// © 2020 and later: Unicode, Inc. and others.

// License & terms of use: http://www.unicode.org/copyright.html

#include "unicode/utypes.h"

#if !UCONFIG_NO_FORMATTING

#include "number_usageprefs.h"

#include "cstring.h"

#include "number_decimalquantity.h"

#include "number_microprops.h"

#include "number_roundingutils.h"

#include "number_skeletons.h"

#include "unicode/char16ptr.h"

#include "unicode/currunit.h"

#include "unicode/fmtable.h"

#include "unicode/measure.h"

#include "unicode/numberformatter.h"

#include "unicode/platform.h"

#include "unicode/unum.h"

#include "unicode/urename.h"

#include "units_data.h"

using namespace icu;

using namespace icu::number;

using namespace icu::number::impl;

using icu::StringSegment;

using icu::units::ConversionRates;

// Copy constructor

StringProp::StringProp(const StringProp &other) : StringProp() {

    this->operator=(other);

}

// Copy assignment operator

StringProp &StringProp::operator=(const StringProp &other) {

    if (this == &other) { return *this; }  // self-assignment: no-op

    fLength = 0;

    fError = other.fError;

    if (fValue != nullptr) {

        uprv_free(fValue);

        fValue = nullptr;

    }

    if (other.fValue == nullptr) {

        return *this;

    }

    if (U_FAILURE(other.fError)) {

        // We don't bother trying to allocating memory if we're in any case busy

        // copying an errored StringProp.

        return *this;

    }

    fValue = (char *)uprv_malloc(other.fLength + 1);

    if (fValue == nullptr) {

        fError = U_MEMORY_ALLOCATION_ERROR;

        return *this;

    }

    fLength = other.fLength;

    uprv_strncpy(fValue, other.fValue, fLength + 1);

    return *this;

}

// Move constructor

StringProp::StringProp(StringProp &&src) noexcept : fValue(src.fValue),

                                                      fLength(src.fLength),

                                                      fError(src.fError) {

    // Take ownership away from src if necessary

    src.fValue = nullptr;

}

// Move assignment operator

StringProp &StringProp::operator=(StringProp &&src) noexcept {

    if (this == &src) {

        return *this;

    }

    if (fValue != nullptr) {

        uprv_free(fValue);

    }

    fValue = src.fValue;

    fLength = src.fLength;

    fError = src.fError;

    // Take ownership away from src if necessary

    src.fValue = nullptr;

    return *this;

}

StringProp::~StringProp() {

    if (fValue != nullptr) {

        uprv_free(fValue);

        fValue = nullptr;

    }

}

void StringProp::set(StringPiece value) {

    if (fValue != nullptr) {

        uprv_free(fValue);

        fValue = nullptr;

    }

    fLength = value.length();

    fValue = (char *)uprv_malloc(fLength + 1);

    if (fValue == nullptr) {

        fLength = 0;

        fError = U_MEMORY_ALLOCATION_ERROR;

        return;

    }

    if (fLength > 0) {

        uprv_strncpy(fValue, value.data(), fLength);

    }

    fValue[fLength] = 0;

}

// Populates micros.mixedMeasures and modifies quantity, based on the values in

// measures.

void mixedMeasuresToMicros(const MaybeStackVector<Measure> &measures, DecimalQuantity *quantity,

                           MicroProps *micros, UErrorCode status) {

    micros->mixedMeasuresCount = measures.length();

    if (micros->mixedMeasures.getCapacity() < micros->mixedMeasuresCount) {

        if (micros->mixedMeasures.resize(micros->mixedMeasuresCount) == nullptr) {

            status = U_MEMORY_ALLOCATION_ERROR;

            return;

        }

    }

    for (int32_t i = 0; i < micros->mixedMeasuresCount; i++) {

        switch (measures[i]->getNumber().getType()) {

        case Formattable::kInt64:

            micros->mixedMeasures[i] = measures[i]->getNumber().getInt64();

            break;

        case Formattable::kDouble:

            U_ASSERT(micros->indexOfQuantity < 0);

            quantity->setToDouble(measures[i]->getNumber().getDouble());

            micros->indexOfQuantity = i;

            break;

        default:

            U_ASSERT(0 == "Found a Measure Number which is neither a double nor an int");

            UPRV_UNREACHABLE_EXIT;

            break;

        }

        if (U_FAILURE(status)) {

            return;

        }

    }

    if (micros->indexOfQuantity < 0) {

        // There is no quantity.

        status = U_INTERNAL_PROGRAM_ERROR;

    }

}

UsagePrefsHandler::UsagePrefsHandler(const Locale &locale,

                                     const MeasureUnit &inputUnit,

                                     const StringPiece usage,

                                     const MicroPropsGenerator *parent,

                                     UErrorCode &status)

    : fUnitsRouter(inputUnit, locale, usage, status),

      fParent(parent) {

}

void UsagePrefsHandler::processQuantity(DecimalQuantity &quantity, MicroProps &micros,

                                        UErrorCode &status) const {

    fParent->processQuantity(quantity, micros, status);

    if (U_FAILURE(status)) {

        return;

    }

    quantity.roundToInfinity(); // Enables toDouble

    const units::RouteResult routed = fUnitsRouter.route(quantity.toDouble(), &micros.rounder, status);

    if (U_FAILURE(status)) {

        return;

    }

    const MaybeStackVector<Measure>& routedMeasures = routed.measures;

    micros.outputUnit = routed.outputUnit.copy(status).build(status);

    if (U_FAILURE(status)) {

        return;

    }

    mixedMeasuresToMicros(routedMeasures, &quantity, &micros, status);

}

UnitConversionHandler::UnitConversionHandler(const MeasureUnit &targetUnit,

                                             const MicroPropsGenerator *parent, UErrorCode &status)

    : fOutputUnit(targetUnit), fParent(parent) {

    MeasureUnitImpl tempInput, tempOutput;

    ConversionRates conversionRates(status);

    if (U_FAILURE(status)) {

        return;

    }

    const MeasureUnitImpl &targetUnitImpl =

        MeasureUnitImpl::forMeasureUnit(targetUnit, tempOutput, status);

    fUnitConverter.adoptInsteadAndCheckErrorCode(

        new ComplexUnitsConverter(targetUnitImpl, conversionRates, status), status);

}

void UnitConversionHandler::processQuantity(DecimalQuantity &quantity, MicroProps &micros,

                                            UErrorCode &status) const {

    fParent->processQuantity(quantity, micros, status);

    if (U_FAILURE(status)) {

        return;

    }

    quantity.roundToInfinity(); // Enables toDouble

    MaybeStackVector<Measure> measures =

        fUnitConverter->convert(quantity.toDouble(), &micros.rounder, status);

    micros.outputUnit = fOutputUnit;

    if (U_FAILURE(status)) {

        return;

    }

    mixedMeasuresToMicros(measures, &quantity, &micros, status);

}

#endif /* #if !UCONFIG_NO_FORMATTING */