# # createUUID

OJ = require '../oj'
  
###
Generates a random string that complies to the RFC 4122 specification for GUID/UUID.
(e.g. 'B42A153F-1D9A-4F92-9903-92C11DD684D2')
While not a true UUID, for the purposes of this application, it should be sufficient.
###
createFauxUUID = ->
    
  # http://www.ietf.org/rfc/rfc4122.txt
  # http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript
  s = []
  s.length = 36
  hexDigits = '0123456789abcdef'
  i = 0

  while i < 36
    s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1)
    i += 1
  s[14] = '4' # bits 12-15 of the time_hi_and_version field to 0010
  s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1) # bits 6-7 of the clock_seq_hi_and_reserved to 01
  s[8] = s[13] = s[18] = s[23] = '-'
  uuid = s.join('')
  uuid

OJ.register 'createUUID', createFauxUUID
module.exports = createFauxUUID