Wetterdienst: Verhersage verlängert, Anzeige im Stundenplan.

LehrerApp.Desktop/ViewModels/Planning/SchoolDayWeatherSummary.cs

@@ -0,0 +1,154 @@
+using LehrerApp.Core.Models;
+
+namespace LehrerApp.Desktop.ViewModels.Planning;
+
+public enum SchoolDayWeatherKind { Sunny, Cloudy, Rain, Storm, Thunderstorm }
+
+/// <summary>Verdichtet die stündliche MOSMIX-Prognose auf ein planungsrelevantes Schultagsymbol.
+/// Extremere Bedingungen haben bewusst Vorrang vor Mittelwerten.</summary>
+public sealed class SchoolDayWeatherSummary
+{
+    public DateOnly Date { get; init; }
+    public SchoolDayWeatherKind Kind { get; init; }
+    public double? MinTemperatureC { get; init; }
+    public double? MaxTemperatureC { get; init; }
+    public double PrecipitationMm { get; init; }
+    public double? MaxWindGustKmh { get; init; }
+    public IReadOnlyList<WeatherWarning> Warnings { get; init; } = [];
+
+    public string Symbol => Kind switch
+    {
+        SchoolDayWeatherKind.Thunderstorm => "⛈️",
+        SchoolDayWeatherKind.Storm => "💨",
+        SchoolDayWeatherKind.Rain => "🌧️",
+        SchoolDayWeatherKind.Cloudy => "☁️",
+        _ => "☀️",
+    };
+
+    public string Label => Kind switch
+    {
+        SchoolDayWeatherKind.Thunderstorm => "Gewitter",
+        SchoolDayWeatherKind.Storm => "Sturm",
+        SchoolDayWeatherKind.Rain => "Regen",
+        SchoolDayWeatherKind.Cloudy => "Bewölkt",
+        _ => "Sonnig",
+    };
+
+    public string Tooltip
+    {
+        get
+        {
+            var lines = new List<string> { Label };
+            if (MinTemperatureC is { } min && MaxTemperatureC is { } max)
+                lines.Add(Math.Abs(max - min) < 0.05 ? $"{min:0.#} °C" : $"{min:0.#}–{max:0.#} °C");
+            if (PrecipitationMm >= 0.05) lines.Add($"Niederschlag: {PrecipitationMm:0.#} mm");
+            if (MaxWindGustKmh is { } gust) lines.Add($"Max. Böen: {gust:0.#} km/h");
+            foreach (var warning in Warnings)
+            {
+                var period = WarningPeriod(warning);
+                lines.Add($"⚠ {warning.Headline}{(period.Length > 0 ? $" ({period})" : "")}");
+                if (!string.IsNullOrWhiteSpace(warning.Instruction)) lines.Add(warning.Instruction.Trim());
+            }
+            return string.Join("\n", lines);
+        }
+    }
+
+    public static SchoolDayWeatherSummary? From(WeatherSnapshot snapshot, DateOnly date)
+    {
+        var allHours = snapshot.Forecast
+            .Where(x => DateOnly.FromDateTime(Local(x.ValidAt)) == date)
+            .ToList();
+        // Für die Unterrichtsplanung zählt vor allem der Zeitraum, in dem Schule stattfindet.
+        // Falls MOSMIX für diesen Zeitraum noch keine Werte liefert, bleibt der Tagesrest nutzbar.
+        var schoolHours = allHours.Where(x =>
+        {
+            var hour = Local(x.ValidAt).Hour;
+            return hour >= 6 && hour <= 18;
+        }).ToList();
+        var hours = schoolHours.Count > 0 ? schoolHours : allHours;
+        if (hours.Count == 0) return null;
+
+        var warnings = snapshot.Warnings.Where(x => WarningTouchesDate(x, date)).ToList();
+        var codes = hours.Where(x => x.WeatherCode.HasValue).Select(x => x.WeatherCode!.Value).ToList();
+        var precipitation = hours.Sum(x => x.PrecipitationMm ?? 0);
+        var gust = hours.Where(x => x.WindGustKmh.HasValue).Select(x => x.WindGustKmh!.Value).DefaultIfEmpty().Max();
+        var hasGust = hours.Any(x => x.WindGustKmh.HasValue);
+        var warningText = string.Join(" ", warnings.SelectMany(x => new[] { x.Event, x.Headline }));
+
+        var kind = codes.Any(x => x is >= 95 and <= 99) ||
+                   warningText.Contains("GEWITTER", StringComparison.OrdinalIgnoreCase)
+            ? SchoolDayWeatherKind.Thunderstorm
+            : (hasGust && gust >= 62) || ContainsStormWarning(warningText)
+                ? SchoolDayWeatherKind.Storm
+                : precipitation >= 0.2 || codes.Any(IsRainCode)
+                    ? SchoolDayWeatherKind.Rain
+                    : IsCloudy(hours, codes)
+                        ? SchoolDayWeatherKind.Cloudy
+                        : SchoolDayWeatherKind.Sunny;
+
+        var temperatures = hours.Where(x => x.TemperatureC.HasValue)
+            .Select(x => x.TemperatureC!.Value).ToList();
+        return new SchoolDayWeatherSummary
+        {
+            Date = date,
+            Kind = kind,
+            MinTemperatureC = temperatures.Count > 0 ? temperatures.Min() : null,
+            MaxTemperatureC = temperatures.Count > 0 ? temperatures.Max() : null,
+            PrecipitationMm = Math.Round(precipitation, 1, MidpointRounding.AwayFromZero),
+            MaxWindGustKmh = hasGust ? Math.Round(gust, 1, MidpointRounding.AwayFromZero) : null,
+            Warnings = warnings,
+        };
+    }
+
+    public static bool WarningTouchesDate(WeatherWarning warning, DateOnly date)
+    {
+        if (warning.Onset is null && warning.Expires is null) return false;
+        var start = warning.Onset is { } onset ? Local(onset) : Local(warning.Expires!.Value).AddHours(-12);
+        var end = warning.Expires is { } expires ? Local(expires) : start.AddHours(12);
+        var dayStart = date.ToDateTime(TimeOnly.MinValue);
+        var dayEnd = date.ToDateTime(TimeOnly.MaxValue);
+        return start <= dayEnd && end >= dayStart;
+    }
+
+    public static string WarningPeriod(WeatherWarning warning)
+    {
+        var onset = warning.Onset is { } start ? Local(start) : (DateTime?)null;
+        var expires = warning.Expires is { } end ? Local(end) : (DateTime?)null;
+        return (onset, expires) switch
+        {
+            ({ } a, { } b) when DateOnly.FromDateTime(a) == DateOnly.FromDateTime(b) =>
+                $"{a:dd.MM., HH:mm}–{b:HH:mm} Uhr",
+            ({ } a, { } b) => $"{a:dd.MM., HH:mm}–{b:dd.MM., HH:mm} Uhr",
+            ({ } a, null) => $"ab {a:dd.MM., HH:mm} Uhr",
+            (null, { } b) => $"bis {b:dd.MM., HH:mm} Uhr",
+            _ => "",
+        };
+    }
+
+    private static bool IsRainCode(int code) => code is >= 51 and <= 67 or >= 80 and <= 82;
+
+    private static bool IsCloudy(IEnumerable<WeatherForecastHour> hours, IEnumerable<int> codes)
+    {
+        var cloudValues = hours.Where(x => x.CloudCoverPercent.HasValue)
+            .Select(x => x.CloudCoverPercent!.Value).ToList();
+        return codes.Any(x => x is 2 or 3 or 45 or 48) ||
+               cloudValues.Count > 0 && cloudValues.Average() >= 60;
+    }
+
+    private static bool ContainsStormWarning(string text) =>
+        text.Contains("STURM", StringComparison.OrdinalIgnoreCase) ||
+        text.Contains("ORKAN", StringComparison.OrdinalIgnoreCase) ||
+        text.Contains("WIND", StringComparison.OrdinalIgnoreCase) ||
+        text.Contains("BÖEN", StringComparison.OrdinalIgnoreCase);
+
+    private static DateTime Local(DateTime value) => value.Kind == DateTimeKind.Utc
+        ? value.ToLocalTime() : value;
+}
+
+public sealed class WeekWeatherWarningItem(WeatherWarning warning)
+{
+    public string Headline { get; } = string.IsNullOrWhiteSpace(warning.Headline) ? warning.Event : warning.Headline;
+    public string PeriodDisplay { get; } = SchoolDayWeatherSummary.WarningPeriod(warning);
+    public string Tooltip { get; } = string.Join("\n", new[] { warning.Description, warning.Instruction }
+        .Where(x => !string.IsNullOrWhiteSpace(x)));
+}

LehrerApp.Desktop/ViewModels/Planning/TimetableViewModel.cs

@@ -65,6 +65,9 @@ public partial class TimetableViewModel : ObservableObject
     private readonly ISubstitutionEntryRepository _substitutions;
     private readonly IUntisSlotMappingRepository _untisMappings;
     private readonly WebUntisSettingsService _untisSettings;
+    private readonly SchoolWeatherService? _schoolWeather;
+    private readonly SemaphoreSlim _weatherGate = new(1, 1);
+    private WeatherSnapshot? _weatherSnapshot;
 
     public ObservableCollection<TimetableCellItem> Cells { get; } = [];
     public ObservableCollection<WeekCellItem> WeekItems { get; } = [];
@@ -73,6 +76,7 @@ public partial class TimetableViewModel : ObservableObject
     public ObservableCollection<TodaySupervisionItem> TodaySupervisions { get; } = [];
     public ObservableCollection<TodaySpecialAssignmentItem> TodaySpecialAssignments { get; } = [];
     public ObservableCollection<UpcomingExamItem> UpcomingExams { get; } = [];
+    public ObservableCollection<WeekWeatherWarningItem> WeekWeatherWarnings { get; } = [];
 
     /// Cells/WeekItems zeilenweise gruppiert (GridColumns Zellen je Zeile), zusätzlich zur
     /// flachen Liste - Grundlage für die zeilenweise Höhensteuerung in der View (Aufsicht-Zeilen
@@ -108,13 +112,15 @@ public partial class TimetableViewModel : ObservableObject
         ISchoolHolidayRepository schoolHolidays, SchoolCalendarSettingsService calendarSettings,
         PublicHolidayService publicHolidays, SchoolYearService schoolYear,
         ISupervisionDutyRepository supervisionDuties, ISubstitutionEntryRepository substitutions,
-        IUntisSlotMappingRepository untisMappings, WebUntisSettingsService untisSettings)
+        IUntisSlotMappingRepository untisMappings, WebUntisSettingsService untisSettings,
+        SchoolWeatherService? schoolWeather = null)
     {
         _slots = slots; _groups = groups; _subjects = subjects; _lessons = lessons; _exams = exams;
         _schoolHolidays = schoolHolidays; _calendarSettings = calendarSettings;
         _publicHolidays = publicHolidays; _schoolYear = schoolYear;
         _supervisionDuties = supervisionDuties; _substitutions = substitutions;
         _untisMappings = untisMappings; _untisSettings = untisSettings;
+        _schoolWeather = schoolWeather;
         Load();
     }
 
@@ -152,12 +158,58 @@ public partial class TimetableViewModel : ObservableObject
 
         BuildGrid(holidayBadges, duties);
         BuildWeekOverview(today, publicHolidayDates, duties);
+        ApplyWeatherToWeekHeaders(today);
+        _ = LoadWeatherAsync(today);
         BuildToday(today);
         BuildHoursWarnings();
         BuildUpcomingExams(today);
         LoadUntisMismatch();
     }
 
+    private async Task LoadWeatherAsync(DateOnly today)
+    {
+        if (_schoolWeather?.IsAvailable != true) return;
+        if (_weatherSnapshot is not null &&
+            DateTime.UtcNow - _weatherSnapshot.RetrievedAt.ToUniversalTime() < TimeSpan.FromMinutes(5))
+            return;
+        if (!await _weatherGate.WaitAsync(0)) return;
+        try
+        {
+            _weatherSnapshot = await _schoolWeather.GetWeatherAsync();
+            ApplyWeatherToWeekHeaders(today);
+        }
+        catch (SchoolWeatherException) { /* Wetter ist eine optionale Planungshilfe. */ }
+        finally { _weatherGate.Release(); }
+    }
+
+    private void ApplyWeatherToWeekHeaders(DateOnly today)
+    {
+        WeekWeatherWarnings.Clear();
+        var datedHeaders = WeekItems.Where(x => x.IsHeader && x.Date.HasValue).ToList();
+        foreach (var header in datedHeaders)
+        {
+            var date = header.Date!.Value;
+            var warnings = _weatherSnapshot?.Warnings
+                .Where(x => date >= today && SchoolDayWeatherSummary.WarningTouchesDate(x, date))
+                .ToList() ?? [];
+            var summary = date >= today && _weatherSnapshot is not null
+                ? SchoolDayWeatherSummary.From(_weatherSnapshot, date)
+                : null;
+            header.SetWeather(summary, warnings);
+        }
+
+        if (_weatherSnapshot is null || datedHeaders.Count == 0) return;
+        var from = datedHeaders.Min(x => x.Date!.Value);
+        var until = datedHeaders.Max(x => x.Date!.Value);
+        foreach (var warning in _weatherSnapshot.Warnings
+                     .Where(x => Enumerable.Range(0, until.DayNumber - from.DayNumber + 1)
+                         .Select(from.AddDays)
+                         .Any(date => date >= today && SchoolDayWeatherSummary.WarningTouchesDate(x, date)))
+                     .DistinctBy(x => x.Identifier)
+                     .OrderBy(x => x.Onset))
+            WeekWeatherWarnings.Add(new WeekWeatherWarningItem(warning));
+    }
+
     private void LoadUntisMismatch()
     {
         if (!_untisSettings.Enabled || !_untisSettings.IsConfigured) { HasUntisMismatch = false; return; }
@@ -689,7 +741,7 @@ public class TimetableRowItem(IReadOnlyList<TimetableCellItem> cells)
 }
 
 /// <summary>Zelle im schreibgeschützten Wochenraster der "Heute"-Ansicht.</summary>
-public class WeekCellItem
+public partial class WeekCellItem : ObservableObject
 {
     public bool IsHeader { get; private init; }
     public bool IsPeriodLabel { get; private init; }
@@ -705,6 +757,7 @@ public class WeekCellItem
     public DayOfWeek? Weekday { get; private init; }
     public int PeriodNumber { get; private init; }
     public bool IsToday { get; private init; }
+    public DateOnly? Date { get; private init; }
     public Guid GroupId { get; private init; }
     public string SubjectLabel { get; private init; } = "";
     public string GroupName { get; private init; } = "";
@@ -726,6 +779,20 @@ public class WeekCellItem
     /// Grundlage für den Direktsprung in den Verlaufsplan-Viewer (4.5.2).
     public Lesson? Lesson { get; private init; }
     public string OpenButtonLabel => Lesson is not null ? "Verlaufsplan ansehen" : "Zur Lerngruppe";
+    [ObservableProperty] private string _weatherSymbol = "";
+    [ObservableProperty] private string _weatherTooltip = "";
+    [ObservableProperty] private bool _hasWeatherWarning;
+    public bool HasWeather => WeatherSymbol.Length > 0;
+
+    partial void OnWeatherSymbolChanged(string value) => OnPropertyChanged(nameof(HasWeather));
+
+    public void SetWeather(SchoolDayWeatherSummary? summary, IReadOnlyList<WeatherWarning> warnings)
+    {
+        WeatherSymbol = summary?.Symbol ?? "";
+        WeatherTooltip = summary?.Tooltip ?? string.Join("\n", warnings.Select(x =>
+            $"⚠ {x.Headline} ({SchoolDayWeatherSummary.WarningPeriod(x)})"));
+        HasWeatherWarning = warnings.Count > 0;
+    }
 
     public static WeekCellItem Corner() => new() { IsHeader = true };
 
@@ -733,6 +800,7 @@ public class WeekCellItem
     {
         IsHeader = true,
         IsToday = isToday,
+        Date = date,
         Text = (day switch
         {
             DayOfWeek.Monday => "Mo", DayOfWeek.Tuesday => "Di", DayOfWeek.Wednesday => "Mi",

LehrerApp.Desktop/Views/Planning/TimetableView.axaml

@@ -154,6 +154,24 @@
                         ToolTip.Tip="Einstellungen (Ferien, Aufsichten, Stundenraster)"/>
               </Grid>
 
+              <Border Background="#33F59E0B" BorderBrush="#F59E0B" BorderThickness="1"
+                      CornerRadius="6" Padding="10,7" IsVisible="{Binding WeekWeatherWarnings.Count}">
+                <StackPanel Spacing="4">
+                  <TextBlock Text="⚠ AMTLICHE WETTERWARNUNGEN" FontSize="11" FontWeight="Bold"/>
+                  <ItemsControl ItemsSource="{Binding WeekWeatherWarnings}">
+                    <ItemsControl.ItemTemplate>
+                      <DataTemplate x:DataType="vm:WeekWeatherWarningItem">
+                        <TextBlock FontSize="11" TextWrapping="Wrap" Margin="0,1"
+                                   ToolTip.Tip="{Binding Tooltip}">
+                          <Run Text="{Binding PeriodDisplay}" FontWeight="SemiBold"/><Run Text=" · "/>
+                          <Run Text="{Binding Headline}"/>
+                        </TextBlock>
+                      </DataTemplate>
+                    </ItemsControl.ItemTemplate>
+                  </ItemsControl>
+                </StackPanel>
+              </Border>
+
               <!-- Zeilenweise (WeekRows) statt eines einzigen flachen UniformGrid: so kann jede
                    Zeile ihre eigene Höhe haben (RowHeight je WeekRowItem) - Aufsicht-Zeilen
                    deutlich schmaler als Stunden-/Kopfzeilen. Grid.RowDefinitions lässt sich in
@@ -173,8 +191,16 @@
                           <Grid Margin="2">
                             <Border Classes="weekheader" Classes.today="{Binding IsToday}" CornerRadius="4"
                                     IsVisible="{Binding IsHeader}">
-                              <TextBlock Text="{Binding Text}" FontWeight="SemiBold" FontSize="12" Opacity="0.75"
-                                         HorizontalAlignment="Center" VerticalAlignment="Center" Margin="4"/>
+                              <StackPanel Orientation="Horizontal" Spacing="5"
+                                          HorizontalAlignment="Center" VerticalAlignment="Center" Margin="4">
+                                <TextBlock Text="{Binding Text}" FontWeight="SemiBold" FontSize="12" Opacity="0.75"
+                                           VerticalAlignment="Center"/>
+                                <TextBlock Text="{Binding WeatherSymbol}" FontSize="16" VerticalAlignment="Center"
+                                           IsVisible="{Binding HasWeather}" ToolTip.Tip="{Binding WeatherTooltip}"/>
+                                <TextBlock Text="⚠" FontSize="12" Foreground="#D85A30" FontWeight="Bold"
+                                           VerticalAlignment="Center" IsVisible="{Binding HasWeatherWarning}"
+                                           ToolTip.Tip="{Binding WeatherTooltip}"/>
+                              </StackPanel>
                             </Border>
                             <TextBlock Text="{Binding Text}" IsVisible="{Binding IsPeriodLabel}"
                                        FontWeight="SemiBold" FontSize="13"