/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
 *
 * This file is part of InspIRCd.  InspIRCd is free software: you can
 * redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation, version 2.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */


#include "inspircd.h"
#include "m_cap.h"

/* $ModDesc: Provides the CAP negotiation mechanism seen in ratbox-derived ircds */

/*
CAP LS
:alfred.staticbox.net CAP * LS :multi-prefix sasl
CAP REQ :multi-prefix
:alfred.staticbox.net CAP * ACK :multi-prefix
CAP CLEAR
:alfred.staticbox.net CAP * ACK :-multi-prefix
CAP REQ :multi-prefix
:alfred.staticbox.net CAP * ACK :multi-prefix
CAP LIST
:alfred.staticbox.net CAP * LIST :multi-prefix
CAP END
*/

/** Handle /CAP
 */
class CommandCAP : public Command
{
	Module* Creator;
 public:
	CommandCAP (InspIRCd* Instance, Module* mod) : Command(Instance,"CAP", 0, 1, true), Creator(mod)
	{
		this->source = "m_cap.so";
	}

	CmdResult Handle (const std::vector<std::string> &parameters, User *user)
	{
		irc::string subcommand = parameters[0].c_str();

		if (subcommand == "REQ")
		{
			CapData Data;

			Data.type = subcommand;
			Data.user = user;
			Data.creator = this->Creator;

			if (parameters.size() < 2)
				return CMD_FAILURE;

			// tokenize the input into a nice list of requested caps
			std::string param = parameters[1];
			std::string cap_;
			irc::spacesepstream cap_stream(param);

			while (cap_stream.GetToken(cap_))
			{
				Data.wanted.push_back(cap_);
			}

			user->Extend("CAP_REGHOLD");
			Event event((char*) &Data, (Module*)this->Creator, "cap_req");
			event.Send(this->ServerInstance);

			if (Data.ack.size() > 0)
			{
				std::string AckResult = irc::stringjoiner(" ", Data.ack, 0, Data.ack.size() - 1).GetJoined();
				user->WriteServ("CAP * ACK :%s", AckResult.c_str());
			}

			if (Data.wanted.size() > 0)
			{
				std::string NakResult = irc::stringjoiner(" ", Data.wanted, 0, Data.wanted.size() - 1).GetJoined();
				user->WriteServ("CAP * NAK :%s", NakResult.c_str());
			}
		}
		else if (subcommand == "END")
		{
			user->Shrink("CAP_REGHOLD");
		}
		else if ((subcommand == "LS") || (subcommand == "LIST"))
		{
			CapData Data;

			Data.type = subcommand;
			Data.user = user;
			Data.creator = this->Creator;

			user->Extend("CAP_REGHOLD");
			Event event((char*) &Data, (Module*)this->Creator, subcommand == "LS" ? "cap_ls" : "cap_list");
			event.Send(this->ServerInstance);

			std::string Result;
			if (Data.wanted.size() > 0)
				Result = irc::stringjoiner(" ", Data.wanted, 0, Data.wanted.size() - 1).GetJoined();
			else
				Result = "";

			user->WriteServ("CAP * %s :%s", subcommand.c_str(), Result.c_str());
		}
		else if (subcommand == "CLEAR")
		{
			CapData Data;

			Data.type = subcommand;
			Data.user = user;
			Data.creator = this->Creator;

			user->Extend("CAP_REGHOLD");
			Event event((char*) &Data, (Module*)this->Creator, "cap_clear");
			event.Send(this->ServerInstance);

			std::string Result = irc::stringjoiner(" ", Data.ack, 0, Data.ack.size() - 1).GetJoined();
			user->WriteServ("CAP * ACK :%s", Result.c_str());
		}
		else
		{
			user->WriteNumeric(ERR_INVALIDCAPSUBCOMMAND, "* %s :Invalid CAP subcommand", subcommand.c_str());
		}

		return CMD_FAILURE;
	}
};

class ModuleCAP : public Module
{
	CommandCAP* newcommand;
 public:
	ModuleCAP(InspIRCd* Me)
		: Module(Me)
	{
		// Create a new command
		newcommand = new CommandCAP(ServerInstance, this);
		ServerInstance->AddCommand(newcommand);

		Implementation eventlist[] = { I_OnCheckReady };
		ServerInstance->Modules->Attach(eventlist, this, 1);
	}

	virtual bool OnCheckReady(User* user)
	{
		/* Users in CAP state get held until CAP END */
		if (user->GetExt("CAP_REGHOLD"))
			return false;

		return true;
	}

	virtual ~ModuleCAP()
	{
	}

	virtual Version GetVersion()
	{
		return Version("$Id$", VF_VENDOR, API_VERSION);
	}
};

MODULE_INIT(ModuleCAP)