#pragma once

#include <chrono>

#include "envoy/stats/scope.h"

namespace Envoy {

namespace Http {

/**

 * HTTP response codes.

 * http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml

 */

enum class Code : uint16_t {

  // clang-format off

  Continue                      = 100,

  SwitchingProtocols            = 101,

  OK                            = 200,

  Created                       = 201,

  Accepted                      = 202,

  NonAuthoritativeInformation   = 203,

  NoContent                     = 204,

  ResetContent                  = 205,

  PartialContent                = 206,

  MultiStatus                   = 207,

  AlreadyReported               = 208,

  IMUsed                        = 226,

  MultipleChoices               = 300,

  MovedPermanently              = 301,

  Found                         = 302,

  SeeOther                      = 303,

  NotModified                   = 304,

  UseProxy                      = 305,

  TemporaryRedirect             = 307,

  PermanentRedirect             = 308,

  BadRequest                    = 400,

  Unauthorized                  = 401,

  PaymentRequired               = 402,

  Forbidden                     = 403,

  NotFound                      = 404,

  MethodNotAllowed              = 405,

  NotAcceptable                 = 406,

  ProxyAuthenticationRequired   = 407,

  RequestTimeout                = 408,

  Conflict                      = 409,

  Gone                          = 410,

  LengthRequired                = 411,

  PreconditionFailed            = 412,

  PayloadTooLarge               = 413,

  URITooLong                    = 414,

  UnsupportedMediaType          = 415,

  RangeNotSatisfiable           = 416,

  ExpectationFailed             = 417,

  MisdirectedRequest            = 421,

  UnprocessableEntity           = 422,

  Locked                        = 423,

  FailedDependency              = 424,

  TooEarly                      = 425,

  UpgradeRequired               = 426,

  PreconditionRequired          = 428,

  TooManyRequests               = 429,

  RequestHeaderFieldsTooLarge   = 431,

  InternalServerError           = 500,

  NotImplemented                = 501,

  BadGateway                    = 502,

  ServiceUnavailable            = 503,

  GatewayTimeout                = 504,

  HTTPVersionNotSupported       = 505,

  VariantAlsoNegotiates         = 506,

  InsufficientStorage           = 507,

  LoopDetected                  = 508,

  NotExtended                   = 510,

  NetworkAuthenticationRequired = 511,

  // 512-599 are unassigned server error codes.

  LastUnassignedServerErrorCode = 599

  // clang-format on

};

/**

 * Manages updating of statistics for HTTP Status Codes. Sets up string-tokens

 * for fast combining of tokens based on scope, status-code buckets (2xx,

 * 4xx...), and exact status code.

 */

class CodeStats {

public:

  struct ResponseStatInfo;

  struct ResponseTimingInfo;

  /**

   * Charge a simple response stat to an upstream. exclude_http_code_stats will skip charging

   * HTTP group/individual status code stats if set to True.

   */

  virtual void chargeBasicResponseStat(Stats::Scope& scope, Stats::StatName prefix,

                                       Code response_code, bool exclude_http_code_stats) const PURE;

  /**

   * Charge a response stat to both agg counters (*xx) as well as code specific counters. This

   * routine also looks for the x-envoy-upstream-canary header and if it is set, also charges

   * canary stats. exclude_http_code_stats will skip charging HTTP group/individual status

   * code stats if set to True.

   */

  virtual void chargeResponseStat(const ResponseStatInfo& info,

                                  bool exclude_http_code_stats) const PURE;

  /**

   * Charge a response timing to the various dynamic stat postfixes.

   */

  virtual void chargeResponseTiming(const ResponseTimingInfo& info) const PURE;

};

} // namespace Http

} // namespace Envoy