From e996fe1228be62b792d0327efa394b267bcdfb43 Mon Sep 17 00:00:00 2001
From: Tangem <git@tangem.com>
Date: Wed, 23 Aug 2023 16:17:16 +0300
Subject: [PATCH] Updated on 2026-08-14

---
 .../com/tangem/domain/common/TwinsHelper.kt   | 22 ++++----
 .../tangem/domain/common/TwinsHelperTest.kt   | 50 +++++++++++++++++++
 2 files changed, 62 insertions(+), 10 deletions(-)
 create mode 100644 domain/legacy/src/test/java/com/tangem/domain/common/TwinsHelperTest.kt

diff --git a/domain/legacy/src/main/java/com/tangem/domain/common/TwinsHelper.kt b/domain/legacy/src/main/java/com/tangem/domain/common/TwinsHelper.kt
index 73c31f5a28..c30c02b77c 100644
--- a/domain/legacy/src/main/java/com/tangem/domain/common/TwinsHelper.kt
+++ b/domain/legacy/src/main/java/com/tangem/domain/common/TwinsHelper.kt
@@ -51,17 +51,19 @@ object TwinsHelper {
      * cb64 <-> cb65
      */
     fun isTwinsCompatible(firstCardId: String, secondCardId: String): Boolean {
-        if (firstCardId.startsWith(FIRST_CARD_FIRST_SERIES) &&
-            secondCardId.startsWith(SECOND_CARD_FIRST_SERIES)
-        ) {
-            return true
+        return secondCardId.startsWith(getCompatibleTwinCardId(firstCardId))
+    }
+
+    private fun getCompatibleTwinCardId(cardId: String): String {
+        return when {
+            cardId.startsWith(FIRST_CARD_FIRST_SERIES) -> SECOND_CARD_FIRST_SERIES
+            cardId.startsWith(FIRST_CARD_SECOND_SERIES) -> SECOND_CARD_SECOND_SERIES
+            cardId.startsWith(SECOND_CARD_FIRST_SERIES) -> FIRST_CARD_FIRST_SERIES
+            cardId.startsWith(SECOND_CARD_SECOND_SERIES) -> FIRST_CARD_SECOND_SERIES
+            else -> {
+                "unknown"
+            }
         }
-        if (firstCardId.startsWith(FIRST_CARD_SECOND_SERIES) &&
-            secondCardId.startsWith(SECOND_CARD_SECOND_SERIES)
-        ) {
-            return true
-        }
-        return false
     }
 }
 
diff --git a/domain/legacy/src/test/java/com/tangem/domain/common/TwinsHelperTest.kt b/domain/legacy/src/test/java/com/tangem/domain/common/TwinsHelperTest.kt
new file mode 100644
index 0000000000..2fc624d9b8
--- /dev/null
+++ b/domain/legacy/src/test/java/com/tangem/domain/common/TwinsHelperTest.kt
@@ -0,0 +1,50 @@
+package com.tangem.domain.common
+
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class TwinsHelperTest {
+
+    private val pack1Twins = listOf(
+        "CB610000021",
+        "CB620000031",
+    )
+
+    private val pack2Twins = listOf(
+        "CB640000012",
+        "CB650000011",
+    )
+
+    @Test
+    fun `twins compatibility pack 1 success`() {
+        assertTrue(TwinsHelper.isTwinsCompatible(pack1Twins[0], pack1Twins[1]))
+        assertTrue(TwinsHelper.isTwinsCompatible(pack1Twins[1], pack1Twins[0]))
+    }
+
+    @Test
+    fun `twins compatibility pack 1 same cards`() {
+        assertFalse(TwinsHelper.isTwinsCompatible(pack1Twins[0], pack1Twins[0]))
+        assertFalse(TwinsHelper.isTwinsCompatible(pack1Twins[1], pack1Twins[1]))
+    }
+
+    @Test
+    fun `twins compatibility pack 2 success`() {
+        assertTrue(TwinsHelper.isTwinsCompatible(pack2Twins[0], pack2Twins[1]))
+        assertTrue(TwinsHelper.isTwinsCompatible(pack2Twins[1], pack2Twins[0]))
+    }
+
+    @Test
+    fun `twins compatibility pack 2 same cards`() {
+        assertFalse(TwinsHelper.isTwinsCompatible(pack2Twins[0], pack2Twins[0]))
+        assertFalse(TwinsHelper.isTwinsCompatible(pack2Twins[1], pack2Twins[1]))
+    }
+
+    @Test
+    fun `twins compatibility false for different packs`() {
+        assertFalse(TwinsHelper.isTwinsCompatible(pack2Twins[0], pack1Twins[1]))
+        assertFalse(TwinsHelper.isTwinsCompatible(pack1Twins[1], pack2Twins[0]))
+        assertFalse(TwinsHelper.isTwinsCompatible(pack1Twins[0], pack2Twins[1]))
+        assertFalse(TwinsHelper.isTwinsCompatible(pack2Twins[1], pack1Twins[0]))
+    }
+}
\ No newline at end of file