Restore deleted

app/src/main/java/net/helcel/cowspent/android/settings/PreferencesActivity.kt

@@ -16,8 +16,13 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.core.app.NavUtils
 import androidx.preference.PreferenceManager
+import net.helcel.cowspent.R
 import net.helcel.cowspent.android.about.AboutActivity
 import net.helcel.cowspent.android.account.AccountActivity
+import net.helcel.cowspent.android.helper.showToast
+import net.helcel.cowspent.model.DBAccountProject
+import net.helcel.cowspent.persistence.CowspentSQLiteOpenHelper
+import net.helcel.cowspent.persistence.CowspentServerSyncHelper
 import net.helcel.cowspent.theme.ThemeUtils
 import net.helcel.cowspent.util.ColorUtils
 
@@ -34,6 +39,17 @@ class PreferencesActivity : AppCompatActivity() {
         }
     }
 
+    private fun restoreDeletedProjects(projects: List<DBAccountProject>) {
+        if (projects.isEmpty()) return
+        val syncHelper = CowspentSQLiteOpenHelper.getInstance(applicationContext).cowspentServerSyncHelper
+        syncHelper.restoreAccountProjects(projects)
+        if (CowspentServerSyncHelper.isNextcloudAccountConfigured(applicationContext)) {
+            syncHelper.runAccountProjectsSync()
+        }
+        setResult(RESULT_OK)
+        showToast(this, getString(R.string.settings_restore_deleted_projects_done))
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         enableEdgeToEdge()
         super.onCreate(savedInstanceState)
@@ -74,7 +90,8 @@ class PreferencesActivity : AppCompatActivity() {
                         startActivity(Intent(this, AboutActivity::class.java))
                     },
                     onColorSelected = { appColor = it },
-                    onNightModeChanged = { nightMode = it }
+                    onNightModeChanged = { nightMode = it },
+                    onRestoreDeletedProjects = { restoreDeletedProjects(it) }
                 )
             }
         }

app/src/main/java/net/helcel/cowspent/android/settings/SettingsScreen.kt

@@ -21,6 +21,7 @@ import androidx.compose.material.MaterialTheme
 import androidx.compose.material.RadioButton
 import androidx.compose.material.Scaffold
 import androidx.compose.material.Slider
+import androidx.compose.material.Checkbox
 import androidx.compose.material.Switch
 import androidx.compose.material.SwitchDefaults
 import androidx.compose.material.Text
@@ -34,11 +35,14 @@ import androidx.compose.material.icons.filled.Brightness2
 import androidx.compose.material.icons.filled.Group
 import androidx.compose.material.icons.filled.Info
 import androidx.compose.material.icons.filled.Palette
+import androidx.compose.material.icons.filled.Restore
 import androidx.compose.material.icons.filled.Sync
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
@@ -47,6 +51,7 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.painter.Painter
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.tooling.preview.Preview
@@ -56,6 +61,9 @@ import androidx.core.content.edit
 import androidx.preference.PreferenceManager
 import net.helcel.cowspent.R
 import net.helcel.cowspent.android.helper.ColorPicker
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import net.helcel.cowspent.model.DBAccountProject
 import net.helcel.cowspent.persistence.CowspentSQLiteOpenHelper
 import net.helcel.cowspent.persistence.CowspentServerSyncHelper
 import net.helcel.cowspent.util.ColorUtils
@@ -68,7 +76,8 @@ fun SettingsScreen(
     onAccountSettingsClick: () -> Unit,
     onAboutClick: () -> Unit,
     onColorSelected: (Int) -> Unit,
-    onNightModeChanged: (String) -> Unit = {}
+    onNightModeChanged: (String) -> Unit = {},
+    onRestoreDeletedProjects: (List<DBAccountProject>) -> Unit = {}
 ) {
     val context = LocalContext.current
     val sharedPreferences = remember { PreferenceManager.getDefaultSharedPreferences(context) }
@@ -92,6 +101,16 @@ fun SettingsScreen(
 
     val isNextcloudConfigured = CowspentServerSyncHelper.isNextcloudAccountConfigured(context)
 
+    var deletedProjects by remember { mutableStateOf(emptyList<DBAccountProject>()) }
+    var showRestoreDialog by remember { mutableStateOf(false) }
+
+    // Off the main thread: this reads the account projects table.
+    LaunchedEffect(Unit) {
+        deletedProjects = withContext(Dispatchers.IO) {
+            CowspentSQLiteOpenHelper.getInstance(context).cowspentServerSyncHelper.deletedAccountProjects()
+        }
+    }
+
     // States for preferences
     var nightMode by remember(keyNightMode) {
         mutableStateOf(sharedPreferences.getString(keyNightMode, "-1") ?: "-1")
@@ -257,6 +276,32 @@ fun SettingsScreen(
                 onClick = onAccountSettingsClick
             )
 
+            // Nothing held back means nothing to undo, so the row is not offered at all.
+            if (deletedProjects.isNotEmpty()) {
+                SettingsPreference(
+                    title = stringResource(R.string.settings_restore_deleted_projects),
+                    summary = pluralStringResource(
+                        R.plurals.settings_restore_deleted_projects_summary,
+                        deletedProjects.size,
+                        deletedProjects.size
+                    ),
+                    icon = Icons.Default.Restore,
+                    onClick = { showRestoreDialog = true }
+                )
+            }
+
+            if (showRestoreDialog) {
+                RestoreDeletedProjectsDialog(
+                    projects = deletedProjects,
+                    onDismiss = { showRestoreDialog = false },
+                    onConfirm = { chosen ->
+                        showRestoreDialog = false
+                        onRestoreDeletedProjects(chosen)
+                        deletedProjects = deletedProjects - chosen.toSet()
+                    }
+                )
+            }
+
             // Other
             SettingsCategory(stringResource(R.string.settings_other))
 
@@ -349,6 +394,60 @@ fun SettingsScreen(
     }
 }
 
+@Composable
+fun RestoreDeletedProjectsDialog(
+    projects: List<DBAccountProject>,
+    onDismiss: () -> Unit,
+    onConfirm: (List<DBAccountProject>) -> Unit
+) {
+    val selected = remember(projects) { mutableStateListOf<DBAccountProject>().apply { addAll(projects) } }
+
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text(stringResource(R.string.settings_restore_deleted_projects)) },
+        text = {
+            Column(modifier = Modifier.verticalScroll(rememberScrollState())) {
+                projects.forEach { project ->
+                    val isSelected = project in selected
+                    Row(
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .selectable(
+                                selected = isSelected,
+                                onClick = {
+                                    if (isSelected) selected.remove(project) else selected.add(project)
+                                }
+                            )
+                            .padding(vertical = 8.dp),
+                        verticalAlignment = Alignment.CenterVertically
+                    ) {
+                        Checkbox(checked = isSelected, onCheckedChange = null)
+                        Spacer(Modifier.width(16.dp))
+                        Column {
+                            Text(
+                                text = project.name.ifEmpty { project.remoteId },
+                                style = MaterialTheme.typography.subtitle1
+                            )
+                            Text(text = project.ncUrl, style = MaterialTheme.typography.caption)
+                        }
+                    }
+                }
+            }
+        },
+        confirmButton = {
+            TextButton(
+                onClick = { onConfirm(selected.toList()) },
+                enabled = selected.isNotEmpty()
+            ) {
+                Text(stringResource(R.string.settings_restore_deleted_projects_confirm))
+            }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) { Text(stringResource(R.string.simple_cancel)) }
+        }
+    )
+}
+
 @Composable
 fun SettingsCategory(title: String) {
     Text(

app/src/main/java/net/helcel/cowspent/persistence/CowspentServerSyncHelper.kt

@@ -6,6 +6,7 @@ import android.content.SharedPreferences
 import android.net.ConnectivityManager
 import android.util.Log
 import androidx.annotation.VisibleForTesting
+import androidx.annotation.WorkerThread
 import androidx.core.content.edit
 import androidx.core.graphics.toColorInt
 import androidx.preference.PreferenceManager
@@ -27,6 +28,7 @@ import net.helcel.cowspent.R
 import net.helcel.cowspent.android.account.AccountActivity
 import net.helcel.cowspent.android.main.BillsListViewActivity
 import net.helcel.cowspent.android.main.MainConstants
+import net.helcel.cowspent.model.DBAccountProject
 import net.helcel.cowspent.model.DBBill
 import net.helcel.cowspent.model.DBMember
 import net.helcel.cowspent.model.DBProject
@@ -1475,6 +1477,21 @@ class CowspentServerSyncHelper private constructor(private val dbHelper: Cowspen
         }
     }
 
+    @WorkerThread
+    fun deletedAccountProjects(): List<DBAccountProject> {
+        val forgotten = forgottenAccountProjects(preferences)
+        if (forgotten.isEmpty()) return emptyList()
+        return dbHelper.accountProjects.filter { accountProjectKey(it.remoteId, it.ncUrl) in forgotten }
+    }
+
+    fun restoreAccountProjects(projects: List<DBAccountProject>) {
+        if (projects.isEmpty()) return
+        val restored = projects.map { accountProjectKey(it.remoteId, it.ncUrl) }.toSet()
+        preferences.edit {
+            putStringSet(FORGOTTEN_ACCOUNT_PROJECTS, forgottenAccountProjects(preferences) - restored)
+        }
+    }
+
     fun runAccountProjectsSync() {
         Log.d(TAG, "Account projects sync requested; ${if (syncAccountProjectsActive) "sync active" else "sync NOT active"}) ...")
         updateNetworkStatus()

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

@@ -137,6 +137,9 @@
     <string name="settings_night_mode">Theme</string>
     <string name="settings_offline_mode">Offline mode</string>
     <string name="settings_offline_mode_summary">Only sync manually.</string>
+    <string name="settings_restore_deleted_projects">Restore deleted projects</string>
+    <string name="settings_restore_deleted_projects_done">Restoring from the account</string>
+    <string name="settings_restore_deleted_projects_confirm">Restore</string>
     <string name="settings_color_custom">Custom color</string>
     <string name="settings_color_mode">Color Selection</string>
     <string name="settings_show_archived">Show archived projects</string>
@@ -291,4 +294,9 @@
     <string name="share_intent_title">Project %1$s</string>
     <string name="share_chooser_title">Share %1$s</string>
 
+
+    <plurals name="settings_restore_deleted_projects_summary">
+        <item quantity="one">%d project the account offers is kept off this device.</item>
+        <item quantity="other">%d projects the account offers are kept off this device.</item>
+    </plurals>
 </resources>