module MLClient

# File lib/ml_client.rb, line 33
def api_url
  configuration&.api_url
end

# File lib/ml_client.rb, line 28
def configure
  self.configuration ||= Configuration.new
  yield configuration
end

# File lib/ml_client.rb, line 16
def predict(model_name, instances, url: api_url, endpoint: nil)
  endpoint ||= 'predict'
  query_strings = { model: model_name }
  post(url, endpoint, query_strings, formatted_instances(instances))
end

# File lib/ml_client.rb, line 22
def predict_async(model_name, instances, url: api_url, endpoint: nil, webhook_url: nil)
  endpoint ||= 'predict_async'
  query_strings = { model: model_name, webhook_url: webhook_url }
  post(url, endpoint, query_strings, formatted_instances(instances))
end

# File lib/ml_client.rb, line 79
def formatted_instances(params)
  { instances: params }
end

# File lib/ml_client.rb, line 39
def post(url, endpoint, query_strings, payload)
  raise ConfigurationError, 'Missing url' if url.nil?

  uri = URI.join(url, endpoint || '')
  uri.query = URI.encode_www_form(query_strings)

  req = Net::HTTP::Post.new(uri)
  req['Authorization'] = "Bearer #{configuration.api_bearer}" if configuration&.api_bearer
  req['Content-Type'] = 'application/json'

  req.body = payload.to_json
  generate_https = Net::HTTP.new(uri.host, uri.port)
  generate_https.use_ssl = true if uri.scheme == 'https'
  generate_https.set_debug_output($stdout) if configuration&.debug

  res = generate_https.request(req)
  response = JSON.parse(res.body)

  case res.code
  when '400'
    raise FailedValidationError, "Wrong inputs #{params} in model #{model_name}"
  when '403'
    raise AuthentificationError, 'Authorization error'
  when '404'
    raise WrongModelName, "Wrong model name #{model_name}"
  when '405'
    raise AsyncError, "#{model_name} should be called in an asynchronous manner"
  when '500'
    raise InternalServerError, 'Internal server error in api'
  when '200'
    # it's sync
    response
  when '202'
    # it's async
    true
  else
    raise UnhandledError, 'Cannot process error code'
  end
end