[DO NOT USE] Import backupFav

app/src/main/java/com/hippo/ehviewer/ui/settings/AdvancedScreen.kt

@@ -35,13 +35,17 @@ import com.hippo.ehviewer.BuildConfig
 import com.hippo.ehviewer.EhDB
 import com.hippo.ehviewer.R
 import com.hippo.ehviewer.Settings
+import com.hippo.ehviewer.client.EhEngine
+import com.hippo.ehviewer.client.data.FavListUrlBuilder
 import com.hippo.ehviewer.ui.legacy.BaseDialogBuilder
 import com.hippo.ehviewer.ui.login.LocalNavController
 import com.hippo.ehviewer.util.LogCat
 import com.hippo.ehviewer.util.ReadableTime
 import eu.kanade.tachiyomi.util.lang.withUIContext
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
+import moe.tarsin.coroutines.runSuspendCatching
 import java.io.File
 import java.util.zip.ZipEntry
 import java.util.zip.ZipOutputStream
@@ -198,10 +202,44 @@ fun AdvancedScreen() {
                 title = stringResource(id = R.string.settings_advanced_import_data),
                 summary = stringResource(id = R.string.settings_advanced_import_data_summary),
             ) { importLauncher.launch("application/octet-stream") }
+            val backupNothing = stringResource(id = R.string.settings_advanced_backup_favorite_nothing)
+            val backupFailed = stringResource(id = R.string.settings_advanced_backup_favorite_failed)
+            val backupSucceed = stringResource(id = R.string.settings_advanced_backup_favorite_success)
             Preference(
                 title = stringResource(id = R.string.settings_advanced_backup_favorite),
                 summary = stringResource(id = R.string.settings_advanced_backup_favorite_summary),
-            )
+            ) {
+                val favListUrlBuilder = FavListUrlBuilder()
+                var favTotal = 0
+                var favIndex = 0
+                tailrec suspend fun doBackup() {
+                    val result = EhEngine.getFavorites(favListUrlBuilder.build())
+                    if (result.galleryInfoList.isEmpty()) {
+                        snackbarHostState.showSnackbar(backupNothing)
+                    } else {
+                        if (favTotal == 0) favTotal = result.countArray.sum()
+                        favIndex += result.galleryInfoList.size
+                        val status = "($favIndex/$favTotal)"
+                        EhDB.putLocalFavorites(result.galleryInfoList)
+                        snackbarHostState.showSnackbar(context.getString(R.string.settings_advanced_backup_favorite_start, status))
+                        if (result.next != null) {
+                            delay(Settings.downloadDelay.toLong())
+                            favListUrlBuilder.setIndex(result.next, true)
+                            doBackup()
+                        }
+                    }
+                }
+                coroutineScope.launch {
+                    runSuspendCatching {
+                        doBackup()
+                    }.onSuccess {
+                        snackbarHostState.showSnackbar(backupSucceed)
+                    }.onFailure {
+                        it.printStackTrace()
+                        snackbarHostState.showSnackbar(backupFailed)
+                    }
+                }
+            }
             Preference(
                 title = stringResource(id = R.string.open_by_default),
                 summary = null,