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Add photo detail page.
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423
Marechai.App/Presentation/ViewModels/PhotoDetailViewModel.cs
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423
Marechai.App/Presentation/ViewModels/PhotoDetailViewModel.cs
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/******************************************************************************
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// MARECHAI: Master repository of computing history artifacts information
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// ----------------------------------------------------------------------------
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//
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2003-2026 Natalia Portillo
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*******************************************************************************/
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#nullable enable
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Threading.Tasks;
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using Windows.Storage.Streams;
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using Humanizer;
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using Marechai.App.Services;
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using Marechai.App.Services.Caching;
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using Microsoft.UI.Xaml.Media.Imaging;
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using Uno.Extensions.Navigation;
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using ColorSpace = Marechai.Data.ColorSpace;
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using Contrast = Marechai.Data.Contrast;
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using ExposureMode = Marechai.Data.ExposureMode;
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using ExposureProgram = Marechai.Data.ExposureProgram;
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using Flash = Marechai.Data.Flash;
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using LightSource = Marechai.Data.LightSource;
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using MeteringMode = Marechai.Data.MeteringMode;
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using Orientation = Marechai.Data.Orientation;
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using ResolutionUnit = Marechai.Data.ResolutionUnit;
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using Saturation = Marechai.Data.Saturation;
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using SceneCaptureType = Marechai.Data.SceneCaptureType;
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using SensingMethod = Marechai.Data.SensingMethod;
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using Sharpness = Marechai.Data.Sharpness;
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using SubjectDistanceRange = Marechai.Data.SubjectDistanceRange;
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using WhiteBalance = Marechai.Data.WhiteBalance;
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namespace Marechai.App.Presentation.ViewModels;
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/// <summary>
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/// Navigation parameter for photo detail page
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/// </summary>
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public class PhotoDetailNavigationParameter
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{
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public Guid PhotoId { get; set; }
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}
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public partial class PhotoDetailViewModel : ObservableObject
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{
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private readonly ComputersService _computersService;
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private readonly ILogger<PhotoDetailViewModel> _logger;
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private readonly INavigator _navigator;
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private readonly MachinePhotoCache _photoCache;
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[ObservableProperty]
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private string _errorMessage = string.Empty;
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[ObservableProperty]
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private bool _errorOccurred;
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[ObservableProperty]
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private bool _isLoading;
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[ObservableProperty]
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private bool _isPortrait = true;
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// EXIF Camera Settings
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[ObservableProperty]
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private string _photoAperture = string.Empty;
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[ObservableProperty]
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private string _photoAuthor = string.Empty;
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[ObservableProperty]
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private string _photoCameraManufacturer = string.Empty;
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[ObservableProperty]
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private string _photoCameraModel = string.Empty;
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// Photo Properties
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[ObservableProperty]
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private string _photoColorSpace = string.Empty;
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[ObservableProperty]
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private string _photoComments = string.Empty;
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[ObservableProperty]
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private string _photoContrast = string.Empty;
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[ObservableProperty]
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private string _photoCreationDate = string.Empty;
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[ObservableProperty]
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private string _photoDigitalZoomRatio = string.Empty;
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[ObservableProperty]
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private string _photoExifVersion = string.Empty;
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[ObservableProperty]
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private string _photoExposureMode = string.Empty;
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[ObservableProperty]
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private string _photoExposureProgram = string.Empty;
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[ObservableProperty]
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private string _photoExposureTime = string.Empty;
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[ObservableProperty]
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private string _photoFlash = string.Empty;
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[ObservableProperty]
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private string _photoFocalLength = string.Empty;
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[ObservableProperty]
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private string _photoFocalLengthEquivalent = string.Empty;
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// Resolution and Other
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[ObservableProperty]
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private string _photoHorizontalResolution = string.Empty;
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[ObservableProperty]
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private BitmapImage? _photoImageSource;
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[ObservableProperty]
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private string _photoIsoRating = string.Empty;
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[ObservableProperty]
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private string _photoLensModel = string.Empty;
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[ObservableProperty]
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private string _photoLicenseName = string.Empty;
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[ObservableProperty]
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private string _photoLightSource = string.Empty;
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[ObservableProperty]
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private string _photoMachineCompany = string.Empty;
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[ObservableProperty]
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private string _photoMachineName = string.Empty;
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[ObservableProperty]
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private string _photoMeteringMode = string.Empty;
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[ObservableProperty]
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private string _photoOrientation = string.Empty;
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[ObservableProperty]
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private string _photoOriginalExtension = string.Empty;
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[ObservableProperty]
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private string _photoResolutionUnit = string.Empty;
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[ObservableProperty]
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private string _photoSaturation = string.Empty;
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[ObservableProperty]
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private string _photoSceneCaptureType = string.Empty;
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[ObservableProperty]
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private string _photoSensingMethod = string.Empty;
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[ObservableProperty]
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private string _photoSharpness = string.Empty;
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[ObservableProperty]
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private string _photoSoftwareUsed = string.Empty;
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[ObservableProperty]
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private string _photoSource = string.Empty;
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[ObservableProperty]
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private string _photoSubjectDistanceRange = string.Empty;
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[ObservableProperty]
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private string _photoUploadDate = string.Empty;
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[ObservableProperty]
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private string _photoVerticalResolution = string.Empty;
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[ObservableProperty]
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private string _photoWhiteBalance = string.Empty;
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public PhotoDetailViewModel(ILogger<PhotoDetailViewModel> logger, INavigator navigator,
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ComputersService computersService, MachinePhotoCache photoCache)
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{
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_logger = logger;
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_navigator = navigator;
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_computersService = computersService;
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_photoCache = photoCache;
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}
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[RelayCommand]
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public async Task GoBack()
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{
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await _navigator.GoBack(this);
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}
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[RelayCommand]
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public async Task LoadPhoto(Guid photoId)
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{
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try
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{
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IsLoading = true;
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ErrorOccurred = false;
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ErrorMessage = string.Empty;
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PhotoImageSource = null;
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_logger.LogInformation("Loading photo details for {PhotoId}", photoId);
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// Fetch photo details from API
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MachinePhotoDto? photo = await _computersService.GetMachinePhotoDetailsAsync(photoId);
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if(photo is null)
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{
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ErrorOccurred = true;
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ErrorMessage = "Photo not found";
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IsLoading = false;
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return;
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}
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// Populate photo information
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PhotoAuthor = photo.Author ?? string.Empty;
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PhotoCameraManufacturer = photo.CameraManufacturer ?? string.Empty;
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PhotoCameraModel = photo.CameraModel ?? string.Empty;
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PhotoComments = photo.Comments ?? string.Empty;
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PhotoLensModel = photo.Lens ?? string.Empty;
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PhotoLicenseName = photo.LicenseName ?? string.Empty;
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PhotoMachineCompany = photo.MachineCompanyName ?? string.Empty;
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PhotoMachineName = photo.MachineName ?? string.Empty;
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PhotoOriginalExtension = photo.OriginalExtension ?? string.Empty;
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if(photo.CreationDate.HasValue)
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PhotoCreationDate = photo.CreationDate.Value.ToString("MMMM d, yyyy 'at' HH:mm");
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// EXIF Camera Settings
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PhotoAperture = photo.Aperture != null ? $"f/{photo.Aperture}" : string.Empty;
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PhotoExposureTime = photo.Exposure != null ? $"{photo.Exposure}s" : string.Empty;
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PhotoExposureMode =
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ExtractAndHumanizeEnum(photo.ExposureMethod?.MachinePhotoDtoExposureMethodMember1?.AdditionalData,
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typeof(ExposureMode));
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PhotoExposureProgram = photo.ExposureProgram?.ExposureProgram != null
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? ((ExposureProgram)ExtractInt(photo.ExposureProgram.ExposureProgram
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.AdditionalData)).Humanize()
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: string.Empty;
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PhotoFocalLength = photo.FocalLength != null ? $"{photo.FocalLength}mm" : string.Empty;
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PhotoFocalLengthEquivalent = photo.FocalEquivalent != null ? $"{photo.FocalEquivalent}mm" : string.Empty;
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PhotoIsoRating = photo.Iso != null ? photo.Iso.ToString() : string.Empty;
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PhotoFlash = photo.Flash?.Flash != null
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? ((Flash)ExtractInt(photo.Flash.Flash.AdditionalData)).Humanize()
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: string.Empty;
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PhotoLightSource = photo.LightSource?.LightSource != null
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? ((LightSource)ExtractInt(photo.LightSource.LightSource.AdditionalData)).Humanize()
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: string.Empty;
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PhotoMeteringMode = photo.MeteringMode?.MeteringMode != null
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? ((MeteringMode)ExtractInt(photo.MeteringMode.MeteringMode.AdditionalData))
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.Humanize()
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: string.Empty;
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PhotoWhiteBalance = photo.WhiteBalance?.WhiteBalance != null
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? ((WhiteBalance)ExtractInt(photo.WhiteBalance.WhiteBalance.AdditionalData))
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.Humanize()
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: string.Empty;
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// Photo Properties
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PhotoColorSpace = ExtractAndHumanizeEnum(photo.Colorspace?.MachinePhotoDtoColorspaceMember1?.AdditionalData,
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typeof(ColorSpace));
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PhotoContrast = photo.Contrast?.Contrast != null
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? ((Contrast)ExtractInt(photo.Contrast.Contrast.AdditionalData)).Humanize()
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: string.Empty;
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PhotoSaturation = photo.Saturation?.Saturation != null
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? ((Saturation)ExtractInt(photo.Saturation.Saturation.AdditionalData)).Humanize()
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: string.Empty;
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PhotoSharpness = photo.Sharpness?.Sharpness != null
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? ((Sharpness)ExtractInt(photo.Sharpness.Sharpness.AdditionalData)).Humanize()
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: string.Empty;
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PhotoOrientation = photo.Orientation?.Orientation != null
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? ((Orientation)ExtractInt(photo.Orientation.Orientation.AdditionalData)).Humanize()
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: string.Empty;
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PhotoSceneCaptureType = photo.SceneCaptureType?.SceneCaptureType != null
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? ((SceneCaptureType)ExtractInt(photo.SceneCaptureType.SceneCaptureType
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.AdditionalData)).Humanize()
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: string.Empty;
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PhotoSensingMethod = photo.SensingMethod?.SensingMethod != null
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? ((SensingMethod)ExtractInt(photo.SensingMethod.SensingMethod.AdditionalData))
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.Humanize()
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: string.Empty;
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PhotoSubjectDistanceRange = photo.SubjectDistanceRange?.SubjectDistanceRange != null
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? ((SubjectDistanceRange)ExtractInt(photo.SubjectDistanceRange
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.SubjectDistanceRange
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.AdditionalData)).Humanize()
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: string.Empty;
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// Resolution and Other
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PhotoHorizontalResolution =
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photo.HorizontalResolution != null ? $"{photo.HorizontalResolution} DPI" : string.Empty;
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PhotoVerticalResolution =
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photo.VerticalResolution != null ? $"{photo.VerticalResolution} DPI" : string.Empty;
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PhotoResolutionUnit = photo.ResolutionUnit?.ResolutionUnit != null
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? ((ResolutionUnit)ExtractInt(photo.ResolutionUnit.ResolutionUnit.AdditionalData))
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.Humanize()
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: string.Empty;
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PhotoDigitalZoomRatio = photo.DigitalZoom != null ? $"{photo.DigitalZoom}x" : string.Empty;
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PhotoExifVersion = photo.ExifVersion ?? string.Empty;
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PhotoSoftwareUsed = photo.Software ?? string.Empty;
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PhotoUploadDate = photo.UploadDate.HasValue
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? photo.UploadDate.Value.ToString("MMMM d, yyyy 'at' HH:mm")
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: string.Empty;
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PhotoSource = photo.Source ?? string.Empty;
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// Load the full photo image
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await LoadPhotoImageAsync(photoId);
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IsLoading = false;
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}
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catch(Exception ex)
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{
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_logger.LogError(ex, "Error loading photo details for {PhotoId}", photoId);
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ErrorOccurred = true;
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ErrorMessage = ex.Message;
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IsLoading = false;
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}
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}
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/// <summary>
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/// Updates the portrait/landscape orientation flag
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/// </summary>
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public void UpdateOrientation(bool isPortrait)
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{
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IsPortrait = isPortrait;
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}
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private async Task LoadPhotoImageAsync(Guid photoId)
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{
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try
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{
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Stream stream = await _photoCache.GetPhotoAsync(photoId);
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var bitmap = new BitmapImage();
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using(IRandomAccessStream randomStream = stream.AsRandomAccessStream())
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{
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await bitmap.SetSourceAsync(randomStream);
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}
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PhotoImageSource = bitmap;
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}
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catch(Exception ex)
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{
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_logger.LogError(ex, "Error loading photo image {PhotoId}", photoId);
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ErrorOccurred = true;
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ErrorMessage = "Failed to load photo image";
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}
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}
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/// <summary>
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/// Extracts an integer value from AdditionalData dictionary
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/// </summary>
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private int ExtractInt(IDictionary<string, object> additionalData)
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{
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if(additionalData == null || additionalData.Count == 0) return 0;
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object? value = additionalData.Values.FirstOrDefault();
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if(value is int intValue) return intValue;
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if(value is double dblValue) return (int)dblValue;
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if(int.TryParse(value?.ToString() ?? "", out int parsed)) return parsed;
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return 0;
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}
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/// <summary>
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/// Humanizes an enum value extracted from AdditionalData
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/// </summary>
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private string ExtractAndHumanizeEnum(IDictionary<string, object>? additionalData, Type enumType)
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{
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if(additionalData == null || additionalData.Count == 0) return string.Empty;
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int intValue = ExtractInt(additionalData);
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if(intValue == 0 && enumType != typeof(ExposureMode)) return string.Empty;
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var enumValue = Enum.ToObject(enumType, intValue);
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return ((Enum)enumValue).Humanize();
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}
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}
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Reference in New Issue
Block a user