using InABox.Clients;
using InABox.Core;
using InABox.Rpc;
using PRSServices;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PRSServer;

internal class WebSocketDatabaseProxyEngine : DatabaseProxyEngine<WebSocketDatabaseProxyProperties>
{
    private RpcSocketProxyServer ProxyServer;

    private CertificateManager CertificateManager;

    protected override void RunProxy()
    {
        Logger.Send(LogType.Information, "", "Starting Listener on port " + Properties.ListenPort);

        CertificateManager = new CertificateManager(CertificateFileName());
        CertificateManager.UpdateCertificate += CertificateManager_UpdateCertificate;
        CertificateManager.CertificateExpiring += CertificateManager_CertificateExpiring;
        CertificateManager.CertificateExpired += CertificateManager_CertificateExpired;

        try
        {
            var certificate = CertificateManager.GetCertificate();

            ProxyServer = new RpcSocketProxyServer(Properties.ListenPort, ServerTransport, certificate);
            ProxyServer.Start();
        }
        catch (Exception eListen)
        {
            Logger.Send(LogType.Error, ClientFactory.UserID, eListen.Message);
        }
    }

    private void CertificateManager_CertificateExpired()
    {
        Logger.Send(LogType.Information, "", "Expiry of certificate reached; restarting HTTPS listener...");
        ProxyServer.Stop();
        ProxyServer = new RpcSocketProxyServer(Properties.ListenPort, ServerTransport, CertificateManager.GetCertificate());
        ProxyServer.Start();
    }

    private void CertificateManager_CertificateExpiring(DateTime expiry)
    {
        var message = expiry.Date == DateTime.Now.Date 
            ? $"HTTPS Certificate for Database Engine will expire today at {expiry.TimeOfDay:hh\\:mm}" 
            : $"HTTPS Certificate for Database Engine will expire in {(expiry - DateTime.Now).Days} at {expiry:dd/MM/yyyy hh:mm}";
        
        Logger.Send(LogType.Information, "DATABASE", message);
    }

    private void CertificateManager_UpdateCertificate(System.Security.Cryptography.X509Certificates.X509Certificate2 certificate)
    {
        Logger.Send(LogType.Information, "DATABASE", "HTTPS Certificate with greater expiry date found; restarting HTTPS listener...");

        ProxyServer.Stop();
        ProxyServer = new RpcSocketProxyServer(Properties.ListenPort, ServerTransport, certificate);
        ProxyServer.Start();
    }

    private string CertificateFileName() =>
        !string.IsNullOrWhiteSpace(Properties.CertificateFile)
        ? Properties.CertificateFile
        : CertificateEngine.CertificateFile;

    public override void Stop()
    {
        ProxyServer.Stop();
    }
}