/********************************************************************************
* FaceTrackNoIR		This program is a private project of the some enthusiastic	*
*					gamers from Holland, who don't like to pay much for			*
*					head-tracking.												*
*																				*
* Copyright (C) 2010-2011	Wim Vriend (Developing)								*
*							Ron Hendriks (Researching and Testing)				*
*																				*
* Homepage																		*
*																				*
* This program 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; either version 3 of the License, or (at your		*
* option) any later version.													*
*																				*
* 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/>.				*
*																				*
* FSUIPCServer		FSUIPCServer is the Class, that communicates headpose-data	*
*					to games, using the FSUIPC.dll.			         			*
********************************************************************************/
/*
	Modifications (last one on top):
	20110401 - WVR: Moved protocol to a DLL, convenient for installation etc.
	20101224 - WVR: Base class is no longer inheriting QThread. sendHeadposeToGame
					is called from run() of Tracker.cpp
*/
#include "ftnoir_protocol_fsuipc.h"
#include "facetracknoir/global-settings.h"

/** constructor **/
FTNoIR_Protocol::FTNoIR_Protocol()
{
	loadSettings();
	ProgramName = "Microsoft FS2004";

	prevPosX = 0.0f;
	prevPosY = 0.0f;
	prevPosZ = 0.0f;
	prevRotX = 0.0f;
	prevRotY = 0.0f;
	prevRotZ = 0.0f;
}

/** destructor **/
FTNoIR_Protocol::~FTNoIR_Protocol()
{
	//
	// Free the DLL
	//
	FSUIPCLib.unload();
}

//
// Scale the measured value to the Joystick values
//
int FTNoIR_Protocol::scale2AnalogLimits( float x, float min_x, float max_x ) {
double y;
double local_x;
	
	local_x = x;
	if (local_x > max_x) {
		local_x = max_x;
	}
	if (local_x < min_x) {
		local_x = min_x;
	}
	y = ( 16383 * local_x ) / max_x;

	return (int) y;
}

//
// Load the current Settings from the currently 'active' INI-file.
//
void FTNoIR_Protocol::loadSettings() {
	QSettings settings("opentrack");	// Registry settings (in HK_USER)

	QString currentFile = settings.value ( "SettingsFile", QCoreApplication::applicationDirPath() + "/Settings/default.ini" ).toString();
	QSettings iniFile( currentFile, QSettings::IniFormat );		// Application settings (in INI-file)

	iniFile.beginGroup ( "FSUIPC" );
	LocationOfDLL = iniFile.value ( "LocationOfDLL", FSUIPC_FILENAME ).toString();
	qDebug() << "FSUIPCServer::loadSettings() says: Location of DLL = " << LocationOfDLL;
	iniFile.endGroup ();
}

//
// Update Headpose in Game.
//
void FTNoIR_Protocol::sendHeadposeToGame(double *headpose, double *rawheadpose ) {
DWORD result;
TFSState pitch;
TFSState yaw;
TFSState roll;
WORD FSZoom;

float virtPosX;
float virtPosY;
float virtPosZ;

float virtRotX;
float virtRotY;
float virtRotZ;

//	qDebug() << "FSUIPCServer::run() says: started!";

    virtRotX = -headpose[RY];				// degrees
    virtRotY = headpose[RX];
    virtRotZ = headpose[RZ];

	virtPosX = 0.0f;											// cm, X and Y are not working for FS2002/2004!
	virtPosY = 0.0f;
    virtPosZ = headpose[TZ];

	//
	// Init. the FSUIPC offsets (derived from Free-track...)
	//
	pitch.Control = 66503;
	yaw.Control = 66504;
	roll.Control = 66505;

	//
	// Only do this when the data has changed. This way, the HAT-switch can be used when tracking is OFF.
	//
	if ((prevPosX != virtPosX) || (prevPosY != virtPosY) || (prevPosZ != virtPosZ) ||
		(prevRotX != virtRotX) || (prevRotY != virtRotY) || (prevRotZ != virtRotZ)) {
		//
		// Open the connection
		//
		FSUIPC_Open(SIM_ANY, &result);

		//
		// Check the FS-version
		//
		if  (((result == FSUIPC_ERR_OK) || (result == FSUIPC_ERR_OPEN)) && 
			 ((FSUIPC_FS_Version == SIM_FS2K2) || (FSUIPC_FS_Version == SIM_FS2K4))) {
//			qDebug() << "FSUIPCServer::run() says: FSUIPC opened succesfully";
			//
			// Write the 4! DOF-data to FS. Only rotations and zoom are possible.
			//
			pitch.Value = scale2AnalogLimits(virtRotX, -180, 180);
			FSUIPC_Write(0x3110, 8, &pitch, &result);

			yaw.Value = scale2AnalogLimits(virtRotY, -180, 180);
			FSUIPC_Write(0x3110, 8, &yaw, &result);

			roll.Value = scale2AnalogLimits(virtRotZ, -180, 180);
			FSUIPC_Write(0x3110, 8, &roll, &result);

			FSZoom = (WORD) (64/50) * virtPosZ + 64;
			FSUIPC_Write(0x832E, 2, &FSZoom, &result);

			//
			// Write the data, in one go!
			//
			FSUIPC_Process(&result);
			if (result == FSUIPC_ERR_SENDMSG) {
				FSUIPC_Close();							//timeout (1 second) so assume FS closed
			}
		}
	}

	prevPosX = virtPosX;
	prevPosY = virtPosY;
	prevPosZ = virtPosZ;
	prevRotX = virtRotX;
	prevRotY = virtRotY;
	prevRotZ = virtRotZ;
}

//
// Returns 'true' if all seems OK.
//
bool FTNoIR_Protocol::checkServerInstallationOK()
{   
	qDebug() << "checkServerInstallationOK says: Starting Function";

	//
	// Load the DLL.
	//
    FSUIPCLib.setFileName( LocationOfDLL );
    if (FSUIPCLib.load() != true) {
        qDebug() << "checkServerInstallationOK says: Error loading FSUIPC DLL";
        return false;
    }
    else {
        qDebug() << "checkServerInstallationOK says: FSUIPC DLL loaded.";
    }

	return true;
}

///////////////////////////////////////////////////////////////////////////////
// Factory function that creates instances if the Protocol object.

// Export both decorated and undecorated names.
//   GetProtocol     - Undecorated name, which can be easily used with GetProcAddress
//                Win32 API function.
//   _GetProtocol@0  - Common name decoration for __stdcall functions in C language.
//#pragma comment(linker, "/export:GetProtocol=_GetProtocol@0")

extern "C" FTNOIR_PROTOCOL_BASE_EXPORT FTNoIR_Protocol* CALLING_CONVENTION GetConstructor(void)
{
    return new FTNoIR_Protocol;
}