#--
# Copyright (c) 2010-2014 Peter Horn & Florian Thomas, Provideal GmbH
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#++

module Tabulatr::Data::Sorting

  def apply_sorting(sortparam, default_order=nil)
    if sortparam.present?
      sort_by, orientation = sortparam.split(' ')
      klass = sort_by.split('.').first
      col_name = sort_by.split('.').last
      assoc_name = nil
      if klass == @cname
        table_name = @base.table_name
      else
        assoc_name = @base.reflect_on_association(klass.to_sym).try(:name)
        table_name = @base.reflect_on_association(klass.to_sym).try(:table_name)
      end
      nn = build_column_name(col_name, table_name: table_name, assoc_name: assoc_name, use_for: :sort)
      raise "Invalid sorting orientation" unless ['asc', 'desc'].member?(orientation.downcase)
      @relation = @relation.order("#{nn} #{orientation}")
    else
      @relation = @relation.order(default_order || "#{@table_name}.#{@base.primary_key} desc")
    end
  end

end

Tabulatr::Data.send :include, Tabulatr::Data::Sorting