/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2007 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 "users.h"
#include "channels.h"
#include "modules.h"
#include "inspircd.h"
#include "mode.h"

/* $ModDesc: Provides support for channel mode +P to block all-CAPS channel messages and notices */


/** Handles the +P channel mode
 */
class BlockCaps : public ModeHandler
{
 public:
	BlockCaps(InspIRCd* Instance) : ModeHandler(Instance, 'P', 0, 0, false, MODETYPE_CHANNEL, false) { }

	ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
	{
		if (adding)
		{
			if (!channel->IsModeSet('P'))
			{
				channel->SetMode('P',true);
				return MODEACTION_ALLOW;
			}
		}
		else
		{
			if (channel->IsModeSet('P'))
			{
				channel->SetMode('P',false);
				return MODEACTION_ALLOW;
			}
		}

		return MODEACTION_DENY;
	}
};

class ModuleBlockCAPS : public Module
{
	BlockCaps* bc;
	unsigned int percent;
	unsigned int minlen;
public:
	
	ModuleBlockCAPS(InspIRCd* Me) : Module::Module(Me)
	{
		OnRehash(NULL,"");
		bc = new BlockCaps(ServerInstance);
		if (!ServerInstance->AddMode(bc, 'P'))
			throw ModuleException("Could not add new modes!");
	}

	void Implements(char* List)
	{
		List[I_OnUserPreMessage] = List[I_OnUserPreNotice] = List[I_OnRehash] = 1;
	}

	virtual void OnRehash(userrec* user, const std::string &param)
	{
		ReadConf();
	}

	virtual int OnUserPreMessage(userrec* user,void* dest,int target_type, std::string &text, char status, CUList &exempt_list)
	{
		if (text.size() < minlen)
			return 0;

		if (target_type == TYPE_CHANNEL)
		{
			chanrec* c = (chanrec*)dest;

			if (c->IsModeSet('P'))
			{
				int caps = 0;
				for (std::string::iterator i = text.begin(); i != text.end(); i++)
				{
					if ( (*i >= 'A') && (*i <= 'Z'))
						caps++;
				}
				if ( (caps * 100 / text.size()) >= percent )
				{
					user->WriteServ( "404 %s %s :Can't send all-CAPS to channel (+P set)", user->nick, c->name);
					return 1;
				}
			}
		}
		return 0;
	}

	virtual int OnUserPreNotice(userrec* user,void* dest,int target_type, std::string &text, char status, CUList &exempt_list)
	{
		return OnUserPreMessage(user,dest,target_type,text,status,exempt_list);
	}

	void ReadConf()
	{
		ConfigReader Conf(ServerInstance);
		percent = Conf.ReadInteger("blockcaps", "percent", "100", 0, true);
		minlen = Conf.ReadInteger("blockcaps", "minlen", "0", 0, true);
		if (percent < 0 || percent > 100)
		{
			ServerInstance->Log(DEFAULT, "<blockcaps:percent> out of range, setting to default of 100.");
			percent = 100;
		}
		if (minlen < 0 || minlen > MAXBUF-1)
		{
			ServerInstance->Log(DEFAULT, "<blockcaps:minlen> out of range, setting to default of 0.");
			minlen = 0;
		}
	}

	virtual ~ModuleBlockCAPS()
	{
		ServerInstance->Modes->DelMode(bc);
		DELETE(bc);
	}

	virtual Version GetVersion()
	{
		return Version(1,1,0,0,VF_COMMON|VF_VENDOR,API_VERSION);
	}
};


class ModuleBlockCAPSFactory : public ModuleFactory
{
 public:
	ModuleBlockCAPSFactory()
	{
	}
	
	~ModuleBlockCAPSFactory()
	{
	}
	
	virtual Module * CreateModule(InspIRCd* Me)
	{
		return new ModuleBlockCAPS(Me);
	}
	
};


extern "C" void * init_module( void )
{
	return new ModuleBlockCAPSFactory;
}