# frozen_string_literal: true

# 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 WorkflowTransition < WorkflowRule
  validates_presence_of :new_status

  def self.replace_transitions(trackers, roles, transitions)
    trackers = Array.wrap trackers
    roles = Array.wrap roles

    transaction do
      records_by_status_and_scope =
        WorkflowTransition.where(:tracker_id => trackers.map(&:id), :role_id => roles.map(&:id))
                          .to_a
                          .group_by {|r| [r.old_status_id, r.new_status_id, r.tracker_id, r.role_id]}

      transitions.each do |old_status_id, transitions_by_new_status|
        transitions_by_new_status.each do |new_status_id, transition_by_rule|
          old_status_id = old_status_id.to_i
          new_status_id = new_status_id.to_i

          transition_by_rule.each do |rule, transition|
            trackers.each do |tracker|
              roles.each do |role|
                key = [old_status_id, new_status_id, tracker.id, role.id]
                w = records_by_status_and_scope[key].to_a.reject(&:destroyed?)
                if rule == 'always'
                  w = w.select {|r| !r.author && !r.assignee}
                else
                  w = w.select {|r| r.author || r.assignee}
                end
                if w.size > 1
                  w[1..-1].each(&:destroy)
                end
                w = w.first

                if ["1", true].include?(transition)
                  unless w
                    w = WorkflowTransition.
                          new(
                            :old_status_id => old_status_id,
                            :new_status_id => new_status_id,
                            :tracker => tracker,
                            :role => role
                          )
                    records_by_status_and_scope[key] ||= []
                    records_by_status_and_scope[key] << w
                  end
                  w.author = true if rule == "author"
                  w.assignee = true if rule == "assignee"
                  w.save if w.changed?
                elsif w
                  if rule == 'always'
                    w.destroy
                  elsif rule == 'author'
                    if w.assignee
                      w.author = false
                      w.save if w.changed?
                    else
                      w.destroy
                    end
                  elsif rule == 'assignee'
                    if w.author
                      w.assignee = false
                      w.save if w.changed?
                    else
                      w.destroy
                    end
                  end
                end
              end
            end
          end
        end
      end
    end
  end
end