using System.Reactive.Linq;
using InnovEnergy.Lib.Devices.IEM3kGridMeter;
using InnovEnergy.Lib.Protocols.DBus;
using InnovEnergy.Lib.Protocols.Modbus.Clients;
using InnovEnergy.Lib.Utils;
using InnovEnergy.Lib.Victron.VeDBus;

namespace InnovEnergy.App.SchneiderDriver;

public static class SchneiderMeterDriver
{
    
    public static Task<Exception> Run(String hostName, Bus dbusAddress)
    {
        return Run(hostName, ModbusTcpClient.DefaultPort, dbusAddress);
    }
    
    public static async Task<Exception> Run(String hostName, UInt16 port, Bus dbusAddress)
    {
        // var ep = new UnixDomainSocketEndPoint("/home/eef/graber_dbus.sock");
        // var auth = AuthenticationMethod.ExternalAsRoot();
        // dbusAddress = new Bus(ep, auth);

        var schneider = new Iem3KGridMeterDevice(hostName, port, Config.ModbusNodeId);

       
        var schneiderStatus = Observable
                             .Interval(Config.UpdatePeriod)
                             .Select(_ => schneider.Read())
                             .Where(reading => reading != null)
                             .Publish();

        var poller = schneiderStatus.Connect();

        var properties = Config.DefaultProperties;
            
        var signals = Config
            .Signals
            .Select(signal => schneiderStatus
                .Select(reading =>
                {
                    var property = signal.ToVeProperty(reading);
                    if (property == null)
                    {
                       // Console.WriteLine($"Warning: Signal {signal} produced a null property.");
                    }
                    else
                    {
                        //Console.WriteLine($"Transformed Signal to Property: {property}");
                    }
                    return property;
                })
                .Where(property => property != null))
                .Merge()
                .Do(p =>
                {
                  //  Console.WriteLine($"Setting property: {p}");
                    properties.Set(p);
                });
        
             // TODO: remove when possible
        // Apparently some VE services need to be periodically reminded that
        // this service is /Connected
        Console.WriteLine("Goes to subscribe");
        schneiderStatus.Subscribe(_ => properties.Set("/Connected", 1));
        Console.WriteLine("Subscribed successfully");
        // Wait until status is read once to make sure all
        // properties are set when we go onto the bus.
        
        var dbus = schneiderStatus
                   .Skip(1)
                   .Take(1)
                   .SelectMany(_ => PublishPropertiesOnDBus(properties, dbusAddress));

         return await signals
                      .MergeErrors(dbus)
                      .Finally(poller.Dispose)
                      .SelectErrors();
    }

    
    private static Task<Exception> PublishPropertiesOnDBus(VeProperties properties, Bus bus)
    {
        Console.WriteLine($"Connecting to DBus {bus}");
        return properties.PublishOnDBus(bus, Config.BusName);
    }
}