var exec    = require('./exec')
  , running = false
  , queue   = []
  , debug   = require('debug')('win-detect-browsers')

// Retrieve version number with WMIC. Runs 
// sequential, because WMIC can't handle 
// concurrent calls on WinXP.
module.exports = function(path, cb) {
  queue.push([path, cb])
  run()
}

function run() {
  if (running) return
  running = true

  var item = queue.shift()

  if (item == null) {
    running = false
    return
  }

  var path = item[0], cb = item[1]

  // Escape much?
  var escaped = path.replace(/\\|\//g, '\\\\')

  var args = [
    'datafile where Name="' + escaped + '"', 
    'get Version /format:value'
  ]
  
  debug("get version with 'wmic %s'", args.join(' '))

  exec('wmic', args, function(err, out){
    if (err) cb(err)
    else {
      // "Version=xx"
      var version = out.split('=')[1]
      if (!version) cb(new Error('Could not parse version: "'+out+'"'))
      else cb(null, version)
    }

    running = false
    setImmediate(run)
  })
}