brain-wrapper.coffee

_ = require "lodash"

class BrainWrapper
  constructor: (@brain, @key, @initialData, @migrator = _.identity) ->

  get: (path = null, defaultValue = null) ->
    data = @_get()
    if path then _.get(data, path, defaultValue) else data

  set: (path, value) ->
    data = @_get()
    _.set(data, path, value)
    @update data

  update: (data) ->
    @brain.set @key, data

  _get: () ->
    data = @brain.get(@key) || @initialData
    unless data.version >= @initialData.version
      data = @migrator(data)
      data.version = @initialData.version
      @update(data)
    data

module.exports = BrainWrapper