AD_MAUI/AMC.ViewModel/ViewModels/AlbumViewModel.cs

using AMC.Model.Models;
using System.Collections.ObjectModel;
using System.ComponentModel;

namespace AMC.ViewModel.ViewModels
{
    public class AlbumViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler? PropertyChanged;

        private readonly Album album = new();

        public int Id => album.Id;

        public string Title => album.Title;

        public string Artist => album.Artist;

        public string CoverImage => album.CoverImage;

        public (string Genre, int Year) Details => (album.Genre, album.Year);

        public DateTime ReleaseDate => album.ReleaseDate;

        public (int SongCount, int TotalDuration) SongsInfo
            => (album.Songs.Count, album.Songs.Sum(song => song.Duration) / 60);

        public (int CopyrightYear, string ProducerBlurb) CopyrightInfo
            => (album.CopyrightYear, album.ProducerBlurb);

        public ReadOnlyObservableCollection<SongViewModel> Songs => new(songs);

        private readonly ObservableCollection<SongViewModel> songs;


        public AlbumViewModel(Album? album)
        {
            // Mocked data for testing
            this.album = album ?? new Album
            {
                Id = 1,
                Title = "Test Album",
                Artist = "Test Artist",
                CoverImage = "macroblank.png",
                Genre = "Test genre",
                Year = 1970,
                ReleaseDate = new DateTime(1970, 01, 01),
                CopyrightYear = 1996,
                ProducerBlurb = "Test Records Ltd",
                Songs = new List<Song>
                {
                    new Song { Id = 1, Title = "Test Song 1", Duration = 210 },
                    new Song { Id = 2, Title = "Test Song 2", Duration = 260 },
                    new Song { Id = 3, Title = "Test Soooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong 3", Duration = 817 },
                    new Song { Id = 4, Title = "Test Song 4", Duration = 654 },
                    new Song { Id = 5, Title = "Test Song 5", Duration = 768 },
                    new Song { Id = 6, Title = "Test Song 6", Duration = 435 },
                    new Song { Id = 7, Title = "Test Song 7", Duration = 864 },
                    new Song { Id = 8, Title = "Test Song 8", Duration = 456 },
                    new Song { Id = 9, Title = "Test Song 9", Duration = 83 },
                    new Song { Id = 10, Title = "Test Song 10", Duration = 4533 },
                    new Song { Id = 11, Title = "Test Song 11", Duration = 785 },
                    new Song { Id = 12, Title = "Test Song 12", Duration = 712 },
                    new Song { Id = 13, Title = "Test Song 13", Duration = 523 },
                }
            };

            int index = 1;
            foreach (var song in this.album.Songs)
            {
                song.Index = index++;
            }

            songs = new ObservableCollection<SongViewModel>(this.album.Songs.Select(song => new SongViewModel(song)));
        }
    }
}