module BoffinIO

# File lib/boffinio.rb, line 188
def self.api_error(error, rcode, rbody, error_obj)
  APIError.new(error[:message], rcode, rbody, error_obj)
end

# File lib/boffinio.rb, line 39
def self.api_url(url='')
  @api_base+url
end

# File lib/boffinio.rb, line 184
def self.authentication_error(error, rcode, rbody, error_obj)
  AuthenticationError.new(error[:message], rcode, rbody, error_obj)
end

# File lib/boffinio.rb, line 142
def self.execute_request(opts)
  RestClient::Request.execute(opts)
end

# File lib/boffinio.rb, line 192
def self.general_api_error(rcode, rbody)
  BoffinIOError.new("Invalid response object from API: #{rbody.inspect} " +
               "(HTTP response code was #{rcode})", rcode, rbody)
end

# File lib/boffinio.rb, line 114
def self.get_uname
  `uname -a 2>/dev/null`.strip if RUBY_PLATFORM =~ /linux|darwin/i
rescue Errno::ENOMEM => ex # couldn't create subprocess
  "uname lookup failed"
end

# File lib/boffinio.rb, line 158
def self.handle_api_error(rcode, rbody)
  begin
    error_obj = JSON.parse(rbody)
    error_obj = Util.symbolize_names(error_obj)
    error = error_obj[:error] or raise BoffinIOError.new # escape from parsing

  rescue JSON::ParserError, BoffinIOError
    raise general_api_error(rcode, rbody)
  end

  case rcode
  when 400, 404
    raise invalid_request_error error, rcode, rbody, error_obj
  when 401
    raise authentication_error error, rcode, rbody, error_obj
  else
    raise api_error error, rcode, rbody, error_obj
  end

end

# File lib/boffinio.rb, line 197
def self.handle_restclient_error(e)
  connection_message = "Please check your internet connection and try again. " \
      "If this problem persists, you should check Boffin's service status at " \
      "https://twitter.com/boffinio, or let us know at support@boffin.io."

  case e
  when RestClient::RequestTimeout
    message = "Could not connect to Boffin (#{@api_base}). #{connection_message}"

  when RestClient::ServerBrokeConnection
    message = "The connection to the server (#{@api_base}) broke before the " \
      "request completed. #{connection_message}"

  when RestClient::SSLCertificateNotVerified
    message = "Could not verify Boffin's SSL certificate. " \
      "Please make sure that your network is not intercepting certificates. " \
      "(Try going to https://api.boffin.com/v1 in your browser.) " \
      "If this problem persists, let us know at support@boffin.io."

  when SocketError
    message = "Unexpected error communicating when trying to connect to Boffin. " \
      "You may be seeing this message because your DNS is not working. " \
      "To check, try running 'host boffin.io' from the command line."

  else
    message = "Unexpected error communicating with Boffin. " \
      "If this problem persists, let us know at support@boffin.io."

  end

  raise BoffinIOError.new(message + "\n\n(Network error: #{e.message})")
end

# File lib/boffinio.rb, line 179
def self.invalid_request_error(error, rcode, rbody, error_obj)
  InvalidRequestError.new(error[:message], error[:param], rcode,
                          rbody, error_obj)
end

# File lib/boffinio.rb, line 146
def self.parse(response)
  begin
    # Would use :symbolize_names => true, but apparently there is
    # some library out there that makes symbolize_names not work.
    response = JSON.parse(response.body)
  rescue JSON::ParserError
    raise general_api_error(response.code, response.body)
  end

  Util.symbolize_names(response)
end

# File lib/boffinio.rb, line 43
def self.request(method, url, api_key, params={}, headers={})
  unless api_key ||= @api_key
    raise AuthenticationError.new('No API key provided. ' +
      'Set your API key using "BoffinIO.api_key = <API-KEY>". ' +
      'You can generate API keys from the Boffin web interface. ')
  end

  if api_key =~ /\s/
    raise AuthenticationError.new('Your API key is invalid, as it contains ' +
      'whitespace. (HINT: You can double-check your API key from the ' +
      'Boffin web interface. See https://boffion.io/api for details, or ' +
      'email support@boffin.io if you have any questions.)')
  end

  request_opts = { :verify_ssl => false, :ssl_version => 'TLSv1' }

  params = Util.objects_to_ids(params)
  url = api_url(url)

  case method.to_s.downcase.to_sym
  when :get, :head, :delete
    # Make params into GET parameters
    url += "#{URI.parse(url).query ? '&' : '?'}#{uri_encode(params)}" if params && params.any?
    payload = nil
  else
    payload = uri_encode(params)
  end
  request_opts.update(:headers => request_headers(api_key).update(headers),
                      :method => method, :open_timeout => 30,
                      :payload => payload, :url => url, :timeout => 80)

  begin
    response = execute_request(request_opts)
  rescue SocketError => e
    handle_restclient_error(e)
  rescue NoMethodError => e
    # Work around RestClient bug
    if e.message =~ /\WRequestFailed\W/
      e = APIConnectionError.new('Unexpected HTTP response code')
      handle_restclient_error(e)
    else
      raise
    end
  rescue RestClient::ExceptionWithResponse => e
    if rcode = e.http_code and rbody = e.http_body
      handle_api_error(rcode, rbody)
    else
      handle_restclient_error(e)
    end
  rescue RestClient::Exception, Errno::ECONNREFUSED => e
    handle_restclient_error(e)
  end

  [parse(response), api_key]
end

# File lib/boffinio.rb, line 120
def self.request_headers(api_key)
  headers = {
    :user_agent => "Boffin/v1 RubyBindings/#{BoffinIO::VERSION}",
    :authorization => "Token token=#{api_key}",
    :content_type => 'application/x-www-form-urlencoded'
  }

  headers[:boffinio_version] = api_version if api_version

  begin
    headers.update(:x_boffinio_client_user_agent => JSON.generate(user_agent))
  rescue => e
    headers.update(:x_boffinio_client_raw_user_agent => user_agent.inspect,
                   :error => "#{e} (#{e.class})")
  end
end

# File lib/boffinio.rb, line 137
def self.uri_encode(params)
   Util.flatten_params(params).
     map { |k,v| "#{k}=#{Util.url_encode(v)}" }.join('&')
 end

# File lib/boffinio.rb, line 99
  def self.user_agent
  @uname ||= get_uname
  lang_version = "#{RUBY_VERSION} p#{RUBY_PATCHLEVEL} (#{RUBY_RELEASE_DATE})"

  {
    :bindings_version => BoffinIO::VERSION,
    :lang => 'ruby',
    :lang_version => lang_version,
    :platform => RUBY_PLATFORM,
    :publisher => 'boffinio',
    :uname => @uname
  }

end