wabbajack/Wabbajack/View Models/ModListVM.cs

118 lines
4.5 KiB
C#

using ReactiveUI;
using System;
using System.IO;
using System.IO.Compression;
using System.Reactive;
using System.Reactive.Linq;
using System.Windows.Media.Imaging;
using Wabbajack.Common;
using Wabbajack.Lib;
using Wabbajack.Lib.ModListRegistry;
namespace Wabbajack
{
public class ModListVM : ViewModel
{
public ModList SourceModList { get; private set; }
public ModlistMetadata SourceModListMetadata { get; private set; }
public Exception Error { get; }
public AbsolutePath ModListPath { get; }
public string Name => SourceModList?.Name;
public string Readme => SourceModList?.Readme;
public string Author => SourceModList?.Author;
public string Description => SourceModList?.Description;
public Uri Website => SourceModList?.Website;
public ModManager ModManager => SourceModList?.ModManager ?? ModManager.MO2;
public Version Version => SourceModList?.Version;
public Version WabbajackVersion => SourceModList?.WabbajackVersion;
public bool IsNSFW => SourceModList?.IsNSFW ?? false;
// Image isn't exposed as a direct property, but as an observable.
// This acts as a caching mechanism, as interested parties will trigger it to be created,
// and the cached image will automatically be released when the last interested party is gone.
public IObservable<BitmapImage> ImageObservable { get; }
public ModListVM(AbsolutePath modListPath)
{
ModListPath = modListPath;
try
{
SourceModList = AInstaller.LoadFromFile(modListPath);
var metadataPath = modListPath.WithExtension(Consts.ModlistMetadataExtension);
if (metadataPath.Exists)
{
try
{
SourceModListMetadata = metadataPath.FromJson<ModlistMetadata>();
}
catch (Exception)
{
SourceModListMetadata = null;
}
}
}
catch (Exception ex)
{
Error = ex;
Utils.Error(ex, "Exception while loading the modlist!");
}
ImageObservable = Observable.Return(Unit.Default)
// Download and retrieve bytes on background thread
.ObserveOn(RxApp.TaskpoolScheduler)
.SelectAsync(async filePath =>
{
try
{
await using var fs = await ModListPath.OpenShared();
using var ar = new ZipArchive(fs, ZipArchiveMode.Read);
var ms = new MemoryStream();
var entry = ar.GetEntry("modlist-image.png");
if (entry == null) return default(MemoryStream);
await using var e = entry.Open();
e.CopyTo(ms);
return ms;
}
catch (Exception ex)
{
Utils.Error(ex, $"Exception while caching Mod List image {Name}");
return default(MemoryStream);
}
})
// Create Bitmap image on GUI thread
.ObserveOnGuiThread()
.Select(memStream =>
{
if (memStream == null) return default(BitmapImage);
try
{
return UIUtils.BitmapImageFromStream(memStream);
}
catch (Exception ex)
{
Utils.Error(ex, $"Exception while caching Mod List image {Name}");
return default(BitmapImage);
}
})
// If ever would return null, show WJ logo instead
.Select(x => x ?? ResourceLinks.WabbajackLogoNoText.Value)
.Replay(1)
.RefCount();
}
public void OpenReadme()
{
if (string.IsNullOrEmpty(Readme)) return;
Utils.OpenWebsite(new Uri(Readme));
}
public override void Dispose()
{
base.Dispose();
// Just drop reference explicitly, as it's large, so it can be GCed
// Even if someone is holding a stale reference to the VM
SourceModList = null;
}
}
}