module AWS

def api_versions
  @versions ||= begin
    # get a list of support services/apis from disk
    versions = {}
    pattern = File.join(File.dirname(__FILE__), 'api_config', '*.yml')
    Dir.glob(pattern).each do |path|
      matches = path.match(/(\w+)-(\d{4}-\d{2}-\d{2})/)
      svc = SERVICES[$1].full_name
      versions[svc] ||= []
      versions[svc] << $2
    end
    # s3 does not have an API configuration, so we have to add it manually
    versions[SERVICES['S3'].full_name] = ['2006-03-01']
    # sort the services alphabetically
    versions.keys.sort_by(&:downcase).inject({}) do |hash,svc|
      hash[svc] = versions[svc]
      hash
    end
  end
end

def config options = {}
  @@config ||= Core::Configuration.new
  @@config = @@config.with(options) unless options.empty?
  @@config
end

def eager_autoload! klass_or_module = AWS, visited = Set.new
  klass_or_module.constants.each do |const_name|
    path = klass_or_module.autoload?(const_name)
    require(path) if path
    const = klass_or_module.const_get(const_name)
    if const.is_a?(Module)
      unless visited.include?(const)
        visited << const
        eager_autoload!(const, visited)
      end
    end
  end
end

def memoize
  return yield if memoizing?
  begin
    start_memoizing
    yield if block_given?
  ensure
    stop_memoizing
  end
end

def memoizing?
  !Thread.current[:aws_memoization].nil?
end

def patch_net_http_100_continue!
  require 'aws/core/http/patch'
  AWS::Core::Http.patch_net_http_100_continue!
  nil
end

def regions
  Core::RegionCollection.new
end

def reset_memoization
  Thread.current[:aws_memoization] = {}
end

def resource_cache
  if memoizing?
    Thread.current[:aws_memoization][:resource_cache] ||=
      Core::ResourceCache.new
  end
end

def response_cache
  if memoizing?
    Thread.current[:aws_memoization][:response_cache] ||=
      Core::ResponseCache.new
  end
end

def start_memoizing
  Thread.current[:aws_memoization] ||= {}
  nil
end

def stop_memoizing
  Thread.current[:aws_memoization] = nil
end

def stub!
  config(:stub_requests => true)
  nil
end