require "active_record"
require "activerecord/mlang/version"
require "active_record/mlang/text"

module ActiveRecord
  module Mlang
    def self.included(base)
      base.extend ClassMethods
      base.set_text_reflection
    end

    module ClassMethods
      def text_class_name(text_class_name=nil)
        if text_class_name
          self.text_class_name = text_class_name
        end
        @text_class_name || (self.name + "Text")
      end

      def text_class_name=(text_class_name)
        @text_class_name = text_class_name
        self.set_text_reflection
      end

      def text
        self.text_class_name.safe_constantize
      end

      def has_text?
        !!self.text
      end

      def text_attrs(*args)
        args.each do |arg|
          define_method(arg.to_sym){
            self.text.__send__(arg)
          }
        end
      end

      def has_many_fkey
        if self.text
          self.text.parent_fkey
        else
          :parent_id
        end
      end

      def set_text_reflection
        has_many :texts, class_name: self.text_class_name, foreign_key: self.has_many_fkey
      end
    end

    def text(local_or_lang_id=nil)
      return nil if !self.persisted?
      local_or_lang_id ||= I18n.locale || I18n.default_locale
      lang_id = nil
      if local_or_lang_id.kind_of? Integer
        lang_id = local_or_lang_id if Lang.exists?(id: local_or_lang_id)
      else
        lang_id = Lang[local_or_lang_id].try(:id)
      end

      return nil if !lang_id

      texts.find_or_create_by(lang_id: lang_id)
    end
  end
end

require 'active_record/mlang/lang'
require 'active_record/mlang/lang_text'
require 'active_record/mlang/railtie' if defined?(Rails::Railtie)