// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
* Copyright (c) 2004-2014, International Business Machines
* Corporation and others.  All Rights Reserved.
**********************************************************************
* Author: Alan Liu
* Created: April 26, 2004
* Since: ICU 3.0
**********************************************************************
*/
#include "unicode/utypes.h"

#if !UCONFIG_NO_FORMATTING

#include "unicode/currunit.h"
#include "unicode/ustring.h"
#include "cstring.h"
#include "uinvchar.h"
#include "charstr.h"

static constexpr char16_t kDefaultCurrency[] = u"XXX";
static constexpr char kDefaultCurrency8[] = "XXX";

U_NAMESPACE_BEGIN

CurrencyUnit::CurrencyUnit(ConstChar16Ptr _isoCode, UErrorCode& ec) {
    // The constructor always leaves the CurrencyUnit in a valid state (with a 3-character currency code).
    // Note: in ICU4J Currency.getInstance(), we check string length for 3, but in ICU4C we allow a
    // non-NUL-terminated string to be passed as an argument, so it is not possible to check length.
    // However, we allow a NUL-terminated empty string, which should have the same behavior as nullptr.
    // Consider NUL-terminated strings of length 1 or 2 as invalid.
    const char16_t* isoCodeToUse;
    if (U_FAILURE(ec) || _isoCode == nullptr || _isoCode[0] == 0) {
        isoCodeToUse = kDefaultCurrency;
    } else if (_isoCode[1] == 0 || _isoCode[2] == 0) {
        isoCodeToUse = kDefaultCurrency;
        ec = U_ILLEGAL_ARGUMENT_ERROR;
    } else if (!uprv_isInvariantUString(_isoCode, 3)) {
        // TODO: Perform a more strict ASCII check like in ICU4J isAlpha3Code?
        isoCodeToUse = kDefaultCurrency;
        ec = U_INVARIANT_CONVERSION_ERROR;
    } else {
        isoCodeToUse = _isoCode;
    }
    // TODO: Perform uppercasing here like in ICU4J Currency.getInstance()?
    uprv_memcpy(isoCode, isoCodeToUse, sizeof(UChar) * 3);
    isoCode[3] = 0;
    char simpleIsoCode[4];
    u_UCharsToChars(isoCode, simpleIsoCode, 4);
    initCurrency(simpleIsoCode);
}

CurrencyUnit::CurrencyUnit(StringPiece _isoCode, UErrorCode& ec) {
    // Note: unlike the old constructor, reject empty arguments with an error.
    char isoCodeBuffer[4];
    const char* isoCodeToUse;
    // uprv_memchr checks that the string contains no internal NULs
    if (_isoCode.length() != 3 || uprv_memchr(_isoCode.data(), 0, 3) != nullptr) {
        isoCodeToUse = kDefaultCurrency8;
        ec = U_ILLEGAL_ARGUMENT_ERROR;
    } else if (!uprv_isInvariantString(_isoCode.data(), 3)) {
        // TODO: Perform a more strict ASCII check like in ICU4J isAlpha3Code?
        isoCodeToUse = kDefaultCurrency8;
        ec = U_INVARIANT_CONVERSION_ERROR;
    } else {
        // Have to use isoCodeBuffer to ensure the string is NUL-terminated
        uprv_strncpy(isoCodeBuffer, _isoCode.data(), 3);
        isoCodeBuffer[3] = 0;
        isoCodeToUse = isoCodeBuffer;
    }
    // TODO: Perform uppercasing here like in ICU4J Currency.getInstance()?
    u_charsToUChars(isoCodeToUse, isoCode, 3);
    isoCode[3] = 0;
    initCurrency(isoCodeToUse);
}

CurrencyUnit::CurrencyUnit(const CurrencyUnit& other) : MeasureUnit(other) {
    u_strcpy(isoCode, other.isoCode);
}

CurrencyUnit::CurrencyUnit(const MeasureUnit& other, UErrorCode& ec) : MeasureUnit(other) {
    // Make sure this is a currency.
    // OK to hard-code the string because we are comparing against another hard-coded string.
    if (uprv_strcmp("currency", getType()) != 0) {
        ec = U_ILLEGAL_ARGUMENT_ERROR;
        isoCode[0] = 0;
    } else {
        // Get the ISO Code from the subtype field.
        u_charsToUChars(getSubtype(), isoCode, 4);
        isoCode[3] = 0; // make 100% sure it is NUL-terminated
    }
}

CurrencyUnit::CurrencyUnit() : MeasureUnit() {
    u_strcpy(isoCode, kDefaultCurrency);
    char simpleIsoCode[4];
    u_UCharsToChars(isoCode, simpleIsoCode, 4);
    initCurrency(simpleIsoCode);
}

CurrencyUnit& CurrencyUnit::operator=(const CurrencyUnit& other) {
    if (this == &other) {
        return *this;
    }
    MeasureUnit::operator=(other);
    u_strcpy(isoCode, other.isoCode);
    return *this;
}

UObject* CurrencyUnit::clone() const {
    return new CurrencyUnit(*this);
}

CurrencyUnit::~CurrencyUnit() {
}
    
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(CurrencyUnit)

U_NAMESPACE_END

#endif // !UCONFIG_NO_FORMATTING