/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2010 InspIRCd Development Team
 * See: http://wiki.inspircd.org/Credits
 *
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#include "inspircd.h"
#include "commands.h"

#include "utils.h"
#include "link.h"
#include "treesocket.h"
#include "treeserver.h"
#include "resolvers.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
	 */
	if (params.size() < 10)
		return CMD_INVALID;

	time_t age_t = ConvToInt(params[1]);
	time_t signon = ConvToInt(params[7]);
	std::string empty;
	std::string nick(params[2]);
	std::string modestr(params[8]);

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

	if (!remoteserver)
		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(nick);

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

		if (collide != 1)
		{
			/* remote client changed, make sure we change their nick for the hash too */
			nick = 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 (...)
	{
		return CMD_INVALID;
	}
	(*(ServerInstance->Users->clientlist))[nick] = _new;
	_new->nick = nick;
	_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;

	/* we need to remove the + from the modestring, so we can do our stuff */
	std::string::size_type pos_after_plus = modestr.find_first_not_of('+');
	if (pos_after_plus != std::string::npos)
	modestr = modestr.substr(pos_after_plus);

	unsigned int paramptr = 9;
	for (std::string::iterator v = modestr.begin(); v != modestr.end(); v++)
	{
		if (*v == '+')
			continue;

		/* For each mode thats set, increase counter */
		ModeHandler* mh = ServerInstance->Modes->FindMode(*v, MODETYPE_USER);

		if (mh)
		{
			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(*v, true);
		}
	}

	/* now we've done with modes processing, put the + back for remote servers */
	if (modestr[0] != '+')
		modestr = "+" + modestr;

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

	ServerInstance->Users->AddGlobalClone(_new);
	remoteserver->SetUserCount(1); // increment by 1

	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 [%s] [%s]", _new->server.c_str(), _new->nick.c_str(), _new->ident.c_str(), _new->host.c_str(), _new->GetIPString(), _new->fullname.c_str());

	FOREACH_MOD(I_OnPostConnect,OnPostConnect(_new));

	return CMD_SUCCESS;
}

CmdResult CommandFHost::Handle(const parameterlist &params, User* src)
{
	if (params.size() < 1)
		return CMD_INVALID;
	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 (params.size() < 1)
		return CMD_INVALID;
	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 (params.size() < 1)
		return CMD_INVALID;
	if (IS_SERVER(src))
		return CMD_FAILURE;
	src->ChangeName(params[0].c_str());
	return CMD_SUCCESS;
}

