#include "LedDeviceFadeCandy.h"

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 Json::Value &deviceConfig)
: LedDevice()
{
	setConfig(deviceConfig);
}


LedDeviceFadeCandy::~LedDeviceFadeCandy()
{
	_client.close();
}

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


bool LedDeviceFadeCandy::setConfig(const Json::Value &deviceConfig)
{
	_client.close();

	_host        = deviceConfig.get("output", "127.0.0.1").asString();
	_port        = deviceConfig.get("port", 7890).asInt();
	_channel     = deviceConfig.get("channel", 0).asInt();
	_gamma       = deviceConfig.get("gamma", 1.0).asDouble();
	_noDither    = ! deviceConfig.get("dither", false).asBool();
	_noInterp    = ! deviceConfig.get("interpolation", false).asBool();
	_manualLED   = deviceConfig.get("manualLed", false).asBool();
	_ledOnOff    = deviceConfig.get("ledOn", false).asBool();
	_setFcConfig = deviceConfig.get("setFcConfig", false).asBool();

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

	const Json::Value whitePointConfig = deviceConfig["whitePoint"];
	if ( whitePointConfig.isArray() && whitePointConfig.size() == 3 )
	{
		_whitePoint_r = whitePointConfig[0].asDouble();
		_whitePoint_g = whitePointConfig[1].asDouble();
		_whitePoint_b = whitePointConfig[2].asDouble();
	}

	_opc_data.resize( OPC_HEADER_SIZE );
	_opc_data[0] = _channel;
	_opc_data[1] = OPC_SET_PIXELS;
	_opc_data[2] = 0;
	_opc_data[3] = 0;

	return true;
}

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


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

	return isConnected();
}


int LedDeviceFadeCandy::write( const std::vector<ColorRgb> & ledValues )
{
	ssize_t nrLedValues = ledValues.size();
	ssize_t led_data_size = nrLedValues * 3;    // 3 color bytes
	ssize_t opc_data_size = led_data_size + OPC_HEADER_SIZE;

	if (nrLedValues > MAX_NUM_LEDS)
	{
		Error(_log, "fadecandy/opc: Invalid attempt to write led values. Not more than %d leds are allowed.", MAX_NUM_LEDS);
		return -1;
	}

	if ( opc_data_size != _opc_data.size() )
		_opc_data.resize( opc_data_size );

	_opc_data[2] = led_data_size >> 8;
	_opc_data[3] = led_data_size & 0xff;

	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 ( isConnected() || tryConnect() )
		return _client.write( _opc_data, _opc_data.size() );

	return -2;
}


int LedDeviceFadeCandy::switchOff()
{
	for ( int idx=OPC_HEADER_SIZE; idx < _opc_data.size(); idx++ )
		_opc_data[idx] = 0;

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

int LedDeviceFadeCandy::sendSysEx(uint8_t systemId, uint8_t commandId, QByteArray msg)
{
	if ( isConnected() )
	{
		QByteArray sysExData;
		ssize_t 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) );
}