feat(settings): restore last session on startup (#1102) (#1105)

app/src/main/java/com/m57/hermescontrol/data/config/ServerStoreState.kt

@@ -12,6 +12,8 @@ data class ServerStoreState(
     val port: Int = 9119,
     val baseUrl: String? = null,
     val autoReconnect: Boolean = true,
+    val restoreLastSession: Boolean = false,
+    val lastOpenedSessionIds: Map<String, String> = emptyMap(),
     val themePreference: ThemePreference = ThemePreference.SYSTEM,
     val useDynamicColors: Boolean = false,
     val themePreset: ThemePreset = ThemePreset.DEFAULT,

app/src/main/java/com/m57/hermescontrol/data/local/AuthManager.kt

@@ -616,6 +616,47 @@ object AuthManager {
         serverStore.update { it.copy(autoReconnect = enabled) }
     }
 
+    // ── Restore last session on startup (issue #1102) ─────────────────────
+
+    private fun currentSessionScopeKey(): String {
+        val connId = getSelectedProfileId()?.takeIf { it.isNotBlank() } ?: DEFAULT_PROFILE_ID
+        val serverProfile = activeProfileId.value?.takeIf { it.isNotBlank() } ?: DEFAULT_PROFILE_ID
+        return "$connId:$serverProfile"
+    }
+
+    fun isRestoreLastSession(): Boolean = serverStore.getLatestState().restoreLastSession
+
+    fun setRestoreLastSession(enabled: Boolean) {
+        serverStore.update { it.copy(restoreLastSession = enabled) }
+    }
+
+    fun getLastOpenedSessionId(): String? = serverStore.getLatestState().lastOpenedSessionIds[currentSessionScopeKey()]
+
+    fun setLastOpenedSessionId(sessionId: String?) {
+        val key = currentSessionScopeKey()
+        serverStore.update { state ->
+            val updated =
+                if (sessionId != null) {
+                    state.lastOpenedSessionIds + (key to sessionId)
+                } else {
+                    state.lastOpenedSessionIds - key
+                }
+            state.copy(lastOpenedSessionIds = updated)
+        }
+    }
+
+    fun clearLastOpenedSessionId() {
+        setLastOpenedSessionId(null)
+    }
+
+    fun clearLastOpenedSessionIdsForConnection(connectionProfileId: String) {
+        serverStore.update { state ->
+            val prefix = "$connectionProfileId:"
+            val updated = state.lastOpenedSessionIds.filterKeys { !it.startsWith(prefix) }
+            state.copy(lastOpenedSessionIds = updated)
+        }
+    }
+
     // ── Theme preference ──────────────────────────────────────────────────
 
     fun getThemePreference(): ThemePreference = serverStore.getLatestState().themePreference

app/src/main/java/com/m57/hermescontrol/ui/chat/ChatViewModel.kt

@@ -677,6 +677,13 @@ class ChatViewModel(
             if (!initial.isNullOrBlank()) {
                 initialSessionId = null
                 switchSession(initial)
+            } else if (AuthManager.isRestoreLastSession()) {
+                val restoredId = AuthManager.getLastOpenedSessionId()
+                if (!restoredId.isNullOrBlank()) {
+                    switchSession(restoredId)
+                } else {
+                    createNewSession(setLoading = false)
+                }
             } else {
                 createNewSession(setLoading = false)
             }
@@ -1406,6 +1413,7 @@ class ChatViewModel(
         userMessage: ChatMessage? = null,
     ) {
         val dispatchGeneration = sessionGeneration
+        AuthManager.setLastOpenedSessionId(storageSessionId)
         val msgToPersist =
             userMessage ?: ChatMessage(
                 role = MessageRole.USER,
@@ -2356,6 +2364,7 @@ class ChatViewModel(
                 .find { it.id == sessionId }
                 ?.title ?: "Hermes"
         val generation = resetSessionState(sessionId, title, isLoading = true)
+        AuthManager.setLastOpenedSessionId(sessionId)
         viewModelScope.launch {
             // Warm-cache fast-path (desktop parity): paint the cached Room
             // transcript immediately so the screen never sits blank, then load
@@ -2708,6 +2717,9 @@ class ChatViewModel(
         }
         sessionGoneRecoveryInFlight = true
         cancelResumeRetry()
+        if (AuthManager.getLastOpenedSessionId() == sessionId) {
+            AuthManager.clearLastOpenedSessionId()
+        }
         _uiState.update {
             it.copy(
                 isLoading = false,

app/src/main/java/com/m57/hermescontrol/ui/sessions/SessionsViewModel.kt

@@ -2,6 +2,7 @@ package com.m57.hermescontrol.ui.sessions
 
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import com.m57.hermescontrol.data.local.AuthManager
 import com.m57.hermescontrol.data.model.BulkDeleteRequest
 import com.m57.hermescontrol.data.model.PruneRequest
 import com.m57.hermescontrol.data.model.SessionInfo
@@ -689,6 +690,9 @@ class SessionsViewModel(
                 }
             when (result) {
                 is NetworkResult.Success -> {
+                    if (AuthManager.getLastOpenedSessionId() == sessionId) {
+                        AuthManager.clearLastOpenedSessionId()
+                    }
                     _uiState.update {
                         val updatedSessions = it.sessions.filter { s -> s.id != sessionId }
                         val newTotal = (it.total - 1).coerceAtLeast(0)
@@ -739,6 +743,10 @@ class SessionsViewModel(
                 }
             when (result) {
                 is NetworkResult.Success -> {
+                    val lastOpened = AuthManager.getLastOpenedSessionId()
+                    if (lastOpened != null && ids.contains(lastOpened)) {
+                        AuthManager.clearLastOpenedSessionId()
+                    }
                     val deletedCount = result.data.deleted
                     val toastMsg =
                         if (deletedCount > 0) {

app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsScreen.kt

@@ -113,7 +113,7 @@ fun SettingsScreen(
                             icon = Icons.Filled.Tune,
                             label = stringResource(R.string.settings_sec_behavior),
                             summary =
-                                if (state.autoReconnect) {
+                                if (state.autoReconnect || state.restoreLastSession) {
                                     stringResource(R.string.settings_summary_on)
                                 } else {
                                     stringResource(R.string.settings_summary_off)

app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsSubPages.kt

@@ -227,6 +227,8 @@ internal fun SettingsBehaviorPage(
             BehaviorSection(
                 autoReconnect = state.autoReconnect,
                 onAutoReconnectChange = viewModel::onAutoReconnectChange,
+                restoreLastSession = state.restoreLastSession,
+                onRestoreLastSessionChange = viewModel::onRestoreLastSessionChange,
             )
         }
     }

app/src/main/java/com/m57/hermescontrol/ui/settings/SettingsViewModel.kt

@@ -28,6 +28,7 @@ data class SettingsUiState(
     val transportWarning: String? = null,
     val token: String = "",
     val autoReconnect: Boolean = true,
+    val restoreLastSession: Boolean = false,
     val themePreference: ThemePreference = ThemePreference.SYSTEM,
     val useDynamicColors: Boolean = false,
     val themePreset: ThemePreset = ThemePreset.DEFAULT,
@@ -72,6 +73,7 @@ class SettingsViewModel(
         val baseUrl = AuthManager.getBaseUrl()
         val token = AuthManager.getToken() ?: ""
         val autoReconnect = AuthManager.isAutoReconnect()
+        val restoreLastSession = AuthManager.isRestoreLastSession()
         val themePreference = AuthManager.getThemePreference()
         val useDynamicColors = AuthManager.isUseDynamicColors()
         val themePreset = AuthManager.getThemePreset()
@@ -92,6 +94,7 @@ class SettingsViewModel(
                 transportWarning = transportWarning,
                 token = token,
                 autoReconnect = autoReconnect,
+                restoreLastSession = restoreLastSession,
                 themePreference = themePreference,
                 useDynamicColors = useDynamicColors,
                 themePreset = themePreset,
@@ -120,6 +123,7 @@ class SettingsViewModel(
         val updatedProfiles = AuthManager.getConnectionProfiles().filter { it.id != profileId }
         AuthManager.saveConnectionProfiles(updatedProfiles)
         AuthManager.setProfileToken(profileId, null)
+        AuthManager.clearLastOpenedSessionIdsForConnection(profileId)
         // Never leave selection null (issue #478): if the deleted profile was selected,
         // fall back to the default profile instead of clearing selection.
         val reselectDefault =
@@ -283,6 +287,11 @@ class SettingsViewModel(
         AuthManager.setAutoReconnect(enabled)
     }
 
+    fun onRestoreLastSessionChange(enabled: Boolean) {
+        _uiState.update { it.copy(restoreLastSession = enabled, isSaved = false) }
+        AuthManager.setRestoreLastSession(enabled)
+    }
+
     fun onThemeChange(theme: ThemePreference) {
         _uiState.update { it.copy(themePreference = theme, isSaved = false) }
         AuthManager.setThemePreference(theme)
@@ -323,6 +332,7 @@ class SettingsViewModel(
         AuthManager.setToken(null)
         AuthManager.setSessionCookie(null)
         AuthManager.setWsAuthParam("token")
+        AuthManager.clearLastOpenedSessionId()
         HermesWsClient.disconnect(clearPendingMessages = true)
         // Don't rebuild ApiClient here — let the navigation complete first
     }
@@ -337,6 +347,7 @@ class SettingsViewModel(
         AuthManager.setBaseUrl(normalized)
         AuthManager.setToken(state.token)
         AuthManager.setAutoReconnect(state.autoReconnect)
+        AuthManager.setRestoreLastSession(state.restoreLastSession)
         // B6 (Jun 18 2026, kanban t_86e9be9b): persist theme choice so it
         // survives a cold start (was previously dropped on save()).
         AuthManager.setThemePreference(state.themePreference)

app/src/main/java/com/m57/hermescontrol/ui/settings/components/BehaviorSection.kt

@@ -3,17 +3,19 @@ package com.m57.hermescontrol.ui.settings.components
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Switch
 import androidx.compose.material3.SwitchDefaults
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
 import com.m57.hermescontrol.R
 import com.m57.hermescontrol.ui.settings.SectionCard
 
@@ -21,6 +23,8 @@ import com.m57.hermescontrol.ui.settings.SectionCard
 internal fun BehaviorSection(
     autoReconnect: Boolean,
     onAutoReconnectChange: (Boolean) -> Unit,
+    restoreLastSession: Boolean,
+    onRestoreLastSessionChange: (Boolean) -> Unit,
 ) {
     SectionCard {
         Row(
@@ -28,7 +32,7 @@ internal fun BehaviorSection(
             horizontalArrangement = Arrangement.SpaceBetween,
             verticalAlignment = Alignment.CenterVertically,
         ) {
-            Column {
+            Column(modifier = Modifier.weight(1f)) {
                 Text(
                     text = stringResource(R.string.settings_item_auto_reconnect),
                     style = MaterialTheme.typography.bodyLarge,
@@ -51,5 +55,38 @@ internal fun BehaviorSection(
                     ),
             )
         }
+
+        Spacer(modifier = Modifier.height(12.dp))
+        HorizontalDivider(color = MaterialTheme.colorScheme.outlineVariant)
+        Spacer(modifier = Modifier.height(12.dp))
+
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.SpaceBetween,
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Column(modifier = Modifier.weight(1f)) {
+                Text(
+                    text = stringResource(R.string.settings_item_restore_session),
+                    style = MaterialTheme.typography.bodyLarge,
+                )
+                Text(
+                    text = stringResource(R.string.settings_desc_restore_session),
+                    style =
+                        MaterialTheme.typography.bodySmall.copy(
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        ),
+                )
+            }
+            Switch(
+                checked = restoreLastSession,
+                onCheckedChange = onRestoreLastSessionChange,
+                colors =
+                    SwitchDefaults.colors(
+                        checkedThumbColor = MaterialTheme.colorScheme.primary,
+                        checkedTrackColor = MaterialTheme.colorScheme.primaryContainer,
+                    ),
+            )
+        }
     }
 }