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#pragma once

// JSC Temporal Core — Calendar field resolution (dateFromFields, yearMonthFromFields, monthDayFromFields)
// temporal_rs reference: src/builtins/core/calendar.rs, types.rs, fields.rs

#include <JavaScriptCore/ISO8601.h>
#include <JavaScriptCore/IntlObject.h>
#include <JavaScriptCore/JSExportMacros.h>
#include <JavaScriptCore/TemporalCoreTypes.h>
#include <JavaScriptCore/TemporalEnums.h>
#include <optional>
#include <wtf/text/WTFString.h>

namespace JSC {

struct ParsedMonthCode;

namespace TemporalCore {

// Input fields for calendar date resolution.
// Maps to temporal_rs CalendarFields.
struct CalendarFieldsIn {
    std::optional<int32_t> year;
    std::optional<uint32_t> month;
    std::optional<ParsedMonthCode> monthCode;
    std::optional<uint8_t> day;
    std::optional<String> era;
    std::optional<int32_t> eraYear;
};

struct TimeFieldsIn {
    std::optional<double> hour;
    std::optional<double> minute;
    std::optional<double> second;
    std::optional<double> millisecond;
    std::optional<double> microsecond;
    std::optional<double> nanosecond;
};

// Result of calendar field resolution: ISO date + calendar ID.
struct ResolvedCalendarDate {
    ISO8601::PlainDate isoDate;
    CalendarID calendarId { 0 };
};

JS_EXPORT_PRIVATE TemporalResult<ResolvedCalendarDate> dateFromFields(CalendarID, const CalendarFieldsIn&, TemporalOverflow);

JS_EXPORT_PRIVATE TemporalResult<ResolvedCalendarDate> yearMonthFromFields(CalendarID, const CalendarFieldsIn&, TemporalOverflow);

JS_EXPORT_PRIVATE TemporalResult<ResolvedCalendarDate> monthDayFromFields(CalendarID, const CalendarFieldsIn&, TemporalOverflow);

JS_EXPORT_PRIVATE TemporalResult<ResolvedCalendarDate> plainYearMonthWith(CalendarID, const ISO8601::PlainDate& currentISODate, const CalendarFieldsIn& partialFields, TemporalOverflow);

JS_EXPORT_PRIVATE TemporalResult<ResolvedCalendarDate> plainDateWith(CalendarID, const ISO8601::PlainDate& currentISODate, const CalendarFieldsIn& partialFields, TemporalOverflow);

JS_EXPORT_PRIVATE TemporalResult<ISO8601::Duration> differenceYearMonth(CalendarID, const ISO8601::PlainDate& thisISODate, const ISO8601::PlainDate& otherISODate, TemporalUnit largestUnit);

JS_EXPORT_PRIVATE TemporalResult<ResolvedCalendarDate> plainYearMonthAdd(CalendarID, const ISO8601::PlainDate& currentISODate, const ISO8601::Duration&, TemporalOverflow);

JS_EXPORT_PRIVATE TemporalResult<ResolvedCalendarDate> plainYearMonthToPlainDate(CalendarID, const ISO8601::PlainDate& pymISODate, uint8_t day);

JS_EXPORT_PRIVATE TemporalResult<ResolvedCalendarDate> plainYearMonthFromISODate(CalendarID, const ISO8601::PlainDate& fullISODate);

JS_EXPORT_PRIVATE TemporalResult<ResolvedCalendarDate> plainMonthDayFromISODate(CalendarID, const ISO8601::PlainDate& fullISODate, TemporalOverflow);

} // namespace TemporalCore
} // namespace JSC
