feat: add drag-to-reorder category sorting with live preview in shopping list settings, persist custom category order to database

- Add `categoryOrder` field to `ShoppingListEntity` for storing custom category sequences
- Increment database version to 7
- Implement long-press drag gesture to reorder categories in `ListSortScreen` with visual feedback
- Add live preview card showing ordered categories with visibility indicators
- Apply custom category order in `ListDetailScreen` when rendering item groups
- Update `ListDetailViewModel

app/src/main/java/com/safebite/app/data/local/database/SafeBiteDatabase.kt

@@ -23,7 +23,7 @@ import com.safebite.app.data.local.database.entity.UserProfileEntity
         ShoppingListItemEntity::class,
         ShoppingListMemberEntity::class
     ],
-    version = 6,
+    version = 7,
     exportSchema = false
 )
 @TypeConverters(Converters::class)

app/src/main/java/com/safebite/app/data/local/database/entity/Entities.kt

@@ -76,7 +76,8 @@ data class ShoppingListEntity(
     val region: String? = null,
     val sortType: String = "category",
     val displayOrder: Int = 0,
-    val visibleCategories: String? = null
+    val visibleCategories: String? = null,
+    val categoryOrder: String? = null
 )
 
 @Entity(

app/src/main/java/com/safebite/app/presentation/screen/lists/ListDetailScreen.kt

@@ -418,6 +418,14 @@ private fun ListDetailContent(
         }
     }
 
+    val orderedCategories = remember(ready.list) {
+        val order = ready.list?.categoryOrder?.split(",")?.filter { it.isNotBlank() }
+        val visible = ready.list?.visibleCategories?.split(",")?.filter { it.isNotBlank() }?.toSet()
+        val base = order ?: catalog.categories
+        val filtered = if (visible != null) base.filter { it in visible } else base
+        filtered.filter { it in catalog.categories }
+    }
+
     LazyColumn(
         modifier = Modifier.fillMaxSize(),
         contentPadding = PaddingValues(
@@ -499,7 +507,7 @@ private fun ListDetailContent(
             )
         }
 
-        catalog.categories.forEach { category ->
+        orderedCategories.forEach { category ->
             val expanded = expandedCategories[category] ?: false
             item(key = "header-$category") {
                 CollapsibleHeader(

app/src/main/java/com/safebite/app/presentation/screen/lists/ListDetailViewModel.kt

@@ -15,6 +15,7 @@ import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.flatMapLatest
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 import javax.inject.Inject
@@ -47,6 +48,7 @@ class ListDetailViewModel @Inject constructor(
         data class Ready(
             val listId: Long,
             val listName: String,
+            val list: ShoppingListEntity?,
             val activeItems: List<ShoppingListItemUi>,
             val recentlyUsed: List<ShoppingListItemUi>
         ) : UiState()
@@ -117,14 +119,13 @@ class ListDetailViewModel @Inject constructor(
 
     @OptIn(ExperimentalCoroutinesApi::class)
     val state: StateFlow<UiState> = _listIdFlow.flatMapLatest { listId ->
-        combine(
+        manageListUseCase.observeItems(listId).map { items ->
-            manageListUseCase.observeItems(listId),
+            val list = getListsUseCase.getList(listId)
-            _listName
-        ) { items, listName ->
             val ui = items.map { it.toUi() }
             UiState.Ready(
                 listId = listId,
-                listName = listName,
+                listName = list?.name ?: _listName.value,
+                list = list,
                 activeItems = ui.filterNot { it.isChecked }
                     .sortedBy { it.productName.lowercase() },
                 recentlyUsed = ui.filter { it.isChecked }

app/src/main/java/com/safebite/app/presentation/screen/lists/ListsViewModel.kt

@@ -86,6 +86,12 @@ class ListsViewModel @Inject constructor(
         _isEditMode.value = !_isEditMode.value
     }
 
+    fun updateList(list: ShoppingListEntity) {
+        viewModelScope.launch {
+            getShoppingListsUseCase.updateList(list)
+        }
+    }
+
     fun reorderLists(fromIndex: Int, toIndex: Int) {
         viewModelScope.launch {
             val current = state.value as? UiState.Success ?: return@launch

app/src/main/java/com/safebite/app/presentation/screen/lists/settings/ListSortScreen.kt

@@ -2,6 +2,7 @@ package com.safebite.app.presentation.screen.lists.settings
 
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.gestures.detectDragGesturesAfterLongPress
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -9,11 +10,12 @@ import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.itemsIndexed
 import androidx.compose.foundation.shape.RoundedCornerShape
@@ -21,7 +23,6 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.Sort
 import androidx.compose.material.icons.filled.ArrowBack
 import androidx.compose.material.icons.filled.DragHandle
-import androidx.compose.material.icons.filled.MoreVert
 import androidx.compose.material.icons.filled.Visibility
 import androidx.compose.material.icons.filled.VisibilityOff
 import androidx.compose.material3.Card
@@ -34,23 +35,30 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
-import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.mutableStateOf
 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.clip
+import androidx.compose.ui.graphics.graphicsLayer
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.IntOffset
 import androidx.compose.ui.unit.dp
+import androidx.compose.ui.zIndex
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.safebite.app.R
 import com.safebite.app.domain.engine.CatalogProvider
 import com.safebite.app.presentation.screen.lists.ListsViewModel
+import kotlin.math.roundToInt
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -62,11 +70,23 @@ fun ListSortScreen(
     val state by viewModel.state.collectAsStateWithLifecycle()
     val listData = (state as? ListsViewModel.UiState.Success)?.lists?.firstOrNull { it.list.id == listId }
     val catalog = remember { CatalogProvider() }
-    var visibleCategories by remember(listData?.list?.visibleCategories) {
+
-        mutableStateOf(
+    val savedOrder = listData?.list?.categoryOrder?.split(",")?.filter { it.isNotBlank() }
-            listData?.list?.visibleCategories?.split(",")?.toSet() ?: catalog.categories.toSet()
+    val orderedCategories = remember(listData?.list?.categoryOrder) {
-        )
+        mutableStateListOf<String>().apply {
+            addAll(savedOrder ?: catalog.categories)
         }
+    }
+
+    val savedVisible = listData?.list?.visibleCategories?.split(",")?.filter { it.isNotBlank() }?.toSet()
+    var visibleCategories by remember(listData?.list?.visibleCategories) {
+        mutableStateOf(savedVisible ?: catalog.categories.toSet())
+    }
+
+    var draggedIndex by remember { mutableStateOf<Int?>(null) }
+    var dragOffsetY by remember { mutableFloatStateOf(0f) }
+    val itemHeight = 56.dp
+    val itemPx = with(LocalContext.current.resources.displayMetrics) { itemHeight.value * density }
 
     Scaffold(
         topBar = {
@@ -87,10 +107,12 @@ fun ListSortScreen(
                             .padding(end = 16.dp)
                             .clickable {
                                 listData?.let {
-                                    val updated = it.list.copy(
+                                    viewModel.updateList(
-                                        visibleCategories = visibleCategories.joinToString(",")
+                                        it.list.copy(
+                                            visibleCategories = visibleCategories.joinToString(","),
+                                            categoryOrder = orderedCategories.joinToString(",")
+                                        )
                                     )
-                                    // TODO: update via viewmodel/usecase
                                 }
                                 onBack()
                             }
@@ -112,6 +134,7 @@ fun ListSortScreen(
                 modifier = Modifier.padding(vertical = 8.dp)
             )
 
+            // Preview card
             Card(
                 modifier = Modifier
                     .fillMaxWidth()
@@ -121,10 +144,13 @@ fun ListSortScreen(
                     containerColor = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.5f)
                 )
             ) {
-                Row(
+                Column(
                     modifier = Modifier
                         .fillMaxWidth()
-                        .padding(16.dp),
+                        .padding(16.dp)
+                ) {
+                    Row(
+                        modifier = Modifier.fillMaxWidth(),
                         verticalAlignment = Alignment.CenterVertically
                     ) {
                         Icon(
@@ -139,6 +165,29 @@ fun ListSortScreen(
                             fontWeight = FontWeight.SemiBold
                         )
                     }
+                    Spacer(modifier = Modifier.height(8.dp))
+                    Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
+                        orderedCategories.forEach { category ->
+                            val isVisible = category in visibleCategories
+                            Row(
+                                modifier = Modifier.fillMaxWidth(),
+                                verticalAlignment = Alignment.CenterVertically
+                            ) {
+                                Text(
+                                    text = if (isVisible) "●" else "○",
+                                    style = MaterialTheme.typography.bodySmall,
+                                    color = if (isVisible) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.onSurfaceVariant
+                                )
+                                Spacer(modifier = Modifier.width(8.dp))
+                                Text(
+                                    text = category,
+                                    style = MaterialTheme.typography.bodySmall,
+                                    color = if (isVisible) MaterialTheme.colorScheme.onSurface else MaterialTheme.colorScheme.onSurfaceVariant
+                                )
+                            }
+                        }
+                    }
+                }
             }
 
             Spacer(modifier = Modifier.height(8.dp))
@@ -149,12 +198,57 @@ fun ListSortScreen(
                 verticalArrangement = Arrangement.spacedBy(4.dp),
                 contentPadding = PaddingValues(vertical = 8.dp)
             ) {
-                itemsIndexed(catalog.categories) { _, category ->
+                itemsIndexed(
+                    items = orderedCategories,
+                    key = { _, item -> item }
+                ) { index, category ->
+                    val isDragged = draggedIndex == index
+                    val zIndex = if (isDragged) 1f else 0f
+                    val offsetY = if (isDragged) dragOffsetY.roundToInt() else 0
+
+                    Box(
+                        modifier = Modifier
+                            .zIndex(zIndex)
+                            .offset { IntOffset(0, offsetY) }
+                            .graphicsLayer {
+                                scaleX = if (isDragged) 1.02f else 1f
+                                scaleY = if (isDragged) 1.02f else 1f
+                            }
+                            .pointerInput(Unit) {
+                                detectDragGesturesAfterLongPress(
+                                    onDragStart = { draggedIndex = index },
+                                    onDragEnd = {
+                                        draggedIndex?.let { from ->
+                                            val to = (from + (dragOffsetY / itemPx).roundToInt())
+                                                .coerceIn(0, orderedCategories.size - 1)
+                                            if (from != to) {
+                                                val moved = orderedCategories.removeAt(from)
+                                                orderedCategories.add(to, moved)
+                                            }
+                                        }
+                                        draggedIndex = null
+                                        dragOffsetY = 0f
+                                    },
+                                    onDragCancel = {
+                                        draggedIndex = null
+                                        dragOffsetY = 0f
+                                    },
+                                    onDrag = { change, dragAmount ->
+                                        change.consume()
+                                        dragOffsetY += dragAmount.y
+                                    }
+                                )
+                            }
+                    ) {
                         val isVisible = category in visibleCategories
                         Row(
                             modifier = Modifier
                                 .fillMaxWidth()
                                 .clip(RoundedCornerShape(8.dp))
+                                .background(
+                                    if (isDragged) MaterialTheme.colorScheme.primaryContainer
+                                    else MaterialTheme.colorScheme.surface
+                                )
                                 .clickable {
                                     visibleCategories = if (isVisible) {
                                         visibleCategories - category
@@ -179,14 +273,15 @@ fun ListSortScreen(
                             }) {
                                 Icon(
                                     imageVector = if (isVisible) Icons.Filled.Visibility else Icons.Filled.VisibilityOff,
-                                contentDescription = null,
+                                    contentDescription = if (isVisible) "Masquer" else "Afficher",
                                     tint = if (isVisible) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.onSurfaceVariant
                                 )
                             }
                             Icon(
                                 imageVector = Icons.Filled.DragHandle,
-                            contentDescription = null,
+                                contentDescription = "Réordonner",
-                            modifier = Modifier.padding(start = 8.dp)
+                                modifier = Modifier.padding(start = 8.dp),
+                                tint = MaterialTheme.colorScheme.onSurfaceVariant
                             )
                         }
                     }
@@ -194,3 +289,4 @@ fun ListSortScreen(
             }
         }
     }
+}

version.properties

@@ -1,4 +1,4 @@
 MAJOR=1
 MINOR=16
-PATCH=3
+PATCH=5
-CODE=23
+CODE=25