postit: add mapsui location picker to rdv form

src/PostIt/Directory.Packages.props

@@ -16,6 +16,8 @@
         <PackageVersion Include="Avalonia.Headless" Version="$(AvaloniaVersionBase)" />
         <PackageVersion Include="Avalonia.Headless.Xunit" Version="$(AvaloniaVersionBase)" />
         <PackageVersion Include="Avalonia.Fonts.Inter" Version="$(AvaloniaVersionBase)" />
+        <PackageVersion Include="Mapsui" Version="5.1.0" />
+        <PackageVersion Include="Mapsui.Avalonia12" Version="5.1.0" />
 
         <PackageVersion Include="Material.Avalonia" Version="3.19.0" />
         <PackageVersion Include="AvaloniaUI.DiagnosticsSupport" Version="2.2.3" />

src/PostIt/PostIt.Tests/BillingCommandPageViewModelTests.cs

@@ -115,6 +115,26 @@ public class BillingCommandPageViewModelTests
         }
     }
 
+    [Fact]
+    public void ApplyLocationFromMap_sets_coordinates_and_updates_status()
+    {
+        var api = new RecordingApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm =
+            new CommandFormSummary { Id = 12, ActionName = "Rdv", Title = "Rendez-vous" }
+            .CreateCommandPageViewModel(
+                new ActivityInfo { Code = "dev", Name = "Développement" },
+                new ActivityUserDisplayItem { PerformerId = "perf-1", UserName = "Alice" },
+                client) as RdvViewModel;
+
+        vm!.Address = string.Empty;
+        vm.ApplyLocationFromMap(48.85661234, 2.35224567);
+
+        Assert.Equal(48.856612, vm.Latitude);
+        Assert.Equal(2.352246, vm.Longitude);
+        Assert.Contains("Position sélectionnée", vm.StatusMessage, StringComparison.OrdinalIgnoreCase);
+    }
+
     [Fact]
     public async Task InitializeAsync_loads_prestations_for_brush_and_submit_posts_selected_prestation()
     {

src/PostIt/PostIt/PostIt.csproj

@@ -29,6 +29,8 @@
       <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
       <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
     </PackageReference>
+    <PackageReference Include="Mapsui" />
+    <PackageReference Include="Mapsui.Avalonia12" />
     <PackageReference Include="CommunityToolkit.Mvvm" />
     <PackageReference Include="IdentityModel.OidcClient" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" />

src/PostIt/PostIt/ViewModels/Commands/RdvViewModel.cs

@@ -113,6 +113,20 @@ public partial class RdvViewModel : BillingCommandPageViewModel
         };
     }
 
+    public void ApplyLocationFromMap(double latitude, double longitude)
+    {
+        Latitude = Math.Round(latitude, 6);
+        Longitude = Math.Round(longitude, 6);
+
+        if (string.IsNullOrWhiteSpace(Address))
+        {
+            this.SetInfoStatus("Position sélectionnée sur la carte. Complétez l'adresse puis envoyez la commande.");
+            return;
+        }
+
+        this.SetInfoStatus("Position sélectionnée sur la carte.");
+    }
+
 
     protected override async Task SubmitAsync()
     {

src/PostIt/PostIt/Views/Commands/RdvPage.axaml

@@ -1,12 +1,13 @@
 <ContentPage xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:cvm="using:PostIt.ViewModels.Commands"
+             xmlns:mapsui="using:Mapsui.UI.Avalonia"
              xmlns:postitControls="using:PostIt.Controls"
              x:Class="PostIt.Views.Commands.RdvPage"
              x:DataType="cvm:RdvViewModel"
              Header="Commande billing">
   <ScrollViewer>
-    <Grid RowDefinitions="Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto" ColumnDefinitions="Auto,*" Margin="12">
+    <Grid RowDefinitions="Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto" ColumnDefinitions="Auto,*" Margin="12">
       <TextBlock Grid.Row="0" Grid.ColumnSpan="2"
                  Text="{Binding Title}"
                  FontSize="18"
@@ -52,6 +53,15 @@
       <TextBlock Grid.Row="9" Text="Longitude" VerticalAlignment="Center" Margin="0,0,12,8" />
       <TextBox Grid.Row="9" Grid.Column="1" Text="{Binding Longitude, Mode=TwoWay}" PlaceholderText="Optionnel" Margin="0,0,0,8" />
 
+      <TextBlock Grid.Row="10" Grid.ColumnSpan="2"
+             Text="Carte: cliquez pour positionner le rendez-vous"
+             Margin="0,0,0,8"
+             Opacity="0.85" />
+      <mapsui:MapControl Grid.Row="11"
+             Grid.ColumnSpan="2"
+             x:Name="LocationMap"
+             Height="260"
+             Margin="0,0,0,8" />
 
       <TextBlock Grid.Row="12"
                  Text="Informations"

src/PostIt/PostIt/Views/Commands/RdvPage.axaml.cs

@@ -1,17 +1,82 @@
 using Avalonia.Controls;
 using Avalonia.Markup.Xaml;
+using Mapsui;
+using Mapsui.Projections;
+using Mapsui.Tiling;
+using Mapsui.UI.Avalonia;
+using PostIt.ViewModels.Commands;
 
 namespace PostIt.Views.Commands;
 
 public partial class RdvPage : ContentPage
 {
+    private MapControl? _locationMap;
+
     public RdvPage()
     {
         InitializeComponent();
+        InitializeMap();
     }
 
     private void InitializeComponent()
     {
         AvaloniaXamlLoader.Load(this);
     }
+
+    private void InitializeMap()
+    {
+        _locationMap = this.FindControl<MapControl>("LocationMap");
+        if (_locationMap is null)
+            return;
+
+        var map = new Map();
+        map.Layers.Add(OpenStreetMap.CreateTileLayer());
+        _locationMap.Map = map;
+        _locationMap.MapTapped += OnMapTapped;
+
+        DataContextChanged += OnDataContextChanged;
+        CenterFromViewModel();
+    }
+
+    private void OnDataContextChanged(object? sender, System.EventArgs e)
+    {
+        CenterFromViewModel();
+    }
+
+    private void OnMapTapped(object? sender, MapEventArgs e)
+    {
+        if (DataContext is not RdvViewModel vm)
+            return;
+
+        var (longitude, latitude) = SphericalMercator.ToLonLat(e.WorldPosition.X, e.WorldPosition.Y);
+        vm.ApplyLocationFromMap(latitude, longitude);
+        CenterMap(latitude, longitude, zoomLevel: 13);
+    }
+
+    private void CenterFromViewModel()
+    {
+        if (DataContext is not RdvViewModel vm)
+        {
+            CenterMap(48.8566, 2.3522, zoomLevel: 4);
+            return;
+        }
+
+        if (vm.Latitude.HasValue && vm.Longitude.HasValue)
+        {
+            CenterMap(vm.Latitude.Value, vm.Longitude.Value, zoomLevel: 13);
+            return;
+        }
+
+        CenterMap(48.8566, 2.3522, zoomLevel: 4);
+    }
+
+    private void CenterMap(double latitude, double longitude, int zoomLevel)
+    {
+        if (_locationMap?.Map is null)
+            return;
+
+        var (x, y) = SphericalMercator.FromLonLat(longitude, latitude);
+        _locationMap.Map.Navigator.CenterOn(x, y);
+        _locationMap.Map.Navigator.ZoomToLevel(zoomLevel);
+    }
 }