class Attachment < ActiveRecord::Base
  belongs_to :post

  attr_writer :data

  include ErrorRaising

  def before_save
    self.filename.gsub!(/[^a-z_\.\-0-9]/i, '_')
    self.filename.gsub!(/^\.+/, '_')
  end

  def after_save
    # Create attachment directory
    begin
      Dir.mkdir(self.dir_path)
    rescue Errno::EEXIST
    end
    # Save uploaded file to attachment directory
    File.open(self.file_path, 'w') do |f|
      f.write(@data)
    end
    @data = nil
  end

  def after_destroy
    # Delete file
    File.delete self.file_path
    # Delete directory
    Dir.delete self.dir_path
  end

  # Returns the directory of this attachment, e.g. /forum/public/attachments/12/
  def dir_path
    RAILS_ROOT + RForum::CONFIG[:attachment_path] + "/#{self.id}/"
  end

  def file_path
    self.dir_path + self.filename
  end
  
  def get_file_content
    self.reload
    File.read self.file_path
  end

  def url
    "/attachment/#{self.id}/#{self.filename}"
  end

end