1 files changed, 70 insertions, 0 deletions
diff --git a/src/main/kotlin/moe/nea/ledger/utils/telemetry/ContextValue.kt b/src/main/kotlin/moe/nea/ledger/utils/telemetry/ContextValue.kt
new file mode 100644
index 0000000..b5891fc
--- /dev/null
+++ b/src/main/kotlin/moe/nea/ledger/utils/telemetry/ContextValue.kt
@@ -0,0 +1,70 @@
+package moe.nea.ledger.utils.telemetry
+
+import com.google.gson.JsonElement
+import com.google.gson.JsonObject
+
+interface ContextValue {
+	companion object {
+		fun <T : Collatable<T>> lazyCollatable(value: () -> Collatable<T>): Collatable<T> {
+			return LazyCollatable(value)
+		}
+
+		fun lazy(value: () -> ContextValue): ContextValue {
+			return object : ContextValue {
+				val value by kotlin.lazy(value)
+				override fun serialize(): JsonElement {
+					return this.value.serialize()
+				}
+			}
+		}
+
+		fun bool(boolean: Boolean): ContextValue {
+			return BooleanContext(boolean)
+		}
+
+		fun string(message: String): ContextValue {
+			return StringContext(message)
+		}
+
+		fun jsonObject(vararg pairs: Pair<String, JsonElement>): ContextValue {
+			val obj = JsonObject()
+			for ((l, r) in pairs) {
+				obj.add(l, r)
+			}
+			return JsonElementContext(obj)
+		}
+
+		fun compound(vararg pairs: Pair<String, String>): ContextValue {
+			val obj = JsonObject()
+			for ((l, r) in pairs) {
+				obj.addProperty(l, r)
+			}
+			// TODO: should this be its own class?
+			return JsonElementContext(obj)
+		}
+	}
+
+	// TODO: allow other serialization formats
+	fun serialize(): JsonElement
+	interface Collatable<T : Collatable<T>> : ContextValue {
+		fun combineWith(overrides: T): T
+		fun actualize(): T
+	}
+
+	private class LazyCollatable<T : Collatable<T>>(
+		provider: () -> Collatable<T>,
+	) : Collatable<T> {
+		val value by kotlin.lazy(provider)
+		override fun actualize(): T {
+			return value.actualize()
+		}
+
+		override fun combineWith(overrides: T): T {
+			return value.combineWith(overrides)
+		}
+
+		override fun serialize(): JsonElement {
+			return value.serialize()
+		}
+	}
+}