feat: Add draonic sacrifice tracker

1 files changed, 38 insertions, 0 deletions

diff --git a/src/main/kotlin/moe/nea/ledger/DebouncedValue.kt b/src/main/kotlin/moe/nea/ledger/DebouncedValue.kt
new file mode 100644
index 0000000..66fba8d
--- /dev/null
+++ b/src/main/kotlin/moe/nea/ledger/DebouncedValue.kt
@@ -0,0 +1,38 @@
+package moe.nea.ledger
+
+import kotlin.time.Duration
+import kotlin.time.Duration.Companion.nanoseconds
+import kotlin.time.Duration.Companion.seconds
+
+class DebouncedValue<T>(private val value: T) {
+	companion object {
+		fun <T> farFuture(): DebouncedValue<T> {
+			val value = DebouncedValue(Unit)
+			value.take()
+			@Suppress("UNCHECKED_CAST")
+			return value as DebouncedValue<T>
+		}
+	}
+
+	val lastSeenAt = System.nanoTime()
+	val age get() = (System.nanoTime() - lastSeenAt).nanoseconds
+	var taken = false
+		private set
+
+	fun get(debounce: Duration): T? {
+		return if (!taken && age >= debounce) value
+		else null
+	}
+
+	fun replace(): T? {
+		return consume(0.seconds)
+	}
+
+	fun consume(debounce: Duration): T? {
+		return get(debounce)?.also { take() }
+	}
+
+	fun take() {
+		taken = true
+	}
+}
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