Add last update time to Updates Tab (closes #5466)

Co-authored-by: datreesezcup <datreesezcup@users.noreply.github.com>

app/src/main/java/eu/kanade/presentation/updates/UpdatesScreen.kt

@@ -163,6 +163,11 @@ fun UpdateScreen(
                         state = updatesListState,
                         contentPadding = contentPaddingWithNavBar,
                     ) {
+                        if (presenter.lastUpdated > 0L) {
+                            item(key = "last_updated") {
+                                UpdatesLastUpdatedItem(presenter.lastUpdated)
+                            }
+                        }
                         updatesUiItems(
                             uiModels = presenter.uiModels,
                             selectionMode = presenter.selectionMode,

app/src/main/java/eu/kanade/presentation/updates/UpdatesUiItem.kt

@@ -1,7 +1,9 @@
 package eu.kanade.presentation.updates
 
+import android.text.format.DateUtils
 import androidx.compose.foundation.background
 import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
@@ -15,6 +17,7 @@ import androidx.compose.foundation.lazy.items
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Bookmark
 import androidx.compose.material3.Icon
+import androidx.compose.material3.LocalTextStyle
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
@@ -30,6 +33,7 @@ import androidx.compose.ui.hapticfeedback.HapticFeedbackType
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.platform.LocalHapticFeedback
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontStyle
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import eu.kanade.domain.updates.model.UpdatesWithRelations
@@ -43,6 +47,28 @@ import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.download.model.Download
 import eu.kanade.tachiyomi.ui.recent.updates.UpdatesItem
 import java.text.DateFormat
+import java.util.Date
+
+@Composable
+fun UpdatesLastUpdatedItem(
+    lastUpdated: Long,
+) {
+    val time = remember(lastUpdated) {
+        DateUtils.getRelativeTimeSpanString(lastUpdated, Date().time, DateUtils.MINUTE_IN_MILLIS)
+    }
+
+    Box(
+        modifier = Modifier
+            .padding(horizontal = horizontalPadding, vertical = 8.dp),
+    ) {
+        Text(
+            text = stringResource(R.string.updates_last_update_info, time),
+            style = LocalTextStyle.current.copy(
+                fontStyle = FontStyle.Italic,
+            ),
+        )
+    }
+}
 
 fun LazyListScope.updatesUiItems(
     uiModels: List<UpdatesUiModel>,

app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt

@@ -68,6 +68,7 @@ import logcat.LogPriority
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
 import java.io.File
+import java.util.Date
 import java.util.concurrent.CopyOnWriteArrayList
 import java.util.concurrent.atomic.AtomicBoolean
 import java.util.concurrent.atomic.AtomicInteger
@@ -225,6 +226,11 @@ class LibraryUpdateService(
         updateJob?.cancel()
         ioScope?.cancel()
 
+        // If this is a chapter update; set the last update time to now
+        if (target == Target.CHAPTERS) {
+            preferences.libraryUpdateLastTimestamp().set(Date().time)
+        }
+
         // Update favorite manga
         val categoryId = intent.getLongExtra(KEY_CATEGORY, -1L)
         addMangaToQueue(categoryId)

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt

@@ -219,6 +219,7 @@ class PreferencesHelper(val context: Context) {
     fun removeExcludeCategories() = flowPrefs.getStringSet("remove_exclude_categories", emptySet())
 
     fun libraryUpdateInterval() = flowPrefs.getInt("pref_library_update_interval_key", 24)
+    fun libraryUpdateLastTimestamp() = flowPrefs.getLong("library_update_last_timestamp", 0L)
 
     fun libraryUpdateDeviceRestriction() = flowPrefs.getStringSet("library_update_restriction", setOf(DEVICE_ONLY_ON_WIFI))
     fun libraryUpdateMangaRestriction() = flowPrefs.getStringSet("library_update_manga_restriction", setOf(MANGA_HAS_UNREAD, MANGA_NON_COMPLETED, MANGA_NON_READ))

app/src/main/java/eu/kanade/tachiyomi/ui/recent/updates/UpdatesPresenter.kt

@@ -52,11 +52,11 @@ class UpdatesPresenter(
 ) : BasePresenter<UpdatesController>(), UpdatesState by state {
 
     val isDownloadOnly: Boolean by preferences.downloadedOnly().asState()
-
     val isIncognitoMode: Boolean by preferences.incognitoMode().asState()
 
-    val relativeTime: Int by preferences.relativeTime().asState()
+    val lastUpdated by preferences.libraryUpdateLastTimestamp().asState()
 
+    val relativeTime: Int by preferences.relativeTime().asState()
     val dateFormat: DateFormat by mutableStateOf(preferences.dateFormat())
 
     private val _events: Channel<Event> = Channel(Int.MAX_VALUE)