#include "LedDeviceFadeCandy.h"

// https://docs.microsoft.com/en-us/windows/win32/winprog/windows-data-types#ssize-t
#if defined(_MSC_VER)
#include <BaseTsd.h>
typedef SSIZE_T ssize_t;
#endif

static const signed   MAX_NUM_LEDS    = 10000; // OPC can handle 21845 leds - in theory, fadecandy device should handle 10000 leds
static const unsigned OPC_SET_PIXELS  = 0;     // OPC command codes
static const unsigned OPC_SYS_EX      = 255;     // OPC command codes
static const unsigned OPC_HEADER_SIZE = 4;     // OPC header size

LedDeviceFadeCandy::LedDeviceFadeCandy(const QJsonObject &deviceConfig)
	: LedDevice()
	, _client(nullptr)
{
	_devConfig = deviceConfig;
	_deviceReady = false;
}

LedDeviceFadeCandy::~LedDeviceFadeCandy()
{
	_client->deleteLater();
}

LedDevice* LedDeviceFadeCandy::construct(const QJsonObject &deviceConfig)
{
	return new LedDeviceFadeCandy(deviceConfig);
}

bool LedDeviceFadeCandy::init(const QJsonObject &deviceConfig)
{
	bool isInitOK = LedDevice::init(deviceConfig);

	if ( isInitOK )
	{
		if (_ledCount > MAX_NUM_LEDS)
		{
			//Error(_log, "fadecandy/opc: Invalid attempt to write led values. Not more than %d leds are allowed.", MAX_NUM_LEDS);
			QString errortext = QString ("More LED configured than allowed (%1)").arg(MAX_NUM_LEDS);
			this->setInError(errortext);
			isInitOK = false;
		}
		else
		{
			_host        = deviceConfig["output"].toString("127.0.0.1");
			_port        = deviceConfig["port"].toInt(7890);
			_channel     = deviceConfig["channel"].toInt(0);
			_gamma       = deviceConfig["gamma"].toDouble(1.0);
			_noDither    = ! deviceConfig["dither"].toBool(false);
			_noInterp    = ! deviceConfig["interpolation"].toBool(false);
			_manualLED   = deviceConfig["manualLed"].toBool(false);
			_ledOnOff    = deviceConfig["ledOn"].toBool(false);
			_setFcConfig = deviceConfig["setFcConfig"].toBool(false);

			_whitePoint_r = 1.0;
			_whitePoint_g = 1.0;
			_whitePoint_b = 1.0;

			const QJsonArray whitePointConfig = deviceConfig["whitePoint"].toArray();
			if ( !whitePointConfig.isEmpty() && whitePointConfig.size() == 3 )
			{
				_whitePoint_r = whitePointConfig[0].toDouble() / 255.0;
				_whitePoint_g = whitePointConfig[1].toDouble() / 255.0;
				_whitePoint_b = whitePointConfig[2].toDouble() / 255.0;
			}

			_opc_data.resize( _ledRGBCount + OPC_HEADER_SIZE );
			_opc_data[0] = _channel;
			_opc_data[1] = OPC_SET_PIXELS;
			_opc_data[2] = _ledRGBCount >> 8;
			_opc_data[3] = _ledRGBCount & 0xff;
		}
	}
	return isInitOK;
}

bool LedDeviceFadeCandy::initNetwork()
{
	bool isInitOK = true;

	// TODO: Add Network-Error handling
	_client = new QTcpSocket(this);
	return isInitOK;
}

int LedDeviceFadeCandy::open()
{
	int retval = -1;
	_deviceReady = false;

	if ( init(_devConfig) )
	{
		if ( !initNetwork() )
		{
			this->setInError( "Network error!" );
		}
		else
		{
			_deviceReady = true;
			setEnable(true);
			retval = 0;
		}
	}
	return retval;
}

void LedDeviceFadeCandy::close()
{
	LedDevice::close();

	// LedDevice specific closing activites
	_client->close();
}


bool LedDeviceFadeCandy::isConnected()
{
	return _client->state() == QAbstractSocket::ConnectedState;
}

bool LedDeviceFadeCandy::tryConnect()
{
	if (  _client->state() == QAbstractSocket::UnconnectedState ) {
		_client->connectToHost( _host, _port);
		if ( _client->waitForConnected(1000) )
		{
			Info(_log,"fadecandy/opc: connected to %s:%i on channel %i", QSTRING_CSTR(_host), _port, _channel);
			if (_setFcConfig)
			{
				sendFadeCandyConfiguration();
			}
		}
	}

	return isConnected();
}

int LedDeviceFadeCandy::write( const std::vector<ColorRgb> & ledValues )
{
	uint idx = OPC_HEADER_SIZE;
	for (const ColorRgb& color : ledValues)
	{
		_opc_data[idx  ] = unsigned( color.red   );
		_opc_data[idx+1] = unsigned( color.green );
		_opc_data[idx+2] = unsigned( color.blue  );
		idx += 3;
	}

	return ( transferData()<0 ? -1 : 0 );
}

int LedDeviceFadeCandy::transferData()
{
	if (LedDevice::enabled())
		if ( isConnected() || tryConnect() )
			return _client->write( _opc_data, _opc_data.size() );

	return -2;
}

int LedDeviceFadeCandy::sendSysEx(uint8_t systemId, uint8_t commandId, QByteArray msg)
{
	if ( isConnected() )
	{
		QByteArray sysExData;
		uint data_size = msg.size() + 4;
		sysExData.resize( 4 + OPC_HEADER_SIZE );

		sysExData[0] = 0;
		sysExData[1] = OPC_SYS_EX;
		sysExData[2] = data_size >>8;
		sysExData[3] = data_size &0xff;
		sysExData[4] = systemId >>8;
		sysExData[5] = systemId &0xff;
		sysExData[6] = commandId >>8;
		sysExData[7] = commandId &0xff;

		sysExData += msg;

		return _client->write( sysExData, sysExData.size() );
	}
	return -1;
}

void LedDeviceFadeCandy::sendFadeCandyConfiguration()
{
	Debug(_log, "send configuration to fadecandy");
	QString data = "{\"gamma\": "+QString::number(_gamma,'g',4)+", \"whitepoint\": ["+QString::number(_whitePoint_r,'g',4)+", "+QString::number(_whitePoint_g,'g',4)+", "+QString::number(_whitePoint_b,'g',4)+"]}";
	sendSysEx(1, 1, data.toLocal8Bit() );

	char firmware_data = ((uint8_t)_noDither | ((uint8_t)_noInterp << 1) | ((uint8_t)_manualLED << 2) | ((uint8_t)_ledOnOff << 3) );
	sendSysEx(1, 2, QByteArray(1,firmware_data) );
}