/* SleepLib Viatom Loader Implementation
 *
 * Copyright (c) 2019 The OSCAR Team (written by dave madden <dhm@mersenne.com>)
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file COPYING in the main directory of the source code
 * for more details. */

//********************************************************************************************
// IMPORTANT!!!
//********************************************************************************************
// Please INCREMENT the viatom_data_version in viatom_loader.h when making changes to this loader
// that change loader behaviour or modify channels.
//********************************************************************************************

#include <QDir>
#include <QTextStream>
#include "viatom_loader.h"
#include "SleepLib/machine.h"

bool
ViatomLoader::Detect(const QString & path)
{
	// I don't know under what circumstances this is called...
	qDebug() << "ViatomLoader::Detect(" << path << ")";
	return true;
}

int
ViatomLoader::Open( const QString & dirpath )
{
	// I don't know under what circumstances this is called...
	qDebug() << "ViatomLoader::Open(" << dirpath << ")";
	return 0;
}

int
ViatomLoader::OpenFile( const QString & filename )
{
	qDebug() << "ViatomLoader::OpenFile(" << filename << ")";

    QFile		 file(filename);

	if (!file.open( QFile::ReadOnly )) {
		qDebug() << "Couldn't open Viatom data file" << filename;
		return 0;
    }

    QByteArray	 data;
    qint64		 filesize = file.size();
	
    data = file.readAll();
	
    QDataStream	 in(data);
    in.setByteOrder(QDataStream::LittleEndian);
	
    quint16		 sig;
	quint16		 Y;
	quint8		 m,d,H,M,S;

	in >> sig >> Y >> m >> d >> H >> M >> S;

	if (sig != 0x0003 ||
		(Y < 2015 || Y > 2040) ||
		(m < 1 || m > 12) ||
		(d < 1 || d > 31) ||
		(         H > 23) ||
		(         M > 60) ||
		(         S > 61)) {
		qDebug( ) << filename << "does not appear to be a Viatom data file";
		return false;
	}

	char      dchr[32];
	sprintf( dchr, "%02u/%02u/%04u %02u:%02u:%02u", m, d, Y, H, M, S );
	
	QDateTime	 data_timestamp = QDateTime::fromString( QString( dchr ), "MM/dd/yyyy HH:mm:ss" );
	quint64		 time_s = data_timestamp.toTime_t( );
	quint64		 time_ms = time_s * 1000L;
	SessionID	 sid = time_s;

	qDebug( ) << filename << "looks like a Viatom file, size" << filesize << "bytes signature" << sig
			  << "start date/time" << data_timestamp << "(" << time_ms << ")";

    in.skipRawData( 41 );	// total 50 byte header, not sure what the rest is.

	MachineInfo  info = newInfo( );
	Machine     *mach = p_profile->CreateMachine( info );
	Session     *sess = mach->SessionExists( sid );

	if (!sess) {
		qDebug( ) << "Session at" << data_timestamp << "not found...create new session" << sid;
		sess = new Session( mach, sid );
		sess->really_set_first( time_ms );
	} else {
		qDebug( ) << "Session" << sid << "found...add data to it";
	}

	EventList	*ev_hr = sess->AddEventList( OXI_Pulse, EVL_Waveform,  1.0, 0.0, 0.0, 0.0, 2000.0 );
	EventList	*ev_o2 = sess->AddEventList( OXI_SPO2, EVL_Waveform,   1.0, 0.0, 0.0, 0.0, 2000.0 );
	EventList	*ev_mv = sess->AddEventList( POS_Motion, EVL_Waveform, 1.0, 0.0, 0.0, 0.0, 2000.0 );

    unsigned char o2, hr, x, motion;
    unsigned char o2_ = 99, hr_ = 60, motion_ = 0;
	unsigned n_rec = 0;
	quint64  step = 2000;	// records @ 2000ms (2 sec)

    // Read all Pulse, SPO2 and Motion data
    do {
		in >> o2 >> hr >> x >> motion >> x;

		if (o2 < 50 || o2 > 100) o2 = o2_;
		if (hr < 20 || hr > 200) hr = hr_;
		if (motion > 200) motion = motion_;

		sess->set_last( time_ms );
		ev_hr->AddEvent( time_ms, hr );
		ev_o2->AddEvent( time_ms, o2 );
		ev_mv->AddEvent( time_ms, motion );

		o2_ = o2;
		hr_ = hr;
		motion_ = motion;
		time_ms += step;
		n_rec += 1;
    } while (!in.atEnd());

	qDebug( ) << "Read Viatom data from" << data_timestamp << "to" << (QDateTime::fromSecsSinceEpoch( time_ms / 1000L ))
			  << n_rec << "records"
			  << ev_mv->Min( ) << "<=Motion<=" << ev_mv->Max( );

	sess->setMin( OXI_Pulse,  ev_hr->Min( ) );
	sess->setMax( OXI_Pulse,  ev_hr->Max( ) );
	sess->setMin( OXI_SPO2,   ev_o2->Min( ) );
	sess->setMax( OXI_SPO2,   ev_o2->Max( ) );
	sess->setMin( POS_Motion, ev_mv->Min( ) );
	sess->setMax( POS_Motion, ev_mv->Max( ) );

	sess->really_set_last( time_ms );
	sess->SetChanged( true );
	mach->AddSession( sess );
	mach->Save( );

    return true;
}

static bool viatom_initialized = false;

void
ViatomLoader::Register( )
{
    if (!viatom_initialized) {
		qDebug( "Registering ViatomLoader" );
		RegisterLoader( new ViatomLoader( ) );
		//InitModelMap();
		viatom_initialized = true;
	}
}