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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 WorkflowRule < ActiveRecord::Base

  self.table_name = "#{table_name_prefix}workflows#{table_name_suffix}"

  belongs_to :role

  belongs_to :tracker

  belongs_to :old_status, :class_name => 'IssueStatus', :foreign_key => 'old_status_id'

  belongs_to :new_status, :class_name => 'IssueStatus', :foreign_key => 'new_status_id'

  validates_presence_of :role, :tracker, :old_status

  # Copies workflows from source to targets

  def self.copy(source_tracker, source_role, target_trackers, target_roles)

    unless source_tracker.is_a?(Tracker) || source_role.is_a?(Role)

      raise ArgumentError.new("source_tracker or source_role must be specified")

    end

    target_trackers = [target_trackers].flatten.compact

    target_roles = [target_roles].flatten.compact

    target_trackers = Tracker.sorted.all if target_trackers.empty?

    target_roles = Role.all if target_roles.empty?

    target_trackers.each do |target_tracker|

      target_roles.each do |target_role|

        copy_one(source_tracker || target_tracker,

                   source_role || target_role,

                   target_tracker,

                   target_role)

      end

    end

  end

  # Copies a single set of workflows from source to target

  def self.copy_one(source_tracker, source_role, target_tracker, target_role)

    unless source_tracker.is_a?(Tracker) && !source_tracker.new_record? &&

      source_role.is_a?(Role) && !source_role.new_record? &&

      target_tracker.is_a?(Tracker) && !target_tracker.new_record? &&

      target_role.is_a?(Role) && !target_role.new_record?

      raise ArgumentError.new("arguments can not be nil or unsaved objects")

    end

    if source_tracker == target_tracker && source_role == target_role

      false

    else

      transaction do

        delete_all :tracker_id => target_tracker.id, :role_id => target_role.id

        connection.insert "INSERT INTO #{WorkflowRule.table_name} (tracker_id, role_id, old_status_id, new_status_id, author, assignee, field_name, rule, type)" +

                          " SELECT #{target_tracker.id}, #{target_role.id}, old_status_id, new_status_id, author, assignee, field_name, rule, type" +

                          " FROM #{WorkflowRule.table_name}" +

                          " WHERE tracker_id = #{source_tracker.id} AND role_id = #{source_role.id}"

      end

      true

    end

  end

end