using Core.Enumerations;
using ExtensionMethods;
using Extensions;
using Microsoft.AspNetCore.Authorization;
using WeatherForecast.Services;

namespace WeatherForecast.Policies {

  /// <summary>
  /// 
  /// </summary>
  public class CrudAuthorizationHandler : AuthorizationHandler<CrudActionRequirement> {

    private readonly IHttpContextAccessor _contextAccessor;
    private readonly IUserService _authenticationService;

    /// <summary>
    /// 
    /// </summary>
    /// <param name="contextAccessor"></param>
    /// <param name="authenticationService"></param>
    public CrudAuthorizationHandler(
      IHttpContextAccessor contextAccessor,
      IUserService authenticationService
    ) {
      _contextAccessor = contextAccessor;
      _authenticationService = authenticationService;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="context"></param>
    /// <param name="requirement"></param>
    /// <returns></returns>
    protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, CrudActionRequirement requirement) {

      var user = context.User;
      var identity = user.Identity;
      var name = identity?.Name;
      var userId = name?.ToNullableGuid();

      var request = _contextAccessor?.HttpContext?.Request;
      var bearerToken = request?.GeBearerToken();  

      if (_authenticationService.VerifyToken(userId, bearerToken, requirement.Controller, requirement.Action).IsSuccess)
          context.Succeed(requirement);

      return Task.CompletedTask;
    }
  }

  /// <summary>
  /// 
  /// </summary>
  public class CrudActionRequirement : IAuthorizationRequirement {

    /// <summary>
    /// 
    /// </summary>
    public WebapiControllers Controller { get; }

    /// <summary>
    /// 
    /// </summary>
    public CrudActions Action { get; }

    /// <summary>
    /// 
    /// </summary>
    public bool SameAuthor { get;  }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="crudAction"></param>
    public CrudActionRequirement(WebapiControllers controller, CrudActions crudAction, bool sameAuthor = false) {
      Controller = controller;
      Action = crudAction;
      SameAuthor = sameAuthor;
    }
  }
}