class Pettanr.Cache
  
  constructor: (options) ->
    @data = {}
    _.extend(this, Backbone.Events)
  
  # return cached items
  store: (items) ->
    if _.isArray(items)
      return_items = _.map items, (item) =>
        r = @restore(item.cache_key())
        r = @store(item) if !r
        r
    else
      item = items
      cached_item = @restore(item.cache_key())
      return_items = if cached_item
        cached_item  # merge?
      else
        @data[item.cache_key()] = item
      @refresh(return_items)
    return_items
  
  restore: (key) ->
    k = if _.isString(key)
      key
    else
      key.cache_key()
    item = @data[k]
    if item
      @refresh(item)
  
  refresh: (item) ->
    if item.expire_time
      if Date.now() >= return_items.expire_time
        @sync(item)
    item
  
  sync: (item) ->
    item.fetch().done =>
      item.expire_time.setTime(Date.now() + 10 * 60 * 1000)