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              .container {
  position: relative;
  font-family: arial;
  width: 440px;
  margin: 0 auto;
}

.row {
  overflow: auto;
}

.cell {
  text-align: center;
  font-size: 12px;
  width: 20px;
  height: 20px;
  background-color: #dae8f2;
  float: left;
  border: 1px solid #ccc;
  border-color: #efefef #ccc #ccc #efefef;
  transition: background-color 0.25s linear;
  line-height: 20px;
  text-shadow: 1px 1px 0 rgba(255, 255, 255, 0.6);
}

.wall {
  background-color: #999;
}

.cell:not(.wall) {
  cursor: pointer;
}

.filled {
  background-color: #e3aad6;
}

.visited {
  background-color: #ff0;
}

.cell.path {
  background-color: #800;
  color: #fff;
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.6);
}

.container .cell.start-position,
.container .cell.target {
  background-color: #080;
  color: #fff;
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.6);
}

            
          
!
            
              # pathfinding
rng = new Chance 19930910
class Pathfinder
  constructor: (@gridData, @targetPosition, @fillCallback, @visitedCallback, @foundCallback) ->
    @width = @gridData[0].length
    @height = @gridData.length

  parseGridData: ->
    data = []
    for row, y in @gridData
      for cell, x in row
        index = y * @width + x
        node =
          open: !!cell
          visited: false
          index: 0
          x: x
          y: y
        data[index] = node
    data

  beginFill: (x, y) ->
    @startPosition = [x, y]
    @reset()
    @closeNode x, y
    @addNeighbors x, y
    @stepInterval = setInterval =>
      @nextStep()
    , 1000 / 60

  nextStep: ->
    if @open.length is 0
      clearInterval @stepInterval
      return
    [x, y] = @iToC @open.shift()
    @closeNode x, y
    @addNeighbors x, y

  addNeighbors: (x, y) ->
    {index} = @data[@cToI x, y]
    @addOpen x + 1, y, index
    @addOpen x - 1, y, index
    @addOpen x, y + 1, index
    @addOpen x, y - 1, index

  addOpen: (x, y, nodeIndex) ->
    index = @cToI x, y
    node = @data[index]
    if node.open
      if node.open
        @open.push index
        node.index = nodeIndex + 1
        node.open = false
        node.visited = true
        @visitedCallback x, y, node.index
    [tX, tY] = @targetPosition
    if x is tX and y is tY
      @targetFound()

  closeNode: (x, y) ->
    node = @data[@cToI x, y]
    node.open = false
    @fillCallback x, y, node.index

  targetFound: ->
    clearInterval @stepInterval
    @solutionPath = []
    @solutionPath.push @targetPosition
    while @walkSolution()
      true

  pathFound: ->
    path = @solutionPath.reverse()
    @foundCallback path

  walkSolution: ->
    [x, y] = @solutionPath[@solutionPath.length - 1]
    lastNode = @data[@cToI x, y]
    nextNode = @findLowestNeighbor lastNode.x, lastNode.y
    @solutionPath.push [nextNode.x, nextNode.y]
    if nextNode.index is 1
      @solutionPath.push @startPosition
      clearInterval @stepInterval
      @pathFound()
      return false
    true

  findLowestNeighbor: (x, y) ->
    candidateNode = @data[@cToI x, y]
    node = @data[@cToI x + 1, y]
    if node.visited and node.index < candidateNode.index
      candidateNode = node
    node = @data[@cToI x - 1, y]
    if node.visited and node.index < candidateNode.index
      candidateNode = node
    node = @data[@cToI x, y + 1]
    if node.visited and node.index < candidateNode.index
      candidateNode = node
    node = @data[@cToI x, y - 1]
    if node.visited and node.index < candidateNode.index
      candidateNode = node
    candidateNode

  reset: ->
    @open = []
    @data = @parseGridData()
    clearInterval @stepInterval

  cToI: (x, y) ->
    y * @width + x

  iToC: (index) ->
    x = index % @width
    y = Math.floor index / @width
    [x, y]

buildGrid = ($container, width, height) ->
  gridData = []
  for y in [0...height]
    gridData[y] = []
    $row = $ '<div>'
    $row.addClass 'row'
    for x in [0...width]
      isWall = rng.bool {likelihood: 30}
      if x is 0 or x is width - 1
        isWall = true
      if y is 0 or y is height - 1
        isWall = true
      $div = $ '<div>'
      $div.addClass 'cell'
      $div.attr 'id', "cell_#{x}_#{y}"
      $div.addClass 'wall' if isWall
      $row.append $div
      gridData[y].push +!isWall
    $container.append $row
  gridData

gridData = buildGrid $('#container'), 20, 20

closeCallback = (x, y, index) ->
  $cell = $ "#cell_#{x}_#{y}"
  $cell.removeClass 'visited'
  $cell.addClass 'filled'
  $cell.text index

visitedCallback = (x, y, index) ->
  $cell = $ "#cell_#{x}_#{y}"
  $cell.addClass 'visited'
  $cell.text index

foundCallback = (path) ->
  for [x, y] in path
    $cell = $ "#cell_#{x}_#{y}"
    $cell.addClass 'path'

targetPosition = [6, 1]
pathfinder = new Pathfinder gridData, targetPosition, closeCallback, visitedCallback, foundCallback

[x, y] = targetPosition
$("#cell_#{x}_#{y}").addClass 'target'

$('#container').on 'click', '.cell', (event) ->
  $cell = $ event.target
  isWall = $cell.hasClass 'wall'
  id = $cell.attr 'id'
  unless isWall
    [x, y] = id.match /\d+/g
    $('.filled').removeClass 'filled'
    $('.visited').removeClass 'visited'
    $('.path').removeClass 'path'
    $('.start-position').removeClass 'start-position'
    $cell.addClass 'start-position'
    $('.cell').text ''
    pathfinder.beginFill +x, +y

            
          
!
999px
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