NR-122 타이머와 힌트 화면이 viewModel을 공유해서 사용하도록 리팩토링한다.

presentation/src/main/java/com/nextroom/nextroom/presentation/ui/hint/HintFragment.kt

@@ -5,6 +5,7 @@ import android.view.View
 import androidx.core.os.bundleOf
 import androidx.core.view.isVisible
 import androidx.fragment.app.viewModels
+import androidx.hilt.navigation.fragment.hiltNavGraphViewModels
 import androidx.navigation.fragment.findNavController
 import androidx.viewpager2.widget.ViewPager2
 import com.google.firebase.analytics.FirebaseAnalytics
@@ -29,6 +30,9 @@ import timber.log.Timber
 class HintFragment : BaseFragment<FragmentHintBinding>(FragmentHintBinding::inflate) {
 
     private val viewModel: HintViewModel by viewModels()
+    private val gameSharedViewModel: com.nextroom.nextroom.presentation.ui.main.GameSharedViewModel by hiltNavGraphViewModels(
+        R.id.game_navigation
+    )
     private val state: HintState
         get() = viewModel.container.stateFlow.value
 
@@ -43,6 +47,21 @@ class HintFragment : BaseFragment<FragmentHintBinding>(FragmentHintBinding::infl
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         FirebaseAnalytics.getInstance(requireContext()).logEvent("screen_view", bundleOf("screen_name" to "hint"))
+
+        // Shared ViewModel에서 hint 수집
+        viewLifecycleOwner.repeatOnStarted {
+            gameSharedViewModel.currentHint.collect { hint ->
+                hint?.let { viewModel.setHint(it) }
+            }
+        }
+
+        // Shared ViewModel에서 subscribeStatus 수집
+        viewLifecycleOwner.repeatOnStarted {
+            gameSharedViewModel.subscribeStatus.collect { subscribeStatus ->
+                viewModel.setSubscribeStatus(subscribeStatus)
+            }
+        }
+
         initViews()
         viewModel.observe(viewLifecycleOwner, state = ::render, sideEffect = ::handleEvent)
     }

presentation/src/main/java/com/nextroom/nextroom/presentation/ui/hint/HintViewModel.kt

@@ -1,6 +1,5 @@
 package com.nextroom.nextroom.presentation.ui.hint
 
-import androidx.lifecycle.SavedStateHandle
 import com.mangbaam.commonutil.DateTimeUtil
 import com.nextroom.nextroom.domain.repository.AdminRepository
 import com.nextroom.nextroom.domain.repository.DataStoreRepository
@@ -18,20 +17,14 @@ import javax.inject.Inject
 
 @HiltViewModel
 class HintViewModel @Inject constructor(
-    savedStateHandle: SavedStateHandle,
     private val timerRepository: TimerRepository,
     private val statsRepository: StatisticsRepository,
     private val adminRepository: AdminRepository,
     private val dataStoreRepository: DataStoreRepository,
 ) : BaseViewModel<HintState, HintEvent>() {
 
     override val container: Container<HintState, HintEvent> =
-        container(
-            HintState(
-                hint = savedStateHandle.get<Hint>("hint") ?: Hint(),
-                userSubscribeStatus = HintFragmentArgs.fromSavedStateHandle(savedStateHandle).subscribeStatus,
-            )
-        )
+        container(HintState())
 
     private val state: HintState
         get() = container.stateFlow.value
@@ -60,6 +53,20 @@ class HintViewModel @Inject constructor(
         reduce { state.copy(networkDisconnectedCount = count) }
     }
 
+    /**
+     * Called by HintFragment when hint is received from GameSharedViewModel
+     */
+    fun setHint(hint: Hint) = intent {
+        reduce { state.copy(hint = hint) }
+    }
+
+    /**
+     * Called by HintFragment when subscribeStatus is received from GameSharedViewModel
+     */
+    fun setSubscribeStatus(subscribeStatus: com.nextroom.nextroom.domain.model.SubscribeStatus) = intent {
+        reduce { state.copy(userSubscribeStatus = subscribeStatus) }
+    }
+
     fun openAnswer() = intent {
         reduce { state.copy(hint = state.hint.copy(answerOpened = true)) }
         // 정답 오픈 시간 통계 집계

presentation/src/main/java/com/nextroom/nextroom/presentation/ui/main/GameViewModel.kt

@@ -0,0 +1,48 @@
+package com.nextroom.nextroom.presentation.ui.main
+
+import androidx.lifecycle.SavedStateHandle
+import androidx.lifecycle.ViewModel
+import com.nextroom.nextroom.domain.model.SubscribeStatus
+import com.nextroom.nextroom.presentation.model.Hint
+import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import javax.inject.Inject
+
+@HiltViewModel
+class GameSharedViewModel @Inject constructor(
+    savedStateHandle: SavedStateHandle
+) : ViewModel() {
+
+    // subscribeStatus는 상위 navigation에서 전달받음
+    private val _subscribeStatus = MutableStateFlow(
+        TimerFragmentArgs.fromSavedStateHandle(savedStateHandle).subscribeStatus
+    )
+    val subscribeStatus: StateFlow<SubscribeStatus> = _subscribeStatus.asStateFlow()
+
+    // hint는 TimerFragment에서 설정
+    private val _currentHint = MutableStateFlow<Hint?>(null)
+    val currentHint: StateFlow<Hint?> = _currentHint.asStateFlow()
+
+    /**
+     * Called by TimerFragment when user opens a hint
+     */
+    fun setCurrentHint(hint: Hint) {
+        _currentHint.value = hint
+    }
+
+    /**
+     * Called when HintFragment updates hint state (e.g., answer opened)
+     */
+    fun updateCurrentHint(hint: Hint) {
+        _currentHint.value = hint
+    }
+
+    /**
+     * Clear hint when returning to timer screen
+     */
+    fun clearCurrentHint() {
+        _currentHint.value = null
+    }
+}

presentation/src/main/java/com/nextroom/nextroom/presentation/ui/main/TimerEvent.kt

@@ -1,12 +1,10 @@
 package com.nextroom.nextroom.presentation.ui.main
 
-import com.nextroom.nextroom.domain.model.SubscribeStatus
 import com.nextroom.nextroom.presentation.model.Hint
 
 sealed interface TimerEvent {
     data class OnOpenHint(
-        val hint: Hint,
-        val subscribeStatus: SubscribeStatus
+        val hint: Hint
     ) : TimerEvent
 
     data object TimerFinish : TimerEvent

presentation/src/main/java/com/nextroom/nextroom/presentation/ui/main/TimerFragment.kt

@@ -12,6 +12,7 @@ import androidx.core.view.isVisible
 import androidx.fragment.app.activityViewModels
 import androidx.fragment.app.setFragmentResultListener
 import androidx.fragment.app.viewModels
+import androidx.hilt.navigation.fragment.hiltNavGraphViewModels
 import androidx.navigation.fragment.findNavController
 import com.bumptech.glide.Glide
 import com.bumptech.glide.load.DataSource
@@ -50,6 +51,7 @@ class TimerFragment : BaseFragment<FragmentTimerBinding>(FragmentTimerBinding::i
 
     private val viewModel: TimerViewModel by viewModels()
     private val painterViewModel: PainterViewModel by activityViewModels()
+    private val gameSharedViewModel: GameSharedViewModel by hiltNavGraphViewModels(R.id.game_navigation)
 
     private var gameStartConfirmDialog: NRDialog? = null
 
@@ -266,7 +268,8 @@ class TimerFragment : BaseFragment<FragmentTimerBinding>(FragmentTimerBinding::i
         when (event) {
             is TimerEvent.ClearHintCode -> binding.customCodeInput.setCode("")
             is TimerEvent.OnOpenHint -> {
-                val action = TimerFragmentDirections.moveToHintFragment(event.hint, event.subscribeStatus)
+                gameSharedViewModel.setCurrentHint(event.hint)
+                val action = TimerFragmentDirections.moveToHintFragment()
                 findNavController().safeNavigate(action)
                 viewModel.clearHintCode()
             }

presentation/src/main/java/com/nextroom/nextroom/presentation/ui/main/TimerViewModel.kt

@@ -208,8 +208,7 @@ class TimerViewModel @Inject constructor(
                         answerOpened = state.answerOpenedHints.contains(hint.id),
                         hintImageUrlList = hint.hintImageUrlList.toList(),
                         answerImageUrlList = hint.answerImageUrlList.toList()
-                    ),
-                    TimerFragmentArgs.fromSavedStateHandle(savedStateHandle).subscribeStatus
+                    )
                 ),
             )
             setGameState()

presentation/src/main/res/navigation/game_navigation.xml

@@ -12,14 +12,7 @@
 
         <action
             android:id="@+id/move_to_hint_fragment"
-            app:destination="@id/hint_fragment">
-            <argument
-                android:name="hint"
-                app:argType="com.nextroom.nextroom.presentation.model.Hint" />
-            <argument
-                android:name="subscribeStatus"
-                app:argType="com.nextroom.nextroom.domain.model.SubscribeStatus" />
-        </action>
+            app:destination="@id/hint_fragment" />
         <action
             android:id="@+id/move_to_memo_fragment"
             app:destination="@id/memo_fragment" />
@@ -43,12 +36,6 @@
         <action
             android:id="@+id/move_to_memo_fragment"
             app:destination="@id/memo_fragment" />
-        <argument
-            android:name="subscribeStatus"
-            app:argType="com.nextroom.nextroom.domain.model.SubscribeStatus" />
-        <argument
-            android:name="hint"
-            app:argType="com.nextroom.nextroom.presentation.model.Hint" />
     </fragment>
 
     <fragment