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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 Message < ActiveRecord::Base

  include Redmine::SafeAttributes

  belongs_to :board

  belongs_to :author, :class_name => 'User', :foreign_key => 'author_id'

  acts_as_tree :counter_cache => :replies_count, :order => "#{Message.table_name}.created_on ASC"

  acts_as_attachable

  belongs_to :last_reply, :class_name => 'Message', :foreign_key => 'last_reply_id'

  acts_as_searchable :columns => ['subject', 'content'],

                     :include => {:board => :project},

                     :project_key => "#{Board.table_name}.project_id",

                     :date_column => "#{table_name}.created_on"

  acts_as_event :title => Proc.new {|o| "#{o.board.name}: #{o.subject}"},

                :description => :content,

                :type => Proc.new {|o| o.parent_id.nil? ? 'message' : 'reply'},

                :url => Proc.new {|o| {:controller => 'messages', :action => 'show', :board_id => o.board_id}.merge(o.parent_id.nil? ? {:id => o.id} :

                                                                                                                                       {:id => o.parent_id, :r => o.id, :anchor => "message-#{o.id}"})}

  acts_as_activity_provider :find_options => {:include => [{:board => :project}, :author]},

                            :author_key => :author_id

  acts_as_watchable

  validates_presence_of :board, :subject, :content

  validates_length_of :subject, :maximum => 255

  validate :cannot_reply_to_locked_topic, :on => :create

  after_create :add_author_as_watcher, :reset_counters!

  after_update :update_messages_board

  after_destroy :reset_counters!

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

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

  safe_attributes 'subject', 'content'

  safe_attributes 'locked', 'sticky', 'board_id',

    :if => lambda {|message, user|

      user.allowed_to?(:edit_messages, message.project)

    }

  def visible?(user=User.current)

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

  end

  def cannot_reply_to_locked_topic

    # Can not reply to a locked topic

    errors.add :base, 'Topic is locked' if root.locked? && self != root

  end

  def update_messages_board

    if board_id_changed?

      Message.update_all("board_id = #{board_id}", ["id = ? OR parent_id = ?", root.id, root.id])

      Board.reset_counters!(board_id_was)

      Board.reset_counters!(board_id)

    end

  end

  def reset_counters!

    if parent && parent.id

      Message.update_all({:last_reply_id => parent.children.maximum(:id)}, {:id => parent.id})

    end

    board.reset_counters!

  end

  def sticky=(arg)

    write_attribute :sticky, (arg == true || arg.to_s == '1' ? 1 : 0)

  end

  def sticky?

    sticky == 1

  end

  def project

    board.project

  end

  def editable_by?(usr)

    usr && usr.logged? && (usr.allowed_to?(:edit_messages, project) || (self.author == usr && usr.allowed_to?(:edit_own_messages, project)))

  end

  def destroyable_by?(usr)

    usr && usr.logged? && (usr.allowed_to?(:delete_messages, project) || (self.author == usr && usr.allowed_to?(:delete_own_messages, project)))

  end

  private

  def add_author_as_watcher

    Watcher.create(:watchable => self.root, :user => author)

  end

end