PropertyModel.coffee

angular.module('app')
.factory "PropertyModel", ($log) ->

  class PropertyModel
    @defaults: ->
      angular.copy( {} )

    constructor: (properties)->
      @update(properties)

    accessors: {}


    # Pass in string of property name
    # returns property value
    get: (propName) ->
      @_getOrCallProperty propName


    # Pass in string of property name and value, or if complex property; values
    set: (propName, values...) ->
      setterMethod = @accessors["set_#{propName}"]
      if setterMethod?
        setterMethod.apply @, values
      else
        if values.length > 1 then throw "Cannot provide multiple values for a singular property"
        @properties[propName] = values[0]


    # Pass in an object of key/value pairs to use as properties.
    # This will reset the properties of this object to those passed in
    # plus any default properties defined on the constructing class.
    update: (properties={}) ->
      unless angular.isObject properties then throw "'#{@.constructor?.name}' properties must be contructed with an object '{}'"

      @properties = @properties || {}
      unless _.isEqual(angular.copy(@properties), properties)
        defaults = this.constructor.defaults?() || {}
        @properties = _.extend(defaults, properties)


    _getOrCallProperty: (propName) ->
      readerMethod = @accessors?["get_#{propName}"]
      if readerMethod?
        readerMethod.apply @
      else if @properties.hasOwnProperty(propName)
        @properties[propName]
      else
        $log.error "PropertyNotFound: '#{propName}' on #{@.constructor?.name} Model"
        return null