From 8815105bf2462787885214a12af927d484226f21 Mon Sep 17 00:00:00 2001
From: Torsten Grote <t@grobox.de>
Date: Thu, 30 Jul 2020 16:40:23 -0300
Subject: Split out common code into multiplatform Kotlin library

---
 .../src/commonMain/kotlin/net/taler/common/Time.kt | 81 ++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 taler-kotlin-common/src/commonMain/kotlin/net/taler/common/Time.kt

(limited to 'taler-kotlin-common/src/commonMain/kotlin/net/taler/common/Time.kt')

diff --git a/taler-kotlin-common/src/commonMain/kotlin/net/taler/common/Time.kt b/taler-kotlin-common/src/commonMain/kotlin/net/taler/common/Time.kt
new file mode 100644
index 0000000..962e004
--- /dev/null
+++ b/taler-kotlin-common/src/commonMain/kotlin/net/taler/common/Time.kt
@@ -0,0 +1,81 @@
+/*
+ * 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?
+    }
+}
-- 
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