxiliaryLinePos.height = (1 / scale) * 100 + '%'
      this.auxiliaryLinePos.offsetX = -(x / scale)
      this.auxiliaryLinePos.offsetY = -(y / scale)
    })

    // 平移时设置鼠标样式
    mainContainerWrap.style.cursor = 'grab'
    mainContainerWrap.addEventListener('mousedown', function wrapMousedown () {
      this.style.cursor = 'grabbing'
      mainContainerWrap.addEventListener('mouseout', function wrapMouseout () {
        this.style.cursor = 'grab'
      })
    })
    mainContainerWrap.addEventListener('mouseup', function wrapMouseup () {
      this.style.cursor = 'grab'
    })
  },

  setNode (nodeId, node) {
    this.data.nodeList.some(v => {
      if (v.id === nodeId) {
        for (var key in node) {
          v[key] = node[key]
        }
        // v.nodeName = node.nodeName
        return true
      } else {
        return false
      }
    })
  },

  // 删除节点
  deleteNode (node) {
    this.data.nodeList.some((v, index) => {
      if (v.id === node.id) {
        this.data.nodeList.splice(index, 1)
        this.jsPlumb.remove(v.id)
        return true
      } else {
        return false
      }
    })
  },

  // 更改连线状态
  changeLineState (nodeId, val) {
    console.log(val)
    let lines = this.jsPlumb.getAllConnections()
    lines.forEach(line => {
      if (line.targetId === nodeId || line.sourceId === nodeId) {
        if (val) {
          line.canvas.classList.add('active')
        } else {
          line.canvas.classList.remove('active')
        }
      }
    })
  },

  // 初始化节点位置  （以便对齐,居中）
  fixNodesPosition () {
    if (this.data.nodeList && this.$refs.flowWrap) {
      const nodeWidth = 120
      const nodeHeight = 40
      let wrapInfo = this.$refs.flowWrap.getBoundingClientRect()
      // eslint-disable-next-line one-var
      let maxLeft = 0,
        minLeft = wrapInfo.width,
        maxTop = 0,
        minTop = wrapInfo.height
      let nodePoint = {
        left: 0,
        right: 0,
        top: 0,
        bottom: 0
      }
      // eslint-disable-next-line one-var
      let fixTop = 0,
        fixLeft = 0
      this.data.nodeList.forEach(el => {
        let top = Number(el.top.substring(0, el.top.length - 2))
        let left = Number(el.left.substring(0, el.left.length - 2))
        maxLeft = left > maxLeft ? left : maxLeft
        minLeft = left < minLeft ? left : minLeft
        maxTop = top > maxTop ? top : maxTop
        minTop = top < minTop ? top : minTop
      })
      nodePoint.left = minLeft
      nodePoint.right = wrapInfo.width - maxLeft - nodeWidth
      nodePoint.top = minTop
      nodePoint.bottom = wrapInfo.height - maxTop - nodeHeight

      fixTop =
        nodePoint.top !== nodePoint.bottom
          ? (nodePoint.bottom - nodePoint.top) / 2
          : 0
      fixLeft =
        nodePoint.left !== nodePoint.right
          ? (nodePoint.right - nodePoint.left) / 2
          : 0

      this.data.nodeList.map(el => {
        let top = Number(el.top.substring(0, el.top.length - 2)) + fixTop
        let left = Number(el.left.substring(0, el.left.length - 2)) + fixLeft
        el.top = Math.round(top / 20) * 20 + 'px'
        el.left = Math.round(left / 20) * 20 + 'px'
      })
    }
  }
}

export default methods