using FinalFactory.Rendezvous.Server.Provisioning;
using FinalFactory.Rendezvous.Server.State;
using FinalFactory.Rendezvous.Server.Transport;
using Microsoft.Extensions.Options;

namespace FinalFactory.Rendezvous.Server.Observability;

internal sealed class RendezvousReadiness(
    UdpMediatorService mediator,
    ProvisioningReadiness provisioning,
    IEphemeralRendezvousStore state,
    IOptions<UdpMediatorOptions> udpOptions)
{
    public ReadinessSnapshot GetSnapshot()
    {
        bool ipv6Required = !string.IsNullOrWhiteSpace(udpOptions.Value.Ipv6ListenAddress);
        return new ReadinessSnapshot(
            HttpListenerReady: true,
            UdpIpv4ListenerReady: mediator.LocalEndpoint is not null,
            UdpIpv6ListenerReady: !ipv6Required || mediator.LocalIpv6Endpoint is not null,
            ProvisioningReady: provisioning.IsReady,
            StoreAvailable: state.IsAvailable,
            Draining: state.IsDraining);
    }
}

internal sealed record ReadinessSnapshot(
    bool HttpListenerReady,
    bool UdpIpv4ListenerReady,
    bool UdpIpv6ListenerReady,
    bool ProvisioningReady,
    bool StoreAvailable,
    bool Draining)
{
    public bool IsReady => HttpListenerReady
        && UdpIpv4ListenerReady
        && UdpIpv6ListenerReady
        && ProvisioningReady
        && StoreAvailable
        && !Draining;
}