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using CoCoL;
using Duplicati.Library.Main.Volumes;
using Duplicati.Library.Utility;

namespace Duplicati.Library.Main.Operation.Restore
{

    /// <summary>
    /// Named channels for the restore operation.
    /// </summary>
    internal class Channels(Options options)
    {
        /// <summary>
        /// Channel between <see cref="FileLister"/> and <see cref="FileProcessor"/>.
        /// </summary>
        public readonly IChannel<FileRequest> FilesToRestore = ChannelManager.CreateChannel<FileRequest>(buffersize: 0 /* CoCoL deadlocks on retire if this is not zero */);

        /// <summary>
        /// Channel between <see cref="VolumeManager"/> and <see cref="VolumeDownloader"/>.
        /// </summary>
        public readonly IChannel<long> DownloadRequest = ChannelManager.CreateChannel<long>(buffersize: options.RestoreChannelBufferSize);

        /// <summary>
        /// Channel between <see cref="VolumeDownloader"/> and <see cref="VolumeDecryptor"/>
        /// </summary>
        public readonly IChannel<(long, string, TempFile)> DecryptRequest = ChannelManager.CreateChannel<(long, string, TempFile)>(buffersize: options.RestoreChannelBufferSize);

        /// <summary>
        /// Channel between <see cref="BlockManager"/> and <see cref="VolumeManager"/> to keep track of volumes that are actively being read.
        ///
        /// Size is computed as '2 * options.RestoreChannelBufferSize + options.RestoreVolumeDecompressors + 1' to avoid deadlocks.
        /// </summary>
        public readonly IChannel<long> DecompressionAck = ChannelManager.CreateChannel<long>(buffersize: 2 * options.RestoreChannelBufferSize + options.RestoreVolumeDecompressors + 1);

        /// <summary>
        /// Channel between <see cref="VolumeManager"/> and <see cref="VolumeDecompressor"/>
        /// </summary>
        public readonly IChannel<(BlockRequest, VolumeWrapper)> DecompressionRequest = ChannelManager.CreateChannel<(BlockRequest, VolumeWrapper)>(buffersize: options.RestoreChannelBufferSize);

        /// <summary>
        /// Channel between <see cref="VolumeDecompressor"/> and <see cref="BlockManager"/> holding the decompressed blocks.
        /// </summary>
        public readonly IChannel<(BlockRequest, DataBlock)> DecompressedBlock = ChannelManager.CreateChannel<(BlockRequest, DataBlock)>(buffersize: options.RestoreChannelBufferSize);

        /// <summary>
        /// Channel between <see cref="VolumeManager"/> <see cref="VolumeDecryptor"/>, used for requesting and responding volumes to the manager.
        /// </summary>
        public readonly IChannel<object> VolumeResponse = ChannelManager.CreateChannel<object>(buffersize: options.RestoreChannelBufferSize);
        /// <summary>
        /// Channel between <see cref="VolumeManager"/> and <see cref="BlockManager"/>, used for requesting and responding volumes to the manager.
        /// </summary>
        public readonly IChannel<object> VolumeRequest = ChannelManager.CreateChannel<object>(buffersize: options.RestoreChannelBufferSize);
    }

}