using Microsoft.AspNetCore.SignalR.Client;

namespace AyCode.Services.SignalRs;

/// <summary>
/// Extension methods for applying <see cref="AcHubConnectionOptions"/> to
/// a client <see cref="IHubConnectionBuilder"/>.
/// </summary>
public static class AcSignalRConnectionExtensions
{
    /// <summary>
    /// Applies <see cref="AcHubConnectionOptions"/> to the builder:
    /// <c>WithUrl</c> (with HttpConnectionOptions), keep-alive, server timeout,
    /// <c>WithAutomaticReconnect</c>, <c>WithStatefulReconnect</c>.
    /// <para>
    /// Nullable properties are skipped when <c>null</c> — the underlying SignalR default is kept.
    /// Combine freely with any other builder extensions before or after this call; the ordering
    /// follows the fluent chain (last write wins for a given setting).
    /// </para>
    /// </summary>
    public static IHubConnectionBuilder AddAcConnection(
        this IHubConnectionBuilder builder,
        AcHubConnectionOptions options)
    {
        if (options is null) throw new ArgumentNullException(nameof(options));
        if (string.IsNullOrWhiteSpace(options.Url))
            throw new ArgumentException("AcHubConnectionOptions.Url must be set.", nameof(options));

        builder.WithUrl(options.Url, http =>
        {
            if (options.Transports.HasValue) http.Transports = options.Transports.Value;
            if (options.TransportMaxBufferSize.HasValue) http.TransportMaxBufferSize = options.TransportMaxBufferSize.Value;
            if (options.ApplicationMaxBufferSize.HasValue) http.ApplicationMaxBufferSize = options.ApplicationMaxBufferSize.Value;
            if (options.CloseTimeout.HasValue) http.CloseTimeout = options.CloseTimeout.Value;
            if (options.SkipNegotiation.HasValue) http.SkipNegotiation = options.SkipNegotiation.Value;
        });

        if (options.KeepAliveInterval.HasValue)
            builder.WithKeepAliveInterval(options.KeepAliveInterval.Value);
        if (options.ServerTimeout.HasValue)
            builder.WithServerTimeout(options.ServerTimeout.Value);
        if (options.UseAutomaticReconnect)
            builder.WithAutomaticReconnect();
        if (options.UseStatefulReconnect)
            builder.WithStatefulReconnect();

        return builder;
    }
}