import CLASS from './class'
import { ChartInternal } from './core'
import { getBBox } from './util'

ChartInternal.prototype.initText = function() {
  var $$ = this
  $$.main
    .select('.' + CLASS.chart)
    .append('g')
    .attr('class', CLASS.chartTexts)
  $$.mainText = $$.d3.selectAll([])
}
ChartInternal.prototype.updateTargetsForText = function(targets) {
  var $$ = this,
    classChartText = $$.classChartText.bind($$),
    classTexts = $$.classTexts.bind($$),
    classFocus = $$.classFocus.bind($$)
  var mainText = $$.main
    .select('.' + CLASS.chartTexts)
    .selectAll('.' + CLASS.chartText)
    .data(targets)
  var mainTextEnter = mainText
    .enter()
    .append('g')
    .attr('class', classChartText)
    .style('opacity', 0)
    .style('pointer-events', 'none')
  mainTextEnter.append('g').attr('class', classTexts)
  mainTextEnter.merge(mainText).attr('class', function(d) {
    return classChartText(d) + classFocus(d)
  })
}
ChartInternal.prototype.updateText = function(
  xForText,
  yForText,
  durationForExit
) {
  var $$ = this,
    config = $$.config,
    barOrLineData = $$.barOrLineData.bind($$),
    classText = $$.classText.bind($$)
  var mainText = $$.main
    .selectAll('.' + CLASS.texts)
    .selectAll('.' + CLASS.text)
    .data(barOrLineData)
  var mainTextEnter = mainText
    .enter()
    .append('text')
    .attr('class', classText)
    .attr('text-anchor', function(d) {
      return config.axis_rotated ? (d.value < 0 ? 'end' : 'start') : 'middle'
    })
    .style('stroke', 'none')
    .attr('x', xForText)
    .attr('y', yForText)
    .style('fill', function(d) {
      return $$.color(d)
    })
    .style('fill-opacity', 0)
  $$.mainText = mainTextEnter.merge(mainText).text(function(d, i, j) {
    return $$.dataLabelFormat(d.id)(d.value, d.id, i, j)
  })
  mainText
    .exit()
    .transition()
    .duration(durationForExit)
    .style('fill-opacity', 0)
    .remove()
}
ChartInternal.prototype.redrawText = function(
  xForText,
  yForText,
  forFlow,
  withTransition,
  transition
) {
  return [
    (withTransition ? this.mainText.transition(transition) : this.mainText)
      .attr('x', xForText)
      .attr('y', yForText)
      .style('fill', this.color)
      .style('fill-opacity', forFlow ? 0 : this.opacityForText.bind(this))
  ]
}
ChartInternal.prototype.getTextRect = function(text, cls, element) {
  var dummy = this.d3
      .select('body')
      .append('div')
      .classed('c3', true),
    svg = dummy
      .append('svg')
      .style('visibility', 'hidden')
      .style('position', 'fixed')
      .style('top', 0)
      .style('left', 0),
    font = this.d3.select(element).style('font'),
    rect
  svg
    .selectAll('.dummy')
    .data([text])
    .enter()
    .append('text')
    .classed(cls ? cls : '', true)
    .style('font', font)
    .text(text)
    .each(function() {
      rect = getBBox(this)
    })
  dummy.remove()
  return rect
}
ChartInternal.prototype.generateXYForText = function(
  areaIndices,
  barIndices,
  lineIndices,
  forX
) {
  var $$ = this,
    getAreaPoints = $$.generateGetAreaPoints(areaIndices, false),
    getBarPoints = $$.generateGetBarPoints(barIndices, false),
    getLinePoints = $$.generateGetLinePoints(lineIndices, false),
    getter = forX ? $$.getXForText : $$.getYForText
  return function(d, i) {
    var getPoints = $$.isAreaType(d)
      ? getAreaPoints
      : $$.isBarType(d)
      ? getBarPoints
      : getLinePoints
    return getter.call($$, getPoints(d, i), d, this)
  }
}
ChartInternal.prototype.getXForText = function(points, d, textElement) {
  var $$ = this,
    box = getBBox(textElement),
    xPos,
    padding
  if ($$.config.axis_rotated) {
    padding = $$.isBarType(d) ? 4 : 6
    xPos = points[2][1] + padding * (d.value < 0 ? -1 : 1)
  } else {
    xPos = $$.hasType('bar') ? (points[2][0] + points[0][0]) / 2 : points[0][0]
  }
  // show labels regardless of the domain if value is null
  if (d.value === null) {
    if (xPos > $$.width) {
      xPos = $$.width - box.width
    } else if (xPos < 0) {
      xPos = 4
    }
  }
  return xPos
}
ChartInternal.prototype.getYForText = function(points, d, textElement) {
  var $$ = this,
    box = getBBox(textElement),
    yPos
  if ($$.config.axis_rotated) {
    yPos = (points[0][0] + points[2][0] + box.height * 0.6) / 2
  } else {
    yPos = points[2][1]
    if (d.value < 0 || (d.value === 0 && !$$.hasPositiveValue)) {
      yPos += box.height
      if ($$.isBarType(d) && $$.isSafari()) {
        yPos -= 3
      } else if (!$$.isBarType(d) && $$.isChrome()) {
        yPos += 3
      }
    } else {
      yPos += $$.isBarType(d) ? -3 : -6
    }
  }
  // show labels regardless of the domain if value is null
  if (d.value === null && !$$.config.axis_rotated) {
    if (yPos < box.height) {
      yPos = box.height
    } else if (yPos > this.height) {
      yPos = this.height - 4
    }
  }
  return yPos
}