using System;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Threading;

using FrostFS.SDK.Cryptography;

using Google.Protobuf;

using Grpc.Core.Interceptors;

namespace FrostFS.SDK.ClientV2;

public class Context()
{
    private List<Interceptor>? interceptors;

    private ByteString? publicKeyCache;

    public ECDsa Key { get; set; }

    public FrostFsOwner OwnerId { get; set; }

    public FrostFsVersion Version { get; set; }

    public CancellationToken CancellationToken { get; set; } = default;
    
    public TimeSpan Timeout { get; set; } = default;
    
    public DateTime? Deadline => Timeout.Ticks > 0 ? DateTime.UtcNow.Add(Timeout) : null;

    public Action<CallStatistics>? Callback { get; set; }

    public List<Interceptor> Interceptors
    {
        get { return this.interceptors ??= []; }
        set { this.interceptors = value; }
    }

    public ByteString? GetPublicKeyCache()
    { 
        if (publicKeyCache == null && Key != null)
        {
            publicKeyCache = ByteString.CopyFrom(Key.PublicKey());
        }

        return publicKeyCache;
    }
}