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# Redmine - project management software

# Copyright (C) 2006-2012  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 IssuePriority < Enumeration

  has_many :issues, :foreign_key => 'priority_id'

  after_destroy {|priority| priority.class.compute_position_names}

  after_save {|priority| priority.class.compute_position_names if priority.position_changed? && priority.position}

  OptionName = :enumeration_issue_priorities

  def option_name

    OptionName

  end

  def objects_count

    issues.count

  end

  def transfer_relations(to)

    issues.update_all("priority_id = #{to.id}")

  end

  def css_classes

    "priority-#{id} priority-#{position_name}"

  end

  # Clears position_name for all priorities

  # Called from migration 20121026003537_populate_enumerations_position_name

  def self.clear_position_names

    update_all :position_name => nil

  end

  # Updates position_name for active priorities

  # Called from migration 20121026003537_populate_enumerations_position_name

  def self.compute_position_names

    priorities = where(:active => true).all.sort_by(&:position)

    if priorities.any?

      default = priorities.detect(&:is_default?) || priorities[(priorities.size - 1) / 2]

      priorities.each_with_index do |priority, index|

        name = case

          when priority.position == default.position

            "default"

          when priority.position < default.position

            index == 0 ? "lowest" : "low#{index+1}"

          else

            index == (priorities.size - 1) ? "highest" : "high#{priorities.size - index}"

          end

        update_all({:position_name => name}, :id => priority.id)

      end

    end

  end

end