using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.SignalR.Client;
using Microsoft.Extensions.DependencyInjection;

namespace Squirrowse.Client.Service
{
    public class ConnectionManager : IConnectionManager
    {
        private readonly HubConnection _connection;
        private bool Connected;

        public ConnectionManager(string url, int port)
        {
            _connection = new HubConnectionBuilder()
                .WithUrl($"{url}:{port}/StreamHub")
                .AddMessagePackProtocol()
                .WithAutomaticReconnect()
                .Build();
        }

        public async Task<HubConnection> GetConnection()
        {
            if (Connected) return _connection;

            throw new Exception();
        }

        public async Task InitConnection()
        {
            if (_connection.State == HubConnectionState.Connected) return;
            await _connection.StartAsync();
            await RegisterOnHub();
            Connected = true;
        }

        public async Task Disconnect()
        {
            if (_connection.State == HubConnectionState.Disconnected) throw new Exception();
            await _connection.StopAsync();
            Connected = false;
        }

        private async Task RegisterOnHub()
        {
            await _connection.SendAsync("AddUser", Environment.UserName);
        }
    }
}