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Wheel Date & Time Picker in Compose Multiplatform

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package dev.darkokoa.datetimewheelpicker.core

import kotlinx.datetime.Clock
import kotlinx.datetime.LocalDate
import kotlinx.datetime.LocalDateTime
import kotlinx.datetime.LocalTime
import kotlinx.datetime.TimeZone
import kotlinx.datetime.toLocalDateTime
import kotlin.time.DurationUnit
import kotlin.time.DurationUnit.*

internal fun LocalDateTime.Companion.now(timeZone: TimeZone = TimeZone.currentSystemDefault()): LocalDateTime {
  return Clock.System.now().toLocalDateTime(timeZone)
}

internal val LocalDateTime.Companion.EPOCH: LocalDateTime
  get() = LocalDateTime(LocalDate.EPOCH, LocalTime.MIN)

internal val LocalDateTime.Companion.CYB3R_1N1T_ZOLL: LocalDateTime
  get() = LocalDateTime(LocalDate.CYB3R_1N1T_ZOLL, LocalTime.MAX)

internal fun LocalDateTime.with(date: LocalDate, time: LocalTime): LocalDateTime {
  return if (this.date == date && this.time == time) {
    this
  } else {
    LocalDateTime(date, time)
  }
}

internal fun LocalDateTime.withYear(year: Int): LocalDateTime {
  return with(date.withYear(year), time)
}

internal fun LocalDateTime.withMonthNumber(monthNumber: Int): LocalDateTime {
  return with(date.withMonthNumber(monthNumber), time)
}

internal fun LocalDateTime.withDayOfMonth(dayOfMonth: Int): LocalDateTime {
  return with(date.withDayOfMonth(dayOfMonth), time)
}

internal fun LocalDateTime.withHour(hour: Int): LocalDateTime {
  return with(date, time.withHour(hour))
}

internal fun LocalDateTime.withMinute(minute: Int): LocalDateTime {
  return with(date, time.withMinute(minute))
}

internal fun LocalDateTime.isBefore(other: LocalDateTime): Boolean {
  return compareTo(other) < 0
}

internal fun LocalDateTime.isAfter(other: LocalDateTime): Boolean {
  return compareTo(other) > 0
}

internal fun LocalDateTime.truncatedTo(unit: DurationUnit): LocalDateTime {
  return when (unit) {
    NANOSECONDS -> this

    MICROSECONDS -> LocalDateTime(
      year,
      month,
      dayOfMonth,
      hour,
      minute,
      second,
      nanosecond / 1000
    )

    MILLISECONDS -> LocalDateTime(
      year,
      month,
      dayOfMonth,
      hour,
      minute,
      second,
      nanosecond / 1000000
    )

    SECONDS -> LocalDateTime(year, month, dayOfMonth, hour, minute, second)
    MINUTES -> LocalDateTime(year, month, dayOfMonth, hour, minute)
    HOURS -> LocalDateTime(year, month, dayOfMonth, hour, 0)
    DAYS -> LocalDateTime(year, month, dayOfMonth, 0, 0)
    else -> throw IllegalArgumentException("The value `else` does not match any of the patterns.")
  }
}