var c3ext = {}
c3ext.generate = function(options) {
  if (options.zoom2 != null) {
    zoom2_reducers = options.zoom2.reducers || {}
    zoom2_enabled = options.zoom2.enabled
    _zoom2_factor = options.zoom2.factor || 1
    _zoom2_maxItems = options.zoom2.maxItems
  }

  if (!zoom2_enabled) {
    return c3.generate(options)
  }

  var originalData = Q.copy(options.data)
  var zoom2_reducers
  var zoom2_enabled
  var _zoom2_maxItems

  if (_zoom2_maxItems == null) {
    var el = d3.select(options.bindto).node()
    if (el != null) {
      var availWidth = el.clientWidth

      var pointSize = 20
      _zoom2_maxItems = Math.ceil(availWidth / pointSize)
    }
    if (_zoom2_maxItems == null || _zoom2_maxItems < 10) {
      _zoom2_maxItems = 10
    }
  }

  function onZoomChanged(e) {
    refresh()
  }

  var zoom2 = c3ext.ZoomBehavior({
    changed: onZoomChanged,
    bindto: options.bindto
  })

  zoom2.enhance = function() {
    _zoom2_maxItems *= 2
    var totalItems = zoom2.getZoom().totalItems
    if (_zoom2_maxItems > totalItems) _zoom2_maxItems = totalItems
    refresh()
  }
  zoom2.dehance = function() {
    _zoom2_maxItems = Math.ceil(_zoom2_maxItems / 2) + 1
    refresh()
  }

  zoom2.maxItems = function() {
    return _zoom2_maxItems
  }
  function zoomAndReduceData(list, zoomRange, func, maxItems) {
    //var maxItems = 10;//Math.ceil(10 * zoomFactor);
    var list2 = list.slice(zoomRange[0], zoomRange[1])
    var chunkSize = 1
    var list3 = list2
    if (list3.length > maxItems) {
      var chunkSize = Math.ceil(list2.length / maxItems)
      list3 = list3.splitIntoChunksOf(chunkSize).map(func)
    }
    //console.log("x" + getCurrentZoomLevel() + ", maxItems=" + maxItems + " chunkSize=" + chunkSize + " totalBefore=" + list2.length + ", totalAfter=" + list3.length);
    return list3
  }

  function first(t) {
    return t[0]
  }

  var getDataForZoom = function(data) {
    if (data.columns == null || data.columns.length == 0) return

    var zoomInfo = zoom2.getZoom()
    if (zoomInfo.totalItems != data.columns[0].length - 1) {
      zoom2.setOptions({ totalItems: data.columns[0].length - 1 })
      zoomInfo = zoom2.getZoom()
    }
    data.columns = originalData.columns.map(function(column) {
      var name = column[0]
      var reducer = zoom2_reducers[name] || first //by default take the first

      var values = column.slice(1)
      var newValues = zoomAndReduceData(
        values,
        zoomInfo.currentZoom,
        reducer,
        _zoom2_maxItems
      )
      return [name].concat(newValues)
    })
    return data
  }

  getDataForZoom(options.data)
  var chart = c3.generate(options)
  var _chart_load_org = chart.load.bind(chart)
  chart.zoom2 = zoom2
  chart.load = function(data) {
    if (data.unload) {
      unload(data.unload)
      delete data.unload
    }
    Q.copy(data, originalData)
    refresh()
  }
  chart.unload = function(names) {
    unload(names)
    refresh()
  }

  function unload(names) {
    originalData.columns.removeAll(function(t) {
      names.contains(t)
    })
  }

  function refresh() {
    var data = Q.copy(originalData)
    getDataForZoom(data)
    _chart_load_org(data)
  }

  return chart
}

c3ext.ZoomBehavior = function(options) {
  var zoom = { __type: 'ZoomBehavior' }

  var _zoom2_factor
  var _left
  var totalItems
  var currentZoom
  var bindto = options.bindto
  var _zoomChanged = options.changed || function() {}
  var element
  var mousewheelTimer
  var deltaY = 0
  var leftRatio = 0

  zoom.setOptions = function(options) {
    if (options == null) options = {}
    _zoom2_factor = options.factor || 1
    _left = 0
    totalItems = options.totalItems || 0
    currentZoom = [0, totalItems]
    _zoomChanged = options.changed || _zoomChanged
  }

  zoom.setOptions(options)

  function verifyZoom(newZoom) {
    //newZoom.sort();
    if (newZoom[1] > totalItems) {
      var diff = newZoom[1] - totalItems
      newZoom[0] -= diff
      newZoom[1] -= diff
    }
    if (newZoom[0] < 0) {
      var diff = newZoom[0] * -1
      newZoom[0] += diff
      newZoom[1] += diff
    }
    if (newZoom[1] > totalItems) newZoom[1] = totalItems
    if (newZoom[0] < 0) newZoom[0] = 0
  }

  function zoomAndPan(zoomFactor, left) {
    var itemsToShow = Math.ceil(totalItems / zoomFactor)
    var newZoom = [left, left + itemsToShow]
    verifyZoom(newZoom)
    currentZoom = newZoom
    onZoomChanged()
  }

  function onZoomChanged() {
    if (_zoomChanged != null) _zoomChanged(zoom.getZoom())
  }
  function applyZoomAndPan() {
    zoomAndPan(_zoom2_factor, _left)
  }
  function getItemsToShow() {
    var itemsToShow = Math.ceil(totalItems / _zoom2_factor)
    return itemsToShow
  }

  zoom.getZoom = function() {
    return { totalItems: totalItems, currentZoom: currentZoom.slice() }
  }

  zoom.factor = function(factor, skipDraw) {
    if (arguments.length == 0) return _zoom2_factor
    _zoom2_factor = factor
    if (_zoom2_factor < 1) _zoom2_factor = 1
    if (skipDraw) return
    applyZoomAndPan()
  }
  zoom.left = function(left, skipDraw) {
    if (arguments.length == 0) return _left
    _left = left
    if (_left < 0) _left = 0
    var pageSize = getItemsToShow()
    //_left += pageSize;
    if (_left + pageSize > totalItems) _left = totalItems - pageSize
    console.log({ left: _left, pageSize: pageSize })
    if (skipDraw) return
    applyZoomAndPan()
  }

  zoom.zoomAndPanByRatio = function(zoomRatio, panRatio) {
    var pageSize = getItemsToShow()
    var leftOffset = Math.round(pageSize * panRatio)
    var mouseLeft = _left + leftOffset
    zoom.factor(zoom.factor() * zoomRatio, true)

    var finalLeft = mouseLeft
    if (zoomRatio != 1) {
      var pageSize2 = getItemsToShow()
      var leftOffset2 = Math.round(pageSize2 * panRatio)
      finalLeft = mouseLeft - leftOffset2
    }
    zoom.left(finalLeft, true)
    applyZoomAndPan()
  }

  zoom.zoomIn = function() {
    zoom.zoomAndPanByRatio(2, 0)
  }

  zoom.zoomOut = function() {
    zoom.zoomAndPanByRatio(0.5, 0)
  }

  zoom.panLeft = function() {
    zoom.zoomAndPanByRatio(1, -1)
  }
  zoom.panRight = function() {
    zoom.zoomAndPanByRatio(1, 1)
  }

  zoom.reset = function() {
    _left = 0
    _zoom2_factor = 1
    applyZoomAndPan()
  }

  function doZoom() {
    if (deltaY != 0) {
      var maxDelta = 10
      var multiply = (maxDelta + deltaY) / maxDelta
      //var factor = chart.zoom2.factor()*multiply;
      //factor= Math.ceil(factor*100) / 100;
      console.log({ deltaY: deltaY, multiply: multiply })
      zoom.zoomAndPanByRatio(multiply, leftRatio) //0.5);//leftRatio);
      deltaY = 0
    }
  }

  function element_mousewheel(e) {
    deltaY += e.deltaY
    leftRatio = (e.offsetX - 70) / (e.currentTarget.offsetWidth - 70)
    //console.log({ "e.offsetX": e.offsetX, "e.currentTarget.offsetWidth": e.currentTarget.offsetWidth, leftRatio: leftRatio });
    mousewheelTimer.set(150)
    e.preventDefault()
  }

  if (bindto != null) {
    element = $(options.bindto)
    if (element.mousewheel) {
      mousewheelTimer = new Timer(doZoom)
      element.mousewheel(element_mousewheel)
    }
  }

  return zoom
}

if (typeof Q == 'undefined') {
  var Q = function() {}

  Q.copy = function(src, target, options, depth) {
    ///<summary>Copies an object into a target object, recursively cloning any object or array in the way, overwrite=true will overwrite a primitive field value even if exists</summary>
    ///<param name="src" />
    ///<param name="target" />
    ///<param name="options" type="Object">{ overwrite:false }</param>
    ///<returns type="Object">The copied object</returns>
    if (depth == null) depth = 0
    if (depth == 100) {
      console.warn('Q.copy is in depth of 100 - possible circular reference')
    }
    options = options || { overwrite: false }
    if (src == target || src == null) return target
    if (typeof src != 'object') {
      if (options.overwrite || target == null) return src
      return target
    }
    if (typeof src.clone == 'function') {
      if (options.overwrite || target == null) return src.clone()
      return target
    }
    if (target == null) {
      if (src instanceof Array) target = []
      else target = {}
    }

    if (src instanceof Array) {
      for (var i = 0; i < src.length; i++) {
        var item = src[i]
        var item2 = target[i]
        item2 = Q.copy(item, item2, options, depth + 1)
        target[i] = item2
      }
      target.splice(src.length, target.length - src.length)
      return target
    }
    for (var p in src) {
      var value = src[p]
      var value2 = target[p]
      value2 = Q.copy(value, value2, options, depth + 1)
      target[p] = value2
    }
    return target
  }
}
if (typeof Timer == 'undefined') {
  var Timer = function(action, ms) {
    this.action = action
    if (ms != null) this.set(ms)
  }

  Timer.prototype.set = function(ms) {
    if (ms == null) ms = this._ms
    else this._ms = ms
    this.clear()
    if (ms == null) return
    this.timeout = window.setTimeout(this.onTick.bind(this), ms)
  }

  Timer.prototype.onTick = function() {
    this.clear()
    this.action()
  }

  Timer.prototype.clear = function(ms) {
    if (this.timeout == null) return
    window.clearTimeout(this.timeout)
    this.timeout = null
  }
}
if (typeof Array.prototype.splitIntoChunksOf == 'undefined') {
  Array.prototype.splitIntoChunksOf = function(countInEachChunk) {
    var chunks = Math.ceil(this.length / countInEachChunk)
    var list = []
    for (var i = 0; i < this.length; i += countInEachChunk) {
      list.push(this.slice(i, i + countInEachChunk))
    }
    return list
  }
}
