require 'ftools'
require 'RMagick'

module SlideshowUpload
  @@image_types = ['image/jpeg', 'image/pjpeg', 'image/gif', 'image/png', 'image/x-png', 'image/jpg']
  @@slideshows_path = File.join(RAILS_ROOT, 'slideshows')

  mattr_reader :image_types, :slideshows_path, :file_data
  mattr_accessor :slideshow_path

  def self.included(base)
    base.send :extend, ImageProcessor

    base.class_eval do
      after_save :write_file
      after_destroy :destroy_images
    end
  end

  def image_data=(file_data)
    return nil if file_data.nil? || file_data.size == 0
    @image_data = file_data
  end

  def file_is_image?
    @image_types.include?(@image_data.content_type)
  end

  def write_image
    if @image_data && file_is_image?
      @slideshow_path = File.join(@slideshows_path, "slideshow_#{id}", "#{id}_original.#{@file_data}.#{extension}")
      File.makedirs(@slideshow_path) unless File.exist?(@slideshow_path)
      File.open(@slideshow_path, 'w') { |f| f.write(@image_data.read) }
    end
  end

  def destroy_images
    FileUtils.rm_rf("#{@slideshows_path}/slideshow_#{id}")
  end

  def extension
    @file_data.original_filename.split('.').last
  end



  module ImageProcessor
    @@image_versions = {:thumb => 'c100x100', :default => '500x500'}
    mattr_reader :image_versions

    def process!
      @image_versions.each do |iv|

      end
    end

    def resize(version, height, width, constrain)

    end
  end
end