/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2018-2020 Sadie Powell <sadie@witchery.services>
 *   Copyright (C) 2018 Attila Molnar <attilamolnar@hush.com>
 *
 * 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"

ClientProtocol::Serializer::Serializer(Module* mod, const char* Name)
	: DataProvider(mod, std::string("serializer/") + Name)
	, evprov(mod)
{
}

bool ClientProtocol::Serializer::HandleTag(LocalUser* user, const std::string& tagname, std::string& tagvalue, TagMap& tags) const
{
	// Catch and block empty tags
	if (tagname.empty())
		return false;

	const ::Events::ModuleEventProvider::SubscriberList& list = evprov.GetSubscribers();
	for (::Events::ModuleEventProvider::SubscriberList::const_iterator i = list.begin(); i != list.end(); ++i)
	{
		MessageTagProvider* const tagprov = static_cast<MessageTagProvider*>(*i);
		const ModResult res = tagprov->OnProcessTag(user, tagname, tagvalue);
		if (res == MOD_RES_ALLOW)
			return tags.insert(std::make_pair(tagname, MessageTagData(tagprov, tagvalue))).second;
		else if (res == MOD_RES_DENY)
			break;
	}

	// No module handles the tag but that's not an error
	return true;
}

ClientProtocol::TagSelection ClientProtocol::Serializer::MakeTagWhitelist(LocalUser* user, const TagMap& tagmap) const
{
	TagSelection tagwl;
	for (TagMap::const_iterator i = tagmap.begin(); i != tagmap.end(); ++i)
	{
		const MessageTagData& tagdata = i->second;
		if (tagdata.tagprov->ShouldSendTag(user, tagdata))
			tagwl.Select(tagmap, i);
	}
	return tagwl;
}

const ClientProtocol::SerializedMessage& ClientProtocol::Serializer::SerializeForUser(LocalUser* user, Message& msg)
{
	if (!msg.msginit_done)
	{
		msg.msginit_done = true;
		FOREACH_MOD_CUSTOM(evprov, MessageTagProvider, OnPopulateTags, (msg));
	}
	return msg.GetSerialized(Message::SerializedInfo(this, MakeTagWhitelist(user, msg.GetTags())));
}

const ClientProtocol::SerializedMessage& ClientProtocol::Message::GetSerialized(const SerializedInfo& serializeinfo) const
{
	// First check if the serialized line they're asking for is in the cache
	for (SerializedList::const_iterator i = serlist.begin(); i != serlist.end(); ++i)
	{
		const SerializedInfo& curr = i->first;
		if (curr == serializeinfo)
			return i->second;
	}

	// Not cached, generate it and put it in the cache for later use
	serlist.push_back(std::make_pair(serializeinfo, serializeinfo.serializer->Serialize(*this, serializeinfo.tagwl)));
	return serlist.back().second;
}

void ClientProtocol::Event::GetMessagesForUser(LocalUser* user, MessageList& messagelist)
{
	if (!eventinit_done)
	{
		eventinit_done = true;
		FOREACH_MOD_CUSTOM(*event, EventHook, OnEventInit, (*this));
	}

	// Most of the time there's only a single message but in rare cases there are more
	if (initialmsg)
		messagelist.assign(1, initialmsg);
	else
		messagelist = *initialmsglist;

	// Let modules modify the message list
	ModResult res;
	FIRST_MOD_RESULT_CUSTOM(*event, EventHook, OnPreEventSend, res, (user, *this, messagelist));
	if (res == MOD_RES_DENY)
		messagelist.clear();
}