/*
 * Copyright (C) 2015 Andy VanWagoner (andy@vanwagoner.family)
 * Copyright (C) 2019-2022 Apple Inc. All rights reserved.
 * Copyright (C) 2020 Sony Interactive Entertainment Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <JavaScriptCore/JSCJSValue.h>
#include <JavaScriptCore/JSCTimeZone.h>
#include <JavaScriptCore/JSObject.h>
#include <wtf/RobinHoodHashSet.h>

struct UFieldPositionIterator;

namespace JSC {

extern const uint8_t ducetLevel1Weights[256];
extern const uint8_t ducetLevel3Weights[256];

enum class LocaleMatcher : uint8_t {
    Lookup,
    BestFit,
};

#define JSC_INTL_RELEVANT_EXTENSION_KEYS(macro) \
    macro(ca, Ca) /* calendar */ \
    macro(co, Co) /* collation */ \
    macro(hc, Hc) /* hour-cycle */ \
    macro(kf, Kf) /* case-first */ \
    macro(kn, Kn) /* numeric */ \
    macro(nu, Nu) /* numbering-system */ \

enum class RelevantExtensionKey : uint8_t {
#define JSC_DECLARE_INTL_RELEVANT_EXTENSION_KEYS(lowerName, capitalizedName) capitalizedName,
JSC_INTL_RELEVANT_EXTENSION_KEYS(JSC_DECLARE_INTL_RELEVANT_EXTENSION_KEYS)
#undef JSC_DECLARE_INTL_RELEVANT_EXTENSION_KEYS
};
#define JSC_COUNT_INTL_RELEVANT_EXTENSION_KEYS(lowerName, capitalizedName) + 1
static constexpr uint8_t numberOfRelevantExtensionKeys = 0 JSC_INTL_RELEVANT_EXTENSION_KEYS(JSC_COUNT_INTL_RELEVANT_EXTENSION_KEYS);
#undef JSC_COUNT_INTL_RELEVANT_EXTENSION_KEYS

struct MeasureUnit {
    ASCIILiteral subType;
};

extern JS_EXPORT_PRIVATE const MeasureUnit simpleUnits[45];

class IntlObject final : public JSNonFinalObject {
public:
    using Base = JSNonFinalObject;
    static constexpr unsigned StructureFlags = Base::StructureFlags | HasStaticPropertyTable;

    template<typename CellType, SubspaceAccess>
    static GCClient::IsoSubspace* subspaceFor(VM& vm)
    {
        STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(IntlObject, Base);
        return &vm.plainObjectSpace();
    }

    static IntlObject* create(VM&, JSGlobalObject*, Structure*);
    static Structure* createStructure(VM&, JSGlobalObject*, JSValue);

    DECLARE_INFO;

private:
    IntlObject(VM&, Structure*);
    void finishCreation(VM&, JSGlobalObject*);
};

String defaultLocale(JSGlobalObject*);
using LocaleSet = MemoryCompactLookupOnlyRobinHoodHashSet<String>;
const LocaleSet& intlAvailableLocales();
const LocaleSet& intlCollatorAvailableLocales();
const LocaleSet& intlSegmenterAvailableLocales();
inline const LocaleSet& intlDateTimeFormatAvailableLocales() { return intlAvailableLocales(); }
inline const LocaleSet& intlDisplayNamesAvailableLocales() { return intlAvailableLocales(); }
inline const LocaleSet& intlNumberFormatAvailableLocales() { return intlAvailableLocales(); }
inline const LocaleSet& intlPluralRulesAvailableLocales() { return intlAvailableLocales(); }
inline const LocaleSet& intlRelativeTimeFormatAvailableLocales() { return intlAvailableLocales(); }
inline const LocaleSet& intlListFormatAvailableLocales() { return intlAvailableLocales(); }
inline const LocaleSet& intlDurationFormatAvailableLocales() { return intlAvailableLocales(); }

using CalendarID = unsigned;
JS_EXPORT_PRIVATE const Vector<String>& intlAvailableCalendars();

JS_EXPORT_PRIVATE const UncheckedKeyHashMap<String, CalendarID, ASCIICaseInsensitiveHash>& intlAvailableCalendarIndex();

extern CalendarID JS_EXPORT_PRIVATE iso8601CalendarIDStorage;
CalendarID JS_EXPORT_PRIVATE iso8601CalendarIDSlow();
inline CalendarID iso8601CalendarID()
{
    unsigned value = iso8601CalendarIDStorage;
    if (value == std::numeric_limits<CalendarID>::max())
        return iso8601CalendarIDSlow();
    return value;
}

// Cached CalendarIDs for calendars compared frequently in the Temporal bridge layer.
// Each follows the iso8601CalendarID() pattern: extern storage + Slow() + inline fast path.
#define FOR_EACH_CACHED_CALENDAR_ID(macro) \
    macro(buddhist, "buddhist"_s) \
    macro(chinese, "chinese"_s) \
    macro(coptic, "coptic"_s) \
    macro(dangi, "dangi"_s) \
    macro(ethioaa, "ethioaa"_s) \
    macro(ethiopic, "ethiopic"_s) \
    macro(gregory, "gregory"_s) \
    macro(hebrew, "hebrew"_s) \
    macro(indian, "indian"_s) \
    macro(islamic, "islamic"_s) \
    macro(islamicCivil, "islamic-civil"_s) \
    macro(islamicRgsa, "islamic-rgsa"_s) \
    macro(islamicTbla, "islamic-tbla"_s) \
    macro(islamicUmalqura, "islamic-umalqura"_s) \
    macro(japanese, "japanese"_s) \
    macro(persian, "persian"_s) \
    macro(roc, "roc"_s)

#define DECLARE_CALENDAR_ID(name, str) \
    extern CalendarID JS_EXPORT_PRIVATE name##CalendarIDStorage; \
    CalendarID JS_EXPORT_PRIVATE name##CalendarIDSlow(); \
    inline CalendarID name##CalendarID() \
    { \
        unsigned value = name##CalendarIDStorage; \
        if (value == std::numeric_limits<CalendarID>::max()) \
            return name##CalendarIDSlow(); \
        return value; \
    }
FOR_EACH_CACHED_CALENDAR_ID(DECLARE_CALENDAR_ID)
#undef DECLARE_CALENDAR_ID

// Resolve any accepted time zone string (case-insensitive; accepts IANA primary
// identifiers, IANA Backward links such as "Asia/Calcutta", and UTC-equivalent
// aliases such as "GMT" / "Etc/UTC") to the TimeZoneID of its IANA primary,
// or std::nullopt if the input is not a recognized IANA zone. Multiple input
// forms collapse to the same TimeZoneID.
JS_EXPORT_PRIVATE std::optional<TimeZoneID> intlResolveTimeZoneID(StringView);

// Same lookup as intlResolveTimeZoneID, but additionally returns the
// case-normalized accepted identifier (the [[Identifier]] in spec terms — for
// Backward links such as "Asia/Calcutta" this is "Asia/Calcutta", not the
// primary "Asia/Kolkata"). The identifier is an immortal static string.
struct AvailableNamedTimeZone {
    TimeZoneID id;
    String identifier;
};
JS_EXPORT_PRIVATE std::optional<AvailableNamedTimeZone> intlAvailableNamedTimeZone(StringView);

// Map a known-valid IANA time zone ID to its primary IANA zone identifier,
// using ICU 74's ucal_getIanaTimeZoneID when available and falling back to
// ucal_getCanonicalTimeZoneID otherwise. UTC-equivalent zones are normalized
// to "UTC" per ECMA-402.
JS_EXPORT_PRIVATE String toPrimaryIanaTimeZoneIdentifier(std::span<const char16_t> timeZone);
JS_EXPORT_PRIVATE String toPrimaryIanaTimeZoneIdentifier(StringView timeZone);

void initializeAvailableTimeZones();

TriState intlBooleanOption(JSGlobalObject*, JSObject* options, PropertyName);
String intlStringOption(JSGlobalObject*, JSObject* options, PropertyName, std::initializer_list<ASCIILiteral> values, ASCIILiteral notFound, ASCIILiteral fallback);
unsigned intlNumberOption(JSGlobalObject*, JSObject* options, PropertyName, unsigned minimum, unsigned maximum, unsigned fallback);
unsigned intlDefaultNumberOption(JSGlobalObject*, JSValue, PropertyName, unsigned minimum, unsigned maximum, unsigned fallback);
Vector<char, 32> localeIDBufferForLanguageTagWithNullTerminator(const CString&);
String languageTagForLocaleID(const char*, bool isImmortal = false);
Vector<String> canonicalizeLocaleList(JSGlobalObject*, JSValue locales);

using ResolveLocaleOptions = std::array<std::optional<String>, numberOfRelevantExtensionKeys>;
using RelevantExtensions = std::array<String, numberOfRelevantExtensionKeys>;
struct ResolvedLocale {
    String locale;
    String dataLocale;
    RelevantExtensions extensions;
};

ResolvedLocale resolveLocale(JSGlobalObject*, const LocaleSet& availableLocales, const Vector<String>& requestedLocales, LocaleMatcher, const ResolveLocaleOptions&, std::initializer_list<RelevantExtensionKey> relevantExtensionKeys, Vector<String> (*localeData)(const String&, RelevantExtensionKey));
JSValue supportedLocales(JSGlobalObject*, const LocaleSet& availableLocales, const Vector<String>& requestedLocales, JSValue options);
String removeUnicodeLocaleExtension(StringView locale);
String extractNonUnicodeBCP47Extensions(StringView locale);
String bestAvailableLocale(const LocaleSet& availableLocales, const String& requestedLocale);
template<typename Predicate> String bestAvailableLocale(const String& requestedLocale, Predicate);
Vector<String> numberingSystemsForLocale(const String& locale);
String defaultNumberingSystemForLocale(const String& dataLocale);
String defaultCalendarForLocale(const String& dataLocale);

Vector<char, 32> canonicalizeUnicodeExtensionsAfterICULocaleCanonicalization(Vector<char, 32>&&);

bool isUnicodeLocaleIdentifierType(StringView);

bool NODELETE isUnicodeLanguageSubtag(StringView);
bool NODELETE isUnicodeScriptSubtag(StringView);
bool NODELETE isUnicodeRegionSubtag(StringView);
bool NODELETE isUnicodeVariantSubtag(StringView);
bool isUnicodeLanguageId(StringView);
JS_EXPORT_PRIVATE bool isStructurallyValidLanguageTag(StringView);
String canonicalizeUnicodeLocaleID(const CString& languageTag);
JS_EXPORT_PRIVATE String canonicalizeUnicodeLocaleID(const StringView);

bool NODELETE isWellFormedCurrencyCode(StringView);

std::optional<Vector<char, 32>> canonicalizeLocaleIDWithoutNullTerminator(const char* localeID);

struct UFieldPositionIteratorDeleter {
    void operator()(UFieldPositionIterator*) const;
};

std::optional<String> mapICUCollationKeywordToBCP47(const String&);
std::optional<String> mapICUCalendarKeywordToBCP47(const String&);
std::optional<String> mapBCP47ToICUCalendarKeyword(const String&);

} // namespace JSC
