From 8b1d1b85eba7ebd1176f04cbdd3436337576d623 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EC=B5=9C=EC=A2=85=EC=88=98?= <chlwhdtn03@naver.com>
Date: Sat, 23 May 2026 23:06:13 +0900
Subject: [PATCH] =?UTF-8?q?[feat]=20change=5Flanguage=20=EC=9D=B4=EB=B2=A4?=
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---
 .../mypage/language/LanguageSelectorScreen.kt  | 15 ++++++++++++++-
 .../analytics/PostHogAnalyticsTrackerTest.kt   | 18 ++++++++++++++++++
 .../eatssu/common/analytics/AnalyticsEvent.kt  | 11 ++++++++++-
 3 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/app/src/main/java/com/eatssu/android/presentation/mypage/language/LanguageSelectorScreen.kt b/app/src/main/java/com/eatssu/android/presentation/mypage/language/LanguageSelectorScreen.kt
index 432d9e40..ed4264c8 100644
--- a/app/src/main/java/com/eatssu/android/presentation/mypage/language/LanguageSelectorScreen.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/mypage/language/LanguageSelectorScreen.kt
@@ -13,6 +13,8 @@ import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.eatssu.android.R
+import com.eatssu.android.analytics.LocalAnalyticsTracker
+import com.eatssu.common.analytics.ChangeLanguageEvent
 import com.eatssu.common.enums.AppLanguage
 import com.eatssu.design_system.component.EatSsuRadioCheckBoxGroup
 import com.eatssu.design_system.component.EatSsuTopBar
@@ -25,11 +27,22 @@ fun LanguageSelectorScreen(
     onBack: () -> Unit = {}
 ) {
     val selectedLanguage by viewModel.selectedLanguage.collectAsStateWithLifecycle()
+    val analyticsTracker = LocalAnalyticsTracker.current
 
     LanguageSelectorContent(
         modifier = modifier,
         selectedLanguage = selectedLanguage,
-        onLanguageSelected = { viewModel.selectLanguage(it) },
+        onLanguageSelected = { language ->
+            if (selectedLanguage != language) {
+                analyticsTracker.track(
+                    ChangeLanguageEvent(
+                        lang_from = selectedLanguage.code,
+                        lang_to = language.code,
+                    ),
+                )
+            }
+            viewModel.selectLanguage(language)
+        },
         onBack = onBack
     )
 }
diff --git a/app/src/test/java/com/eatssu/android/analytics/PostHogAnalyticsTrackerTest.kt b/app/src/test/java/com/eatssu/android/analytics/PostHogAnalyticsTrackerTest.kt
index 3f392d03..59a99e1d 100644
--- a/app/src/test/java/com/eatssu/android/analytics/PostHogAnalyticsTrackerTest.kt
+++ b/app/src/test/java/com/eatssu/android/analytics/PostHogAnalyticsTrackerTest.kt
@@ -2,6 +2,7 @@ package com.eatssu.android.analytics
 
 import com.eatssu.common.analytics.AnalyticsIdentity
 import com.eatssu.common.analytics.AppAnalyticsEvent
+import com.eatssu.common.analytics.ChangeLanguageEvent
 import com.eatssu.common.analytics.PopupEvent
 import com.eatssu.common.analytics.WidgetAnalyticsEvent
 import com.eatssu.common.enums.LaunchPath
@@ -26,6 +27,23 @@ class PostHogAnalyticsTrackerTest {
         )
     }
 
+    @Test
+    fun `change language payload keeps previous and next locale codes`() {
+        val payload = ChangeLanguageEvent(
+            lang_from = "ko",
+            lang_to = "en",
+        ).toPayload()
+
+        assertEquals("change_language", payload.eventName)
+        assertEquals(
+            mapOf(
+                "lang_from" to "ko",
+                "lang_to" to "en",
+            ),
+            payload.properties,
+        )
+    }
+
     @Test
     fun `popup event payload keeps popup name and action`() {
         val payload = PopupEvent(
diff --git a/core/common/src/main/java/com/eatssu/common/analytics/AnalyticsEvent.kt b/core/common/src/main/java/com/eatssu/common/analytics/AnalyticsEvent.kt
index 396d2b76..1e2c50f4 100644
--- a/core/common/src/main/java/com/eatssu/common/analytics/AnalyticsEvent.kt
+++ b/core/common/src/main/java/com/eatssu/common/analytics/AnalyticsEvent.kt
@@ -251,7 +251,16 @@ data class PopupEvent(
     }
 }
 
-
+data class ChangeLanguageEvent(
+    val lang_from: String,
+    val lang_to: String,
+) : AppAnalyticsEvent {
+    override val eventName = "change_language"
+    override val properties = buildMap {
+        put("lang_from", lang_from)
+        put("lang_to", lang_to)
+    }
+}
 
 private fun String.toWeekdayCode() = when (this) {
     "SUNDAY" -> "sun"