/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
 * See: http://www.inspircd.org/wiki/index.php/Credits
 *
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#include "inspircd.h"
#include "wildcard.h"

/* $ModDesc: Implements config tags which allow blocking of joins to channels */

class ModuleDenyChannels : public Module
{
 private:

	
	ConfigReader *Conf;

 public:
	ModuleDenyChannels(InspIRCd* Me) : Module(Me)
	{
		
		Conf = new ConfigReader(ServerInstance);
		Implementation eventlist[] = { I_OnUserPreJoin, I_OnRehash };
		ServerInstance->Modules->Attach(eventlist, this, 2);
	}
	
	virtual void OnRehash(User* user, const std::string &param)
	{
		delete Conf;
		Conf = new ConfigReader(ServerInstance);
		/* check for redirect validity and loops/chains */
		for (int i =0; i < Conf->Enumerate("badchan"); i++)
		{
			std::string name = Conf->ReadValue("badchan","name",i);
			std::string redirect = Conf->ReadValue("badchan","redirect",i);
			
			if (!redirect.empty())
			{
			
				if (!ServerInstance->IsChannel(redirect.c_str()))
				{
					if (user)
						user->WriteServ("Notice %s :Invalid badchan redirect '%s'", user->nick, redirect.c_str());
					throw ModuleException("Invalid badchan redirect, not a channel");
				}
	
				for (int j =0; j < Conf->Enumerate("badchan"); j++)
				{
					if (match(redirect.c_str(), Conf->ReadValue("badchan","name",j).c_str()))
					{
						bool goodchan = false;
						for (int k =0; k < Conf->Enumerate("goodchan"); k++)
						{
							if (match(redirect.c_str(), Conf->ReadValue("goodchan","name",k).c_str()))
								goodchan = true;
						}
	
						if (!goodchan)
						{
							/* <badchan:redirect> is a badchan */
							if (user)
								user->WriteServ("NOTICE %s :Badchan %s redirects to badchan %s", user->nick, name.c_str(), redirect.c_str());
							throw ModuleException("Badchan redirect loop");
						}
					}
				}
			}
		}
	}

	virtual ~ModuleDenyChannels()
	{
		delete Conf;
	}
	
	virtual Version GetVersion()
	{
		return Version(1,1,0,1,VF_VENDOR,API_VERSION);
	}


	virtual int OnUserPreJoin(User* user, Channel* chan, const char* cname, std::string &privs)
	{
		for (int j =0; j < Conf->Enumerate("badchan"); j++)
		{
			if (match(cname, Conf->ReadValue("badchan","name",j).c_str()))
			{
				if (IS_OPER(user) && Conf->ReadFlag("badchan","allowopers",j))
				{
					return 0;
				}
				else
				{
					std::string reason = Conf->ReadValue("badchan","reason",j);
					std::string redirect = Conf->ReadValue("badchan","redirect",j);

					for (int i = 0; i < Conf->Enumerate("goodchan"); i++)
					{
						if (match(cname, Conf->ReadValue("goodchan", "name", i).c_str()))
						{
							return 0;
						}
					}
					
					if (ServerInstance->IsChannel(redirect.c_str()))
					{
						/* simple way to avoid potential loops: don't redirect to +L channels */
						Channel *newchan = ServerInstance->FindChan(redirect);
						if ((!newchan) || (!(newchan->IsModeSet('L'))))
						{
							user->WriteServ("926 %s %s :Channel %s is forbidden, redirecting to %s: %s",user->nick,cname,cname,redirect.c_str(), reason.c_str());
							Channel::JoinUser(ServerInstance,user,redirect.c_str(),false,"",false,ServerInstance->Time(true));
							return 1;
						}
					}

					user->WriteServ("926 %s %s :Channel %s is forbidden: %s",user->nick,cname,cname,reason.c_str());
					return 1;
				}
			}
		}
		return 0;
	}
};

MODULE_INIT(ModuleDenyChannels)