class Aws::Json::Handler

def apply_request_id(context)
  context[:request_id] = context.http_response.headers['x-amzn-requestid']
end

def build_body(context)
  if simple_json?(context)
    Json.dump(context.params)
  else
    Builder.new(context.operation.input).serialize(context.params)
  end
end

def build_request(context)
  context.http_request.http_method = 'POST'
  context.http_request.headers['Content-Type'] = content_type(context)
  context.http_request.headers['X-Amz-Target'] = target(context)
  context.http_request.body = build_body(context)
end

def call(context)
  build_request(context)
  response = @handler.call(context)
  response.on(200..299) { |resp| parse_response(resp) }
  response.on(200..599) { |resp| apply_request_id(context) }
  response
end

def content_type(context)
  CONTENT_TYPE % [context.config.api.metadata['jsonVersion']]
end

def parse_body(context)
  if simple_json?(context)
    Json.load(context.http_response.body_contents)
  elsif rules = context.operation.output
    json = context.http_response.body_contents
    if json.is_a?(Array)
      # an array of emitted events
      if json[0].respond_to?(:response)
        # initial response exists
        # it must be the first event arrived
        resp_struct = json.shift.response
      else
        resp_struct = context.operation.output.shape.struct_class.new
      end
      rules.shape.members.each do |name, ref|
        if ref.eventstream
          resp_struct.send("#{name}=", json.to_enum)
        end
      end
      resp_struct
    else
      Parser.new(
        rules,
        query_compatible: query_compatible?(context)
      ).parse(json == '' ? '{}' : json)
    end
  else
    EmptyStructure.new
  end
end

def parse_response(response)
  response.data = parse_body(response.context)
end

def query_compatible?(context)
  context.config.api.metadata.key?('awsQueryCompatible')
end

def simple_json?(context)
  context.config.simple_json
end

def target(context)
  prefix = context.config.api.metadata['targetPrefix']
  "#{prefix}.#{context.operation.name}"
end