// Package irc provides constants and utilities for the
// IRC protocol, including numeric reply codes from
// RFC 1459 and RFC 2812, and standard command names.
package irc

// Connection registration replies (001-005).
const (
	RplWelcome  = 1
	RplYourHost = 2
	RplCreated  = 3
	RplMyInfo   = 4
	RplBounce   = 5 // RFC 2812; also known as RPL_ISUPPORT in practice
	RplIsupport = 5 // De-facto standard (same numeric as RplBounce)
)

// Command responses (200-399).
const (
	// RFC 2812 trace/stats/links replies (200-219).
	RplTraceLink       = 200
	RplTraceConnecting = 201
	RplTraceHandshake  = 202
	RplTraceUnknown    = 203
	RplTraceOperator   = 204
	RplTraceUser       = 205
	RplTraceServer     = 206
	RplTraceService    = 207
	RplTraceNewType    = 208
	RplTraceClass      = 209
	RplStatsLinkInfo   = 211
	RplStatsCommands   = 212
	RplStatsCLine      = 213
	RplStatsNLine      = 214
	RplStatsILine      = 215
	RplStatsKLine      = 216
	RplStatsYLine      = 218
	RplEndOfStats      = 219

	RplUmodeIs      = 221
	RplServList     = 234
	RplServListEnd  = 235
	RplStatsUptime  = 242
	RplStatsOLine   = 243
	RplLuserClient  = 251
	RplLuserOp      = 252
	RplLuserUnknown = 253

	RplLuserChannels = 254
	RplLuserMe       = 255
	RplAdminMe       = 256
	RplAdminLoc1     = 257
	RplAdminLoc2     = 258
	RplAdminEmail    = 259
	RplTraceLog      = 261
	RplTraceEnd      = 262
	RplTryAgain      = 263

	RplAway          = 301
	RplUserHost      = 302
	RplIson          = 303
	RplUnaway        = 305
	RplNowAway       = 306
	RplWhoisUser     = 311
	RplWhoisServer   = 312
	RplWhoisOperator = 313
	RplWhoWasUser    = 314
	RplEndOfWho      = 315
	RplWhoisIdle     = 317
	RplEndOfWhois    = 318
	RplWhoisChannels = 319
	RplListStart     = 321
	RplList          = 322
	RplListEnd       = 323
	RplChannelModeIs = 324

	RplUniqOpIs        = 325
	RplCreationTime    = 329
	RplNoTopic         = 331
	RplTopic           = 332
	RplTopicWhoTime    = 333
	RplInviting        = 341
	RplSummoning       = 342
	RplInviteList      = 346
	RplEndOfInviteList = 347
	RplExceptList      = 348
	RplEndOfExceptList = 349
	RplVersion         = 351
	RplWhoReply        = 352
	RplNamReply        = 353
	RplLinks           = 364
	RplEndOfLinks      = 365
	RplEndOfNames      = 366
	RplBanList         = 367
	RplEndOfBanList    = 368
	RplEndOfWhowas     = 369
	RplInfo            = 371
	RplMotd            = 372
	RplEndOfInfo       = 374
	RplMotdStart       = 375
	RplEndOfMotd       = 376
	RplYoureOper       = 381
	RplRehashing       = 382
	RplYoureService    = 383
	RplTime            = 391
	RplUsersStart      = 392
	RplUsers           = 393
	RplEndOfUsers      = 394
	RplNoUsers         = 395
)

// Error replies (400-599).
const (
	ErrNoSuchNick       = 401
	ErrNoSuchServer     = 402
	ErrNoSuchChannel    = 403
	ErrCannotSendToChan = 404
	ErrTooManyChannels  = 405
	ErrWasNoSuchNick    = 406
	ErrTooManyTargets   = 407
	ErrNoSuchService    = 408
	ErrNoOrigin         = 409
	ErrNoRecipient      = 411
	ErrNoTextToSend     = 412
	ErrNoTopLevel       = 413
	ErrWildTopLevel     = 414
	ErrBadMask          = 415
	ErrUnknownCommand   = 421
	ErrNoMotd           = 422
	ErrNoAdminInfo      = 423
	ErrFileError        = 424
	ErrNoNicknameGiven  = 431
	ErrErroneusNickname = 432
	ErrNicknameInUse    = 433
	ErrNickCollision    = 436
	ErrUnavailResource  = 437

	ErrUserNotInChannel  = 441
	ErrNotOnChannel      = 442
	ErrUserOnChannel     = 443
	ErrNoLogin           = 444
	ErrSummonDisabled    = 445
	ErrUsersDisabled     = 446
	ErrNotRegistered     = 451
	ErrNeedMoreParams    = 461
	ErrAlreadyRegistered = 462
	ErrNoPermForHost     = 463
	ErrPasswdMismatch    = 464
	ErrYoureBannedCreep  = 465
	ErrYouWillBeBanned   = 466
	ErrKeySet            = 467
	ErrChannelIsFull     = 471
	ErrUnknownMode       = 472
	ErrInviteOnlyChan    = 473
	ErrBannedFromChan    = 474
	ErrBadChannelKey     = 475
	ErrBadChanMask       = 476
	ErrNoChanModes       = 477
	ErrBanListFull       = 478
	ErrNoPrivileges      = 481
	ErrChanOpPrivsNeeded = 482
	ErrCantKillServer    = 483
	ErrRestricted        = 484
	ErrUniqOpPrivsNeeded = 485
	ErrNoOperHost        = 491

	ErrUmodeUnknownFlag = 501
	ErrUsersDoNotMatch  = 502
)

// names maps numeric codes to their standard IRC names.
//
//nolint:gochecknoglobals
var names = map[int]string{
	RplWelcome:  "RPL_WELCOME",
	RplYourHost: "RPL_YOURHOST",
	RplCreated:  "RPL_CREATED",
	RplMyInfo:   "RPL_MYINFO",
	RplBounce:   "RPL_BOUNCE",

	RplTraceLink:       "RPL_TRACELINK",
	RplTraceConnecting: "RPL_TRACECONNECTING",
	RplTraceHandshake:  "RPL_TRACEHANDSHAKE",
	RplTraceUnknown:    "RPL_TRACEUNKNOWN",
	RplTraceOperator:   "RPL_TRACEOPERATOR",
	RplTraceUser:       "RPL_TRACEUSER",
	RplTraceServer:     "RPL_TRACESERVER",
	RplTraceService:    "RPL_TRACESERVICE",
	RplTraceNewType:    "RPL_TRACENEWTYPE",
	RplTraceClass:      "RPL_TRACECLASS",
	RplStatsLinkInfo:   "RPL_STATSLINKINFO",
	RplStatsCommands:   "RPL_STATSCOMMANDS",
	RplStatsCLine:      "RPL_STATSCLINE",
	RplStatsNLine:      "RPL_STATSNLINE",
	RplStatsILine:      "RPL_STATSILINE",
	RplStatsKLine:      "RPL_STATSKLINE",
	RplStatsYLine:      "RPL_STATSYLINE",
	RplEndOfStats:      "RPL_ENDOFSTATS",

	RplUmodeIs:      "RPL_UMODEIS",
	RplServList:     "RPL_SERVLIST",
	RplServListEnd:  "RPL_SERVLISTEND",
	RplStatsUptime:  "RPL_STATSUPTIME",
	RplStatsOLine:   "RPL_STATSOLINE",
	RplLuserClient:  "RPL_LUSERCLIENT",
	RplLuserOp:      "RPL_LUSEROP",
	RplLuserUnknown: "RPL_LUSERUNKNOWN",

	RplLuserChannels: "RPL_LUSERCHANNELS",
	RplLuserMe:       "RPL_LUSERME",
	RplAdminMe:       "RPL_ADMINME",
	RplAdminLoc1:     "RPL_ADMINLOC1",
	RplAdminLoc2:     "RPL_ADMINLOC2",
	RplAdminEmail:    "RPL_ADMINEMAIL",
	RplTraceLog:      "RPL_TRACELOG",
	RplTraceEnd:      "RPL_TRACEEND",
	RplTryAgain:      "RPL_TRYAGAIN",

	RplAway:          "RPL_AWAY",
	RplUserHost:      "RPL_USERHOST",
	RplIson:          "RPL_ISON",
	RplUnaway:        "RPL_UNAWAY",
	RplNowAway:       "RPL_NOWAWAY",
	RplWhoisUser:     "RPL_WHOISUSER",
	RplWhoisServer:   "RPL_WHOISSERVER",
	RplWhoisOperator: "RPL_WHOISOPERATOR",
	RplWhoWasUser:    "RPL_WHOWASUSER",
	RplEndOfWho:      "RPL_ENDOFWHO",
	RplWhoisIdle:     "RPL_WHOISIDLE",
	RplEndOfWhois:    "RPL_ENDOFWHOIS",
	RplWhoisChannels: "RPL_WHOISCHANNELS",
	RplListStart:     "RPL_LISTSTART",
	RplList:          "RPL_LIST",
	RplListEnd:       "RPL_LISTEND", //nolint:misspell
	RplChannelModeIs: "RPL_CHANNELMODEIS",

	RplUniqOpIs:        "RPL_UNIQOPIS",
	RplCreationTime:    "RPL_CREATIONTIME",
	RplNoTopic:         "RPL_NOTOPIC",
	RplTopic:           "RPL_TOPIC",
	RplTopicWhoTime:    "RPL_TOPICWHOTIME",
	RplInviting:        "RPL_INVITING",
	RplSummoning:       "RPL_SUMMONING",
	RplInviteList:      "RPL_INVITELIST",
	RplEndOfInviteList: "RPL_ENDOFINVITELIST",
	RplExceptList:      "RPL_EXCEPTLIST",
	RplEndOfExceptList: "RPL_ENDOFEXCEPTLIST",
	RplVersion:         "RPL_VERSION",
	RplWhoReply:        "RPL_WHOREPLY",
	RplNamReply:        "RPL_NAMREPLY",
	RplLinks:           "RPL_LINKS",
	RplEndOfLinks:      "RPL_ENDOFLINKS",
	RplEndOfNames:      "RPL_ENDOFNAMES",
	RplBanList:         "RPL_BANLIST",
	RplEndOfBanList:    "RPL_ENDOFBANLIST",
	RplEndOfWhowas:     "RPL_ENDOFWHOWAS",
	RplInfo:            "RPL_INFO",
	RplMotd:            "RPL_MOTD",
	RplEndOfInfo:       "RPL_ENDOFINFO",
	RplMotdStart:       "RPL_MOTDSTART",
	RplEndOfMotd:       "RPL_ENDOFMOTD",
	RplYoureOper:       "RPL_YOUREOPER",
	RplRehashing:       "RPL_REHASHING",
	RplYoureService:    "RPL_YOURESERVICE",
	RplTime:            "RPL_TIME",
	RplUsersStart:      "RPL_USERSSTART",
	RplUsers:           "RPL_USERS",
	RplEndOfUsers:      "RPL_ENDOFUSERS",
	RplNoUsers:         "RPL_NOUSERS",

	ErrNoSuchNick:       "ERR_NOSUCHNICK",
	ErrNoSuchServer:     "ERR_NOSUCHSERVER",
	ErrNoSuchChannel:    "ERR_NOSUCHCHANNEL",
	ErrCannotSendToChan: "ERR_CANNOTSENDTOCHAN",
	ErrTooManyChannels:  "ERR_TOOMANYCHANNELS",
	ErrWasNoSuchNick:    "ERR_WASNOSUCHNICK",
	ErrTooManyTargets:   "ERR_TOOMANYTARGETS",
	ErrNoSuchService:    "ERR_NOSUCHSERVICE",
	ErrNoOrigin:         "ERR_NOORIGIN",
	ErrNoRecipient:      "ERR_NORECIPIENT",
	ErrNoTextToSend:     "ERR_NOTEXTTOSEND",
	ErrNoTopLevel:       "ERR_NOTOPLEVEL",
	ErrWildTopLevel:     "ERR_WILDTOPLEVEL",
	ErrBadMask:          "ERR_BADMASK",
	ErrUnknownCommand:   "ERR_UNKNOWNCOMMAND",
	ErrNoMotd:           "ERR_NOMOTD",
	ErrNoAdminInfo:      "ERR_NOADMININFO",
	ErrFileError:        "ERR_FILEERROR",
	ErrNoNicknameGiven:  "ERR_NONICKNAMEGIVEN",
	ErrErroneusNickname: "ERR_ERRONEUSNICKNAME",
	ErrNicknameInUse:    "ERR_NICKNAMEINUSE",
	ErrNickCollision:    "ERR_NICKCOLLISION",
	ErrUnavailResource:  "ERR_UNAVAILRESOURCE",

	ErrUserNotInChannel:  "ERR_USERNOTINCHANNEL",
	ErrNotOnChannel:      "ERR_NOTONCHANNEL",
	ErrUserOnChannel:     "ERR_USERONCHANNEL",
	ErrNoLogin:           "ERR_NOLOGIN",
	ErrSummonDisabled:    "ERR_SUMMONDISABLED",
	ErrUsersDisabled:     "ERR_USERSDISABLED",
	ErrNotRegistered:     "ERR_NOTREGISTERED",
	ErrNeedMoreParams:    "ERR_NEEDMOREPARAMS",
	ErrAlreadyRegistered: "ERR_ALREADYREGISTERED",
	ErrNoPermForHost:     "ERR_NOPERMFORHOST",
	ErrPasswdMismatch:    "ERR_PASSWDMISMATCH",
	ErrYoureBannedCreep:  "ERR_YOUREBANNEDCREEP",
	ErrYouWillBeBanned:   "ERR_YOUWILLBEBANNED",
	ErrKeySet:            "ERR_KEYSET",
	ErrChannelIsFull:     "ERR_CHANNELISFULL",
	ErrUnknownMode:       "ERR_UNKNOWNMODE",
	ErrInviteOnlyChan:    "ERR_INVITEONLYCHAN",
	ErrBannedFromChan:    "ERR_BANNEDFROMCHAN",
	ErrBadChannelKey:     "ERR_BADCHANNELKEY",
	ErrBadChanMask:       "ERR_BADCHANMASK",
	ErrNoChanModes:       "ERR_NOCHANMODES",
	ErrBanListFull:       "ERR_BANLISTFULL",
	ErrNoPrivileges:      "ERR_NOPRIVILEGES",
	ErrChanOpPrivsNeeded: "ERR_CHANOPRIVSNEEDED",
	ErrCantKillServer:    "ERR_CANTKILLSERVER",
	ErrRestricted:        "ERR_RESTRICTED",
	ErrUniqOpPrivsNeeded: "ERR_UNIQOPPRIVSNEEDED",
	ErrNoOperHost:        "ERR_NOOPERHOST",

	ErrUmodeUnknownFlag: "ERR_UMODEUNKNOWNFLAG",
	ErrUsersDoNotMatch:  "ERR_USERSDONTMATCH",
}

// Name returns the standard IRC name for a numeric code
// (e.g., Name(2) returns "RPL_YOURHOST"). Returns an
// empty string if the code is unknown.
func Name(code int) string {
	return names[code]
}