# == Schema Information
#
# Table name: articles
#
#  id          :integer          not null, primary key
#  status      :integer          not null
#  text        :text(16777215)
#  text_coding :integer          default(0), not null
#  text_parsed :text(16777215)
#  title       :string(255)
#  version     :integer
#  created_at  :datetime
#  updated_at  :datetime
#  category_id :integer
#  user_id     :integer
#
# Indexes
#
#  index_articles_on_category_id            (category_id)
#  index_articles_on_created_at             (created_at)
#  index_articles_on_created_at_and_status  (created_at,status)
#  index_articles_on_user_id                (user_id)
#

class Article < ActiveRecord::Base
  include Exceptions
  include Extra

  STATUS_PUBLISHED = 0
  STATUS_DRAFT = 1

  RULES = 1044
  HISTORY = 401
  HOF = 402
  SPONSORS = 403
  LINKS = 404
  COMPETITIVE = 405
  PLUGIN = 426
  EXTRA = 428
  SB_RULES = 450
  G_RULES = 464
  COMPMOD = 998

  attribute :text_coding, :integer, default: CODING_HTML
  attribute :status, :integer, default: STATUS_DRAFT

  scope :recent, -> { order('created_at DESC').limit(8) }
  scope :with_comments, -> {
    select("articles.*, COUNT(C.id) AS comment_num").
    joins("LEFT JOIN comments C ON C.commentable_type = 'Article' AND C.commentable_id = articles.id").
    group("articles.id") }
  scope :ordered, ->  { order('articles.created_at DESC') }
  scope :limited, -> { limit(5) }
  scope :nodrafts, -> { where(status: STATUS_PUBLISHED) }
  scope :drafts, -> { where(status: STATUS_DRAFT) }
  scope :articles, -> { where(["category_id IN (SELECT id FROM categories WHERE domain = ?)", Category::DOMAIN_ARTICLES]) }
  # FIXME: shorter
  scope :onlynews, -> { where(category_id: Category.select(:id).where(domain: Category::DOMAIN_NEWS)) }
  scope :category, -> (cat) { where(category_id: cat) }
  scope :domain, -> (domain) { includes(:category).where("categories.domain = '?'", domain) }
  #scope :nospecial, -> { where("category_id != ?", Category::SPECIAL) }
  scope :interviews, -> { where(category_id: Category::INTERVIEWS) }

  belongs_to :user, :optional => true
  belongs_to :category, :optional => true
  has_many :comments, as: :commentable, dependent: :destroy
  has_many :files, class_name: 'DataFile', dependent: :destroy

  validates_length_of :title, :in => 1..50
  validates_length_of :text, :in => 1..16000000

  validates_presence_of :user, :category
  validate :validate_status

  before_validation :init_variables, :if => Proc.new{ |model| model.new_record? }
  before_save :format_text
  after_save :send_notifications

  has_view_count
  acts_as_readable
  acts_as_versioned

  non_versioned_columns << 'category_id'
  non_versioned_columns << 'status'
  non_versioned_columns << 'user_id'

  def to_s
    title
  end

  def previous_article
    category.articles.nodrafts.where("id < ?", self.id).order("id DESC").first
  end

  def next_article
    category.articles.nodrafts.where("id > ?", self.id).order("id ASC").first
  end

  def statuses
    {STATUS_PUBLISHED => "Published", STATUS_DRAFT => "Draft"}
  end

  def validate_status
    errors.add :status, I18n.t(:invalid_status) unless statuses.include? status
  end

  def init_variables
    self.status = STATUS_DRAFT unless user&.admin?
    self.text_coding = CODING_BBCODE if (!user&.admin? and text_coding == CODING_HTML)
  end

  def format_text
    if text_coding == CODING_BBCODE
      self.text_parsed = bbcode_to_html(text)
    elsif text_coding == CODING_MARKDOWN
      self.text_parsed = BlueCloth.new(text).to_html
    end
  end

  def send_notifications
    if (new_record? or status_changed?) and status == STATUS_PUBLISHED
      case category.domain
      when Category::DOMAIN_NEWS
        Profile.includes(:user).where("notify_news = 1").each do |p|
          Notifications.news p.user, self if p.user
        end
      when Category::DOMAIN_ARTICLES
        Profile.includes(:user).where("notify_articles = 1").each do |p|
          Notifications.article p.user, self if p.user
        end
      end
    end
  end

  # FIXME
  def remove_readings
    Reading.delete_all ["readable_type = 'Category' AND readable_id = ?", category_id]
  end

  def can_show? cuser
    status != STATUS_DRAFT or (cuser and (user == cuser or cuser.admin?))
  end

  def can_create? cuser
    cuser and !cuser.banned?(Ban::TYPE_MUTE)
  end

  def can_update? cuser, params = {}
    cuser and !cuser.banned?(Ban::TYPE_MUTE) and (cuser.admin? or (user == cuser and !params.keys.include? "status"))
  end

  def can_destroy? cuser
    cuser and cuser.admin?
  end

  def self.article_params params, cuser
    p = [:title, :category_id, :text, :text_coding]
    p << :status if cuser.admin?
    params.require(:article).permit(*p)
  end
end