class WikiPage < ActiveRecord::Base
  before_save :normalize_title
  before_create :initialize_creator
  after_save :create_version
  belongs_to :creator, :class_name => "User"
  validates_uniqueness_of :title, :case_sensitive => false
  validates_presence_of :title
  validate :validate_locker_is_janitor
  attr_accessible :title, :body, :is_locked
  scope :titled, lambda {|title| where(["title = ?", title.downcase.tr(" ", "_")])}
  scope :recent, order("updated_at DESC").limit(25)
  has_one :tag, :foreign_key => "name", :primary_key => "title"
  has_one :artist, :foreign_key => "name", :primary_key => "title"
  has_many :versions, :class_name => "WikiPageVersion", :dependent => :destroy, :order => "wiki_page_versions.id ASC"
  
  def self.build_relation(options = {})
    relation = where()
    
    if options[:title]
      relation = relation.where(["title LIKE ? ESCAPE E'\\\\'", options[:title].downcase.tr(" ", "_").to_escaped_for_sql_like])
    end
    
    if options[:creator_id]
      relation = relation.where(["creator_id = ?", options[:creator_id]])
    end
    
    relation
  end
  
  def self.find_title_and_id(title)
    titled(title).select("title, id").first
  end
  
  def validate_locker_is_janitor
    if is_locked_changed? && !CurrentUser.is_janitor?
      errors.add(:is_locked, "can be modified by janitors only")
      return false
    end
  end
  
  def revert_to(version)
    self.title = version.title
    self.body = version.body
    self.is_locked = version.is_locked
  end
  
  def revert_to!(version)
    revert_to(version)
    save!
  end

  def normalize_title
    self.title = title.downcase.tr(" ", "_")
  end

  def creator_name
    User.id_to_name(user_id).tr("_", " ")
  end
  
  def category_name
    Tag.category_for(title)
  end

  def pretty_title
    title.tr("_", " ")
  end
  
  def create_version
    if title_changed? || body_changed? || is_locked_changed?
      versions.create(
        :updater_id => CurrentUser.user.id,
        :updater_ip_addr => CurrentUser.ip_addr,
        :title => title,
        :body => body,
        :is_locked => is_locked
      )
    end
  end
  
  def initialize_creator
    self.creator_id = CurrentUser.user.id
  end
  
  def post_set
    @post_set ||= PostSets::Post.new(title)
  end
  
  def presenter
    @presenter ||= WikiPagePresenter.new(self)
  end
end