Dispensary.kt

fun Dispensary.currentDayStatus(): DispensaryTimeStatus? {
    val currentDayKey = when (Calendar.getInstance().dayOfWeek) {
        Calendar.MONDAY -> Dispensary.MONDAY_KEY
        Calendar.TUESDAY -> Dispensary.TUESDAY_KEY
        Calendar.WEDNESDAY -> Dispensary.WEDNESDAY_KEY
        Calendar.THURSDAY -> Dispensary.THURSDAY_KEY
        Calendar.FRIDAY -> Dispensary.FRIDAY_KEY
        Calendar.SATURDAY -> Dispensary.SATURDAY_KEY
        Calendar.SUNDAY -> Dispensary.SUNDAY_KEY

        else -> null
    }

    return timeStatuses
            .mapKeys { (key, _) -> key.toLowerCase(Locale.ROOT) }[currentDayKey]
}


fun Dispensary.isOpenNow(): Boolean {
    val timeZone = TimeZone.getTimeZone(timeZone)

    // current day in dispensary time zone
    val timeZoneDayKey = when (Calendar.getInstance(timeZone).dayOfWeek) {
        Calendar.MONDAY -> Dispensary.MONDAY_KEY
        Calendar.TUESDAY -> Dispensary.TUESDAY_KEY
        Calendar.WEDNESDAY -> Dispensary.WEDNESDAY_KEY
        Calendar.THURSDAY -> Dispensary.THURSDAY_KEY
        Calendar.FRIDAY -> Dispensary.FRIDAY_KEY
        Calendar.SATURDAY -> Dispensary.SATURDAY_KEY
        Calendar.SUNDAY -> Dispensary.SUNDAY_KEY

        else -> null
    }

    val timeZoneStatus = timeStatuses.mapKeys { (key, _) ->
        key.toLowerCase(Locale.ROOT)
    }[timeZoneDayKey]



    return when (timeZoneStatus) {
        null, is DispensaryTimeStatus.Close -> false
        is DispensaryTimeStatus.Open -> {
            val (currentHour, currentMinute) = Calendar.getInstance(timeZone).let {
                it.hourOfDay to it.minute
            }
            val currentMinutes = TimeUnit.DAYS.toMinutes(currentHour.toLong()) + currentMinute

            val (fromHour, fromMinute) = Calendar.getInstance(timeZone).apply {
                timeInMillis = timeZoneStatus.open
            }.let {
                it.hourOfDay to it.minute
            }
            val fromMinutes = TimeUnit.DAYS.toMinutes(fromHour.toLong()) + fromMinute

            val (toHour, toMinute) = Calendar.getInstance(timeZone).apply {
                timeInMillis = timeZoneStatus.close
            }.let {
                it.hourOfDay to it.minute
            }
            val toMinutes = TimeUnit.DAYS.toMinutes(toHour.toLong()) + toMinute


            return currentMinutes in fromMinutes..toMinutes
        }
    }
}


sealed class DispensaryTimeStatus {

    abstract val order: Int
    abstract val day: String

    data class Open(
            override val order: Int,
            override val day: String,
            val open: Timestamp,
            val close: Timestamp
    ) : DispensaryTimeStatus()

    data class Close(
            override val order: Int,
            override val day: String
    ) : DispensaryTimeStatus()

}