CardHybridSession.cs

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using System.Diagnostics;
using Codemaru.Models;
using Codemaru.States;
 
namespace Codemaru.Services;

public sealed class CardHybridSession
{
    private readonly object _sync = new();
    private readonly IQrSvgGenerator _qr;

    private CardHybridState? _state;

    public CardHybridSession(IQrSvgGenerator qr, ICardProfileStore _)
    {
        _qr = qr ?? throw new ArgumentNullException(nameof(qr));
    }

    public CardHybridState State =>
        _state ?? CardHybridState.CreateDefault(_qr.CreateSvg(CardProfile.Default.LandingUrl));

    public CardHybridUser CurrentUser => CardHybridUser.Guest;

    public event EventHandler<CardHybridState>? StateChanged;

    public Task InitializeAsync(CancellationToken cancellationToken = default)
    {
        lock (_sync)
        {
            if (_state is not null)
            {
                return Task.CompletedTask;
            }
 
            _state = CardHybridState.CreateDefault(_qr.CreateSvg(CardProfile.Default.LandingUrl));
        }
 
        NotifyStateChanged();
        return Task.CompletedTask;
    }

    private void NotifyStateChanged()
    {
        var handlers = StateChanged?.GetInvocationList();
        if (handlers is null)
        {
            return;
        }
 
        foreach (var handler in handlers)
        {
            try
            {
                ((EventHandler<CardHybridState>)handler).Invoke(this, State);
            }
            catch (Exception ex)
            {
                Debug.WriteLine($"CardHybrid state handler failed: {ex}");
            }
        }
    }
}