using System;
using HN.Application;
using HN.Infrastructure.Identity;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;

namespace Website
{
  public sealed class HttpExecutingUserProvider : IExecutingUserProvider
  {
    private readonly IHttpContextAccessor _httpContextAccessor;
    private readonly UserManager<User> _userManager;

    public HttpExecutingUserProvider(IHttpContextAccessor httpContextAccessor, UserManager<User> userManager)
    {
      _httpContextAccessor = httpContextAccessor;
      _userManager = userManager;
    }

    public Guid GetCurrentUserId()
    {
      var uid = _userManager.GetUserId(_httpContextAccessor.HttpContext.User);

      if (!Guid.TryParse(uid, out Guid result))
      {
        throw new UserNotConnected();
      }

      return result;
    }
  }
}