// 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
	RplIsupport = 5
)

// Command responses (200-399).
const (
	RplUmodeIs       = 221
	RplLuserClient   = 251
	RplLuserOp       = 252
	RplLuserUnknown  = 253
	RplLuserChannels = 254
	RplLuserMe       = 255
	RplAway          = 301
	RplUserHost      = 302
	RplIson          = 303
	RplUnaway        = 305
	RplNowAway       = 306
	RplWhoisUser     = 311
	RplWhoisServer   = 312
	RplWhoisOperator = 313
	RplEndOfWho      = 315
	RplWhoisIdle     = 317
	RplEndOfWhois    = 318
	RplWhoisChannels = 319
	RplList          = 322
	RplListEnd       = 323
	RplChannelModeIs = 324
	RplCreationTime  = 329
	RplNoTopic       = 331
	RplTopic         = 332
	RplTopicWhoTime  = 333
	RplInviting      = 341
	RplWhoReply      = 352
	RplNamReply      = 353
	RplEndOfNames    = 366
	RplBanList       = 367
	RplEndOfBanList  = 368
	RplMotd          = 372
	RplMotdStart     = 375
	RplEndOfMotd     = 376
)

// Error replies (400-599).
const (
	ErrNoSuchNick        = 401
	ErrNoSuchServer      = 402
	ErrNoSuchChannel     = 403
	ErrCannotSendToChan  = 404
	ErrTooManyChannels   = 405
	ErrNoRecipient       = 411
	ErrNoTextToSend      = 412
	ErrUnknownCommand    = 421
	ErrNoNicknameGiven   = 431
	ErrErroneusNickname  = 432
	ErrNicknameInUse     = 433
	ErrUserNotInChannel  = 441
	ErrNotOnChannel      = 442
	ErrNotRegistered     = 451
	ErrNeedMoreParams    = 461
	ErrAlreadyRegistered = 462
	ErrChannelIsFull     = 471
	ErrInviteOnlyChan    = 473
	ErrBannedFromChan    = 474
	ErrBadChannelKey     = 475
	ErrChanOpPrivsNeeded = 482
)

// 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",
	RplIsupport:      "RPL_ISUPPORT",
	RplUmodeIs:       "RPL_UMODEIS",
	RplLuserClient:   "RPL_LUSERCLIENT",
	RplLuserOp:       "RPL_LUSEROP",
	RplLuserUnknown:  "RPL_LUSERUNKNOWN",
	RplLuserChannels: "RPL_LUSERCHANNELS",
	RplLuserMe:       "RPL_LUSERME",
	RplAway:          "RPL_AWAY",
	RplUserHost:      "RPL_USERHOST",
	RplIson:          "RPL_ISON",
	RplUnaway:        "RPL_UNAWAY",
	RplNowAway:       "RPL_NOWAWAY",
	RplWhoisUser:     "RPL_WHOISUSER",
	RplWhoisServer:   "RPL_WHOISSERVER",
	RplWhoisOperator: "RPL_WHOISOPERATOR",
	RplEndOfWho:      "RPL_ENDOFWHO",
	RplWhoisIdle:     "RPL_WHOISIDLE",
	RplEndOfWhois:    "RPL_ENDOFWHOIS",
	RplWhoisChannels: "RPL_WHOISCHANNELS",
	RplList:          "RPL_LIST",
	RplListEnd:       "RPL_LISTEND", //nolint:misspell
	RplChannelModeIs: "RPL_CHANNELMODEIS",
	RplCreationTime:  "RPL_CREATIONTIME",
	RplNoTopic:       "RPL_NOTOPIC",
	RplTopic:         "RPL_TOPIC",
	RplTopicWhoTime:  "RPL_TOPICWHOTIME",
	RplInviting:      "RPL_INVITING",
	RplWhoReply:      "RPL_WHOREPLY",
	RplNamReply:      "RPL_NAMREPLY",
	RplEndOfNames:    "RPL_ENDOFNAMES",
	RplBanList:       "RPL_BANLIST",
	RplEndOfBanList:  "RPL_ENDOFBANLIST",
	RplMotd:          "RPL_MOTD",
	RplMotdStart:     "RPL_MOTDSTART",
	RplEndOfMotd:     "RPL_ENDOFMOTD",

	ErrNoSuchNick:        "ERR_NOSUCHNICK",
	ErrNoSuchServer:      "ERR_NOSUCHSERVER",
	ErrNoSuchChannel:     "ERR_NOSUCHCHANNEL",
	ErrCannotSendToChan:  "ERR_CANNOTSENDTOCHAN",
	ErrTooManyChannels:   "ERR_TOOMANYCHANNELS",
	ErrNoRecipient:       "ERR_NORECIPIENT",
	ErrNoTextToSend:      "ERR_NOTEXTTOSEND",
	ErrUnknownCommand:    "ERR_UNKNOWNCOMMAND",
	ErrNoNicknameGiven:   "ERR_NONICKNAMEGIVEN",
	ErrErroneusNickname:  "ERR_ERRONEUSNICKNAME",
	ErrNicknameInUse:     "ERR_NICKNAMEINUSE",
	ErrUserNotInChannel:  "ERR_USERNOTINCHANNEL",
	ErrNotOnChannel:      "ERR_NOTONCHANNEL",
	ErrNotRegistered:     "ERR_NOTREGISTERED",
	ErrNeedMoreParams:    "ERR_NEEDMOREPARAMS",
	ErrAlreadyRegistered: "ERR_ALREADYREGISTERED",
	ErrChannelIsFull:     "ERR_CHANNELISFULL",
	ErrInviteOnlyChan:    "ERR_INVITEONLYCHAN",
	ErrBannedFromChan:    "ERR_BANNEDFROMCHAN",
	ErrBadChannelKey:     "ERR_BADCHANNELKEY",
	ErrChanOpPrivsNeeded: "ERR_CHANOPRIVSNEEDED",
}

// 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]
}