_         =   require 'lodash'
fs        =   require 'fs'
uid       =   require 'uid'
colors    =   require 'colors/safe'
glob      =   require 'glob'
mkdirs    =   require './mkdirs'
convert   =   require 'xml-js'
Promise   =   require 'bluebird'
read      =   Promise.promisify fs.readFile
write     =   Promise.promisify fs.writeFile

SEED          =   10
duplicate     =   false # reserved
names         =   {}
expect        =   (v) -> /^-?\d+((\.?\d+(dp|sp))|(dp|sp))$/.test v
DECLARATION   =   '<?xml version="1.0" encoding="utf-8"?>'

dispatcher = (file, elements) ->
  read file, 'utf-8'
    .then (xmlstr) ->
      document = convert.xml2js xmlstr
      parser document, elements
      xmloutstr = convert.js2xml document,
          indentAttributes: true
          ignoreDeclaration: true
          spaces: 4
      write file, "#{DECLARATION}#{xmloutstr}"
    .then ->
      console.log "#{colors.yellow '+'} [#{file}] #{colors.green 'extracted.'}"

parser = (document, elements) ->
  for key, value of document
    if _.isArray value
      for v in value
        parser v, elements
    else if _.isObject value
      parser value, elements
    else
      if expect value
        name = "ithot#{uid(SEED)}"
        elements.push
          type: 'element'
          name: 'dimen'
          attributes:
            name: name
          elements: [
            type: 'text'
            text: value
          ]
        document[key] = "@dimen/#{name}"

handler = ({extract, output}) ->
  files = unless fs.lstatSync(extract).isDirectory() then [extract] else glob.sync("#{extract}/**/!(dimens).xml")
  dimens =
    declaration:
      attributes:
        version: '1.0'
        encoding: 'utf-8'
    elements: [
      type: 'element'
      name: 'resources'
      elements: []
    ]
  promises = for file in files
    dispatcher file, dimens.elements[0].elements
  Promise
    .all promises
    .then ->
      mkdirs output
    .then ->
      write "#{output}/dimens.xml", convert.js2xml(dimens, spaces: 4)
    .then ->
      console.log "> #{colors.cyan('all done.')}"

module.exports = (option) ->
  handler option