# Copyright 2008-2010 Universidad Politécnica de Madrid and Agora Systems S.A.
#
# This file is part of VCC (Virtual Conference Center).
#
# VCC 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.
#
# VCC 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 VCC.  If not, see <http://www.gnu.org/licenses/>.

require 'RMagick'

class EventLogo < Logo
  include Magick
  
  ASPECT_RATIO_S = "1/1"
  ASPECT_RATIO_F = 1
  
  has_attachment :max_size => 2.megabyte,
                 :storage => :file_system,
                 :content_type => :image,
                 :thumbnails => {
                   '256' => '256x256>',
                   '128' => '128x128>',
                   '96' => '96x96>',
                   '72' => '72x72>',
                   '64' => '64x64>',
                   '48' => '48x48>',
                   '32' => '32x32>',
                   '22' => '22x22>',
                   '16' => '16x16>'
                 }
                 
  validate :aspect_ratio

  def aspect_ratio
    img = Magick::Image.read(temp_path).first
    errors.add(:base, "Aspect ratio invalid. Enable javascript to crop the image easily.") unless img.rows.to_f/img.columns.to_f ==  ASPECT_RATIO_F
  end
end