package irc

func (s *ircd) processIRCMessage(m *ircMessage) {
	// FIXME put all of these in a map of string->function
	// and dispatch them that way instead
	switch m.command {
	case "CAP":
		s.processCAPCommand(m)
	case "NICK":
		s.processNICKCommand(m)
	case "USER":
		s.processUSERCommand(m)
	default:
		s.processUnknownCommand(m)
	}
	s.log.Infof("client<%s> sent %+v", m.from.Id, m)
}

func (s *ircd) sayHello(c *ircClient) {
	//001 welcome
	//002 host/version decl
	//003, 004, 005, 251, 252, 253, 254, 255, 256, 266
	//375 (begin motd)
	//372 motd (repeating)
	//376 end motd
	// change user mode (from server) :sneak!sneak@butt9q8.a.b.IP MODE sneak :+x
	/*
		:irc.butt.es 001 sneak :Welcome to the Buttes IRC Network sneak!sneak@1.2.3.4
		:irc.butt.es 002 sneak :Your host is irc.butt.es, running version InspIRCd-3
		:irc.butt.es 003 sneak :This server was created 09:33:24 Aug 05 2019
		:irc.butt.es 004 sneak irc.butt.es InspIRCd-3 BHIRSWcghiorswxz ACFHIMNOPQRSTXYZbcefijklmnoprstvwz :FHIXYZbefjklovw
		:irc.butt.es 005 sneak ACCEPT=30 AWAYLEN=200 CALLERID=g CASEMAPPING=ascii CHANLIMIT=#:20 CHANMODES=IXYZbew,k,FHfjl,ACMNOPQRSTcimnprstz CHANNELLEN=64 CHANTYPES=# ELIST=CMNTU ESILENCE=CcdiNnPpTtx EXCEPTS=e EXTBAN=,ACGNOQRSTUacjmprz :are supported by this server
		:irc.butt.es 005 sneak HOSTLEN=64 INVEX=I KEYLEN=32 KICKLEN=255 LINELEN=512 MAXLIST=IXbew:512 MAXTARGETS=20 MODES=20 NAMESX NETWORK=Buttes NICKLEN=32 OPERLOG OVERRIDE :are supported by this server
		:irc.butt.es 005 sneak PREFIX=(ov)@+ REMOVE SAFELIST SECURELIST SILENCE=32 STATUSMSG=@+ TOPICLEN=500 USERIP USERLEN=11 VBANLIST WHOX :are supported by this server
		:irc.butt.es 251 sneak :There are 34 users and 33 invisible on 2 servers
		:irc.butt.es 252 sneak 2 :operator(s) online
		:irc.butt.es 253 sneak 1 :unknown connections
		:irc.butt.es 254 sneak 33 :channels formed
		:irc.butt.es 255 sneak :I have 60 clients and 1 servers
		:irc.butt.es 265 sneak :Current local users: 60  Max: 65
		:irc.butt.es 266 sneak :Current global users: 67  Max: 72
		:irc.butt.es 375 sneak :irc.butt.es message of the day
		:irc.butt.es 372 sneak :-                   ____  _   _ _____ _____ _____ ____
		:irc.butt.es 372 sneak :-                  | __ )| | | |_   _|_   _| ____/ ___|
		:irc.butt.es 372 sneak :-                  |  _ \| | | | | |   | | |  _| \___ \

		:irc.butt.es 376 sneak :End of message of the day.
		:irc.butt.es 396 sneak butt9q8.a.b.IP :is now your displayed host
		:sneak!sneak@butt9q8.a.b.IP MODE sneak :+x
	*/
}

func (s *ircd) processUnknownCommand(m *ircMessage) {
	m.from.RespUnknownCommand(m.command)
	if m.from.session.CheckState("init") {
		// if they are sending weird commands before NICK/USER, just drop
		// them
		// FIXME send an error
		m.from.Kill()
	}
}

func (s *ircd) processNICKCommand(m *ircMessage) {
	//FIXME check if nick is in use
	//FIXME check if nick is valid
	s.log.Infof("%+v", m)
	s.log.Infof("%+v", m.params)
	s.log.Infof("%+v", m.from)
	s.log.Infof("%+v", m.from.session)
	if len(m.params) == 1 {
		m.from.session.SetNick(m.params[0])
		s.log.Infof("conn<%s> NICK %s", m.from.Id, m.params[0])
	}
}

func (s *ircd) processUSERCommand(m *ircMessage) {
	// FIXME fail/disconnect if nick not yet set
	// FIXME fail if run a second time
	// FIXME tbh the client connection should be an FSM that limits usage of
	// certain valid commands per-state
	//params: <username> <hostname> <servername> <realname>
	if !m.from.session.CheckState("init") {
		// can only do this when going init->normal
		// FIXME send an error
		m.from.Kill()
	}

	if m.from.session.SetUserInfo(m.params) { //this changes the session state
		s.log.Infof("%+v", m.from.session)
		s.sayHello(m.from)
	} else {
		// FIXME send an error
		m.from.Kill() // bye felicia
	}
}

func (s *ircd) processCAPCommand(m *ircMessage) {
	s.log.Debugln("ignoring CAP command, unsupported")
	// pass
}