using FinalFactory.Rendezvous.Contracts;

namespace FinalFactory.Rendezvous.Client;

public sealed class RendezvousConnectionStartResult
{
    internal RendezvousConnectionStartResult(
        CreateJoinAttemptResponse? attempt,
        RendezvousConnectionOutcome? outcome)
    {
        if ((attempt is null) == (outcome is null))
        {
            throw new ArgumentException(
                "A connection start result requires exactly one attempt or terminal outcome.");
        }

        Attempt = attempt;
        Outcome = outcome;
    }

    public CreateJoinAttemptResponse? Attempt { get; }
    public RendezvousConnectionOutcome? Outcome { get; }
    public bool IsReadyForTraversal => Attempt is not null;
    public bool IsCompleted => Outcome is not null;

    public static RendezvousConnectionStartResult ReadyForTraversal(
        CreateJoinAttemptResponse attempt) => new(
        attempt ?? throw new ArgumentNullException(nameof(attempt)),
        null);

    public static RendezvousConnectionStartResult Completed(
        RendezvousConnectionOutcome outcome) => new(
        null,
        outcome ?? throw new ArgumentNullException(nameof(outcome)));
}