Kroppsvikt: datumväljare i dialogen, statistiken laddar om, graf-fix samma dag

- Vikt-dialogen har datumknapp (kalender) för både ny mätning och rättning —
  mätningar kan flyttas till rätt dag (skickas som 12:00 UTC så datumet
  inte glider över tidszoner)
- Statistikfliken hämtar om mätningarna varje gång den öppnas
- Grafen sprider mätningar inom samma dygn på index istället för att
  kollapsa till en punkt

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Kf4MAbZ3c3B4Xy5XfuGsCP

app/src/main/java/eu/brassepc/fitnessdroid/data/GymRepository.kt

@@ -183,11 +183,16 @@ class GymRepository(
     }
 
     /** Ny mätning. Faller tillbaka på gamla updateBodyWeight mot äldre API. */
-    suspend fun addBodyMeasurement(weightKg: Double) {
+    suspend fun addBodyMeasurement(weightKg: Double, dateIso: String? = null) {
         try {
             client.execute(
                 "mutation(\$input: AddBodyMeasurementInput!){addBodyMeasurement(input:\$input){id}}",
-                buildJsonObject { put("input", buildJsonObject { put("weightKg", weightKg) }) },
+                buildJsonObject {
+                    put("input", buildJsonObject {
+                        put("weightKg", weightKg)
+                        dateIso?.let { put("date", it) }
+                    })
+                },
                 auth.bearerToken(),
             )
         } catch (e: GraphQlException) {

app/src/main/java/eu/brassepc/fitnessdroid/ui/profile/ProfileScreen.kt

@@ -66,10 +66,10 @@ class ProfileViewModel(
         }
     }
 
-    fun addWeight(weightKg: Double) {
+    fun addWeight(weightKg: Double, dateIso: String?) {
         viewModelScope.launch {
             try {
-                repo.addBodyMeasurement(weightKg)
+                repo.addBodyMeasurement(weightKg, dateIso)
                 message.value = "Vikten sparad"
                 load()
             } catch (e: Exception) {
@@ -78,10 +78,10 @@ class ProfileViewModel(
         }
     }
 
-    fun updateMeasurement(id: String, weightKg: Double) {
+    fun updateMeasurement(id: String, weightKg: Double, dateIso: String?) {
         viewModelScope.launch {
             try {
-                repo.updateBodyMeasurement(id, weightKg, null)
+                repo.updateBodyMeasurement(id, weightKg, dateIso)
                 load()
             } catch (e: Exception) {
                 message.value = "Kunde inte uppdatera — offline?"
@@ -129,8 +129,9 @@ fun ProfileScreen(
         WeightDialog(
             title = "Uppdatera kroppsvikt",
             initial = profile?.bodyWeightKg,
-            onSave = { weight ->
-                viewModel.addWeight(weight)
+            initialDate = java.time.LocalDate.now(),
+            onSave = { weight, dateIso ->
+                viewModel.addWeight(weight, dateIso)
                 showAddWeight = false
             },
             onDismiss = { showAddWeight = false },
@@ -139,10 +140,12 @@ fun ProfileScreen(
 
     editTarget?.let { m ->
         WeightDialog(
-            title = "Rätta mätning ${m.date.take(10)}",
+            title = "Rätta mätning",
             initial = m.weightKg,
-            onSave = { weight ->
-                viewModel.updateMeasurement(m.id, weight)
+            initialDate = runCatching { java.time.LocalDate.parse(m.date.take(10)) }
+                .getOrElse { java.time.LocalDate.now() },
+            onSave = { weight, dateIso ->
+                viewModel.updateMeasurement(m.id, weight, dateIso)
                 editTarget = null
             },
             onDelete = {
@@ -257,19 +260,47 @@ fun ProfileScreen(
     }
 }
 
+@OptIn(androidx.compose.material3.ExperimentalMaterial3Api::class)
 @Composable
 private fun WeightDialog(
     title: String,
     initial: Double?,
-    onSave: (Double) -> Unit,
+    initialDate: java.time.LocalDate,
+    onSave: (Double, String?) -> Unit,
     onDismiss: () -> Unit,
     onDelete: (() -> Unit)? = null,
 ) {
     var text by remember {
         mutableStateOf(initial?.let { if (it % 1.0 == 0.0) it.toInt().toString() else it.toString() } ?: "")
     }
+    var date by remember { mutableStateOf(initialDate) }
+    var showDatePicker by remember { mutableStateOf(false) }
     val parsed = text.trim().replace(',', '.').toDoubleOrNull()
 
+    if (showDatePicker) {
+        val dateState = androidx.compose.material3.rememberDatePickerState(
+            initialSelectedDateMillis = date.atStartOfDay(java.time.ZoneOffset.UTC)
+                .toInstant().toEpochMilli(),
+        )
+        androidx.compose.material3.DatePickerDialog(
+            onDismissRequest = { showDatePicker = false },
+            confirmButton = {
+                TextButton(onClick = {
+                    dateState.selectedDateMillis?.let { picked ->
+                        date = java.time.Instant.ofEpochMilli(picked)
+                            .atZone(java.time.ZoneOffset.UTC).toLocalDate()
+                    }
+                    showDatePicker = false
+                }) { Text("OK") }
+            },
+            dismissButton = {
+                TextButton(onClick = { showDatePicker = false }) { Text("Avbryt") }
+            },
+        ) {
+            androidx.compose.material3.DatePicker(state = dateState)
+        }
+    }
+
     AlertDialog(
         onDismissRequest = onDismiss,
         title = { Text(title) },
@@ -283,6 +314,12 @@ private fun WeightDialog(
                     keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Decimal),
                     modifier = Modifier.fillMaxWidth(),
                 )
+                androidx.compose.material3.FilledTonalButton(
+                    onClick = { showDatePicker = true },
+                    modifier = Modifier.fillMaxWidth(),
+                ) {
+                    Text("Datum: $date")
+                }
                 onDelete?.let {
                     TextButton(onClick = it) {
                         Text("Ta bort mätningen", color = MaterialTheme.colorScheme.error)
@@ -292,7 +329,14 @@ private fun WeightDialog(
         },
         confirmButton = {
             Button(
-                onClick = { parsed?.let(onSave) },
+                onClick = {
+                    parsed?.let { weight ->
+                        // Mitt på dagen UTC så datumet inte glider en dag i någon tidszon
+                        val iso = date.atTime(12, 0).atOffset(java.time.ZoneOffset.UTC)
+                            .toInstant().toString()
+                        onSave(weight, iso)
+                    }
+                },
                 enabled = parsed != null && parsed > 0,
             ) { Text("Spara") }
         },

app/src/main/java/eu/brassepc/fitnessdroid/ui/stats/StatsScreen.kt

@@ -61,6 +61,10 @@ class StatsViewModel(private val repo: GymRepository) : ViewModel() {
 
     init {
         load()
+        refreshMeasurements()
+    }
+
+    fun refreshMeasurements() {
         viewModelScope.launch {
             runCatching { bodyMeasurements.value = repo.fetchBodyMeasurements() }
         }
@@ -95,6 +99,12 @@ fun StatsScreen(viewModel: StatsViewModel = viewModel(factory = StatsViewModel.F
     val uiState by viewModel.uiState.collectAsStateWithLifecycle()
     val period by viewModel.period.collectAsStateWithLifecycle()
 
+    // Hämta om mätningarna varje gång fliken öppnas — ny vikt kan ha
+    // lagts in via profilen sedan sist.
+    androidx.compose.runtime.LaunchedEffect(Unit) {
+        viewModel.refreshMeasurements()
+    }
+
     LazyColumn(
         modifier = Modifier.fillMaxSize(),
         contentPadding = androidx.compose.foundation.layout.PaddingValues(16.dp),

app/src/main/java/eu/brassepc/fitnessdroid/ui/stats/WeightGraph.kt

@@ -26,13 +26,19 @@ fun WeightGraph(
     pointColor: Color,
     modifier: Modifier = Modifier,
 ) {
-    val points = measurements.mapNotNull { m ->
+    var points = measurements.mapNotNull { m ->
         runCatching {
             OffsetDateTime.parse(m.date).toInstant().toEpochMilli().toFloat() to m.weightKg.toFloat()
         }.getOrNull()
     }.sortedBy { it.first }
     if (points.size < 2) return
 
+    // Alla mätningar inom samma dygn? Sprid dem jämnt på index istället,
+    // annars kollapsar hela grafen till en punkt.
+    if (points.last().first - points.first().first < 86_400_000f) {
+        points = points.mapIndexed { i, (_, w) -> i.toFloat() to w }
+    }
+
     val minX = points.first().first
     val maxX = points.last().first
     val minW = points.minOf { it.second }