class Topic < ActiveRecord::Base
  belongs_to :forum, :counter_cache => true
  belongs_to :user
  has_many :monitorships
  has_many :monitors, :through => :monitorships, :conditions => ['monitorships.active = ?', true], :source => :user, :order => 'users.display_name'

  has_many :posts, :order => 'posts.created_at', :dependent => :destroy do
    def last
      @last_post ||= find(:first, :order => 'posts.created_at desc')
    end
  end

  belongs_to :replied_by_user, :foreign_key => "replied_by", :class_name => "User"

  validates_presence_of :forum, :user, :title
  validate :title_cannot_contain_blacklisted_strings

  before_create :set_default_replied_at_and_sticky
  after_save    :set_post_topic_id

  attr_accessible :title
  # to help with the create form
  attr_accessor :body

  def voices
    posts.map { |p| p.user_id }.uniq.size
  end

  def hit!
    self.class.increment_counter :hits, id
  end

  def sticky?() sticky == 1 end

  def views() hits end

  def paged?(per_page = 25) posts_count > per_page.to_i end

  def last_page(per_page = 25)
    per_page = per_page.to_f
    per_page = 25.0 if (per_page < 1)
    (posts_count.to_f / per_page).ceil.to_i
  end

  def editable_by?(user)
    user && (user.id == user_id || user.admin? || user.moderator_of?(forum_id))
  end

  protected
    def set_default_replied_at_and_sticky
      self.replied_at = Time.now.utc
      self.sticky   ||= 0
    end

    def set_post_topic_id
      Post.update_all ['forum_id = ?', forum_id], ['topic_id = ?', id]
    end

    def title_cannot_contain_blacklisted_strings
      downcase_title = title.downcase rescue ''
      blacklist      = Blacklist.find(:first).title_list rescue ''
      prohibited     = false

      blacklist.split("\n").each do |item|
        if downcase_title.include?(item)
          prohibited = true
          break
        end
      end

      errors.add(:title, "contains prohibited text") if prohibited == true
    end
end