ucberkeley/moocchat

class Condition < ActiveRecord::Base
  include HasManyInline
  has_many :tasks
  has_many :event_logs
  has_many_inline :prologue_pages, :class_name => :template
  has_many_inline :body_pages, :class_name => :template
  has_many_inline :epilogue_pages, :class_name => :template
  belongs_to :primary_activity_schema, :class_name => "ActivitySchema"
  belongs_to :time_filler, :class_name => "ActivitySchema"

  # The maximum allowable group size; experiments cannot specify chat groups
  # containing more than this number of learners.
  MAX_ALLOWABLE_GROUP_SIZE = 20

  # Human-friendly name for the condition or experiment; must be unique
  attr_accessible :name, :prologue_pages, :body_pages, :epilogue_pages,:preferred_group_size, :minimum_group_size, :body_repeat_count, :time_filler, :primary_activity_schema
  validates_presence_of :name, :primary_activity_schema
  validates_uniqueness_of :name
  validates_numericality_of(:preferred_group_size,
    :greater_than_or_equal_to => 1,
    :less_than_or_equal_to => MAX_ALLOWABLE_GROUP_SIZE)
  validates_numericality_of(:minimum_group_size,
    :greater_than_or_equal_to => 1,
    :less_than_or_equal_to => ->(condition) { condition.preferred_group_size },
    :message => 'must be between 1 and preferred group size')
  validates_numericality_of :body_repeat_count, :greater_than_or_equal_to => 1
  
  validate :at_least_one_body_page?

  def at_least_one_body_page?
    errors.add(:body_pages, 'must contain at least 1 page') if body_pages.empty?
  end

  def time_filler_questions
    return time_filler.questions
  end
end