require 'exifr'
require 'fileutils'

module Photoarchiver

  def self.organize(dir_src, dir_target)

    if File.exists?(dir_src) && File.directory?(dir_src)
      Dir.mkdir(dir_target) unless File.exists?(dir_target)
    else
      raise 'First argument, source directory, does not exist or is not a directory'
    end

    puts dir_src
    puts dir_target

    photos = Dir.glob(File.join(dir_src, '**', '*')).reject { |temp| File.directory? temp }

    photos.each_with_index {|val, index|
      exif_data = EXIFR::JPEG.new(val).date_time_original
      FileUtils::mkdir_p File.join(dir_target, exif_data.strftime('%Y%m%d'))
      target_file = File.join(dir_target, exif_data.strftime('%Y%m%d'), exif_data.strftime('%Y%m%d-%H%M%S')) + '.jpg'
      puts "Moving #{val} to #{target_file}"
      File.rename(val, target_file)
    }
    puts 'Done processing photos'
  end
end