using System.Security.Cryptography;
using System.Text;
using PCC.App.Security;
using PCC.App.Tpm;
using PCC.Common.AssemblyInject.Interfaces;
using PCC.Common.EventBus;
using PCC.DevShared.Configuration;

namespace PCC.DevServer;

internal class DevServerApp(
    PccDevConfigManagerBase configManager,
    IPeerInfoProvider peerInfoProvider,
    TrustedPeerManager tpm,
    IEventBus eventBus,
    ILogger<DevServerApp> logger) : IAssemblyInjectSyncInitStarStop
{
    private ILocalPeerInfo? _local;
    private IRemotePeerInfo? _remote;

    public void Init()
    {
        logger.LogInformation("init");

        eventBus.Subscript<TPM_EVT_LISTENER_STATUS_CHANGED>(OnListenerStatusChanged);
        eventBus.Subscript<TPM_EVT_INBOUND_CON_ACCEPTED>(OnInboundAccepted);
        eventBus.Subscript<TPM_EVT_INBOUND_CON_STATUS_CHANGED>(OnInboundStatusChanged);
        eventBus.Subscript<TPM_EVT_INBOUND_CON_ERROR>(OnInboundConnectionError);
        eventBus.Subscript<TPM_EVT_INBOUND_RX>(OnInboundRx);
        eventBus.Subscript<TPM_EVT_INBOUND_TX>(OnInboundTx);
    }

    public void Start()
    {
        logger.LogInformation("starting...");

        if (configManager.Instance.MyKeyPrivate == null || configManager.Instance.MyKeyPublic == null)
        {
            logger.LogInformation("Generating 8192bit RSA key... be patient, may take up to 30 seconds...");
            var (myPub, myPri) = RsaUtility.GeneratePKCS1(8192);
            configManager.Instance.MyKeyPrivate = Convert.ToBase64String(myPri, Base64FormattingOptions.None);
            configManager.Instance.MyKeyPublic = Convert.ToBase64String(myPub, Base64FormattingOptions.None);
            configManager.Save();
            logger.LogInformation("RSA key generated and saved. Please fill conf and RESTART.");
        }


        _local = peerInfoProvider.PeerInfo.FirstOrDefault();
        if (_local != null)
        {
            _remote = _local.TrustedRemotePeers.FirstOrDefault();

        }
    }

    private void OnInboundTx(TPM_EVT_INBOUND_TX obj)
    {
        logger.LogInformation($"IB Tx L{obj.LocalPeerId} R{obj.RemotePeerId} {Encoding.UTF8.GetString(obj.payload.Span)}");

    }

    private void OnInboundRx(TPM_EVT_INBOUND_RX obj)
    {
        logger.LogInformation($"IB Rx L{obj.LocalPeerId} R{obj.RemotePeerId} {Encoding.UTF8.GetString(obj.payload.Span)}");

        tpm.SendToPeer(_local.PeerId, obj.RemotePeerId, SHA256.HashData(obj.payload.Span));
    }

    private void OnInboundConnectionError(TPM_EVT_INBOUND_CON_ERROR obj)
    {
        logger.LogError(obj.Exception, $"IB ERR L{obj.LocalPeerId} R{obj.RemotePeerId} C{obj.ConnectionId}");
    }

    private void OnInboundStatusChanged(TPM_EVT_INBOUND_CON_STATUS_CHANGED obj)
    {
        switch (obj.Status)
        {
            case TPM_EVT_INBOUND_CON_STATUS.HANDSHAKE_FAIL_NOT_TRUSTED:
            case TPM_EVT_INBOUND_CON_STATUS.SECURE_ALERT_REPLAY_ATTACK_DETECT:
                logger.LogError($"IB ST {obj.Status} L{obj.LocalPeerId} R{obj.RemotePeerId} C{obj.ConnectionId}");
                break;

            default:
            case TPM_EVT_INBOUND_CON_STATUS.INVALID:
            case TPM_EVT_INBOUND_CON_STATUS.SECURE_WARN_TIMESTAMP_SKEW:
                logger.LogWarning($"IB ST {obj.Status} L{obj.LocalPeerId} R{obj.RemotePeerId} C{obj.ConnectionId}");
                break;

            case TPM_EVT_INBOUND_CON_STATUS.HANDSHAKE_OK:
            case TPM_EVT_INBOUND_CON_STATUS.DISCONNECTED:
                logger.LogInformation($"IB ST {obj.Status} L{obj.LocalPeerId} R{obj.RemotePeerId} C{obj.ConnectionId}");
                break;
        }
    }

    private void OnInboundAccepted(TPM_EVT_INBOUND_CON_ACCEPTED obj)
    {
        logger.LogInformation($"Inbound accepted {obj.RemoteEndpoint} {obj.ConnectionId}");
    }

    private void OnListenerStatusChanged(TPM_EVT_LISTENER_STATUS_CHANGED obj)
    {
        logger.LogInformation($"Listener {obj.Status} {obj.Exception?.Message}");
    }

    public void Stop()
    {
    }
}