kekshd/keks

# encoding: utf-8

class Category < ActiveRecord::Base
  attr_accessible :text, :title, :ident, :released, :is_root, :answer_ids

  validates :ident, :uniqueness => true, :presence => true
  validates :title, :presence => true

  # i.e. this category has many questions and acts as parent to them
  has_many :questions, :as => :parent
  attr_readonly :questions_count

  has_and_belongs_to_many :answers

  scope :with_questions, where("questions_count > 0")
  scope :without_questions, where(questions_count: 0)
  scope :is_root, where(is_root: true)
  scope :root_categories, where(is_root: true, released: true)

  include DotTools
  include TraversalTools

  before_save do
    Rails.cache.write(:categories_last_update, Time.now)
  end

  def get_root_categories
    return [self] if is_root?
    parent_cats = answers.includes(:question).map { |a| a.get_parent_category }.uniq
    parent_cats.map { |c| c.get_root_categories }.flatten.uniq
  end

  def title_split
    s = title.split(":", 2)
    return s.size == 2 ? s : ["", title]
  end

  def link_text
    "Category #{ident}"
  end

  def trace_to_root(first = false)
    s = ""
    s << " ← C:#{title}" unless first
    return s if is_root?
    s << "\0open\0"
    answers.each do |a|
      s << a.trace_to_root
      s << "\0newline\0"
    end
    s << "\0close\0"
    s
  end

  def dot(active = false)
    id = ident.gsub('"', '')
    id = dot_strike(id) if !released?

    txt = 'K: ' + id
    bg = active ? ', style=filled, fillcolor = "#AAC6D2"' : ''
    %(#{dot_id} [label="#{txt}" #{bg}, shape=#{is_root? ? 'house' : 'folder'}];\n)
  end

  def dot_region
    d = dot(true)
    questions.each do |q|
      d << dot_link_to(self, q)
      d << dot_link_to(q, [q.subquestions, q.subcategories])
    end

    answers.each do |a|
      d << dot_link_from(a, self)
      d << dot_link_from(a.question, a)
    end

    d
  end
end