commonMain.internal.CronDateTimeSchedulerTz.kt Maven / Gradle / Ivy

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It is an analog of crontab util for Kotlin Coroutines

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package dev.inmo.krontab.internal

import korlibs.time.DateTime
import korlibs.time.DateTimeTz
import korlibs.time.TimezoneOffset
import dev.inmo.krontab.KronScheduler
import dev.inmo.krontab.KronSchedulerTz

/**
 * Cron-oriented realisation of [KronScheduler] with taking into account [offset] for list of [cronDateTimes]
 *
 * @see CronDateTime
 */
internal data class CronDateTimeSchedulerTz internal constructor(
    internal val cronDateTime: CronDateTime,
    internal val offset: TimezoneOffset
) : KronSchedulerTz {
    override suspend fun next(relatively: DateTimeTz): DateTimeTz? {
        val dateTimeWithActualOffset = relatively.toOffset(offset).local
        return cronDateTime.toNearDateTime(dateTimeWithActualOffset) ?.toOffsetUnadjusted(offset) ?.toOffset(relatively.offset)
    }

    override suspend fun next(relatively: DateTime): DateTime? {
        return next(relatively.toOffset(offset)) ?.utc
    }
}

internal fun mergeCronDateTimeSchedulers(
    schedulers: List
) = schedulers.groupBy {
    it.offset
}.map { (offset, schedulers) ->
    CronDateTimeSchedulerTz(
        schedulers.map { it.cronDateTime }.merge(),
        offset
    )
}