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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 Board < ActiveRecord::Base

  include Redmine::SafeAttributes

  belongs_to :project

  has_many :topics, :class_name => 'Message', :conditions => "#{Message.table_name}.parent_id IS NULL", :order => "#{Message.table_name}.created_on DESC"

  has_many :messages, :dependent => :destroy, :order => "#{Message.table_name}.created_on DESC"

  belongs_to :last_message, :class_name => 'Message', :foreign_key => :last_message_id

  acts_as_tree :dependent => :nullify

  acts_as_list :scope => '(project_id = #{project_id} AND parent_id #{parent_id ? "= #{parent_id}" : "IS NULL"})'

  acts_as_watchable

  validates_presence_of :name, :description

  validates_length_of :name, :maximum => 30

  validates_length_of :description, :maximum => 255

  validate :validate_board

  scope :visible, lambda {|*args| { :include => :project,

                                          :conditions => Project.allowed_to_condition(args.shift || User.current, :view_messages, *args) } }

  safe_attributes 'name', 'description', 'parent_id', 'move_to'

  def visible?(user=User.current)

    !user.nil? && user.allowed_to?(:view_messages, project)

  end

  def reload(*args)

    @valid_parents = nil

    super

  end

  def to_s

    name

  end

  def valid_parents

    @valid_parents ||= project.boards - self_and_descendants

  end

  def reset_counters!

    self.class.reset_counters!(id)

  end

  # Updates topics_count, messages_count and last_message_id attributes for +board_id+

  def self.reset_counters!(board_id)

    board_id = board_id.to_i

    update_all("topics_count = (SELECT COUNT(*) FROM #{Message.table_name} WHERE board_id=#{board_id} AND parent_id IS NULL)," +

               " messages_count = (SELECT COUNT(*) FROM #{Message.table_name} WHERE board_id=#{board_id})," +

               " last_message_id = (SELECT MAX(id) FROM #{Message.table_name} WHERE board_id=#{board_id})",

               ["id = ?", board_id])

  end

  def self.board_tree(boards, parent_id=nil, level=0)

    tree = []

    boards.select {|board| board.parent_id == parent_id}.sort_by(&:position).each do |board|

      tree << [board, level]

      tree += board_tree(boards, board.id, level+1)

    end

    if block_given?

      tree.each do |board, level|

        yield board, level

      end

    end

    tree

  end

  protected

  def validate_board

    if parent_id && parent_id_changed?

      errors.add(:parent_id, :invalid) unless valid_parents.include?(parent)

    end

  end

end