Release 0.4.8 with Android file imports

Components/Pages/Home.razor

@@ -10,6 +10,7 @@
 @inject MapExportService MapExportService
 @inject CloudSyncService CloudSyncService
 @inject AppUpdateService AppUpdateService
+@inject IncomingFileService IncomingFiles
 @implements IAsyncDisposable
 
 <PageTitle>LME Mappe Catastali</PageTitle>
@@ -697,6 +698,7 @@
     private bool SyncBusy { get; set; }
     private string SyncStatus { get; set; } = "Sincronizzazione non configurata.";
     private bool UpdateBusy { get; set; }
+    private bool MapReady { get; set; }
     private string UpdateStatus { get; set; } = $"Versione installata: {AppUpdateService.CurrentVersion}";
     private string UpdateDownloadUrl { get; set; } = string.Empty;
     private string UpdateReleaseNotes { get; set; } = string.Empty;
@@ -754,6 +756,7 @@
 
     protected override async Task OnInitializedAsync()
     {
+        IncomingFiles.FileAvailable += OnIncomingFileAvailable;
         LoadFlagPreferences();
 
         try
@@ -797,12 +800,14 @@
         {
             MapCallbackReference = DotNetObjectReference.Create(this);
             await JS.InvokeVoidAsync("lmeMap.init", MapCallbackReference);
+            MapReady = true;
             await ApplyFlagPreferencesToMapAsync();
             await ApplyAdvancedOptions();
             await CenterOnInitialLocationAsync();
             await MigrateLegacyProjectAsync();
             var offlineCount = await JS.InvokeAsync<int>("lmeMap.getOfflineTileStats");
             OfflineStatus = offlineCount == 0 ? "Nessuna tessera salvata." : $"{offlineCount} tessere disponibili offline.";
+            await ProcessIncomingFilesAsync();
             await InvokeAsync(StateHasChanged);
         }
     }
@@ -1492,7 +1497,11 @@
 
     private async Task RestoreBackup()
     {
-        var file = await FilePicker.Default.PickAsync(new PickOptions { PickerTitle = "Scegli backup LME" });
+        var file = await FilePicker.Default.PickAsync(new PickOptions
+        {
+            PickerTitle = "Scegli backup LME (.lmebackup.zip)",
+            FileTypes = BackupPickerFileTypes
+        });
         if (file is null) return;
         var path = await CopyPickedFileToCacheAsync(file);
         var count = await ProjectStorageService.RestoreBackupAsync(path);
@@ -1502,7 +1511,11 @@
 
     private async Task ImportProject()
     {
-        var file = await FilePicker.Default.PickAsync(new PickOptions { PickerTitle = "Scegli progetto LME" });
+        var file = await FilePicker.Default.PickAsync(new PickOptions
+        {
+            PickerTitle = "Scegli progetto LME (.lmeproject.json)",
+            FileTypes = ProjectPickerFileTypes
+        });
         if (file is null) return;
         var path = await CopyPickedFileToCacheAsync(file);
         var imported = await ProjectStorageService.ImportProjectAsync(path);
@@ -1521,6 +1534,91 @@
         return path;
     }
 
+    private void OnIncomingFileAvailable()
+    {
+        if (MapReady) _ = InvokeAsync(ProcessIncomingFilesAsync);
+    }
+
+    private async Task ProcessIncomingFilesAsync()
+    {
+        while (IncomingFiles.TryDequeue(out var incoming) && incoming is not null)
+        {
+            try
+            {
+                var lowerName = incoming.FileName.ToLowerInvariant();
+                if (lowerName.EndsWith(".kml", StringComparison.Ordinal)
+                    || lowerName.EndsWith(".kmz", StringComparison.Ordinal)
+                    || lowerName.EndsWith(".geojson", StringComparison.Ordinal)
+                    || await IsGeoJsonAsync(incoming.Path))
+                {
+                    var content = Convert.ToBase64String(await File.ReadAllBytesAsync(incoming.Path));
+                    await JS.InvokeAsync<string>("lmeMap.importExternalGisFile", incoming.FileName, content, incoming.ContentType);
+                    continue;
+                }
+
+                if (lowerName.EndsWith(".zip", StringComparison.Ordinal))
+                {
+                    var count = await ProjectStorageService.RestoreBackupAsync(incoming.Path);
+                    await RefreshProjectsAsync();
+                    await JS.InvokeVoidAsync("lmeMap.showInfo", $"Backup aperto: {count} progetti ripristinati.");
+                    continue;
+                }
+
+                if (lowerName.EndsWith(".json", StringComparison.Ordinal))
+                {
+                    var imported = await ProjectStorageService.ImportProjectAsync(incoming.Path);
+                    await RefreshProjectsAsync();
+                    SelectedProjectId = imported.Id;
+                    await RefreshProjectVersionsAsync(true);
+                    await JS.InvokeVoidAsync("lmeMap.showInfo", $"Progetto aperto: {imported.Name}.");
+                    continue;
+                }
+
+                await JS.InvokeVoidAsync("lmeMap.showInfo", $"Formato non riconosciuto: {incoming.FileName}.");
+            }
+            catch (Exception error)
+            {
+                await JS.InvokeVoidAsync("lmeMap.showInfo", $"Impossibile aprire {incoming.FileName}: {error.GetBaseException().Message}");
+            }
+            finally
+            {
+                try { File.Delete(incoming.Path); } catch { }
+            }
+        }
+    }
+
+    private static async Task<bool> IsGeoJsonAsync(string path)
+    {
+        if (!Path.GetExtension(path).Equals(".json", StringComparison.OrdinalIgnoreCase)) return false;
+        try
+        {
+            await using var stream = File.OpenRead(path);
+            using var document = await System.Text.Json.JsonDocument.ParseAsync(stream);
+            if (!document.RootElement.TryGetProperty("type", out var typeProperty)) return false;
+            var type = typeProperty.GetString();
+            return type is "Feature" or "FeatureCollection" or "Point" or "MultiPoint"
+                or "LineString" or "MultiLineString" or "Polygon" or "MultiPolygon"
+                or "GeometryCollection";
+        }
+        catch { return false; }
+    }
+
+    private static readonly FilePickerFileType ProjectPickerFileTypes = new(new Dictionary<DevicePlatform, IEnumerable<string>>
+    {
+        [DevicePlatform.Android] = ["application/json", "text/json", "text/plain", "application/octet-stream"],
+        [DevicePlatform.WinUI] = [".json"],
+        [DevicePlatform.iOS] = ["public.json", "public.data"],
+        [DevicePlatform.macOS] = ["public.json", "public.data"]
+    });
+
+    private static readonly FilePickerFileType BackupPickerFileTypes = new(new Dictionary<DevicePlatform, IEnumerable<string>>
+    {
+        [DevicePlatform.Android] = ["application/zip", "application/x-zip-compressed", "application/octet-stream"],
+        [DevicePlatform.WinUI] = [".zip"],
+        [DevicePlatform.iOS] = ["public.zip-archive", "public.data"],
+        [DevicePlatform.macOS] = ["public.zip-archive", "public.data"]
+    });
+
     private async Task LoadProjectVersion()
     {
         if (SelectedProject is null || string.IsNullOrWhiteSpace(SelectedVersionId)) return;
@@ -2121,6 +2219,7 @@
 
     public ValueTask DisposeAsync()
     {
+        IncomingFiles.FileAvailable -= OnIncomingFileAvailable;
         CancelCatalogWork();
         LocationService.StopTracking();
         GpsLookupCancellation?.Cancel();