using FileTime.Core.ContentAccess;
using FileTime.Core.Models;
using FileTime.Core.Timeline;
using SharpCompress.Archives;

namespace FileTime.Tools.Compression.ContentProvider;

public sealed class CompressedContentProvider : SubContentProviderBase, ICompressedContentProvider
{
    public CompressedContentProvider(
        ITimelessContentProvider timelessContentProvider,
        IContentAccessorFactory contentAccessorFactory,
        IContentProvider parentContentProvider
    )
        : base(
            timelessContentProvider,
            contentAccessorFactory,
            parentContentProvider,
            "compression")
    {
    }

    public override async Task<byte[]?> GetContentAsync(IElement element, int? maxLength = null, CancellationToken cancellationToken = default)
    {
        var parentElementContext = await GetParentElementReaderAsync(element);
        var reader = parentElementContext.ContentReader;
        var subPath = parentElementContext.SubNativePath.Path;
        
        await using var readerStream = reader.AsStream();
        using var archive = ArchiveFactory.Open(readerStream);
        
        var entry = archive.Entries.First(e => e.Key == subPath);
        await using var contentReader= entry.OpenEntryStream();
        
        var data = new byte[1024 * 1024];
        var readAsync = await contentReader.ReadAsync(data, cancellationToken);

        return data[..readAsync].ToArray();
    }

    public override VolumeSizeInfo? GetVolumeSizeInfo(FullName path) => throw new NotImplementedException();
}