# redMine - project management software
# Copyright (C) 2006  Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

class Enumeration < ActiveRecord::Base
  acts_as_list :scope => 'opt = \'#{opt}\''

  before_destroy :check_integrity
  
  validates_presence_of :opt, :name
  validates_uniqueness_of :name, :scope => [:opt]
  validates_length_of :name, :maximum => 30
  validates_format_of :name, :with => /^[\w\s\'\-]*$/i

  OPTIONS = {
    "IPRI" => :enumeration_issue_priorities,
    "DCAT" => :enumeration_doc_categories,
    "ACTI" => :enumeration_activities
  }.freeze
  
  def self.get_values(option)
    find(:all, :conditions => {:opt => option}, :order => 'position')
  end
  
  def self.default(option)  
    find(:first, :conditions => {:opt => option, :is_default => true}, :order => 'position')
  end

  def option_name
    OPTIONS[self.opt]
  end

  def before_save
    Enumeration.update_all("is_default = #{connection.quoted_false}", {:opt => opt}) if is_default?
  end
  
  def <=>(enumeration)
    position <=> enumeration.position
  end
  
  def to_s; name end
  
private
  def check_integrity
    case self.opt
    when "IPRI"
      raise "Can't delete enumeration" if Issue.find(:first, :conditions => ["priority_id=?", self.id])
    when "DCAT"
      raise "Can't delete enumeration" if Document.find(:first, :conditions => ["category_id=?", self.id])
    when "ACTI"
      raise "Can't delete enumeration" if TimeEntry.find(:first, :conditions => ["activity_id=?", self.id])
    end
  end
end
