using Fleet.Server;
using MoShiro.Backend.Application;
using MoShiro.Protocol;

namespace MoShiro.Backend.Gateway;

/// <summary>
/// RawChunk 收件箱（二进制通道 16）：持久化之后才返回，Fleet 随后才回复 ACK，按 chunk_id 去重。
/// 永远不可能被接受的块（损坏、冒名、未知 Kind）也确认掉并记录原因，否则节点会无限重发。
/// </summary>
public sealed class RawChunkInbox : IInbox
{
    private readonly IngestService _ingest;

    public RawChunkInbox(IngestService ingest)
    {
        _ingest = ingest;
    }

    public byte Channel => MoShiroChannels.RawChunk;

    public async ValueTask<InboxOutcome> HandleAsync(NodeRecord node, Guid msgId, ReadOnlyMemory<byte> payload, CancellationToken ct) =>
        await _ingest.IngestAsync(node.Id, msgId, payload, ct) switch
        {
            IngestOutcome.Stored => InboxOutcome.Stored,
            _ => InboxOutcome.Duplicate,
        };
}