fix: add info text when no data

app/src/main/java/cc/n0th1ng/tripmoney/data/TripDatabase.kt

@@ -49,8 +49,6 @@ abstract class TripDatabase : RoomDatabase() {
 @Module
 @InstallIn(SingletonComponent::class)
 object DatabaseModule {
-
-
     @RequiresApi(Build.VERSION_CODES.O)
     @Provides
     @Singleton
@@ -140,12 +138,12 @@ private class DatabasePrepopulator(
                 currency = "USD"
             )
         )
-        for (category in sampleCategories) {
+//        for (category in sampleCategories) {
-            categoryDao.insert(category)
+//            categoryDao.insert(category)
-        }
+//        }
-        for (expense in sampleExpenses) {
+//        for (expense in sampleExpenses) {
-            expenseDao.insert(expense)
+//            expenseDao.insert(expense)
-        }
+//        }
 
 
     }

app/src/main/java/cc/n0th1ng/tripmoney/data/entity/Trip.kt

@@ -19,6 +19,10 @@ data class Trip(
     @ColumnInfo("currency") val currency: String,
     @ColumnInfo("budget") val budget: Double = 0.0
 ) {
+    fun isDummy(): Boolean {
+        return this.id == -1
+    }
+
     companion object {
         @RequiresApi(Build.VERSION_CODES.O)
         val DUMMY = Trip(

app/src/main/java/cc/n0th1ng/tripmoney/screens/addexpense/AddExpenseBottomSheet.kt

@@ -115,9 +115,9 @@ fun AddExpenseBottomSheet(
 ) {
     val currentTripId = currentTrip.id
 
-    if (categories.isEmpty()) {
+//    if (categories.isEmpty()) {
-        return
+//        return
-    }
+//    }
 
     var amount by remember {
         mutableStateOf(
@@ -138,7 +138,11 @@ fun AddExpenseBottomSheet(
             expenseDtoToEdit?.expense?.currency ?: currentTrip.currency
         )
     }
-    var category by remember { mutableStateOf(expenseDtoToEdit?.category ?: categories[0]) }
+    var category by remember {
+        mutableStateOf<Category?>(
+            expenseDtoToEdit?.category ?: if (categories.isEmpty()) null else categories[0]
+        )
+    }
     var datetime by remember {
         mutableStateOf(
             expenseDtoToEdit?.expense?.datetime ?: LocalDateTime.now()
@@ -273,14 +277,14 @@ fun AddExpenseBottomSheet(
 
                 SaveButton(
                     modifier = Modifier.fillMaxWidth(),
-                    enabled = enableSave,
+                    enabled = enableSave && category != null,
                     onClick = {
                         val expenseToSave = Expense(
                             amount = equationResult,
                             currency = currency,
                             note = note,
                             datetime = datetime,
-                            categoryId = category.id,
+                            categoryId = category!!.id,
                             tripId = currentTripId
                         )
                         onSave(
@@ -410,7 +414,7 @@ fun CurrencyButton(modifier: Modifier = Modifier, onClick: () -> Unit, text: Str
 }
 
 @Composable
-fun CategoryButton(onClick: () -> Unit, category: Category, modifier: Modifier = Modifier) {
+fun CategoryButton(onClick: () -> Unit, category: Category?, modifier: Modifier = Modifier) {
     Button(
         contentPadding = PaddingValues(0.dp),
         onClick = onClick,
@@ -422,25 +426,21 @@ fun CategoryButton(onClick: () -> Unit, category: Category, modifier: Modifier =
                 contentColor = MaterialTheme.colorScheme.onPrimary
             )
     ) {
-//        Row(modifier = modifier.fillMaxWidth()) {
+        if (category != null) {
             Icon(
                 tint = Color(category.color.toColorInt()),
                 modifier = Modifier
                     .size(30.dp)
-//                    .background(
-//                        color = MaterialTheme.colorScheme.prima,
-//                        shape = MaterialTheme.shapes.small
-//                    )
                     .padding(end = 10.dp),
                 painter = painterResource(category.icon.resource),
                 contentDescription = stringResource(R.string.category),
             )
+        }
         Text(
-            text = category.name,
+            text = category?.name ?: stringResource(R.string.pick_category),
             style = MaterialTheme.typography.titleMedium
         )
 
-//        }
     }
 }
 

app/src/main/java/cc/n0th1ng/tripmoney/screens/listexpense/CategorySelectionDialog.kt

@@ -25,7 +25,7 @@ import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.core.graphics.toColorInt
 import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
-import cc.n0th1ng.tripmoney.R.*
+import cc.n0th1ng.tripmoney.R.string
 import cc.n0th1ng.tripmoney.data.entity.Category
 import cc.n0th1ng.tripmoney.screens.AddCategoryDialog
 import cc.n0th1ng.tripmoney.viewmodel.ExpenseAndCategoryViewModel
@@ -35,7 +35,7 @@ import com.composables.icons.materialsymbols.outlined.R
 fun CategorySelectionDialog(
     onDismiss: () -> Unit,
     onCategorySelected: (Category) -> Unit,
-    selected: Category,
+    selected: Category?,
     categories: List<Category>,
 ) {
     val expenseAndCategoryViewModel: ExpenseAndCategoryViewModel = hiltViewModel()

app/src/main/java/cc/n0th1ng/tripmoney/screens/listexpense/ListExpenseScreen.kt

@@ -47,11 +47,12 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.contentDescription
 import androidx.compose.ui.semantics.semantics
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.core.graphics.toColorInt
 import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
@@ -100,6 +101,7 @@ fun ListExpenseScreen(
     val isRecalculatingRate by tripViewModel.isRecalculating.collectAsState()
 
     ListExpenseScreen(
+        currentTrip = currentTrip,
         expensesFlow = expensesFlow,
         onSaveExpense = { expenseAndCategoryViewModel.save(it, currentTrip!!) },
         onDeleteExpense = { expenseAndCategoryViewModel.delete(it) },
@@ -114,6 +116,7 @@ fun ListExpenseScreen(
 @RequiresApi(Build.VERSION_CODES.O)
 @Composable
 fun ListExpenseScreen(
+    currentTrip: Trip?,
     expensesFlow: Flow<PagingData<ExpenseListItemUi>>,
     onSaveExpense: (Expense) -> Unit, onDeleteExpense: (Expense) -> Unit,
     isRecalculatingRate: Boolean,
@@ -137,16 +140,37 @@ fun ListExpenseScreen(
     var itemToDelete by remember { mutableStateOf<Expense?>(null) }
 
     Scaffold(floatingActionButtonPosition = FabPosition.EndOverlay, floatingActionButton = {
+        if (currentTrip != null && !currentTrip.isDummy()) {
             ExtendedFloatingActionButton(
                 onClick = { showBottomSheet = true },
                 icon = { Icon(Icons.Filled.Add, stringResource(string.add_expense)) },
                 text = { Text(text = stringResource(string.add_expense)) },
             )
+        }
     })
     {
         Box {
+            if (items.itemCount == 0) {
+                Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+                    val textToShow = if (currentTrip == null || currentTrip.isDummy()) {
+                        stringResource(string.no_trip_picked)
+                    } else {
+                        stringResource(string.no_expenses)
+                    }
+                    Text(
+                        text = textToShow,
+                        textAlign = TextAlign.Center,
+                        fontWeight = FontWeight.Light,
+                        style = MaterialTheme.typography.headlineMedium,
+                        color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.7f)
+                    )
+                }
+
+            } else {
                 LazyColumn(
-                modifier = Modifier.fillMaxSize().semantics {
+                    modifier = Modifier
+                        .fillMaxSize()
+                        .semantics {
                             contentDescription = "expensesList"
                         },
                     horizontalAlignment = Alignment.CenterHorizontally,
@@ -193,6 +217,8 @@ fun ListExpenseScreen(
                 }
             }
 
+        }
+
         if (itemToDelete != null) {
             DeleteConfirmationDialog(
                 onConfirm = {
@@ -466,6 +492,57 @@ fun PreviewListExpenseScreen() {
     TripMoneyTheme() {
         val pagingData = PagingData.from(sampleExpenseDtoWithConvertedAmountList())
         ListExpenseScreen(
+            currentTrip = Trip(
+                id = 1,
+                name = "Vacation",
+                currency = "USD",
+                startDate = LocalDate.parse("2026-01-01"),
+                endDate = LocalDate.parse("2026-01-11"),
+            ),
+            expensesFlow = MutableStateFlow(pagingData),
+            onSaveExpense = {},
+            onDeleteExpense = {},
+            isRecalculatingRate = true,
+            false,
+            {}
+        )
+
+    }
+}
+
+@RequiresApi(Build.VERSION_CODES.O)
+@AllPreviews
+@Composable
+fun PreviewListExpenseScreenWithoutExpenses() {
+    TripMoneyTheme() {
+        val pagingData = PagingData.from(emptyList<ExpenseListItemUi>())
+        ListExpenseScreen(
+            currentTrip = Trip(
+                id = 1,
+                name = "Vacation",
+                currency = "USD",
+                startDate = LocalDate.parse("2026-01-01"),
+                endDate = LocalDate.parse("2026-01-11"),
+            ),
+            expensesFlow = MutableStateFlow(pagingData),
+            onSaveExpense = {},
+            onDeleteExpense = {},
+            isRecalculatingRate = true,
+            false,
+            {}
+        )
+
+    }
+}
+
+@RequiresApi(Build.VERSION_CODES.O)
+@AllPreviews
+@Composable
+fun PreviewListExpenseScreenWithoutTrip() {
+    TripMoneyTheme() {
+        val pagingData = PagingData.from(emptyList<ExpenseListItemUi>())
+        ListExpenseScreen(
+            currentTrip = null,
             expensesFlow = MutableStateFlow(pagingData),
             onSaveExpense = {},
             onDeleteExpense = {},
@@ -480,7 +557,7 @@ fun PreviewListExpenseScreen() {
 @AllPreviews
 @Composable
 fun PreviewDeleteConfirmationDialog() {
-    TripMoneyTheme() {
+    TripMoneyTheme {
         DeleteConfirmationDialog(
             onConfirm = {},
             onCancel = {})

app/src/main/java/cc/n0th1ng/tripmoney/screens/statistics/StatisticsScreen.kt

@@ -32,6 +32,8 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.colorResource
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.core.graphics.toColorInt
 import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
@@ -85,7 +87,9 @@ fun StatisticsScreen(
     ) {
         Row(horizontalArrangement = Arrangement.spacedBy(10.dp)) {
             Summary(
-                Modifier.weight(1f), -1 * summaryAmount, tripCurrency.name,
+                Modifier.weight(1f),
+                if (summaryAmount == 0.0) 0.0 else -1 * summaryAmount,
+                tripCurrency.name,
                 stringResource(cc.n0th1ng.tripmoney.R.string.total_expenses),
                 R.drawable.materialsymbols_ic_payment_arrow_down_outlined,
                 iconColor = MaterialTheme.colorScheme.error
@@ -159,6 +163,17 @@ fun SummaryPerCategoryCard(summaryPerCategoryList: List<SummaryPerCategory>) {
         colors = CardDefaults.elevatedCardColors()
             .copy(containerColor = MaterialTheme.colorScheme.surfaceContainer)
     ) {
+        if (summaryPerCategoryList.isEmpty()) {
+            Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+                Text(
+                    text = stringResource(cc.n0th1ng.tripmoney.R.string.no_expenses_summary),
+                    textAlign = TextAlign.Center,
+                    fontWeight = FontWeight.Light,
+                    style = MaterialTheme.typography.headlineMedium,
+                    color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.7f)
+                )
+            }
+        } else {
             Column(
                 modifier = Modifier
                     .padding(15.dp)
@@ -175,6 +190,7 @@ fun SummaryPerCategoryCard(summaryPerCategoryList: List<SummaryPerCategory>) {
             }
         }
     }
+}
 
 @Composable
 fun CategoryCard(modifier: Modifier = Modifier, summaryPerCategory: SummaryPerCategory) {
@@ -238,7 +254,7 @@ fun CategoryCard(modifier: Modifier = Modifier, summaryPerCategory: SummaryPerCa
 @RequiresApi(Build.VERSION_CODES.O)
 @AllPreviews
 @Composable
-fun Preview() {
+fun PreviewStatisticScreen() {
     TripMoneyTheme {
         Scaffold {
             StatisticsScreen(
@@ -251,6 +267,25 @@ fun Preview() {
     }
 }
 
+@SuppressLint("UnusedMaterial3ScaffoldPaddingParameter")
+@RequiresApi(Build.VERSION_CODES.O)
+@AllPreviews
+@Composable
+fun PreviewStatisticScreenWithNoData() {
+    TripMoneyTheme {
+        Scaffold {
+            StatisticsScreen(
+                emptyList(),
+                summaryAmount = 0.0,
+                Currencies.entries.random(),
+                null
+            )
+        }
+    }
+}
+
+
+
 val categories = listOf(
     Category(name = "Jedzenie", icon = Icons.RESTAURANT, color = colors.random()),
     Category(name = "Transport", icon = Icons.FLIGHT, color = colors.random()),

app/src/main/java/cc/n0th1ng/tripmoney/screens/trippicker/TripPickerScreen.kt

@@ -38,14 +38,13 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.hapticfeedback.HapticFeedbackType
 import androidx.compose.ui.platform.LocalHapticFeedback
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
-import androidx.compose.ui.unit.sp
 import androidx.hilt.lifecycle.viewmodel.compose.hiltViewModel
 import androidx.navigation.NavController
 import androidx.paging.PagingData
@@ -113,6 +112,17 @@ fun TripPickerScreen(
             Icon(Icons.Filled.Add, stringResource(string.add_trip))
         }
     }) { paddingValues ->
+        if (trips.itemCount == 0) {
+            Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+                Text(
+                    text = stringResource(string.no_trip_added),
+                    textAlign = TextAlign.Center,
+                    fontWeight = FontWeight.Light,
+                    style = MaterialTheme.typography.headlineMedium,
+                    color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.7f)
+                )
+            }
+        } else {
             LazyColumn(
                 modifier = Modifier
                     .padding(horizontal = 15.dp)
@@ -138,6 +148,8 @@ fun TripPickerScreen(
                     Spacer(Modifier.height(10.dp))
                 }
             }
+        }
+
 
         if (showBottomSheet) {
             AddTripBottomSheet(
@@ -250,7 +262,8 @@ fun TripCard(
             }
             Column(
                 modifier = Modifier.padding(end = 20.dp),
-                horizontalAlignment = Alignment.End) {
+                horizontalAlignment = Alignment.End
+            ) {
                 Text(
                     trip.currency.uppercase(),
                     style = MaterialTheme.typography.titleLarge,
@@ -308,3 +321,19 @@ fun PreviewTripPickerScreen() {
         )
     }
 }
+
+@RequiresApi(Build.VERSION_CODES.O)
+@AllPreviews
+@Composable
+fun PreviewTripPickerScreenNoTrip() {
+
+    TripMoneyTheme {
+        TripPickerScreen(
+            tripsFlow = MutableStateFlow(PagingData.from(emptyList())),
+            currentTripId = 1,
+            onDelete = {},
+            onClick = {},
+            onSave = {}
+        )
+    }
+}

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

@@ -41,4 +41,8 @@
     <string name="add_expense_settings">Open add expense form on startup</string>
     <string name="yesterday">Yesterday</string>
     <string name="clear">Clear</string>
+    <string name="no_expenses">Start budgeting by adding expenses</string>
+    <string name="no_trip_picked">Select trip to see expenses</string>
+    <string name="no_trip_added">Start budgeting by adding your trip</string>
+    <string name="no_expenses_summary">No expenses to summarize</string>
 </resources>