# encoding: UTF-8

require "active_support/concern"

module Iqvoc
  module Inflectionals
    module LabelExtensions
      extend ActiveSupport::Concern

      included do
        attr_reader :inflectionals_attributes
        after_save :overwrite_inflectionals!
    
        after_save do |label|
          # ensure a matching inflectional exists
          if Inflectional::Base.where(:label_id => label.id, :value => label.value).none?
            label.inflectionals.create(:value => label.value)
          end
        end

        has_many :inflectionals,
            :class_name  => "Inflectional::Base",
            :foreign_key => "label_id",
            :dependent   => :destroy
      end
  
      def endings
        Inflectional::Base.for_language_and_code(language, inflectional_code)
      end

      def generate_inflectionals!
        return send(Inflectional::Base.name.to_relation_name) if base_form.blank?

        converted_literal_form = OriginMapping.replace_umlauts(value)

        diff = OriginMapping.sanitize_for_base_form(converted_literal_form).size - base_form.size

        unless base_form.blank?
          new_base_form = converted_literal_form[0..(base_form.length-1)]
        end

        Rails.logger.debug "converted_literal_form => #{converted_literal_form} (#{converted_literal_form.size}) |
        base_form => #{base_form} (#{base_form.size}) |
        new_base_form => #{new_base_form} |
        value => #{value} (#{value.size}) |
        diff => #{diff}"

        endings.each do |ending|
          value = ending == "." ? new_base_form : (new_base_form + ending.downcase)
          send(Inflectional::Base.name.to_relation_name).create!(:value => value)
        end

        self.base_form = new_base_form
        save(:validate => false)

        send(Inflectional::Base.name.to_relation_name)
      end

      def inflectionals_attributes=(str)
        @inflectionals_attributes = str.split("\r\n")
      end

      def overwrite_inflectionals!
        return unless inflectionals_attributes
        transaction do
          send(Inflectional::Base.name.to_relation_name).delete_all
          inflectionals_attributes.each do |value|
            send(Inflectional::Base.name.to_relation_name).create!(:value => value)
          end
        end
      end
      
    end
  end
end