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# 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

  default_scope :order => "#{Enumeration.table_name}.position ASC"

  belongs_to :project

  acts_as_list :scope => 'type = \'#{type}\''

  acts_as_customizable

  acts_as_tree :order => 'position ASC'

  before_destroy :check_integrity

  validates_presence_of :name

  validates_uniqueness_of :name, :scope => [:type, :project_id]

  validates_length_of :name, :maximum => 30

  named_scope :shared, :conditions => { :project_id => nil }

  named_scope :active, :conditions => { :active => true }

  def self.default

    # Creates a fake default scope so Enumeration.default will check

    # it's type.  STI subclasses will automatically add their own

    # types to the finder.

    if self.descends_from_active_record?

      find(:first, :conditions => { :is_default => true, :type => 'Enumeration' })

    else

      # STI classes are

      find(:first, :conditions => { :is_default => true })

    end

  end

  # Overloaded on concrete classes

  def option_name

    nil

  end

  def before_save

    if is_default? && is_default_changed?

      Enumeration.update_all("is_default = #{connection.quoted_false}", {:type => type})

    end

  end

  # Overloaded on concrete classes

  def objects_count

    0

  end

  def in_use?

    self.objects_count != 0

  end

  # Is this enumeration overiding a system level enumeration?

  def is_override?

    !self.parent.nil?

  end

  alias :destroy_without_reassign :destroy

  # Destroy the enumeration

  # If a enumeration is specified, objects are reassigned

  def destroy(reassign_to = nil)

    if reassign_to && reassign_to.is_a?(Enumeration)

      self.transfer_relations(reassign_to)

    end

    destroy_without_reassign

  end

  def <=>(enumeration)

    position <=> enumeration.position

  end

  def to_s; name end

  # Returns the Subclasses of Enumeration.  Each Subclass needs to be

  # required in development mode.

  #

  # Note: subclasses is protected in ActiveRecord

  def self.get_subclasses

    @@subclasses[Enumeration]

  end

  # Does the +new+ Hash override the previous Enumeration?

  def self.overridding_change?(new, previous)

    if (same_active_state?(new['active'], previous.active)) && same_custom_values?(new,previous)

      return false

    else

      return true

    end

  end

  # Does the +new+ Hash have the same custom values as the previous Enumeration?

  def self.same_custom_values?(new, previous)

    previous.custom_field_values.each do |custom_value|

      if custom_value.value != new["custom_field_values"][custom_value.custom_field_id.to_s]

        return false

      end

    end

    return true

  end

  # Are the new and previous fields equal?

  def self.same_active_state?(new, previous)

    new = (new == "1" ? true : false)

    return new == previous

  end

private

  def check_integrity

    raise "Can't delete enumeration" if self.in_use?

  end

end

# Force load the subclasses in development mode

require_dependency 'time_entry_activity'

require_dependency 'document_category'

require_dependency 'issue_priority'