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# redMine - project management software

# Copyright (C) 2006-2007  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

  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_list :scope => :project_id

  acts_as_watchable

  validates_presence_of :name, :description

  validates_length_of :name, :maximum => 30

  validates_length_of :description, :maximum => 255

  def visible?(user=User.current)

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

  end

  def to_s

    name

  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

end