using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Xtremegaida.DataStructures;

namespace MediaContainers;

public sealed class EBMLDocumentWriter : IDisposable, IAsyncDisposable
{
	private readonly EBMLWriter writer;

	public EBMLHeader Header { get; private set; }
	public EBMLWriter Writer => writer;

	private EBMLDocumentWriter(EBMLWriter writer, EBMLHeader header)
	{
		this.writer = writer;
		Header = header;
	}

	public bool CanBeWrittenBy(EBMLDocType type)
	{
		return type.CanWriteDocument(Header);
	}

	public static async ValueTask<EBMLDocumentWriter> Write(EBMLHeader header, IDataQueueWriter writer, bool keepWriterOpen = false,
	   DataBufferCache cache = null, CancellationToken cancellationToken = default)
	{
		var ebml = new EBMLWriter(writer, keepWriterOpen, cache);
		await header.Write(ebml, cancellationToken);
		return new EBMLDocumentWriter(ebml, header);
	}

	public static async ValueTask<EBMLDocumentWriter> Write(EBMLHeader header, Stream stream, bool keepStreamOpen = false,
	   DataBufferCache cache = null, CancellationToken cancellationToken = default)
	{
		var ebml = new EBMLWriter(stream, keepStreamOpen, cache);
		await header.Write(ebml, cancellationToken);
		return new EBMLDocumentWriter(ebml, header);
	}

	public ValueTask DisposeAsync()
	{
		return writer.DisposeAsync();
	}

	public void Dispose()
	{
		writer.Dispose();
	}
}