/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2010 Daniel De Graaf <danieldg@inspircd.org>
 *   Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
 *   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 "commands.h"

#include "utils.h"
#include "treeserver.h"

CmdResult CommandUID::Handle(const parameterlist &params, User* serversrc)
{
	SpanningTreeUtilities* Utils = ((ModuleSpanningTree*)(Module*)creator)->Utils;
	/** Do we have enough parameters:
	 *      0    1    2    3    4    5        6        7     8        9       (n-1)
	 * UID uuid age nick host dhost ident ip.string signon +modes (modepara) :gecos
	 */
	time_t age_t = ConvToInt(params[1]);
	time_t signon = ConvToInt(params[7]);
	std::string empty;
	const std::string& modestr = params[8];

	TreeServer* remoteserver = Utils->FindServer(serversrc->server);

	if (!remoteserver)
		return CMD_INVALID;
	/* Is this a valid UID, and not misrouted? */
	if (params[0].length() != 9 || params[0].substr(0,3) != serversrc->uuid)
		return CMD_INVALID;
	/* Check parameters for validity before introducing the client, discovered by dmb */
	if (!age_t)
		return CMD_INVALID;
	if (!signon)
		return CMD_INVALID;
	if (modestr[0] != '+')
		return CMD_INVALID;
	TreeSocket* sock = remoteserver->GetRoute()->GetSocket();

	/* check for collision */
	user_hash::iterator iter = ServerInstance->Users->clientlist->find(params[2]);

	if (iter != ServerInstance->Users->clientlist->end())
	{
		/*
		 * Nick collision.
		 */
		int collide = sock->DoCollision(iter->second, age_t, params[5], params[6], params[0]);
		ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "*** Collision on %s, collide=%d", params[2].c_str(), collide);

		if (collide != 1)
		{
			/* remote client lost, make sure we change their nick for the hash too
			 *
			 * This alters the line that will be sent to other servers, which
			 * commands normally shouldn't do; hence the required const_cast.
			 */
			const_cast<parameterlist&>(params)[2] = params[0];
		}
	}

	/* IMPORTANT NOTE: For remote users, we pass the UUID in the constructor. This automatically
	 * sets it up in the UUID hash for us.
	 */
	User* _new = NULL;
	try
	{
		_new = new RemoteUser(params[0], remoteserver->GetName());
	}
	catch (...)
	{
		ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Duplicate UUID %s in client introduction", params[0].c_str());
		return CMD_INVALID;
	}
	(*(ServerInstance->Users->clientlist))[params[2]] = _new;
	_new->nick = params[2];
	_new->host = params[3];
	_new->dhost = params[4];
	_new->ident = params[5];
	_new->fullname = params[params.size() - 1];
	_new->registered = REG_ALL;
	_new->signon = signon;
	_new->age = age_t;

	unsigned int paramptr = 9;

	for (std::string::const_iterator v = modestr.begin(); v != modestr.end(); ++v)
	{
		// Accept more '+' chars, for now
		if (*v == '+')
			continue;

		/* For each mode thats set, find the mode handler and set it on the new user */
		ModeHandler* mh = ServerInstance->Modes->FindMode(*v, MODETYPE_USER);
		if (!mh)
		{
			ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Unrecognised mode '%c' for a user in UID, dropping link", *v);
			return CMD_INVALID;
		}

		if (mh->GetNumParams(true))
		{
			if (paramptr >= params.size() - 1)
				return CMD_INVALID;
			std::string mp = params[paramptr++];
			/* IMPORTANT NOTE:
			 * All modes are assumed to succeed here as they are being set by a remote server.
			 * Modes CANNOT FAIL here. If they DO fail, then the failure is ignored. This is important
			 * to note as all but one modules currently cannot ever fail in this situation, except for
			 * m_servprotect which specifically works this way to prevent the mode being set ANYWHERE
			 * but here, at client introduction. You may safely assume this behaviour is standard and
			 * will not change in future versions if you want to make use of this protective behaviour
			 * yourself.
			 */
			mh->OnModeChange(_new, _new, NULL, mp, true);
		}
		else
			mh->OnModeChange(_new, _new, NULL, empty, true);
		_new->SetMode(mh, true);
	}

	_new->SetClientIP(params[6].c_str());

	ServerInstance->Users->AddGlobalClone(_new);
	remoteserver->UserCount++;

	bool dosend = true;

	if ((Utils->quiet_bursts && remoteserver->bursting) || ServerInstance->SilentULine(_new->server))
		dosend = false;

	if (dosend)
		ServerInstance->SNO->WriteToSnoMask('C',"Client connecting at %s: %s (%s) [%s]", _new->server.c_str(), _new->GetFullRealHost().c_str(), _new->GetIPString().c_str(), _new->fullname.c_str());

	FOREACH_MOD(I_OnPostConnect,OnPostConnect(_new));

	return CMD_SUCCESS;
}

CmdResult CommandFHost::Handle(const parameterlist &params, User* src)
{
	if (IS_SERVER(src))
		return CMD_FAILURE;
	src->ChangeDisplayedHost(params[0].c_str());
	return CMD_SUCCESS;
}

CmdResult CommandFIdent::Handle(const parameterlist &params, User* src)
{
	if (IS_SERVER(src))
		return CMD_FAILURE;
	src->ChangeIdent(params[0].c_str());
	return CMD_SUCCESS;
}

CmdResult CommandFName::Handle(const parameterlist &params, User* src)
{
	if (IS_SERVER(src))
		return CMD_FAILURE;
	src->ChangeName(params[0].c_str());
	return CMD_SUCCESS;
}