using System.Net.Http;
using System.Threading.Tasks;
using Grpc.Net.Client;
using Grpc.Net.Client.Web;
using Protocol;
using Utils;

namespace Network
{
    public class GrpcClient : Singleton<GrpcClient>
    {
        // The address must adopt HTTP.
        private const string ServerAddress = "http://127.0.0.1:12345";

        private readonly GrpcChannel _channel;
        private readonly GameService.GameServiceClient _game;
        private readonly GeneralService.GeneralServiceClient _general;

        public GrpcClient()
        {
            var httpHandler = new GrpcWebHandler(GrpcWebMode.GrpcWeb, new HttpClientHandler());
            var channelOptions = new GrpcChannelOptions
            {
                HttpHandler = httpHandler
            };

            _channel = GrpcChannel.ForAddress(ServerAddress, channelOptions);

            _general = new GeneralService.GeneralServiceClient(_channel);
            _game = new GameService.GameServiceClient(_channel);
        }

        ~GrpcClient()
        {
            _channel.ShutdownAsync().Wait();
        }

        public async Task<ServerInfo> GetServerInfo()
        {
            return await _general.GetServerInfoAsync(new Empty());
        }

        public async Task<LoginResponse> Login(string username, string password)
        {
            return await _game.LoginAsync(new LoginRequest { Username = username, Password = password });
        }
    }
}