class Note < ActiveRecord::Base
  include GeoRecord

  has_many :comments, -> { where(:visible => true).order(:created_at) }, :class_name => "NoteComment", :foreign_key => :note_id

  validates :id, :uniqueness => true, :presence => { :on => :update },
                 :numericality => { :on => :update, :integer_only => true }
  validates :latitude, :longitude, :numericality => { :only_integer => true }
  validates :closed_at, :presence => true, :if => proc { :status == "closed" }
  validates :status, :inclusion => %w(open closed hidden)

  validate :validate_position

  scope :visible, -> { where("status != 'hidden'") }
  scope :invisible, -> { where("status = 'hidden'") }

  after_initialize :set_defaults

  # Sanity check the latitude and longitude and add an error if it's broken
  def validate_position
    errors.add(:base, "Note is not in the world") unless in_world?
  end

  # Close a note
  def close
    self.status = "closed"
    self.closed_at = Time.now.getutc
    save
  end

  # Reopen a note
  def reopen
    self.status = "open"
    self.closed_at = nil
    save
  end

  # Check if a note is visible
  def visible?
    status != "hidden"
  end

  # Check if a note is closed
  def closed?
    !closed_at.nil?
  end

  # Return the author object, derived from the first comment
  def author
    comments.first.author
  end

  # Return the author IP address, derived from the first comment
  def author_ip
    comments.first.author_ip
  end

  private

  # Fill in default values for new notes
  def set_defaults
    self.status = "open" unless attribute_present?(:status)
  end
end