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'use strict'

module.exports = ansiHTML

// Reference to https://github.com/sindresorhus/ansi-regex
var _regANSI = /(?:(?:\u001b\[)|\u009b)(?:(?:[0-9]{1,3})?(?:(?:;[0-9]{0,3})*)?[A-M|f-m])|\u001b[A-M]/

var _defColors = {
  reset: ['fff', '000'], // [FOREGROUD_COLOR, BACKGROUND_COLOR]
  black: '000',
  red: 'ff0000',
  green: '209805',
  yellow: 'e8bf03',
  blue: '0000ff',
  magenta: 'ff00ff',
  cyan: '00ffee',
  lightgrey: 'f0f0f0',
  darkgrey: '888'
}
var _styles = {
  30: 'black',
  31: 'red',
  32: 'green',
  33: 'yellow',
  34: 'blue',
  35: 'magenta',
  36: 'cyan',
  37: 'lightgrey'
}
var _openTags = {
  '1': 'font-weight:bold', // bold
  '2': 'opacity:0.5', // dim
  '3': '<i>', // italic
  '4': '<u>', // underscore
  '8': 'display:none', // hidden
  '9': '<del>' // delete
}
var _closeTags = {
  '23': '</i>', // reset italic
  '24': '</u>', // reset underscore
  '29': '</del>' // reset delete
}

;[0, 21, 22, 27, 28, 39, 49].forEach(function (n) {
  _closeTags[n] = '</span>'
})

/**
 * Converts text with ANSI color codes to HTML markup.
 * @param {String} text
 * @returns {*}
 */
function ansiHTML (text) {
  // Returns the text if the string has no ANSI escape code.
  if (!_regANSI.test(text)) {
    return text
  }

  // Cache opened sequence.
  var ansiCodes = []
  // Replace with markup.
  var ret = text.replace(/\033\[(\d+)m/g, function (match, seq) {
    var ot = _openTags[seq]
    if (ot) {
      // If current sequence has been opened, close it.
      if (!!~ansiCodes.indexOf(seq)) { // eslint-disable-line no-extra-boolean-cast
        ansiCodes.pop()
        return '</span>'
      }
      // Open tag.
      ansiCodes.push(seq)
      return ot[0] === '<' ? ot : '<span style="' + ot + ';">'
    }

    var ct = _closeTags[seq]
    if (ct) {
      // Pop sequence
      ansiCodes.pop()
      return ct
    }
    return ''
  })

  // Make sure tags are closed.
  var l = ansiCodes.length
  ;(l > 0) && (ret += Array(l + 1).join('</span>'))

  return ret
}

/**
 * Customize colors.
 * @param {Object} colors reference to _defColors
 */
ansiHTML.setColors = function (colors) {
  if (typeof colors !== 'object') {
    throw new Error('`colors` parameter must be an Object.')
  }

  var _finalColors = {}
  for (var key in _defColors) {
    var hex = colors.hasOwnProperty(key) ? colors[key] : null
    if (!hex) {
      _finalColors[key] = _defColors[key]
      continue
    }
    if ('reset' === key) {
      if (typeof hex === 'string') {
        hex = [hex]
      }
      if (!Array.isArray(hex) || hex.length === 0 || hex.some(function (h) {
        return typeof h !== 'string'
      })) {
        throw new Error('The value of `' + key + '` property must be an Array and each item could only be a hex string, e.g.: FF0000')
      }
      var defHexColor = _defColors[key]
      if (!hex[0]) {
        hex[0] = defHexColor[0]
      }
      if (hex.length === 1 || !hex[1]) {
        hex = [hex[0]]
        hex.push(defHexColor[1])
      }

      hex = hex.slice(0, 2)
    } else if (typeof hex !== 'string') {
      throw new Error('The value of `' + key + '` property must be a hex string, e.g.: FF0000')
    }
    _finalColors[key] = hex
  }
  _setTags(_finalColors)
}

/**
 * Reset colors.
 */
ansiHTML.reset = function () {
  _setTags(_defColors)
}

/**
 * Expose tags, including open and close.
 * @type {Object}
 */
ansiHTML.tags = {}

if (Object.defineProperty) {
  Object.defineProperty(ansiHTML.tags, 'open', {
    get: function () { return _openTags }
  })
  Object.defineProperty(ansiHTML.tags, 'close', {
    get: function () { return _closeTags }
  })
} else {
  ansiHTML.tags.open = _openTags
  ansiHTML.tags.close = _closeTags
}

function _setTags (colors) {
  // reset all
  _openTags['0'] = 'font-weight:normal;opacity:1;color:#' + colors.reset[0] + ';background:#' + colors.reset[1]
  // inverse
  _openTags['7'] = 'color:#' + colors.reset[1] + ';background:#' + colors.reset[0]
  // dark grey
  _openTags['90'] = 'color:#' + colors.darkgrey

  for (var code in _styles) {
    var color = _styles[code]
    var oriColor = colors[color] || '000'
    _openTags[code] = 'color:#' + oriColor
    code = parseInt(code)
    _openTags[(code + 10).toString()] = 'background:#' + oriColor
  }
}

ansiHTML.reset()