#!/usr/bin/ruby
#
# Copyright (c) 2007 Daniel Rodríguez Troitiño
# 
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
# 
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
# 
# Use:
# 1. Search for the "RSS" link in the Picasa Web Album you want. You can find
#    it at the bottom of the album picture index.
# 2. Move to the directory you want your photos to be downloaded.
# 3. Use the RSS link URL from the first step as the second argument for
#    baja-fotos.rb.
# 4. Enjoy.

require 'open-uri'
require 'rss'
require 'open-uri'
require 'pathname'
require 'fileutils'

if ARGV.length == 0
  puts "Use: baja-fotos.rb [RSS URL]"
  exit 0
end

rss_url = ARGV[0]

puts "Downloading photos from <#{rss_url}>"

rss_file = open(rss_url)
rss = RSS::Parser.parse(rss_file)

num_items = rss.items.length
puts "Total photos: #{num_items}"

rss.items.each_with_index do |item, index|
  enclosure_url = URI.parse(item.enclosure.url)
  file_path = Pathname.new(enclosure_url.path)
  local_file_name = URI.unescape(file_path.basename.to_s)
  
  puts "Photo #{index+1} of #{num_items} -> #{local_file_name}"
  
  enclosure = open(enclosure_url.to_s)
  FileUtils.copy(enclosure.path, local_file_name)
  enclosure.close
end