/**
 * @file NbusBridge.cpp
 * @brief Implemetnácia modulu nBus Brige
 * @date Mar 7, 2025
 * @author Juraj Dudak
 */

#include "NbusBridge.h"

static uint8_t const crc8x_table[] = {
    0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15, 0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D, 0x70, 0x77, 0x7E,
    0x79, 0x6C, 0x6B, 0x62, 0x65, 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D, 0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB,
    0xF2, 0xF5, 0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD, 0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, 0xA8,
    0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD, 0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2, 0xFF, 0xF8, 0xF1, 0xF6,
    0xE3, 0xE4, 0xED, 0xEA, 0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2, 0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D,
    0x9A, 0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32, 0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A, 0x57, 0x50,
    0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42, 0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A, 0x89, 0x8E, 0x87, 0x80, 0x95,
    0x92, 0x9B, 0x9C, 0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4, 0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,
    0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4, 0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C, 0x51, 0x56, 0x5F,
    0x58, 0x4D, 0x4A, 0x43, 0x44, 0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C, 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A,
    0x33, 0x34, 0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B, 0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63, 0x3E,
    0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B, 0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13, 0xAE, 0xA9, 0xA0, 0xA7,
    0xB2, 0xB5, 0xBC, 0xBB, 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83, 0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC,
    0xCB, 0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3};

static uint8_t crc8x_fast(void const *mem, uint16_t len)
{
    uint8_t crc = 0;
    uint8_t const *data = (uint8_t *)mem;
    if (data == NULL)
        return 0xff;
    crc &= 0xff;
    while (len--)
        crc = crc8x_table[crc ^ *data++];
    return crc;
}

NbusBridge::NbusBridge()
{

    _communicator = NULL;
    _num_slaves = 0;
    _run_state = STATE_STOPPED;
    _pdu.sa = BROADCAST_ADDRESS;
}

void NbusBridge::setCommunicator(NbusCommunicator *nc)
{
    if (nc == NULL)
    {
        while (1)
        {
            __NOP();
        }
    }

    _communicator = nc;
    _num_slaves = 0;
    _run_state = STATE_STOPPED;
    _pdu.sa = BROADCAST_ADDRESS;
    _dataFrame = new DataFrame(_dataPacket, sizeof(_dataPacket), TYPE_RAW, CRC_OFF);
}

NbusBridge::~NbusBridge()
{
    // empty
}

/**
 * Spustí scan internej nbus siete.
 * Posiela requesty pre celý adresný priestor ako ECHO paket.
 * Výsledok je uložený interne. K jednotlivým slave-om sa dá dostať cez metódu getSlave(index), kde 0<=index<num_slaves
 */
void NbusBridge::scan()
{
    _num_slaves = 0;

    DataFrame *frame;
    uint8_t *response;
    Nbus_pdu pdu;
    pdu.fc = FC_ECHO;
    pdu.sa = SLAVE_ADDRESS_MODULE;
    _pdu.ma = SLAVE_ADDRESS_MODULE;
    uint8_t data[4] = {110, 66, 117, 115}; // nBus
    const uint8_t data_offset = 4;
    uint8_t slave_index = 0;

    for (uint32_t i = 1; i < MAX_SLAVES; i++)
    {
        pdu.ma = i;
        frame = _communicator->sendAndReceive(&pdu, data, 4);
        if (!frame->IsEmpty())
        {
            response = frame->GetFrame();
            if (response[0 + data_offset] == 110 && response[1 + data_offset] == 66 &&
                response[2 + data_offset] == 117 && response[3 + data_offset] == 115)
            {
                _num_slaves++;
                _slaves[i].setAddress(i);
                _slaves[i].setCommunicator(_communicator);
                _slave_adress[slave_index++] = i;
            }
        }
    }
}

/**
 * @brief Vráti inštanciu index-teho zdetegovaného nBus slave.
 * @return Smerník na existujúc NbusBridge alebo NULL
 */
NbusSlave *NbusBridge::getSlave(uint8_t index)
{
    if (index >= 0 && index < MAX_SLAVES)
    {
        if (_slaves[index].isActive())
        {
            return &_slaves[index];
        }
    }
    return NULL;
}

/**
 * Vráti počet detegovaných nBus slave modulov na internej zbernici.
 * @return počet nBus slave zariadení.
 */
uint8_t NbusBridge::getNumSlaves()
{
    return _num_slaves;
}

/**
 * Odošle odpoveď uzlu Master (PC)
 */
void NbusBridge::sendResponseToMaster(DataFrame *response_frame)
{
    if (response_frame != NULL && response_frame->IsEmpty() == false)
    {
        _communicator->sendToMaster(response_frame);
    }
}

/**
 * Na internú zbernicu odošle Broadcast request "START"
 */
void NbusBridge::broadcastStart()
{
    _pdu.fc = FC_START;
    _pdu.ma = BROADCAST_ADDRESS;
    _communicator->send(&_pdu, NULL, 0);
    _run_state = STATE_RUNNING;
}

/**
 * Na internú zbernicu odošle Broadcast request "STOP"
 */
void NbusBridge::broadcastStop()
{
    _pdu.fc = FC_STOP;
    _pdu.ma = BROADCAST_ADDRESS;
    _communicator->send(&_pdu, NULL, 0);
    _run_state = STATE_TO_STOP;
}

/**
 * Spracovanie broadcast requestu.
 * Inplementované funkcie:
 * - FC_STOP
 * - FC_START
 */
void NbusBridge::process_broadcast(uint8_t *rxFrame)
{
    switch (FUNCTION_CODE(rxFrame))
    {

    case FC_STOP: /* 2 */
        this->broadcastStop();
        break;

    case FC_START: /* 3 */
        this->broadcastStart();
        break;

    default:; // nothing
    }
}


/**
 * Spracovanie requestu pre bridge.
 * Implementované funkcie:
 * - FC_SLAVES
 * - FC_INFO
 * - FC_ECHO
 */
void NbusBridge::process_bridge_request(uint8_t *rxFrame, uint8_t size)
{
    switch (FUNCTION_CODE(rxFrame))
    {

    case FC_ECHO: 		/* 1 */
    	_frame_nbus_internal = _communicator->formatPacket(rxFrame, size);
        break;

    case FC_INFO: 		/* 0xE => 15 */
    	/*
    	 * verzia
    	 * HW
    	 * HW.verzia
    	 */
    	_frame_nbus_internal->Init();
    	_frame_nbus_internal->AddArray((uint8_t*)BRIDGE_INFO_VERSION, 3);
    	_frame_nbus_internal->AddArray((uint8_t*)BRIDGE_INFO_HW_FAMILY, 3);
    	_frame_nbus_internal->AddArray((uint8_t*)BRIDGE_INFO_HW_VERSION, 3);
    	_frame_nbus_internal->Commit();
        break;

    case FC_SLAVES: 	/* 0x10 => 16 */
        _frame_nbus_internal = getSlavesInfo();
        break;

    default:; // nothing
    }
}

void NbusBridge::process_slave_request(uint8_t *rxFrame, uint8_t size)
{
    uint8_t send_reponse = 1;

    NbusSlave * selected_slave = getSlave(MODULE_ADDRESS(rxFrame));
	if (selected_slave == NULL)
	{
		return;
	}

	if (!selected_slave->isActive())
	{
		return;
	}

    switch (FUNCTION_CODE(rxFrame))
    {

    case FC_FIND: /* 0 */
                  // Not implemented yet
        break;

    case FC_ECHO: /* 1 */
        _frame_nbus_internal = selected_slave->nbus_echo(&rxFrame[3], size - 4);
        break;

    case FC_PARAM: /* 4 */
        if (size == RX_META)
        {
            _frame_nbus_internal = selected_slave->nbus_sensor_parameters(SENSOR_ADDRESS(rxFrame));
        }
        else
        {
            _frame_nbus_internal = selected_slave->nbus_sensor_parameter(SENSOR_ADDRESS(rxFrame), rxFrame[RX_META - 1]);
        }
        break;

    case FC_SENSOR_CNT: /* 5 */
        _frame_nbus_internal = selected_slave->nbus_sensor_count();
        break;

    case FC_SLEEP: /* 6 */
        break;

    case FC_WAKEUP: /* 7 */
        break;

    case FC_CALIBRATE: /* 8 */
        break;

    case FC_RESET: /* 9 */
        break;

    case FC_STORE: /* 0xA => 10 */
        break;

    case FC_DATA: /* 0xB => 11 */
        // NO NEED TO IMPLEMENT on NBUS BRIDGE
        break;

    case FC_SYNC: /* 0xC => 12 */
        break;

    case FC_SENSOR_TYPE: /* 0xD => 13 */
        _frame_nbus_internal = selected_slave->nbus_sensor_type(SENSOR_ADDRESS(rxFrame));
        break;

    case FC_INFO: /* 0xE => 14 */
        _frame_nbus_internal = selected_slave->nbus_module_info();
        break;

    case FC_SENSOR_FORMAT: /* 0xF => 15 */
        _frame_nbus_internal = selected_slave->nbus_sensor_format(SENSOR_ADDRESS(rxFrame));
        break;

    default:
        send_reponse = 0;
    }

    if (send_reponse == 1)
    {
        sendResponseToMaster(_frame_nbus_internal);
    }
}

/**
 * Pripraví informáciu o všetkcýh nBus slave moduloch
 */
DataFrame *NbusBridge::getSlavesInfo()
{
    return _communicator->formatSlaveInfo(_slave_adress, _num_slaves);
}

/**
 * Implementácia rozhrania nBus.
 */
void NbusBridge::processRequest(uint8_t *rxFrame, uint8_t size)
{
    uint8_t crcC = crc8x_fast(rxFrame, size - 1);

    if (crcC != rxFrame[size - 1])
    {
        return;
    }

    if (MODULE_ADDRESS(rxFrame) == BROADCAST_ADDRESS)
    {
    	if (SENSOR_ADDRESS(rxFrame) == BRIDGE_ADDRESS) {
    		process_bridge_request(rxFrame, size);
    		sendResponseToMaster(_frame_nbus_internal);
    	} else {
    		process_broadcast(rxFrame);
    	}

    } else {
    	process_slave_request(rxFrame, size);
    }

}

/**
 * Implementácia stavu STATE_RUNNING.
 * V tomto stave je spustené automatické odčítanie údajov zo všetkých slave/všetkých senzorov.
 * Dáta sa v dávke (za všetky slavy) odosielajú na Master.
 */
void NbusBridge::processRunningState()
{

    if (_run_state == STATE_STOPPED)
    {
        return;
    }

    if (_run_state == STATE_TO_STOP)
    {
        HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3, GPIO_PIN_RESET);
        _run_state = STATE_STOPPED;
        return;
    }

    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3, GPIO_PIN_SET);
    NbusSlave *slave = NULL;
    uint8_t *slaveFrameResponse;
    _dataFrame->Init();
    _dataFrame->AddHeader(TYPE_HEADER_2B);
    _dataFrame->AddInt32(HAL_GetTick());

    for (uint32_t i = 0; i < _num_slaves; i++)
    {
        slave = getSlave(_slave_adress[i]);
        if (slave != NULL && slave->isActive())
        {
            for (uint32_t k = 1; k <= slave->nbus_get_sensor_count(false); k++)
            {
                _dataFrame->AddInt8(slave->getModuleAddress());
                _workerFrame = slave->nbus_sensor_getData(k);
                slaveFrameResponse = _workerFrame->GetFrame();
                _dataFrame->AddInt8(slave->getSensorAddress());
                _dataFrame->AddArray(&slaveFrameResponse[3], _workerFrame->GetLength() - 3);
            }
        }
    }

    _dataFrame->AddInt8(0xFF);
    _dataFrame->AddInt8(0xFF);
    _dataFrame->Commit();
    // TODO problem: v stavi RUNNING pride STOP prikaz, ale ten sa nespracuje, pretoze bezi obsluha tejto funkcie.
    if (_run_state == STATE_RUNNING)
    {
        sendResponseToMaster(_dataFrame);
    }

    /// TODO toto sa MI NEPACI, TREBA VYRIESIT INAK!!!!!!
    HAL_Delay(50); // TREBA VYSKUSAT
}