using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

namespace LeanCloud.Storage.Internal {
  public interface IAVAuthenticationProvider {
    /// <summary>
    /// Authenticates with the service.
    /// </summary>
    /// <param name="cancellationToken">The cancellation token.</param>
    Task<IDictionary<string, object>> AuthenticateAsync(CancellationToken cancellationToken);

    /// <summary>
    /// Deauthenticates (logs out) the user associated with this provider. This
    /// call may block.
    /// </summary>
    void Deauthenticate();

    /// <summary>
    /// Restores authentication that has been serialized, such as session keys,
    /// etc.
    /// </summary>
    /// <param name="authData">The auth data for the provider. This value may be null
    /// when unlinking an account.</param>
    /// <returns><c>true</c> iff the authData was successfully synchronized. A <c>false</c> return
    /// value indicates that the user should no longer be associated because of bad auth
    /// data.</returns>
    bool RestoreAuthentication(IDictionary<string, object> authData);

    /// <summary>
    /// Provides a unique name for the type of authentication the provider does.
    /// For example, the FacebookAuthenticationProvider would return "facebook".
    /// </summary>
    string AuthType { get; }
  }
}