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desc "cache assets"
task :cache_assets => :environment do
  BUCKET = 'my-bucket-name'
  PATHS = ['public/javascripts/all.js']

  s3_yml = "#{Rails.root}/config/s3.yml"
  s3_config = YAML.load_file(s3_yml)

  puts "-----> caching assets..."
  PATHS.each do |path|
    FileUtils.rm(path) if File.exist?(path)
  end

  ActionController::Base.perform_caching = true

  session = ActionDispatch::Integration::Session.new(Rails.application)
  session.get('/')
  session.follow_redirect!

  AWS::S3::Base.establish_connection!(
    :access_key_id => s3_config['production']['access_key_id'],
    :secret_access_key => s3_config['production']['secret_access_key']
  )

  PATHS.each do |f|
    next if File.directory?(f)

    key = f.gsub(/\.\/public/, '')
    puts " -> %s" % key

    puts "   -> uglify..."
    ugly_file = Uglifier.new.compile(File.read(f))

    puts "   -> gzip..."
    gzip_file = StringIO.open('', 'w')
    gz = Zlib::GzipWriter.new(gzip_file)
    gz.write(ugly_file)
    gz.close

    puts "   -> upload to S3..."
    AWS::S3::S3Object.store(
      key, gzip_file.string, BUCKET,
      :access => :public_read, 'Cache-Control' => 'max-age=315360000', 'Content-Encoding' => 'gzip'
    )

    puts "   -> add config var"
    system("heroku config:add all_js_cache_id=#{ugly_file.hash.abs}")
  end

  puts "-----> done"
end