class User < ActiveRecord::Base

  cattr_reader :per_page
  @@per_page = 20

  before_validation :strip_and_and_put_to_lowercase

  has_many :search_keywords
  has_many :article_statuses

  has_many :sent_articles,
    :through => :article_statuses,
    :source => :article,
    :conditions => "status = '#{ArticleStatus::STATUS_SENT}'",
    :order => :created_at

  has_many :viewed_articles,
    :through => :article_statuses,
    :source => :article,
    :conditions => "status ='#{ArticleStatus::STATUS_VIEWED}'",
    :order => :created_at

  USERNAME_MIN_LENGTH = 4
  USERNAME_MAX_LENGTH = 20
  PASSWORD_MIN_LENGTH = 4
  PASSWORD_MAX_LENGTH = 40
  EMAIL_MAX_LENGTH = 50
  USERNAME_RANGE = USERNAME_MIN_LENGTH..USERNAME_MAX_LENGTH
  PASSWORD_RANGE = PASSWORD_MIN_LENGTH..PASSWORD_MAX_LENGTH
  MAX_NUMBER_OF_ARTICLES_PER_NEWSUPDATE = 10
  MAX_SIZE_OF_A_MAIL_IN_CHARACTERS = 10000
  NEWSUPDATE_RECENT_NUMBER_OF_DAYS = 120

=begin
  validates_uniqueness_of :username, :email
  validates_confirmation_of :password
  validates_length_of :username, :within => USERNAME_RANGE
  validates_length_of :password, :within => PASSWORD_RANGE
  validates_length_of :email, :maximum => EMAIL_MAX_LENGTH

  validates_format_of :username,
                      :with => /^[a-z_][a-z0-9_]*$/,
                      :message => I18n.t(:given_username_is_not_correct_validation_error)
  validates_format_of :email,
                      :with => /^[A-Z0-9._%-]+@([A-Z0-9-]+\.)+[A-Z]{2,4}$/i,
                      :message => I18n.t(:given_email_is_not_correct_validation_error)
=end

  acts_as_authentic
  acts_as_authorization_subject

  #FIXME: is not unittested
  def post_recent_news
    recent_articles = collect_recent_articles do |article|
      article.size <= User::MAX_SIZE_OF_A_MAIL_IN_CHARACTERS
    end
    recent_articles.each do |article|
      UserMailer.deliver_newsupdate(self, article)
      article.set_user_status(self, ArticleStatus::STATUS_SENT)
      logger.info <<-EOF
      Email notification about article #{article.title} was sent to #{self.username},
      address #{self.email}
      EOF
    end
  end

  def self.post_recent_news_for_every_user
    logger.info 'Starting to send the recent news for every user through email.'
    User.all.each do |user|
      user.post_recent_news
    end
    logger.info 'Sending recent news for every user finished.'
  end

  def collect_recent_articles(&article_condition)
    Sunspot.commit_if_dirty
=begin
    searchquery = search_keywords.map do |search_keyword|
      "(#{search_keyword.query})"
    end.join(' OR ')
    search = Sunspot.search(Article) do
      keywords searchquery
      with(:published_at).greater_than Time.now - NEWSUPDATE_RECENT_NUMBER_OF_DAYS.day
      dynamic :status do
        without Article.give_user_status_symbol(self, ArticleStatus::STATUS_VIEWED), true
        without Article.give_user_status_symbol(self, ArticleStatus::STATUS_SENT), true
      end
      order_by(:published_at, :desc)
      paginate(:page => 1, :per_page => MAX_NUMBER_OF_ARTICLES_PER_NEWSUPDATE)
    end
    search.results
=end
    set_all_articles = Set.new
    search_keywords.each do |search_keyword|
      article_update = recent_articles_for_search_keyword(search_keyword)
      set_all_articles += article_update
    end
    arr_all_articles = set_all_articles.to_a
    arr_all_articles = arr_all_articles.find_all { |article| article_condition.call(article) } if article_condition
    arr_all_articles.sort! { |article1, article2| article2.published_at <=> article1.published_at }
    arr_all_articles = arr_all_articles[0, MAX_NUMBER_OF_ARTICLES_PER_NEWSUPDATE]
    arr_all_articles
  end

  def recent_articles_for_search_keyword(search_keyword)
    searchquery = search_keyword.query
    search = Sunspot.search(Article) do
      keywords searchquery
      with(:published_at).greater_than Time.now - NEWSUPDATE_RECENT_NUMBER_OF_DAYS.day
      dynamic :status do
        without Article.give_user_status_symbol(self, ArticleStatus::STATUS_VIEWED), true
        without Article.give_user_status_symbol(self, ArticleStatus::STATUS_SENT), true
      end
      order_by(:published_at, :desc)
      paginate(:page => 1, :per_page => MAX_NUMBER_OF_ARTICLES_PER_NEWSUPDATE)
    end
    search.results
  end

  def can_be_modified_by(user)
    !user.nil? and (user==self or user.has_role?(:admin))
  end

  private

  def strip_and_and_put_to_lowercase
    self.email.strip!
    self.email.downcase!
  end

end