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package org.apache.james.jmap.utils.quotas

import javax.inject.Inject
import org.apache.james.core.quota.{QuotaLimitValue, QuotaUsageValue}
import org.apache.james.jmap.core.UnsignedInt
import org.apache.james.jmap.core.UnsignedInt.UnsignedInt
import org.apache.james.jmap.mail.{Quota, QuotaId, QuotaRoot, Quotas, Value}
import org.apache.james.mailbox.exception.MailboxException
import org.apache.james.mailbox.model.{Quota => ModelQuota}
import org.apache.james.mailbox.quota.QuotaManager
import reactor.core.scala.publisher.SMono

class QuotaReader @Inject() (quotaManager: QuotaManager) {
  @throws[MailboxException]
  def retrieveQuotas(quotaRoot: QuotaRoot): SMono[Quotas] = {
    val quotaId = QuotaId.fromQuotaRoot(quotaRoot)
    val quotas = quotaManager.getQuotas(quotaRoot.toModel)
    SMono.just(Quotas.from(
      quotaId,
      Quota.from(Map(
        Quotas.Storage -> quotaToValue(quotas.getStorageQuota),
        Quotas.Message -> quotaToValue(quotas.getMessageQuota)))))
  }

  private def quotaToValue[T <: QuotaLimitValue[T], U <: QuotaUsageValue[U, T]](quota: ModelQuota[T, U]): Value =
    Value(
      UnsignedInt.liftOrThrow(quota.getUsed.asLong),
      asNumber(quota.getLimit))

  private def asNumber(value: QuotaLimitValue[_]): Option[UnsignedInt] =
    if (value.isUnlimited) {
      None
    } else {
      Some(UnsignedInt.liftOrThrow(value.asLong))
    }
}
