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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 Workflow < ActiveRecord::Base

  belongs_to :role

  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, :old_status, :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 #{Workflow.table_name} GROUP BY role_id, tracker_id")

    roles = Role.find(:all, :order => 'builtin, position')

    trackers = Tracker.find(:all, :order => 'position')

    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

  # Find potential statuses the user could be allowed to switch issues to

  def self.available_statuses(project, user=User.current)

    Workflow.find(:all,

                  :include => :new_status,

                  :conditions => {:role_id => user.roles_for_project(project).collect(&:id)}).

      collect(&:new_status).

      compact.

      uniq.

      sort

  end

  # 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.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 #{Workflow.table_name} (tracker_id, role_id, old_status_id, new_status_id)" +

                          " SELECT #{target_tracker.id}, #{target_role.id}, old_status_id, new_status_id" +

                          " FROM #{Workflow.table_name}" +

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

      end

      true

    end

  end

end