class Event < ActiveRecord::Base
  TAG_RE = /\[[^]]+\]/

  belongs_to :item
  has_many   :bookings

  before_create :generate_color

  validates_presence_of :title, :message => "Le titre ne peut pas être vide"
  validates_length_of   :title, :within => 4...140,
                        :message => "Le titre doit faire entre 4 et 140 caractères"

  def generate_color
    digest = Digest::MD5.hexdigest(title =~ TAG_RE ? $~.to_s : self.title)

    self.color = "##{digest[0...6]}"
  end

  def upcoming_bookings
    self.bookings.
      find(:all, :conditions => ['start_at >= ?', Date.today.at_midnight])
  end

  def anchor
    'event-%s' % id.to_s(16)
  end

  def bookings_between(lower, upper)
    bookings_range(lower.at_midnight, 1.day.since(upper).at_midnight - 1)
  end

  private
    def bookings_range(lower, upper)
      self.bookings.find :all,
        :conditions => ['start_at >= ? AND end_at <= ?', lower, upper]
    end
end