LMEMappeCatastaliProApp/Platforms/Android/MainActivity.cs

using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.Database;
using Android.OS;
using Android.Provider;
using Android.Views;
using AndroidX.Core.View;
using LMEMappeCatastaliApp.Services;

namespace LMEMappeCatastaliApp;

[Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, LaunchMode = LaunchMode.SingleTop, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]
[IntentFilter([Intent.ActionView], Categories = [Intent.CategoryDefault, Intent.CategoryBrowsable], DataMimeType = "application/json")]
[IntentFilter([Intent.ActionView], Categories = [Intent.CategoryDefault, Intent.CategoryBrowsable], DataMimeType = "application/geo+json")]
[IntentFilter([Intent.ActionView], Categories = [Intent.CategoryDefault, Intent.CategoryBrowsable], DataMimeType = "application/geojson")]
[IntentFilter([Intent.ActionView], Categories = [Intent.CategoryDefault, Intent.CategoryBrowsable], DataMimeType = "application/vnd.google-earth.kml+xml")]
[IntentFilter([Intent.ActionView], Categories = [Intent.CategoryDefault, Intent.CategoryBrowsable], DataMimeType = "application/vnd.google-earth.kmz")]
[IntentFilter([Intent.ActionView], Categories = [Intent.CategoryDefault, Intent.CategoryBrowsable], DataMimeType = "application/xml")]
[IntentFilter([Intent.ActionView], Categories = [Intent.CategoryDefault, Intent.CategoryBrowsable], DataMimeType = "text/xml")]
[IntentFilter([Intent.ActionView], Categories = [Intent.CategoryDefault, Intent.CategoryBrowsable], DataMimeType = "application/zip")]
[IntentFilter([Intent.ActionView], Categories = [Intent.CategoryDefault, Intent.CategoryBrowsable], DataMimeType = "application/x-zip-compressed")]
[IntentFilter([Intent.ActionView], Categories = [Intent.CategoryDefault, Intent.CategoryBrowsable], DataMimeType = "application/octet-stream")]
public class MainActivity : MauiAppCompatActivity
{
    protected override void OnCreate(Bundle? savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        ApplySystemBarInsets();
        QueueViewedFile(Intent);
    }

    private void ApplySystemBarInsets()
    {
        var content = FindViewById<Android.Views.View>(Android.Resource.Id.Content);
        if (content is null) return;
        ViewCompat.SetOnApplyWindowInsetsListener(content, new SystemBarInsetsListener(content));
        ViewCompat.RequestApplyInsets(content);
    }

    protected override void OnNewIntent(Intent? intent)
    {
        base.OnNewIntent(intent);
        Intent = intent;
        QueueViewedFile(intent);
    }

    private void QueueViewedFile(Intent? intent)
    {
        if (intent?.Action == Intent.ActionView && intent.Data is not null)
        {
            _ = CopyViewedFileAsync(intent);
        }
    }

    private async Task CopyViewedFileAsync(Intent intent)
    {
        try
        {
            var uri = intent.Data!;
            var fileName = ReadDisplayName(uri) ?? $"file-{Guid.NewGuid():N}";
            fileName = string.Concat(fileName.Select(character => Path.GetInvalidFileNameChars().Contains(character) ? '_' : character));
            var directory = Path.Combine(FileSystem.CacheDirectory, "Incoming");
            Directory.CreateDirectory(directory);
            var path = Path.Combine(directory, $"{Guid.NewGuid():N}-{fileName}");
            await using var input = ContentResolver!.OpenInputStream(uri)
                ?? throw new IOException("Impossibile leggere il file selezionato.");
            await using var output = File.Create(path);
            await input.CopyToAsync(output);
            IncomingFileService.Shared.Enqueue(new IncomingFile(path, fileName, intent.Type));
        }
        catch (Exception error)
        {
            System.Diagnostics.Debug.WriteLine($"Apertura file LME non riuscita: {error}");
        }
    }

    private string? ReadDisplayName(Android.Net.Uri uri)
    {
        if (uri.Scheme == ContentResolver.SchemeFile)
        {
            return Path.GetFileName(uri.Path);
        }

        using ICursor? cursor = ContentResolver?.Query(uri, [IOpenableColumns.DisplayName], null, null, null);
        if (cursor is null || !cursor.MoveToFirst())
        {
            return null;
        }

        var index = cursor.GetColumnIndex(IOpenableColumns.DisplayName);
        return index >= 0 ? cursor.GetString(index) : null;
    }

    private sealed class SystemBarInsetsListener(Android.Views.View content) : Java.Lang.Object, IOnApplyWindowInsetsListener
    {
        private readonly int _left = content.PaddingLeft;
        private readonly int _top = content.PaddingTop;
        private readonly int _right = content.PaddingRight;

        public WindowInsetsCompat? OnApplyWindowInsets(Android.Views.View? view, WindowInsetsCompat? insets)
        {
            if (view is null || insets is null) return insets;
            var systemBars = insets.GetInsets(WindowInsetsCompat.Type.SystemBars());
            view.SetPadding(
                _left,
                systemBars?.Top ?? _top,
                _right,
                systemBars?.Bottom ?? 0);
            return insets;
        }
    }
}