Record time when last automatic backup was created

Closes #3474

app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsDataScreen.kt

@@ -33,6 +33,7 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import eu.kanade.presentation.more.settings.Preference
 import eu.kanade.presentation.permissions.PermissionRequestHelper
+import eu.kanade.presentation.util.relativeTimeSpanString
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.backup.BackupConst
 import eu.kanade.tachiyomi.data.backup.BackupCreateJob
@@ -82,6 +83,7 @@ object SettingsDataScreen : SearchableSettings {
         val context = LocalContext.current
         val backupIntervalPref = backupPreferences.backupInterval()
         val backupInterval by backupIntervalPref.collectAsState()
+        val lastAutoBackup by backupPreferences.lastAutoBackupTimestamp().collectAsState()
 
         return Preference.PreferenceGroup(
             title = stringResource(R.string.label_backup),
@@ -113,7 +115,10 @@ object SettingsDataScreen : SearchableSettings {
                     title = stringResource(R.string.pref_backup_slots),
                     entries = listOf(2, 3, 4, 5).associateWith { it.toString() },
                 ),
-                Preference.PreferenceItem.InfoPreference(stringResource(R.string.backup_info)),
+                Preference.PreferenceItem.InfoPreference(
+                    stringResource(R.string.backup_info) + "\n\n" +
+                        stringResource(R.string.last_auto_backup_info, relativeTimeSpanString(lastAutoBackup)),
+                ),
             ),
         )
     }

app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupCreateJob.kt

@@ -23,6 +23,7 @@ import tachiyomi.core.util.system.logcat
 import tachiyomi.domain.backup.service.BackupPreferences
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
+import java.util.Date
 import java.util.concurrent.TimeUnit
 import kotlin.time.Duration.Companion.minutes
 import kotlin.time.toJavaDuration
@@ -50,7 +51,11 @@ class BackupCreateJob(private val context: Context, workerParams: WorkerParamete
 
         return try {
             val location = BackupCreator(context).createBackup(uri, flags, isAutoBackup)
-            if (!isAutoBackup) notifier.showBackupComplete(UniFile.fromUri(context, location.toUri()))
+            if (isAutoBackup) {
+                backupPreferences.lastAutoBackupTimestamp().set(Date().time)
+            } else {
+                notifier.showBackupComplete(UniFile.fromUri(context, location.toUri()))
+            }
             Result.success()
         } catch (e: Exception) {
             logcat(LogPriority.ERROR, e)

domain/src/main/java/tachiyomi/domain/backup/service/BackupPreferences.kt

@@ -13,4 +13,7 @@ class BackupPreferences(
     fun numberOfBackups() = preferenceStore.getInt("backup_slots", 2)
 
     fun backupInterval() = preferenceStore.getInt("backup_interval", 12)
+
+    // TODO: move this and other "app state" preferences elsewhere and exclude from backups
+    fun lastAutoBackupTimestamp() = preferenceStore.getLong("__APP_STATE_last_auto_backup_timestamp", 0L)
 }

i18n/src/main/res/values/strings.xml

@@ -505,6 +505,7 @@
     <string name="restoring_backup_error">Restoring backup failed</string>
     <string name="restoring_backup_canceled">Canceled restore</string>
     <string name="backup_info">You should keep copies of backups in other places as well. Backups may contain sensitive data including any stored passwords; be careful if sharing.</string>
+    <string name="last_auto_backup_info">Last automatically backed up: %s</string>
 
     <!-- Sync section -->
     <string name="syncing_library">Syncing library</string>