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#include "modbusdatautils.h"

#include <QDataStream>

ModbusDataUtils::ModbusDataUtils()
{

}

quint16 ModbusDataUtils::convertToUInt16(const QVector<quint16> &registers)
{
    Q_ASSERT_X(registers.count() == 1,  "ModbusDataUtils", "invalid raw data size for converting value to quint16");
    return registers.at(0);
}

qint16 ModbusDataUtils::convertToInt16(const QVector<quint16> &registers)
{
    Q_ASSERT_X(registers.count() == 1,  "ModbusDataUtils", "invalid raw data size for converting value to qint16");
    return static_cast<qint16>(registers.at(0));
}

quint32 ModbusDataUtils::convertToUInt32(const QVector<quint16> &registers, ByteOrder byteOrder)
{
    Q_ASSERT_X(registers.count() == 2,  "ModbusDataUtils", "invalid raw data size for converting value to quint32");
    QByteArray data;
    QDataStream inputStream(&data, QIODevice::WriteOnly);
    if (byteOrder == ByteOrderBigEndian) {
        inputStream << registers.at(0);
        inputStream << registers.at(1);
    } else {
        inputStream << registers.at(1);
        inputStream << registers.at(0);
    }

    QDataStream outputStream(&data, QIODevice::ReadOnly);
    quint32 result = 0;
    outputStream >> result;
    return result;
}

qint32 ModbusDataUtils::convertToInt32(const QVector<quint16> &registers, ByteOrder byteOrder)
{
    Q_ASSERT_X(registers.count() == 2,  "ModbusDataUtils", "invalid raw data size for converting value to quint32");
    QByteArray data;
    QDataStream inputStream(&data, QIODevice::WriteOnly);
    if (byteOrder == ByteOrderBigEndian) {
        inputStream << registers.at(0);
        inputStream << registers.at(1);
    } else {
        inputStream << registers.at(1);
        inputStream << registers.at(0);
    }

    QDataStream outputStream(&data, QIODevice::ReadOnly);
    qint32 result = 0;
    outputStream >> result;
    return result;
}

quint64 ModbusDataUtils::convertToUInt64(const QVector<quint16> &registers, ByteOrder byteOrder)
{
    Q_ASSERT_X(registers.count() == 4,  "ModbusDataUtils", "invalid raw data size for converting value to quint64");
    QByteArray data;
    QDataStream inputStream(&data, QIODevice::WriteOnly);
    if (byteOrder == ByteOrderBigEndian) {
        inputStream << registers.at(0);
        inputStream << registers.at(1);
        inputStream << registers.at(2);
        inputStream << registers.at(3);
    } else {
        inputStream << registers.at(3);
        inputStream << registers.at(2);
        inputStream << registers.at(1);
        inputStream << registers.at(0);
    }

    QDataStream outputStream(&data, QIODevice::ReadOnly);
    quint64 result = 0;
    outputStream >> result;
    return result;
}

qint64 ModbusDataUtils::convertToInt64(const QVector<quint16> &registers, ByteOrder byteOrder)
{
    Q_ASSERT_X(registers.count() == 4,  "ModbusDataUtils", "invalid raw data size for converting value to qint64");
    QByteArray data;
    QDataStream inputStream(&data, QIODevice::WriteOnly);
    if (byteOrder == ByteOrderBigEndian) {
        inputStream << registers.at(0);
        inputStream << registers.at(1);
        inputStream << registers.at(2);
        inputStream << registers.at(3);
    } else {
        inputStream << registers.at(3);
        inputStream << registers.at(2);
        inputStream << registers.at(1);
        inputStream << registers.at(0);
    }

    QDataStream outputStream(&data, QIODevice::ReadOnly);
    qint64 result = 0;
    outputStream >> result;
    return result;
}

QString ModbusDataUtils::convertToString(const QVector<quint16> &registers, ByteOrder characterByteOrder)
{
    QByteArray bytes;
    QDataStream stream(&bytes, QIODevice::WriteOnly);
    // Note: some devices use little endian within the register uint16 representation of the 2 characters.
    stream.setByteOrder(characterByteOrder == ByteOrderBigEndian ? QDataStream::BigEndian : QDataStream::LittleEndian);
    for (int i = 0; i < registers.count(); i++) {
        stream << registers.at(i);
    }

    return QString::fromUtf8(bytes).trimmed();
}

float ModbusDataUtils::convertToFloat32(const QVector<quint16> &registers, ByteOrder byteOrder)
{
    Q_ASSERT_X(registers.count() == 2,  "ModbusDataUtils", "invalid raw data size for converting value to float32");
    quint32 rawValue = ModbusDataUtils::convertToUInt32(registers, byteOrder);
    float value = 0;
    memcpy(&value, &rawValue, sizeof(quint32));
    return value;
}

double ModbusDataUtils::convertToFloat64(const QVector<quint16> &registers, ByteOrder byteOrder)
{

    Q_ASSERT_X(registers.count() == 4,  "ModbusDataUtils", "invalid raw data size for converting value to float64");
    quint64 rawValue = ModbusDataUtils::convertToUInt64(registers, byteOrder);
    double value = 0;
    memcpy(&value, &rawValue, sizeof(quint64));
    return value;
}

QVector<quint16> ModbusDataUtils::convertFromUInt16(quint16 value)
{
    return QVector<quint16>() << value;
}

QVector<quint16> ModbusDataUtils::convertFromInt16(qint16 value)
{
    return ModbusDataUtils::convertFromUInt16(static_cast<quint16>(value));
}

QVector<quint16> ModbusDataUtils::convertFromUInt32(quint32 value, ByteOrder byteOrder)
{
    QByteArray data;
    QDataStream inputStream(&data, QIODevice::WriteOnly);
    inputStream << value;

    QDataStream outputStream(&data, QIODevice::ReadOnly);
    QVector<quint16> values;
    for (int i = 0; i < 2; i++) {
        quint16 registerValue = 0;
        outputStream >> registerValue;
        if (byteOrder == ByteOrderBigEndian) {
            values.append(registerValue);
        } else {
            values.prepend(registerValue);
        }
    }

    return values;
}

QVector<quint16> ModbusDataUtils::convertFromInt32(qint32 value, ByteOrder byteOrder)
{
    return ModbusDataUtils::convertFromUInt32(static_cast<quint32>(value), byteOrder);
}

QVector<quint16> ModbusDataUtils::convertFromUInt64(quint64 value, ByteOrder byteOrder)
{
    QByteArray data;
    QDataStream inputStream(&data, QIODevice::WriteOnly);
    inputStream << value;

    QDataStream outputStream(&data, QIODevice::ReadOnly);
    QVector<quint16> values;
    for (int i = 0; i < 4; i++) {
        quint16 registerValue = 0;
        outputStream >> registerValue;
        if (byteOrder == ByteOrderBigEndian) {
            values.append(registerValue);
        } else {
            values.prepend(registerValue);
        }
    }
    return values;
}

QVector<quint16> ModbusDataUtils::convertFromInt64(qint64 value, ByteOrder byteOrder)
{
    QByteArray data;
    QDataStream inputStream(&data, QIODevice::WriteOnly);
    inputStream << value;

    QDataStream outputStream(&data, QIODevice::ReadOnly);
    QVector<quint16> values;
    for (int i = 0; i < 4; i++) {
        quint16 registerValue = 0;
        outputStream >> registerValue;
        if (byteOrder == ByteOrderBigEndian) {
            values.append(registerValue);
        } else {
            values.prepend(registerValue);
        }
    }
    return values;
}

QVector<quint16> ModbusDataUtils::convertFromString(const QString &value, quint16 stringLength, ByteOrder characterByteOrder)
{
    Q_ASSERT_X(value.length() <= stringLength, "ModbusDataUtils", "cannot convert a string which is bigger than the desired register vector.");
    QByteArray data = value.toLatin1() + QByteArray('\0', stringLength - value.count());
    QDataStream stream(&data, QIODevice::ReadOnly);
    // Note: some devices use little endian within the register uint16 representation of the 2 characters.
    stream.setByteOrder(characterByteOrder == ByteOrderBigEndian ? QDataStream::BigEndian : QDataStream::LittleEndian);
    QVector<quint16> values;
    for (int i = 0; i < stringLength; i++) {
        quint16 registerValue = 0;
        stream >> registerValue;
        values.append(registerValue);
    }
    return values;
}

QVector<quint16> ModbusDataUtils::convertFromFloat32(float value, ByteOrder byteOrder)
{
    quint32 rawValue = 0;
    memcpy(&rawValue, &value, sizeof(float));
    return ModbusDataUtils::convertFromUInt32(rawValue, byteOrder);
}

QVector<quint16> ModbusDataUtils::convertFromFloat64(double value, ByteOrder byteOrder)
{
    quint64 rawValue = 0;
    memcpy(&rawValue, &value, sizeof(double));
    return ModbusDataUtils::convertFromUInt64(rawValue, byteOrder);
}