##
# This class represents a conference

class Conference < ActiveRecord::Base
  attr_accessible :title, :short_title, :social_tag, :contact_email, :timezone, :html_export_path,
                  :start_date, :end_date, :rooms_attributes, :tracks_attributes, :dietary_choices_attributes,
                  :use_dietary_choices, :use_supporter_levels, :supporter_levels_attributes, :social_events_attributes,
                  :event_types_attributes, :registration_start_date, :registration_end_date, :logo,
		              :questions_attributes, :question_ids, :answers_attributes, :answer_ids,
                  :difficulty_levels_attributes, :use_difficulty_levels,
                  :use_vpositions, :use_vdays, :vdays_attributes, :vpositions_attributes, :use_volunteers,
                  :media_id, :media_type, :color, :description

  has_paper_trail

  has_and_belongs_to_many :questions

  has_one :email_settings, :dependent => :destroy
  has_one :call_for_papers, :dependent => :destroy
  has_many :social_events, :dependent => :destroy
  has_many :supporter_registrations, :dependent => :destroy
  has_many :supporter_levels, :dependent => :destroy
  has_many :dietary_choices, :dependent => :destroy
  has_many :events, :dependent => :destroy
  has_many :event_types, :dependent => :destroy
  has_many :tracks, :dependent => :destroy
  has_many :difficulty_levels, :dependent => :destroy
  has_many :rooms, :dependent => :destroy
  has_many :registrations, :dependent => :destroy
  has_many :vdays, :dependent => :destroy
  has_many :vpositions, :dependent => :destroy
  has_many :vchoices, :dependent => :destroy

  belongs_to :venue

  accepts_nested_attributes_for :rooms, :reject_if => proc {|r| r["name"].blank?}, :allow_destroy => true
  accepts_nested_attributes_for :tracks, :reject_if => proc {|r| r["name"].blank?}, :allow_destroy => true
  accepts_nested_attributes_for :difficulty_levels, :allow_destroy => true
  accepts_nested_attributes_for :social_events, :allow_destroy => true
  accepts_nested_attributes_for :venue
  accepts_nested_attributes_for :dietary_choices, :allow_destroy => true
  accepts_nested_attributes_for :supporter_levels, :allow_destroy => true
  accepts_nested_attributes_for :event_types, :allow_destroy => true
  accepts_nested_attributes_for :email_settings
  accepts_nested_attributes_for :questions, :allow_destroy => true
  accepts_nested_attributes_for :vdays, :allow_destroy => true
  accepts_nested_attributes_for :vpositions, :allow_destroy => true

  has_attached_file :logo,
                    :styles => {:thumb => "100x100>", :large => "300x300>" }

  validates_attachment_content_type :logo,
                                    :content_type => [/jpg/, /jpeg/, /png/, /gif/],
                                    :size => { :in => 0..500.kilobytes }

  validates_presence_of :title,
                        :short_title,
                        :social_tag,
                        :start_date,
                        :end_date
  validates_uniqueness_of :short_title
  validates_format_of :short_title, :with => /\A[a-zA-Z0-9_-]*\z/
  before_create :generate_guid
  before_create :create_venue
  before_create :create_email_settings

  def self.media_types
    media_types = {:youtube => 'YouTube', :slideshare => 'SlideShare',  :flickr => 'Flickr', :vimeo => 'Vimeo', :speakerdeck => 'Speakerdeck', :instagram => 'Instagram'}
    return media_types
  end


  ##
  # Checks if the user is registered to the conference
  #
  # ====Args
  # * +user+ -> The user we check for 
  # ====Returns
  # * +nil+ -> If the user doesn't exist
  # * +false+ -> If the user is registered
  # * +true+ - If the user isn't registered
  def user_registered? user
    return nil if user.nil?
    return nil if user.person.nil?

    if self.registrations.where(:person_id => user.person.id).count == 0
      logger.debug("User #{user.email} isn't registered to self.title")
      return false
    else
      return true
    end
  end

  ##
  # Checks if the registration for the conference is currently open
  #
  # ====Returns
  # * +false+ -> If the conference dates are not set or today isn't in the
  #   registration period.
  # * +true+ -> If today is in the registration period.
  def registration_open?
    today = Date.current
    if self.registration_start_date.blank? ||  self.registration_end_date.blank?
      false
    end

    (registration_start_date..registration_end_date).cover?(today)
  end

  ##
  # Checks if the call for papers for the conference is currently open
  #
  # ====Returns
  # * +false+ -> If the CFP is not set or today isn't in the CFP period.
  # * +true+ -> If today is in the CFP period.
  def cfp_open?
    today = Date.current
    cfp = self.call_for_papers
    if !cfp.nil? && (cfp.start_date.. cfp.end_date).cover?(today)
      return true
    end

    return false
  end

  private

  ##
  # Creates a venue and sets self.venue_id to it's id. Used as before_create.
  #
  def create_venue
    self.venue_id = Venue.create.id
    true
  end

  ##
  # Creates a EmailSettings association proxy. Used as before_create.
  #
  def create_email_settings
    build_email_settings
    true
  end

  ##
  # Creates a UID for the conference. Used as before_create.
  #
  def generate_guid
    begin
      guid = SecureRandom.urlsafe_base64
    end while Person.where(:guid => guid).exists?
    self.guid = guid
  end

end