/*       +------------------------------------+
 *       | 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"

/* $ModDesc: Provides the SWHOIS command which allows setting of arbitary WHOIS lines */

/** Handle /SWHOIS
 */
class CommandSwhois : public Command
{
	
 public:
	CommandSwhois (InspIRCd* Instance) : Command(Instance,"SWHOIS","o",2)
	{
		this->source = "m_swhois.so";
		syntax = "<nick> <swhois>";
		TRANSLATE3(TR_NICK, TR_TEXT, TR_END);
	}

	CmdResult Handle(const char* const* parameters, int pcnt, User* user)
	{
		User* dest = ServerInstance->FindNick(parameters[0]);
		
		if (!dest)
		{
			user->WriteNumeric(401, "%s %s :No such nick/channel", user->nick, parameters[0]);
			return CMD_FAILURE;
		}

		std::string line;
		for (int i = 1; i < pcnt; i++)
		{
			if (i != 1)
				line.append(" ");
				
			line.append(parameters[i]);
		}
		
		std::string* text;
		dest->GetExt("swhois", text);

		if (text)
		{
			// We already had it set...
			if (!ServerInstance->ULine(user->server))
				// Ulines set SWHOISes silently
				ServerInstance->SNO->WriteToSnoMask('A', "%s used SWHOIS to set %s's extra whois from '%s' to '%s'", user->nick, dest->nick, text->c_str(), line.c_str());
			
			dest->Shrink("swhois");
			delete text;
		}
		else if (!ServerInstance->ULine(user->server))
		{
			// Ulines set SWHOISes silently
			ServerInstance->SNO->WriteToSnoMask('A', "%s used SWHOIS to set %s's extra whois to '%s'", user->nick, dest->nick, line.c_str());
		}
		
		text = new std::string(line);
		dest->Extend("swhois", text);

		/* Bug #376 - feature request -
		 * To cut down on the amount of commands services etc have to recognise, this only sends METADATA across the network now
		 * not an actual SWHOIS command. Any SWHOIS command sent from services will be automatically translated to METADATA by this.
		 * Sorry w00t i know this was your fix, but i got bored and wanted to clear down the tracker :)
		 * -- Brain
		 */
 		std::deque<std::string>* metadata = new std::deque<std::string>;
		metadata->push_back(dest->nick);
		metadata->push_back("swhois");          // The metadata id
		metadata->push_back(*text);             // The value to send
		Event event((char*)metadata,(Module*)this,"send_metadata");
		event.Send(ServerInstance);
		delete metadata;
		
		// If it's an empty swhois, unset it (not ideal, but ok)
		if (text->empty())
		{
			dest->Shrink("swhois");
			delete text;
		}

		return CMD_LOCALONLY;
	}

};

class ModuleSWhois : public Module
{
	CommandSwhois* mycommand;
	
	ConfigReader* Conf;
	
 public:
	ModuleSWhois(InspIRCd* Me) : Module(Me)
	{
		
		Conf = new ConfigReader(ServerInstance);
		mycommand = new CommandSwhois(ServerInstance);
		ServerInstance->AddCommand(mycommand);
		Implementation eventlist[] = { I_OnDecodeMetaData, I_OnWhoisLine, I_OnSyncUserMetaData, I_OnUserQuit, I_OnCleanup, I_OnRehash, I_OnPostCommand };
		ServerInstance->Modules->Attach(eventlist, this, 7);
	}

	void OnRehash(User* user, const std::string &parameter)
	{
		delete Conf;
		Conf = new ConfigReader(ServerInstance);
	}


	// :kenny.chatspike.net 320 Brain Azhrarn :is getting paid to play games.
	int OnWhoisLine(User* user, User* dest, int &numeric, std::string &text)
	{
		/* We use this and not OnWhois because this triggers for remote, too */
		if (numeric == 312)
		{
			/* Insert our numeric before 312 */
			std::string* swhois;
			dest->GetExt("swhois", swhois);
			if (swhois)
			{
				ServerInstance->SendWhoisLine(user, dest, 320, "%s %s :%s",user->nick,dest->nick,swhois->c_str());
			}
		}

		/* Dont block anything */
		return 0;
	}

	// Whenever the linking module wants to send out data, but doesnt know what the data
	// represents (e.g. it is metadata, added to a User or Channel by a module) then
	// this method is called. We should use the ProtoSendMetaData function after we've
	// corrected decided how the data should look, to send the metadata on its way if
	// it is ours.
	virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
	{
		// check if the linking module wants to know about OUR metadata
		if (extname == "swhois")
		{
			// check if this user has an swhois field to send
			std::string* swhois;
			user->GetExt("swhois", swhois);
			if (swhois)
			{
				// call this function in the linking module, let it format the data how it
				// sees fit, and send it on its way. We dont need or want to know how.
				proto->ProtoSendMetaData(opaque,TYPE_USER,user,extname,*swhois);
			}
		}
	}

	// when a user quits, tidy up their metadata
	virtual void OnUserQuit(User* user, const std::string &message, const std::string &oper_message)
	{
		std::string* swhois;
		user->GetExt("swhois", swhois);
		if (swhois)
		{
			user->Shrink("swhois");
			delete swhois;
		}
	}

	// if the module is unloaded, tidy up all our dangling metadata
	virtual void OnCleanup(int target_type, void* item)
	{
		if (target_type == TYPE_USER)
		{
			User* user = (User*)item;
			std::string* swhois;
			user->GetExt("swhois", swhois);
			if (swhois)
			{
				user->Shrink("swhois");
				delete swhois;
			}
		}
	}

	// Whenever the linking module receives metadata from another server and doesnt know what
	// to do with it (of course, hence the 'meta') it calls this method, and it is up to each
	// module in turn to figure out if this metadata key belongs to them, and what they want
	// to do with it.
	// In our case we're only sending a single string around, so we just construct a std::string.
	// Some modules will probably get much more complex and format more detailed structs and classes
	// in a textual way for sending over the link.
	virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
	{
		// check if its our metadata key, and its associated with a user
		if ((target_type == TYPE_USER) && (extname == "swhois"))
		{
			User* dest = (User*)target;

			// if they already have an swhois field, trash it and replace it with the remote one.
			std::string* text;
			if (dest->GetExt("swhois", text))
			{
				user->Shrink("swhois");
				delete text;
			}

			text2 = new std::string(extdata);
			dest->Extend("swhois", text);
		}
	}
	
	virtual void OnPostCommand(const std::string &command, const char* const* params, int pcnt, User *user, CmdResult result, const std::string &original_line)
	{
		if ((command != "OPER") || (result != CMD_SUCCESS))
			return;
		
		std::string swhois;
		
		for (int i = 0; i < Conf->Enumerate("oper"); i++)
		{
			std::string name = Conf->ReadValue("oper", "name", i);
			
			if (name == params[0])
			{
				swhois = Conf->ReadValue("oper", "swhois", i);
				break;
			}
		}
		
		if (!swhois.length())
		{
			for (int i = 0; i < Conf->Enumerate("type"); i++)
			{
				std::string type = Conf->ReadValue("type", "name", i);
				
				if (type == user->oper)
				{
					swhois = Conf->ReadValue("type", "swhois", i);
					break;
				}
			}
		}

		std::string *old;
		if (user->GetExt("swhois", old))
		{
			user->Shrink("swhois");
			delete old;
		}
		
		if (!swhois.length())
			return;
		
		std::string *text = new std::string(swhois);
		user->Extend("swhois", text);
		std::deque<std::string>* metadata = new std::deque<std::string>;
		metadata->push_back(user->nick);
		metadata->push_back("swhois");		// The metadata id
		metadata->push_back(*text);		// The value to send
		Event event((char*)metadata,(Module*)this,"send_metadata");
		event.Send(ServerInstance);
		delete metadata;
	}

	virtual ~ModuleSWhois()
	{
		delete Conf;
	}
	
	virtual Version GetVersion()
	{
		return Version(1, 2, 0, 0, VF_COMMON | VF_VENDOR, API_VERSION);
	}
};

MODULE_INIT(ModuleSWhois)