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 Swappable Mixins in CoffeeScript
# ================================
# Many thanks to Hashmal, who wrote this to start.
# https://gist.github.com/803816/aceed8fc57188c3a19ce2eccdb25acb64f2be94e
class Mixin
  augment: (t) ->
    (t[n] = m unless n == 'augment' or !this[n].prototype?) for n, m of this
    t.setup()
  eject: (mixin) ->
    (delete this[n] if m in (p for o, p of mixin::)) for n, m of this

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class ObjectHelper
  @addRole: (base, role) =>
    if not role::augment?
      throw "RoleMustHave.augment()"
    role::augment(base)
    _.bindAll(base)

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class Nothing
  constructor: (@name="nothing") ->

class Presenter extends Mixin
  presentYourself: =>
    "My name is #{@name}"

something = new Nothing()
ObjectHelper.addRole(something, Presenter)

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class Nothing
  constructor: (@name="nothing") ->

  doSomething: =>
    "I cannot do anything"

class Presenter extends Mixin
  presentYourself: =>
    "My name is #{@name}"

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aaa

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class InviteFriendsUsecase


  execute: 
    bind('click', player.inviteFriends())



class model.Player
  inviteFriends: =>

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class Ebay
  constructor: ->

    #I'm yet to decide if static vs dynamic roles' assignment 
    #is better. It doesn't matter so much for now

    #extend(@, EbayCanBeWatchedRole)
    #extend(@, SellersCanListRole)

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#async/callbacks ignored for clarity of example

class WatchItemUsecase
  constructor: (@ebay, @seller) ->
      
  execute: (item) =>
    
    try 
      @ebay.seller_wants_to_watch_item(@seller, item)

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#async/callbacks ignored for clarity of example

class ListItemUsecase
  constructor: (@ebay, @seller) ->
      
  execute: (listing_definition) =>
    
    answer = @ebay.list_items(@seller, @ebay)
    if answer.listing_is_valid()
      alert('ok - item was scheduled for listing')

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describe "Any Game", ->
  describe "GameResults", ->
    describe "When any application starts", ->

      afterEach ->
        $("#gameScreen").remove()

      it "shooter should show game results when game ends", ->
        [engine, services] = runEngineApp('shooter', test.shooter.ServerResponses)