class Answer < ActiveRecord::Base

  ##
  # Associations
	belongs_to :question
	belongs_to :user
	belongs_to :plan
  has_many :notes, dependent: :destroy
  has_and_belongs_to_many :question_options, join_table: "answers_question_options"

  has_many :notes

  ##
  # Possibly needed for active_admin
  #   -relies on protected_attributes gem as syntax depricated in rails 4.2
  attr_accessible :text, :plan_id, :lock_version, :question_id, :user_id, :question_option_ids,
                  :question, :user, :plan, :question_options, :notes, :note_ids, :id,
                  :as => [:default, :admin]

  ##
  # Validations
#  validates :user, :plan, :question, presence: true
#
#  # Make sure there is only one answer per question!
#  validates :question, uniqueness: {scope: [:plan],
#                                    message: I18n.t('helpers.answer.only_one_per_question')}
#
#  # The answer MUST have a text value if the question is NOT option based or a question_option if
#  # it is option based.
#  validates :text, presence: true, if: Proc.new{|a|
#    (a.question.nil? ? false : !a.question.question_format.option_based?)
#  }
#  validates :question_options, presence: true, if: Proc.new{|a|
#    (a.question.nil? ? false : a.question.question_format.option_based?)
#  }
#
#  # Make sure the plan and question are associated with the same template!
#  validates :plan, :question, answer_for_correct_template: true

  ##
  # deep copy the given answer
  #
  # @params [Answer] question_option to be deep copied
  # @return [Answer] the saved, copied answer
  def self.deep_copy(answer)
    answer_copy = answer.dup
    answer.question_options.each do |opt|
      answer_copy.question_options << opt
    end
    answer_copy.save!
    return answer_copy
  end
  
  # This method helps to decide if an answer option (:radiobuttons, :checkbox, etc ) in form views should be checked or not
  # Returns true if the given option_id is present in question_options, otherwise returns false
  def has_question_option(option_id)
    self.question_option_ids.include?(option_id)
  end

  # Returns true if the answer is valid and false otherwise. If the answer's question is option_based, it is checked if exist
  # any question_option selected. For non option_based (e.g. textarea or textfield), it is checked the presence of text
  def is_valid?
    if self.question.present?
      if self.question.question_format.option_based?
        return !self.question_options.empty?
      else  # (e.g. textarea or textfield question formats)
        return self.text.present?
      end
    end
    return false
  end
  # Returns all the notes for an instance answer whose archived is nil or false. The Array is ordered by updated_at (descending)
  def non_archived_notes
    answer = Answer.includes(:notes).where({ id: self.id, notes: { archived: [nil, false] } }).order('notes.updated_at DESC').first
    if !answer.nil?
      return answer.notes.to_a
    end
    return []
  end
end