From ec3afc615cc23ad15c7bd7f1e1590346ae6ecfce Mon Sep 17 00:00:00 2001
From: InsanusMokrassar <ovsyannikov.alexey95@gmail.com>
Date: Fri, 20 Jan 2023 13:29:45 +0600
Subject: [PATCH] add serializable diff

---
 .../dev/inmo/micro_utils/common/DiffUtils.kt  |  9 ++++--
 .../common/IndexedValueSerializer.kt          | 30 +++++++++++++++++++
 2 files changed, 36 insertions(+), 3 deletions(-)
 create mode 100644 common/src/commonMain/kotlin/dev/inmo/micro_utils/common/IndexedValueSerializer.kt

diff --git a/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/DiffUtils.kt b/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/DiffUtils.kt
index 596e413fa21..367c267ac77 100644
--- a/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/DiffUtils.kt
+++ b/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/DiffUtils.kt
@@ -2,6 +2,8 @@
 
 package dev.inmo.micro_utils.common
 
+import kotlinx.serialization.Serializable
+
 private inline fun <T> getObject(
     additional: MutableList<T>,
     iterator: Iterator<T>
@@ -24,13 +26,14 @@ private inline fun <T> getObject(
  *
  * @see calculateDiff
  */
+@Serializable
 data class Diff<T> internal constructor(
-    val removed: List<IndexedValue<T>>,
+    val removed: List<@Serializable(IndexedValueSerializer::class) IndexedValue<T>>,
     /**
      * Old-New values pairs
      */
-    val replaced: List<Pair<IndexedValue<T>, IndexedValue<T>>>,
-    val added: List<IndexedValue<T>>
+    val replaced: List<Pair<@Serializable(IndexedValueSerializer::class) IndexedValue<T>, @Serializable(IndexedValueSerializer::class) IndexedValue<T>>>,
+    val added: List<@Serializable(IndexedValueSerializer::class) IndexedValue<T>>
 )
 
 private inline fun <T> performChanges(
diff --git a/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/IndexedValueSerializer.kt b/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/IndexedValueSerializer.kt
new file mode 100644
index 00000000000..780972f4756
--- /dev/null
+++ b/common/src/commonMain/kotlin/dev/inmo/micro_utils/common/IndexedValueSerializer.kt
@@ -0,0 +1,30 @@
+package dev.inmo.micro_utils.common
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.Serializer
+import kotlinx.serialization.builtins.PairSerializer
+import kotlinx.serialization.builtins.serializer
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+
+class IndexedValueSerializer<T>(private val subSerializer: KSerializer<T>) : KSerializer<IndexedValue<T>> {
+    private val originalSerializer = PairSerializer(Int.serializer(), subSerializer)
+    override val descriptor: SerialDescriptor
+        get() = originalSerializer.descriptor
+
+    override fun deserialize(decoder: Decoder): IndexedValue<T> {
+        val pair = originalSerializer.deserialize(decoder)
+        return IndexedValue(
+            pair.first,
+            pair.second
+        )
+    }
+
+    override fun serialize(encoder: Encoder, value: IndexedValue<T>) {
+        originalSerializer.serialize(
+            encoder,
+            Pair(value.index, value.value)
+        )
+    }
+}