/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "builtin/temporal/PlainDateTime.h"

#include "mozilla/Assertions.h"

#include <algorithm>
#include <type_traits>
#include <utility>

#include "jsnum.h"
#include "jspubtd.h"
#include "NamespaceImports.h"

#include "builtin/temporal/Calendar.h"
#include "builtin/temporal/Duration.h"
#include "builtin/temporal/PlainDate.h"
#include "builtin/temporal/PlainMonthDay.h"
#include "builtin/temporal/PlainTime.h"
#include "builtin/temporal/PlainYearMonth.h"
#include "builtin/temporal/Temporal.h"
#include "builtin/temporal/TemporalFields.h"
#include "builtin/temporal/TemporalParser.h"
#include "builtin/temporal/TemporalRoundingMode.h"
#include "builtin/temporal/TemporalTypes.h"
#include "builtin/temporal/TemporalUnit.h"
#include "builtin/temporal/TimeZone.h"
#include "builtin/temporal/ToString.h"
#include "builtin/temporal/Wrapped.h"
#include "builtin/temporal/ZonedDateTime.h"
#include "ds/IdValuePair.h"
#include "gc/AllocKind.h"
#include "gc/Barrier.h"
#include "js/AllocPolicy.h"
#include "js/CallArgs.h"
#include "js/CallNonGenericMethod.h"
#include "js/Class.h"
#include "js/ErrorReport.h"
#include "js/friend/ErrorMessages.h"
#include "js/GCVector.h"
#include "js/Id.h"
#include "js/PropertyDescriptor.h"
#include "js/PropertySpec.h"
#include "js/RootingAPI.h"
#include "js/TypeDecls.h"
#include "js/Value.h"
#include "vm/BytecodeUtil.h"
#include "vm/GlobalObject.h"
#include "vm/JSAtomState.h"
#include "vm/JSContext.h"
#include "vm/JSObject.h"
#include "vm/ObjectOperations.h"
#include "vm/PlainObject.h"
#include "vm/StringType.h"

#include "vm/JSObject-inl.h"
#include "vm/NativeObject-inl.h"

using namespace js;
using namespace js::temporal;

static inline bool IsPlainDateTime(Handle<Value> v) {
  return v.isObject() && v.toObject().is<PlainDateTimeObject>();
}

#ifdef DEBUG
/**
 * IsValidISODateTime ( year, month, day, hour, minute, second, millisecond,
 * microsecond, nanosecond )
 */
bool js::temporal::IsValidISODateTime(const PlainDateTime& dateTime) {
  return IsValidISODate(dateTime.date) && IsValidTime(dateTime.time);
}
#endif

/**
 * IsValidISODateTime ( year, month, day, hour, minute, second, millisecond,
 * microsecond, nanosecond )
 */
static bool ThrowIfInvalidISODateTime(JSContext* cx,
                                      const PlainDateTime& dateTime) {
  return ThrowIfInvalidISODate(cx, dateTime.date) &&
         ThrowIfInvalidTime(cx, dateTime.time);
}

/**
 * ISODateTimeWithinLimits ( year, month, day, hour, minute, second,
 * millisecond, microsecond, nanosecond )
 */
template <typename T>
static bool ISODateTimeWithinLimits(T year, T month, T day, T hour, T minute,
                                    T second, T millisecond, T microsecond,
                                    T nanosecond) {
  static_assert(std::is_same_v<T, int32_t> || std::is_same_v<T, double>);

  // Step 1.
  MOZ_ASSERT(IsInteger(year));
  MOZ_ASSERT(IsInteger(month));
  MOZ_ASSERT(IsInteger(day));
  MOZ_ASSERT(IsInteger(hour));
  MOZ_ASSERT(IsInteger(minute));
  MOZ_ASSERT(IsInteger(second));
  MOZ_ASSERT(IsInteger(millisecond));
  MOZ_ASSERT(IsInteger(microsecond));
  MOZ_ASSERT(IsInteger(nanosecond));

  MOZ_ASSERT(IsValidISODate(year, month, day));
  MOZ_ASSERT(
      IsValidTime(hour, minute, second, millisecond, microsecond, nanosecond));

  // js> new Date(-8_64000_00000_00000).toISOString()
  // "-271821-04-20T00:00:00.000Z"
  //
  // js> new Date(+8_64000_00000_00000).toISOString()
  // "+275760-09-13T00:00:00.000Z"

  constexpr int32_t minYear = -271821;
  constexpr int32_t maxYear = 275760;

  // Definitely in range.
  if (minYear < year && year < maxYear) {
    return true;
  }

  // -271821 April, 20
  if (year < 0) {
    if (year != minYear) {
      return false;
    }
    if (month != 4) {
      return month > 4;
    }
    if (day != (20 - 1)) {
      return day > (20 - 1);
    }
    // Needs to be past midnight on April, 19.
    return !(hour == 0 && minute == 0 && second == 0 && millisecond == 0 &&
             microsecond == 0 && nanosecond == 0);
  }

  // 275760 September, 13
  if (year != maxYear) {
    return false;
  }
  if (month != 9) {
    return month < 9;
  }
  if (day > 13) {
    return false;
  }
  return true;
}

/**
 * ISODateTimeWithinLimits ( year, month, day, hour, minute, second,
 * millisecond, microsecond, nanosecond )
 */
template <typename T>
static bool ISODateTimeWithinLimits(T year, T month, T day) {
  static_assert(std::is_same_v<T, int32_t> || std::is_same_v<T, double>);

  MOZ_ASSERT(IsValidISODate(year, month, day));

  // js> new Date(-8_64000_00000_00000).toISOString()
  // "-271821-04-20T00:00:00.000Z"
  //
  // js> new Date(+8_64000_00000_00000).toISOString()
  // "+275760-09-13T00:00:00.000Z"

  constexpr int32_t minYear = -271821;
  constexpr int32_t maxYear = 275760;

  // ISODateTimeWithinLimits is called with hour=12 and the remaining time
  // components set to zero. That means the maximum value is exclusive, whereas
  // the minimum value is inclusive.

  // FIXME: spec bug - GetUTCEpochNanoseconds when called with large |year| may
  // cause MakeDay to return NaN, which makes MakeDate return NaN, which is
  // unexpected in GetUTCEpochNanoseconds, step 4.
  // https://github.com/tc39/proposal-temporal/issues/2315

  // Definitely in range.
  if (minYear < year && year < maxYear) {
    return true;
  }

  // -271821 April, 20
  if (year < 0) {
    if (year != minYear) {
      return false;
    }
    if (month != 4) {
      return month > 4;
    }
    if (day < (20 - 1)) {
      return false;
    }
    return true;
  }

  // 275760 September, 13
  if (year != maxYear) {
    return false;
  }
  if (month != 9) {
    return month < 9;
  }
  if (day > 13) {
    return false;
  }
  return true;
}

/**
 * ISODateTimeWithinLimits ( year, month, day, hour, minute, second,
 * millisecond, microsecond, nanosecond )
 */
bool js::temporal::ISODateTimeWithinLimits(double year, double month,
                                           double day) {
  return ::ISODateTimeWithinLimits(year, month, day);
}

/**
 * ISODateTimeWithinLimits ( year, month, day, hour, minute, second,
 * millisecond, microsecond, nanosecond )
 */
bool js::temporal::ISODateTimeWithinLimits(const PlainDateTime& dateTime) {
  auto& [date, time] = dateTime;
  return ::ISODateTimeWithinLimits(date.year, date.month, date.day, time.hour,
                                   time.minute, time.second, time.millisecond,
                                   time.microsecond, time.nanosecond);
}

/**
 * ISODateTimeWithinLimits ( year, month, day, hour, minute, second,
 * millisecond, microsecond, nanosecond )
 */
bool js::temporal::ISODateTimeWithinLimits(const PlainDate& date) {
  return ::ISODateTimeWithinLimits(date.year, date.month, date.day);
}

/**
 * CreateTemporalDateTime ( isoYear, isoMonth, isoDay, hour, minute, second,
 * millisecond, microsecond, nanosecond, calendar [ , newTarget ] )
 */
static PlainDateTimeObject* CreateTemporalDateTime(
    JSContext* cx, const CallArgs& args, double isoYear, double isoMonth,
    double isoDay, double hour, double minute, double second,
    double millisecond, double microsecond, double nanosecond,
    Handle<CalendarValue> calendar) {
  MOZ_ASSERT(IsInteger(isoYear));
  MOZ_ASSERT(IsInteger(isoMonth));
  MOZ_ASSERT(IsInteger(isoDay));
  MOZ_ASSERT(IsInteger(hour));
  MOZ_ASSERT(IsInteger(minute));
  MOZ_ASSERT(IsInteger(second));
  MOZ_ASSERT(IsInteger(millisecond));
  MOZ_ASSERT(IsInteger(microsecond));
  MOZ_ASSERT(IsInteger(nanosecond));

  // Step 1.
  if (!ThrowIfInvalidISODate(cx, isoYear, isoMonth, isoDay)) {
    return nullptr;
  }

  // Step 2.
  if (!ThrowIfInvalidTime(cx, hour, minute, second, millisecond, microsecond,
                          nanosecond)) {
    return nullptr;
  }

  // Step 3.
  if (!ISODateTimeWithinLimits(isoYear, isoMonth, isoDay, hour, minute, second,
                               millisecond, microsecond, nanosecond)) {
    JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                              JSMSG_TEMPORAL_PLAIN_DATE_TIME_INVALID);
    return nullptr;
  }

  // Steps 4-5.
  Rooted<JSObject*> proto(cx);
  if (!GetPrototypeFromBuiltinConstructor(cx, args, JSProto_PlainDateTime,
                                          &proto)) {
    return nullptr;
  }

  auto* dateTime = NewObjectWithClassProto<PlainDateTimeObject>(cx, proto);
  if (!dateTime) {
    return nullptr;
  }

  // Step 6.
  dateTime->setFixedSlot(PlainDateTimeObject::ISO_YEAR_SLOT,
                         Int32Value(isoYear));

  // Step 7.
  dateTime->setFixedSlot(PlainDateTimeObject::ISO_MONTH_SLOT,
                         Int32Value(isoMonth));

  // Step 8.
  dateTime->setFixedSlot(PlainDateTimeObject::ISO_DAY_SLOT, Int32Value(isoDay));

  // Step 9.
  dateTime->setFixedSlot(PlainDateTimeObject::ISO_HOUR_SLOT, Int32Value(hour));

  // Step 10.
  dateTime->setFixedSlot(PlainDateTimeObject::ISO_MINUTE_SLOT,
                         Int32Value(minute));

  // Step 11.
  dateTime->setFixedSlot(PlainDateTimeObject::ISO_SECOND_SLOT,
                         Int32Value(second));

  // Step 12.
  dateTime->setFixedSlot(PlainDateTimeObject::ISO_MILLISECOND_SLOT,
                         Int32Value(millisecond));

  // Step 13.
  dateTime->setFixedSlot(PlainDateTimeObject::ISO_MICROSECOND_SLOT,
                         Int32Value(microsecond));

  // Step 14.
  dateTime->setFixedSlot(PlainDateTimeObject::ISO_NANOSECOND_SLOT,
                         Int32Value(nanosecond));

  // Step 15.
  dateTime->setFixedSlot(PlainDateTimeObject::CALENDAR_SLOT,
                         calendar.toValue());

  // Step 16.
  return dateTime;
}

/**
 * CreateTemporalDateTime ( isoYear, isoMonth, isoDay, hour, minute, second,
 * millisecond, microsecond, nanosecond, calendar [ , newTarget ] )
 */
PlainDateTimeObject* js::temporal::CreateTemporalDateTime(
    JSContext* cx, const PlainDateTime& dateTime,
    Handle<CalendarValue> calendar) {
  auto& [date, time] = dateTime;
  auto& [isoYear, isoMonth, isoDay] = date;
  auto& [hour, minute, second, millisecond, microsecond, nanosecond] = time;

  // Steps 1-2.
  if (!ThrowIfInvalidISODateTime(cx, dateTime)) {
    return nullptr;
  }

  // Step 3.
  if (!ISODateTimeWithinLimits(dateTime)) {
    JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                              JSMSG_TEMPORAL_PLAIN_DATE_TIME_INVALID);
    return nullptr;
  }

  // Steps 4-5.
  auto* object = NewBuiltinClassInstance<PlainDateTimeObject>(cx);
  if (!object) {
    return nullptr;
  }

  // Step 6.
  object->setFixedSlot(PlainDateTimeObject::ISO_YEAR_SLOT, Int32Value(isoYear));

  // Step 7.
  object->setFixedSlot(PlainDateTimeObject::ISO_MONTH_SLOT,
                       Int32Value(isoMonth));

  // Step 8.
  object->setFixedSlot(PlainDateTimeObject::ISO_DAY_SLOT, Int32Value(isoDay));

  // Step 9.
  object->setFixedSlot(PlainDateTimeObject::ISO_HOUR_SLOT, Int32Value(hour));

  // Step 10.
  object->setFixedSlot(PlainDateTimeObject::ISO_MINUTE_SLOT,
                       Int32Value(minute));

  // Step 11.
  object->setFixedSlot(PlainDateTimeObject::ISO_SECOND_SLOT,
                       Int32Value(second));

  // Step 12.
  object->setFixedSlot(PlainDateTimeObject::ISO_MILLISECOND_SLOT,
                       Int32Value(millisecond));

  // Step 13.
  object->setFixedSlot(PlainDateTimeObject::ISO_MICROSECOND_SLOT,
                       Int32Value(microsecond));

  // Step 14.
  object->setFixedSlot(PlainDateTimeObject::ISO_NANOSECOND_SLOT,
                       Int32Value(nanosecond));

  // Step 15.
  object->setFixedSlot(PlainDateTimeObject::CALENDAR_SLOT, calendar.toValue());

  // Step 16.
  return object;
}

/**
 * CreateTemporalDateTime ( isoYear, isoMonth, isoDay, hour, minute, second,
 * millisecond, microsecond, nanosecond, calendar [ , newTarget ] )
 */
bool js::temporal::CreateTemporalDateTime(
    JSContext* cx, const PlainDateTime& dateTime,
    Handle<CalendarValue> calendar,
    MutableHandle<PlainDateTimeWithCalendar> result) {
  // Steps 1-2.
  if (!ThrowIfInvalidISODateTime(cx, dateTime)) {
    return false;
  }

  // Step 3.
  if (!ISODateTimeWithinLimits(dateTime)) {
    JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                              JSMSG_TEMPORAL_PLAIN_DATE_TIME_INVALID);
    return false;
  }

  result.set(PlainDateTimeWithCalendar{dateTime, calendar});
  return true;
}

/**
 * InterpretTemporalDateTimeFields ( calendarRec, fields, options )
 */
bool js::temporal::InterpretTemporalDateTimeFields(
    JSContext* cx, Handle<CalendarRecord> calendar, Handle<PlainObject*> fields,
    Handle<PlainObject*> options, PlainDateTime* result) {
  // Step 1. (Not applicable in our implementation.)

  // Step 2.
  MOZ_ASSERT(CalendarMethodsRecordHasLookedUp(calendar,
                                              CalendarMethod::DateFromFields));

  // Step 3.
  TimeRecord timeResult;
  if (!ToTemporalTimeRecord(cx, fields, &timeResult)) {
    return false;
  }

  // Step 4.
  auto overflow = TemporalOverflow::Constrain;
  if (!ToTemporalOverflow(cx, options, &overflow)) {
    return false;
  }

  // Steps 5-6.
  Rooted<Value> overflowValue(cx);
  if (overflow == TemporalOverflow::Constrain) {
    overflowValue.setString(cx->names().constrain);
  } else {
    MOZ_ASSERT(overflow == TemporalOverflow::Reject);
    overflowValue.setString(cx->names().reject);
  }
  if (!DefineDataProperty(cx, options, cx->names().overflow, overflowValue)) {
    return false;
  }

  // Step 7.
  auto temporalDate =
      js::temporal::CalendarDateFromFields(cx, calendar, fields, options);
  if (!temporalDate) {
    return false;
  }
  auto date = ToPlainDate(&temporalDate.unwrap());

  // Step 8.
  PlainTime time;
  if (!RegulateTime(cx, timeResult, overflow, &time)) {
    return false;
  }

  // Step 9.
  *result = {date, time};
  return true;
}

/**
 * InterpretTemporalDateTimeFields ( calendarRec, fields, options )
 */
bool js::temporal::InterpretTemporalDateTimeFields(
    JSContext* cx, Handle<CalendarRecord> calendar, Handle<PlainObject*> fields,
    PlainDateTime* result) {
  // TODO: Avoid creating the options object when CalendarDateFromFields calls
  // the built-in Calendar.prototype.dateFromFields method.
  Rooted<PlainObject*> options(cx, NewPlainObjectWithProto(cx, nullptr));
  if (!options) {
    return false;
  }

  return InterpretTemporalDateTimeFields(cx, calendar, fields, options, result);
}

/**
 * ToTemporalDateTime ( item [ , options ] )
 */
static Wrapped<PlainDateTimeObject*> ToTemporalDateTime(
    JSContext* cx, Handle<Value> item, Handle<JSObject*> maybeOptions) {
  // Step 1. (Not applicable)

  // Step 2.
  Rooted<PlainObject*> maybeResolvedOptions(cx);
  if (maybeOptions) {
    maybeResolvedOptions = SnapshotOwnProperties(cx, maybeOptions);
    if (!maybeResolvedOptions) {
      return nullptr;
    }
  }

  // Steps 3-4.
  Rooted<CalendarValue> calendar(cx);
  PlainDateTime result;
  if (item.isObject()) {
    Rooted<JSObject*> itemObj(cx, &item.toObject());

    // Step 3.a.
    if (itemObj->canUnwrapAs<PlainDateTimeObject>()) {
      return itemObj;
    }

    // Step 3.b.
    if (auto* zonedDateTime = itemObj->maybeUnwrapIf<ZonedDateTimeObject>()) {
      auto epochInstant = ToInstant(zonedDateTime);
      Rooted<TimeZoneValue> timeZone(cx, zonedDateTime->timeZone());
      Rooted<CalendarValue> calendar(cx, zonedDateTime->calendar());

      if (!timeZone.wrap(cx)) {
        return nullptr;
      }
      if (!calendar.wrap(cx)) {
        return nullptr;
      }

      // Step 3.b.i.
      if (maybeResolvedOptions) {
        TemporalOverflow ignored;
        if (!ToTemporalOverflow(cx, maybeResolvedOptions, &ignored)) {
          return nullptr;
        }
      }

      // Steps 3.b.ii-iv.
      return GetPlainDateTimeFor(cx, timeZone, epochInstant, calendar);
    }

    // Step 3.c.
    if (auto* date = itemObj->maybeUnwrapIf<PlainDateObject>()) {
      PlainDateTime dateTime = {ToPlainDate(date), {}};
      Rooted<CalendarValue> calendar(cx, date->calendar());
      if (!calendar.wrap(cx)) {
        return nullptr;
      }

      // Step 3.c.i.
      if (maybeResolvedOptions) {
        TemporalOverflow ignored;
        if (!ToTemporalOverflow(cx, maybeResolvedOptions, &ignored)) {
          return nullptr;
        }
      }

      // Step 3.c.ii.
      return CreateTemporalDateTime(cx, dateTime, calendar);
    }

    // Step 3.d.
    if (!GetTemporalCalendarWithISODefault(cx, itemObj, &calendar)) {
      return nullptr;
    }

    // Step 3.e.
    Rooted<CalendarRecord> calendarRec(cx);
    if (!CreateCalendarMethodsRecord(cx, calendar,
                                     {
                                         CalendarMethod::DateFromFields,
                                         CalendarMethod::Fields,
                                     },
                                     &calendarRec)) {
      return nullptr;
    }

    // Step 3.f.
    JS::RootedVector<PropertyKey> fieldNames(cx);
    if (!CalendarFields(cx, calendarRec,
                        {CalendarField::Day, CalendarField::Month,
                         CalendarField::MonthCode, CalendarField::Year},
                        &fieldNames)) {
      return nullptr;
    }

    // Step 3.g.
    if (!AppendSorted(cx, fieldNames.get(),
                      {
                          TemporalField::Hour,
                          TemporalField::Microsecond,
                          TemporalField::Millisecond,
                          TemporalField::Minute,
                          TemporalField::Nanosecond,
                          TemporalField::Second,
                      })) {
      return nullptr;
    }

    // Step 3.h.
    Rooted<PlainObject*> fields(cx,
                                PrepareTemporalFields(cx, itemObj, fieldNames));
    if (!fields) {
      return nullptr;
    }

    // Step 3.i.
    if (maybeResolvedOptions) {
      if (!InterpretTemporalDateTimeFields(cx, calendarRec, fields,
                                           maybeResolvedOptions, &result)) {
        return nullptr;
      }
    } else {
      if (!InterpretTemporalDateTimeFields(cx, calendarRec, fields, &result)) {
        return nullptr;
      }
    }
  } else {
    // Step 4.a.
    if (!item.isString()) {
      ReportValueError(cx, JSMSG_UNEXPECTED_TYPE, JSDVG_IGNORE_STACK, item,
                       nullptr, "not a string");
      return nullptr;
    }
    Rooted<JSString*> string(cx, item.toString());

    // Step 4.b.
    Rooted<JSString*> calendarString(cx);
    if (!ParseTemporalDateTimeString(cx, string, &result, &calendarString)) {
      return nullptr;
    }

    // Step 4.c.
    MOZ_ASSERT(IsValidISODate(result.date));

    // Step 4.d.
    MOZ_ASSERT(IsValidTime(result.time));

    // Steps 4.e-h.
    if (calendarString) {
      if (!ToBuiltinCalendar(cx, calendarString, &calendar)) {
        return nullptr;
      }
    } else {
      calendar.set(CalendarValue(cx->names().iso8601));
    }

    // Step 4.i.
    if (maybeResolvedOptions) {
      TemporalOverflow ignored;
      if (!ToTemporalOverflow(cx, maybeResolvedOptions, &ignored)) {
        return nullptr;
      }
    }
  }

  // Step 5.
  return CreateTemporalDateTime(cx, result, calendar);
}

/**
 * ToTemporalDateTime ( item [ , options ] )
 */
Wrapped<PlainDateTimeObject*> js::temporal::ToTemporalDateTime(
    JSContext* cx, Handle<Value> item) {
  return ::ToTemporalDateTime(cx, item, nullptr);
}

/**
 * ToTemporalDateTime ( item [ , options ] )
 */
bool js::temporal::ToTemporalDateTime(JSContext* cx, Handle<Value> item,
                                      PlainDateTime* result) {
  auto obj = ::ToTemporalDateTime(cx, item, nullptr);
  if (!obj) {
    return false;
  }

  *result = ToPlainDateTime(&obj.unwrap());
  return true;
}

/**
 * ToTemporalDateTime ( item [ , options ] )
 */
static bool ToTemporalDateTime(
    JSContext* cx, Handle<Value> item,
    MutableHandle<PlainDateTimeWithCalendar> result) {
  HandleObject options = nullptr;

  auto* obj = ::ToTemporalDateTime(cx, item, options).unwrapOrNull();
  if (!obj) {
    return false;
  }

  auto dateTime = ToPlainDateTime(obj);
  Rooted<CalendarValue> calendar(cx, obj->calendar());
  if (!calendar.wrap(cx)) {
    return false;
  }

  result.set(PlainDateTimeWithCalendar{dateTime, calendar});
  return true;
}

/**
 * CompareISODateTime ( y1, mon1, d1, h1, min1, s1, ms1, mus1, ns1, y2, mon2,
 * d2, h2, min2, s2, ms2, mus2, ns2 )
 */
static int32_t CompareISODateTime(const PlainDateTime& one,
                                  const PlainDateTime& two) {
  // Step 1. (Not applicable in our implementation.)

  // Steps 2-3.
  if (int32_t dateResult = CompareISODate(one.date, two.date)) {
    return dateResult;
  }

  // Steps 4.
  return CompareTemporalTime(one.time, two.time);
}

/**
 * AddDateTime ( year, month, day, hour, minute, second, millisecond,
 * microsecond, nanosecond, calendarRec, years, months, weeks, days, hours,
 * minutes, seconds, milliseconds, microseconds, nanoseconds, options )
 */
static bool AddDateTime(JSContext* cx, const PlainDateTime& dateTime,
                        Handle<CalendarRecord> calendar,
                        const Duration& duration, Handle<JSObject*> options,
                        PlainDateTime* result) {
  MOZ_ASSERT(IsValidDuration(duration));

  // Step 1.
  MOZ_ASSERT(IsValidISODateTime(dateTime));
  MOZ_ASSERT(ISODateTimeWithinLimits(dateTime));

  // Step 2.
  PlainTime timeResult;
  double daysResult;
  if (!AddTime(cx, dateTime.time, duration, &timeResult, &daysResult)) {
    return false;
  }

  // Step 3.
  const auto& datePart = dateTime.date;

  // Step 4.
  Duration dateDuration = {duration.years, duration.months, duration.weeks,
                           daysResult};
  MOZ_ASSERT(IsValidDuration(duration));

  // Step 5.
  PlainDate addedDate;
  if (!AddDate(cx, calendar, datePart, dateDuration, options, &addedDate)) {
    return false;
  }

  // Step 6.
  *result = {addedDate, timeResult};
  return true;
}

/**
 * DifferenceISODateTime ( y1, mon1, d1, h1, min1, s1, ms1, mus1, ns1, y2, mon2,
 * d2, h2, min2, s2, ms2, mus2, ns2, calendarRec, largestUnit, options )
 */
static bool DifferenceISODateTime(JSContext* cx, const PlainDateTime& one,
                                  const PlainDateTime& two,
                                  Handle<CalendarRecord> calendar,
                                  TemporalUnit largestUnit,
                                  Handle<PlainObject*> maybeOptions,
                                  Duration* result) {
  // Steps 1-2.
  MOZ_ASSERT(IsValidISODateTime(one));
  MOZ_ASSERT(IsValidISODateTime(two));
  MOZ_ASSERT(ISODateTimeWithinLimits(one));
  MOZ_ASSERT(ISODateTimeWithinLimits(two));

  // Step 3.
  MOZ_ASSERT_IF(
      one.date != two.date && largestUnit < TemporalUnit::Day,
      CalendarMethodsRecordHasLookedUp(calendar, CalendarMethod::DateUntil));

  // Step 4.
  auto timeDifference = DifferenceTime(one.time, two.time);

  // Step 5.
  int32_t timeSign = DurationSign(timeDifference.toDuration());

  // Step 6.
  int32_t dateSign = CompareISODate(two.date, one.date);

  // Step 7.
  auto adjustedDate = one.date;

  // Step 8.
  if (timeSign == -dateSign) {
    // Step 8.a.
    adjustedDate = BalanceISODate(adjustedDate.year, adjustedDate.month,
                                  adjustedDate.day - timeSign);

    // Step 8.b.
    if (!BalanceTimeDuration(cx,
                             {
                                 0,
                                 0,
                                 0,
                                 double(-timeSign),
                                 timeDifference.hours,
                                 timeDifference.minutes,
                                 timeDifference.seconds,
                                 timeDifference.milliseconds,
                                 timeDifference.microseconds,
                                 timeDifference.nanoseconds,
                             },
                             largestUnit, &timeDifference)) {
      return false;
    }
  }

  MOZ_ASSERT(IsValidISODate(adjustedDate));
  MOZ_ASSERT(ISODateTimeWithinLimits(adjustedDate));

  // TODO: Avoid allocating CreateTemporalDate.

  // Step 9.
  Rooted<PlainDateObject*> date1(
      cx, CreateTemporalDate(cx, adjustedDate, calendar.receiver()));
  if (!date1) {
    return false;
  }

  // Step 10.
  Rooted<PlainDateObject*> date2(
      cx, CreateTemporalDate(cx, two.date, calendar.receiver()));
  if (!date2) {
    return false;
  }

  // Step 11.
  auto dateLargestUnit = std::min(TemporalUnit::Day, largestUnit);

  Duration dateDifference;
  if (maybeOptions) {
    // FIXME: spec issue - this copy is no longer needed, all callers have
    // already copied the user input object.
    // https://github.com/tc39/proposal-temporal/issues/2525

    // Step 12.
    Rooted<PlainObject*> untilOptions(cx,
                                      SnapshotOwnProperties(cx, maybeOptions));
    if (!untilOptions) {
      return false;
    }

    // Step 13.
    Rooted<Value> largestUnitValue(
        cx, StringValue(TemporalUnitToString(cx, dateLargestUnit)));
    if (!DefineDataProperty(cx, untilOptions, cx->names().largestUnit,
                            largestUnitValue)) {
      return false;
    }

    // Step 14.
    if (!DifferenceDate(cx, calendar, date1, date2, untilOptions,
                        &dateDifference)) {
      return false;
    }
  } else {
    // Steps 12-14.
    if (!DifferenceDate(cx, calendar, date1, date2, dateLargestUnit,
                        &dateDifference)) {
      return false;
    }
  }

  // Step 15.
  TimeDuration balanceResult;
  if (!BalanceTimeDuration(cx,
                           {
                               0,
                               0,
                               0,
                               dateDifference.days,
                               timeDifference.hours,
                               timeDifference.minutes,
                               timeDifference.seconds,
                               timeDifference.milliseconds,
                               timeDifference.microseconds,
                               timeDifference.nanoseconds,
                           },
                           largestUnit, &balanceResult)) {
    return false;
  }

  // Step 16.
  *result = {dateDifference.years,       dateDifference.months,
             dateDifference.weeks,       balanceResult.days,
             balanceResult.hours,        balanceResult.minutes,
             balanceResult.seconds,      balanceResult.milliseconds,
             balanceResult.microseconds, balanceResult.nanoseconds};
  MOZ_ASSERT(IsValidDuration(*result));
  return true;
}

/**
 * DifferenceISODateTime ( y1, mon1, d1, h1, min1, s1, ms1, mus1, ns1, y2, mon2,
 * d2, h2, min2, s2, ms2, mus2, ns2, calendarRec, largestUnit, options )
 */
bool js::temporal::DifferenceISODateTime(JSContext* cx,
                                         const PlainDateTime& one,
                                         const PlainDateTime& two,
                                         Handle<CalendarRecord> calendar,
                                         TemporalUnit largestUnit,
                                         Duration* result) {
  return ::DifferenceISODateTime(cx, one, two, calendar, largestUnit, nullptr,
                                 result);
}

/**
 * DifferenceISODateTime ( y1, mon1, d1, h1, min1, s1, ms1, mus1, ns1, y2, mon2,
 * d2, h2, min2, s2, ms2, mus2, ns2, calendarRec, largestUnit, options )
 */
bool js::temporal::DifferenceISODateTime(
    JSContext* cx, const PlainDateTime& one, const PlainDateTime& two,
    Handle<CalendarRecord> calendar, TemporalUnit largestUnit,
    Handle<PlainObject*> options, Duration* result) {
  return ::DifferenceISODateTime(cx, one, two, calendar, largestUnit, options,
                                 result);
}

/**
 * RoundISODateTime ( year, month, day, hour, minute, second, millisecond,
 * microsecond, nanosecond, increment, unit, roundingMode [ , dayLength ] )
 */
static PlainDateTime RoundISODateTime(const PlainDateTime& dateTime,
                                      Increment increment, TemporalUnit unit,
                                      TemporalRoundingMode roundingMode) {
  const auto& [date, time] = dateTime;

  // Step 1.
  MOZ_ASSERT(IsValidISODateTime(dateTime));
  MOZ_ASSERT(ISODateTimeWithinLimits(dateTime));

  // Step 2. (Not applicable in our implementation.)

  // Step 3.
  auto roundedTime = RoundTime(time, increment, unit, roundingMode);
  MOZ_ASSERT(0 <= roundedTime.days && roundedTime.days <= 1);

  // Step 4.
  auto balanceResult =
      BalanceISODate(date.year, date.month, date.day + roundedTime.days);

  // Step 5.
  return {balanceResult, roundedTime.time};
}

/**
 * DifferenceTemporalPlainDateTime ( operation, dateTime, other, options )
 */
static bool DifferenceTemporalPlainDateTime(JSContext* cx,
                                            TemporalDifference operation,
                                            const CallArgs& args) {
  Rooted<PlainDateTimeWithCalendar> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());

  // Step 1. (Not applicable in our implementation.)

  // Step 2.
  Rooted<PlainDateTimeWithCalendar> other(cx);
  if (!::ToTemporalDateTime(cx, args.get(0), &other)) {
    return false;
  }

  // Step 3.
  if (!CalendarEqualsOrThrow(cx, dateTime.calendar(), other.calendar())) {
    return false;
  }

  // Steps 4-5.
  DifferenceSettings settings;
  Rooted<PlainObject*> resolvedOptions(cx);
  if (args.hasDefined(1)) {
    Rooted<JSObject*> options(
        cx, RequireObjectArg(cx, "options", ToName(operation), args[1]));
    if (!options) {
      return false;
    }

    // Step 4.
    resolvedOptions = SnapshotOwnProperties(cx, options);
    if (!resolvedOptions) {
      return false;
    }

    // Step 5.
    if (!GetDifferenceSettings(
            cx, operation, resolvedOptions, TemporalUnitGroup::DateTime,
            TemporalUnit::Nanosecond, TemporalUnit::Day, &settings)) {
      return false;
    }
  } else {
    // Steps 4-5.
    settings = {
        TemporalUnit::Nanosecond,
        TemporalUnit::Day,
        TemporalRoundingMode::Trunc,
        Increment{1},
    };
  }

  // Steps 6-7.
  bool datePartsIdentical = dateTime.date() == other.date();

  // Step 8.
  if (datePartsIdentical && dateTime.time() == other.time()) {
    auto* obj = CreateTemporalDuration(cx, {});
    if (!obj) {
      return false;
    }

    args.rval().setObject(*obj);
    return true;
  }

  // Step 9.
  Rooted<CalendarRecord> calendar(cx);
  if (!CreateCalendarMethodsRecord(cx, dateTime.calendar(),
                                   {
                                       CalendarMethod::DateAdd,
                                       CalendarMethod::DateUntil,
                                   },
                                   &calendar)) {
    return false;
  }

  // Step 10.
  Duration diff;
  if (!::DifferenceISODateTime(cx, dateTime, other, calendar,
                               settings.largestUnit, resolvedOptions, &diff)) {
    return false;
  }

  // Step 11.
  bool roundingGranularityIsNoop =
      settings.smallestUnit == TemporalUnit::Nanosecond &&
      settings.roundingIncrement == Increment{1};

  // Step 12.
  if (roundingGranularityIsNoop) {
    if (operation == TemporalDifference::Since) {
      diff = diff.negate();
    }

    auto* obj = CreateTemporalDuration(cx, diff);
    if (!obj) {
      return false;
    }

    args.rval().setObject(*obj);
    return true;
  }

  // Step 13.
  Rooted<PlainDateObject*> relativeTo(
      cx, CreateTemporalDate(cx, dateTime.date(), dateTime.calendar()));
  if (!relativeTo) {
    return false;
  }

  // Steps 14-15.
  Duration roundResult;
  if (!temporal::RoundDuration(cx, diff, settings.roundingIncrement,
                               settings.smallestUnit, settings.roundingMode,
                               relativeTo, calendar, &roundResult)) {
    return false;
  }

  // Step 16.
  TimeDuration result;
  if (!BalanceTimeDuration(cx, roundResult, settings.largestUnit, &result)) {
    return false;
  }

  // Step 17.
  auto toBalance = Duration{
      roundResult.years,
      roundResult.months,
      roundResult.weeks,
      result.days,
  };
  DateDuration balanceResult;
  if (!temporal::BalanceDateDurationRelative(
          cx, toBalance, settings.largestUnit, settings.smallestUnit,
          relativeTo, calendar, &balanceResult)) {
    return false;
  }

  // Step 18.
  Duration duration = {
      balanceResult.years, balanceResult.months, balanceResult.weeks,
      balanceResult.days,  result.hours,         result.minutes,
      result.seconds,      result.milliseconds,  result.microseconds,
      result.nanoseconds,
  };
  if (operation == TemporalDifference::Since) {
    duration = duration.negate();
  }

  auto* obj = CreateTemporalDuration(cx, duration);
  if (!obj) {
    return false;
  }

  args.rval().setObject(*obj);
  return true;
}

enum class PlainDateTimeDuration { Add, Subtract };

/**
 * AddDurationToOrSubtractDurationFromPlainDateTime ( operation, dateTime,
 * temporalDurationLike, options )
 */
static bool AddDurationToOrSubtractDurationFromPlainDateTime(
    JSContext* cx, PlainDateTimeDuration operation, const CallArgs& args) {
  Rooted<PlainDateTimeWithCalendar> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());

  // Step 1. (Not applicable in our implementation.)

  // Step 2.
  Duration duration;
  if (!ToTemporalDurationRecord(cx, args.get(0), &duration)) {
    return false;
  }

  // Step 3.
  Rooted<JSObject*> options(cx);
  if (args.hasDefined(1)) {
    const char* name =
        operation == PlainDateTimeDuration::Add ? "add" : "subtract";
    options = RequireObjectArg(cx, "options", name, args[1]);
  } else {
    options = NewPlainObjectWithProto(cx, nullptr);
  }
  if (!options) {
    return false;
  }

  // Step 4.
  Rooted<CalendarRecord> calendar(cx);
  if (!CreateCalendarMethodsRecord(cx, dateTime.calendar(),
                                   {
                                       CalendarMethod::DateAdd,
                                   },
                                   &calendar)) {
    return false;
  }

  // Step 5.
  if (operation == PlainDateTimeDuration::Subtract) {
    duration = duration.negate();
  }

  PlainDateTime result;
  if (!AddDateTime(cx, dateTime, calendar, duration, options, &result)) {
    return false;
  }

  // Steps 6-7.
  MOZ_ASSERT(IsValidISODateTime(result));

  // Step 8.
  auto* obj = CreateTemporalDateTime(cx, result, dateTime.calendar());
  if (!obj) {
    return false;
  }

  args.rval().setObject(*obj);
  return true;
}

/**
 * Temporal.PlainDateTime ( isoYear, isoMonth, isoDay [ , hour [ , minute [ ,
 * second [ , millisecond [ , microsecond [ , nanosecond [ , calendarLike ] ] ]
 * ] ] ] ] )
 */
static bool PlainDateTimeConstructor(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);

  // Step 1.
  if (!ThrowIfNotConstructing(cx, args, "Temporal.PlainDateTime")) {
    return false;
  }

  // Step 2.
  double isoYear;
  if (!ToIntegerWithTruncation(cx, args.get(0), "year", &isoYear)) {
    return false;
  }

  // Step 3.
  double isoMonth;
  if (!ToIntegerWithTruncation(cx, args.get(1), "month", &isoMonth)) {
    return false;
  }

  // Step 4.
  double isoDay;
  if (!ToIntegerWithTruncation(cx, args.get(2), "day", &isoDay)) {
    return false;
  }

  // Step 5.
  double hour = 0;
  if (args.hasDefined(3)) {
    if (!ToIntegerWithTruncation(cx, args[3], "hour", &hour)) {
      return false;
    }
  }

  // Step 6.
  double minute = 0;
  if (args.hasDefined(4)) {
    if (!ToIntegerWithTruncation(cx, args[4], "minute", &minute)) {
      return false;
    }
  }

  // Step 7.
  double second = 0;
  if (args.hasDefined(5)) {
    if (!ToIntegerWithTruncation(cx, args[5], "second", &second)) {
      return false;
    }
  }

  // Step 8.
  double millisecond = 0;
  if (args.hasDefined(6)) {
    if (!ToIntegerWithTruncation(cx, args[6], "millisecond", &millisecond)) {
      return false;
    }
  }

  // Step 9.
  double microsecond = 0;
  if (args.hasDefined(7)) {
    if (!ToIntegerWithTruncation(cx, args[7], "microsecond", &microsecond)) {
      return false;
    }
  }

  // Step 10.
  double nanosecond = 0;
  if (args.hasDefined(8)) {
    if (!ToIntegerWithTruncation(cx, args[8], "nanosecond", &nanosecond)) {
      return false;
    }
  }

  // Step 11.
  Rooted<CalendarValue> calendar(cx);
  if (!ToTemporalCalendarWithISODefault(cx, args.get(9), &calendar)) {
    return false;
  }

  // Step 12.
  auto* temporalDateTime = CreateTemporalDateTime(
      cx, args, isoYear, isoMonth, isoDay, hour, minute, second, millisecond,
      microsecond, nanosecond, calendar);
  if (!temporalDateTime) {
    return false;
  }

  args.rval().setObject(*temporalDateTime);
  return true;
}

/**
 * Temporal.PlainDateTime.from ( item [ , options ] )
 */
static bool PlainDateTime_from(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);

  // Step 1.
  Rooted<JSObject*> options(cx);
  if (args.hasDefined(1)) {
    options = RequireObjectArg(cx, "options", "from", args[1]);
    if (!options) {
      return false;
    }
  }

  // Step 2.
  if (args.get(0).isObject()) {
    JSObject* item = &args[0].toObject();
    if (auto* temporalDateTime = item->maybeUnwrapIf<PlainDateTimeObject>()) {
      auto dateTime = ToPlainDateTime(temporalDateTime);

      Rooted<CalendarValue> calendar(cx, temporalDateTime->calendar());
      if (!calendar.wrap(cx)) {
        return false;
      }

      if (options) {
        // Step 2.a.
        TemporalOverflow ignored;
        if (!ToTemporalOverflow(cx, options, &ignored)) {
          return false;
        }
      }

      // Step 2.b.
      auto* result = CreateTemporalDateTime(cx, dateTime, calendar);
      if (!result) {
        return false;
      }

      args.rval().setObject(*result);
      return true;
    }
  }

  // Step 3.
  auto result = ToTemporalDateTime(cx, args.get(0), options);
  if (!result) {
    return false;
  }

  args.rval().setObject(*result);
  return true;
}

/**
 * Temporal.PlainDateTime.compare ( one, two )
 */
static bool PlainDateTime_compare(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);

  // Step 1.
  PlainDateTime one;
  if (!ToTemporalDateTime(cx, args.get(0), &one)) {
    return false;
  }

  // Step 2.
  PlainDateTime two;
  if (!ToTemporalDateTime(cx, args.get(1), &two)) {
    return false;
  }

  // Step 3.
  args.rval().setInt32(CompareISODateTime(one, two));
  return true;
}

/**
 * get Temporal.PlainDateTime.prototype.calendarId
 */
static bool PlainDateTime_calendarId(JSContext* cx, const CallArgs& args) {
  auto* dateTime = &args.thisv().toObject().as<PlainDateTimeObject>();

  // Step 3.
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());
  auto* calendarId = ToTemporalCalendarIdentifier(cx, calendar);
  if (!calendarId) {
    return false;
  }

  args.rval().setString(calendarId);
  return true;
}

/**
 * get Temporal.PlainDateTime.prototype.calendarId
 */
static bool PlainDateTime_calendarId(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_calendarId>(cx,
                                                                         args);
}

/**
 * get Temporal.PlainDateTime.prototype.year
 */
static bool PlainDateTime_year(JSContext* cx, const CallArgs& args) {
  // Step 3.
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 4.
  return CalendarYear(cx, calendar, dateTime, args.rval());
}

/**
 * get Temporal.PlainDateTime.prototype.year
 */
static bool PlainDateTime_year(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_year>(cx, args);
}

/**
 * get Temporal.PlainDateTime.prototype.month
 */
static bool PlainDateTime_month(JSContext* cx, const CallArgs& args) {
  // Step 3.
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 4.
  return CalendarMonth(cx, calendar, dateTime, args.rval());
}

/**
 * get Temporal.PlainDateTime.prototype.month
 */
static bool PlainDateTime_month(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_month>(cx, args);
}

/**
 * get Temporal.PlainDateTime.prototype.monthCode
 */
static bool PlainDateTime_monthCode(JSContext* cx, const CallArgs& args) {
  // Step 3.
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 4.
  return CalendarMonthCode(cx, calendar, dateTime, args.rval());
}

/**
 * get Temporal.PlainDateTime.prototype.monthCode
 */
static bool PlainDateTime_monthCode(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_monthCode>(cx,
                                                                        args);
}

/**
 * get Temporal.PlainDateTime.prototype.day
 */
static bool PlainDateTime_day(JSContext* cx, const CallArgs& args) {
  // Step 3.
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 4.
  return CalendarDay(cx, calendar, dateTime, args.rval());
}

/**
 * get Temporal.PlainDateTime.prototype.day
 */
static bool PlainDateTime_day(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_day>(cx, args);
}

/**
 * get Temporal.PlainDateTime.prototype.hour
 */
static bool PlainDateTime_hour(JSContext* cx, const CallArgs& args) {
  // Step 3.
  auto* dateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  args.rval().setInt32(dateTime->isoHour());
  return true;
}

/**
 * get Temporal.PlainDateTime.prototype.hour
 */
static bool PlainDateTime_hour(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_hour>(cx, args);
}

/**
 * get Temporal.PlainDateTime.prototype.minute
 */
static bool PlainDateTime_minute(JSContext* cx, const CallArgs& args) {
  // Step 3.
  auto* dateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  args.rval().setInt32(dateTime->isoMinute());
  return true;
}

/**
 * get Temporal.PlainDateTime.prototype.minute
 */
static bool PlainDateTime_minute(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_minute>(cx, args);
}

/**
 * get Temporal.PlainDateTime.prototype.second
 */
static bool PlainDateTime_second(JSContext* cx, const CallArgs& args) {
  // Step 3.
  auto* dateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  args.rval().setInt32(dateTime->isoSecond());
  return true;
}

/**
 * get Temporal.PlainDateTime.prototype.second
 */
static bool PlainDateTime_second(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_second>(cx, args);
}

/**
 * get Temporal.PlainDateTime.prototype.millisecond
 */
static bool PlainDateTime_millisecond(JSContext* cx, const CallArgs& args) {
  // Step 3.
  auto* dateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  args.rval().setInt32(dateTime->isoMillisecond());
  return true;
}

/**
 * get Temporal.PlainDateTime.prototype.millisecond
 */
static bool PlainDateTime_millisecond(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_millisecond>(cx,
                                                                          args);
}

/**
 * get Temporal.PlainDateTime.prototype.microsecond
 */
static bool PlainDateTime_microsecond(JSContext* cx, const CallArgs& args) {
  // Step 3.
  auto* dateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  args.rval().setInt32(dateTime->isoMicrosecond());
  return true;
}

/**
 * get Temporal.PlainDateTime.prototype.microsecond
 */
static bool PlainDateTime_microsecond(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_microsecond>(cx,
                                                                          args);
}

/**
 * get Temporal.PlainDateTime.prototype.nanosecond
 */
static bool PlainDateTime_nanosecond(JSContext* cx, const CallArgs& args) {
  // Step 3.
  auto* dateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  args.rval().setInt32(dateTime->isoNanosecond());
  return true;
}

/**
 * get Temporal.PlainDateTime.prototype.nanosecond
 */
static bool PlainDateTime_nanosecond(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_nanosecond>(cx,
                                                                         args);
}

/**
 * get Temporal.PlainDateTime.prototype.dayOfWeek
 */
static bool PlainDateTime_dayOfWeek(JSContext* cx, const CallArgs& args) {
  // Step 3.
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 4.
  return CalendarDayOfWeek(cx, calendar, dateTime, args.rval());
}

/**
 * get Temporal.PlainDateTime.prototype.dayOfWeek
 */
static bool PlainDateTime_dayOfWeek(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_dayOfWeek>(cx,
                                                                        args);
}

/**
 * get Temporal.PlainDateTime.prototype.dayOfYear
 */
static bool PlainDateTime_dayOfYear(JSContext* cx, const CallArgs& args) {
  // Step 3.
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 4.
  return CalendarDayOfYear(cx, calendar, dateTime, args.rval());
}

/**
 * get Temporal.PlainDateTime.prototype.dayOfYear
 */
static bool PlainDateTime_dayOfYear(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_dayOfYear>(cx,
                                                                        args);
}

/**
 * get Temporal.PlainDateTime.prototype.weekOfYear
 */
static bool PlainDateTime_weekOfYear(JSContext* cx, const CallArgs& args) {
  // Step 3.
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 4.
  return CalendarWeekOfYear(cx, calendar, dateTime, args.rval());
}

/**
 * get Temporal.PlainDateTime.prototype.weekOfYear
 */
static bool PlainDateTime_weekOfYear(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_weekOfYear>(cx,
                                                                         args);
}

/**
 * get Temporal.PlainDateTime.prototype.yearOfWeek
 */
static bool PlainDateTime_yearOfWeek(JSContext* cx, const CallArgs& args) {
  // Step 3.
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 4.
  return CalendarYearOfWeek(cx, calendar, dateTime, args.rval());
}

/**
 * get Temporal.PlainDateTime.prototype.yearOfWeek
 */
static bool PlainDateTime_yearOfWeek(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_yearOfWeek>(cx,
                                                                         args);
}

/**
 * get Temporal.PlainDateTime.prototype.daysInWeek
 */
static bool PlainDateTime_daysInWeek(JSContext* cx, const CallArgs& args) {
  // Step 3.
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 4.
  return CalendarDaysInWeek(cx, calendar, dateTime, args.rval());
}

/**
 * get Temporal.PlainDateTime.prototype.daysInWeek
 */
static bool PlainDateTime_daysInWeek(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_daysInWeek>(cx,
                                                                         args);
}

/**
 * get Temporal.PlainDateTime.prototype.daysInMonth
 */
static bool PlainDateTime_daysInMonth(JSContext* cx, const CallArgs& args) {
  // Step 3.
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 4.
  return CalendarDaysInMonth(cx, calendar, dateTime, args.rval());
}

/**
 * get Temporal.PlainDateTime.prototype.daysInMonth
 */
static bool PlainDateTime_daysInMonth(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_daysInMonth>(cx,
                                                                          args);
}

/**
 * get Temporal.PlainDateTime.prototype.daysInYear
 */
static bool PlainDateTime_daysInYear(JSContext* cx, const CallArgs& args) {
  // Step 3.
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 4.
  return CalendarDaysInYear(cx, calendar, dateTime, args.rval());
}

/**
 * get Temporal.PlainDateTime.prototype.daysInYear
 */
static bool PlainDateTime_daysInYear(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_daysInYear>(cx,
                                                                         args);
}

/**
 * get Temporal.PlainDateTime.prototype.monthsInYear
 */
static bool PlainDateTime_monthsInYear(JSContext* cx, const CallArgs& args) {
  // Step 3.
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 4.
  return CalendarMonthsInYear(cx, calendar, dateTime, args.rval());
}

/**
 * get Temporal.PlainDateTime.prototype.monthsInYear
 */
static bool PlainDateTime_monthsInYear(JSContext* cx, unsigned argc,
                                       Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_monthsInYear>(
      cx, args);
}

/**
 * get Temporal.PlainDateTime.prototype.inLeapYear
 */
static bool PlainDateTime_inLeapYear(JSContext* cx, const CallArgs& args) {
  // Step 3.
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 4.
  return CalendarInLeapYear(cx, calendar, dateTime, args.rval());
}

/**
 * get Temporal.PlainDateTime.prototype.inLeapYear
 */
static bool PlainDateTime_inLeapYear(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_inLeapYear>(cx,
                                                                         args);
}

/**
 * Temporal.PlainDateTime.prototype.with ( temporalDateTimeLike [ , options ] )
 */
static bool PlainDateTime_with(JSContext* cx, const CallArgs& args) {
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());

  // Step 3.
  Rooted<JSObject*> temporalDateTimeLike(
      cx, RequireObjectArg(cx, "temporalDateTimeLike", "with", args.get(0)));
  if (!temporalDateTimeLike) {
    return false;
  }

  // Step 4.
  if (!RejectTemporalLikeObject(cx, temporalDateTimeLike)) {
    return false;
  }

  // Step 5.
  Rooted<PlainObject*> resolvedOptions(cx);
  if (args.hasDefined(1)) {
    Rooted<JSObject*> options(cx,
                              RequireObjectArg(cx, "options", "with", args[1]));
    if (!options) {
      return false;
    }
    resolvedOptions = SnapshotOwnProperties(cx, options);
  } else {
    resolvedOptions = NewPlainObjectWithProto(cx, nullptr);
  }
  if (!resolvedOptions) {
    return false;
  }

  // Step 6.
  Rooted<CalendarValue> calendarValue(cx, dateTime->calendar());
  Rooted<CalendarRecord> calendar(cx);
  if (!CreateCalendarMethodsRecord(cx, calendarValue,
                                   {
                                       CalendarMethod::DateFromFields,
                                       CalendarMethod::Fields,
                                       CalendarMethod::MergeFields,
                                   },
                                   &calendar)) {
    return false;
  }

  // Step 7.
  JS::RootedVector<PropertyKey> fieldNames(cx);
  if (!CalendarFields(cx, calendar,
                      {CalendarField::Day, CalendarField::Month,
                       CalendarField::MonthCode, CalendarField::Year},
                      &fieldNames)) {
    return false;
  }

  // Step 8.
  Rooted<PlainObject*> fields(cx,
                              PrepareTemporalFields(cx, dateTime, fieldNames));
  if (!fields) {
    return false;
  }

  // Steps 9-14.
  struct TimeField {
    using FieldName = ImmutableTenuredPtr<PropertyName*> JSAtomState::*;

    FieldName name;
    int32_t value;
  } timeFields[] = {
      {&JSAtomState::hour, dateTime->isoHour()},
      {&JSAtomState::minute, dateTime->isoMinute()},
      {&JSAtomState::second, dateTime->isoSecond()},
      {&JSAtomState::millisecond, dateTime->isoMillisecond()},
      {&JSAtomState::microsecond, dateTime->isoMicrosecond()},
      {&JSAtomState::nanosecond, dateTime->isoNanosecond()},
  };

  Rooted<Value> timeFieldValue(cx);
  for (const auto& timeField : timeFields) {
    Handle<PropertyName*> name = cx->names().*(timeField.name);
    timeFieldValue.setInt32(timeField.value);

    if (!DefineDataProperty(cx, fields, name, timeFieldValue)) {
      return false;
    }
  }

  // Step 15.
  if (!AppendSorted(cx, fieldNames.get(),
                    {
                        TemporalField::Hour,
                        TemporalField::Microsecond,
                        TemporalField::Millisecond,
                        TemporalField::Minute,
                        TemporalField::Nanosecond,
                        TemporalField::Second,
                    })) {
    return false;
  }

  // Step 16.
  Rooted<PlainObject*> partialDateTime(
      cx, PreparePartialTemporalFields(cx, temporalDateTimeLike, fieldNames));
  if (!partialDateTime) {
    return false;
  }

  // Step 17.
  Rooted<JSObject*> mergedFields(
      cx, CalendarMergeFields(cx, calendar, fields, partialDateTime));
  if (!mergedFields) {
    return false;
  }

  // Step 18.
  fields = PrepareTemporalFields(cx, mergedFields, fieldNames);
  if (!fields) {
    return false;
  }

  // Step 19.
  PlainDateTime result;
  if (!InterpretTemporalDateTimeFields(cx, calendar, fields, resolvedOptions,
                                       &result)) {
    return false;
  }

  // Steps 20-21.
  MOZ_ASSERT(IsValidISODateTime(result));

  // Step 22.
  auto* obj = CreateTemporalDateTime(cx, result, calendar.receiver());
  if (!obj) {
    return false;
  }

  args.rval().setObject(*obj);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.with ( temporalDateTimeLike [ , options ] )
 */
static bool PlainDateTime_with(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_with>(cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.withPlainTime ( [ plainTimeLike ] )
 */
static bool PlainDateTime_withPlainTime(JSContext* cx, const CallArgs& args) {
  auto* temporalDateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  auto date = ToPlainDate(temporalDateTime);
  Rooted<CalendarValue> calendar(cx, temporalDateTime->calendar());

  // Step 4.
  PlainTime time = {};
  if (args.hasDefined(0)) {
    if (!ToTemporalTime(cx, args[0], &time)) {
      return false;
    }
  }

  // Steps 3 and 5.
  auto* obj = CreateTemporalDateTime(cx, {date, time}, calendar);
  if (!obj) {
    return false;
  }

  args.rval().setObject(*obj);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.withPlainTime ( [ plainTimeLike ] )
 */
static bool PlainDateTime_withPlainTime(JSContext* cx, unsigned argc,
                                        Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_withPlainTime>(
      cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.withPlainDate ( plainDateLike )
 */
static bool PlainDateTime_withPlainDate(JSContext* cx, const CallArgs& args) {
  auto* temporalDateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  auto time = ToPlainTime(temporalDateTime);
  Rooted<CalendarValue> calendar(cx, temporalDateTime->calendar());

  // Step 3.
  Rooted<PlainDateWithCalendar> plainDate(cx);
  if (!ToTemporalDate(cx, args.get(0), &plainDate)) {
    return false;
  }
  auto date = plainDate.date();

  // Step 4.
  if (!ConsolidateCalendars(cx, calendar, plainDate.calendar(), &calendar)) {
    return false;
  }

  // Step 5.
  auto* obj = CreateTemporalDateTime(cx, {date, time}, calendar);
  if (!obj) {
    return false;
  }

  args.rval().setObject(*obj);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.withPlainDate ( plainDateLike )
 */
static bool PlainDateTime_withPlainDate(JSContext* cx, unsigned argc,
                                        Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_withPlainDate>(
      cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.withCalendar ( calendar )
 */
static bool PlainDateTime_withCalendar(JSContext* cx, const CallArgs& args) {
  auto* temporalDateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  auto dateTime = ToPlainDateTime(temporalDateTime);

  // Step 3.
  Rooted<CalendarValue> calendar(cx);
  if (!ToTemporalCalendar(cx, args.get(0), &calendar)) {
    return false;
  }

  // Step 4.
  auto* result = CreateTemporalDateTime(cx, dateTime, calendar);
  if (!result) {
    return false;
  }

  args.rval().setObject(*result);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.withCalendar ( calendar )
 */
static bool PlainDateTime_withCalendar(JSContext* cx, unsigned argc,
                                       Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_withCalendar>(
      cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.add ( temporalDurationLike [ , options ] )
 */
static bool PlainDateTime_add(JSContext* cx, const CallArgs& args) {
  // Step 3.
  return AddDurationToOrSubtractDurationFromPlainDateTime(
      cx, PlainDateTimeDuration::Add, args);
}

/**
 * Temporal.PlainDateTime.prototype.add ( temporalDurationLike [ , options ] )
 */
static bool PlainDateTime_add(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_add>(cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.subtract ( temporalDurationLike [ , options
 * ] )
 */
static bool PlainDateTime_subtract(JSContext* cx, const CallArgs& args) {
  // Step 3.
  return AddDurationToOrSubtractDurationFromPlainDateTime(
      cx, PlainDateTimeDuration::Subtract, args);
}

/**
 * Temporal.PlainDateTime.prototype.subtract ( temporalDurationLike [ , options
 * ] )
 */
static bool PlainDateTime_subtract(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_subtract>(cx,
                                                                       args);
}

/**
 * Temporal.PlainDateTime.prototype.until ( other [ , options ] )
 */
static bool PlainDateTime_until(JSContext* cx, const CallArgs& args) {
  // Step 3.
  return DifferenceTemporalPlainDateTime(cx, TemporalDifference::Until, args);
}

/**
 * Temporal.PlainDateTime.prototype.until ( other [ , options ] )
 */
static bool PlainDateTime_until(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_until>(cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.since ( other [ , options ] )
 */
static bool PlainDateTime_since(JSContext* cx, const CallArgs& args) {
  // Step 3.
  return DifferenceTemporalPlainDateTime(cx, TemporalDifference::Since, args);
}

/**
 * Temporal.PlainDateTime.prototype.since ( other [ , options ] )
 */
static bool PlainDateTime_since(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_since>(cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.round ( roundTo )
 */
static bool PlainDateTime_round(JSContext* cx, const CallArgs& args) {
  auto* temporalDateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  auto dateTime = ToPlainDateTime(temporalDateTime);
  Rooted<CalendarValue> calendar(cx, temporalDateTime->calendar());

  // Steps 3-12.
  auto smallestUnit = TemporalUnit::Auto;
  auto roundingMode = TemporalRoundingMode::HalfExpand;
  auto roundingIncrement = Increment{1};
  if (args.get(0).isString()) {
    // Step 4. (Not applicable in our implementation.)

    // Step 9.
    Rooted<JSString*> paramString(cx, args[0].toString());
    if (!GetTemporalUnit(cx, paramString, TemporalUnitKey::SmallestUnit,
                         TemporalUnitGroup::DayTime, &smallestUnit)) {
      return false;
    }

    MOZ_ASSERT(TemporalUnit::Day <= smallestUnit &&
               smallestUnit <= TemporalUnit::Nanosecond);

    // Steps 6-8 and 10-12. (Implicit)
  } else {
    // Steps 3 and 5.
    Rooted<JSObject*> roundTo(
        cx, RequireObjectArg(cx, "roundTo", "round", args.get(0)));
    if (!roundTo) {
      return false;
    }

    // Steps 6-7.
    if (!ToTemporalRoundingIncrement(cx, roundTo, &roundingIncrement)) {
      return false;
    }

    // Step 8.
    if (!ToTemporalRoundingMode(cx, roundTo, &roundingMode)) {
      return false;
    }

    // Step 9.
    if (!GetTemporalUnit(cx, roundTo, TemporalUnitKey::SmallestUnit,
                         TemporalUnitGroup::DayTime, &smallestUnit)) {
      return false;
    }

    if (smallestUnit == TemporalUnit::Auto) {
      JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                                JSMSG_TEMPORAL_MISSING_OPTION, "smallestUnit");
      return false;
    }

    MOZ_ASSERT(TemporalUnit::Day <= smallestUnit &&
               smallestUnit <= TemporalUnit::Nanosecond);

    // Steps 10-11.
    auto maximum = Increment{1};
    bool inclusive = true;
    if (smallestUnit > TemporalUnit::Day) {
      maximum = MaximumTemporalDurationRoundingIncrement(smallestUnit);
      inclusive = false;
    }

    // Step 12.
    if (!ValidateTemporalRoundingIncrement(cx, roundingIncrement, maximum,
                                           inclusive)) {
      return false;
    }
  }

  // Step 13.
  if (smallestUnit == TemporalUnit::Nanosecond &&
      roundingIncrement == Increment{1}) {
    auto* obj = CreateTemporalDateTime(cx, dateTime, calendar);
    if (!obj) {
      return false;
    }

    args.rval().setObject(*obj);
    return true;
  }

  // Step 14.
  auto result =
      RoundISODateTime(dateTime, roundingIncrement, smallestUnit, roundingMode);

  // Step 15.
  auto* obj = CreateTemporalDateTime(cx, result, calendar);
  if (!obj) {
    return false;
  }

  args.rval().setObject(*obj);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.round ( roundTo )
 */
static bool PlainDateTime_round(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_round>(cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.equals ( other )
 */
static bool PlainDateTime_equals(JSContext* cx, const CallArgs& args) {
  auto* temporalDateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  auto dateTime = ToPlainDateTime(temporalDateTime);
  Rooted<CalendarValue> calendar(cx, temporalDateTime->calendar());

  // Step 3.
  Rooted<PlainDateTimeWithCalendar> other(cx);
  if (!::ToTemporalDateTime(cx, args.get(0), &other)) {
    return false;
  }

  // Steps 4-13.
  bool equals = dateTime == other.dateTime();
  if (equals && !CalendarEquals(cx, calendar, other.calendar(), &equals)) {
    return false;
  }

  args.rval().setBoolean(equals);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.equals ( other )
 */
static bool PlainDateTime_equals(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_equals>(cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.toString ( [ options ] )
 */
static bool PlainDateTime_toString(JSContext* cx, const CallArgs& args) {
  auto* dateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  auto dt = ToPlainDateTime(dateTime);
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  SecondsStringPrecision precision = {Precision::Auto(),
                                      TemporalUnit::Nanosecond, Increment{1}};
  auto roundingMode = TemporalRoundingMode::Trunc;
  auto showCalendar = CalendarOption::Auto;
  if (args.hasDefined(0)) {
    // Step 3.
    Rooted<JSObject*> options(
        cx, RequireObjectArg(cx, "options", "toString", args[0]));
    if (!options) {
      return false;
    }

    // Steps 4-5.
    if (!ToCalendarNameOption(cx, options, &showCalendar)) {
      return false;
    }

    // Step 6.
    auto digits = Precision::Auto();
    if (!ToFractionalSecondDigits(cx, options, &digits)) {
      return false;
    }

    // Step 7.
    if (!ToTemporalRoundingMode(cx, options, &roundingMode)) {
      return false;
    }

    // Step 8.
    auto smallestUnit = TemporalUnit::Auto;
    if (!GetTemporalUnit(cx, options, TemporalUnitKey::SmallestUnit,
                         TemporalUnitGroup::Time, &smallestUnit)) {
      return false;
    }

    // Step 9.
    if (smallestUnit == TemporalUnit::Hour) {
      JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                                JSMSG_TEMPORAL_INVALID_UNIT_OPTION, "hour",
                                "smallestUnit");
      return false;
    }

    // Step 10.
    precision = ToSecondsStringPrecision(smallestUnit, digits);
  }

  // Step 11.
  auto result =
      RoundISODateTime(dt, precision.increment, precision.unit, roundingMode);

  // Step 12.
  JSString* str = ::TemporalDateTimeToString(cx, result, calendar,
                                             precision.precision, showCalendar);
  if (!str) {
    return false;
  }

  args.rval().setString(str);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.toString ( [ options ] )
 */
static bool PlainDateTime_toString(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_toString>(cx,
                                                                       args);
}

/**
 * Temporal.PlainDateTime.prototype.toLocaleString ( [ locales [ , options ] ] )
 */
static bool PlainDateTime_toLocaleString(JSContext* cx, const CallArgs& args) {
  auto* dateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  auto dt = ToPlainDateTime(dateTime);
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 3.
  JSString* str = ::TemporalDateTimeToString(
      cx, dt, calendar, Precision::Auto(), CalendarOption::Auto);
  if (!str) {
    return false;
  }

  args.rval().setString(str);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.toLocaleString ( [ locales [ , options ] ] )
 */
static bool PlainDateTime_toLocaleString(JSContext* cx, unsigned argc,
                                         Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_toLocaleString>(
      cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.toJSON ( )
 */
static bool PlainDateTime_toJSON(JSContext* cx, const CallArgs& args) {
  auto* dateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  auto dt = ToPlainDateTime(dateTime);
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 3.
  JSString* str = ::TemporalDateTimeToString(
      cx, dt, calendar, Precision::Auto(), CalendarOption::Auto);
  if (!str) {
    return false;
  }

  args.rval().setString(str);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.toJSON ( )
 */
static bool PlainDateTime_toJSON(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_toJSON>(cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.valueOf ( )
 */
static bool PlainDateTime_valueOf(JSContext* cx, unsigned argc, Value* vp) {
  JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_CANT_CONVERT_TO,
                            "PlainDateTime", "primitive type");
  return false;
}

/**
 * Temporal.PlainDateTime.prototype.getISOFields ( )
 */
static bool PlainDateTime_getISOFields(JSContext* cx, const CallArgs& args) {
  auto* temporalDateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  auto dateTime = ToPlainDateTime(temporalDateTime);
  auto calendar = temporalDateTime->calendar();

  // Step 3.
  Rooted<IdValueVector> fields(cx, IdValueVector(cx));

  // Step 4.
  if (!fields.emplaceBack(NameToId(cx->names().calendar), calendar.toValue())) {
    return false;
  }

  // Step 5.
  if (!fields.emplaceBack(NameToId(cx->names().isoDay),
                          Int32Value(dateTime.date.day))) {
    return false;
  }

  // Step 6.
  if (!fields.emplaceBack(NameToId(cx->names().isoHour),
                          Int32Value(dateTime.time.hour))) {
    return false;
  }

  // Step 7.
  if (!fields.emplaceBack(NameToId(cx->names().isoMicrosecond),
                          Int32Value(dateTime.time.microsecond))) {
    return false;
  }

  // Step 8.
  if (!fields.emplaceBack(NameToId(cx->names().isoMillisecond),
                          Int32Value(dateTime.time.millisecond))) {
    return false;
  }

  // Step 9.
  if (!fields.emplaceBack(NameToId(cx->names().isoMinute),
                          Int32Value(dateTime.time.minute))) {
    return false;
  }

  // Step 10.
  if (!fields.emplaceBack(NameToId(cx->names().isoMonth),
                          Int32Value(dateTime.date.month))) {
    return false;
  }

  // Step 11.
  if (!fields.emplaceBack(NameToId(cx->names().isoNanosecond),
                          Int32Value(dateTime.time.nanosecond))) {
    return false;
  }

  // Step 12.
  if (!fields.emplaceBack(NameToId(cx->names().isoSecond),
                          Int32Value(dateTime.time.second))) {
    return false;
  }

  // Step 13.
  if (!fields.emplaceBack(NameToId(cx->names().isoYear),
                          Int32Value(dateTime.date.year))) {
    return false;
  }

  // Step 14.
  auto* obj = NewPlainObjectWithUniqueNames(cx, fields);
  if (!obj) {
    return false;
  }

  args.rval().setObject(*obj);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.getISOFields ( )
 */
static bool PlainDateTime_getISOFields(JSContext* cx, unsigned argc,
                                       Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_getISOFields>(
      cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.getCalendar ( )
 */
static bool PlainDateTime_getCalendar(JSContext* cx, const CallArgs& args) {
  auto* temporalDateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  Rooted<CalendarValue> calendar(cx, temporalDateTime->calendar());

  // Step 3.
  auto* obj = ToTemporalCalendarObject(cx, calendar);
  if (!obj) {
    return false;
  }

  args.rval().setObject(*obj);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.getCalendar ( )
 */
static bool PlainDateTime_getCalendar(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_getCalendar>(cx,
                                                                          args);
}

/**
 * Temporal.PlainDateTime.prototype.toZonedDateTime ( temporalTimeZoneLike [ ,
 * options ] )
 */
static bool PlainDateTime_toZonedDateTime(JSContext* cx, const CallArgs& args) {
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 3.
  Rooted<TimeZoneValue> timeZone(cx);
  if (!ToTemporalTimeZone(cx, args.get(0), &timeZone)) {
    return false;
  }

  auto disambiguation = TemporalDisambiguation::Compatible;
  if (args.hasDefined(1)) {
    // Step 4.
    Rooted<JSObject*> options(
        cx, RequireObjectArg(cx, "options", "toZonedDateTime", args[1]));
    if (!options) {
      return false;
    }

    // Step 5.
    if (!ToTemporalDisambiguation(cx, options, &disambiguation)) {
      return false;
    }
  }

  // Steps 6-7.
  Instant instant;
  if (!GetInstantFor(cx, timeZone, dateTime, disambiguation, &instant)) {
    return false;
  }

  // Step 8.
  auto* result = CreateTemporalZonedDateTime(cx, instant, timeZone, calendar);
  if (!result) {
    return false;
  }

  args.rval().setObject(*result);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.toZonedDateTime ( temporalTimeZoneLike [ ,
 * options ] )
 */
static bool PlainDateTime_toZonedDateTime(JSContext* cx, unsigned argc,
                                          Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_toZonedDateTime>(
      cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.toPlainDate ( )
 */
static bool PlainDateTime_toPlainDate(JSContext* cx, const CallArgs& args) {
  auto* dateTime = &args.thisv().toObject().as<PlainDateTimeObject>();
  Rooted<CalendarValue> calendar(cx, dateTime->calendar());

  // Step 3.
  auto* obj = CreateTemporalDate(cx, ToPlainDate(dateTime), calendar);
  if (!obj) {
    return false;
  }

  args.rval().setObject(*obj);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.toPlainDate ( )
 */
static bool PlainDateTime_toPlainDate(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_toPlainDate>(cx,
                                                                          args);
}

/**
 * Temporal.PlainDateTime.prototype.toPlainYearMonth ( )
 */
static bool PlainDateTime_toPlainYearMonth(JSContext* cx,
                                           const CallArgs& args) {
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendarValue(cx, dateTime->calendar());

  // Step 3.
  Rooted<CalendarRecord> calendar(cx);
  if (!CreateCalendarMethodsRecord(cx, calendarValue,
                                   {
                                       CalendarMethod::Fields,
                                       CalendarMethod::YearMonthFromFields,
                                   },
                                   &calendar)) {
    return false;
  }

  // Step 4.
  JS::RootedVector<PropertyKey> fieldNames(cx);
  if (!CalendarFields(cx, calendar,
                      {CalendarField::MonthCode, CalendarField::Year},
                      &fieldNames)) {
    return false;
  }

  // Step 4.
  Rooted<PlainObject*> fields(cx,
                              PrepareTemporalFields(cx, dateTime, fieldNames));
  if (!fields) {
    return false;
  }

  // Step 5.
  auto obj = CalendarYearMonthFromFields(cx, calendar, fields);
  if (!obj) {
    return false;
  }

  args.rval().setObject(*obj);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.toPlainYearMonth ( )
 */
static bool PlainDateTime_toPlainYearMonth(JSContext* cx, unsigned argc,
                                           Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_toPlainYearMonth>(
      cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.toPlainMonthDay ( )
 */
static bool PlainDateTime_toPlainMonthDay(JSContext* cx, const CallArgs& args) {
  Rooted<PlainDateTimeObject*> dateTime(
      cx, &args.thisv().toObject().as<PlainDateTimeObject>());
  Rooted<CalendarValue> calendarValue(cx, dateTime->calendar());

  // Step 3.
  Rooted<CalendarRecord> calendar(cx);
  if (!CreateCalendarMethodsRecord(cx, calendarValue,
                                   {
                                       CalendarMethod::Fields,
                                       CalendarMethod::MonthDayFromFields,
                                   },
                                   &calendar)) {
    return false;
  }

  // Step 4.
  JS::RootedVector<PropertyKey> fieldNames(cx);
  if (!CalendarFields(cx, calendar,
                      {CalendarField::Day, CalendarField::MonthCode},
                      &fieldNames)) {
    return false;
  }

  // Step 5.
  Rooted<PlainObject*> fields(cx,
                              PrepareTemporalFields(cx, dateTime, fieldNames));
  if (!fields) {
    return false;
  }

  // Steps 6-7.
  auto obj = CalendarMonthDayFromFields(cx, calendar, fields);
  if (!obj) {
    return false;
  }

  args.rval().setObject(*obj);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.toPlainMonthDay ( )
 */
static bool PlainDateTime_toPlainMonthDay(JSContext* cx, unsigned argc,
                                          Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_toPlainMonthDay>(
      cx, args);
}

/**
 * Temporal.PlainDateTime.prototype.toPlainTime ( )
 */
static bool PlainDateTime_toPlainTime(JSContext* cx, const CallArgs& args) {
  auto* dateTime = &args.thisv().toObject().as<PlainDateTimeObject>();

  // Step 3.
  auto* obj = CreateTemporalTime(cx, ToPlainTime(dateTime));
  if (!obj) {
    return false;
  }

  args.rval().setObject(*obj);
  return true;
}

/**
 * Temporal.PlainDateTime.prototype.toPlainTime ( )
 */
static bool PlainDateTime_toPlainTime(JSContext* cx, unsigned argc, Value* vp) {
  // Steps 1-2.
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsPlainDateTime, PlainDateTime_toPlainTime>(cx,
                                                                          args);
}

const JSClass PlainDateTimeObject::class_ = {
    "Temporal.PlainDateTime",
    JSCLASS_HAS_RESERVED_SLOTS(PlainDateTimeObject::SLOT_COUNT) |
        JSCLASS_HAS_CACHED_PROTO(JSProto_PlainDateTime),
    JS_NULL_CLASS_OPS,
    &PlainDateTimeObject::classSpec_,
};

const JSClass& PlainDateTimeObject::protoClass_ = PlainObject::class_;

static const JSFunctionSpec PlainDateTime_methods[] = {
    JS_FN("from", PlainDateTime_from, 1, 0),
    JS_FN("compare", PlainDateTime_compare, 2, 0),
    JS_FS_END,
};

static const JSFunctionSpec PlainDateTime_prototype_methods[] = {
    JS_FN("with", PlainDateTime_with, 1, 0),
    JS_FN("withPlainTime", PlainDateTime_withPlainTime, 0, 0),
    JS_FN("withPlainDate", PlainDateTime_withPlainDate, 1, 0),
    JS_FN("withCalendar", PlainDateTime_withCalendar, 1, 0),
    JS_FN("add", PlainDateTime_add, 1, 0),
    JS_FN("subtract", PlainDateTime_subtract, 1, 0),
    JS_FN("until", PlainDateTime_until, 1, 0),
    JS_FN("since", PlainDateTime_since, 1, 0),
    JS_FN("round", PlainDateTime_round, 1, 0),
    JS_FN("equals", PlainDateTime_equals, 1, 0),
    JS_FN("toString", PlainDateTime_toString, 0, 0),
    JS_FN("toLocaleString", PlainDateTime_toLocaleString, 0, 0),
    JS_FN("toJSON", PlainDateTime_toJSON, 0, 0),
    JS_FN("valueOf", PlainDateTime_valueOf, 0, 0),
    JS_FN("toZonedDateTime", PlainDateTime_toZonedDateTime, 1, 0),
    JS_FN("toPlainDate", PlainDateTime_toPlainDate, 0, 0),
    JS_FN("toPlainYearMonth", PlainDateTime_toPlainYearMonth, 0, 0),
    JS_FN("toPlainMonthDay", PlainDateTime_toPlainMonthDay, 0, 0),
    JS_FN("toPlainTime", PlainDateTime_toPlainTime, 0, 0),
    JS_FN("getISOFields", PlainDateTime_getISOFields, 0, 0),
    JS_FN("getCalendar", PlainDateTime_getCalendar, 0, 0),
    JS_FS_END,
};

static const JSPropertySpec PlainDateTime_prototype_properties[] = {
    JS_PSG("calendarId", PlainDateTime_calendarId, 0),
    JS_PSG("year", PlainDateTime_year, 0),
    JS_PSG("month", PlainDateTime_month, 0),
    JS_PSG("monthCode", PlainDateTime_monthCode, 0),
    JS_PSG("day", PlainDateTime_day, 0),
    JS_PSG("hour", PlainDateTime_hour, 0),
    JS_PSG("minute", PlainDateTime_minute, 0),
    JS_PSG("second", PlainDateTime_second, 0),
    JS_PSG("millisecond", PlainDateTime_millisecond, 0),
    JS_PSG("microsecond", PlainDateTime_microsecond, 0),
    JS_PSG("nanosecond", PlainDateTime_nanosecond, 0),
    JS_PSG("dayOfWeek", PlainDateTime_dayOfWeek, 0),
    JS_PSG("dayOfYear", PlainDateTime_dayOfYear, 0),
    JS_PSG("weekOfYear", PlainDateTime_weekOfYear, 0),
    JS_PSG("yearOfWeek", PlainDateTime_yearOfWeek, 0),
    JS_PSG("daysInWeek", PlainDateTime_daysInWeek, 0),
    JS_PSG("daysInMonth", PlainDateTime_daysInMonth, 0),
    JS_PSG("daysInYear", PlainDateTime_daysInYear, 0),
    JS_PSG("monthsInYear", PlainDateTime_monthsInYear, 0),
    JS_PSG("inLeapYear", PlainDateTime_inLeapYear, 0),
    JS_STRING_SYM_PS(toStringTag, "Temporal.PlainDateTime", JSPROP_READONLY),
    JS_PS_END,
};

const ClassSpec PlainDateTimeObject::classSpec_ = {
    GenericCreateConstructor<PlainDateTimeConstructor, 3,
                             gc::AllocKind::FUNCTION>,
    GenericCreatePrototype<PlainDateTimeObject>,
    PlainDateTime_methods,
    nullptr,
    PlainDateTime_prototype_methods,
    PlainDateTime_prototype_properties,
    nullptr,
    ClassSpec::DontDefineConstructor,
};