React = require 'react'
_ = require 'lodash'
Animation = require 'ainojs-animation'
easing = require 'ainojs-easing'

{svg, path, div} = React.DOM

Chevron = React.createClass

  displayName: 'Chevron'    

  getDefaultProps: ->
    {
      onClick: -> # method to handle clicks
      positionClass: null # and additionaly class to add for positioning the element
      invertOnClick: no # whether or not to invert to the opposite position on clicks
      defaultOrientation: 'down' # or 'up, 'left, 'right' - which way the chevron points by default
      isInverted: no # tells the widget to invert, either on mount or afterwards
      animationDuration: 200
      color: "#37BAC4"
    }

  default:
    d1: 4
    d2: -4
    d3: 6
    d4: -4
    d5: 0
    d6: 4

  inverted:
    d1: 0
    d2: 4
    d3: 2
    d4: 4
    d5: 4
    d6: -4


  render: ->
    {positionClass, onClick, defaultOrientation, color} = @props

    {d1, d2, d3, d4, d5, d6} = @state
    dAttr = "M4 #{d1}l5 #{d2}v2L4 #{d3}l-5 #{d4}V#{d5}l5 #{d6}z"
    
    className = 'chevron'
    className += " #{defaultOrientation}"
    className += " #{positionClass}" if positionClass?
    
    div {
      className: className
      onClick: @handleClick
    }, svg {
      className: 'chevron-svg'
      width: "10"
      height: "6"
      viewBox:"-1 0 10 6"
    }, path {fill: color, d: dAttr}

  getInitialState: ->
    @isInverted = @props.isInverted
    
    if @isInverted then @inverted
    else @default

  componentDidMount: ->
    @animation = new Animation 
      duration: @props.animationDuration
      easing: easing 'linear'
    .on('frame', @onFrame)

  componentWillReceiveProps: (nextProps) ->
    if nextProps.isInverted isnt @isInverted
      @animate() if @props.invertOnClick

  componentWillUnmount: -> 
    @animation.end() if @animation?.isAnimating()
    @animation.destroy()

  onFrame: (e) ->
    if @isMounted() then @setState e.values


  handleClick: (e) -> 
    e.stopPropagation()
    
    @props.onClick?()

    @animate() if @props.invertOnClick



  animate: ->
    @isInverted = not @isInverted

    # Note: need to clone here so animate class does not alter initial values
    stateStart = _.clone(@state)
    stateEnd = _.clone(if @isInverted then @inverted else @default)
    
    # Note: Not feeding init @state directly, because that will clobber @state properties not being animated
    @animation.init stateStart
    @animation.animateTo stateEnd

    

    


module.exports = Chevron