import Ember from 'ember'
import buildMessage from 'ember-changeset-validations/utils/validation-errors'

_isPresent = (value) ->
  if (value instanceof Ember.ObjectProxy || value instanceof Ember.ArrayProxy)
    return Ember._isPresent(Ember.get(value, 'content'))
  Ember.isPresent(value)

_testPresence = (key, value, presence, context = {}) ->
  if presence
    return Ember._isPresent(value) || buildMessage(key, 'present', value, context)
  else
    return Ember.isBlank(value) || buildMessage(key, 'blank', value, context)

export default (opts)->
  (key, value, oldValue, changes, content) =>
    if typeof opts is "function"
      presence = true
      condition = opts
    else
      presence = if "presence" in opts then opts.presence else true
      condition = opts.condition

    # since contentn is the model we have to emulate the changes for now
    condition_object = Ember.assign(content.toJSON(), changes)
    if condition.call(condition_object) # perform validation when condition returns true
      if presence
        _isPresent(value) || buildMessage(key, 'present', value, opts)
      else
        isBlank(value) || buildMessage(key, 'blank', value, opts)
    else
      true
    #return _testPresence(key, value, opts)