# Redmine - project management software
# Copyright (C) 2006-2014  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

  # Returns workflow transitions count by tracker and role
  def self.count_by_tracker_and_role
    counts = connection.select_all("SELECT role_id, tracker_id, count(id) AS c FROM #{table_name} WHERE type = 'WorkflowTransition' GROUP BY role_id, tracker_id")
    roles = Role.sorted.all
    trackers = Tracker.sorted.all

    result = []
    trackers.each do |tracker|
      t = []
      roles.each do |role|
        row = counts.detect {|c| c['role_id'].to_s == role.id.to_s && c['tracker_id'].to_s == tracker.id.to_s}
        t << [role, (row.nil? ? 0 : row['c'].to_i)]
      end
      result << [tracker, t]
    end

    result
  end

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

    transaction do
      records = WorkflowTransition.where(:tracker_id => trackers.map(&:id), :role_id => roles.map(&:id)).all

      transitions.each do |old_status_id, transitions_by_new_status|
        transitions_by_new_status.each do |new_status_id, transition_by_rule|
          transition_by_rule.each do |rule, transition|
            trackers.each do |tracker|
              roles.each do |role|
                w = records.select {|r|
                  r.old_status_id == old_status_id.to_i &&
                  r.new_status_id == new_status_id.to_i &&
                  r.tracker_id == tracker.id &&
                  r.role_id == role.id &&
                  !r.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 transition == "1" || transition == true
                  unless w
                    w = WorkflowTransition.new(:old_status_id => old_status_id, :new_status_id => new_status_id, :tracker_id => tracker.id, :role_id => role.id)
                    records << 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