dough-core and all of that

dough-core/src/commonMain/kotlin/gay/pizza/dough/core/PlatformSpecific.kt

@@ -0,0 +1,5 @@
+package gay.pizza.dough.core
+
+import gay.pizza.dough.core.time.ClockProvider
+
+expect val PlatformClock: ClockProvider

dough-core/src/commonMain/kotlin/gay/pizza/dough/core/time/ClockProvider.kt

@@ -0,0 +1,5 @@
+package gay.pizza.dough.core.time
+
+interface ClockProvider {
+  fun now(): UnixTime
+}

dough-core/src/commonMain/kotlin/gay/pizza/dough/core/time/StaticClockProvider.kt

@@ -0,0 +1,11 @@
+package gay.pizza.dough.core.time
+
+import gay.pizza.dough.core.PlatformClock
+
+class StaticClockProvider(private val value: UnixTime) : ClockProvider {
+  override fun now(): UnixTime = value
+
+  companion object {
+    fun snapshot(): StaticClockProvider = StaticClockProvider(PlatformClock.now())
+  }
+}

dough-core/src/commonMain/kotlin/gay/pizza/dough/core/time/UnixTime.kt

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+package gay.pizza.dough.core.time
+
+import kotlin.jvm.JvmInline
+import kotlin.time.Duration
+import kotlin.time.DurationUnit
+import kotlin.time.toDuration
+
+@JvmInline
+value class UnixTime(val millisecondsSinceEpoch: Long) : Comparable<UnixTime> {
+  operator fun plus(time: UnixTime): UnixTime =
+    UnixTime(millisecondsSinceEpoch + time.millisecondsSinceEpoch)
+
+  operator fun minus(time: UnixTime): UnixTime =
+    UnixTime(millisecondsSinceEpoch - time.millisecondsSinceEpoch)
+
+  operator fun times(time: UnixTime): UnixTime =
+    UnixTime(millisecondsSinceEpoch * time.millisecondsSinceEpoch)
+
+  operator fun div(duration: Duration): UnixTime =
+    UnixTime(millisecondsSinceEpoch / duration.inWholeMilliseconds)
+
+  operator fun rem(time: UnixTime): UnixTime =
+    UnixTime(millisecondsSinceEpoch % time.millisecondsSinceEpoch)
+
+    operator fun plus(duration: Duration): UnixTime =
+    UnixTime(millisecondsSinceEpoch + duration.inWholeMilliseconds)
+
+  operator fun minus(duration: Duration): UnixTime =
+    UnixTime(millisecondsSinceEpoch - duration.inWholeMilliseconds)
+
+  operator fun times(duration: Duration): UnixTime =
+    UnixTime(millisecondsSinceEpoch * duration.inWholeMilliseconds)
+
+  operator fun div(time: UnixTime): UnixTime =
+    UnixTime(millisecondsSinceEpoch / time.millisecondsSinceEpoch)
+
+  operator fun rem(duration: Duration): UnixTime =
+    UnixTime(millisecondsSinceEpoch % duration.inWholeMilliseconds)
+
+  fun toDuration(): Duration = millisecondsSinceEpoch.toDuration(DurationUnit.MILLISECONDS)
+
+  override fun compareTo(other: UnixTime): Int =
+    millisecondsSinceEpoch.compareTo(other.millisecondsSinceEpoch)
+}