Show missing permission banner in weather widget if there's no weather data and auto location is enabled

ui/src/main/java/de/mm20/launcher2/ui/launcher/widgets/weather/WeatherWidget.kt

@@ -4,6 +4,7 @@ import android.content.Context
 import android.content.Intent
 import android.net.Uri
 import android.text.format.DateUtils
+import androidx.appcompat.app.AppCompatActivity
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.ExperimentalAnimationApi
 import androidx.compose.foundation.clickable
@@ -28,6 +29,7 @@ import androidx.compose.ui.unit.sp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import de.mm20.launcher2.ktx.tryStartActivity
 import de.mm20.launcher2.ui.R
+import de.mm20.launcher2.ui.component.MissingPermissionBanner
 import de.mm20.launcher2.ui.weather.AnimatedWeatherIcon
 import de.mm20.launcher2.ui.weather.WeatherIcon
 import de.mm20.launcher2.weather.DailyForecast
@@ -42,11 +44,23 @@ import kotlin.math.roundToInt
 fun WeatherWidget() {
     val viewModel: WeatherWidgetWM = viewModel()
 
+    val context = LocalContext.current
+
     val selectedForecast by viewModel.currentForecast.observeAsState()
 
     val imperialUnits by viewModel.imperialUnits.observeAsState(false)
 
     val forecast = selectedForecast ?: run {
+        val hasPermission by viewModel.hasLocationPermission.observeAsState()
+        val autoLocation by viewModel.autoLocation.observeAsState()
+        AnimatedVisibility(hasPermission == false && autoLocation == true) {
+            MissingPermissionBanner(
+                modifier = Modifier.padding(horizontal = 16.dp).padding(top = 16.dp),
+                text = stringResource(id = R.string.missing_permission_auto_location),
+                onClick = {
+                    viewModel.requestLocationPermission(context as AppCompatActivity)
+                })
+        }
         NoData()
         return
     }

ui/src/main/java/de/mm20/launcher2/ui/launcher/widgets/weather/WeatherWidgetWM.kt

@@ -1,6 +1,9 @@
 package de.mm20.launcher2.ui.launcher.widgets.weather
 
+import androidx.appcompat.app.AppCompatActivity
 import androidx.lifecycle.*
+import de.mm20.launcher2.permissions.PermissionGroup
+import de.mm20.launcher2.permissions.PermissionsManager
 import de.mm20.launcher2.preferences.LauncherDataStore
 import de.mm20.launcher2.preferences.LauncherPreferences
 import de.mm20.launcher2.weather.DailyForecast
@@ -16,12 +19,17 @@ import kotlin.math.min
 class WeatherWidgetWM : ViewModel(), KoinComponent {
     private val weatherRepository: WeatherRepository by inject()
 
+    private val permissionsManager: PermissionsManager by inject()
+
     private val dataStore: LauncherDataStore by inject()
 
     private var selectedDayIndex = 0
         set(value) {
             field = min(value, forecasts.lastIndex)
-            if (field < 0) return
+            if (field < 0) {
+                currentForecast.postValue(null)
+                return
+            }
             selectedForecastIndex = min(
                 selectedForecastIndex,
                 forecasts[value].hourlyForecasts.lastIndex
@@ -33,7 +41,10 @@ class WeatherWidgetWM : ViewModel(), KoinComponent {
 
     private var selectedForecastIndex = 0
     set(value) {
-        if (selectedDayIndex < 0) return
+        if (selectedDayIndex < 0)  {
+            currentForecast.postValue(null)
+            return
+        }
         field = min(value, forecasts[selectedDayIndex].hourlyForecasts.lastIndex)
         currentForecast.postValue(getCurrentlySelectedForecast())
     }
@@ -61,6 +72,12 @@ class WeatherWidgetWM : ViewModel(), KoinComponent {
     val currentDayForecasts = MutableLiveData<List<Forecast>>(emptyList())
     val currentDailyForecast = MutableLiveData<DailyForecast>(null)
 
+    val hasLocationPermission = permissionsManager.hasPermission(PermissionGroup.Location).asLiveData()
+    fun requestLocationPermission(context: AppCompatActivity) {
+        permissionsManager.requestPermission(context, PermissionGroup.Location)
+    }
+    val autoLocation = weatherRepository.autoLocation.asLiveData()
+
     val imperialUnits = dataStore.data.map { it.weather.imperialUnits }.asLiveData()
 
     fun selectDay(index: Int) {