class Document < ActiveRecord::Base
  
  attr_accessor :uploaded_file
  
  def after_create
    if !File.exists?(File.dirname(self.file_path))
      Dir.mkdir(File.dirname(self.file_path))
    end
    
    if @uploaded_file.instance_of?(Tempfile)
      FileUtils.copy(@uploaded_file.local_path, self.file_path)
    else
      File.open(self.file_path, "wb") { |f| f.write(@uploaded_file.read) }
    end
  end
  
  def after_destroy
    if File.exists?(self.file_path)
      File.delete(self.file_path)
    end
  end
  
  def file=(uploaded_file)
    @uploaded_file = uploaded_file
    self.file_path = sanitize_filename(@uploaded_file.original_filename)
    self.content_type = @uploaded_file.content_type
  end
  
  private
  def new_filename(file_name)
    idx = file_name.rindex "."
    self.name.gsub(/[^\w\.\_]/, '_') + file_name[idx, file_name.length - idx]
  end
  
  def sanitize_filename(file_name)
    File.expand_path("#{RAILS_ROOT}/public/documents/#{new_filename(file_name)}")
  end
  
end

class GlobalDocument < Document

  validates_uniqueness_of :name, :scope => :type
  
  private
  def sanitize_filename(file_name)
    File.expand_path("#{RAILS_ROOT}/public/documents/global/#{new_filename(file_name)}")
  end
  
end