namespace LumaTunnel.Server.Core.Configuration;

public sealed record ServerSettings
{
    public string NodeId { get; init; } = Guid.NewGuid().ToString("N");
    public string NodeName { get; init; } = Environment.MachineName;
    public string[] BindingUrls { get; init; } = ["http://localhost:3300/"];
    public string PublicApiUrl { get; init; } = "http://localhost:3300/api";
    public string PublicTunnelUrl { get; init; } = "ws://localhost:3300/tunnel/v1";
    public int MaxConnections { get; init; } = 512;
    public int MaxConnectionsPerDevice { get; init; } = 128;
    public int MaxBufferedFramesPerStream { get; init; } = 32;
    public int ConnectTimeoutSeconds { get; init; } = 10;
    public int IdleTimeoutMinutes { get; init; } = 15;
    public bool AllowPrivateTargets { get; init; }
    public int[] BlockedPorts { get; init; } = [25];
    public int ApiRequestsPerMinutePerIp { get; init; } = 120;

    public void Validate()
    {
        if (string.IsNullOrWhiteSpace(NodeId))
            throw new InvalidOperationException("NodeId is required.");
        if (string.IsNullOrWhiteSpace(NodeName))
            throw new InvalidOperationException("NodeName is required.");
        if (BindingUrls.Length == 0 || BindingUrls.Any(url => !Uri.TryCreate(url, UriKind.Absolute, out _)))
            throw new InvalidOperationException("At least one valid absolute binding URL is required.");
        if (!Uri.TryCreate(PublicApiUrl, UriKind.Absolute, out _))
            throw new InvalidOperationException("PublicApiUrl must be an absolute URI.");
        if (!Uri.TryCreate(PublicTunnelUrl, UriKind.Absolute, out var tunnelUri) || tunnelUri.Scheme is not ("ws" or "wss"))
            throw new InvalidOperationException("PublicTunnelUrl must use ws or wss.");
        if (MaxConnections <= 0 || MaxConnectionsPerDevice <= 0 || MaxConnectionsPerDevice > MaxConnections)
            throw new InvalidOperationException("Connection limits are invalid.");
        if (ConnectTimeoutSeconds is < 1 or > 120)
            throw new InvalidOperationException("ConnectTimeoutSeconds must be between 1 and 120.");
    }
}