class CreateEvents < ActiveRecord::Migration
  def self.up
    create_table :events do |t|
      t.string :type
      t.integer :user_id
      t.integer :course_id
      t.timestamps
    end
  end

  def self.down
    drop_table :events
  end
end

##

class Event < ActiveRecord::Base
  belongs_to :user
  belongs_to :course

  named_scope :current_events, :order => "created_at DESC", :include => [:user, :course]
end

##

class NewCourseEvent < Event
  validates_presence_of :course_id
end

##

class NewRegistrationEvent < Event
  validates_presence_of :user_id, :course_id
end

## module EventsHelper
  def event_text(event)
    case event[:type]
    when 'NewCourseEvent'       then "#{link_to h(event.course.name), course_path(event.course)} has been added to the course catalog!"
    when 'NewUserEvent'         then "#{h(event.user.username)} has joined ilmo!"
    when 'NewRegistrationEvent' then "#{h(event.user.username)} is attending #{link_to h(event.course.name), course_path(event.course)}"
    end
  end
end