using System;
using System.Threading;
using Google.Protobuf.WellKnownTypes;
using MxGateway.Contracts.Proto;

namespace MxGateway.Worker.Sta;

public sealed class StaCommand
{
    public StaCommand(
        string sessionId,
        string correlationId,
        MxCommand command,
        Timestamp? enqueueTimestamp = null,
        CancellationToken cancellationToken = default)
    {
        if (string.IsNullOrWhiteSpace(sessionId))
        {
            throw new ArgumentException("STA command requires a session id.", nameof(sessionId));
        }

        if (string.IsNullOrWhiteSpace(correlationId))
        {
            throw new ArgumentException("STA command requires a correlation id.", nameof(correlationId));
        }

        SessionId = sessionId;
        CorrelationId = correlationId;
        Command = command ?? throw new ArgumentNullException(nameof(command));
        EnqueueTimestamp = enqueueTimestamp ?? Timestamp.FromDateTime(DateTime.UtcNow);
        CancellationToken = cancellationToken;
    }

    public string SessionId { get; }

    public string CorrelationId { get; }

    public MxCommand Command { get; }

    public Timestamp EnqueueTimestamp { get; }

    public CancellationToken CancellationToken { get; }

    public MxCommandKind Kind => Command.Kind;

    public string MethodName => Kind.ToString();
}