import React, { Component } from 'react'
import PropTypes from 'prop-types'
import cornerstone from 'cornerstone-core'
import cornerstoneTools from 'cornerstone-tools'
import getMeasurementLocationCallback from '../lib/getMeasurementLocationCallback'

import './ToolContextMenu.css'

const toolTypes = ['Angle', 'Length']

let defaultDropdownItems = [
  {
    actionType: 'Delete',
    action: ({ nearbyToolData, eventData }) => {
      const element = eventData.element

      cornerstoneTools.removeToolState(
        element,
        nearbyToolData.toolType,
        nearbyToolData.tool
      )
      cornerstone.updateImage(element)
    },
  },
  {
    actionType: 'setLabel',
    action: ({ nearbyToolData, eventData }) => {
      const { tool } = nearbyToolData

      const options = {
        skipAddLabelButton: true,
        editLocation: true,
      }

      getMeasurementLocationCallback(eventData, tool, options)
    },
  },
  {
    actionType: 'setDescription',
    action: ({ nearbyToolData, eventData }) => {
      const { tool } = nearbyToolData

      const options = {
        editDescriptionOnDialog: true,
      }

      getMeasurementLocationCallback(eventData, tool, options)
    },
  },
]

function getNearbyToolData(element, coords, toolTypes) {
  const nearbyTool = {}
  let pointNearTool = false

  toolTypes.forEach(toolType => {
    const toolData = cornerstoneTools.getToolState(element, toolType)
    if (!toolData) {
      return
    }

    toolData.data.forEach(function(data, index) {
      // TODO: Fix this, it's ugly
      let toolInterface = cornerstoneTools.getToolForElement(element, toolType)
      if (!toolInterface) {
        toolInterface = cornerstoneTools.getToolForElement(
          element,
          `${toolType}Tool`
        )
      }

      if (!toolInterface) {
        throw new Error('Tool not found.')
      }

      if (toolInterface.pointNearTool(element, data, coords)) {
        pointNearTool = true
        nearbyTool.tool = data
        nearbyTool.index = index
        nearbyTool.toolType = toolType
      }
    })

    if (pointNearTool) {
      return false
    }
  })

  return pointNearTool ? nearbyTool : undefined
}

function getDropdownItems(eventData, isTouchEvent = false, availableTools) {
  const nearbyToolData = getNearbyToolData(
    eventData.element,
    eventData.currentPoints.canvas,
    toolTypes,
    availableTools
  )

  // Annotate tools for touch events already have a press handle to edit it, has a better UX for deleting it
  if (
    isTouchEvent &&
    nearbyToolData &&
    nearbyToolData.toolType === 'arrowAnnotate'
  ) {
    return
  }

  let dropdownItems = []
  if (nearbyToolData) {
    defaultDropdownItems.forEach(function(item) {
      item.params = {
        eventData,
        nearbyToolData,
      }

      if (item.actionType === 'Delete') {
        item.text = 'Delete measurement'
      }

      if (item.actionType === 'setLabel') {
        item.text = 'Relabel'
      }

      if (item.actionType === 'setDescription') {
        item.text = `${
          nearbyToolData.tool.description ? 'Edit' : 'Add'
        } Description`
      }

      dropdownItems.push(item)
    })
  }

  return dropdownItems
}

class ToolContextMenu extends Component {
  static propTypes = {
    isTouchEvent: PropTypes.bool.isRequired,
    eventData: PropTypes.object,
    onClose: PropTypes.func,
    availableTools: PropTypes.array,
    visible: PropTypes.bool.isRequired,
  }

  static defaultProps = {
    visible: true,
    isTouchEvent: false,
  }

  constructor(props) {
    super(props)

    this.mainElement = React.createRef()
  }

  render() {
    if (!this.props.eventData) {
      return null
    }

    const { isTouchEvent, eventData, availableTools } = this.props
    const dropdownItems = getDropdownItems(
      eventData,
      isTouchEvent,
      availableTools
    )

    // Skip if there is no dropdown item
    if (!dropdownItems.length) {
      return ''
    }

    const dropdownComponents = dropdownItems.map(item => {
      const itemOnClick = event => {
        item.action(item.params)
        if (this.props.onClose) {
          this.props.onClose()
        }
      }

      return (
        <li key={item.actionType}>
          <button className="form-action" onClick={itemOnClick}>
            <span key={item.actionType}>{item.text}</span>
          </button>
        </li>
      )
    })

    const position = {
      top: `${eventData.currentPoints.canvas.y}px`,
      left: `${eventData.currentPoints.canvas.x}px`,
    }

    return (
      <div className="ToolContextMenu" style={position} ref={this.mainElement}>
        <ul className="bounded">{dropdownComponents}</ul>
      </div>
    )
  }

  componentDidMount = () => {
    if (this.mainElement.current) {
      this.updateElementPosition()
    }
  }

  componentDidUpdate = () => {
    if (this.mainElement.current) {
      this.updateElementPosition()
    }
  }

  updateElementPosition = () => {
    const {
      offsetParent,
      offsetTop,
      offsetHeight,
      offsetWidth,
      offsetLeft,
    } = this.mainElement.current

    const { eventData } = this.props

    if (offsetTop + offsetHeight > offsetParent.offsetHeight) {
      const offBoundPixels =
        offsetTop + offsetHeight - offsetParent.offsetHeight
      const top = eventData.currentPoints.canvas.y - offBoundPixels

      this.mainElement.current.style.top = `${top > 0 ? top : 0}px`
    }

    if (offsetLeft + offsetWidth > offsetParent.offsetWidth) {
      const offBoundPixels = offsetLeft + offsetWidth - offsetParent.offsetWidth
      const left = eventData.currentPoints.canvas.x - offBoundPixels

      this.mainElement.current.style.left = `${left > 0 ? left : 0}px`
    }
  }
}

export default ToolContextMenu