using ChatRoomContract;
using Microsoft.AspNetCore.Server.Kestrel.Core;
using Microsoft.Extensions.Logging;
using SimpleRpc.Serialization.Hyperion;
using SimpleRpc.Transports;
using SimpleRpc.Transports.Http.Client;
using System.Diagnostics;
using System.Net;
using NLog;

namespace GrpcToSimpleRPCAdapter;

public class Server
{
    public static void Main(string[] args)
    {
        var self = new Server();
        self.Run(args);
    }

    /// <summary>
	/// Logger for this class.
	/// </summary>
	Logger log = LogManager.GetCurrentClassLogger();

    /// <summary>
    /// Configures logging subsystem.
    /// </summary>
    private void ConfigureLogging()
    {
        var config = new NLog.Config.LoggingConfiguration();

        var console =
            new NLog.Targets.ConsoleTarget("console")
            {
                Layout = @"${date:format=HH\:mm\:ss}|${level}| ${message} ${exception}"
            };
        config.AddTarget(console);
        config.AddRuleForAllLevels(console);

        LogManager.Configuration = config;
    }

    /// <summary>
	/// Program body.
	/// </summary>
	/// <param name="args">Command line arguments.</param>
	private void Run(string[] args)
    {
        //configure logging
        ConfigureLogging();

        //indicate server is about to start
        log.Info("Server is about to start");

        //start the server
        StartServer(args);
    }

    public IChatRoomService getSimpleRPCService()
    {
        //connect to the server, get service client proxy
        var sc = new ServiceCollection();
        sc
            .AddSimpleRpcClient(
                "chatRoomService", //must be same as on line 86
                new HttpClientTransportOptions
                {
                    Url = "http://127.0.0.1:5000/simplerpc",
                    Serializer = "HyperionMessageSerializer"
                }
            )
            .AddSimpleRpcHyperionSerializer();

        sc.AddSimpleRpcProxy<IChatRoomService>("chatRoomService"); //must be same as on line 77

        var sp = sc.BuildServiceProvider();

        var chatRoom = sp.GetService<IChatRoomService>();
        Debug.Assert(chatRoom != null);

        return chatRoom;
    }

    /// <summary>
	/// Starts integrated server.
	/// </summary>
	/// <param name="args">Command line arguments.</param>
	private void StartServer(string[] args)
    {
        //create web app builder
        var builder = WebApplication.CreateBuilder(args);

        //configure integrated server
        builder.WebHost.ConfigureKestrel(opts => {
            opts.Listen(IPAddress.Loopback, 5002, opts =>
            {
                opts.Protocols = HttpProtocols.Http2;
            });
        });

        //add support for GRPC services
        builder.Services.AddGrpc();

        //add the actual services
        builder.Services.AddSingleton(getSimpleRPCService());

        //build the server
        var app = builder.Build();

        //turn on request routing
        app.UseRouting();

        //configure routes
        app.MapGrpcService<ChatRoomService>();

        //run the server
        app.Run();
        // app.RunAsync(); //use this if you need to implement background processing in the main thread
    }
}