/** 
 * @file llmessageconfig.cpp
 * @brief Live file handling for messaging
 *
 * $LicenseInfo:firstyear=2000&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "linden_common.h"

#include "llmessageconfig.h"
#include "llfile.h"
#include "lllivefile.h"
#include "llsd.h"
#include "llsdutil.h"
#include "llsdserialize.h"
#include "message.h"

static const char messageConfigFileName[] = "message.xml";
static const F32 messageConfigRefreshRate = 5.0; // seconds

static std::string sServerName = "";
static std::string sConfigDir = "";

static std::string sServerDefault;
static LLSD sMessages;


class LLMessageConfigFile : public LLLiveFile
{
public:
	LLMessageConfigFile() :
		LLLiveFile(filename(), messageConfigRefreshRate),
		mMaxQueuedEvents(0)
            { }

	static std::string filename();

	LLSD mMessages;
	std::string mServerDefault;
	
	static LLMessageConfigFile& instance();
		// return the singleton configuration file

	/* virtual */ bool loadFile();
	void loadServerDefaults(const LLSD& data);
	void loadMaxQueuedEvents(const LLSD& data);
	void loadMessages(const LLSD& data);
	void loadCapBans(const LLSD& blacklist);
	void loadMessageBans(const LLSD& blacklist);
	bool isCapBanned(const std::string& cap_name) const;

public:
	LLSD mCapBans;
	S32 mMaxQueuedEvents;

private:
	static const S32 DEFAULT_MAX_QUEUED_EVENTS = 100;
};

std::string LLMessageConfigFile::filename()
{
    std::ostringstream ostr;
	ostr << sConfigDir//gAppSimp->getOption("configdir").asString()
		<< "/" << messageConfigFileName;
	return ostr.str();
}

LLMessageConfigFile& LLMessageConfigFile::instance()
{
	static LLMessageConfigFile the_file;
	the_file.checkAndReload();
	return the_file;
}

// virtual
bool LLMessageConfigFile::loadFile()
{
	LLSD data;
    {
        llifstream file(filename().c_str());
        
        if (file.is_open())
        {
			LL_DEBUGS("AppInit") << "Loading message.xml file at " << filename() << LL_ENDL;
            LLSDSerialize::fromXML(data, file);
        }

        if (data.isUndefined())
        {
            LL_INFOS("AppInit") << "LLMessageConfigFile::loadFile: file missing,"
				" ill-formed, or simply undefined; not changing the"
				" file" << LL_ENDL;
            return false;
        }
    }
	loadServerDefaults(data);
	loadMaxQueuedEvents(data);
	loadMessages(data);
	loadCapBans(data);
	loadMessageBans(data);
	return true;
}

void LLMessageConfigFile::loadServerDefaults(const LLSD& data)
{
	mServerDefault = data["serverDefaults"][sServerName].asString();
}

void LLMessageConfigFile::loadMaxQueuedEvents(const LLSD& data)
{
	 if (data.has("maxQueuedEvents"))
	 {
		  mMaxQueuedEvents = data["maxQueuedEvents"].asInteger();
	 }
	 else
	 {
		  mMaxQueuedEvents = DEFAULT_MAX_QUEUED_EVENTS;
	 }
}

void LLMessageConfigFile::loadMessages(const LLSD& data)
{
	mMessages = data["messages"];

#ifdef DEBUG
	std::ostringstream out;
	LLSDXMLFormatter *formatter = new LLSDXMLFormatter;
	formatter->format(mMessages, out);
	LL_INFOS() << "loading ... " << out.str()
			<< " LLMessageConfigFile::loadMessages loaded "
			<< mMessages.size() << " messages" << LL_ENDL;
#endif
}

void LLMessageConfigFile::loadCapBans(const LLSD& data)
{
    LLSD bans = data["capBans"];
    if (!bans.isMap())
    {
        LL_INFOS("AppInit") << "LLMessageConfigFile::loadCapBans: missing capBans section"
            << LL_ENDL;
        return;
    }
    
	mCapBans = bans;
    
    LL_DEBUGS("AppInit") << "LLMessageConfigFile::loadCapBans: "
        << bans.size() << " ban tests" << LL_ENDL;
}

void LLMessageConfigFile::loadMessageBans(const LLSD& data)
{
    LLSD bans = data["messageBans"];
    if (!bans.isMap())
    {
        LL_INFOS("AppInit") << "LLMessageConfigFile::loadMessageBans: missing messageBans section"
            << LL_ENDL;
        return;
    }
    
	gMessageSystem->setMessageBans(bans["trusted"], bans["untrusted"]);
}

bool LLMessageConfigFile::isCapBanned(const std::string& cap_name) const
{
	LL_DEBUGS() << "mCapBans is " << LLSDNotationStreamer(mCapBans) << LL_ENDL;
    return mCapBans[cap_name];
}

//---------------------------------------------------------------
// LLMessageConfig
//---------------------------------------------------------------

//static
void LLMessageConfig::initClass(const std::string& server_name,
								const std::string& config_dir)
{
	sServerName = server_name;
	sConfigDir = config_dir;
	(void) LLMessageConfigFile::instance();
	LL_DEBUGS("AppInit") << "LLMessageConfig::initClass config file "
			<< config_dir << "/" << messageConfigFileName << LL_ENDL;
}

//static
void LLMessageConfig::useConfig(const LLSD& config)
{
	LLMessageConfigFile &the_file = LLMessageConfigFile::instance();
	the_file.loadServerDefaults(config);
	the_file.loadMaxQueuedEvents(config);
	the_file.loadMessages(config);
	the_file.loadCapBans(config);
	the_file.loadMessageBans(config);
}

//static
LLMessageConfig::Flavor LLMessageConfig::getServerDefaultFlavor()
{
	LLMessageConfigFile& file = LLMessageConfigFile::instance();
	if (file.mServerDefault == "llsd")
	{
		return LLSD_FLAVOR;
	}
	if (file.mServerDefault == "template")
	{
		return TEMPLATE_FLAVOR;
	}
	return NO_FLAVOR;
}

//static
S32 LLMessageConfig::getMaxQueuedEvents()
{
	LLMessageConfigFile& file = LLMessageConfigFile::instance();
	return file.mMaxQueuedEvents;
}

//static
LLMessageConfig::Flavor LLMessageConfig::getMessageFlavor(const std::string& msg_name)
{
	LLMessageConfigFile& file = LLMessageConfigFile::instance();
	LLSD config = file.mMessages[msg_name];
	if (config["flavor"].asString() == "llsd")
	{
		return LLSD_FLAVOR;
	}
	if (config["flavor"].asString() == "template")
	{
		return TEMPLATE_FLAVOR;
	}
	return NO_FLAVOR;
}

//static
LLMessageConfig::SenderTrust LLMessageConfig::getSenderTrustedness(
	const std::string& msg_name)
{
	LLMessageConfigFile& file = LLMessageConfigFile::instance();
	LLSD config = file.mMessages[msg_name];
	if (config.has("trusted-sender"))
	{
		return config["trusted-sender"].asBoolean() ? TRUSTED : UNTRUSTED;
	}
	return NOT_SET;
}

//static
bool LLMessageConfig::isValidMessage(const std::string& msg_name)
{
	if (sServerName.empty())
	{
		LL_ERRS() << "LLMessageConfig::initClass() not called" << LL_ENDL;
	}
	LLMessageConfigFile& file = LLMessageConfigFile::instance();
	return file.mMessages.has(msg_name);
}

//static
bool LLMessageConfig::onlySendLatest(const std::string& msg_name)
{
	LLMessageConfigFile& file = LLMessageConfigFile::instance();
	LLSD config = file.mMessages[msg_name];
	return config["only-send-latest"].asBoolean();
}

bool LLMessageConfig::isCapBanned(const std::string& cap_name)
{
	return LLMessageConfigFile::instance().isCapBanned(cap_name);
}

// return the web-service path to use for a given
// message. This entry *should* match the entry
// in simulator.xml!
LLSD LLMessageConfig::getConfigForMessage(const std::string& msg_name)
{
	if (sServerName.empty())
	{
		LL_ERRS() << "LLMessageConfig::isMessageTrusted(name) before"
				<< " LLMessageConfig::initClass()" << LL_ENDL;
	}
	LLMessageConfigFile& file = LLMessageConfigFile::instance();
	// LLSD for the CamelCase message name
	LLSD config = file.mMessages[msg_name];
	return config;
}
