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+/*
+ * This file is part of GNU Taler
+ * (C) 2020 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.common
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import net.taler.common.Duration.Companion.FOREVER
+import kotlin.math.max
+
+expect fun nowMillis(): Long
+
+@Serializable
+data class Timestamp(
+ @SerialName("t_ms")
+ val ms: Long
+) : Comparable<Timestamp> {
+
+ companion object {
+ const val NEVER: Long = -1 // TODO or UINT64_MAX?
+ fun now(): Timestamp = Timestamp(nowMillis())
+ }
+
+ /**
+ * Returns a copy of this [Timestamp] rounded to seconds.
+ */
+ fun truncateSeconds(): Timestamp {
+ if (ms == NEVER) return Timestamp(ms)
+ return Timestamp((ms / 1000L) * 1000L)
+ }
+
+ operator fun minus(other: Timestamp): Duration = when {
+ ms == NEVER -> Duration(FOREVER)
+ other.ms == NEVER -> throw Error("Invalid argument for timestamp comparision")
+ ms < other.ms -> Duration(0)
+ else -> Duration(ms - other.ms)
+ }
+
+ operator fun minus(other: Duration): Timestamp = when {
+ ms == NEVER -> this
+ other.ms == FOREVER -> Timestamp(0)
+ else -> Timestamp(max(0, ms - other.ms))
+ }
+
+ override fun compareTo(other: Timestamp): Int {
+ return if (ms == NEVER) {
+ if (other.ms == NEVER) 0
+ else 1
+ } else {
+ if (other.ms == NEVER) -1
+ else ms.compareTo(other.ms)
+ }
+ }
+
+}
+
+@Serializable
+data class Duration(
+ /**
+ * Duration in milliseconds.
+ */
+ @SerialName("d_ms")
+ val ms: Long
+) {
+ companion object {
+ const val FOREVER: Long = -1 // TODO or UINT64_MAX?
+ }
+}