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* Copyright 2020 Adobe. All rights reserved.\n * This file is licensed to you under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License. You may obtain a copy\n * of the License at http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software distributed under\n * the License is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS\n * OF ANY KIND, either express or implied. See the License for the specific language\n * governing permissions and limitations under the License.\n */\n\nimport {AnyCalendarDate, AnyDateTime, AnyTime, CycleOptions, CycleTimeOptions, DateDuration, DateField, DateFields, DateTimeDuration, Disambiguation, TimeDuration, TimeField, TimeFields} from './types';\nimport {CalendarDate, CalendarDateTime, Time, ZonedDateTime} from './CalendarDate';\nimport {epochFromDate, fromAbsolute, toAbsolute, toCalendar, toCalendarDateTime} from './conversion';\nimport {GregorianCalendar} from './calendars/GregorianCalendar';\nimport {Mutable} from './utils';\n\nconst ONE_HOUR = 3600000;\n\nexport function add(date: CalendarDateTime, duration: DateTimeDuration): CalendarDateTime;\nexport function add(date: CalendarDate, duration: DateDuration): CalendarDate;\nexport function add(date: CalendarDate | CalendarDateTime, duration: DateTimeDuration): CalendarDate | CalendarDateTime;\nexport function add(date: CalendarDate | CalendarDateTime, duration: DateTimeDuration): Mutable<AnyCalendarDate | AnyDateTime> {\n  let mutableDate: Mutable<AnyCalendarDate | AnyDateTime> = date.copy();\n  let days = 'hour' in mutableDate ? addTimeFields(mutableDate, duration) : 0;\n\n  addYears(mutableDate, duration.years || 0);\n  if (mutableDate.calendar.balanceYearMonth) {\n    mutableDate.calendar.balanceYearMonth(mutableDate, date);\n  }\n\n  mutableDate.month += duration.months || 0;\n\n  balanceYearMonth(mutableDate);\n  constrainMonthDay(mutableDate);\n\n  mutableDate.day += (duration.weeks || 0) * 7;\n  mutableDate.day += duration.days || 0;\n  mutableDate.day += days;\n\n  balanceDay(mutableDate);\n\n  if (mutableDate.calendar.balanceDate) {\n    mutableDate.calendar.balanceDate(mutableDate);\n  }\n\n  // Constrain in case adding ended up with a date outside the valid range for the calendar system.\n  // The behavior here is slightly different than when constraining in the `set` function in that\n  // we adjust smaller fields to their minimum/maximum values rather than constraining each field\n  // individually. This matches the general behavior of `add` vs `set` regarding how fields are balanced.\n  if (mutableDate.year < 1) {\n    mutableDate.year = 1;\n    mutableDate.month = 1;\n    mutableDate.day = 1;\n  }\n\n  let maxYear = mutableDate.calendar.getYearsInEra(mutableDate);\n  if (mutableDate.year > maxYear) {\n    let isInverseEra = mutableDate.calendar.isInverseEra?.(mutableDate);\n    mutableDate.year = maxYear;\n    mutableDate.month = isInverseEra ? 1 : mutableDate.calendar.getMonthsInYear(mutableDate);\n    mutableDate.day = isInverseEra ? 1 : mutableDate.calendar.getDaysInMonth(mutableDate);\n  }\n\n  if (mutableDate.month < 1) {\n    mutableDate.month = 1;\n    mutableDate.day = 1;\n  }\n\n  let maxMonth = mutableDate.calendar.getMonthsInYear(mutableDate);\n  if (mutableDate.month > maxMonth) {\n    mutableDate.month = maxMonth;\n    mutableDate.day = mutableDate.calendar.getDaysInMonth(mutableDate);\n  }\n\n  mutableDate.day = Math.max(1, Math.min(mutableDate.calendar.getDaysInMonth(mutableDate), mutableDate.day));\n  return mutableDate;\n}\n\nfunction addYears(date: Mutable<AnyCalendarDate>, years: number) {\n  if (date.calendar.isInverseEra?.(date)) {\n    years = -years;\n  }\n\n  date.year += years;\n}\n\nfunction balanceYearMonth(date: Mutable<AnyCalendarDate>) {\n  while (date.month < 1) {\n    addYears(date, -1);\n    date.month += date.calendar.getMonthsInYear(date);\n  }\n\n  let monthsInYear = 0;\n  while (date.month > (monthsInYear = date.calendar.getMonthsInYear(date))) {\n    date.month -= monthsInYear;\n    addYears(date, 1);\n  }\n}\n\nfunction balanceDay(date: Mutable<AnyCalendarDate>) {\n  while (date.day < 1) {\n    date.month--;\n    balanceYearMonth(date);\n    date.day += date.calendar.getDaysInMonth(date);\n  }\n\n  while (date.day > date.calendar.getDaysInMonth(date)) {\n    date.day -= date.calendar.getDaysInMonth(date);\n    date.month++;\n    balanceYearMonth(date);\n  }\n}\n\nfunction constrainMonthDay(date: Mutable<AnyCalendarDate>) {\n  date.month = Math.max(1, Math.min(date.calendar.getMonthsInYear(date), date.month));\n  date.day = Math.max(1, Math.min(date.calendar.getDaysInMonth(date), date.day));\n}\n\nexport function constrain(date: Mutable<AnyCalendarDate>): void {\n  if (date.calendar.constrainDate) {\n    date.calendar.constrainDate(date);\n  }\n\n  date.year = Math.max(1, Math.min(date.calendar.getYearsInEra(date), date.year));\n  constrainMonthDay(date);\n}\n\nexport function invertDuration(duration: DateTimeDuration): DateTimeDuration {\n  let inverseDuration = {};\n  for (let key in duration) {\n    if (typeof duration[key] === 'number') {\n      inverseDuration[key] = -duration[key];\n    }\n  }\n\n  return inverseDuration;\n}\n\nexport function subtract(date: CalendarDateTime, duration: DateTimeDuration): CalendarDateTime;\nexport function subtract(date: CalendarDate, duration: DateDuration): CalendarDate;\nexport function subtract(date: CalendarDate | CalendarDateTime, duration: DateTimeDuration): CalendarDate | CalendarDateTime {\n  return add(date, invertDuration(duration));\n}\n\nexport function set(date: CalendarDateTime, fields: DateFields): CalendarDateTime;\nexport function set(date: CalendarDate, fields: DateFields): CalendarDate;\nexport function set(date: CalendarDate | CalendarDateTime, fields: DateFields): Mutable<AnyCalendarDate> {\n  let mutableDate: Mutable<AnyCalendarDate> = date.copy();\n\n  if (fields.era != null) {\n    mutableDate.era = fields.era;\n  }\n\n  if (fields.year != null) {\n    mutableDate.year = fields.year;\n  }\n\n  if (fields.month != null) {\n    mutableDate.month = fields.month;\n  }\n\n  if (fields.day != null) {\n    mutableDate.day = fields.day;\n  }\n\n  constrain(mutableDate);\n  return mutableDate;\n}\n\nexport function setTime(value: CalendarDateTime, fields: TimeFields): CalendarDateTime;\nexport function setTime(value: Time, fields: TimeFields): Time;\nexport function setTime(value: Time | CalendarDateTime, fields: TimeFields): Mutable<Time | CalendarDateTime> {\n  let mutableValue: Mutable<Time | CalendarDateTime> = value.copy();\n\n  if (fields.hour != null) {\n    mutableValue.hour = fields.hour;\n  }\n\n  if (fields.minute != null) {\n    mutableValue.minute = fields.minute;\n  }\n\n  if (fields.second != null) {\n    mutableValue.second = fields.second;\n  }\n\n  if (fields.millisecond != null) {\n    mutableValue.millisecond = fields.millisecond;\n  }\n\n  constrainTime(mutableValue);\n  return mutableValue;\n}\n\nfunction balanceTime(time: Mutable<AnyTime>): number {\n  time.second += Math.floor(time.millisecond / 1000);\n  time.millisecond = nonNegativeMod(time.millisecond, 1000);\n\n  time.minute += Math.floor(time.second / 60);\n  time.second = nonNegativeMod(time.second, 60);\n\n  time.hour += Math.floor(time.minute / 60);\n  time.minute = nonNegativeMod(time.minute, 60);\n\n  let days = Math.floor(time.hour / 24);\n  time.hour = nonNegativeMod(time.hour, 24);\n\n  return days;\n}\n\nexport function constrainTime(time: Mutable<AnyTime>): void {\n  time.millisecond = Math.max(0, Math.min(time.millisecond, 1000));\n  time.second = Math.max(0, Math.min(time.second, 59));\n  time.minute = Math.max(0, Math.min(time.minute, 59));\n  time.hour = Math.max(0, Math.min(time.hour, 23));\n}\n\nfunction nonNegativeMod(a: number, b: number) {\n  let result = a % b;\n  if (result < 0) {\n    result += b;\n  }\n  return result;\n}\n\nfunction addTimeFields(time: Mutable<AnyTime>, duration: TimeDuration): number {\n  time.hour += duration.hours || 0;\n  time.minute += duration.minutes || 0;\n  time.second += duration.seconds || 0;\n  time.millisecond += duration.milliseconds || 0;\n  return balanceTime(time);\n}\n\nexport function addTime(time: Time, duration: TimeDuration): Time {\n  let res = time.copy();\n  addTimeFields(res, duration);\n  return res;\n}\n\nexport function subtractTime(time: Time, duration: TimeDuration): Time {\n  return addTime(time, invertDuration(duration));\n}\n\nexport function cycleDate(value: CalendarDateTime, field: DateField, amount: number, options?: CycleOptions): CalendarDateTime;\nexport function cycleDate(value: CalendarDate, field: DateField, amount: number, options?: CycleOptions): CalendarDate;\nexport function cycleDate(value: CalendarDate | CalendarDateTime, field: DateField, amount: number, options?: CycleOptions): Mutable<CalendarDate | CalendarDateTime> {\n  let mutable: Mutable<CalendarDate | CalendarDateTime> = value.copy();\n\n  switch (field) {\n    case 'era': {\n      let eras = value.calendar.getEras();\n      let eraIndex = eras.indexOf(value.era);\n      if (eraIndex < 0) {\n        throw new Error('Invalid era: ' + value.era);\n      }\n      eraIndex = cycleValue(eraIndex, amount, 0, eras.length - 1, options?.round);\n      mutable.era = eras[eraIndex];\n\n      // Constrain the year and other fields within the era, so the era doesn't change when we balance below.\n      constrain(mutable);\n      break;\n    }\n    case 'year': {\n      if (mutable.calendar.isInverseEra?.(mutable)) {\n        amount = -amount;\n      }\n\n      // The year field should not cycle within the era as that can cause weird behavior affecting other fields.\n      // We need to also allow values < 1 so that decrementing goes to the previous era. If we get -Infinity back\n      // we know we wrapped around after reaching 9999 (the maximum), so set the year back to 1.\n      mutable.year = cycleValue(value.year, amount, -Infinity, 9999, options?.round);\n      if (mutable.year === -Infinity) {\n        mutable.year = 1;\n      }\n\n      if (mutable.calendar.balanceYearMonth) {\n        mutable.calendar.balanceYearMonth(mutable, value);\n      }\n      break;\n    }\n    case 'month':\n      mutable.month = cycleValue(value.month, amount, 1, value.calendar.getMonthsInYear(value), options?.round);\n      break;\n    case 'day':\n      mutable.day = cycleValue(value.day, amount, 1, value.calendar.getDaysInMonth(value), options?.round);\n      break;\n    default:\n      throw new Error('Unsupported field ' + field);\n  }\n\n  if (value.calendar.balanceDate) {\n    value.calendar.balanceDate(mutable);\n  }\n\n  constrain(mutable);\n  return mutable;\n}\n\nexport function cycleTime(value: CalendarDateTime, field: TimeField, amount: number, options?: CycleTimeOptions): CalendarDateTime;\nexport function cycleTime(value: Time, field: TimeField, amount: number, options?: CycleTimeOptions): Time;\nexport function cycleTime(value: Time | CalendarDateTime, field: TimeField, amount: number, options?: CycleTimeOptions): Mutable<Time | CalendarDateTime> {\n  let mutable: Mutable<Time | CalendarDateTime> = value.copy();\n\n  switch (field) {\n    case 'hour': {\n      let hours = value.hour;\n      let min = 0;\n      let max = 23;\n      if (options?.hourCycle === 12) {\n        let isPM = hours >= 12;\n        min = isPM ? 12 : 0;\n        max = isPM ? 23 : 11;\n      }\n      mutable.hour = cycleValue(hours, amount, min, max, options?.round);\n      break;\n    }\n    case 'minute':\n      mutable.minute = cycleValue(value.minute, amount, 0, 59, options?.round);\n      break;\n    case 'second':\n      mutable.second = cycleValue(value.second, amount, 0, 59, options?.round);\n      break;\n    case 'millisecond':\n      mutable.millisecond = cycleValue(value.millisecond, amount, 0, 999, options?.round);\n      break;\n    default:\n      throw new Error('Unsupported field ' + field);\n  }\n\n  return mutable;\n}\n\nfunction cycleValue(value: number, amount: number, min: number, max: number, round = false) {\n  if (round) {\n    value += Math.sign(amount);\n\n    if (value < min) {\n      value = max;\n    }\n\n    let div = Math.abs(amount);\n    if (amount > 0) {\n      value = Math.ceil(value / div) * div;\n    } else {\n      value = Math.floor(value / div) * div;\n    }\n\n    if (value > max) {\n      value = min;\n    }\n  } else {\n    value += amount;\n    if (value < min) {\n      value = max - (min - value - 1);\n    } else if (value > max) {\n      value = min + (value - max - 1);\n    }\n  }\n\n  return value;\n}\n\nexport function addZoned(dateTime: ZonedDateTime, duration: DateTimeDuration): ZonedDateTime {\n  let ms: number;\n  if ((duration.years != null && duration.years !== 0) || (duration.months != null && duration.months !== 0) || (duration.weeks != null && duration.weeks !== 0) || (duration.days != null && duration.days !== 0)) {\n    let res = add(toCalendarDateTime(dateTime), {\n      years: duration.years,\n      months: duration.months,\n      weeks: duration.weeks,\n      days: duration.days\n    });\n\n    // Changing the date may change the timezone offset, so we need to recompute\n    // using the 'compatible' disambiguation.\n    ms = toAbsolute(res, dateTime.timeZone);\n  } else {\n    // Otherwise, preserve the offset of the original date.\n    ms = epochFromDate(dateTime) - dateTime.offset;\n  }\n\n  // Perform time manipulation in milliseconds rather than on the original time fields to account for DST.\n  // For example, adding one hour during a DST transition may result in the hour field staying the same or\n  // skipping an hour. This results in the offset field changing value instead of the specified field.\n  ms += duration.milliseconds || 0;\n  ms += (duration.seconds || 0) * 1000;\n  ms += (duration.minutes || 0) * 60 * 1000;\n  ms += (duration.hours || 0) * 60 * 60 * 1000;\n\n  let res = fromAbsolute(ms, dateTime.timeZone);\n  return toCalendar(res, dateTime.calendar);\n}\n\nexport function subtractZoned(dateTime: ZonedDateTime, duration: DateTimeDuration): ZonedDateTime {\n  return addZoned(dateTime, invertDuration(duration));\n}\n\nexport function cycleZoned(dateTime: ZonedDateTime, field: DateField | TimeField, amount: number, options?: CycleTimeOptions): ZonedDateTime {\n  // For date fields, we want the time to remain consistent and the UTC offset to potentially change to account for DST changes.\n  // For time fields, we want the time to change by the amount given. This may result in the hour field staying the same, but the UTC\n  // offset changing in the case of a backward DST transition, or skipping an hour in the case of a forward DST transition.\n  switch (field) {\n    case 'hour': {\n      let min = 0;\n      let max = 23;\n      if (options?.hourCycle === 12) {\n        let isPM = dateTime.hour >= 12;\n        min = isPM ? 12 : 0;\n        max = isPM ? 23 : 11;\n      }\n\n      // The minimum and maximum hour may be affected by daylight saving time.\n      // For example, it might jump forward at midnight, and skip 1am.\n      // Or it might end at midnight and repeat the 11pm hour. To handle this, we get\n      // the possible absolute times for the min and max, and find the maximum range\n      // that is within the current day.\n      let plainDateTime = toCalendarDateTime(dateTime);\n      let minDate = toCalendar(setTime(plainDateTime, {hour: min}), new GregorianCalendar());\n      let minAbsolute = [toAbsolute(minDate, dateTime.timeZone, 'earlier'), toAbsolute(minDate, dateTime.timeZone, 'later')]\n        .filter(ms => fromAbsolute(ms, dateTime.timeZone).day === minDate.day)[0];\n\n      let maxDate = toCalendar(setTime(plainDateTime, {hour: max}), new GregorianCalendar());\n      let maxAbsolute = [toAbsolute(maxDate, dateTime.timeZone, 'earlier'), toAbsolute(maxDate, dateTime.timeZone, 'later')]\n        .filter(ms => fromAbsolute(ms, dateTime.timeZone).day === maxDate.day).pop()!;\n\n      // Since hours may repeat, we need to operate on the absolute time in milliseconds.\n      // This is done in hours from the Unix epoch so that cycleValue works correctly,\n      // and then converted back to milliseconds.\n      let ms = epochFromDate(dateTime) - dateTime.offset;\n      let hours = Math.floor(ms / ONE_HOUR);\n      let remainder = ms % ONE_HOUR;\n      ms = cycleValue(\n        hours,\n        amount,\n        Math.floor(minAbsolute / ONE_HOUR),\n        Math.floor(maxAbsolute / ONE_HOUR),\n        options?.round\n      ) * ONE_HOUR + remainder;\n\n      // Now compute the new timezone offset, and convert the absolute time back to local time.\n      return toCalendar(fromAbsolute(ms, dateTime.timeZone), dateTime.calendar);\n    }\n    case 'minute':\n    case 'second':\n    case 'millisecond':\n      // @ts-ignore\n      return cycleTime(dateTime, field, amount, options);\n    case 'era':\n    case 'year':\n    case 'month':\n    case 'day': {\n      let res = cycleDate(toCalendarDateTime(dateTime), field, amount, options);\n      let ms = toAbsolute(res, dateTime.timeZone);\n      return toCalendar(fromAbsolute(ms, dateTime.timeZone), dateTime.calendar);\n    }\n    default:\n      throw new Error('Unsupported field ' + field);\n  }\n}\n\nexport function setZoned(dateTime: ZonedDateTime, fields: DateFields & TimeFields, disambiguation?: Disambiguation): ZonedDateTime {\n  // Set the date/time fields, and recompute the UTC offset to account for DST changes.\n  // We also need to validate by converting back to a local time in case hours are skipped during forward DST transitions.\n  let plainDateTime = toCalendarDateTime(dateTime);\n  let res = setTime(set(plainDateTime, fields), fields);\n\n  // If the resulting plain date time values are equal, return the original time.\n  // We don't want to change the offset when setting the time to the same value.\n  if (res.compare(plainDateTime) === 0) {\n    return dateTime;\n  }\n\n  let ms = toAbsolute(res, dateTime.timeZone, disambiguation);\n  return toCalendar(fromAbsolute(ms, dateTime.timeZone), dateTime.calendar);\n}\n"],"names":[],"version":3,"file":"manipulation.module.js.map"}