/** 
 * @file llviewerdisplayname.cpp
 * @brief Wrapper for display name functionality
 *
 * $LicenseInfo:firstyear=2010&license=viewerlgpl$
 * 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 "llviewerprecompiledheaders.h"

#include "llviewerdisplayname.h"

// viewer includes
#include "llagent.h"
#include "llviewerregion.h"
#include "llvoavatar.h"

// library includes
#include "llavatarnamecache.h"
#include "llcorehttputil.h"
#include "llhttpnode.h"
#include "llnotificationsutil.h"
#include "llui.h"					// getLanguage()

namespace LLViewerDisplayName
{
	// Fired when viewer receives server response to display name change
	set_name_signal_t sSetDisplayNameSignal;

	// Fired when there is a change in the agent's name
	name_changed_signal_t sNameChangedSignal;

	boost::signals2::connection addNameChangedCallback(const name_changed_signal_t::slot_type& cb) 
	{ 
		return sNameChangedSignal.connect(cb);
	}

	void doNothing() { }
}

void setDisplayNameCoro(const LLSD change_array, const std::string url)
{
    using namespace LLCoreHttpUtil;
    
    LLCore::HttpRequest::policy_t httpPolicy(LLCore::HttpRequest::DEFAULT_POLICY_ID);
    HttpCoroutineAdapter::ptr_t httpAdapter(new HttpCoroutineAdapter("LLViewerDisplayName::set", httpPolicy));
    LLCore::HttpRequest::ptr_t httpRequest(new LLCore::HttpRequest);
    LLCore::HttpOptions::ptr_t httpOpts(new LLCore::HttpOptions);
    LLCore::HttpHeaders::ptr_t httpHeaders(new LLCore::HttpHeaders);
    
    // People API can return localized error messages.  Indicate our
    // language preference via header.
    httpHeaders->append(HTTP_OUT_HEADER_ACCEPT_LANGUAGE, LLUI::getLanguage());
    
    LL_INFOS() << "Set name POST to " << url << LL_ENDL;
    
    LLSD body;
    body["display_name"] = change_array;
    
    // POST the requested change.  The sim will not send a response back to
    // this request directly, rather it will send a separate message after it
    // communicates with the back-end, so we will only be checking for an error.
    LLSD result = httpAdapter->postAndSuspend(httpRequest, url, body, httpOpts, httpHeaders);
    
    LLSD httpResults = result[HttpCoroutineAdapter::HTTP_RESULTS];
    LLCore::HttpStatus status = HttpCoroutineAdapter::getStatusFromLLSD(httpResults);
    if (!status)
    {
        LLViewerDisplayName::sSetDisplayNameSignal(false, LLStringUtil::null, LLSD());
        LLViewerDisplayName::sSetDisplayNameSignal.disconnect_all_slots();
    }
}

void LLViewerDisplayName::set(const std::string& display_name, const set_name_slot_t& slot)
{
	LLViewerRegion* region = gAgent.getRegion();
	llassert(region);
	std::string cap_url = region->getCapability("SetDisplayName");
	if (cap_url.empty())
	{
		// this server does not support display names, report error
		slot(false, "unsupported", LLSD());
		return;
	}

	// People API requires both the old and new value to change a variable.
	// Our display name will be in cache before the viewer's UI is available
	// to request a change, so we can use direct lookup without callback.
	LLAvatarName av_name;
	if (!LLAvatarNameCache::get(gAgent.getID(), &av_name))
	{
		slot(false, "name unavailable", LLSD());
		return;
	}
    
    // People API expects array of [ "old value", "new value" ]
    LLSD change_array = LLSD::emptyArray();
    change_array.append(av_name.getDisplayName());
    change_array.append(display_name);
    
    // Record our caller for when the server sends back a reply
    sSetDisplayNameSignal.connect(slot);
    
    setDisplayNameCoro(change_array, cap_url);
}

class LLSetDisplayNameReply : public LLHTTPNode
{
	LOG_CLASS(LLSetDisplayNameReply);
public:
	/*virtual*/ void post(
		LLHTTPNode::ResponsePtr response,
		const LLSD& context,
		const LLSD& input) const
	{
		LLSD body = input["body"];

		S32 status = body["status"].asInteger();
		bool success = (status == HTTP_OK);
		std::string reason = body["reason"].asString();
		LLSD content = body["content"];

		LL_INFOS() << "status " << status << " reason " << reason << LL_ENDL;

		// If viewer's concept of display name is out-of-date, the set request
		// will fail with 409 Conflict.  If that happens, fetch up-to-date
		// name information.
		if (status == HTTP_CONFLICT)
		{
			LLUUID agent_id = gAgent.getID();
			// Flush stale data
			LLAvatarNameCache::erase( agent_id );
			// Queue request for new data: nothing to do on callback though...
			// Note: no need to disconnect the callback as it never gets out of scope
			LLAvatarNameCache::get(agent_id, boost::bind(&LLViewerDisplayName::doNothing));
			// Kill name tag, as it is wrong
			LLVOAvatar::invalidateNameTag( agent_id );
		}

		// inform caller of result
		LLViewerDisplayName::sSetDisplayNameSignal(success, reason, content);
		LLViewerDisplayName::sSetDisplayNameSignal.disconnect_all_slots();
	}
};


class LLDisplayNameUpdate : public LLHTTPNode
{
	/*virtual*/ void post(
		LLHTTPNode::ResponsePtr response,
		const LLSD& context,
		const LLSD& input) const
	{
		LLSD body = input["body"];
		LLUUID agent_id = body["agent_id"];
		std::string old_display_name = body["old_display_name"];
		// By convention this record is called "agent" in the People API
		LLSD name_data = body["agent"];

		// Inject the new name data into cache
		LLAvatarName av_name;
		av_name.fromLLSD( name_data );

		LL_INFOS() << "name-update now " << LLDate::now()
			<< " next_update " << LLDate(av_name.mNextUpdate)
			<< LL_ENDL;

		// Name expiration time may be provided in headers, or we may use a
		// default value
		// *TODO: get actual headers out of ResponsePtr
		//LLSD headers = response->mHeaders;
		LLSD headers;
		av_name.mExpires = 
			LLAvatarNameCache::nameExpirationFromHeaders(headers);

		LLAvatarNameCache::insert(agent_id, av_name);

		// force name tag to update
		LLVOAvatar::invalidateNameTag(agent_id);

		LLSD args;
		args["OLD_NAME"] = old_display_name;
		args["SLID"] = av_name.getUserName();
		args["NEW_NAME"] = av_name.getDisplayName();
		LLNotificationsUtil::add("DisplayNameUpdate", args);
		if (agent_id == gAgent.getID())
		{
			LLViewerDisplayName::sNameChangedSignal();
		}
	}
};

LLHTTPRegistration<LLSetDisplayNameReply>
    gHTTPRegistrationMessageSetDisplayNameReply(
		"/message/SetDisplayNameReply");

LLHTTPRegistration<LLDisplayNameUpdate>
    gHTTPRegistrationMessageDisplayNameUpdate(
		"/message/DisplayNameUpdate");
