PermissionService.cs

using Microsoft.Maui.Controls.Shapes;
using NeuroAccessMaui.CustomPermissions;
using NeuroAccessMaui.Resources.Languages;
using NeuroAccessMaui.UI;
using NeuroAccessMaui.UI.Popups.Permission;
using Waher.Runtime.Inventory;
 
namespace NeuroAccessMaui.Services.AppPermissions
{
    [Singleton]
    internal sealed class PermissionService : IPermissionService
    {
        public PermissionService()
        {
        }
 
        private static async Task<PermissionStatus> CheckAndRequestPermissionAsync<TPermission>()
             where TPermission : Permissions.BasePermission, new()
        {
            try
            {
                PermissionStatus Status = await Permissions.CheckStatusAsync<TPermission>();
 
                // On platforms other than iOS, a Denied status might be temporary,
                // so we try to request it.
                if ((Status == PermissionStatus.Denied && DeviceInfo.Platform != DevicePlatform.iOS) ||
                     Status == PermissionStatus.Unknown)
                {
                    Status = await Permissions.RequestAsync<TPermission>();
                }
                return Status;
            }
            catch (Exception)
            {
                return PermissionStatus.Unknown;
            }
        }
 
        public async Task<bool> CheckNotificationPermissionAsync(bool SkipRequest = false)
        {
            PermissionStatus Status;
 
            if (SkipRequest)
            {
                Status = await Permissions.CheckStatusAsync<NotificationPermission>();
            }
            else
            {
                Status = await CheckAndRequestPermissionAsync<NotificationPermission>();
            }
 
            if (Status == PermissionStatus.Granted)
                return true;
 
            string Title = ServiceRef.Localizer[nameof(AppResources.Notifications)];
            string Description = ServiceRef.Localizer[nameof(AppResources.NotificationPopupDescription)];
            string DescriptionSecondary = ServiceRef.Localizer[nameof(AppResources.NotificationPopupDescriptionSecondary)];
            Geometry IconGeometry = Geometries.NotificationIconPath;
 
            // Display the permission popup so the user can enable it from the settings.
            ShowPermissionViewModel ViewModel = new(Title, Description, DescriptionSecondary, IconGeometry);
            ShowPermissionPopup PermissionPopup = new(ViewModel);
 
            await ServiceRef.PopupService.PushAsync(PermissionPopup);
 
            if (SkipRequest)
            {
                Status = await Permissions.CheckStatusAsync<NotificationPermission>();
            }
            else
            {
                Status = await CheckAndRequestPermissionAsync<NotificationPermission>();
            }
 
            return Status == PermissionStatus.Granted;
        }
 
        public async Task<bool> CheckCameraPermissionAsync()
        {
            PermissionStatus Status = await CheckAndRequestPermissionAsync<Permissions.Camera>();
 
            if (Status == PermissionStatus.Granted)
                return true;
 
            string Title;
            string Description;
            string DescriptionSecondary;
            Geometry IconGeometry;
            // Prepare localized strings for the permission rationale
            if (OperatingSystem.IsAndroid())
            {
                Title = ServiceRef.Localizer[nameof(AppResources.CameraPermissionTitle)];
                Description = ServiceRef.Localizer[nameof(AppResources.CameraPermissionDescription)];
                DescriptionSecondary =
                    ServiceRef.Localizer[nameof(AppResources.CameraPermissionDescriptionSecondary)];
                IconGeometry = Geometries.CameraPhotoButtonPath;
            }
            else if(OperatingSystem.IsIOS())
            {
                Title = ServiceRef.Localizer[nameof(AppResources.CameraPermissionTitle)];
                Description = ServiceRef.Localizer[nameof(AppResources.CameraPermissionDescription)];
                DescriptionSecondary =
                    ServiceRef.Localizer[nameof(AppResources.iOS_CameraPermissionDescriptionSecondary)];
                IconGeometry = Geometries.CameraPhotoButtonPath;
            }
            else
            {
                Title = ServiceRef.Localizer[nameof(AppResources.CameraPermissionTitle)];
                Description = ServiceRef.Localizer[nameof(AppResources.CameraPermissionDescription)];
                DescriptionSecondary =
                    ServiceRef.Localizer[nameof(AppResources.CameraPermissionDescriptionSecondary)];
                IconGeometry = Geometries.CameraPhotoButtonPath;
            }
 
            // Display the permission popup so the user can enable it from the settings.
            ShowPermissionViewModel ViewModel = new(Title,Description,DescriptionSecondary, IconGeometry);
            ShowPermissionPopup PermissionPopup = new(ViewModel);
            await ServiceRef.PopupService.PushAsync(PermissionPopup);
 
            Status = await CheckAndRequestPermissionAsync<Permissions.Camera>();
 
            return Status == PermissionStatus.Granted;
 
        }
    }
}