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class Morris.Grid extends Morris.EventEmitter

  # A generic pair of axes for line/area/bar charts.

  #

  # Draws grid lines and axis labels.

  #

  constructor: (options) ->

    # find the container to draw the graph in

    if typeof options.element is 'string'

      @el = $ document.getElementById(options.element)

    else

      @el = $ options.element

    if not @el? or @el.length == 0

      throw new Error("Graph container element not found")

    if @el.css('position') == 'static'

      @el.css('position', 'relative')

    @options = $.extend {}, @gridDefaults, (@defaults || {}), options

    # backwards compatibility for units -> postUnits

    if typeof @options.units is 'string'

      @options.postUnits = options.units

    # the raphael drawing instance

    @raphael = new Raphael(@el[0])

    # some redraw stuff

    @elementWidth = null

    @elementHeight = null

    @dirty = false

    # range selection

    @selectFrom = null

    # more stuff

    @init() if @init

    # load data

    @setData @options.data

    # hover

    @el.bind 'mousemove', (evt) =>

      offset = @el.offset()

      x = evt.pageX - offset.left

      if @selectFrom

        left = @data[@hitTest(Math.min(x, @selectFrom))]._x

        right = @data[@hitTest(Math.max(x, @selectFrom))]._x

        width = right - left

        @selectionRect.attr({ x: left, width: width })

      else

        @fire 'hovermove', x, evt.pageY - offset.top

    @el.bind 'mouseleave', (evt) =>

      if @selectFrom

        @selectionRect.hide()

        @selectFrom = null

      @fire 'hoverout'

    @el.bind 'touchstart touchmove touchend', (evt) =>

      touch = evt.originalEvent.touches[0] or evt.originalEvent.changedTouches[0]

      offset = @el.offset()

      @fire 'hovermove', touch.pageX - offset.left, touch.pageY - offset.top

    @el.bind 'click', (evt) =>

      offset = @el.offset()

      @fire 'gridclick', evt.pageX - offset.left, evt.pageY - offset.top

    if @options.rangeSelect

      @selectionRect = @raphael.rect(0, 0, 0, @el.innerHeight())

        .attr({ fill: @options.rangeSelectColor, stroke: false })

        .toBack()

        .hide()

      @el.bind 'mousedown', (evt) =>

        offset = @el.offset()

        @startRange evt.pageX - offset.left

      @el.bind 'mouseup', (evt) =>

        offset = @el.offset()

        @endRange evt.pageX - offset.left

        @fire 'hovermove', evt.pageX - offset.left, evt.pageY - offset.top

    if @options.resize

      $(window).bind 'resize', (evt) =>

        if @timeoutId?

          window.clearTimeout @timeoutId

        @timeoutId = window.setTimeout @resizeHandler, 100

    # Disable tap highlight on iOS.

    @el.css('-webkit-tap-highlight-color', 'rgba(0,0,0,0)')

    @postInit() if @postInit

  # Default options

  #

  gridDefaults:

    dateFormat: null

    axes: true

    grid: true

    gridLineColor: '#aaa'

    gridStrokeWidth: 0.5

    gridTextColor: '#888'

    gridTextSize: 12

    gridTextFamily: 'sans-serif'

    gridTextWeight: 'normal'

    hideHover: false

    yLabelFormat: null

    xLabelAngle: 0

    numLines: 5

    padding: 25

    parseTime: true

    postUnits: ''

    preUnits: ''

    ymax: 'auto'

    ymin: 'auto 0'

    goals: []

    goalStrokeWidth: 1.0

    goalLineColors: [

      '#666633'

      '#999966'

      '#cc6666'

      '#663333'

    ]

    events: []

    eventStrokeWidth: 1.0

    eventLineColors: [

      '#005a04'

      '#ccffbb'

      '#3a5f0b'

      '#005502'

    ]

    rangeSelect: null

    rangeSelectColor: '#eef'

    resize: false

  # Update the data series and redraw the chart.

  #

  setData: (data, redraw = true) ->

    @options.data = data

    if !data? or data.length == 0

      @data = []

      @raphael.clear()

      @hover.hide() if @hover?

      return

    ymax = if @cumulative then 0 else null

    ymin = if @cumulative then 0 else null

    if @options.goals.length > 0

      minGoal = Math.min @options.goals...

      maxGoal = Math.max @options.goals...

      ymin = if ymin? then Math.min(ymin, minGoal) else minGoal

      ymax = if ymax? then Math.max(ymax, maxGoal) else maxGoal

    @data = for row, index in data

      ret = {src: row}

      ret.label = row[@options.xkey]

      if @options.parseTime

        ret.x = Morris.parseDate(ret.label)

        if @options.dateFormat

          ret.label = @options.dateFormat ret.x

        else if typeof ret.label is 'number'

          ret.label = new Date(ret.label).toString()

      else

        ret.x = index

        if @options.xLabelFormat

          ret.label = @options.xLabelFormat ret

      total = 0

      ret.y = for ykey, idx in @options.ykeys

        yval = row[ykey]

        yval = parseFloat(yval) if typeof yval is 'string'

        yval = null if yval? and typeof yval isnt 'number'

        if yval?

          if @cumulative

            total += yval

          else

            if ymax?

              ymax = Math.max(yval, ymax)

              ymin = Math.min(yval, ymin)

            else

              ymax = ymin = yval

        if @cumulative and total?

          ymax = Math.max(total, ymax)

          ymin = Math.min(total, ymin)

        yval

      ret

    if @options.parseTime

      @data = @data.sort (a, b) -> (a.x > b.x) - (b.x > a.x)

    # calculate horizontal range of the graph

    @xmin = @data[0].x

    @xmax = @data[@data.length - 1].x

    @events = []

    if @options.events.length > 0

      if @options.parseTime

        @events = (Morris.parseDate(e) for e in @options.events)

      else

        @events = @options.events

      @xmax = Math.max(@xmax, Math.max(@events...))

      @xmin = Math.min(@xmin, Math.min(@events...))

    if @xmin is @xmax

      @xmin -= 1

      @xmax += 1

    @ymin = @yboundary('min', ymin)

    @ymax = @yboundary('max', ymax)

    if @ymin is @ymax

      @ymin -= 1 if ymin

      @ymax += 1

    if @options.axes in [true, 'both', 'y'] or @options.grid is true

      if (@options.ymax == @gridDefaults.ymax and

          @options.ymin == @gridDefaults.ymin)

        # calculate 'magic' grid placement

        @grid = @autoGridLines(@ymin, @ymax, @options.numLines)

        @ymin = Math.min(@ymin, @grid[0])

        @ymax = Math.max(@ymax, @grid[@grid.length - 1])

      else

        step = (@ymax - @ymin) / (@options.numLines - 1)

        @grid = (y for y in [@ymin..@ymax] by step)

    @dirty = true

    @redraw() if redraw

  yboundary: (boundaryType, currentValue) ->

    boundaryOption = @options["y#{boundaryType}"]

    if typeof boundaryOption is 'string'

      if boundaryOption[0..3] is 'auto'

        if boundaryOption.length > 5

          suggestedValue = parseInt(boundaryOption[5..], 10)

          return suggestedValue unless currentValue?

          Math[boundaryType](currentValue, suggestedValue)

        else

          if currentValue? then currentValue else 0

      else

        parseInt(boundaryOption, 10)

    else

      boundaryOption

  autoGridLines: (ymin, ymax, nlines) ->

    span = ymax - ymin

    ymag = Math.floor(Math.log(span) / Math.log(10))

    unit = Math.pow(10, ymag)

    # calculate initial grid min and max values

    gmin = Math.floor(ymin / unit) * unit

    gmax = Math.ceil(ymax / unit) * unit

    step = (gmax - gmin) / (nlines - 1)

    if unit == 1 and step > 1 and Math.ceil(step) != step

      step = Math.ceil(step)

      gmax = gmin + step * (nlines - 1)

    # ensure zero is plotted where the range includes zero

    if gmin < 0 and gmax > 0

      gmin = Math.floor(ymin / step) * step

      gmax = Math.ceil(ymax / step) * step

    # special case for decimal numbers

    if step < 1

      smag = Math.floor(Math.log(step) / Math.log(10))

      grid = for y in [gmin..gmax] by step

        parseFloat(y.toFixed(1 - smag))

    else

      grid = (y for y in [gmin..gmax] by step)

    grid

  _calc: ->

    w = @el.width()

    h = @el.height()

    if @elementWidth != w or @elementHeight != h or @dirty

      @elementWidth = w

      @elementHeight = h

      @dirty = false

      # recalculate grid dimensions

      @left = @options.padding

      @right = @elementWidth - @options.padding

      @top = @options.padding

      @bottom = @elementHeight - @options.padding

      if @options.axes in [true, 'both', 'y']

        yLabelWidths = for gridLine in @grid

          @measureText(@yAxisFormat(gridLine)).width

        @left += Math.max(yLabelWidths...)

      if @options.axes in [true, 'both', 'x']

        bottomOffsets = for i in [0...@data.length]

          @measureText(@data[i].text, -@options.xLabelAngle).height

        @bottom -= Math.max(bottomOffsets...)

      @width = Math.max(1, @right - @left)

      @height = Math.max(1, @bottom - @top)

      @dx = @width / (@xmax - @xmin)

      @dy = @height / (@ymax - @ymin)

      @calc() if @calc

  # Quick translation helpers

  #

  transY: (y) -> @bottom - (y - @ymin) * @dy

  transX: (x) ->

    if @data.length == 1

      (@left + @right) / 2

    else

      @left + (x - @xmin) * @dx

  # Draw it!

  #

  # If you need to re-size your charts, call this method after changing the

  # size of the container element.

  redraw: ->

    @raphael.clear()

    @_calc()

    @drawGrid()

    @drawGoals()

    @drawEvents()

    @draw() if @draw

  # @private

  #

  measureText: (text, angle = 0) ->

    tt = @raphael.text(100, 100, text)

      .attr('font-size', @options.gridTextSize)

      .attr('font-family', @options.gridTextFamily)

      .attr('font-weight', @options.gridTextWeight)

      .rotate(angle)

    ret = tt.getBBox()

    tt.remove()

    ret

  # @private

  #

  yAxisFormat: (label) -> @yLabelFormat(label)

  # @private

  #

  yLabelFormat: (label) ->

    if typeof @options.yLabelFormat is 'function'

      @options.yLabelFormat(label)

    else

      "#{@options.preUnits}#{Morris.commas(label)}#{@options.postUnits}"

  # draw y axis labels, horizontal lines

  #

  drawGrid: ->

    return if @options.grid is false and @options.axes not in [true, 'both', 'y']

    for lineY in @grid

      y = @transY(lineY)

      if @options.axes in [true, 'both', 'y']

        @drawYAxisLabel(@left - @options.padding / 2, y, @yAxisFormat(lineY))

      if @options.grid

        @drawGridLine("M#{@left},#{y}H#{@left + @width}")

  # draw goals horizontal lines

  #

  drawGoals: ->

    for goal, i in @options.goals

      color = @options.goalLineColors[i % @options.goalLineColors.length]

      @drawGoal(goal, color)

  # draw events vertical lines

  drawEvents: ->

    for event, i in @events

      color = @options.eventLineColors[i % @options.eventLineColors.length]

      @drawEvent(event, color)

  drawGoal: (goal, color) ->

    @raphael.path("M#{@left},#{@transY(goal)}H#{@right}")

      .attr('stroke', color)

      .attr('stroke-width', @options.goalStrokeWidth)

  drawEvent: (event, color) ->

    @raphael.path("M#{@transX(event)},#{@bottom}V#{@top}")

      .attr('stroke', color)

      .attr('stroke-width', @options.eventStrokeWidth)

  drawYAxisLabel: (xPos, yPos, text) ->

    @raphael.text(xPos, yPos, text)

      .attr('font-size', @options.gridTextSize)

      .attr('font-family', @options.gridTextFamily)

      .attr('font-weight', @options.gridTextWeight)

      .attr('fill', @options.gridTextColor)

      .attr('text-anchor', 'end')

  drawGridLine: (path) ->

    @raphael.path(path)

      .attr('stroke', @options.gridLineColor)

      .attr('stroke-width', @options.gridStrokeWidth)

  # Range selection

  #

  startRange: (x) ->

    @hover.hide()

    @selectFrom = x

    @selectionRect.attr({ x: x, width: 0 }).show()

  endRange: (x) ->

    if @selectFrom

      start = Math.min(@selectFrom, x)

      end = Math.max(@selectFrom, x)

      @options.rangeSelect.call @el,

        start: @data[@hitTest(start)].x

        end: @data[@hitTest(end)].x

      @selectFrom = null

  resizeHandler: =>

    @timeoutId = null

    @raphael.setSize @el.width(), @el.height()

    @redraw()

# Parse a date into a javascript timestamp

#

#

Morris.parseDate = (date) ->

  if typeof date is 'number'

    return date

  m = date.match /^(\d+) Q(\d)$/

  n = date.match /^(\d+)-(\d+)$/

  o = date.match /^(\d+)-(\d+)-(\d+)$/

  p = date.match /^(\d+) W(\d+)$/

  q = date.match /^(\d+)-(\d+)-(\d+)[ T](\d+):(\d+)(Z|([+-])(\d\d):?(\d\d))?$/

  r = date.match /^(\d+)-(\d+)-(\d+)[ T](\d+):(\d+):(\d+(\.\d+)?)(Z|([+-])(\d\d):?(\d\d))?$/

  if m

    new Date(

      parseInt(m[1], 10),

      parseInt(m[2], 10) * 3 - 1,

      1).getTime()

  else if n

    new Date(

      parseInt(n[1], 10),

      parseInt(n[2], 10) - 1,

      1).getTime()

  else if o

    new Date(

      parseInt(o[1], 10),

      parseInt(o[2], 10) - 1,

      parseInt(o[3], 10)).getTime()

  else if p

    # calculate number of weeks in year given

    ret = new Date(parseInt(p[1], 10), 0, 1);

    # first thursday in year (ISO 8601 standard)

    if ret.getDay() isnt 4

      ret.setMonth(0, 1 + ((4 - ret.getDay()) + 7) % 7);

    # add weeks

    ret.getTime() + parseInt(p[2], 10) * 604800000

  else if q

    if not q[6]

      # no timezone info, use local

      new Date(

        parseInt(q[1], 10),

        parseInt(q[2], 10) - 1,

        parseInt(q[3], 10),

        parseInt(q[4], 10),

        parseInt(q[5], 10)).getTime()

    else

      # timezone info supplied, use UTC

      offsetmins = 0

      if q[6] != 'Z'

        offsetmins = parseInt(q[8], 10) * 60 + parseInt(q[9], 10)

        offsetmins = 0 - offsetmins if q[7] == '+'

      Date.UTC(

        parseInt(q[1], 10),

        parseInt(q[2], 10) - 1,

        parseInt(q[3], 10),

        parseInt(q[4], 10),

        parseInt(q[5], 10) + offsetmins)

  else if r

    secs = parseFloat(r[6])

    isecs = Math.floor(secs)

    msecs = Math.round((secs - isecs) * 1000)

    if not r[8]

      # no timezone info, use local

      new Date(

        parseInt(r[1], 10),

        parseInt(r[2], 10) - 1,

        parseInt(r[3], 10),

        parseInt(r[4], 10),

        parseInt(r[5], 10),

        isecs,

        msecs).getTime()

    else

      # timezone info supplied, use UTC

      offsetmins = 0

      if r[8] != 'Z'

        offsetmins = parseInt(r[10], 10) * 60 + parseInt(r[11], 10)

        offsetmins = 0 - offsetmins if r[9] == '+'

      Date.UTC(

        parseInt(r[1], 10),

        parseInt(r[2], 10) - 1,

        parseInt(r[3], 10),

        parseInt(r[4], 10),

        parseInt(r[5], 10) + offsetmins,

        isecs,

        msecs)

  else

    new Date(parseInt(date, 10), 0, 1).getTime()