Wino-Mail/Wino.Mail/Activation/FileActivationHandler.cs

using System;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Windows.ApplicationModel.Activation;
using Windows.Storage;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media.Animation;
using Wino.Core.Domain.Enums;
using Wino.Core.Domain.Interfaces;
using Wino.Core.UWP.Extensions;
using Wino.Views;

namespace Wino.Activation
{
    internal class FileActivationHandler : ActivationHandler<FileActivatedEventArgs>
    {
        private readonly INativeAppService _nativeAppService;
        private readonly IMimeFileService _mimeFileService;
        private readonly IStatePersistanceService _statePersistanceService;
        private readonly INavigationService _winoNavigationService;

        public FileActivationHandler(INativeAppService nativeAppService,
                                     IMimeFileService mimeFileService,
                                     IStatePersistanceService statePersistanceService,
                                     INavigationService winoNavigationService)
        {
            _nativeAppService = nativeAppService;
            _mimeFileService = mimeFileService;
            _statePersistanceService = statePersistanceService;
            _winoNavigationService = winoNavigationService;
        }

        protected override async Task HandleInternalAsync(FileActivatedEventArgs args)
        {
            // Always handle the last item passed.
            // Multiple files are not supported.

            var file = args.Files.Last() as StorageFile;

            // Only EML files are supported now.
            var fileExtension = Path.GetExtension(file.Path);

            if (string.Equals(fileExtension, ".eml", StringComparison.OrdinalIgnoreCase))
            {
                var fileBytes = await file.ToByteArrayAsync();
                var directoryName = Path.GetDirectoryName(file.Path);

                var messageInformation = await _mimeFileService.GetMimeMessageInformationAsync(fileBytes, directoryName).ConfigureAwait(false);

                if (_nativeAppService.IsAppRunning())
                {
                    // TODO: Activate another Window and go to mail rendering page.
                    _winoNavigationService.Navigate(WinoPage.MailRenderingPage, messageInformation, NavigationReferenceFrame.RenderingFrame);
                }
                else
                {
                    _statePersistanceService.ShouldShiftMailRenderingDesign = true;
                    (Window.Current.Content as Frame).Navigate(typeof(MailRenderingPage), messageInformation, new DrillInNavigationTransitionInfo());
                }
            }
        }

        protected override bool CanHandleInternal(FileActivatedEventArgs args) => args.Files.Any();

    }
}