# -*- encoding : utf-8 -*-
# Wiki UFC
# Copyright (C) 2007, Adriano, Alinson, Andre, Rafael e Bustamante
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

class Course < ActiveRecord::Base

  acts_as_paranoid

  has_many :attachments,
      :order => 'path is not null, path, file_name',
      :dependent => :destroy

  has_many :events,
      :order => 'time asc',
      :dependent => :destroy

  has_many :news,
      :foreign_key => 'receiver_id',
      :order => 'id desc',
      :class_name => 'News',
      :dependent => :destroy

  has_many :log_entries,
      :order => 'created_at desc',
      :dependent => :destroy

  has_many :wiki_pages,
      :order => 'position',
      :dependent => :destroy

  has_and_belongs_to_many :users,
      :order => 'last_seen desc'

  validates_presence_of :short_name
  validates_presence_of :full_name
  validates_presence_of :code
  validates_numericality_of :grade, :only_integer => true
  validates_inclusion_of :hidden, :in => [true, false], :allow_nil => false
  validates_format_of :short_name, :with => /^[^0-9]/

  after_create :add_initial_wiki_pages

  def related_courses
    Course.all(:conditions => ['short_name = ?', self.short_name], :limit => 4,
        :order => 'period desc')
  end

  def recent_news
    self.news.all(:conditions => ['timestamp > ?', 7.days.ago])
  end

  def add_initial_wiki_pages
    App.initial_wiki_pages.each do |page_title|
      wiki_page = WikiPage.new(:title => page_title, :description => 'New course',
          :content => App.initial_wiki_page_content)
      wiki_page.user = User.first
      self.wiki_pages << wiki_page
      wiki_page.save!
    end
  end

  def to_param
    return self.short_name if self.period == App.current_period
    return self.id.to_s
  end
end