# encoding: UTF-8

# Copyright 2011 innoQ Deutschland GmbH
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

class Labeling::Base < ActiveRecord::Base

  self.table_name = 'labelings'

  class_attribute :rdf_namespace, :rdf_predicate
  self.rdf_namespace = nil
  self.rdf_predicate = nil

  # ********** Associations

  belongs_to :owner,  :class_name => "Concept::Base"
  belongs_to :target, :class_name => "Label::Base"

  # ********** Scopes

  scope :by_concept, lambda { |concept|
    where(:owner_id => concept.id)
  }

  scope :by_label, lambda { |label|
    where(:target_id => label.id)
  }

  scope :concept_published, lambda {
    includes(:owner).merge(Concept::Base.published)
  }

  scope :label_published, lambda {
    includes(:target).merge(Label::Base.published)
  }

  scope :label_begins_with, lambda { |letter|
    includes(:target).merge(Label::Base.begins_with(letter))
  }

  scope :by_label_language, lambda { |lang|
    includes(:target).merge(Label::Base.by_language(lang.to_s))
  }

  # ********** Methods

  # if `singular` is true, only a single occurrence is allowed per instance
  # FIXME: There must be a validation checking this
  # Might there be more than one labeling of this type and language per concept?
  def self.singular?
    false
  end

  def self.view_section(obj)
    obj.is_a?(Label::Base) ? "concepts" : "labels"
  end

  def self.view_section_sort_key(obj)
    200
  end

  def self.partial_name(obj)
    "partials/labeling/base"
  end

  def self.edit_partial_name(obj)
    "partials/labeling/edit_base"
  end

end