class Aws::Plugins::UserAgent::Handler::UserAgent

def api_metadata
  service_id = @context.config.api.metadata['serviceId']
  return unless service_id
  service_id = service_id.gsub(' ', '_').downcase
  gem_version = @context[:gem_version]
  "api/#{service_id}##{gem_version}"
end

def app_id
  return unless (app_id = @context.config.sdk_ua_app_id)
  # Sanitize and only allow these characters
  app_id = app_id.gsub(/[^!#$%&'*+\-.^_`|~0-9A-Za-z]/, '-')
  "app/#{app_id}"
end

def config_metadata
  "cfg/retry-mode##{@context.config.retry_mode}"
end

def env_metadata
  return unless (execution_env = ENV['AWS_EXECUTION_ENV'])
  "exec-env/#{execution_env}"
end

def feature_metadata
  return unless Thread.current[:aws_sdk_core_user_agent_feature]
  Thread.current[:aws_sdk_core_user_agent_feature].join(' ')
end

def framework_metadata
  if (frameworks_cfg = @context.config.user_agent_frameworks).empty?
    return
  end
  # Frameworks may be aws-record, aws-sdk-rails, etc.
  regex = /gems\/(?<name>#{frameworks_cfg.join('|')})-(?<version>\d+\.\d+\.\d+)/.freeze
  frameworks = {}
  Kernel.caller.each do |line|
    match = line.match(regex)
    next unless match
    frameworks[match[:name]] = match[:version]
  end
  frameworks.map { |n, v| "lib/#{n}##{v}" }.join(' ')
end

def initialize(context)
  @context = context
end

def language_metadata
  "lang/#{RUBY_ENGINE}##{RUBY_ENGINE_VERSION} md/#{RUBY_VERSION}"
end

def os_metadata
  os =
    case RbConfig::CONFIG['host_os']
    when /mac|darwin/
      'macos'
    when /linux|cygwin/
      'linux'
    when /mingw|mswin/
      'windows'
    else
      'other'
    end
  metadata = "os/#{os}"
  local_version = Gem::Platform.local.version
  metadata += "##{local_version}" if local_version
  metadata += " md/#{RbConfig::CONFIG['host_cpu']}"
  metadata
end

def to_s
  ua = "aws-sdk-ruby3/#{CORE_GEM_VERSION}"
  ua += ' ua/2.0'
  ua += " #{api_metadata}" if api_metadata
  ua += " #{os_metadata}"
  ua += " #{language_metadata}"
  ua += " #{env_metadata}" if env_metadata
  ua += " #{config_metadata}" if config_metadata
  ua += " #{app_id}" if app_id
  ua += " #{feature_metadata}" if feature_metadata
  ua += " #{framework_metadata}" if framework_metadata
  if @context.config.user_agent_suffix
    ua += " #{@context.config.user_agent_suffix}"
  end
  ua.strip
end