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var parseAttributes = require('./parse-attribs')
var parseFromString = require('xml-parse-from-string')

//In some cases element.attribute.nodeName can return
//all lowercase values.. so we need to map them to the correct 
//case
var NAME_MAP = {
  scaleh: 'scaleH',
  scalew: 'scaleW',
  stretchh: 'stretchH',
  lineheight: 'lineHeight',
  alphachnl: 'alphaChnl',
  redchnl: 'redChnl',
  greenchnl: 'greenChnl',
  bluechnl: 'blueChnl'
}

module.exports = function parse(data) {
  data = data.toString()
  
  var xmlRoot = parseFromString(data)
  var output = {
    pages: [],
    chars: [],
    kernings: []
  }

  //get config settings
  ;['info', 'common'].forEach(function(key) {
    var element = xmlRoot.getElementsByTagName(key)[0]
    if (element)
      output[key] = parseAttributes(getAttribs(element))
  })

  //get page info
  var pageRoot = xmlRoot.getElementsByTagName('pages')[0]
  if (!pageRoot)
    throw new Error('malformed file -- no <pages> element')
  var pages = pageRoot.getElementsByTagName('page')
  for (var i=0; i<pages.length; i++) {
    var p = pages[i]
    var id = parseInt(p.getAttribute('id'), 10)
    var file = p.getAttribute('file')
    if (isNaN(id))
      throw new Error('malformed file -- page "id" attribute is NaN')
    if (!file)
      throw new Error('malformed file -- needs page "file" attribute')
    output.pages[parseInt(id, 10)] = file
  }

  //get kernings / chars
  ;['chars', 'kernings'].forEach(function(key) {
    var element = xmlRoot.getElementsByTagName(key)[0]
    if (!element)
      return
    var childTag = key.substring(0, key.length-1)
    var children = element.getElementsByTagName(childTag)
    for (var i=0; i<children.length; i++) {      
      var child = children[i]
      output[key].push(parseAttributes(getAttribs(child)))
    }
  })
  return output
}

function getAttribs(element) {
  var attribs = getAttribList(element)
  return attribs.reduce(function(dict, attrib) {
    var key = mapName(attrib.nodeName)
    dict[key] = attrib.nodeValue
    return dict
  }, {})
}

function getAttribList(element) {
  //IE8+ and modern browsers
  var attribs = []
  for (var i=0; i<element.attributes.length; i++)
    attribs.push(element.attributes[i])
  return attribs
}

function mapName(nodeName) {
  return NAME_MAP[nodeName.toLowerCase()] || nodeName
}