class Jets::TmpLoader

def self.load!
  new.load
end

def download(key, dest)
  # https://docs.aws.amazon.com/sdk-for-ruby/v3/api/Aws/S3/Client.html#get_object-instance_method
  # stream object directly to disk
  s3.get_object(response_target: dest,
                bucket: @s3_bucket,
                key: key)
end

def download_and_extract(zip_file, folder_dest)
  s3_key = "jets/code/#{zip_file}" # jets/code/rack-checksum.zip
  download_path = "/tmp/#{zip_file}" # /tmp/rack-checksum.zip
  download(s3_key, download_path)
  unzip(download_path, folder_dest)
end

def initialize(yaml_path=nil)
  yaml_path ||= "#{Jets.root}/handlers/data.yml"
  @data = YAML.load_file(yaml_path) if File.exist?(yaml_path)
  @s3_bucket = @data['s3_bucket']
  @rack_zip = @data['rack_zip']
end

def load
  rack
end

def rack
  return unless @rack_zip
  download_and_extract(@rack_zip, '/tmp/rack')
end

def sh(command)
  puts "=> #{command}"
  success = system(command)
  raise "Command #{command} failed" unless success
  success
end

def unzip(zipfile, folder_dest)
  sh "unzip -qo #{zipfile} -d #{folder_dest}"
end